JP2014036531A - Battery power supply device and electronic apparatus - Google Patents

Abstract

A battery power supply device capable of easily reducing power consumption is realized.
A battery power supply device according to the present invention is provided in a portable terminal 1 that can be connected to a battery 2 and a charger 3 via terminals T1 and T2, respectively, and includes a charging circuit 6, a power supply circuit 7, and a power switch. 8, first and second switch units 11 and 12, a switch control unit 5 a, a power supply circuit control unit 5 b, and a reset IC 13.
[Selection] Figure 1

Description

  The present invention relates to a battery power supply device provided in a mobile terminal.

  In recent years, lithium ion secondary batteries having advantages such as high voltage, high energy density, and light weight have been widely used as power sources for mobile terminals such as mobile phones and notebook computers.

  When the battery voltage reaches a deep discharge region (for example, about 1.0 V or less), the lithium ion secondary battery may cause an internal short circuit due to deposition of metallic lithium. If the secondary battery is charged in such a state, the secondary battery may ignite or rupture. Therefore, in recent years, a protection IC (Integrated Circuit) having a function of prohibiting charging in a deep discharge state is often mounted on a battery pack in order to improve safety.

  However, if this charge prohibition function operates, no charge / discharge is possible thereafter. Therefore, at present, in order to extend the period until the battery voltage reaches the deep discharge region, when the battery voltage falls below the overdischarge detection voltage, the protection IC is set in the sleep state to reduce the current consumption in the protection circuit. Measures are taken such that the overdischarge detection voltage is set high.

  In this method, since the current consumption after reaching the overdischarge area is reduced, the period from reaching the overdischarge area to the deep discharge area can be extended, and the storage period of the battery pack can be extended. Can be made. However, since the capacity of the battery pack remaining between reaching the overdischarge region and reaching the deep discharge region is extremely limited, there is a limit to extending the storage period.

  Therefore, it is possible to set a shutdown voltage to shut down the electronic device connected to the battery pack, shut down the electronic device when the battery voltage reaches the shutdown voltage, and reduce the current consumption up to the overdischarge detection voltage. Proposed.

  In this method, when the battery voltage becomes equal to or lower than the shutdown voltage, the current consumption can be reduced by shutting down the electronic device connected to the battery pack. However, there is a problem that it is difficult to further extend the storage period since the dark current flows to the electronic device from the time when the voltage falls below the shutdown voltage until the overdischarge detection voltage is reached. It was.

  In order to solve this problem, the following Patent Document 1 detects a storage state (storage mode) based on the presence or absence of discharge, and shuts off the battery pack from the application main body according to the detection result, thereby causing unnecessary discharge. Techniques for preventing this are described.

  In the invention described in Patent Document 1, the time during which no discharge current flows is counted using a timer, and when a predetermined period has elapsed based on the count value, it is determined that the storage mode has been entered, and the protection circuit is shut off. I am doing so. Therefore, current consumption while the battery pack is in the storage mode can be reduced, and the storage period can be further extended.

  However, in the invention described in Patent Document 1, when the storage state is detected based only on the count value of the timer, the storage mode is used when a predetermined period of time has elapsed without regard to the state of charge of the battery pack. It is judged that there is. Therefore, for example, even when the battery pack is in a fully charged state, there is a problem that the battery pack becomes unusable by shutting off the protection circuit when it is determined that the battery pack is in the storage mode.

  In order to solve this problem, Patent Document 2 below measures the battery voltage and the period when the discharge current is zero, and when the battery voltage is below a specified value and there is no discharge for a certain period of time. A technique for determining that the storage mode has been entered and separating the battery and the power supply circuit is disclosed.

