Power supply device and electronic apparatus

The present invention relates to a power supply device and an electronic device of a type in which a battery unit is attached to and detached from a main body of a mobile phone. In particular, the present invention relates to a power supply device and an electronic device for switching between a second battery connected from the outside such as a mobile phone and a first battery arranged in the main body of the mobile phone to supply electric power. ..

Since a portable electronic device such as a mobile phone uses a battery as a power source, the mobile phone cannot be used when the remaining battery level is exhausted. Therefore, some mobile phones are set to have multiple batteries, monitor the battery voltage, and issue an alarm (warning display) when the battery is low. It has been proposed (see, for example, Patent Document 1).

Then, for example, the user who saw the above warning display stopped using the mobile phone and replaced or charged the battery. Further, among other mobile phones, a type in which a built-in battery and an external battery are provided and the batteries are switched to operate the mobile phone when the remaining battery level is exhausted has been proposed (for example, Patent Documents). 2).

A portable electronic device, for example, a mobile phone, is equipped with functions such as a digital camera, a radio, and a television in addition to the telephone function. Further, in recent years, mobile phones are equipped with a high-resolution display device that obtains a high-quality image, a sub display device, a flash for a camera, or the like. As each of the above functions increases, the power consumption of the mobile phone increases.

On the other hand, considering the portability of the mobile phone, the external size of the mobile phone is required to be smaller and thinner. Therefore, the volume of the battery mounted on the mobile phone tends to be reduced. Therefore, there is an increasing demand for a small power supply device that can use a mobile phone for a long time.

<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2000-165514</text></patcit><patcit num="2"><text>Special Table 2002-504800</text></patcit>

<p> By the way, in Patent Document 1 and Patent Document 2, the battery serving as a power source is switched by monitoring (detecting) the respective voltages of the spare battery (internal battery) and the battery pack (external battery). However, if the battery pack is suddenly removed from the mobile phone while the battery pack is in use, the power supply from the battery pack to the control circuit (battery switching circuit) is stopped. Therefore, before the power is switched from the battery pack to the spare battery, the power of the mobile phone is turned off, so that the call is forcibly terminated.</p><p> Note that Patent Document 2 states that the software is designed to switch to the internal battery when the external battery is removed (see paragraph number "0027" of Patent Document 2). However, Patent Document 2 does not disclose a specific configuration for switching from the external battery to the internal battery when the external battery is removed, and cannot be implemented as a product. That is, in the software design alone, when the external battery is actually removed, the power is turned off before switching from the external battery to the internal battery.</p><p> An object of the present invention is to provide a power supply device and an electronic device capable of supplying power even when the external battery is removed from the main body of the electronic device.</p>

<p> The power supply device of the present invention includes a first battery arranged in a main body of an electronic device, a battery unit detachably arranged with respect to the main body, a second battery arranged in the battery unit, and the electronic device. Before the power of the device is turned off, the first detecting means for detecting the removed state before the battery unit is completely removed from the main body, and the first detecting means are the battery unit and the battery unit. A control means for switching and controlling the power supply of the electronic device from the second battery to the first battery when the removed state of the main body is detected is provided.</p><p> Another invention is an electronic device including the power supply device according to any one of claims 1 to 8, wherein the first battery is a rechargeable battery. Further, another invention is an electronic device provided with the power supply device according to claim 1, wherein the first battery and the second battery are rechargeable batteries, and the battery unit uses the first battery. A first charging circuit for charging, a first connecting means for supplying charging power from the outside to the first charging circuit, and a second connection for supplying the charging power to the second charging circuit of the electronic device. When the second connecting means is connected to the second charging circuit and the charging power is supplied to the first connecting means, the first battery and the second charging means are provided. It is an electronic device that charges the battery of.</p>

<p> When the first detecting means detects the removed state in the battery unit and the main body of the electronic device, the control means turns the power of the electronic device from the second battery to the first battery before the power of the electronic device is turned off. Switch to. That is, when the operation of removing the battery unit from the main body while the second battery is in use, for example, when the locking means for locking the battery unit is released, the control means is powered by the power supply before the power supply of the second battery is stopped. To the first battery. Therefore, since the power supply is not interrupted, the power of the electronic device is kept on and the call is continued.</p>

Hereinafter, a power supply device and an electronic device, for example, a mobile phone, which is an embodiment of the present invention, will be described with reference to FIGS. 1 and 2.

