JP2007020335A - Power supply device of electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply stable electric power to an electronic apparatus, by effectively using batteries that are mounted to and detached from a power supply device, in the power supply device of the electronic apparatus, on which a plurality of the batteries can be mounted. <P>SOLUTION: The power supply device of the electronic apparatus that comprises a battery portion, where a plurality of batteries that supply electric power to the electronic apparatus can be mounted to and removed from, a control device that controls the outputs of a plurality of the batteries and detects whether the batteries are inserted into the battery portion, a voltage detection portion that detects the voltages of a plurality of the batteries, and a display portion that displays the state of the battery voltages detected by the voltage detection portion. The control device is configured, capable of simultaneously recognizing a plurality of the batteries, immediately after the insertion of the batteries, and battery voltage is supplied from a battery, when insertion of a plurality of the batteries are recognized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply device for electronic equipment.

A power supply device for a conventional electronic device will be described.
When multiple batteries are installed in a power supply device for an electronic device having multiple battery storage units, multiple battery outputs are connected in parallel via a backflow prevention diode, and the battery output on the high potential side is connected to the electronic device. There is technology to supply.
In this technique, the battery on the high potential side is alternately switched in the process of battery consumption, so that the output of the plurality of batteries is reduced evenly and the remaining battery level is almost eliminated. For this reason, in order to charge the exhausted battery, a plurality of batteries must be charged simultaneously.

When using a plurality of batteries, one battery is usually used, and when the remaining battery level is detected, the battery is temporarily switched to the other battery for detection. Thereby, the remaining battery level can be detected accurately. In addition, regarding the battery slot of a battery that is currently in use, when a lid opening / closing is detected, a plurality of batteries are temporarily connected in parallel using a backflow prevention diode, so that the battery output can be continuously supplied and data in the electronic device Can be saved (see Patent Document 1).
JP-A-8-336243

The above-described prior art is an electronic device in the case where the remaining battery power is exhausted when power is supplied from one battery in a state where a plurality of batteries are mounted, and when the battery currently in use is instantaneously removed. The stability of the power supply to the city becomes a problem.
In addition, when only one battery is inserted, it is necessary to improve the supply of battery output when the other battery is suddenly inserted.

  An object of the present invention is to provide an electronic device that can supply a stable power to an electronic device by effectively using a battery attached to and detached from the power supply device in a power supply device for an electronic device to which a plurality of batteries can be attached. It is to provide a power supply apparatus.

  The electronic device power supply device according to claim 1, wherein a plurality of batteries for supplying and removing power to the electronic device are detachable, and the outputs of the plurality of batteries are controlled, and the batteries are inserted into the battery units. In a power supply device for an electronic device having a control unit that detects whether or not, a voltage detection unit that detects battery voltages of a plurality of batteries, and a display unit that displays a state of the battery voltage detected by the voltage detection unit, The control unit is configured to be able to simultaneously recognize a plurality of batteries immediately after the battery is inserted, and supplies a battery voltage from one battery when recognizing that a plurality of batteries are inserted.

The electronic device power supply device according to claim 2 is the electronic device power supply device according to claim 1, wherein the voltage detection unit detects that the battery voltage of one battery is lower than a predetermined voltage. The control unit switches the battery voltage supply source to another battery.
The electronic device power supply device according to claim 3 is the electronic device power supply device according to claim 1, wherein when the control unit detects that one battery is removed from the battery unit, the control unit supplies the other battery to the other battery. The battery voltage supply source is switched.

  The electronic device power supply device according to claim 4 is the electronic device power supply device according to claim 1, wherein the voltage detection unit detects that the voltage of all of the plurality of battery voltages is below a predetermined voltage. The control unit is capable of supplying voltages from a plurality of batteries, further prohibiting a predetermined operation, and displaying a warning that there is no remaining battery power on the display unit.

  The power supply device for an electronic device according to claim 5, wherein a plurality of batteries for supplying / removing electric power to the electronic device are removable, and the outputs of the plurality of batteries are controlled, and the batteries are inserted into the battery portions. In a power supply device for an electronic device having a control unit that detects whether or not, a voltage detection unit that detects battery voltages of a plurality of batteries, and a display unit that displays a state of the battery voltage detected by the voltage detection unit, When one battery is inserted into the battery unit and one battery voltage is supplied to the electronic device, the control unit selects one of the batteries when the other battery is inserted. A battery voltage is supplied to the electronic device.

  The power supply device for an electronic device according to claim 6, wherein a plurality of batteries for attaching and detaching a battery for supplying electric power to the electronic device, the outputs of the plurality of batteries are controlled, and the batteries are inserted into the battery portions. A control unit for detecting whether or not, a battery remaining amount detecting unit for detecting remaining battery levels of a plurality of batteries mounted on the plurality of battery units, and a state of a battery voltage detected by the remaining battery level detecting unit are displayed. In a power supply apparatus for an electronic device having a display unit, the control unit is configured to be able to recognize a plurality of batteries at the same time immediately after the battery is inserted, and the battery voltage from one battery when recognizing that the plurality of batteries are inserted. It is characterized by supplying.

