Power feeding apparatus, transporter and transport system

Power supply device, transport vehicle and transport system

[Detailed description of the invention] [Technical field to which the invention belongs]

The present invention relates to a power supply device capable of avoiding destruction of circuit elements due to increased overload, and a transport vehicle and a transport system provided with the power supply device.

[Literature Technology]

Conventionally, various transportation systems for carrying out the transportation of materials by the transportation vehicles that move along the guide track are realized in order to achieve the efficiency of the transportation of materials in factories, warehouses, etc. Generally, such a truck uses a motor to travel, and the motor is supplied with electric power through a power supply line installed along the guide rail.

The power supply device includes trolley type and non-contact type. Because the so-called dust and mustard are less generated and the need for maintenance is low, most of them use non-contact power supply. The non-contact power supply method is located near the power supply line and is equipped with a pickup coil installed on the side of the truck. The electromagnetic combination between the pickup device and the power supply line generates induced electromotive force to supply power. .

Figure 5 is a block diagram showing the conventional non-contact power supply device. In the figure, 1 is a pickup device formed by winding the pickup coil L to a pickup core (not shown). The pick-up device 1 described above is provided on a transport vehicle or the like, and is located near the power supply line 9 connected to the power line 11. The above-mentioned power supply line 9 is installed along a guide rail (not shown) laid in the factory. The transport vehicle can be moved along the guide rail. At the above pickup line On the circle L, the resonance capacitor C and the rectifier circuit 4 are connected in parallel together. The coil L and the resonant capacitor C constitute a resonant circuit 2. The output terminal of the rectifier circuit 4 is connected to the input terminal of the constant voltage circuit 40. The output terminal of the constant voltage circuit 40 becomes the output terminals U and V of the non-contact power supply device, and on the output terminals U, V, and The driving part of the above-mentioned truck is connected.

The non-contact power supply device having such a structure generates an induced electromotive force on the pickup coil L by supplying AC power to the power supply line 9 connected to the power line 11. The above-mentioned induced electromotive force is resonated in the resonance circuit 2 to obtain the maximum electric power, and then rectified in the rectifier circuit 4 to become electric power having the constant voltage characteristics of the constant voltage circuit 40, and is output from the output terminals U, V . The electric power output from the output terminals U and V is supplied to the driving part of the transport vehicle (not shown) to drive the transport vehicle.

[The problem to be solved by the invention]

However, in the above-mentioned non-contact power supply device, the rectifier circuit 4 and the constant voltage circuit 40 are open, and when the load 10 contains an inverter and the circuit is short-circuited, an excessive current flows through the pickup coil L, and resonance occurs , Excessive voltage is generated on the resonant capacitor C. Therefore, there are doubts about the destruction of circuit components and the burning due to heat. In order for the operator to perform spot inspection and repair of abnormal places, even if other non-contact power supply devices are normal, the power supply must be stopped.

As mentioned above, in the conventional non-contact power supply device, due to the excessive current flowing through the pickup coil L, the excessive current is generated on the resonant capacitor C due to resonance. Pressure, and there is the destruction of circuit components burning doubts. In order to prevent this, it has a heat sensor installed near the pickup coil L, and a contact point between the two ends of the pickup coil L or the output terminal of the rectifier circuit 4, and is provided even if the power supply is interrupted. A thermally sensitive mechanical latch relay that can maintain the contact state. When the temperature of the pickup coil L exceeds a predetermined temperature, the contacts of the mechanical latch relay are closed to make both of the pickup coils L A non-contact power supply device for preventing damage and burning of circuit elements, or short-circuit between the output terminals of the rectifier circuit 4, is published in Japanese Patent Application Liad-Open No.11-164497 (1999) Was announced.

According to the non-contact power supply device of JP 11-164497 (Japanese Patent Application Liad-Open No. 11-164497 (1999)), when an abnormality occurs, the input voltage of the constant voltage circuit 40 becomes 0, and the non-contact power supply device Since the output power disappears, it cannot communicate with the non-contact power supply device that caused the abnormality, and cannot display the abnormality in the non-contact power supply device. When the instantaneous excessive current flows to the pickup coil L, the temperature of the pickup coil L rises. However, because it takes a long time to reach the predetermined temperature, an excessive voltage is applied to the circuit element until the mechanical latch relay is activated. And the situation of being destroyed. And because the mechanical latch type relay is used, in order to release the abnormal stop, the operator must perform the release operation of the latch on the non-contact power supply device where the abnormality occurs. If the non-contact power supply device is installed near the ceiling of the factory, the operation is complicated and dangerous.

