JP2014110668A - Electronic device, charge control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine whether or not an external power supply device is separated from an electronic device during charge of a battery device without cutting off reverse current.SOLUTION: An electronic device (100) has: first connection means (101) for connecting an external power supply device (200); second connection means (102) for connecting a battery device (300); first voltage detection means (107) for detecting first voltage in the first connection means; second voltage detection means (108) for detecting second voltage in the second connection means; and control means (109) for controlling the battery device to stop charging when the external power supply device is separated from the first connection means. The control means, on the basis of the first voltage and the second voltage, determines whether or not the external power supply device is separated from the first connection means.

Description

  The present invention relates to an electronic device having a function for charging a battery device.

  Patent Document 1 describes an electronic device that can charge a battery device using power supplied from an external power supply device (AC adapter or the like). In such an electronic device, it is desirable to be able to determine whether or not the external power supply device is disconnected from the electronic device during charging of the battery device. The reason is that when the external power supply device is disconnected from the electronic device during the charging of the battery device, it is necessary to stop the charging of the battery device.

JP 2008-228416 A

  In the configuration shown in FIG. 4 of Patent Document 1, a reverse current flows from the battery device 16 to the detection circuit 23 when the external power supply device 24 is disconnected from the terminal DCIN during charging of the battery device 16. Therefore, in the configuration shown in FIG. 4 of Patent Document 1, even if the external power supply 24 is disconnected from the terminal DCIN while the battery device 16 is being charged, the detection circuit 23 cannot detect the disconnection of the external power supply 24. There's a problem.

  The configuration shown in FIG. 6 of Patent Document 1 is based on the premise that the reverse current flowing from the battery device 25 to the detection circuit 32 is interrupted. Therefore, in the configuration shown in FIG. 6 of Patent Document 1, if the reverse current is not interrupted by the diode 34, the detection circuit 32 indicates that the external power supply device 33 is disconnected from the terminal DCIN while the battery device 25 is being charged. There is a problem that it cannot be detected. Further, in the configuration shown in FIG. 6 of Patent Document 1, since the diode 34 has to be added, there is a possibility that problems such as a decrease in charging efficiency and an increase in cost may occur.

  The configuration shown in FIG. 1 of Patent Document 1 is based on the premise that the reverse current flowing from the battery device 1 to the detection circuit 8 is interrupted. Therefore, in the configuration shown in FIG. 1 of Patent Document 1, unless the reverse current is cut off by the switch 12 and the control circuit 11, the external power supply device 14 is disconnected from the terminal DCIN while the battery device 1 is being charged. There is a problem that the detection circuit 8 cannot be detected. Further, in the configuration shown in FIG. 1 of Patent Document 1, since the switch 12 and the control circuit 11 must be added, there is a possibility that problems such as a decrease in charging efficiency and an increase in cost may occur.

  In view of the above, an object of the present invention is to make it possible to determine whether or not an external power supply device is disconnected from an electronic device during charging of the battery device without interrupting the reverse current.

  An electronic apparatus according to the present invention detects a first voltage at a first connection means for connecting an external power supply device, a second connection means for connecting a battery device, and the first connection means. When the first voltage detecting means, the second voltage detecting means for detecting the second voltage in the second connecting means, and the external power supply device are disconnected from the first connecting means, Control means for performing control for stopping charging of the battery device, wherein the control means is configured to connect the external power supply device to the first connection based on the first voltage and the second voltage. It is characterized by determining whether or not it has been disconnected from the means.

  The charging control method according to the present invention detects a first voltage corresponding to the voltage in the first connection means for connecting the external power supply apparatus, and uses the voltage in the second connection means for connecting the battery device. A corresponding second voltage is detected, and based on the first voltage and the second voltage, it is determined whether the external power supply device is disconnected from the first connection means; When the device is disconnected from the first connection means, control for stopping charging of the battery device is performed.

  One of the programs according to the present invention includes a first connection means for connecting an external power supply device, a second connection means for connecting a battery device, and a first voltage in the first connection means. When the first voltage detecting means for detecting the second voltage detecting means for detecting the second voltage at the second connecting means and the external power supply device are disconnected from the first connecting means. And control means for performing control for stopping charging of the battery device, wherein the control means is configured such that the external power supply device is based on the first voltage and the second voltage. It is a program for functioning a computer as an electronic device characterized by determining whether or not the connection means is disconnected.

