Vehicle mounted multiphase converter

The present invention relates to a vehicle-mounted multiphase converter including a plurality of inductors and switching the current flowing through each inductor.

Hybrid vehicles, electric vehicles, and the like that travel by the driving force of a motor are widely used. Such a power-driven vehicle includes a battery that supplies driving power to the motor, and a boost converter that boosts the battery voltage and outputs the boosted voltage to the motor drive circuit.

The boost converter includes an inductor, a switching circuit for switching the current flowing through the inductor, and the like. The inductor generates an induced electromotive force by switching the current. The boost converter outputs a boost voltage obtained by adding an induced electromotive force to the input voltage to the motor drive circuit. As a result, the boost converter can output a voltage larger than the battery voltage to the motor drive circuit.

<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 8-308255</text></patcit></p>

<p> In recent years, a vehicle-mounted external charging device has been developed that charges a battery by supplying electric power to the battery from a commercial power outlet or other external power supply device. However, when an external charging device is mounted on a vehicle in addition to a battery, a boost converter, etc., there is a problem that the system becomes large.</p><p> Patent Document 1 discloses a device that performs external charging using a part of a vehicle-mounted inverter that performs DC-AC conversion. In this device, although a part of the inverter is used to form an external charging circuit, it is considered necessary to add a large reactor.</p><p> The present invention has been made for such a problem. That is, the purpose is to reduce the scale of the power supply device for mounting on a vehicle having an external charging function.</p>

<p> The present invention is an external power acquisition unit that acquires AC power from a power generation source provided separately from the vehicle in a vehicle-mounted multiphase converter including a plurality of inductors and a switching unit that switches current paths. In a boosted connection state in which one end of each inductor is connected to a path leading to a battery for supplying vehicle drive power and the other end of each inductor is connected to the switching unit, or one end of the plurality of inductors is connected to the switching unit. One of the charging connection states in which one end of the remaining inductor is connected to the path leading to the battery, one end of the remaining inductor is separated from the path leading to the battery and connected to the external power acquisition unit, and the other end of each inductor is connected to the switching unit. The connection state includes a switching means for switching the connection state of each inductor, the switching unit, and the external power acquisition unit, and the switching unit sets the connection state to the boosted connection state. A voltage based on the induced electromotive force generated in each inductor and the output voltage of the battery according to the current path switching is output from the vehicle-mounted multi-phase converter, and the switching means sets the connection state to the charging connection state. At times, the AC voltage output from the external power acquisition unit is converted into a DC voltage based on the current path switching, and the DC voltage is applied to the battery.</p><p> Further, the vehicle-mounted multi-phase converter according to the present invention includes a drive circuit that controls a drive motor of the mounted vehicle, and the switching means is generated in each inductor when the connection state is set to the step-up connection state. When the drive circuit is connected to the switching unit and the connection state is set to the charge connection state, the drive circuit is connected so that a voltage based on the induced electromotive force and the output voltage of the battery is output to the drive circuit. Is preferably separated from the switching section.</p><p> Further, according to the present invention, in a vehicle-mounted multi-phase converter including a plurality of inductors and a switching unit for switching current paths, external power for acquiring AC power from a power generation source provided separately from the mounted vehicle. A boosted connection state in which the acquisition unit and one end of each inductor are connected to the path leading to the vehicle drive power supply battery, and the other end of each inductor is connected to the switching unit, or one end of each inductor reaches the battery. switching from the path release is, the other end with connecting one of the end of the plurality of inductors to the external power acquisition unit connected to the first part of the switching unit, further, the front stage and rear stage of the switching unit Each inductor, the switching unit, and the external are in a charging connection state in which the remaining inductor is connected to the switching unit and the rear stage unit is connected to the path leading to the battery so that a magnetic coupling circuit for magnetically coupling the inductor is formed. The switching unit includes a switching means for switching the connection state of the power acquisition unit, and the switching unit includes an induced electromotive force generated in each inductor in response to current path switching when the switching means changes the connection state to the boosted connection state. And the output voltage of the battery, and when the switching means changes the connection state to the charging connection state, the AC voltage output from the external power acquisition unit is converted to a DC voltage based on the current path switching. It is preferable to convert the voltage into the above and apply the DC voltage to the battery from the latter stage portion.</p><p> Further, the vehicle-mounted multiphase converter according to the present invention is provided with a drive circuit connected to the rear stage portion to control the drive motor of the mounted vehicle, and when the switching means changes the connection state to the step-up connection state. It is preferable to output a voltage based on the induced electromotive force generated in each inductor and the output voltage of the battery from the switching unit to the drive circuit.</p>

<p> According to the present invention, in a power supply device for mounting on a vehicle having an external charging function, the scale of the device can be reduced.</p>