  FIG. 5 is a block diagram showing a configuration of the battery pack 101 disclosed in Patent Document 2. As shown in FIG. The battery pack 101 includes an assembled battery 102, a charge control FET (Field Effect Transistor) 103, a discharge control FET 104, a current detection resistor 105, a switch 106, and a control unit 107. The battery pack 101 also includes a positive electrode terminal 108 and a negative electrode terminal 109. During charging, the positive electrode terminal 108 and the negative electrode terminal 109 are connected to the positive electrode terminal and the negative electrode terminal of the charger, respectively, and charging is performed. When the electronic device is used, the positive electrode terminal 108 and the negative electrode terminal 109 are connected to the positive electrode terminal and the negative electrode terminal of the electronic device, respectively, and discharge is performed.

  The control unit 107 measures the battery voltage of the secondary battery 102a every predetermined time, and detects overcharge or overdischarge based on the measurement result. For example, the control unit 107 controls to turn off the charge control FET 103 when overcharge is detected, and controls to turn off the discharge control FET 104 when overdischarge is detected. In addition, the control unit 107 uses the current detection resistor 105 provided in the current path to measure a charge / discharge current from a potential difference generated at both ends of the control unit 107 every predetermined time, and detects an overcurrent based on the measurement result.

  After the charge control FET 103 is turned off, only discharge is possible through a parasitic diode (not shown) provided in parallel with the charge control FET 103. Further, after the discharge control FET 104 is turned off, only charging is possible through a parasitic diode (not shown) provided in parallel to the discharge control FET 104.

  The control unit 107 is provided with a timer 110. The timer 110 starts counting when the discharge current flowing through the current detection resistor 105 becomes a predetermined current value or less, and the time during which the discharge current is less than the predetermined current value, that is, the discharge current continuously flows. Measure not the time. The control unit 107 determines that the battery pack 101 has entered the storage mode when the count value of the timer 110 is equal to or greater than a predetermined value (for example, 10 days) and the battery voltage of the secondary battery 102a is equal to or lower than the predetermined voltage. It judges and controls so that switch 106 may be turned off. Thereby, the dark current with respect to the electronic device connected to the battery pack 101 is interrupted.

JP 2003-244858 A (released on August 29, 2003) JP 2011-1115012 A (released on June 9, 2011)

  However, in the invention described in Patent Document 2, since the voltage detection and the counter operation are continued in the control unit 107 even after the power of the battery pack 101 is turned off (after transition to the storage mode), the battery pack 101 continues to consume power. There is a problem. Further, when the battery pack 101 shifts to the storage mode, there is a problem that the battery pack 101 cannot be returned to the normal state unless a charger is connected.

  The present invention has been made to solve the above-described problems, and an object thereof is to realize a battery power supply device that can easily reduce power consumption.

  In order to solve the above problems, a battery power supply device according to the present invention is a battery power supply device provided in an electronic device that can be connected to a battery and a charger through first and second terminals, respectively. A charge control unit that is connected to the terminal 2 and controls power supply from the charger to the electronic device, and a power supply unit that turns on / off power supply from the charge control unit to the load of the electronic device, A power switch that is turned on / off by a power button of the electronic device, a first and second switch unit, a switch control unit that controls the second switch unit, and a first and a second unit that control activation of the power supply unit; A second power supply control unit, wherein the power supply unit is provided between the charge control unit and the load, and one end of the power switch is connected to a first terminal, and the first switch Part is the first A first connection point between the terminal and the power switch and the charge control unit; one end of the second switch unit is a first point between the charge control unit and the power supply unit; The other end of the second switch unit, the other end of the power switch, and the third connection point between the power supply unit and the load are connected at the fourth connection point. The first switch unit is connected to each other and connected to the first switch unit. The first switch unit is turned on between the first connection point and the charge control unit depending on whether power is supplied from the fourth connection point. The second switch unit is configured to switch between the second connection point and the fourth connection point depending on the ON / OFF control by the switch control unit and the presence / absence of power supply from the second connection point. Is configured to switch ON / OFF between and The switch control unit controls the second switch unit to be turned off when the power switch is turned off, and the first power supply control unit is turned on when the power switch is turned off. The power supply unit is stopped, and the second power supply control unit is connected to the other end of the power switch and activates the power supply unit when power is supplied from the power switch. .