In order to improve the danger of the above-mentioned mechanical latching relay's latch release operation. Troublesome, there are contacts between the two ends of the pickup coil L or the output terminals of the rectifier circuit 4, and by having an automatic thermostat with a heat sensor near the pickup coil L, if the temperature of the pickup coil L becomes a predetermined value Above, the above-mentioned contact is closed to avoid the destruction of the circuit element, and then if the temperature drops below the predetermined value, the above-mentioned contact is opened to turn on the non-contact power supply device for power supply, as described in JP 11-164498 ( It was announced on Japanese Patent Application Liad-Open No.11-164498 (1999)).

According to the non-contact power supply device of Japanese Patent Application Liad-Open No. 11-164498 (1999), when an abnormality occurs, even if the operators abnormal place is inspected, it is picked up before the repair is completed. When the temperature of the coil L drops below the predetermined value, the contact of the automatic thermostat opens and naturally recovers, so it is possible to perform a spot check. The repairing operator will feel the electricity, and there will be repeated abnormalities caused by the same reason. possibility.

The present invention was invented in view of the above-mentioned circumstances, and its purpose is to realize that by providing a short circuit between the output terminal of the rectifier circuit and the output terminal of the power supply device, the load is short-circuited at both ends of the pickup coil. , When an excessive voltage exceeding a predetermined value is generated, the switching element becomes a non-passing state, which can prevent excessive current from flowing in the above load, and can prevent excessive current generated in the pickup coil and excessive resonant capacitor The destruction and burning of circuit components caused by voltage will not cause a delay to the instantaneous excessive voltage, but can make the above-mentioned switching components become inoperable. Status of the power supply device.

The above-mentioned switching control circuit can realize a structure that obtains power from the output side terminal of the above-mentioned rectifier circuit, and can obtain power even when the above-mentioned switching element is in a non-conducting state during abnormal conditions. Displays the power supply device due to the abnormality of the non-contact power supply device itself.

In addition to the above, its purpose is to realize that by providing a communication unit on the switching control circuit, the switching element can be maintained in an unconnected state for remote operation control, and the release operation accompanying the switching element can be avoided. The power supply device can avoid the danger caused by the automatic recovery operation at the same time.

Its purpose is to realize that by providing a temperature sensor (sensor) whose position is near the pickup coil and connected to the switching control circuit, even if the voltage across the pickup coil is below the predetermined value, When the temperature of the pick-up coil becomes higher than the predetermined temperature due to temperature rise and current increase in the vicinity of the pick-up coil, the switching element becomes blocked, which can avoid the destruction of the circuit element. Burning power supply device.

Another purpose is to realize that by providing a fuse on the contact point between the pickup coil and the switching control circuit, even if an abnormality occurs in the switching control circuit, the control of the switching element cannot be controlled and excessive current flows. In this case, the above-mentioned fuse becomes an open circuit, which can avoid the power supply device of the circuit element from being damaged by the supply of excessive current and excessive voltage.

And its purpose is to realize that by having the above-mentioned power supply device, it can be applied A transport vehicle that can be stably driven when an abnormality occurs when the auxiliary power is supplied, and a transport system that can be stably driven by having a power supply line that supplies power to the power supply device of the transport vehicle.

[Means to solve the problem]

The power supply device of the first invention includes: a pickup coil that generates an induced electromotive force; a rectifier circuit that rectifies the induced electromotive force generated in the pickup coil; and an output terminal that outputs the output power from the rectifier circuit, which is characterized by including: A switching element is connected between the output terminal of the rectifier circuit and the output terminal; and a switching control circuit is connected to the pickup coil and the switching element, and by obtaining power from the output terminal of the rectifier circuit, The on/off control of the switching element is performed according to the voltage across the pickup coil.

Regarding the power supply device of the second invention, the power supply device described in item 1 of the scope of patent application is characterized by having a temperature sensor connected to the above-mentioned switching control circuit and outputting a signal corresponding to the temperature of the above-mentioned pickup coil, and The switching control circuit controls the on/off control of the switching element according to the output signal of the temperature sensor.

Regarding the power supply device of the third invention, in the power supply device described in the first and second claims, it is characterized in that the contact point between the pickup coil and the switching control circuit is provided with a package fuse.

Regarding the power supply device of the fourth invention, in the power supply device described in any one of claims 1 to 3, the switching control circuit includes a communication unit.

The transport vehicle according to the fifth invention is characterized in that it is provided with the power supply device described in any one of items 1 to 4 in the scope of the patent application, and is driven by electric power supplied from the power supply device.