<figref num="1">It is a figure which shows the structure of the hybrid vehicle drive system which concerns on 1st Embodiment.</figref><figref num="2">It is a figure which shows the structural example of a switching element.</figref><figref num="3">It is a figure which shows the circuit structure of the three-phase multiphase converter in an external charge mode.</figref><figref num="4">It is a figure which shows the structure of the hybrid vehicle drive system which concerns on the application example of 1st Embodiment.</figref><figref num="5">It is a figure which shows the circuit structure of the 4-phase multiphase converter which concerns on the application example in an external charge mode.</figref><figref num="6">It is a figure which shows the structure of the hybrid vehicle drive system which concerns on 1st Embodiment.</figref><figref num="7">It is a figure which shows the circuit structure of the 6-phase multi-phase converter in an external charge mode.</figref><figref num="8">It is a figure which shows the structure of the hybrid vehicle drive system which concerns on application example of 2nd Embodiment.</figref><figref num="9">It is a figure which shows the circuit structure of the 7-phase multi-phase converter which concerns on the application example in an external charge mode.</figref>

FIG. 1 shows the configuration of the hybrid vehicle drive system 10 according to the first embodiment of the present invention. The hybrid vehicle drive system 10 includes a switchable three-phase multiphase converter 12. The switchable three-phase multi-phase converter 12 charges the battery 14 for supplying vehicle drive power based on the electric power acquired from an external power supply such as a commercial power source, or boosts the output voltage of the battery 14 to the drive circuit 20. Output. It also includes a drive circuit 20 that performs DC-AC conversion between the switchable 3-phase multi-phase converter 12 and the drive motor 22 and the power generation motor 24 to transfer electric power, and the drive motor 22 and the power generation motor 24.

The switchable three-phase multi-phase converter 12 has a configuration in which an inductor is connected to a connection node of switching elements connected vertically. The switchable three-phase multi-phase converter 12 operates in either a step-up mode in which the output voltage of the battery 14 is boosted or an external charging mode in which the battery 14 is charged based on the power acquired from the external power supply device.

Input capacitors 16 are connected in parallel to both ends of the battery 14. One end of the relay switch RS1, one end of the relay switch RS2, and one end of the inductor L3 are connected to the positive electrode of the battery 14.

One ends of inductors L1 and L2 are connected to the other ends of the relay switches RS1 and RS2, respectively. The other end of the inductor L1 is connected to the connection nodes of the switching elements S1 and S2, and the other end of the inductor L2 is connected to the connection nodes of the switching elements S3 and S4. The other end of the inductor L3 is connected to the connection nodes of the switching elements S5 and S6.

One end of the switching element S1 opposite to the switching element S2 side, one end of the switching element S3 opposite to the switching element S4 side, and one end of the switching element S5 opposite to the switching element S6 side are relay switches RS3. It is commonly connected to one end of. The other end of the relay switch RS3 is connected to the drive circuit 20.

One end of the switching element S2 opposite to the switching element S1 side, one end of the switching element S4 opposite to the switching element S3 side, and one end of the switching element S6 opposite to the switching element S5 side of the battery 14 Commonly connected to the negative electrode and one end of the relay switch RS4. The other end of the relay switch RS4 is connected to the drive circuit 20. The drive motor 22 and the power generation motor 24 are connected to the drive circuit 20.

An output capacitor 18 is connected between the common connection node of the switching elements S1, S3, and S5 and the common connection node of the switching elements S2, S4, and S6.

A single-phase power plug 26 is connected between the connection node between the relay switch RS1 and the inductor L1 and the connection node between the relay switch RS2 and the inductor L2.

The switching elements S1 to S6 and the relay switches RS1 to RS4 are controlled to be turned on or off by the controller 28. As the switching elements S1 to S6, semiconductor elements such as IGBTs (Insulated Gate Bipolar Transistors), other general bipolar transistors, and field effect transistors can be used. The same applies to the other switching elements in the following description. When an IGBT is used as each switching element, the IGBT is connected at the connection position of each switching element so that the upper side in FIG. 1 is the collector terminal and the lower side is the emitter terminal. Then, a diode is connected between the collector terminal and the emitter terminal of each IGBT so that the emitter terminal side becomes the anode terminal. In this case, the current in the direction from the emitter terminal to the collector terminal flows through the diode because the diode becomes a forward bias. FIG. 2 shows that the IGBT 32 and diode 34 shown on the right side can be used as the switching element 30 shown on the left side.

The operation in the boost mode will be described. In the boost mode, the controller 28 turns on the relay switches RS1 to RS4. Then, the following control is performed so that the voltage obtained by boosting the output voltage of the battery 14 is output to the drive circuit 20 as the output voltage of the switchable three-phase multiphase converter 12.