The power supply device for an electronic device according to claim 7 is the power supply device for an electronic device according to claim 6, wherein the remaining battery level detection circuit detects that the remaining battery level of one battery has run out. The battery voltage supply source is switched to another battery.
The power supply device for an electronic device according to claim 8 is the power supply device for electronic device according to claim 6, wherein when the control unit detects that one battery is removed from the battery unit, The battery voltage supply source is switched.

  The electronic device power supply device according to claim 9 is the electronic device power supply device according to claim 6, wherein the remaining battery level detection unit detects that the remaining battery level has been exhausted for all of the plurality of battery voltages. In this case, the control unit can supply a voltage from a plurality of batteries, further prohibits a predetermined operation, and displays a warning that the battery is low on the display unit.

  A power supply device for an electronic device according to claim 10, wherein a plurality of batteries for supplying and removing power for supplying power to the electronic device are controlled, the outputs of the plurality of batteries are controlled, and the batteries are inserted into the battery portions. A control unit for detecting whether or not, a battery remaining amount detecting unit for detecting remaining battery levels of a plurality of batteries mounted on the plurality of battery units, and a state of a battery voltage detected by the remaining battery level detecting unit are displayed. In a power supply device for an electronic device having a display unit, the control unit inserts the other battery when one battery is inserted into the battery unit and one battery voltage is supplied to the electronic device. In this case, after the remaining battery level is detected by the remaining battery level detection unit, any one battery is selected according to the detected remaining battery level, and the battery voltage is supplied to the electronic device. .

  According to the present invention, in an electronic device power supply apparatus to which a plurality of batteries can be mounted, an electronic device that makes it possible to effectively use a battery attached to and detached from the power supply device and supply stable power to the electronic device. A power supply apparatus can be provided.

Hereinafter, embodiments of the present invention will be described.
(First embodiment)
FIG. 1 is a circuit diagram showing a first embodiment of the present invention.
In FIG. 1, 10 is an electronic device, 20 is a power supply unit, 11 is a microcomputer (hereinafter referred to as a microcomputer), 12 is a DC / DC circuit, 13 is a voltage detection circuit, 14 is a display unit, 21 is a reference voltage, A and B are removable batteries, SW1 and SW2 are battery detection switches, U1 and U2 are comparators, U3 and U4 are AND circuits, U5 and U6 are NAND circuits, Q1 and Q3 are P-channel MOS transistors (hereinafter referred to as PchMOS). Q2 and Q4 are N-channel MOS transistors (hereinafter referred to as NchMOS), D1 and D2 are diodes, and R1 to R10 are resistors. The switches SW1 and SW2 are turned on when the batteries A and B are inserted, respectively, and turned off when the batteries are removed.

First, the circuit operation when only the fully charged battery A is inserted will be described.
Immediately after the insertion of the battery A, the output of the comparator U1 is divided by the resistors R1 and R2 between the reference voltage 21 of the comparator input to the − terminal and the output voltage (+ side) of the battery A input to the + terminal. The voltage is compared, and as a result, the L level is changed to the H level. Here, the reference voltage 21 of the comparator is a voltage output from a regulator (not shown) or the like. Further, when the battery A is inserted, the battery detection switch SW1 is turned on.

  The NAND circuit U6 outputs an H level based on the L level pulled down to GND by the resistor R5 and the L level output from the comparator U2. Accordingly, the output of the AND circuit U3 becomes H level, the NchMOS Q2 is turned on, and the PchMOS Q1 is turned on, whereby the voltage of the battery A is supplied to the electronic device 10. Resistors R7 and R9 stabilize the gate potential of NchMOS Q2 and PchMOS Q1, respectively, and diodes D1 and D2 are reverse current prevention diodes.

The voltage of the battery A supplied to the electronic device 10 is made constant by the DC / DC circuit 12 and then supplied to the port VCC of the microcomputer 11. When the microcomputer 11 is in a stable operation state, the port P1 (L level is input) detects that the battery detection switch SW1 is turned on. Thereby, the microcomputer 11 recognizes that the battery A is inserted.
When the microcomputer 11 recognizes that the battery A has been inserted, it outputs an L level from the port P3 (L is input to the NAND circuit U6) and simultaneously outputs an H level from the P4 port (H is input to the NAND circuit U5). . Therefore, thereafter, the output control of the battery A is stably performed, and the battery B is not inserted and is in an inoperative state.

