JP2016015807A - Power supply device, electronic apparatus and program for preventing breakage by short circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of an electronic apparatus due to a short circuit between a terminal used for charging of a secondary battery and a peripheral conductive material when charging for the secondary battery built in the electronic apparatus is performed.SOLUTION: An electronic apparatus repeats a behavior of performing charging of a secondary battery for a charging timer time t8 when power is supplied from a power supply adapter, and subsequently stopping the charging for a stopping timer time t9. During power supply to the electronic apparatus, the power supply adapter repeats clocking of a protection timer time t6(t8<t6) after reset while continuing power supply to the electronic apparatus when a current passing from an output terminal to the electronic apparatus decreases to a value less than a threshold value a1 before the protection timer time t6 has elapsed and subsequently the current increases to a value exceeding a threshold value a2 after the stopping timer time t9 has elapsed. On the other hand, when the current does not decrease to the value less then the threshold value a1 before the protection timer time t6 has not elapsed, the power supply adapter stops power supply to the electronic apparatus.

Description

  The present invention relates to a technique for preventing damage of an electronic device due to a short circuit in the electronic device.

  A short circuit in an electronic device may cause damage to the electronic device. Therefore, a technique for preventing damage to the electronic device due to a short circuit has been proposed.

  For example, Patent Document 1 proposes a mechanism for detecting a short circuit between terminals of a resistor by comparing a voltage of a resistor used for measuring a current value flowing through a primary winding in an inverter with a threshold value. ing.

  For example, Patent Document 2 discloses an electronic circuit that drives a switch element by stopping application to the switch element when a voltage applied to the switch element is higher than a threshold value for a predetermined time or longer. Has been proposed to avoid damage due to overcurrent.

JP 2013-150456 A JP 2013-34384 A

  Many portable electronic devices receive power from a built-in secondary battery. When a secondary battery built in a portable electronic device is charged by wire, an external power source is electrically connected to a terminal exposed outside the casing of the portable electronic device. If the terminal of the portable electronic device used for charging the secondary battery is short-circuited with a conductor in the vicinity of the terminal, a part of the power supplied from the external power source when the secondary battery is charged There is a risk that the electric conductor and the short circuit path are heated by being supplied to a nearby electric conductor and the portable electronic device is damaged.

  In recent years, an increasing number of portable electronic devices do not include a cap that covers a terminal used for charging when not in use. In addition, portable electronic devices that have a waterproof function are increasing. As a result, there is an increased risk that the terminal of the portable electronic device is short-circuited with a conductor around the terminal through foreign matters such as water, spilled drinks, and user sweat.

  In view of the above circumstances, the present invention is based on a short circuit between a terminal used for charging a secondary battery and a conductor around the terminal when the secondary battery built in the electronic device is charged. An object of the present invention is to provide means for preventing damage to an electronic device.

  In order to solve the above-described problems, the present invention provides a terminal for supplying power to an electronic device, and a power supply means for supplying power to the electronic device connected to the terminal by applying a voltage to the terminal. An ammeter that measures a current flowing from the power supply means to the electronic device connected to the terminal, and a timer that measures the time, wherein the power supply means applies a voltage to the terminal. When the current flowing to the electronic device connected to the terminal falls below a predetermined threshold before a predetermined time elapses from the reference time, the reference time is changed to a time after the time of the decrease and the terminal The predetermined time has elapsed from the reference time without causing the current flowing to the electronic device connected to the terminal to fall below a predetermined threshold. Until the predetermined time has elapsed from the reference time without the current flowing to the electronic device connected to the terminal decreasing below a predetermined threshold, and the voltage application to the terminal is stopped. A power supply device is proposed.

  In the above power supply device, the power supply means follows the first period from the predetermined time used in the first period that starts from the start timing of power supply to the electronic device connected to the terminal. A configuration may be employed in which the predetermined time used in the second period is lengthened.

  In the above power supply device, when the predetermined time is the first predetermined time, the power supply means supplies the electronic device connected to the terminal in a state where a voltage is applied to the terminal. A configuration is adopted in which the application of voltage to the terminal is stopped when a state in which the flowing current has decreased below the predetermined threshold continues for a second predetermined time different from the first predetermined time. Also good.

  Further, in the above power supply apparatus, the voltage applied to the terminal is applied when the predetermined time has elapsed from the reference time without the current flowing to the electronic device connected to the terminal decreasing below a predetermined threshold. A configuration may be employed in which a notification unit that performs a predetermined notification when it is stopped is provided.

  The present invention also provides a terminal for receiving power supplied from a power supply device, a secondary battery, a charging means for charging the secondary battery with power supplied via the terminal, and a time count. A timer for performing the processing, wherein the charging unit stops charging the secondary battery for a second predetermined time every time the first predetermined time elapses after starting charging the secondary battery. The electronic apparatus is characterized by repeating until charging of the secondary battery is completed.