Of the two switching elements connected up and down, when the upper switching element is turned off and the lower switching element is turned on, the lower side of the battery 14 is connected to the inductor connected to the upper and lower switching elements. Current flows through the switching element. If the lower switching element is turned off in this state, an induced electromotive force is generated in the inductor. At this time, by turning on the upper switching element, a voltage obtained by adding an induced electromotive force to the output voltage of the battery 14 is applied to both ends of the output capacitor 18 and the drive circuit 20.

When the voltage obtained by adding the induced electromotive force to the output voltage of the battery 14 is equal to or higher than the voltage between the terminals of the output capacitor 18, the output capacitor 18 is charged or the charging voltage of the output capacitor 18 is maintained. As a result, a voltage larger than the output voltage of the battery 14 can be output to the drive circuit 20.

When the voltage obtained by adding the induced electromotive force to the output voltage of the battery 14 is smaller than the voltage between the terminals of the output capacitor 18, the output capacitor 18 and the drive circuit 20 are connected to the on upper switching element and its connection. A current flows through the battery 14 and the input capacitor 16 through the inductor. As a result, the battery 14 and the input capacitor 16 can be charged. The input capacitor 16 reduces the ripple component contained in the output voltage of the battery 14 by charging and discharging.

Based on this principle, the controller 28 applies a voltage obtained by adding the inductor-induced electromotive force to the output voltage of the battery 14 to the output capacitor 18, and outputs the voltage between the terminals of the output capacitor 18 to the drive circuit 20. , Controls switching elements S1 to S6. The induced electromotive force generated in each inductor can be adjusted by changing the switching timing of each switching element.

The controller 28 adjusts the switching timing of each switching element according to the traveling control so that the DC voltage corresponding to the traveling control of the mounted vehicle is output from the switching type three-phase multiphase converter 12 to the drive circuit 20.

In this embodiment, three sets of switching elements connected vertically are used. As a result, the ripple component contained in the DC voltage output to the drive circuit 20 can be reduced as compared with the case where one or two sets of upper and lower switching elements are used.

The drive circuit 20 includes an inverter that performs DC / AC conversion by switching. The drive circuit 20 performs DC-AC conversion between the switchable three-phase multi-phase converter 12 and the drive motor 22. The drive circuit 20 converts the DC power output by the switchable three-phase multiphase converter 12 into AC power according to the magnitude relationship between the output voltage of the switchable three-phase multiphase converter 12 and the voltage between the terminals of the drive motor 22. It is converted and the AC power is supplied to the drive motor 22. Further, the generated power of the drive motor 22 is converted into DC power according to the magnitude relationship between the output voltage of the switchable 3-phase multiphase converter 12 and the voltage between the terminals of the drive motor 22, and the DC power is switched to the switchable type 3. It is supplied to the phase multi-phase converter 12.

Similarly, the drive circuit 20 performs DC-AC conversion between the switchable three-phase multi-phase converter 12 and the power generation motor 24. The drive circuit 20 converts the DC power output by the switchable three-phase multiphase converter 12 into AC power according to the magnitude relationship between the output voltage of the switchable three-phase multiphase converter 12 and the voltage between the terminals of the power generation motor 24. It is converted and its AC power is supplied to the power generation motor 24. Further, the generated power of the power generation motor 24 is converted into DC power according to the magnitude relationship between the output voltage of the switchable three-phase multiphase converter 12 and the voltage between the terminals of the power generation motor 24, and the DC power is switched. It is supplied to the phase multi-phase converter 12.

The drive motor 22 drives the on-board vehicle or performs regenerative braking. The power generation motor 24 generates power by the driving force of the engine or starts the engine.

Next, the operation in the external charging mode will be described. The controller 28 controls the relay switches RS1 to RS4 to be turned off. As a result, the circuit configuration is as shown in FIG. The same components as those shown in FIG. 1 are designated by the same reference numerals.

The single-phase power plug 26 is plugged into a single-phase power outlet. One electrode of the single-phase power plug 26 is connected to one end of the inductor L1 on the relay switch RS1 side, and the other electrode of the single-phase power plug 26 is connected to one end of the inductor L2 on the relay switch RS2 side.

A single-phase AC voltage is applied from the single-phase power plug 26 via the inductors L1 and L2 between the connection node A of the switching elements S1 and S2 and the connection node B of the switching elements S3 and S4. The controller 28 operates the switching elements S1 to S4 as a single-phase inverter. That is, PWM (Pulse Width Modulation) control of the switching elements S1 to S4 is performed, the AC voltage between the connection nodes A and B is rectified and boosted, and the DC voltage obtained by this is applied to the output capacitor 18.