The output voltage of the battery A is input to the port P5 via the voltage detection circuit 13, and the microcomputer 11 displays the voltage on the display unit 14 step by step.
Next, the circuit operation when only the fully charged battery B is inserted will be described. Immediately after the insertion of the battery B, the output of the comparator U2 is obtained by dividing the reference voltage 21 of the comparator input to the-terminal and the output voltage (+ side) of the battery B input to the + terminal by resistors R3 and R4. The voltage is compared, and as a result, the L level is changed to the H level. Further, when the battery B is inserted, the battery detection switch SW2 is turned on.

The NAND circuit U5 outputs an H level based on the L level pulled down to GND by the resistor R6 and the L level output from the comparator U1. Accordingly, the output of the AND circuit U4 becomes the H level, the NchMOS Q4 is turned on, and the PchMOS Q3 is turned on, whereby the voltage of the battery B is supplied to the electronic device 10.
The resistors R8 and R10 stabilize the gate potentials of the NchMOS Q2 and PchMOS Q1, respectively. The voltage of the battery B supplied to the electronic device 10 is made constant by the DC / DC circuit 12, and then the microcomputer 11 To the port VCC. When the microcomputer 11 is in a stable operation state, the port P2 (L level is input) detects that the battery detection switch SW2 is turned on. Thereby, the microcomputer 11 recognizes that the battery B is inserted.

When the microcomputer 11 recognizes that the battery B has been inserted, it outputs an H level from the port P3 (H is input to the NAND circuit U6) and simultaneously outputs an L level from the P4 port (L is input to the NAND circuit U5). . Therefore, thereafter, the output control of the battery B is stably performed, and the battery A is not inserted and is in an inoperative state.
The output voltage of the battery B is input to the port P5 via the voltage detection circuit 13, and the microcomputer 11 displays this voltage on the display unit 14 step by step.

Next, circuit operation when both the battery A and the battery B are inserted will be described.
The output voltage of the battery A is supplied to the electronic device 10 as in the case where only the battery A is inserted.
The output voltage of the battery B is supplied to the electronic device 10 because the output of the comparator U1 becomes H level but the output of the NAND circuit U5 becomes H level. Therefore, it will be in the state of simultaneous supply.

The battery voltage supplied to the electronic device 10 is made constant by the DC / DC circuit 12 and then supplied to the microcomputer 11.
When the microcomputer 11 becomes stable, the microcomputer 11 detects the level of the battery detection switch SW1 and the level of the battery detection switch SW2 at the ports P1 and P2, and recognizes that the batteries A and B are inserted.

  Thereby, for example, the microcomputer 11 outputs an L level from the port P3 and simultaneously outputs an H level from the port P4. As a result, the NAND circuit U5 outputs an L level in response to an H level output from the comparator U1 and an H level output from the port P4. Therefore, the AND circuit U4 outputs an L level, the NchMOS Q4 is turned off, the PchMOS Q3 is turned off, and the output voltage of the battery B is cut off. The battery voltage is input to the port P5 via the voltage detection circuit 13, and this voltage is displayed on the display unit 14 step by step.

The circuit operation when both the battery A and the battery B described above are inserted is an example, and other operation examples exist as will be described later.
FIG. 2 is a flowchart showing a first operation example of the microcomputer 11 in the first embodiment shown in FIG.
As shown in FIG. 2, when the microcomputer 11 detects the L level from the ports P1 and P2 in step S1, it recognizes that the batteries A and B are inserted.

In step S2, the port P3 is set to the L level and the port P4 is set to the H level, thereby continuing the supply of the output voltage of the battery A and cutting off the supply of the output voltage of the battery B7.
In step S3, the battery voltage of the battery A is determined based on the voltage level input to the port P5. When the voltage level of the port P5 is higher than the predetermined reference voltage, the voltage supply state by the battery A is maintained, and when the voltage level of the port P5 is lower than the predetermined reference voltage, the process proceeds to step S4.

In step S4, port P3 is set to H level and port P4 is set to L. Thereby, the supply of the output voltage of the battery A is cut off, and the supply of the output voltage of the battery B is started. That is, the voltage supply from the battery A is switched to the voltage supply from the battery B.
In step S5, the battery voltage of the battery B is determined based on the voltage level input to the port P5. When the voltage level of the port P5 is higher than the predetermined reference voltage, the voltage supply state by the battery B is maintained, and when the voltage level of the port P5 is lower than the predetermined reference voltage, the process proceeds to step S6.

  In step S6, by setting the port P3 to the L level and the port P4 to the L level, the output voltages of the battery A and the battery B are supplied to the electronic device 10 to simply operate the microcomputer 11 or It is possible to enable a minimum operation such as a warning that the amount is small. In this state, if the electronic device is a camera, for example, autofocus and release operations are prohibited.