(Rough configuration of power line for mobile phone) The configuration of the power line for the mobile phone will be described with reference to FIG. The main body (housing) 11 of the mobile phone 10 and the battery unit 40 are detachably connected (connected). For example, the battery unit 40 can be attached to or detached from the main body 11 by sliding the battery unit 40 with respect to the main body 11. Here, the mobile phone 10 includes a central control unit (CPU) 12, a power supply circuit 24, a first charging circuit 26, a built-in battery 28 which is a first battery, a changeover switch 30, and a connection terminal 32. And have. On the other hand, the battery unit 40 and the AC adapter 60 are configured to be connectable. Since the AC adapter 60 is a general product on the market, detailed description thereof will be omitted.

(Structure of Battery Unit) The battery unit 40 includes a second charging circuit 42, an external battery 44 which is a second battery, connection terminals 46 and 48, and a detection switch 50. The connection terminal 46 is the first connection means, and the connection terminal 48 is the second connection means.

The connection terminal 46 has a structure that can be connected to the connection terminal 62 of the AC adapter 60. The connection terminal 46 is an input terminal that inputs (supplies) the charging power from the AC adapter 60 to the battery unit 40. On the other hand, the connection terminal 48 is an output terminal that supplies the charging power from the AC adapter 60 to the mobile phone 10 via the battery unit 40. The connection terminal 48 has a structure that can be connected to the connection terminal 32 of the mobile phone 10.

The charging circuit 42 is a circuit that controls the charging voltage and charging current of the external battery 44. The charging circuit 42 is connected between the connection terminal 46 and the external battery 44. The external battery 44 is a rechargeable secondary battery, and is charged by the charging power from the AC adapter 60. The charging circuit 42 independently performs charging control processing and does not require control of the central control device 12 of the mobile phone 10. Therefore, even if the battery unit 40 is not connected to the mobile phone 10, if the AC adapter 60 is connected to the battery unit 40, the external battery 44 is charged.

(Structure of Mobile Phone) As described above, the mobile phone 10 includes a central control device 12, a power supply circuit 24, a charging circuit 26, a built-in battery 28, a changeover switch 30, and a connection terminal 32. The charging circuit 26 is connected between the connection terminal 32 and the built-in battery 28, and outputs (supplies) the charging power from the AC adapter 60 to the built-in battery 28. That is, the built-in battery 28 is a rechargeable secondary battery, and the charging power from the AC adapter 60 is charged to the built-in battery 28 via the charging circuit 26.

The connection terminal 32 can be connected to the output terminal of the AC adapter 60, and can also be connected to the connection terminal 48 of the battery unit as described above. That is, the charging power from the AC adapter 60 is supplied to the built-in battery 28 via the connection terminal 32 and the charging circuit 26. The connection terminal 62 of the AC adapter 60 has a structure that can be connected to both the connection terminal 46 of the battery unit 40 and the connection terminal 32 of the main body 11.

The central control device 12 includes a control circuit 14, a connection detection circuit (first detection circuit) 16, a second detection circuit 18, a third detection circuit 20, and a battery switching circuit 22. .. The connection detection circuit 16 is a circuit that detects the attachment / detachment state of the battery unit 40 with respect to the main body 11 of the mobile phone 10. The second detection circuit 18 is a detection circuit that detects the voltage of the built-in battery 28, and constitutes a second detection means. The third detection circuit 20 is a detection circuit that detects the voltage of the external battery 44 mounted on the battery unit 40, and constitutes a third detection means.

A changeover switch 30 is connected between the output terminals of the internal battery 28 and the external battery 44 and the power supply circuit 24. The battery changeover circuit 22 of the central control device 12 is connected to the changeover switch 30, and switches between the built-in battery 28 and the external battery 44 as power sources. The voltage lines VL1 and VL2 are connected to the external battery 44 and the changeover switch 30. Then, as shown in FIG. 2, the voltage lines VL1 and VL2 are connected via the connection terminals 45 and 31 by connecting the battery unit 40 to the main body 11. Therefore, the electric power of the external battery 44 is supplied to the power supply circuit 24 via the changeover switch 30.