The conveying system of the sixth invention is characterized by having a power supply line connected to a power source to generate induced electromotive force on a picking device, and a conveying vehicle described in item 5 of the scope of patent application.

According to the power supply device of the first invention, when an excessive voltage exceeding a predetermined value is generated at both ends of the pickup coil due to a short-circuit of the load, the switching control circuit causes the switching element to be in a non-conducting state. The power supply is stopped to prevent excessive current from flowing in the load. It can also prevent the destruction and burning of circuit components caused by the excessive current generated on the pickup coil and the excessive voltage generated on the resonant capacitor. There is no delay to the instantaneous excessive voltage, and the above-mentioned switching element can be turned into a power supply device in a non-conducting state.

The switching control circuit can display the abnormality of the power supply device itself and maintain the non-communication state of the switching element even when the switching element is in a non-communication state during abnormality.

According to the power supply device of the second invention, even if the voltage generated by the pick-up coil is below the predetermined value, the temperature of the pick-up coil becomes higher than the predetermined temperature due to temperature rise or current increase in the vicinity of the pick-up coil , The above-mentioned switching element becomes a non-communication state, and the destruction of the circuit element can be avoided. A burning power supply device.

According to the power supply device of the third invention, even if an abnormality occurs in the switching control circuit, the control of the switching element cannot be controlled and the flow In the case of excessive current, the above-mentioned fuse becomes an open circuit, which can avoid damage due to the supply of excessive current and excessive voltage. Combustion circuit components.

According to the power supply device of the fourth invention, it is possible to control the above-mentioned switching element by remote operation, and it is possible to avoid the danger of performing the above-mentioned switching element cancellation operation in a place equipped with an abnormal power supply device. Complexity, and at the same time, it can avoid the danger of the operator due to automatic recovery.

According to the case of the transport vehicle of the fifth invention, it is possible to cope with the occurrence of an abnormality when electric power is supplied, and it can be driven stably.

According to the transportation system of the sixth invention, stable driving and efficient material transportation can be realized.

[Examples of the invention]

Figure 1 is a block diagram showing an embodiment using the power supply device of the present invention; Figure 2 is a diagrammatic side view showing the structure of a transport vehicle equipped with the above non-contact power supply device.

23 is attached to the lower part of the U-shaped vehicle body frame 24, and constitutes a transport vehicle with a carrier 25 that can be attached to and detached from the carrier 25 to be transported. On the upper part of the vehicle body frame 24, the pickup device 1 and the motor M are mounted. In a factory with a roughly I-shaped cross section, a power supply line 9 is attached along the guide rail 20 that is laid. The AC power supplied from the power line 11 to the power supply line 9 causes the pickup device 1 to generate induced electromotive force by electromagnetic coupling, and the pickup device 1 is driven by the power motor M, and the transport vehicle 23 is driven. The driving wheels 24a of the transport vehicle 23 are in rotational contact with the guide On the upper surface of the cover part 20u of the road rail 20, the above-mentioned transport vehicle 23 moves along the guide rail 20.

The pick-up device 1 is formed by winding pick-up coils L1 and L2 on a pick-up core not shown in the figure, and a resonance capacitor C1 is connected in parallel to the pick-up coils L1 and L2. The resonant circuit 2 is formed by the pickup coils L1 and L2 and the resonant capacitor C1. Between the connection of the pickup coil L1 and the resonance capacitor C1, the fuse F is connected in series.

In the above-mentioned resonance capacitor C1, the capacitor C2, the coil L3 and the capacitor connected in series are connected in parallel. A π-type (CLC-type) immittance conversion circuit 3 is formed by the capacitors C2, C3 and the coil L3. The common contact point between the capacitor C3 and the coil L3, and the common contact point between the capacitor C2 and the capacitor C3 each become a connection point with the input side terminal of the rectifier circuit 4. To the output side terminal of the rectifier circuit 4, the capacitor C4 is connected in parallel, and the terminals on one side of the relays R1 and R2, which are switching elements, are connected. The terminals on the other side of the above-mentioned relays R1 and R2 respectively form the output terminals U and V of the non-contact power supply device, and are connected to the load 10 such as the motor M of the truck 23.