FIG. 3 is a flowchart showing a second operation example of the microcomputer 11 in the first embodiment shown in FIG.
The same parts as those in the first operation example shown in FIG. The difference between the first operation example and the second operation example is that steps S11 to S14 are joined.

That is, if it is determined in step S3 that the voltage level of the port P5 is higher than the predetermined reference voltage, the process proceeds to step S11.
In step S11, it is determined whether or not the battery A or the battery B is removed. If it is determined that it has not been removed, the process returns to step S3, and the voltage supply state from the battery A is maintained. If it is determined that it has been removed, the process proceeds to step S12.

In step S12, it is determined whether the removed battery is A or B. If it is determined that the battery A has been removed, the process proceeds to step S13. If it is determined that the battery B has been removed, the process proceeds to step S14.
In step S13 (the removed battery is A), the H level of the port P1 and the L level of the port P2 are detected. In step S4, the port P3 is set to the H level and the port P4 is set to the L level. Thereby, the supply of the output voltage of the battery A is cut off, and the supply of the output voltage of the battery B is started. That is, the voltage supply from the battery A is switched to the voltage supply from the battery B.

In step S14 (extracted battery is B), the H level is detected from the port P1, and the L level is detected from the port P2, and then the process returns to step S3 to hold the voltage supply state from the battery A.
According to this operation example, even when one of the batteries A and B is removed, the battery can be switched smoothly. In step S6, the port P3 is set to the L level and the port P4 is set to the L level, so that the output voltages of the battery A and the battery B are supplied to the electronic device 10 to simply operate the microcomputer 11 or It is possible to enable a minimum operation such as a warning that the battery level is low. In this state, if the electronic device is a camera, for example, autofocus and release operations are prohibited.

FIG. 4 is a flowchart showing a third operation example of the microcomputer 11 in the first embodiment shown in FIG. In FIG. 4, the same parts as those in the first operation example shown in FIG. The difference between the first operation example and the third operation example is that steps S21 to S24 are joined.
That is, when it is determined in step S5 that the voltage level of the port P5 is higher than the predetermined reference voltage, the process proceeds to step S21.

In step S21, it is determined whether or not the battery A or the battery B is removed. If it is determined that the battery has not been removed, the process returns to step S5, and the voltage supply state from the battery B is maintained. If it is determined that it has been removed, the process proceeds to step S22.
In step S22, it is determined whether the removed battery is A or B. If it is determined that the battery A has been removed, the process proceeds to step S24. If it is determined that the battery B has been removed, the process proceeds to step S23.

In step S24 (the removed battery is A), the process returns to step S5, and the voltage supply state from the battery B is maintained.
In step S23 (the removed battery is B), L level is detected from the port P1, and H level is detected from the port P2. In step S6, the port P3 is set to L level and the port P4 is set to L level.

  According to this operation example, when the remaining battery level of the battery A is low and the battery B is removed, the port P3 is set to L level and the port P4 is set to L level in step S6. It is possible to supply the output voltage to the electronic device 10 to simply operate the microcomputer 11 or to allow the display unit 14 to perform a minimum operation such as a warning that the battery level is low. In this state, if the electronic device is a camera, for example, autofocus and release operations are prohibited.

  FIG. 5 is a flowchart showing a fourth operation example of the microcomputer 11 in the first embodiment shown in FIG. In FIG. 5, the same parts as those of the first operation example shown in FIG. The difference between the first operation example and the fourth operation example is that step S1 is changed to step S30, steps S4 and S5 are not provided, and steps S31 to S35 are added.

In step S30, the L level is detected from the port P1 and the H level is detected from the port P2, and the voltage supply from the battery A is enabled.
In step 3, the battery voltage of the battery A is determined based on the voltage level input to the port P5. When the voltage level of the port P5 is higher than the predetermined reference voltage, the process proceeds to step S31. When the voltage level of the port P5 is lower than the predetermined reference voltage, the process proceeds to step S6.

In step S31, it is determined whether or not the battery B has been inserted. If the battery B is not inserted, the process returns to step S3. If the battery B has been inserted, the process proceeds to step S32.
In step S32, the L level is detected from the port P1 and the L level is detected from the port P2, and it is recognized that both the batteries A and B are inserted.

In step S33, when the voltage level of the port P5 is higher than the predetermined reference voltage, the voltage supply state by the battery A is maintained, and when the voltage level of the port P5 is lower than the predetermined reference voltage, the process proceeds to step S34.
In step S34, the port P3 is set to H level and the port P4 is set to L level. Thereby, voltage supply from the battery B is started.