When the battery unit 40 is not connected to the main body 11 of the mobile phone 10, power is supplied to the power supply circuit 24 and the like by the built-in battery 28. When the battery unit 40 is connected to the main body 11, power is supplied to the power supply circuit 24 or the like by either the external battery 44 or the built-in battery 28. Further, the built-in battery 28 is in a rechargeable state by connecting the AC adapter 60 to the connection terminal 32 of the mobile phone 10. Further, when the battery unit 40 to which the AC adapter 60 is connected is connected to the main body 11, the built-in battery 28 becomes rechargeable.

As shown in FIG. 1, the control circuit 14 of the central control device 12 controls the overall operation of the mobile phone 10, for example, battery switching based on the detection results of the second detection circuit 18 and the third detection circuit 20. Controls circuit 22. That is, when the third detection circuit 20 detects that the voltage of the external battery 44 is equal to or less than the threshold value, the control circuit 14 switches the changeover switch 30 by controlling the battery changeover circuit 22. Perform processing.

A storage unit 38 is connected to the control circuit 14. The storage unit 38 has a program for performing various processes and a storage area (including a work area) for reading and writing various data. Then, the data from the control circuit 14 (data such as the detection results of the detection circuits 16, 18 and 20) is stored in the storage unit 38. On the other hand, the data stored in the storage unit 38 is output to the control circuit 14.

The power supply circuit 24 is connected to the central control device 12 and the like, and is wired so that power can be supplied to each component such as the central control device 12. Note that in FIG. 1, the wiring of the power supply circuit 24 and the like is not shown. This is to prevent complications when connecting a plurality of wirings to each circuit or the like.

The mobile phone 10 includes a wireless circuit (not shown), an input device including a power key or a numeric keypad, a display, a microphone, a speaker, and the like. Then, the mobile phone 10 transmits / receives a signal via a wireless circuit.

(Connection detection configuration in the battery unit) A lock mechanism for locking the battery unit 40 with respect to the main body 11 is arranged in the main body 11 of the battery unit 40 and the mobile phone 10. This lock mechanism includes a lock key 49 slidably arranged in the battery unit 40, and a groove (not shown) for locking a claw (not shown) of the lock key 49. This lock mechanism is a mechanism that prevents the battery unit 40 from being detached from the main body 11 when a load (impact) is applied to the mobile phone 10 or the like.

The groove is formed in the portion of the main body 11 corresponding to the claw of the lock key 49. Then, the battery unit 40 is locked to the main body 11 by locking the lock key 49 in the groove of the main body 11. When the battery unit 40 is attached to the main body 11, the lock key 49 locks in a groove (not shown), while when the battery unit 40 is removed, the lock key 49 is slid to release the lock mechanism. It is configured to do.

Further, the lock key 49 slides between the solid line and the alternate long and short dash line in FIG. 1 with respect to the terminals Ta to Tc of the detection switch 50. When the lock key 49 is stopped at the solid line position (the detection switch 50 is in the open circuit state), it is connected to the terminals Ta and Tb. The terminal Ta is connected to the connection detection circuit 16 of the central control device 12. Terminal Tb is grounded.

Signal lines SL1 and SL2 are connected to terminal Ta and the connection detection circuit 16. Then, as shown in FIG. 2, the signal lines SL1 and SL2 are connected via terminals 54 and 36 by locking the battery unit 40 to the main body 11. Therefore, the terminal Ta and the connection detection circuit 16 are connected via the signal lines SL1 and SL2.

On the other hand, in the state where the lock key 49 is stopped at the position of the alternate long and short dash line (the detection switch 50 is in the closed circuit state), it is connected to the terminals Tb and Tc. The detection switch 50 of the present embodiment is an example of a 3-contact type, but the same can be applied to a 2-contact type, for example.

A pull-up resistor 34 is connected between the signal line SL2 and the voltage line VL3 of the power supply circuit 24. The pull-up resistor 34 generates and stabilizes the output voltage (HIGH signal and LOW signal) when the detection switch 50 is on or off.