  One of the programs according to the present invention detects a first voltage corresponding to a voltage in the first connection means for connecting the external power supply device, and a voltage in the second connection means for connecting the battery device. And detecting whether the external power supply device is disconnected from the first connection means based on the first voltage and the second voltage, and A program for causing a computer to execute a charge control method for performing control for stopping charging of the battery device when a power supply device is disconnected from the first connection means.

  According to the present invention, it is possible to determine whether or not the external power supply device is disconnected from the electronic device during charging of the battery device without interrupting the reverse current.

FIG. 3 is a block diagram for explaining components included in the electronic device according to the first embodiment. 3 is a flowchart for explaining a charging control process performed by the electronic device according to the first embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, embodiments of the present invention are not limited to the following embodiments.

[Embodiment 1]
FIG. 1 is a block diagram for explaining components included in the electronic device 100 according to the first embodiment.

  In FIG. 1, an electronic device 100 is a device having a function for charging a battery device 300. The battery device 300 includes at least one rechargeable secondary battery.

  As illustrated in FIG. 1, the electronic device 100 includes a first terminal 101, a second terminal 102, a resistor 103, a FET (Field Effect Transistor) switch 104, and a FET (Field Effect Transistor) switch 105. The electronic device 100 further includes a current detection unit 106, a first voltage detection unit 107, a second voltage detection unit 108, a CPU (Central Processing Unit) 109, a memory 110, a memory 111, and a notification unit 112.

  In FIG. 1, the first terminal 101 is configured as a first connection unit for connecting the electronic device 100 and the external power supply device 200. The external power supply apparatus 200 is a power supply apparatus such as an AC adapter and operates as an external power supply for the electronic device 100. The external power supply apparatus 200 has a function for converting AC power into DC power, for example.

  The second terminal 102 is configured as a second connection unit for connecting the electronic device 100 and the battery device 300.

  The resistor 103 is a resistor for detecting the charging current Ic flowing from the first terminal 101 to the second terminal 102.

  The FET switch 104 is a switch for setting a conductive state or a non-conductive state between the first terminal 101 and the second terminal 102. The FET switch 104 is turned on by the CPU 109 when the CPU 109 determines to start charging the battery device 300. When the FET switch 104 is on, the first terminal 101 and the second terminal 102 are in a conductive state. When the first terminal 101 and the second terminal 102 are in a conductive state, the charging current Ic flows from the first terminal 101 to the second terminal 102. The FET switch 104 is turned off by the CPU 109 when the CPU 109 determines to stop charging the battery device 300. When the FET switch 104 is off, the first terminal 101 and the second terminal 102 are non-conductive. When the first terminal 101 and the second terminal 102 are non-conductive, the charging current Ic flowing from the first terminal 101 to the second terminal 102 is interrupted by the FET switch 104.

  The FET switch 105 is a switch for controlling the charging current Ic or the charging voltage Vc so that the charging current Ic or the charging voltage Vc becomes a predetermined current level or a predetermined voltage level. The charging current Ic corresponds to the current flowing from the first terminal 101 to the second terminal 102, and the charging voltage Vc corresponds to the voltage supplied from the first terminal 101 to the second terminal 102.

  The current detection unit 106 is configured to detect the charging current Ic flowing from the first terminal 101 to the second terminal 102. The current detection unit 106 may be configured using a current detection circuit that a charging device normally has in order to detect a charging current. When the current detection unit 106 is configured in this way, the cost of the electronic device 101 can be further reduced.

  The first voltage detection unit 107 is configured to detect a voltage Ve that is a first voltage. The voltage Ve corresponds to the voltage at the first terminal 101. The voltage at the first terminal 101 corresponds to the charging voltage Vc. Therefore, the first voltage detection unit 107 may be configured using a voltage detection circuit that a charging device normally has in order to detect a charging voltage. When the first voltage detection unit 107 is configured in this way, the cost of the electronic device 101 can be further reduced.

  The second voltage detector 108 is configured to detect the voltage Vb that is the second voltage. The voltage Vb corresponds to the voltage at the second terminal 102. The voltage at the second terminal 102 corresponds to the power supply voltage. Therefore, the second voltage detection unit 108 may be configured using a voltage detection circuit that a charging device normally has in order to detect a power supply voltage. When the second voltage detection unit 108 is configured in this way, the cost of the electronic device 101 can be further reduced.