The controller 28 is based on the single-phase power plug 26 side, for example, when the voltage between the electrodes of the single-phase power plug 26 is Vsin (ωt) (V is the voltage amplitude, ω is the angular frequency, and t is the time). Control the switching elements S1 to S4 so that the voltage between the terminals of the inductor L1 and the voltage between the terminals of the inductor L2 with reference to the connection node B side are (1/2) Bcos (ωt) (B is the voltage amplitude). To do. Since the current flowing through each inductor is the integrated value of the terminal voltage, the current flowing in from one end of the single-phase power plug 26 and flowing out from the other end is in phase with the voltage between the electrodes of the single-phase power plug 26. Become. As a result, the power factor between the electrodes of the single-phase power plug 26 can be set to 1, and the withstand voltage and current of each component of the switchable three-phase multi-phase converter 12 can be suppressed to the minimum necessary. Further, by the induced electromotive force of the inductors L1 and L2, a voltage larger than the voltage amplitude between the electrodes of the single-phase power plug 26 can be applied to the output capacitor 18.

The controller 28 performs the following control so that the voltage between the terminals of the output capacitor 18 is stepped down and the input capacitor 16 and the battery 14 are charged based on the voltage after stepping down.

When the switching element S6 is turned on and the switching element S5 is turned off, a current flows from the positive electrode of the battery 14 to the switching element S6 via the inductor L3. When the switching element S6 is turned off in this state, an induced electromotive force is generated in the inductor L3. At this time, when the voltage obtained by adding the induced electromotive force of the inductor L3 to the output voltage of the battery 14 is smaller than the voltage between the terminals of the output capacitor 18, by turning on the switch S5, the output capacitor 18 is passed through the inductor L3. , The charge is discharged to the input capacitor 16 and the battery 14, and the input capacitor 16 and the battery 14 can be charged.

Based on this principle, the controller 28 controls the switching elements S5 and S6 so that the electric charge is discharged from the output capacitor 18 to the input capacitor 16 and the battery 14 to charge the input capacitor 16 and the battery 14. As a result, the switchable three-phase multi-phase converter 12 can acquire AC power from an external power supply device and charge the battery 14.

According to such a configuration, the inductors L1 and L2 used as the inductor for boosting in the boosting mode can be used as the inductor for improving the power factor and boosting in the external charging mode. Further, the inductor L3 used as the inductor for step-up in the step-up mode can be used as the inductor for step-down in the external charging mode. As a result, the components used in the step-up mode can be used in the external charging mode, and the scale of the system can be reduced.

Next, an application example of the first embodiment will be described. FIG. 4 shows the configuration of the hybrid vehicle drive system 36 according to the application example. The same components as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

The hybrid vehicle drive system 36 includes a switchable 4-phase multiphase converter 38. The switchable 4-phase multi-phase converter 38 adds an inductor L4, a relay switch RS5, switching elements SA1 and SA2 to the switchable 3-phase multi-phase converter 12 shown in FIG. It enables charging.

One end of the relay switch RS5 is connected to the positive electrode of the battery 14. The other end of the relay switch RS5 is connected to one end of the inductor L3. The other end of the inductor L3 is connected to the connection nodes of the switching elements S5 and S6.

One end of the inductor L4 is connected to the positive electrode of the battery 14. The other end of the inductor L4 is connected to the connection nodes of the switching elements SA1 and SA2. One end of the switching element SA1 opposite to the switching element SA2 side is connected to a common connection node of the switching elements S1, S3, and S5. One end of the switching element SA2 opposite to the switching element SA1 side is connected to a common connection node of the switching elements S2, S4, and S6.

A three-phase power plug 40 is connected to the connection node between the relay switch RS1 and the inductor L1, the connection node between the relay switch RS2 and the inductor L2, and the connection node between the relay switch RS5 and the inductor L3.

When using the IGBT as the switching elements SA1 and SA2, connect the IGBT to the connection position of each switching element so that the upper side of FIG. 4 is the collector terminal and the lower side is the emitter terminal. Then, a diode is connected between the collector terminal and the emitter terminal of each IGBT so that the emitter terminal side becomes the anode terminal.

The operation in the boost mode will be described. In the boost mode, the controller 42 controls the relay switches RS1 to RS5 to be turned on.

The controller 42 has the output capacitor 18 and the voltage obtained by adding the inductor induced electromotive force to the output voltage of the battery 14 based on the same principle as the control for the switching elements connected above and below in the switchable 3-phase multiphase converter 12. The switching elements S1 to S6, SA1 and SA2 are controlled so as to be applied to the drive circuit 20. The induced electromotive force generated in each inductor can be adjusted by changing the switching timing of each switching element.