In step S35, when the voltage level of the port P5 is higher than the predetermined reference voltage, the voltage supply state by the battery B is maintained, and when the voltage level of the port P5 is lower than the predetermined reference voltage, the process proceeds to step S6.
According to this operation example, when the remaining battery level of the battery A is small and the battery B is inserted, voltage supply by the battery B is enabled. In step S6, the port P3 is set to the L level and the port P4 is set to the L level, so that the output voltages of the battery A and the battery B are supplied to the electronic device 10 to simply operate the microcomputer 11 or It is possible to enable a minimum operation such as a warning that the battery level is low. In this state, if the electronic device is a camera, for example, autofocus and release operations are prohibited.

  In addition, according to the first embodiment, when two batteries are inserted, the battery voltage supplied to the electronic device can be performed by one battery according to the state of charge of the batteries. In addition, even when a normally used battery is removed, the power supply device can switch the battery without depending on the microcomputer. With this configuration, it is possible to prevent a voltage drop when the battery is instantaneously removed.

In addition, according to the first embodiment, when it is detected that two batteries have fallen below a predetermined voltage, voltage can be supplied simultaneously from the two batteries. As a result, when the electronic device is a camera, control is performed to prohibit release, and a warning that there is no remaining battery power is displayed on the LED, etc., and release prohibition control and warning are fully displayed even when there is no remaining battery power. It becomes possible to do.
In addition, according to the first embodiment, when only one battery is used, when another battery is inserted, until one of the two batteries has no remaining battery power, You can continue to use and use up one battery. Thereafter, by switching to the other battery, it is possible to clarify the battery being used.

Needless to say, one of the two batteries in use may be displayed on a display unit such as an LED.
(Second Embodiment)
FIG. 6 is a circuit diagram showing a second embodiment of the present invention.
In the second embodiment shown in FIG. 6, the same parts as those in the first embodiment shown in FIG. The second embodiment is different from the first embodiment in the following points.

The batteries A and B are batteries with a remaining battery level detection function (fuel gauge: FG), and fuel gauge communication (hereinafter referred to as FG communication) performed between the power supply device 20 side and the electronic device 10. That is, the switching circuit 18 for switching is provided, and the voltage detection circuit 13 is not provided.
Here, the switching circuit 18 corresponds to a circuit composed of a general-purpose logic IC or discrete components.

  Regarding the determination of the battery voltage, in the first embodiment, the battery voltage is input to the port P5 via the voltage detection circuit 13 and the detected voltage is displayed on the display unit 14 step by step. However, in the second embodiment, the batteries A and B with the FG function are used, and the remaining battery amount information calculated inside the batteries A and B by FG communication using the port P7 of the microcomputer 11 Is obtained and the remaining battery level is displayed on the display unit 14 step by step. At this time, switching between the FG communications of the battery A and the battery B is made possible by controlling the switching circuit 18 with a control signal from the port P6 of the microcomputer 11.

FIG. 7 is a flowchart showing a first operation example of the microcomputer 11 in the second embodiment shown in FIG.
In step S41, the microcomputer 1 detects the L level from the ports P1 and P2, and recognizes that the battery A and the battery B are inserted.
In step S42, the port P6 is set to L, and FG communication with the battery A is performed at the port P7.

In step S43, the presence / absence of the remaining battery level of the battery A is determined based on the result of the FG communication in step S42.
In step S43, if the battery A has a remaining battery level, the process proceeds to step S44. If the battery A has no remaining battery level, the process proceeds to step S45.
In step S44, the port P3 is set to L level and the port P4 is set to H level. As a result, the voltage supply state from the battery A is maintained and the voltage from the battery B is cut off.

In step S45, the port P6 is set to H level, and FG communication with the battery B is performed at the port P7.
In step S46, the presence / absence of the remaining battery level of the battery B is determined based on the result of the FG communication in step S45.
If it is determined in step S46 that the remaining battery level of the battery B is present, the process proceeds to step S47. If it is determined that the remaining battery level of the battery B is not present, the process proceeds to step S48.

In step S47, port P3 is set to H level and port P4 is set to L level. Thereby, the voltage of the battery A is cut off and the voltage is supplied from the battery B. That is, the voltage supply by the battery A is switched to the voltage supply by the battery B, and the process returns to step S45.
In step S48, the port P3 is set to L level and the port P4 is set to L level. Thereby, the voltage of the battery A and the voltage of the battery B can be supplied simultaneously.

In this case, the voltages of the battery A and the battery B are supplied to the electronic device 10, and the microcomputer 11 is simply operated, or the display unit 14 can perform a minimum operation such as a warning that the remaining battery level is low. In this state, if the electronic device is a camera, for example, autofocus and release operations are prohibited.
FIG. 8 is a flowchart showing a second operation example of the microcomputer 11 in the second embodiment shown in FIG.

In FIG. 8, steps S41 to S44 are the same as those in the first operation example shown in FIG. However, if it is determined in step S43 that there is no remaining battery power, the process proceeds to step S60.
In step S51, it is determined whether or not the battery has been removed. If it is determined that the battery has not been removed, the process returns to step S42. If it is determined that the battery has been removed, the process proceeds to step S52.