  According to the above configuration, when the power button is pressed while the electronic device is activated, the power switch is turned off. The switch control unit controls the second switch unit to be OFF, and the first power supply control unit stops the power supply unit. At this time, since the charge control unit and the power supply unit are stopped, the power supply from the battery to the fourth connection point is stopped. Therefore, the power supply from the fourth connection point to the first switch unit is stopped, and the first switch unit is turned off. At this time, since the power switch and the first switch unit are in the OFF state, the power supply from the battery to the electronic device is completely stopped. Therefore, the battery shifts to a storage mode where power is not consumed.

  Further, when the electronic device in the storage mode is activated without being connected to the charger, when the power button is pressed and the power switch is turned on, power is supplied to the first switch unit. As a result, the first switch unit is turned on, and power from the battery is supplied to the charge control unit, so that the charge control unit is activated. Thereby, the electric power from a battery is supplied to a 2nd switch part, and a 2nd switch part is set to ON. The second power supply control unit activates the power supply unit when power is supplied from the power switch. Therefore, electric power is supplied from the battery to the load.

  As described above, when the electronic device is activated, the storage mode is automatically entered simply by pressing the power button. Therefore, unlike the conventional configuration, there is no need to provide a counter or the like for determining the storage mode in the battery, and the power consumption in the battery can be further reduced. Further, since the normal state can be restored from the storage mode simply by pressing the power button, it is not necessary to connect a charger to the electronic device as in the conventional configuration.

  Therefore, a battery power supply device that can easily reduce power consumption can be realized.

  In the battery power supply device according to the present invention, the first diode provided between the other end of the second switch unit and the fourth connection point, the other end of the power switch and the fourth connection point, And a third diode provided between the third connection point and the fourth connection point, and the anode of the first diode is the second diode. The anode of the second diode is connected to the other end of the power switch, the anode of the third diode is connected to the third connection point, and the first to third are connected. Each cathode of the diode is preferably connected to the fourth connection point.

  According to the above configuration, when the power button is pressed and the power switch is turned off while the electronic device is activated, power supply from the battery to the anode of the second diode is stopped. The switch control unit controls the second switch unit to be OFF, and the first power supply control unit stops the power supply unit. At this time, since the charge control unit and the power supply unit are stopped, the power supply from the battery to each anode of the first and third diodes is stopped. Therefore, the power supply from the fourth connection point to the first switch unit is stopped, and the first switch unit is turned off. At this time, since the power switch and the first switch unit are in the OFF state, the power supply from the battery to the electronic device is completely stopped. Therefore, the battery shifts to a storage mode where power is not consumed.

  When the electronic device in the storage mode is started without being connected to the charger, when the power button is pressed and the power switch is turned on, power is supplied to the first switch unit via the second diode. Is done. As a result, the first switch unit is turned on, and power from the battery is supplied to the charge control unit, so that the charge control unit is activated. Thereby, the electric power from a battery is supplied to a 2nd switch part, and a 2nd switch part is set to ON. The second power supply control unit activates the power supply unit when power is supplied from the power switch. Therefore, power is supplied from the battery to the load.

  As described above, when the electronic device is activated, the storage mode is automatically entered simply by pressing the power button. Therefore, unlike the conventional configuration, there is no need to provide a counter or the like for determining the storage mode in the battery, and the power consumption in the battery can be further reduced. Further, since the normal state can be restored from the storage mode simply by pressing the power button, it is not necessary to connect a charger to the electronic device as in the conventional configuration.

  Therefore, a battery power supply device that can easily reduce power consumption can be realized.

  In the battery power supply device according to the present invention, the first switch unit includes a first FET switch and a first FET driver, and each of the two controlled terminals of the first FET switch has a first connection. And the control terminal of the first FET switch is connected to the output terminal of the first FET driver, and the input terminal of the first FET driver is connected to the fourth connection point. Preferably it is.

  According to the above configuration, when power is supplied from the fourth connection point to the input terminal of the first FET driver, the first FET driver is turned on and the first FET switch is also turned on. Therefore, the first switch unit is switched on by the power supply from the fourth connection point.