The controller 42 adjusts the switching timing of each switching element according to the traveling control so that the DC voltage corresponding to the traveling control of the mounted vehicle is output from the switching type 4-phase multiphase converter 38 to the drive circuit 20.

In this embodiment, four sets of switching elements connected vertically are used. As a result, the ripple component contained in the DC voltage output to the drive circuit 20 can be reduced as compared with the case where a set of upper and lower switching elements having a smaller number than four sets is used.

The drive circuit 20 performs DC-AC conversion and power transfer between the switchable 4-phase multi-phase converter 38 and the drive motor 22 and the power generation motor 24.

Next, the operation in the external charging mode will be described. The controller 42 controls the relay switches RS1 to RS5 to be turned off. As a result, the circuit configuration is as shown in FIG. The same components as those shown in FIG. 4 are designated by the same reference numerals.

The three-phase power plug 40 is plugged into a three-phase power outlet. The first electrode of the three-phase power plug 40 is connected to one end of the inductor L1 on the relay switch RS1 side, and the second electrode of the three-phase power plug 40 is connected to one end of the inductor L2 on the relay switch RS2 side. .. Further, the third electrode of the three-phase power plug 40 is connected to one end of the inductor L3 on the relay switch RS5 side.

The connection node A of the switching elements S1 and S2, the connection node B of the switching elements S3 and S4, and the connection node C of the switching elements S5 and S6 are connected to the three-phase AC from the three-phase power plug 40 via the inductors L1, L2 and L3. A voltage is applied. The controller 42 operates the switching elements S1 to S6 as a three-phase inverter. That is, PWM control of the switching elements S1 to S6 is performed, the interphase voltage between the connection nodes A, B, and C is rectified and boosted, and the DC voltage obtained by this is applied to the output capacitor 18.

In the controller 42, for example, the potentials of the three-phase power plug 40 with respect to the neutral point potentials of the first to third electrodes are Vsin (ωt), Vsin (ωt + 120 °), and Vsin (ωt + 240 °, respectively). ), The currents flowing into the first to third electrodes are Isin (ωt), Isin (ωt + 120 °), and Isin (ωt + 240 °), respectively (I is the current amplitude). ), Control the switching elements S1 to S6. As a result, the power factor between the electrodes of the three-phase power plug 40 can be set to 1, and the withstand voltage and current of each component of the switchable 4-phase multiphase converter 38 can be suppressed to the minimum necessary. Further, by the induced electromotive force of the inductors L1 to L3, a voltage larger than the voltage amplitude between the electrodes of the three-phase power plug 40 can be applied to the output capacitor 18.

The controller 42 is a switching element so that the output capacitor 18 discharges charges to the input capacitor 16 and the battery 14 and charges the input capacitor 16 and the battery 14, similar to the control for the switchable three-phase multiphase converter 12 in FIG. Controls SA1 and SA2. Here, the inductor L4 of FIG. 5 has the same function as that of the inductor L3 of FIG. As a result, the switchable 4-phase multi-phase converter 38 can acquire 3-phase AC power from the external power supply device and charge the battery 14.

According to such a configuration, the inductors L1 to L3 used as the inductor for boosting in the boosting mode can be used as the inductor for improving the power factor and boosting in the external charging mode. Further, the inductor L4 used as the inductor for step-up in the step-up mode can be used as the inductor for step-down in the external charging mode. As a result, the components used in the step-up mode can be used in the external charging mode, and the scale of the system can be reduced.

FIG. 6 shows the configuration of the hybrid vehicle drive system 44 according to the second embodiment of the present invention. The hybrid vehicle drive system 44 includes a switchable 6-phase multiphase converter 46. The switchable 6-phase multi-phase converter 46 charges the battery 14 based on the electric power acquired from an external power source such as a commercial power source, or boosts the output voltage of the battery 14 and outputs the battery 14 to the drive circuit 20. The same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

The switchable 6-phase multi-phase converter 46 has a configuration in which an inductor is connected to a connection node of switching elements connected vertically. The switchable 6-phase multiphase converter 46 operates in either a step-up mode in which the output voltage of the battery 14 is boosted or an external charging mode in which the battery 14 is charged based on the power obtained from the external power supply device.

One end of the relay switches SW1 to SW4 is connected to the positive electrode of the battery 14. One ends of inductors L1 and L2 are connected to the other ends of the relay switches SW1 and SW2, respectively. One ends of the inductors L3 and L4 are connected to the other end of the relay switch SW3, and one ends of the inductors L5 and L6 are connected to the other end of the relay switch SW4.