In step S52, the battery that has been removed is determined to be battery A or battery B. If the removed battery is battery B, the process proceeds to step S53, and if the removed battery is battery A, the process proceeds to step S56.
In step S53 (when battery B is removed), L level is detected from port P1, and H level is detected from port P2.

In step S54, the port P6 is set to L level, and FG communication with the battery A is performed at the port P7.
In step S55, the presence / absence of the remaining battery level of the battery A is determined based on the result of the FG communication in step S54. If the remaining battery level of the battery A is present, the process returns to step S54, and the voltage supply state by the battery A is maintained. If there is no remaining battery charge of battery A, the process proceeds to step S67.

In step S56 (when battery A is removed), H level is detected from port P1, and L level is detected from port P2.
In step S57, port P3 is set to H level and port P4 is set to L level.
In step S58, the port P6 is set to H level, and FG communication with the battery B is performed at the port P7.

In step S59, the presence or absence of the remaining battery level of the battery B is determined based on the result of the FG communication in step S58. If the remaining battery level is present, the process returns to step S58, and the voltage supply state by the battery B is maintained. If there is no remaining battery power, the process proceeds to step S67.
In step S67, the port P3 is set to L level and the port P4 is set to L level. Thereby, the voltage of the battery A and the voltage of the battery B can be supplied simultaneously. In this case, the voltages of the battery A and the battery B are supplied to the electronic device 10, and the microcomputer 11 is simply operated, or the display unit 14 can perform a minimum operation such as a warning that the remaining battery level is low. In this state, if the electronic device is a camera, for example, autofocus and release operations are prohibited.

As described above, when it is determined in step S43 that the remaining battery level of the battery A is not present, the process proceeds to step S60. In step S60, the port P6 is set to H level, and FG communication with the battery B is performed at the port P7.
In step S61, the presence or absence of the remaining battery level of the battery B is determined based on the result of the FG communication in step S60. If there is no remaining battery power, the process proceeds to step S67. If the remaining battery level is present, the process proceeds to step S62.

In step S62, the port P3 is set to H level and the port P4 is set to L level.
In step S63, it is determined whether or not the battery has been removed. If it is determined that the battery has not been removed, the process returns to step S60. If it is determined that the battery has been removed, the process proceeds to step S64.

In step S64, the battery that has been removed is determined to be battery A or battery B. If the removed battery is battery A, the process proceeds to step S65, and if the removed battery is battery B, the process proceeds to step S66.
In step S65 (when the battery A is removed), the H level is detected from the port P1, and the L level is detected from the port P2, and the process returns to step S60 (the voltage supply state by the battery B is maintained).

In step S66 (when the battery B is removed), the L level is detected from the port P1, and the H level is detected from the port P2, and the process proceeds to step S67.
In step S67, the port P3 is set to L level and the port P4 is set to L level. Thereby, the voltage of the battery A and the voltage of the battery B can be supplied simultaneously. In this case, the voltages of the battery A and the battery B are supplied to the electronic device 10, and the microcomputer 11 is simply operated, or the display unit 14 can perform a minimum operation such as a warning that the remaining battery level is low. In this state, if the electronic device is a camera, for example, autofocus and release operations are prohibited.

FIG. 9 is a flowchart showing a third operation example of the microcomputer 11 in the second embodiment shown in FIG.
In step S71, the microcomputer 1 detects the L level from the port P1 and the H level from the port P2, and recognizes that only the battery A is inserted.
In step S72, the port P6 is set to L, and FG communication with the battery A is performed at the port P7.

In step S73, the presence / absence of the remaining battery level of the battery A is determined based on the result of the FG communication in step S72.
In step S73, if the remaining battery level of battery A is present, the process proceeds to step S74. If the remaining battery level of battery A is not present, the process proceeds to step S86. Here, it is assumed that the remaining battery level is present and the process proceeds to step S74.

In step S74, the port P3 is set to L level and the port P4 is set to H level. As a result, the voltage supply state from the battery A is maintained and the voltage from the battery B is cut off.
In step S75, it is determined whether or not the battery B has been inserted. If the battery B is not inserted, the process returns to step S72. If the battery B has been inserted, the process proceeds to step S76.

In step S76, the L level is detected from the port P1 and the L level is detected from the port P2, and it is confirmed that the batteries A and B are mounted.
In step S77, the port P6 is set to H, and FG communication with the battery B is performed at the port P7.
In step S78, the presence or absence of the remaining battery level of the battery B is determined based on the result of the FG communication in step S77. If the remaining battery level of the battery B is present, the process proceeds to step S79. If the remaining battery level of the battery B is not present, the process proceeds to step S83. Here, it is assumed that there is a remaining battery level, and the process proceeds to step S79.