  In the above electronic device, the charging unit is configured to have a second period subsequent to the first period than the first predetermined period used in the first period starting from a charging start timing for the secondary battery. A configuration may be employed in which the first predetermined time used in is extended.

  In addition, the present invention includes any one of the above-described power supply devices and any one of the above-described electronic devices that receive power supplied from the power supply device, and is used by the power supply unit of the power supply device. The charging system is characterized in that the predetermined time is longer than the first predetermined time used by the charging means of the electronic device.

  The present invention also provides a terminal for receiving power supplied from a power supply device, a secondary battery, a charging means for charging the secondary battery with power supplied via the terminal, and a time count. A computer having a timer to perform, after the charging of the secondary battery by the charging means is started, the charging of the secondary battery is stopped for a second predetermined time every elapse of the first predetermined time A program for repeatedly executing the processing until the charging of the secondary battery is completed is proposed.

  According to the present invention, while the power supplied from the power supply device is charged to the secondary battery built in the electronic device, the terminal used for charging the electronic device periodically and the conductor around the terminal are connected. It is confirmed whether or not a short circuit has occurred in the meantime. If a short circuit has occurred, the power supply from the power supply device to the electronic device is stopped. As a result, it is avoided that charging of the secondary battery in a situation where a short circuit has occurred continues beyond a predetermined time, and damage to the electronic device is prevented.

The figure which showed the structure of the charging system concerning one Embodiment. The figure which illustrated the hardware constitutions of the electronic device concerning one embodiment. The figure which showed the flow of the process (standby mode) of the power adapter concerning one Embodiment. The figure which showed the flow (standby mode) of the process of the electronic device concerning one Embodiment. The figure which showed the time chart (at the time of standby mode, unconnected) of the voltage which the power adapter concerning one Embodiment applies, and the electric current which flows into an electronic device. The figure which showed the time chart (at the time of a standby mode and connection) of the voltage which the power adapter concerning one Embodiment applies, and the electric current which flows into an electronic device. The figure which showed the flow of the process (charge mode) of the power adapter concerning one Embodiment. The figure which showed the flow of the process (charge mode) of the electronic device concerning one Embodiment. The figure which showed the time chart (charge mode, normal time) of the voltage which the power adapter concerning one Embodiment applies, and the electric current which flows into an electronic device. The figure which showed the time chart (Charging mode, at the time of short circuit occurrence) of the voltage which the power adapter concerning one Embodiment applies, and the electric current which flows into an electronic device.

[Embodiment]
Below, the charging system 1 concerning one Embodiment of this invention is demonstrated. FIG. 1 is a diagram showing a configuration of the charging system 1. The charging system 1 includes a power adapter 11 that supplies power to the electronic device 12 using power supplied from the power source 9, and an electronic device 12 that receives power from the power adapter 11.

  The power adapter 11 is supplied from the power supply 9 via the input terminal 111 that receives power supplied from the power supply 9, an output terminal 112 (an example of a terminal) for supplying power to the electronic device 12, and the input terminal 111. A power supply unit 113 (an example of a power supply unit) that supplies power to the electronic device 12 connected to the output terminal 112 by applying a rated voltage to the output terminal 112 using the generated power, and a timer that counts time 114 (an example of a timer), an ammeter 115 (an example of an ammeter) that measures a current flowing from the power supply unit 113 to the electronic device 12 via the output terminal 112, and an abnormal supply of power to the electronic device 12 A lamp 116 (an example of a notification unit) that notifies the user of an abnormal stop by turning on or blinking in a predetermined manner when stopped (described later). The power adapter 11 is an example of a power supply device that supplies power to the electronic device 12. If the rated voltage can be supplied, the power adapter 11 has adapter functions such as conversion between AC and DC, transformation, and rectification. A non-power supply device may be employed instead of the power adapter 11.

  The power supply unit 113 performs AC / DC conversion, DC / DC conversion, or the like on the power supplied from the power supply 9 as necessary, and then supplies the power to the electronic device 12.

  The electronic device 12 includes a terminal 121 (an example of a terminal) for receiving power supplied from the power adapter 11, a secondary battery 122 (an example of a secondary battery), and a charging unit 123 (an example of a charging unit). , A timer 124 (an example of a timer) for measuring time is provided. The charging unit 123 includes a charging circuit 1231 that is a circuit that charges the secondary battery 122 and a control unit 1232 that controls the charging circuit 1231.