The other end of the inductor L1 is connected to the connection nodes of the switching elements S1 and S2, and the other end of the inductor L2 is connected to the connection nodes of the switching elements S3 and S4. Further, the other end of the inductor L3 is connected to the connection nodes of the switching elements S5 and S6, and the other end of the inductor L4 is connected to the connection nodes of the switching elements S7 and S8. Further, the other end of the inductor L5 is connected to the connection nodes of the switching elements S9 and S10, and the other end of the inductor L6 is connected to the connection nodes of the switching elements S11 and S12.

One end of the switching element S1 opposite to the switching element S2 side, one end of the switching element S3 opposite to the switching element S4 side, one end of the switching element S5 opposite to the switching element S6 side, and the switching element S7. One end opposite to the switching element S8 side is commonly connected to one end of the relay switch SW7. The other end of the relay switch SW7 is connected to the drive circuit 20.

One end of the switching element S2 opposite to the switching element S1, one end of the switching element S4 opposite to the switching element S3 side, one end of the switching element S6 opposite to the switching element S5 side, and the switching element S8 One end opposite to the switching element S7 side is commonly connected to one end of the relay switch SW6. The other end of the relay switch SW6 is connected to the negative electrode of the battery 14 and the drive circuit 20.

A pre-stage output capacitor 18-1 is connected between the common connection node of the switching elements S1, S3, S5, and S7 and the common connection node of the switching elements S2, S4, S6, and S8.

One end of the switching element S9 opposite to the switching element S10 side and one end of the switching element S11 opposite to the switching element S12 side are connected to one end of the drive circuit 20 and the relay switch SW5 and one end of the relay switch SW7. To. The other end of the relay switch SW5 is connected to the positive electrode of the battery 14.

One end of the switching element S10 opposite to the switching element S9 side and one end of the switching element S12 opposite to the switching element S11 side are connected to the negative electrode of the battery 14 and the drive circuit 20.

A post-stage output capacitor 18-2 is connected between the common connection node of the switching elements S9 and S11 and the common connection node of the switching elements S10 and S12.

A single-phase power plug 26 is connected between the connection node between the relay switch SW1 and the inductor L1 and the connection node between the relay switch SW2 and the inductor L2.

The inductors L3 and L5 are magnetically coupled so that when a current flowing toward the switching element flows in one side, an induced electromotive force flowing through the current toward the switching element is generated in the other side. The inductors L4 and L6 are magnetically coupled so that when a current flowing toward the switching element flows in one side, an induced electromotive force flowing through the current toward the switching element is generated in the other side.

The switching elements S1 to S12 and the relay switches SW1 to SW7 are controlled to be turned on or off by the controller 48. When using an IGBT as each switching element, connect the IGBT to the connection position of each switching element so that the upper side of FIG. 6 is the collector terminal and the lower side is the emitter terminal. Then, a diode is connected between the collector terminal and the emitter terminal of each IGBT so that the emitter terminal side becomes the anode terminal.

The operation in the boost mode will be described. In the boost mode, the controller 48 controls the relay switches SW1 to SW4, SW6 and SW7 to be on, and the relay switch SW5 to be off.

In the controller 48, the voltage obtained by adding the inductor induced electromotive force to the output voltage of the battery 14 is the first stage based on the same principle as the control for the switching elements connected above and below in the switchable 3-phase multiphase converter 12 of FIG. The switching elements S1 to S12 are controlled so that they are applied to the output capacitor 18-1, the subsequent output capacitor 18-2, and the drive circuit 20. The induced electromotive force generated in each inductor can be adjusted by changing the switching timing of each switching element.

The controller 48 adjusts the switching timing of each switching element according to the traveling control so that the DC voltage corresponding to the traveling control of the mounted vehicle is output from the switching type 6-phase multiphase converter 46 to the drive circuit 20.

In this embodiment, six sets of switching elements connected vertically are used. As a result, the ripple component contained in the DC voltage output to the drive circuit 20 can be reduced as compared with the case where a number of upper and lower switching element sets smaller than 6 sets is used.

The drive circuit 20 performs DC-AC conversion and power transfer between the switchable 6-phase multiphase converter 46 and the drive motor 22 and the power generation motor 24.

Next, the operation in the external charging mode will be described. The controller 48 controls the relay switches SW1 to SW4, SW6 and SW7 to be off, and SW5 to be on. As a result, the circuit configuration is as shown in FIG. The same components as those shown in FIG. 6 are designated by the same reference numerals. In the external charging mode, the switchable 6-phase multi-phase converter 46 is divided into a component before the inductor L3 + L4 and a component after the inductor L5 + L6.

The single-phase power plug 26 is plugged into a single-phase power outlet. One electrode of the single-phase power plug 26 is connected to one end of the inductor L1 on the relay switch SW1 side, and the other electrode of the single-phase power plug 26 is connected to one end of the inductor L2 on the relay switch SW2 side. The drive circuit 20 is connected to the right side of the battery 14 in FIG.