In step S79, the remaining battery level of the battery A and the remaining battery level of the battery B are compared. When the remaining battery level of the battery A is larger, the process proceeds to step S80, and when the remaining battery level of the battery B is larger, the process proceeds to step S90. Here, it is assumed that the remaining amount of the battery A is larger, and the process proceeds to step S80.
In step S80, the port P6 is set to L, and FG communication with the battery A is performed at the port P7.

In step S81, the presence / absence of the remaining battery level of the battery A is determined based on the result of the FG communication in step S80. When the remaining battery level of the battery A is present, the process proceeds to step S82, and when there is no remaining battery level of the battery A, the process proceeds to step S90. Here, it is assumed that the remaining amount of the battery A is present, and the process proceeds to step S82.
In step S82, the port P3 is set to L level and the port P4 is set to H level. Then, it returns to step S80 and the voltage supply state by the battery A is maintained.

As described above, when the remaining battery level of the battery B is larger in step S79, the process proceeds to step S90. In step S81, if the battery A has no remaining battery power, the process proceeds to step S90.
In step S90, the port P6 is set to H, and FG communication with the battery B is performed at the port P7.

  In step S91, the presence / absence of the remaining battery level of the battery B is determined based on the result of the FG communication in step S90. If the remaining battery level of the battery B is present, the process proceeds to step S92. If the remaining battery level of the battery B is not present, the process proceeds to step S93. Since the process of step S93-95 is the same as the process of step S80-82, description is abbreviate | omitted. However, if there is no remaining battery charge of battery A in step S94, the process proceeds to step S96.

In step S92, the port P3 is set to H level and the port P4 is set to L level. Then, it returns to step S90 and the voltage supply state by the battery B is maintained.
As described above, in step S78, if the remaining battery level of the battery B is not present, the process proceeds to step S83. In step S83, the port P6 is set to L, and FG communication with the battery A is performed at the port P7.

  In step S84, the presence / absence of the remaining battery level of the battery A is determined based on the result of the FG communication in step S83. When the remaining battery level of the battery A is present, the process proceeds to step S85, and when there is no remaining battery level of the battery A, the process proceeds to step S96. In step S85, the port P3 is set to L level and the port P4 is set to H level. Then, it returns to step S83 and the voltage supply state by the battery A is maintained.

Further, as described above, in step S73, when the remaining battery level of the battery A is not present, the process proceeds to step S86. In step S86, the port P3 is set to L level and the port P4 is set to L level. Thereby, the voltage supply using both the batteries A and B becomes possible.
In step S87, it is determined whether or not the battery B has been inserted. If no battery B is inserted, the process returns to step S86. If the battery B has been inserted, the process proceeds to step S88.

In step S88, the L level is detected from each of the ports P1 and P2, and the process proceeds to step S90.
Since the operations of steps S90 to S92 and steps S93 to S95 have already been described, they are omitted here.
In step S96, the port P3 is set to the L level and the port P4 is set to the L level, so that the output voltages of the battery A and the battery B are supplied to the electronic device 10 and the microcomputer 11 is simply operated or the battery remaining on the display unit 14 is displayed. It is possible to enable a minimum operation such as a warning that the amount is small. In this state, if the electronic device is a camera, for example, autofocus and release operations are prohibited.

In the second embodiment described above, the batteries A and B are used with priority given to the battery with the higher remaining amount, but the present invention is not limited to this, The lesser one may be used with priority. In particular, in the case of a secondary battery, it is particularly useful that the battery is completely discharged because the battery life is extended.
Further, according to the second embodiment, since the battery remaining amount information can be obtained by the FG communication of the microcomputer, the user can use from a battery with a low battery remaining amount, or can use from a battery with a large battery remaining amount. Since it can be selected, it becomes possible to clarify the usage corresponding to the remaining battery level and the charging timing.

In the first embodiment, the voltage value of the port (P5) is compared with a predetermined reference voltage via the voltage detection circuit in order to detect the battery voltage. On the other hand, in 2nd Embodiment, in order to raise the precision of a battery remaining charge, it comprised so that the battery remaining charge information calculated inside the battery could be obtained using FG communication of a microcomputer. Therefore, it becomes possible to use up the battery remaining amount effectively.
In the first and second embodiments described above, an example in which two batteries are mounted has been described. Needless to say, the present invention can also be applied to a case in which three or more batteries are mounted. It is.

  The present invention can be widely used industrially as a power supply device for electronic devices such as cameras.