  The CPU 109 includes a microcomputer and operates as a control unit for controlling charging of the battery device 300. The CPU 109 determines the FET based on the voltage Ve detected by the first voltage detector 107, the voltage Vb detected by the second voltage detector 108, and the charging current Ic detected by the current detector 106. The switch 104 and the FET switch 105 are configured to be controlled. Further, the CPU 109 controls the first terminal 101, the second terminal 102, the current detection unit 106, the first voltage detection unit 107, the second voltage detection unit 108, the memory 110, the memory 111, and the notification unit 112. Operates as a control unit. Further, the CPU 109 operates as a control unit for controlling the external power supply device 200 and the battery device 300.

  The CPU 109 can communicate with the CPU in the external power supply apparatus 200 and is configured to receive information I1 that is information related to the external power supply apparatus 200 from the external power supply apparatus 200. For example, the information I1 includes at least one of information related to performance, operation state, error state, and the like. Further, the CPU 109 can communicate with the CPU in the battery device 300 and is configured to receive information I2 that is information related to the battery device 300 from the battery device 300. For example, the information I2 includes at least one of information related to the remaining capacity, the full charge capacity, the temperature, the life, the performance, the operation state, the error state, and the like.

  The memory 110 stores a program executed by the CPU 109 and the like. A program for controlling charge control processing P <b> 1 to be described later is stored in the memory 110. The memory 110 is a non-transitory storage medium.

  The memory 111 stores information used by the CPU 109. The voltage Ve detected by the first voltage detector 107, the voltage Vb detected by the second voltage detector 108, and the charging current Ic detected by the current detector 106 are stored in the memory 111. . The memory 111 is composed of, for example, a RAM (Random Access Memory).

  The notification unit 112 is configured to notify the user of the charge state of the battery device 300. For example, the notification unit 112 can notify the user of the state of charge of the battery device 300 using at least one of light, sound, characters, symbols, messages, and images.

  In the first embodiment, the external power supply device 200 is connected to the first terminal 101, and when the electronic device 100 is charging the battery device 300, the voltage Ve is set higher than the voltage Vb. The electronic device 100 and the external power supply device 200 are configured. In the first embodiment, when the external power supply device 200 is disconnected from the first terminal 101 while the battery device 300 is being charged, the electronic device is configured so that a backflow current flows from the battery device 300 to the first voltage detection unit 107. The device 100 is configured. Further, in the first embodiment, the electronic device 100 is configured such that the reverse current flows from the battery device 300 to the first voltage detection unit 107, so that the voltage Ve becomes equal to or lower than the voltage Vb. By configuring the electronic device 100 in this manner, when the external power supply device 200 is disconnected from the first terminal 101 during charging of the battery device 300, the voltage Ve becomes equal to or lower than the voltage Vb. Therefore, in the first embodiment, the electronic apparatus 100 is configured to determine whether or not the external power supply device 200 is disconnected from the first terminal 101 during charging of the battery device 300 based on the voltage Ve and the voltage Vb. . Such a configuration of the electronic device 100 is different from the configuration described in Patent Document 1. Thereby, the electronic device 100 disconnects the external power supply device 200 from the first terminal 101 during charging of the battery device 300 without interrupting the backflow current flowing from the battery device 300 to the first voltage detection unit 107. It can be determined whether or not. In other words, the electronic device 100 uses the situation in which a backflow current flows from the battery device 300 to the first voltage detection unit 107, so that the external power supply device 200 is connected to the first terminal 101 during charging of the battery device 300. It can be determined whether or not it has been disconnected from.

  The electronic device 100 may be a device that operates as at least one of a digital camera, a digital video camera, a scanner, a mobile phone, and a computer.

  FIG. 2 is a flowchart for explaining the charging control process P1 performed in the electronic device 100 according to the first embodiment. For example, when the power switch of the electronic device 100 is turned on, the CPU 109 starts the charging control process P1.

  In step S201, the CPU 109 determines whether or not a predetermined condition C1 is satisfied.

  The predetermined condition C1 is a condition for determining whether or not charging of the battery device 300 is started. For example, when the external power supply device 200 is connected to the first terminal 101, the battery device 300 is connected to the second terminal 102, and the voltage Ve is within a predetermined voltage range, the predetermined condition C1 May be determined to be satisfied. Further, for example, the external power supply device 200 is connected to the first terminal 101, the battery device 300 is connected to the second terminal 102, the voltage Ve is within a predetermined voltage range, and the temperature is a predetermined temperature. When it is within the range, it may be determined that the predetermined condition C1 is satisfied. In this case, the electronic device 100 further includes a temperature detection unit for detecting the temperature of the electronic device 100 or the temperature around the electronic device 100.