Similar to the embodiment shown in FIG. 3, the controller 48 operates the switching elements S1 to S4 as a single-phase inverter. As a result, the AC voltage between the connection nodes A and B is rectified and boosted, and the DC voltage after the rectification and boosting is applied to the pre-stage output capacitor 18-1.

A primary inductor L3 + L4 is connected between the connection node D of the switching elements S5 and S6 and the connection node E of the switching elements S7 and S8. The primary inductor L3 + L4 is an inductor L3 and L4 connected in series. A secondary inductor L5 + L6 is connected between the connection node F of the switching elements S9 and S10 and the connection node G of the switching elements S11 and S12. The secondary inductor L5 + L6 is made by connecting inductors L5 and L6 in series.

The controller 48 operates the switching elements S5 to S8 as a single-phase inverter. That is, PWM control of the switching elements S5 to S8 is performed, the voltage between the terminals of the pre-stage output capacitor 18-1 is converted into an AC voltage, and the AC voltage is applied to the primary inductor L3 + L4. Due to the magnetic coupling between the primary inductor L3 + L4 and the secondary inductor L5 + L6, an AC voltage is generated at the secondary L5 + L6, and the AC voltage is between the connection node F and the connection node G. It is applied.

The controller 48 operates the switching elements S9 to S12 as a single-phase inverter. That is, PWM control of the switching elements S9 to S12 is performed, the AC voltage applied between the connection node F and the connection node G from the secondary inductor L5 + L6 is rectified, and the rectified DC voltage is converted to the subsequent output capacitor. 18-2, apply to input capacitor 16 and battery 14. As a result, the switchable 6-phase multi-phase converter 46 can obtain power from the external power supply device and charge the battery 14.

According to such a configuration, the inductors L1 and L2 used as the inductor for boosting in the boosting mode can be used as the inductor for improving the power factor and boosting in the external charging mode. As a result, the components used in the step-up mode can be used in the external charging mode, and the scale of the system can be reduced.

Further, in the external charging mode, the front stage portion and the rear stage portion are coupled based on the magnetic coupling of the primary side inductor L3 + L4 and the secondary side inductor L5 + L6, and are electrically insulated. As a result, it is possible to avoid applying a high voltage to the front stage portion, and when handling the single-phase power plug 26 in the front stage portion, shortening the system life due to contact between the parts to which the high voltage is applied, etc. Can be avoided.

Next, an application example of the second embodiment will be described. FIG. 8 shows the configuration of the hybrid vehicle drive system 50 according to the application example. The same components as those shown in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted.

The hybrid vehicle drive system 50 includes a switchable 7-phase multiphase converter 52. The switchable 7-phase multi-phase converter 52 adds an inductor L7, a relay switch SW8, switching elements SA3 and SA4 to the switchable 6-phase multi-phase converter 46 shown in FIG. It enables charging.

One end of the relay switch SW8 is connected to the positive electrode of the battery 14. The other end of the relay switch SW8 is connected to one end of the inductor L7. The other end of the inductor L7 is connected to the connection nodes of the switching elements SA3 and SA4.

One end of the switching element SA3 opposite to the switching element SA4 side is connected to a common connection node of the switching elements S1, S3, S5, and S7. One end of the switching element SA4 opposite to the switching element SA3 side is connected to a common connection node of the switching elements S2, S4, S6, and S8.

A three-phase power plug 40 is connected to the connection node between the relay switch SW1 and the inductor L1, the connection node between the relay switch SW2 and the inductor L2, and the connection node between the relay switch SW8 and the inductor L7.

When using the IGBT as the switching elements SA3 and SA4, connect the IGBT to the connection position of each switching element so that the upper side of FIG. 8 is the collector terminal and the lower side is the emitter terminal. Then, a diode is connected between the collector terminal and the emitter terminal of each IGBT so that the emitter terminal side becomes the anode terminal.

The operation in the boost mode will be described. In the boost mode, the controller 54 controls the relay switches SW1 to SW4 and SW6 to SW8 to be on and SW5 to be off.

In the controller 54, the voltage obtained by adding the inductor induced electromotive force to the output voltage of the battery 14 is the first stage based on the same principle as the control for the switching elements connected above and below in the switchable 6-phase multiphase converter 46 of FIG. The switching elements S1 to S12, SA3, and SA4 are controlled so as to be applied to the output capacitor 18-1 and the subsequent output capacitor 18-2, and the drive circuit 20. The induced electromotive force generated in each inductor can be adjusted by changing the switching timing of each switching element.