Then, when the battery unit 40 is not connected to the main body 11 of the mobile phone 10, the voltage of the voltage line VL3 is supplied to the connection detection circuit 16 via the pull-up resistor 34, so that the connection detection circuit 16 is ". Detects a HIGH signal. Even when the detection switch 50 is off (in the state shown by the alternate long and short dash line in FIG. 1), the lock key 49 is connected to the terminals Tb and Tc, so that the connection detection circuit 16 detects the "HIGH" signal. ..

On the other hand, when the battery unit 40 is connected to the main body 11 of the mobile phone 10, that is, when the detection switch 50 is on (the state shown by the solid line in FIG. 1), the lock key 49 is connected to the terminals Ta and Tb. There is. Therefore, since the terminal Tb is grounded, the connection detection circuit 16 detects the LOW signal.

That is, a "HIGH" signal and a "LOW" signal, which are detection signals (corresponding to the slide of the lock key 49) according to the attachment / detachment state of the battery unit 40 with respect to the main body 11, are input to the connection detection circuit 16. Therefore, the connection detection circuit 16 detects the attachment / detachment state of the battery unit 40 with respect to the main body 11 based on the detection signal.

(Operation of the present embodiment) Next, the process related to the battery switching mode will be described with reference to FIG. FIG. 3 is a flowchart showing a processing routine executed by the control circuit 14 of the mobile phone 10. The program related to this processing routine is stored in advance in the program area of the storage unit 38.

Further, the flowchart shown in FIG. 3 is executed after the power switch (not shown) of the mobile phone 10 is turned on by the user and when the voltage of the built-in battery 28 shown in FIG. 1 is 3.0 (Volt) or more. It is a process. That is, the mobile phone 10 is set to start up (start up) and be initialized based on the voltage of the built-in battery 28. Therefore, when the voltage of the built-in battery 28 is, for example, 3.0 (Volt) or less, power is not supplied to the central control device 12 even if the power switch is turned on, so this flowchart does not start.

(Battery switching mode) As shown in FIG. 3, in step 100, the control circuit 14 of the central control device 12 shown in FIG. 1 has a battery unit 40 with respect to the main body 11 of the mobile phone 10 based on the detection result of the connection detection circuit 16. Judge whether or not there is a connection. That is, when a "LOW" signal (detection signal) is input to the connection detection circuit 16, the control circuit 14 has the battery unit 40 mounted on the main body 11 (in a connected state) as shown in FIG. Judge. On the other hand, when a "HIGH" signal (detection signal) is input to the connection detection circuit 16, the control circuit 14 has the battery unit 40 removed from the main body 11 (in a detachable state) as shown in FIG. Judge.

If step 100 is negative, that is, if the battery unit 40 is not connected to the main body 11, in step 102, the control circuit 14 shown in FIG. 1 has the built-in battery 28 based on the detection result of the second detection circuit 18. Determine if the voltage of is above the threshold. That is, the second detection circuit 18 shown in FIG. 1 detects (measures) the voltage of the built-in battery 28. Then, the control circuit 14 as a determination means compares the threshold value (for example, 3.4 Volt) stored in the storage unit 38 shown in FIG. 1 with the detected voltage of the built-in battery 28. The threshold value is a voltage at which the power of the built-in battery 28 is reduced and the power is turned off by software.

Then, when step 102 is negative, that is, when the voltage of the built-in battery 28 is 3.4 (Volt) or less, in step 104, the control circuit 14 displays "Built-in battery is Low Battery" (not shown) for a predetermined time. Display on the device. After that, the control circuit 14 ends this flowchart by turning off the power supply in step 106. The warning method for "the built-in battery is Low Battery" is not limited to the display by a display device (not shown), or voice data may be output as an alarm alarm from a speaker (not shown).

If step 102 is affirmative, that is, if the voltage of the built-in battery 28 is 3.0 (Volt) or higher, the process returns to step 100 and the built-in battery 28 is used as a power source. That is, as shown in FIG. 2, the control circuit 14 executes the processes after step 100 until the battery unit 40 (external battery 44) is connected to the main body 11.

If step 100 is affirmative, that is, if the battery unit 40 is connected (mounted) to the main body 11, in step 108, the control circuit 14 determines whether or not the voltage of the external battery 44 is equal to or higher than the threshold value. That is, the third detection circuit 20 shown in FIG. 1 detects (measures) the voltage of the external battery 44. Then, the control circuit 14 as a determination means compares the threshold value (for example, 3.4 Volt) stored in the storage unit 38 shown in FIG. 1 with the detected voltage of the external battery 44.