  In the battery power supply device according to the present invention, the second switch section includes a second FET switch, a second FET driver, and a resistor, and one controlled terminal of the second FET switch is the second FET switch. The connection point, the power supply terminal of the second FET driver, and one end of the resistor are connected. The other controlled terminal of the second FET switch is connected to the anode of the first diode, and the output of the second FET driver. The terminal is connected to the gate of the second FET switch, the input terminal of the second FET driver is connected to the other end of the resistor, and the input terminal of the second FET driver is connected to the input from the switch controller. A control signal is preferably input.

  According to the above configuration, since the output terminal of the second FET driver is connected to the gate of the second FET switch, when the second FET driver is turned on, the second FET switch is also turned on. The Here, when electric power is supplied from the second connection point to the second switch unit, the electric power is supplied to the input terminal of the second FET driver. Therefore, the second FET driver and the second FET switch are turned on.

  Further, when the control signal from the switch control unit is input to the input terminal of the second FET driver, the second FET driver is ON / OFF controlled by the switch control unit. Here, even when power is supplied from the second connection point to the second switch unit, the input terminal of the second FET driver is connected to the second connection point via the resistor R1. Therefore, the switch control unit can perform ON / OFF control of the second switch unit.

  An electronic apparatus according to the present invention includes the battery power supply device according to the present invention.

  As described above, the battery power supply device according to the present invention is a battery power supply device provided in an electronic device that can be connected to the battery and the charger via the first and second terminals. A charge control unit that is connected and controls power supply from the charger to the electronic device; a power supply unit that turns on / off power supply from the charge control unit to the load of the electronic device; and A power switch that is turned on / off by a power button, first and second switch units, a switch control unit that controls the second switch unit, and first and second powers that control activation of the power supply unit A power supply control unit, the power supply unit is provided between the charge control unit and the load, one end of the power switch is connected to a first terminal, and the first switch unit is a first switch 1 terminal and the above A first connection point between the switch and the charge control unit is provided, and one end of the second switch unit is a second connection point between the charge control unit and the power supply unit. The other end of the second switch unit, the other end of the power switch, and a third connection point between the power supply unit and the load are connected to each other at a fourth connection point. In addition, the first switch unit is connected to the first switch unit, and the first switch unit switches ON / OFF between the first connection point and the charge control unit depending on whether or not power is supplied from the fourth connection point. The second switch unit is configured between the second connection point and the fourth connection point according to ON / OFF control by the switch control unit and the presence / absence of power supply from the second connection point. The switch control unit is configured to switch ON / OFF. When the power switch is turned off, the second switch unit is controlled to be turned off. When the power switch is turned off, the first power supply control unit controls the power supply unit. The second power supply control unit is connected to the other end of the power switch, and when the power is supplied from the power switch, the power supply unit is started, so that power consumption can be easily reduced. There is an effect.

It is a block diagram which shows the structure of the portable terminal provided with the battery power supply device which concerns on embodiment of this invention. It is a flowchart which shows the procedure of the shutdown process of the said portable terminal. It is a flowchart which shows the starting process of the said portable terminal. It is a flowchart which shows the charge process of the said portable terminal at the time of storage mode. It is a block diagram which shows the structure of the conventional battery pack.

  One embodiment of the present invention will be described below with reference to FIGS.

(Configuration of mobile terminal 1)
FIG. 1 is a block diagram illustrating a configuration of a mobile terminal 1 including the battery power supply device according to the present embodiment. The mobile terminal 1 is a portable electronic device such as a mobile phone or a notebook personal computer.

  On the back side of the main body of the mobile terminal 1, there is a mounting portion (not shown) in which a battery 2 that is a rechargeable secondary battery can be mounted. The mounting portion is provided with a terminal T1, and the mobile terminal 1 is electrically connected to the battery 2 via the terminal T1. Moreover, the portable terminal 1 can be connected to the charger 3 through the terminal T2.