The controller 54 adjusts the switching timing of each switching element according to the traveling control so that the DC voltage corresponding to the traveling control of the mounted vehicle is output from the switching type 7-phase multiphase converter 52 to the drive circuit 20.

In this embodiment, seven sets of switching elements connected vertically are used. As a result, the ripple component contained in the DC voltage output to the drive circuit 20 can be reduced as compared with the case where a number of upper and lower switching element sets smaller than 7 sets is used.

The drive circuit 20 performs DC-AC conversion and power transfer between the switchable 7-phase multi-phase converter 52 and the drive motor 22 and the power generation motor 24.

Next, the operation in the external charging mode will be described. The controller 54 controls the relay switches SW1 to SW4 and SW6 to SW8 to be off, and SW5 to be on. As a result, the circuit configuration is as shown in FIG. The same components as those shown in FIG. 8 are designated by the same reference numerals.

The three-phase power plug 40 is plugged into a three-phase power outlet. The first electrode of the three-phase power plug 40 is connected to one end of the inductor L1 on the relay switch SW1 side, and the second electrode of the three-phase power plug 40 is connected to one end of the inductor L2 on the relay switch SW2 side. .. Further, the third electrode of the three-phase power plug 40 is connected to one end of the inductor L7 on the relay switch SW8 side.

The connection node A of the switching elements S1 and S2, the connection node B of the switching elements S3 and S4, and the connection node H of the switching elements SA3 and SA4 are connected to the three-phase AC from the three-phase power plug 40 via the inductors L1, L2 and L7. A voltage is applied. The controller 54 operates the switching elements S1 to S4, SA3 and SA4 as a three-phase inverter. As a result, the interphase voltage between the connection nodes A, B, and H is rectified and boosted, and the DC voltage obtained thereby is applied to the pre-stage output capacitor 18-1.

In the controller 54, for example, the potentials of the three-phase power plug 40 with respect to the neutral point potentials of the first to third electrodes are Vsin (ωt), Vsin (ωt + 120 °), and Vsin (ωt + 240 °, respectively). ), The switching elements S1 ~ so that the currents flowing into the first to third electrodes are Isin (ωt), Isin (ωt + 120 °), and Isin (ωt + 240 °), respectively. Controls S4, SA3 and SA4. As a result, the power factor between the electrodes of the three-phase power plug 40 can be set to 1, and the withstand voltage and current of each component of the switchable 7-phase multiphase converter 52 can be suppressed to the minimum necessary. Further, by the induced electromotive force of the inductors L1, L2, and L7, a voltage larger than the voltage amplitude between the electrodes of the three-phase power plug 40 can be applied to the pre-stage output capacitor 18-1.

The controller 54 operates the switching elements S5 to S8 as a single-phase inverter and the switching elements S9 to S12 as a single-phase inverter, as in the control for the switchable 6-phase multiphase converter 46 of FIG. As a result, the switchable 7-phase multi-phase converter 52 can acquire 3-phase AC power from the external power supply device and charge the battery 14.

According to such a configuration, the inductors L1, L2, and L7 used as the inductor for boosting in the boosting mode can be used as the inductor for improving the power factor and boosting in the external charging mode.

Further, in the external charging mode, the front stage portion and the rear stage portion are coupled based on the magnetic coupling of the primary side inductor L3 + L4 and the secondary side inductor L5 + L6, and are electrically insulated. As a result, it is possible to avoid applying a high voltage to the front stage portion, and when handling the three-phase power plug 40 in the front stage portion, shortening the system life due to contact between the parts to which the high voltage is applied, etc. Can be avoided.

In the above, the case where the switchable multi-phase multi-phase converter according to the embodiment of the present invention is used in the hybrid vehicle drive system has been described. The switchable multi-phase multiphase converter according to the embodiment of the present invention can be used in an electric vehicle. In this case, it is not always necessary to use the power generation motor 24, and the drive circuit 20 may be configured to perform DC-AC conversion and power transfer between the switchable multi-phase multi-phase converter and the drive motor 22.

10,36,44,50 Hybrid vehicle drive system, 12 switchable 3-phase multi-phase converter, 14 batteries, 16 input capacitors, 18 output capacitors, 18-1 front output capacitors, 18-2 rear output capacitors, 20 drive circuits, 22 drive motor, 24 power generation motor, 26 single-phase power plug, 28,42,48,54 controller, 30, S1 to S12 switching element, 32 IGBT, 34 diode, 38 switchable 4-phase multi-phase converter, 40 3-phase power supply Plug, 46 switchable 6-phase multi-phase converter, 52 switchable 7-phase multi-phase converter, L1 to L7 inductor, RS1 to RS5, SW1 to SW8 relay switch.