Then, when step 108 is negative, that is, when the voltage of the external battery 44 is 3.4 (Volt) or less, in step 110, the control circuit 14 displays "external battery is low battery" for a predetermined time (not shown). Display on the device. After that, the control circuit 14 proceeds to step 102 and executes the processes after step 102.

If step 108 is affirmative, that is, if the voltage of the external battery 44 is 3.4 (Volt) or higher, in step 112, the control circuit 14 switches the changeover switch 30. That is, the control circuit 14 switches the battery used as a power source from the built-in battery 28 to the external battery 44 by outputting a control signal to the changeover switch 30. Then, after the process of step 112, the process returns to step 100, and the processes after step 100 are executed. For example, as shown in FIG. 1, the external battery 44 is used as a power source until the external battery 44 falls below the threshold value. Further, the external battery 44 is used as a power source until the battery unit 40 (external battery 44) is removed from the main body 11.

In the present embodiment, the second detection means 18 and the third detection means 20 detect the voltage of the built-in battery 28 and the voltage of the external battery 44, so that the control circuit which is a judgment means during use of the mobile phone 10 14 switches the battery to be used as a power source based on the detection result according to the battery voltage. That is, according to the present embodiment, both the external battery 44 and the built-in battery 28 can be used up until the remaining battery level is exhausted, so that the mobile phone 10 can be used for a long time. For example, as the built-in battery 28, a battery having a small capacity, that is, a battery having a small volume can be used, so that the mobile phone 10 can be made smaller and thinner, and the degree of freedom in design in the outer shape is increased. It gets higher.

Next, a case where the built-in battery 28 or the external battery 44 is charged using the AC adapter 60 will be described. In addition, in FIG. 3, the charging process is performed regardless of which process is in progress. That is, the charging process can be freely charged even when the mobile phone 10 is operating (communication).

As a charging method, there are charging methods 1 to 3. The charging method 1 is a case where the AC adapter 60 is directly connected to the mobile phone 10 to charge the built-in battery 28 of the mobile phone 10. The charging method 2 is a case where the AC adapter 60 is connected to the battery unit 40 and the external battery 44 of the battery unit 40 is charged. In the charging method 2, the battery unit 40 is not attached to the main body 11. The charging method 3 is a case where the AC adapter 60 is connected to the battery unit 40 and the battery unit 40 is attached to the mobile phone 10 to charge the internal battery 28 of the mobile phone 10 and the external battery 44 of the battery unit 40.

In the charging method 1, the connection terminal 62 of the AC adapter 60 is directly connected to the connection terminal 32 of the mobile phone 10 to charge the built-in battery 28 of the mobile phone 10. The charging power from the AC adapter 60 is controlled by the central controller 12 and the charging circuit 26. When the mobile phone is in operation, the charging circuit 26 supplies power to the power supply circuit 24 of the mobile phone 10 and also supplies charging power to the built-in battery 28. When the mobile phone 10 is not in use (when the power is off), only the built-in battery 28 is charged. When charging is completed, the character data of "charging completed" is displayed on a display device (not shown). On the other hand, when the mobile phone 10 is operating, the charging circuit 26 does not supply power to the power supply circuit 24, and the built-in battery 28 supplies power to the power supply circuit 24.

In the charging method 2, the connection terminal 62 of the AC adapter 60 is connected to the connection terminal 46 of the battery unit 40, and the external battery 44 of the battery unit 40 is charged. The charging power from the AC adapter 60 is controlled by the charging circuit 42. The charging circuit 42 detects that there is no power supply to the mobile phone 10 and also detects the charging power from the AC adapter. Then, the charging circuit 42 supplies charging power to the external battery 44 and charges the external battery 44.