  As shown in FIG. 1, the mobile terminal 1 includes a power button 4, a system 5, a charging circuit 6, a power circuit 7, a power switch 8, a delay circuit 9, a first switch unit 11, a second switch unit 12, and a reset. IC13, system switch 14, three diodes D1-D3, and resistor R1 are provided. Among these components, the battery power supply according to the present embodiment includes a charging circuit 6, a power supply circuit 7, a power switch 8, a delay circuit 9, a first switch unit 11, a second switch unit 12, a reset IC 13, The system switch 14 includes three diodes D1 to D3, a resistor R1, and a switch control unit 5a and a power supply circuit control unit 5b of the system 5.

  The power button 4 is a button for the user to turn on / off the mobile terminal 1. When the power button 4 is pressed, signals are input to the power switch 8, the system switch 14, and the delay circuit 9.

  The system 5 is a block that is realized when a CPU provided in the mobile terminal 1 executes an operation system or an application installed in the mobile terminal 1, and performs arithmetic processing for executing various functions of the mobile terminal 1. Similar to a display device and a touch panel device (not shown), the system 5 is one of loads that consume power supplied to the mobile terminal 1. The system 5 includes a switch control unit 5a and a power supply circuit control unit 5b. These control units will be described later.

  The charging circuit 6 is connected to a terminal T <b> 2 for establishing electrical connection with the charger 3, and functions as a charge control unit that controls power supply from the charger 3 to the mobile terminal 1. When power is supplied from the charger 3 or the battery 2, the charging circuit 6 is activated.

  The power supply circuit 7 is composed of, for example, a DCDC converter, and is provided between the charging circuit 6 and the system 5. The power supply circuit 7 converts the voltage supplied from the charging circuit 6 to the system 5 and also functions as a power supply unit that turns on / off the power supply from the charging circuit 6 to the system 5. In addition, when the voltage of the system 5 is equal to the voltage supplied from the battery 2 and the charger 3, the power supply circuit 7 may be configured by a switch circuit.

  The power switch 8 is connected to the terminal T1 and functions as a power switch that is turned on / off by the power button 4.

  The first switch unit 11 is provided between the connection point N <b> 1 (first connection point) between the terminal T <b> 1 and the power switch 8 and the charging circuit 6. The second switch unit 12 is provided between a connection point N2 (second connection point) between the charging circuit 6 and the power supply circuit 7 and the anode of the diode D1.

  The anode of the diode D2 is connected to the power switch 8 via the delay circuit 9. The anode of the diode D3 is connected to a connection point N3 (third connection point) between the power supply circuit 7 and the system 5. The cathodes of the diodes D <b> 1 to D <b> 3 are connected to each other at the connection point N <b> 4 (fourth connection point) and to the first switch unit 11.

  The first switch unit 11 includes an FET switch 11a and an FET driver 11b. The source and drain (controlled terminal) of the FET switch 11a are connected to the connection point N1 and the charging circuit 6, respectively, and the gate (control terminal) of the FET switch 11a is connected to the output terminal of the FET driver 11b. The input terminal of the FET driver 11b is connected to the connection point N4. Thereby, the 1st switch part 11 is comprised so that ON / OFF between the connection point N1 and the charging circuit 6 may be switched by the presence or absence of the electric power supply from the connection point N4.

  The second switch unit 12 includes an FET switch 12a, an FET driver 12b, and a resistor R1. The source (one controlled terminal) of the FET switch 12a is connected to the connection point N2, the power supply terminal of the FET driver 12b and one end of the resistor R1, and the drain (the other controlled terminal) of the FET switch 12a is connected to the diode D1. Connected to the anode. The output terminal of the FET driver 12b is connected to the gate of the FET switch 12a. The input terminal of the FET driver 12b is connected to the other end of the resistor R1. A control signal from the switch control unit 5a of the system 5 is input to the input terminal of the FET driver 12b. Accordingly, the second switch unit 12 switches ON / OFF between the connection point N2 and the anode of the diode D1 depending on the ON / OFF control by the switch control unit 5a and the presence / absence of power supply from the connection point N2. Configured.