  When the predetermined condition C1 is satisfied (YES in step S201), the CPU 109 determines to start charging the battery device 300, and proceeds from step S201 to step S202.

  When the predetermined condition C1 is not satisfied (NO in step S201), the CPU 109 determines that charging of the battery device 300 is not started, and returns to step S201 again.

  In step S202, the CPU 109 controls the FET switch 105 so that the charging current Ic or the charging voltage Vc becomes a predetermined current level or a predetermined voltage level. In step S202, the CPU 109 turns on the FET switch 104 so that the charging current Ic is supplied to the battery device 300. When the FET switch 104 is turned on, the first terminal 101 and the second terminal 102 become conductive.

  In step S202, the CPU 109 instructs the notification unit 112 to notify the user of the state of charge of the battery device 300. In step S202, the notification unit 112 notifies the user that charging of the battery device 300 has started in accordance with an instruction from the CPU 109. For example, the notification unit 112 notifies the user that the charging of the battery device 300 has started by turning on the display.

  In step S <b> 203, the CPU 109 instructs the first voltage detection unit 107 to detect the voltage Ve, and acquires the voltage Ve detected by the first voltage detection unit 107 from the first voltage detection unit 107. The voltage Ve corresponds to the voltage at the first terminal 101.

  In step S <b> 204, the CPU 109 instructs the second voltage detection unit 121 to detect the voltage Vb, and acquires the voltage Vb detected by the second voltage detection unit 108 from the second voltage detection unit 108. The voltage Vb corresponds to the voltage at the second terminal 102.

  In step S205, the CPU 109 stores the voltage Ve acquired in step S203 and the voltage Vb acquired in step S204 in the memory 111.

  In step S206, the CPU 109 reads the voltage Ve and the voltage Vb from the memory 111, and compares the voltage Ve and the voltage Vb. Then, the CPU 109 determines whether or not the external power supply device 200 is disconnected from the first terminal 101 by comparing the voltage Ve and the voltage Vb. The CPU 109 further determines whether or not to stop the charging of the battery device 300 by comparing the voltage Ve and the voltage Vb.

  When voltage Ve is higher than voltage Vb (YES in step S206), CPU 109 determines that external power supply device 200 is not disconnected from first terminal 101, and proceeds from step S206 to step S208. When voltage Ve is higher than voltage Vb (YES in step S206), CPU 109 further prevents charging of battery device 300.

  If voltage Ve is not higher than voltage Vb (NO in step S206), CPU 109 determines that external power supply device 200 has been disconnected from first terminal 101, and proceeds from step S206 to step S207. When the voltage Ve is not higher than the voltage Vb (NO in step S206), the CPU 109 further performs a process for stopping charging of the battery device 300.

  In step S207, the CPU 109 turns off the FET switches 104 and 105 in order to stop the charging of the battery device 300. When the FET switch 104 is turned off, the first terminal 101 and the second terminal 102 become non-conductive. When the first terminal 101 and the second terminal 102 become non-conductive, charging of the battery device 300 is stopped. In step S207, the CPU 109 may turn off the FET switch 104 first, and turn off the FET switch 105 after a predetermined time has elapsed since the FET switch 104 was turned off.

  In step S207, the CPU 109 instructs the notification unit 112 to notify the user of the state of charge of the battery device 300. In step S207, the notification unit 112 notifies the user that charging of the battery device 300 has been stopped in accordance with an instruction from the CPU 109. For example, the notification unit 112 notifies the user that charging of the battery device 300 has been stopped by turning off the display.

  In step S208, the CPU 109 determines whether or not a predetermined condition C2 is satisfied.

  The predetermined condition C2 is a condition for determining whether or not to continue charging the battery device 300. For example, when the external power supply device 200 is connected to the first terminal 101, the battery device 300 is connected to the second terminal 102, and the voltage Ve is within a predetermined voltage range, the predetermined condition C2 May be determined to be satisfied. Further, for example, the external power supply device 200 is connected to the first terminal 101, the battery device 300 is connected to the second terminal 102, the voltage Ve is within a predetermined voltage range, and the temperature is a predetermined temperature. When it is within the range, it may be determined that the predetermined condition C2 is satisfied. In this case, the electronic device 100 further includes a temperature detection unit for detecting the temperature of the electronic device 100 or the temperature around the electronic device 100.