In the charging method 3, the connection terminal 62 of the AC adapter 60 is connected to the connection terminal 46 of the battery unit 40, and the connection terminal 48 of the battery unit 40 is connected to the connection terminal 32 of the mobile phone 10. That is, the above connection state is a state in which the battery unit 40 is mounted on the main body 11. The charging current from the AC adapter is supplied to the battery unit 40 and the mobile phone 10. In the charging method 3, the built-in battery 28 of the mobile phone 10 is preferentially charged. The charging power from the AC adapter is first supplied to the charging circuit 26 of the mobile phone 10, and the built-in battery 28 is charged by the same procedure as in the charging method 1. When the charging of the internal battery 28 is completed, the charging of the external battery 44 is started.

When the charging circuit 42 detects that there is no power supply to the mobile phone 10 in the battery unit 40, it supplies charging power to the external battery 44 to charge the battery unit 44. When the mobile phone 10 is powered by the external battery 44, a part of the charging power is supplied as the power circuit 24 of the mobile phone 10. When the charging of the external battery is completed, the character data of "charging completed" is displayed on a display device (not shown).

In the present embodiment, the external battery 44 or the built-in battery 28 is switched or charged by the control circuit 14, the battery switching circuit 22, the charging circuit 26, and the like even during the operation of the mobile phone 10, for example, during a call. , The mobile phone 10 can be used for a long time.

Subsequently, with reference to FIG. 4, the processing related to the connection detection mode in the battery unit will be described. FIG. 4 is a flowchart showing a processing routine executed by the control circuit 14 of the mobile phone 10. The program related to this processing routine is stored in advance in the program area of the storage unit 38. Further, the flowchart shown in FIG. 4 shows a state in which a call or the like of the mobile phone 10 is being processed and the external battery 44 or the built-in battery 28 is used as a power source (the state in which the battery unit 40 shown in FIG. 2 is attached). This is the process to be executed.

(Connection Detection Mode in Battery Unit) As shown in FIG. 4, in step 200, the control circuit 14 of the central control device 12 shown in FIG. 2 determines whether or not the detection switch 50 is switched from on to off. For example, when the lock key 49 (see FIG. 2) is slid by a user or the like from the position shown by the solid line to the position shown by the alternate long and short dash line, the detection switch 50 is switched from on to off in conjunction with the lock key 49.

When the detection switch 50 is switched from on to off, the detection signal input to the connection detection circuit 16 is switched from the "HIGH" signal to the "LOW" signal. Therefore, as shown in FIG. 1, the control circuit 14 determines that the battery unit 40 is in the pre-stage of being removed from the main body 11.

In step 200, it waits for the detection switch 50 to switch from on to off. On the other hand, if step 200 is affirmative, that is, if the detection switch 50 does not switch from on to off, in step 202, the control circuit 14 shown in FIG. 2 determines whether or not the power source of the mobile phone 10 is the built-in battery 28. to decide. That is, the control circuit 14 reads the current switching direction of the changeover switch 30 from the storage unit 38 and determines.

If step 202 is affirmative, that is, if the power source of the mobile phone 10 is the built-in battery 28, this flowchart ends. On the other hand, when step 202 is negative, that is, when the power source of the mobile phone 10 is the external battery 44, in step 204, the control circuit 14 switches the battery used as the power source from the built-in battery 28 to the external battery 44. That is, the control circuit 14 switches the changeover switch 30 by outputting a control signal to the changeover switch 30. This flowchart ends when the battery used as the power source is switched from the built-in battery 28 to the external battery 44.

Then, in the present embodiment, since the power source of the mobile phone 10 is the built-in battery 28 in the unlocked state of the lock key 49, the subsequent removal stage (the stage in which the battery unit 40 is removed from the main body 11). Even in the above case, the power supply of the mobile phone 10 is not interrupted, and the call and the like continue.

That is, in the present embodiment, a state in which a call or the like of the mobile phone 10 is being processed (the mobile phone 10 is in use) and an external battery 44 is used as a power source (a state in which the battery unit 40 shown in FIG. 2 is attached). In the operation of removing the battery unit 40 from the main body 11 of the mobile phone 10, for example, the lock key 49 is unlocked. When the lock key 49 is unlocked, a "HIGH" signal (detection signal) is input to the connection detection circuit 16 before the power supply of the external battery 44 is stopped, so that the control circuit 14 is connected. Based on the detection result of the detection circuit 16, it is determined that the battery unit 40 is in the removed state before being completely removed from the main body 11.