  The switch controller 5a controls the FET driver 12b to be turned off when the power button 4 is pressed and the power switch 8 is turned off while the mobile terminal 1 is operating. Thereby, the 2nd switch part 12 turns off.

  The power supply circuit controller 5b stops the power supply circuit 7 when the power button 4 is pressed and the power switch 8 is turned off while the mobile terminal 1 is operating.

  The reset IC 13 is connected to the power switch 8 through the delay circuit 9 together with the anode of the diode D2, and activates the power circuit 7 when power is supplied from the power switch 8.

(Shutdown process)
FIG. 2 is a flowchart showing the procedure of the shutdown process of the mobile terminal 1. In the portable terminal 1 before the shutdown process, the first switch unit 11, the second switch unit 12, the system switch 14, and the power supply circuit 7 are all in an ON state.

When the power button 4 is pressed in this state (“YES” in step S1), the power switch 8 is turned OFF and a signal indicating that the power button 4 has been pressed is input to the delay circuit 9. Further, when the power button 4 is continuously pressed for t _off or more (“YES” in step S2), the output signal from the delay circuit 9 becomes a low level, and the signal indicating that the power button 4 has been pressed to the system 5 Is entered. In response to this, the switch control unit 5a of the system 5 outputs a low level signal to the FET driver 12b and turns off the FET driver 12b. As a result, the FET switch 12a is also turned off (step S3).

  Subsequently, the power supply circuit control unit 5b of the system 5 stops the power supply circuit 7 (step S4). Thereby, since all the outputs of the diodes D1 to D3 are at the low level, the power supply from the connection point N4 to the first switch unit 11 is stopped. Therefore, the FET driver 11b is turned off, and then the FET switch 11a is also turned off (step S5).

  Here, since the power switch 8 and the FET switch 11a are in the OFF state, the power supply from the battery 2 to the portable terminal 1 is completely stopped. Therefore, the portable terminal 1 automatically shifts to a storage mode in which the battery 2 does not consume power by simply pressing the power button 4.

  In the storage mode, unlike the normal OFF mode, the battery 2 is not electrically connected to the charging circuit 6 and the power supply circuit 7, so that current consumption such as dark current is reduced. Therefore, the battery storage period can be extended compared to the conventional configuration.

(Start process)
Next, a process for starting the mobile terminal 1 in the storage mode will be described.

FIG. 3 is a flowchart showing the activation process of the mobile terminal 1. First, when the power button 4 of the portable terminal 1 is pressed (“YES” in step S11), the power switch 8 is turned on. At the same time, a signal indicating that the power button 4 has been pressed is input to the delay circuit 9, and power is supplied from the battery 2 to the delay circuit 9. Furthermore, when the power button 4 is _continuously pressed for t _ON1 or more (“YES” in step S12), power is supplied from the delay circuit 9 to the FET driver 11b and the reset IC 13. Thereby, the FET driver 11b is turned on, and then the FET switch 11a is also turned on (step S13).

  Since the power from the battery 2 is supplied to the charging circuit 6 by turning on the FET switch 11a, the charging circuit 6 is activated (step S14). Thereby, the electric power from the battery 2 is supplied to the power supply circuit 7 and the second switch unit 12, the FET driver 12b is turned on, and then the FET switch 12a is also turned on (step S15).

Furthermore,, High-level signal from the reset IC13 is output ( "YES" in step S16) If the power key 4 is held down _t on2 _(t on2 _{-t on1} = delay time of the reset IC13) above, the power supply circuit 7 Is activated (step S17). Thereby, the electric power from the battery 2 is supplied to the system 5, and the starting process of the portable terminal 1 is completed.

  Conventionally, when the portable terminal in the storage mode is activated, it is necessary to connect the portable terminal to the charger. However, in this embodiment, the portable terminal 1 is activated in the storage mode without being connected to the charger. can do.