It is located at both ends of the resonant capacitor C1 and near the pickup coils L1 and L2, and a temperature sensor 7 with contacts is connected to a protection circuit (switching control circuit) 6. The protection circuit 6 is connected to the relay coils r1 and r2 of the relays R1 and R2, and is equipped with an antenna and an alarm 12 that form a communication unit. The output terminal of the circuit 4 is used to supply power. However, the temperature sensor 7 is positioned close to the pickup coils L1 and L2, and in order to reduce the influence of the magnetic field, a straight line is set on the magnetic field generated by the pickup core. Angle, and use non-metallic materials such as temperature-sensitive ferrite (ferrite) and thermistor (thermistor). The non-contact power supply device, except for the circuit part of the pickup device 1, is housed in a circuit box 30 installed on the upper part of the vehicle body frame 24 of the transport vehicle 23.

Fig. 3 is a block diagram showing the structure of a protection circuit 6 equipped with a non-contact power supply device using the power supply device of the present invention. The voltage generated on both ends of the resonance capacitor C1 is rectified and smoothed by the rectification and smoothing circuit 62 that constitutes the protection circuit 6, and is compared with the threshold voltage on the comparison circuit 63 such as a comparator. Since the comparison circuit 63 and the relay sequential circuit 61 pass through a photo coupler, the output signal of the above-mentioned comparison circuit 63 is transmitted to the relay sequential circuit 61 in an insulated state, and converted into on/off control The control signals of the relays R1 and R2 are input to the above-mentioned relay coils r1 and r2.

The temperature sensor 7 detects the voltage signal corresponding to the temperature of the pickup coils L1 and L2, and inputs it to the relay sequential circuit 61. The temperature sensor 7 has a contact 71, and the contact 71 performs a contact action corresponding to the temperature of the pickup coils L1 and L2. In short, when the temperature of the pickup coils L1 and L2 is below the threshold value, the contact 71 becomes a closed circuit (OFF), and when the temperature is above the threshold, the contact 71 becomes a circuit (ON). The above-mentioned voltage signal is converted into the control signal of the on/off control relay R1 and R2 on the above-mentioned relay sequential circuit 61, and is input to the above-mentioned relay coils r1 and r2.

The operation of the non-contact power supply device having such a structure will be described.

By supplying AC power with constant current characteristics to connect to the power source On the power supply line 9 of 11, an induced electromotive force with constant current characteristics is generated on the pickup coils L1 and L2 of the pickup device 1. The above-mentioned induced electromotive force is resonated in the resonance circuit 2 and the voltage is boosted, and at the same time the reactive power component is removed, and by the immittance conversion circuit 3, the constant current characteristic is converted to the constant voltage characteristic. It is rectified and smoothed by the rectifier circuit 4 and the capacitor C4, and output through the output terminals U, V through the relays R1 and R2 in the open state. The electric power is supplied to a load 10 such as a motor M of the transport vehicle 23 to drive the transport vehicle 23.

On the other hand, the protection circuit 6 supplies power from the output terminal of the rectifier circuit 4 through the DC/DC converter 8, and takes in the signal corresponding to the voltage generated at both ends of the resonant capacitor C1 and the corresponding temperature sensor The signal of the temperature of the pickup coil L1, L2 measured by the device 7.

When an abnormality such as a short circuit occurs in the circuit built into the load 10, it is in the same state as the output terminals U and V of the non-contact power supply device are short-circuited, so a large current flows through the pickup coils L1 and L2 , And an excessive voltage is generated on the resonant capacitor C1. When the voltage generated on the resonant capacitor C1 exceeds the threshold, the protection circuit 6 cuts off (closes) the relays R1 and R2, and activates the alarm 12 at the same time. Even if the voltage generated on the resonant capacitor C1 is below the threshold, the temperature of the pickup coils L1 and L2 will rise due to the temperature increase around the pickup coils L1 and L2, or the current increase, etc., the temperature measured by the temperature sensor 7 When the value is above the threshold value, the protection circuit 6 cuts off the relays R1 and R2 and activates the alarm 12 at the same time.

On such a non-contact power supply device, by blocking the relay R1, R2, the output power of the non-contact power supply device is 0, but the protection circuit 6 obtains power from the output side terminal of the rectifier circuit 4 through the DC/DC converter 8, so it can maintain the isolation state of the above-mentioned relays R1 and R2 And the activation state of the alarm 12.

During the period when the interrupted state of the relays R1 and R2 is maintained, a check on the abnormality generated on the load 10 such as a truck is performed. The necessary measures such as repairs are then transmitted from the outside to the protection circuit 6 through the antenna W to indicate signals to make the relays R1 and R2 open. The protection circuit 6 is controlled in an open state using the instruction signal as a reference, and the load 10 such as a truck is transported again by supplying electric power from a non-contact power supply device to drive it.