Therefore, the control circuit 14 switches the power supply from the external battery 44 to the built-in battery 28 via the battery switching circuit 22. That is, according to the present embodiment, since the power supply switching process is performed in the above-mentioned removed state after the unlocking operation of the lock key 49, the power-on state is maintained without interrupting the power supply in the mobile phone 10. It will be maintained and calls will continue.

The connection detection means in the battery unit 40 shown in FIG. 1 is performed before the battery unit 40 is actually removed from the main body 11 by operating the lock key 49 before the battery unit 40 is removed from the main body 11 (in advance). , This is an example of setting the power supply of the mobile phone 10 to the built-in battery 28.

Next, FIG. 5 shows a modified example of the connection detecting means in the battery unit 40. The sensor 56 constitutes a part of the connection detecting means, and includes a light emitting element 56A and a light receiving element 56B. As shown in FIG. 5, the light emitting element 56A is arranged on the battery unit 40 side. On the other hand, the light receiving element 56B is arranged on the main body 11 side and is connected to the connection detection circuit 16 shown in FIG. The removal of the battery unit 40 with respect to the main body 11 is an example in which the battery unit 40 is slid with respect to the main body 11 and then moved in a direction orthogonal to the sliding direction.

When the battery unit 40 is mounted on the main body 11, as shown in FIG. 5, the light emitted from the light emitting element 56A is received by the light receiving element 56B. When the light receiving element 56B receives the light emitted from the light emitting element 56A, the light receiving element 56B outputs a detection signal to the connection detection circuit 16 (see FIG. 1). Therefore, the connection detection circuit 16 detects that the battery unit 40 is mounted on the main body 11.

Further, when the battery unit 40 is mounted on the main body 11, the connection terminals 58A and 58B connected to the voltage lines VL1 and VL2 are connected. In the state shown in FIG. 5, the connection terminal 58A is connected so as to be located on one end side of the connection terminal 58B. Therefore, the electric power of the external battery 44 shown in FIG. 1 is supplied to the power supply circuit 24 via the changeover switch 30.

On the other hand, as shown in FIG. 6, for example, when the battery unit 40 is slid with respect to the main body 11 in the direction of the arrow A, the battery unit 40 is removed from the main body 11. Then, in the removed state (the state shown in FIG. 6) before the battery unit 40 is completely removed from the main body 11, the light emitting element 56A and the light receiving element 56B do not face each other, so that the light receiving element 56B emits light. The light emitted from element 56A is not received. Therefore, the connection detection circuit 16 shown in FIG. 1 detects that the battery unit 40 is in the stage before being removed from the main body 11.

Further, the connection terminals 58A and 58B connected to the voltage lines VL1 and VL2 are also connected to the main body 11 even in the moving stage before the battery unit 40 is removed. In the state shown in FIG. 6, the connection terminal 58A is connected so as to be located on the other end side of the connection terminal 58B. Therefore, the electric power of the external battery 44 shown in FIG. 1 is supplied to the power supply circuit 24 via the changeover switch 30.

That is, the connection terminals 58A and 58B have the voltage lines VL1 and VL2 of the external battery 44 connected to the power supply circuit 24 of the main body 11 (see FIG. 1) over the moving stage before the battery unit 40 is removed from the main body 11. ) Is configured to stay connected. Then, in the moving stage of the battery unit 40 (the stage shown in FIG. 6), the control circuit 14 shown in FIG. 1 switches the power supply of the electronic device 10 from the external battery 44 to the built-in battery 28 via the battery switching circuit 22.

To remove the battery unit 40 from the main body 11, slide the battery unit 40 in the direction of arrow A and then move it in the direction orthogonal to the sliding direction (direction of arrow A) (direction of arrow B). Therefore, the slide of the battery unit 40 in the direction of arrow A corresponds to before the removal step (removal state). Then, the subsequent movement of the battery unit 40 in the direction of arrow B is an operation of actually removing the battery unit 40 from the main body 11.

The modified example shown in FIG. 5 eliminates the need for operations such as the lock key 49 shown in FIG. 1, which improves usability. Since other configurations and actions and effects are the same as those of the embodiment shown in FIG. 1, detailed description thereof will be omitted. The processing of the connection detection mode in the battery unit is the same as in FIG. That is, in step 200, the same processing is executed except that the on / off of the switch 50 (see FIG. 1) becomes the detection signal (on signal or off signal) of the light receiving element 56B.