  In step S14, if the power button 4 is released before the charging circuit 6 is activated, the FET driver 11b and the FET switch 11a are turned off, and the storage mode is restored.

(Charging process in storage mode)
Next, the charging process of the mobile terminal 1 in the storage mode will be described. In the portable terminal 1 in the storage mode, the first switch unit 11, the second switch unit 12, the charging circuit 6, and the power supply circuit 7 are all in an OFF state.

  FIG. 4 is a flowchart showing a charging process of the mobile terminal 1 in the storage mode. When charger 3 is connected to portable terminal 1 (“YES” in step S21), charging circuit 6 is activated (step S22). Thereby, the electric power from the charger 3 is supplied to the second switch unit 12, the FET driver 12b is turned on, and then the FET switch 12a is also turned on (step S23). Therefore, the power from the charger 3 is supplied to the first switch unit 11, the FET driver 11b is turned on, and then the FET switch 11a is also turned on (step S24). Thereby, the electric power from the charger 3 is supplied to the battery 2, and charging is started (step S25).

  Thereafter, when charger 3 is removed (“YES” in step S26), charging circuit 6 is stopped (step S27), and power supply from charger 3 to second switch unit 12 is stopped. Therefore, the FET driver 12b is turned off, and then the FET switch 12a is also turned off (step S28). Thereby, the power supply from the charger 3 to the first switch unit 11 is also stopped. Therefore, the FET driver 11b is turned off, and then the FET switch 11a is also turned off (step S29). Thereby, the portable terminal 1 shifts to the storage mode (step S30).

  Thus, when the charger 3 is removed from the portable terminal 1 after the start of charging, the portable terminal 1 automatically shifts to the storage mode again.

  In addition, after charging is started, the charger 3 is connected (“NO” in step S26), and when the power button 4 is pressed (“YES” in step S31), the power supply circuit 7 is activated ( In step S32), power is supplied to the system of the portable terminal 1.

(Additional notes)
In the embodiment described above, the first and second switch units 11 and 12 are configured to include the FET switch and the FET driver, but the present invention is not limited to this. The FET driver of the first and second switch units 11 and 12 may be replaced with an FET switch or a transistor, or the first and second switch units 11 and 12 may be configured with a driver built-in. You may comprise with one switch IC.

  For example, in the configuration in which the FET driver 11b of the first switch unit 11 is replaced with an FET switch, the source of the FET switch is connected to the connection point N1 or GND, and the drain of the FET switch is connected to the gate of the FET switch 11a. The gate of the FET switch is connected to the connection point N4.

  In the configuration in which the FET driver 12b of the second switch unit 12 is replaced with an FET switch, the source of the FET switch is connected to the connection point N2, the drain of the FET switch is connected to the gate of the FET switch 12a, and The gate of the FET switch is connected to the resistor R1.

  In the above-described embodiment, when the shutdown process is performed, the configuration automatically shifts to the storage mode. However, the normal OFF mode may be enabled by user selection or setting. For example, when the power button 4 is pressed, a dialog for selecting whether to shift to the storage mode or the normal OFF mode may be displayed, and the user may select which mode to shift to. Alternatively, the mode may be shifted to the storage mode only when the portable terminal is shipped, and may be shifted only to the normal OFF mode when used by the user.

  In the embodiment described above, the delay circuit 9 is provided in the mobile terminal 1, but the delay circuit 9 is not an essential component. When the delay circuit 9 is not provided, step S2 shown in FIG. 2 and step S12 shown in FIG. 3 are omitted. That is, immediately after the power button 4 is pressed, the shutdown process or the startup process is started.

  In the above-described embodiment, the FET driver 12b of the second switch unit 12 is controlled by the switch control unit 5a of the system 5, but the FET driver 12b is controlled to be turned on / off according to the output of the power supply circuit 7. It may be configured to. That is, the input terminal of the FET driver 12b may be connected to the connection point N3. In this case, when the shutdown process is performed, the mode is always shifted to the storage mode without the intervention of the system 5.