However, if an abnormality occurs in any of the immittance conversion circuit 3, the rectifier circuit 4, the relays R1, R2, and the protection circuit 6, the relays R1 and R2 cannot be controlled, and excessive current flows in the pickup coils L1 and L2. By opening the fuse F, the power supply of the non-contact power supply device caused by the abnormality is forcibly stopped.

However, the immittance conversion circuit 3 can also be π-type (LCL-type), T-type (CLC-type), T-type (LCL-type), and cross-type immittance-transformation in addition to those shown in Figure 1. The circuit can also use a constant voltage circuit to replace the immittance conversion circuit. In the protection circuit 6 of this embodiment, the voltage across the resonant capacitor C1 and the temperature of the pickup coils L1 and L2 are used as objects to perform the control of the relays R1 and R2. In addition, a converter can also be used for the resonance capacitor C1, the current of the pickup coil L1, L2, the output current of the immittance conversion circuit 3, and the DC output current of the rectifier circuit 4. The measured value of shunt resistance etc. is used as the object, and the magnetic flux density of the magnetic core is picked up, and the value measured by the detection coil is used as the object to control the relays R1 and R2. In addition to relays, switching elements can also use transistors and thyristors.

Fig. 4 is a schematic perspective view showing a transport system equipped with a non-contact power supply device using the power supply device of the present invention. In this transport system, a power supply line (refer to Figure 2) is installed along the guide rail 20 laid in the factory and connected to the power supply 11. On the above-mentioned guide rail 20, the transport vehicle 23 shown in FIG. 3 is suspended in plural, and the system controller 22 is driven and controlled to transport the object to be transported. However, as explained in the non-contact power supply device shown in Fig. 1, during the driving of the transport vehicle 23, the opening of the circuit of the non-contact power supply device or the short circuit of the drive circuit of the transport vehicle 23 may be the In the event of an abnormality, the protection circuit 6 of the non-contact power supply device is used to stop the supply of electric power, and the alarm 12 is activated to notify the occurrence of the abnormality.

[Effects of the invention]

According to the power supply device of the first invention, when an excessive voltage exceeding a predetermined value is generated at both ends of the pickup coil due to a short-circuit of the load, the above-mentioned switching element becomes in a non-conducting state, and the power supply is not stopped and the load can be prevented from flowing excessively. Current. It can also prevent damage to circuit components caused by the excessive current generated on the pickup coil and the excessive voltage generated on the resonant capacitor. It will not cause a delay to the instantaneous excessive voltage, but can make the above-mentioned switching element into a non-conducting state. And even when an exception occurs, It can also display the abnormality of the power supply device itself.

According to the power supply device of the second invention, even if the voltage across the pickup coil is below the predetermined value, the pickup coil is switched when the temperature near the pickup coil rises or current increases, etc. The component becomes a non-communication state, which can avoid the destruction of circuit components. Burning power supply device.

According to the power supply device of the third invention, even if an abnormality occurs in the switching control circuit and the control of the switching element cannot be controlled and excessive current flows, the fuse becomes open, and the supply of excessive current and excessive voltage can be avoided. To destroy. Burn circuit components.

According to the power supply device of the fourth invention, it is possible to control the switching element by remote operation, and to avoid the danger and cumbersomeness of performing the above-mentioned removal operation of the switching element in the place where the abnormal power supply device is provided. Avoid the danger of the operator due to automatic recovery.

According to the transport vehicle of the fifth invention, it is possible to cope with the occurrence of an abnormality when electric power is supplied, and it can be driven stably.

According to the transportation system of the sixth invention, stable driving and efficient material transportation can be realized.

<p>1 Pickup device 2 Resonance circuit 3 Immittance conversion circuit 4 Rectifier circuit 6 Protection circuit (switching control circuit) 7 Temperature sensor 8 DC/DC converter 9 Power supply line 10 Load 11 Power supply 12 Alarm 20 Guide rail 22 System controller 23 Transport Car 24 Car body frame 25 Carrier 30 Circuit box F Fuse L1, L2 Pick-up coil M Motor R1, R2 Relay r1, r2 Relay coil</p>

Figure 1 is a block diagram showing an embodiment of a non-contact power supply device using the power supply device of the present invention. Figure 2 is a schematic side view showing the structure of a transport vehicle equipped with a non-contact power supply device using the power supply device of the present invention. Fig. 3 is a block diagram showing the structure of a protection circuit 6 (switching control circuit) of a non-contact power supply device using the power supply device of the present invention. Fig. 4 is a schematic perspective view showing a transport system equipped with a non-contact power supply device using the power supply device of the present invention. Figure 5 is a block diagram showing the conventional non-contact power supply device.