In the modified example shown in FIG. 5, the configurations of the sensor 56 and the connection terminal 58 can be arbitrarily changed, and the operation of removing the battery unit 40 from the main body 11 is a configuration in which the battery unit 40 is simply slid in one direction. May be. Further, the processing flow of each program described in the above embodiment (see FIGS. 3 and 4) is an example, and can be appropriately changed within a range that does not deviate from the gist of the present invention. For example, in the flowchart shown in FIG. 3, when the external battery 44 is connected, even if the voltage of the built-in battery 28 is equal to or less than the threshold value of 3.0 (Volt), if the voltage of the external battery 44 is equal to or higher than the threshold value. The process shown in FIG. 3 may be started by the power of the external battery 44.

Further, the pattern to be combined in the present invention may be, for example, a pattern in which two examples or two or more examples are combined among the above-described embodiments or modifications. For example, the built-in battery 28 or the external battery 44 does not necessarily have to be a rechargeable secondary battery, and can be similarly applied to a primary battery or the like.

Further, the mobile phone 10 of the present embodiment has a built-in battery 28 which is a rechargeable first battery, a main body 11 of the mobile phone 10 on which the built-in battery 28 is arranged, and a battery which is detachably arranged with respect to the main body 11. Before the unit 40, the external battery 44, which is the second battery arranged in the battery unit 40, and the mobile phone 10 are turned off, and before the battery unit 40 is completely removed from the main body 11. When the first detection means (connection detection circuit 16) for detecting the detached state and the connection detection circuit 16 detect the detached state in the battery unit 40 and the main body 11, the power supply of the mobile phone 10 is supplied from the external battery 44 to the built-in battery. It is a device including a control means (control circuit 14) for switching and controlling to 28.

Further, the power supply device of the present embodiment includes a built-in battery 28 which is a first battery arranged in the main body 11 of the mobile phone 10, a battery unit 40 which is detachably arranged with respect to the main body 11, and a battery unit 40. The first, which detects the removed state of the external battery 44, which is the second battery to be arranged, and the battery unit 40 before the battery unit 40 is completely removed from the main body 11 before the power of the mobile phone 10 is turned off. When the detection means (connection detection circuit 16) and the connection detection circuit 16 detect the detached state of the battery unit 40 and the main body 11, the power supply of the mobile phone 10 is switched from the external battery 44 to the built-in battery 28 and controlled (control means). It is a device including a control circuit 14).

In the present embodiment, the power supply device is incorporated into the mobile phone 10. In the present invention, the power supply device may be configured to be incorporated in an electronic device such as a personal computer or a PDAs. That is, the electronic device according to the present invention is a concept including, for example, a mobile phone, a personal computer, a PDAs, and the like.

<figref num="1">It is a block diagram of the power supply device which concerns on one Embodiment of this invention.</figref><figref num="2">It is a conceptual diagram in which the battery unit shown in FIG. 1 is attached to the main body of a mobile phone.</figref><figref num="3">FIG. 5 is a flowchart of a battery switching mode of the power supply device shown in FIG.</figref><figref num="4">It is a flowchart of the attachment / detachment detection mode in the battery unit shown in FIG.</figref><figref num="5">It is the schematic about the other modification of the connection detection means shown in FIG.</figref><figref num="6">It is a figure explaining the state of connection detection when the battery unit shown in FIG. 5 slides.</figref>

Code description

10 Mobile phone (electronic device) 11 Main body of mobile phone 12 Central control device 14 Control circuit (control means) 16 Connection detection circuit (first detection means) 18 Second detection circuit (second detection means) 20 Third Detection circuit (third detection means) 22 Battery switching circuit (control means or switching means) 24 Power supply circuit 26 Charging circuit (first charging circuit) 28 Built-in battery (first battery) 30 Changeover switch (switching means) 34 Pull-up resistor 38 Storage unit 40 Battery unit 42 Charging circuit (second charging circuit) 44 External battery (second battery) 49 Lock key (locking means) 50 Detection switch 60 AC adapter SL1, SL2 Signal line VL1, VL2 Voltage line