  The three diodes D1 to D3 are provided from the viewpoint of product safety and operational stability, and the object of the present invention can be achieved even if the diodes D1 to D3 are omitted. is there. That is, the diodes D1 to D3 are not essential components.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  The present invention is suitable for a portable terminal device using a rechargeable battery.

1 Mobile terminal (electronic equipment)
2 Battery 3 Charger 4 Power button 5 System (load)
5a Switch control unit 5b Power supply circuit control unit (first power supply control unit)
6 Charging circuit (charging controller)
7 Power supply circuit (power supply unit)
8 power switch 9 delay circuit 11 first switch unit 11a FET switch 11b FET driver 12 second switch unit 12a FET switch 12b FET driver 13 reset IC (second power supply control unit)
14 System switch D1 Diode (first diode)
D2 diode (second diode)
D3 diode (third diode)
N1 connection point (first connection point)
N2 connection point (second connection point)
N3 connection point (third connection point)
N4 connection point (fourth connection point)
R1 resistor T1 terminal (first terminal)
T2 terminal (second terminal)

Claims (5)

A battery power supply device provided in an electronic device connectable to a battery and a charger via first and second terminals,
A charge control unit connected to a second terminal for controlling power supply from the charger to the electronic device;
A power supply unit for turning on / off power supply from the charge control unit to the load of the electronic device;
A power switch that is turned ON / OFF by a power button of the electronic device;
First and second switch sections;
A switch control unit for controlling the second switch unit;
A first and a second power supply control unit for controlling the activation of the power supply unit,
The power supply unit is provided between the charge control unit and the load,
One end of the power switch is connected to the first terminal,
The first switch unit is provided between the first connection point between the first terminal and the power switch, and the charge control unit,
One end of the second switch unit is connected to a second connection point between the charge control unit and the power supply unit,
The other end of the second switch unit, the other end of the power switch, and the third connection point between the power supply unit and the load are connected to each other at the fourth connection point, and the first Connected to the switch section of
The first switch unit is configured to switch ON / OFF between the first connection point and the charge control unit depending on whether power is supplied from the fourth connection point.
The second switch unit switches ON / OFF between the second connection point and the fourth connection point according to the ON / OFF control by the switch control unit and the presence / absence of power supply from the second connection point. Configured as
The switch control unit controls the second switch unit to be turned off when the power switch is turned off,
The first power supply control unit stops the power supply unit when the power switch is turned off,
The second power supply control unit is connected to the other end of the power switch, and activates the power supply unit when power is supplied from the power switch. A first diode provided between the other end of the second switch section and a fourth connection point;
A second diode provided between the other end of the power switch and a fourth connection point;
A third diode provided between the third connection point and the fourth connection point;
The anode of the first diode is connected to the other end of the second switch unit,
The anode of the second diode is connected to the other end of the power switch,
The anode of the third diode is connected to a third connection point;
2. The battery power supply device according to claim 1, wherein each cathode of the first to third diodes is connected to a fourth connection point. The first switch unit includes a first FET switch and a first FET driver,
The two controlled terminals of the first FET switch are connected to the first connection point and the charging control unit, respectively, and the control terminal of the first FET switch is connected to the output terminal of the first FET driver,
The battery power supply device according to claim 1, wherein an input terminal of the first FET driver is connected to a fourth connection point. The second switch unit includes a second FET switch, a second FET driver, and a resistor.
One controlled terminal of the second FET switch is connected to the second connection point, the power supply terminal of the second FET driver and one end of the resistor, and the other controlled terminal of the second FET switch is connected to the second controlled terminal. Connected to the anode of one diode,
The output terminal of the second FET driver is connected to the gate of the second FET switch, the input terminal of the second FET driver is connected to the other end of the resistor, and the input terminal of the second FET driver is connected to the input terminal of the second FET driver. The battery power supply device according to claim 2, wherein a control signal is input from the switch control unit.   An electronic apparatus comprising the battery power supply device according to claim 1.

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