  If predetermined condition C2 is satisfied (YES in step S208), CPU 109 determines to continue charging battery device 300, and proceeds from step S208 to step S203.

  When predetermined condition C2 is not satisfied (NO in step S208), CPU 109 determines that charging of battery device 300 is not continued, and proceeds from step S208 to step S207.

  Thus, the electronic device 100 can determine whether or not the external power supply device 200 is disconnected from the first terminal 101 during charging of the battery device 300 without interrupting the backflow current. In other words, the electronic device 100 can determine whether or not the external power supply device 200 is disconnected from the first terminal 101 during the charging of the battery device 300 by using the situation where the backflow current flows. .

[Embodiment 2]
The various functions, processes, and methods described in the first embodiment can be realized by a personal computer, a microcomputer, a CPU (Central Processing Unit), and the like using a program. Hereinafter, in the second embodiment, a personal computer, a microcomputer, a CPU, and the like are referred to as “computer X”. In the second embodiment, a program for controlling the computer X and realizing the various functions, processes, and methods described in the first embodiment is referred to as “program Y”.

  The various functions, processes, and methods described in the first embodiment are realized by the computer X executing the program Y. In this case, the program Y is supplied to the computer X via a computer-readable storage medium. The computer-readable storage medium according to the second embodiment includes at least one of a hard disk device, an optical disk, a CD-ROM, a CD-R, a memory card, a ROM, and a RAM. In addition, the computer-readable storage medium in the second embodiment is a non-transitory storage medium.

100 Electronic device 101 First terminal (first connection portion)
102 2nd terminal (2nd connection part)
103 resistor 104 FET switch (first switch)
105 FET switch (second switch)
106 current detection unit 107 first voltage detection unit 108 second voltage detection unit 109 CPU
110 Memory 111 Memory 112 Notification Unit 200 External Power Supply Device 300 Battery Device

Claims (14)

First connection means for connecting an external power supply;
A second connecting means for connecting the battery device;
First voltage detection means for detecting a first voltage in the first connection means;
Second voltage detection means for detecting a second voltage in the second connection means;
Control means for performing control for stopping charging of the battery device when the external power supply device is disconnected from the first connection means;
The electronic device according to claim 1, wherein the control means determines whether or not the external power supply device is disconnected from the first connection means based on the first voltage and the second voltage.   2. The electron according to claim 1, wherein when the first voltage is lower than the second voltage, the control unit determines that the external power supply device is disconnected from the first connection unit. machine.   When the first voltage is lower than the second voltage, the control means causes the first connection means and the second connection means to be in a non-conductive state. The electronic device according to claim 1 or 2.   The control means determines that the external power supply device is not disconnected from the first connection means when the first voltage is higher than the second voltage. The electronic device according to any one of the above.   5. The device according to claim 1, wherein when the first voltage is higher than the second voltage, the first connection means and the second connection means are in a conductive state. Item 1. An electronic device according to item 1.   In the case where the external power supply device is disconnected from the first connection means, and when the charging of the battery device is stopped, there is provided a notification means for notifying that the charging of the battery device is stopped. The electronic device according to any one of claims 1 to 5, wherein:   The program for functioning a computer as an electronic device of any one of Claim 1 to 6. Detecting a first voltage corresponding to the voltage at the first connecting means for connecting the external power supply;
Detecting a second voltage corresponding to the voltage at the second connecting means for connecting the battery device;
Based on the first voltage and the second voltage, it is determined whether or not the external power supply device is disconnected from the first connection means,
A charge control method comprising: performing control for stopping charging of the battery device when the external power supply device is disconnected from the first connection means.   The charge control method according to claim 8, wherein when the first voltage is lower than the second voltage, it is determined that the external power supply device is disconnected from the first connection unit.   9. The non-conducting state between the first connecting means and the second connecting means when the first voltage is lower than the second voltage. Or the charge control method of 9.   11. The method according to claim 8, wherein when the first voltage is higher than the second voltage, it is determined that the external power supply device is not disconnected from the first connection means. The charge control method according to item.   12. The device according to claim 8, wherein when the first voltage is higher than the second voltage, the first connection unit and the second connection unit are in a conductive state. 2. The charge control method according to item 1.   When the external power supply device is disconnected from the first connection means, and charging of the battery device is stopped, notification that the charging of the battery device is stopped is provided. The charge control method according to any one of claims 8 to 12.   The program for making a computer perform the charge control method of any one of Claims 8-13.

Images