1 is a circuit diagram showing a first embodiment of the present invention. It is a flowchart which shows the 1st operation example in 1st Embodiment. It is a flowchart which shows the 2nd operation example in 1st Embodiment. It is a flowchart which shows the 3rd operation example in 1st Embodiment. It is a flowchart which shows the 4th operation example in 1st Embodiment. It is a circuit diagram which shows the 2nd Embodiment of this invention. It is a flowchart which shows the 1st operation example in 2nd Embodiment. It is a flowchart which shows the 2nd operation example in 2nd Embodiment. It is a flowchart which shows the 3rd operation example in 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electronic device, 20 ... Power supply part, 11 ... Microcomputer (microcomputer), 12 ... DC / DC circuit, 13 ... Voltage detection circuit, 14 ... Display part, 18 ... Switching circuit, 21 ... Reference voltage, A, B ... removable battery, SW1, SW2 ... battery detection switch, U1, U2 ... comparator, U3, U4 ... AND circuit, U5, U6 ... NAND circuit, Q1, Q3 ... P channel MOS transistor (PchMOS), Q2, Q4 ... N channel MOS transistor (NchMOS), D1, D2... Diode, R1 to R10.

Claims (10)

A battery unit that can attach and detach a plurality of batteries that supply electric power to the electronic device, a control unit that controls output of the plurality of batteries, and detects whether or not a battery is inserted into the battery unit, and the plurality of batteries In a power supply device for an electronic device having a voltage detection unit that detects a battery voltage of a battery and a display unit that displays a state of the battery voltage detected by the voltage detection unit,
The control unit is configured to be capable of simultaneously recognizing a plurality of batteries immediately after battery insertion, and supplies battery voltage from one battery when recognizing that a plurality of batteries are inserted. Feeding device. In the electronic device power supply device according to claim 1,
When the voltage detection unit detects that the battery voltage of the one battery is lower than a predetermined voltage, the control unit switches the battery voltage supply source to another battery. Feeding device. In the electronic device power supply device according to claim 1,
When the control unit detects that the one battery is removed from the battery unit, the control unit switches a battery voltage supply source to another battery. In the electronic device power supply device according to claim 1,
When the voltage detection unit detects that all of the plurality of battery voltages are below a predetermined voltage, the control unit can supply a voltage from the plurality of batteries, and a predetermined operation is performed. And a power supply device for an electronic device, wherein the display unit displays a warning that there is no remaining battery power. A battery unit that can attach and detach a plurality of batteries that supply electric power to the electronic device, a control unit that controls output of the plurality of batteries, and detects whether or not a battery is inserted into the battery unit, and the plurality of batteries In a power supply device for an electronic device having a voltage detection unit that detects a battery voltage of a battery and a display unit that displays a state of the battery voltage detected by the voltage detection unit,
In the state where one battery is inserted into the battery unit and the one battery voltage is supplied to the electronic device, the control unit is configured to be one of the batteries when the other battery is inserted. And supplying a battery voltage to the electronic device. A battery unit that can attach and detach a plurality of batteries that supply electric power to the electronic device, a control unit that controls output of the plurality of batteries, and detects whether or not a battery is inserted into the battery unit, and the plurality of batteries Power supply of an electronic device having a battery remaining amount detection unit that detects remaining battery levels of a plurality of batteries mounted on the battery unit, and a display unit that displays a state of a battery voltage detected by the battery remaining amount detection unit In the device
The control unit is configured to be capable of simultaneously recognizing a plurality of batteries immediately after battery insertion, and supplies battery voltage from one battery when recognizing that a plurality of batteries are inserted. Feeding device. In the electronic device power supply device according to claim 6,
A power supply device for an electronic device, wherein when the remaining battery level detection circuit detects that the remaining battery level of the one battery is exhausted, the battery voltage supply source is switched to another battery. In the electronic device power supply device according to claim 6,
When the control unit detects that the one battery is removed from the battery unit, the control unit switches a battery voltage supply source to another battery. In the electronic device power supply device according to claim 6,
When the remaining battery level detection unit detects that the remaining battery level is exhausted for all of the plurality of battery voltages, the control unit can supply a voltage from the plurality of batteries, and is further predetermined. A power supply device for an electronic device, which prohibits operation and displays a warning that the battery is low on the display unit. A battery unit that can attach and detach a plurality of batteries that supply electric power to the electronic device, a control unit that controls output of the plurality of batteries, and detects whether or not a battery is inserted into the battery unit, and the plurality of batteries Power supply of an electronic device having a battery remaining amount detection unit that detects remaining battery levels of a plurality of batteries mounted on the battery unit, and a display unit that displays a state of a battery voltage detected by the battery remaining amount detection unit In the device
The control unit detects the remaining battery level when one battery is inserted into the battery unit and the other battery is inserted when the one battery voltage is supplied to the electronic device. An apparatus for supplying power to an electronic device, comprising: detecting a remaining battery level by the unit; and selecting any one battery according to the detected remaining battery level and supplying a battery voltage to the electronic device.

Images