  FIG. 2 is a diagram illustrating a hardware configuration of the electronic device 12. The electronic device 12 illustrated in FIG. 2 is a computer incorporating the secondary battery 122, and the type thereof is not limited, such as a tablet PC, a notebook PC, a smartphone, and a portable game machine.

  The electronic device 12 stores various data such as an OS, application program, user data, etc. in addition to the terminal 121, the secondary battery 122, the timer 124, and the charging circuit 1231 described above, and a memory used as a work area when the program is executed. 100 and a processor 101 such as a CPU that performs various data processing in accordance with a program stored in the memory 100. In the present embodiment, the control unit 1232 is realized by the processor 101 executing a process according to an application program stored in the memory 100. However, the control unit 1232 may be realized by hardware such as a logic integrated circuit.

  The charging system 1 operates in one of two operation modes, a standby mode and a charging mode. The standby mode is an operation mode from the time when the power adapter 11 is connected to the power source 9 until the confirmation that the electronic device 12 is connected to the power adapter 11 and no short circuit has occurred. The charging mode is an operation mode from completion of confirmation that no short circuit has occurred until completion of charging (or release of connection between the electronic device 12 and the power adapter 11).

  FIG. 3 is a diagram illustrating a processing flow of the power adapter 11 in the standby mode. The operation of the power supply adapter 11 in the standby mode is started with the connection of the power supply adapter 11 to the power supply 9 as a trigger. In the standby mode, the power supply unit 113 of the power adapter 11 first initializes a counter i that counts the number of rises (described later) of the current measured by the ammeter 115 with “0” (S101). Subsequently, the power supply unit 113 starts application of a voltage to the output terminal 112, and sets the standby timer time t1 in the timer 114 to start measuring time (S102).

  Subsequently, the power supply unit 113 changes the current measured by the ammeter 115 from a value less than the threshold value a1 to a value exceeding the threshold value a2 (where a1 <a2) (hereinafter, this change is referred to as “rise”). Is determined (S103). When the rising edge is not detected in the determination of S103 (S103; No), the power supply unit 113 determines the elapse of the standby timer time t1 (S104). When the standby timer time t1 has not elapsed (S104; No), the power supply unit 113 returns the process to S103. On the other hand, when the standby timer time t1 has elapsed (S104; Yes), the power supply unit 113 stops applying the voltage to the output terminal 112 and sets the stop timer time t2 in the timer 114 to start measuring time (S105). ).

  Subsequently, the power supply unit 113 determines whether the stop timer time t2 has elapsed (S106). When the stop timer time t2 has not elapsed (S106; No), the power supply unit 113 repeats the determination of S106 at predetermined time intervals. On the other hand, when the stop timer time t2 has elapsed (S106; Yes), the power supply unit 113 returns the process to S102.

  If the rising edge is detected in the determination of S103 (S103; Yes), the power supply unit 113 adds “1” to the counter i (S107), and then the counter i is a constant c (hereinafter, c = 4 as an example). (S108). When the counter i is not c (S108; No), the power supply unit 113 returns the process to S102. On the other hand, when the counter i is c (S108; Yes), the power supply unit 113 ends the operation in the standby mode and switches the operation mode to the charging mode.

  FIG. 4 is a diagram illustrating a processing flow of the electronic device 12 in the standby mode. The operation of the electronic device 12 in the standby mode is triggered by the connection of the electronic device 12 to the power adapter 11 as a trigger. In the standby mode, the electronic device 12 control unit 1232 first sets the transition timer time t3 in the timer 124 and starts measuring time (S201). Subsequently, the control unit 1232 causes the charging circuit 1231 to start charging, and sets the charging timer time t4 to the timer 124 to start timing (S202).

  Subsequently, the control unit 1232 determines whether the charging timer time t4 has elapsed (S203). When the charging timer time t4 has not elapsed (S203; No), the control unit 1232 repeats the determination of S203 at predetermined time intervals. On the other hand, when the charging timer time t4 has elapsed (S203; Yes), the control unit 1232 causes the charging circuit 1231 to stop charging and sets the stop timer time t5 to the timer 124 to start measuring time (S204).

  Subsequently, the control unit 1232 determines the elapse of the stop timer time t5 (S205). When the stop timer time t5 has not elapsed (S205; No), the control unit 1232 repeats the determination of S205 at predetermined time intervals. On the other hand, when the stop timer time t5 has elapsed (S205; Yes), the control unit 1232 determines whether the transition timer time t3 set in S201 has elapsed (S206). When the transition timer time t3 has not elapsed (S206; No), the control unit 1232 returns the process to S202. On the other hand, when the transition timer time t3 has elapsed (S206; Yes), the control unit 1232 ends the operation in the standby mode and switches the operation mode to the charge mode.

  According to the flow shown in FIG. 3, the power supply unit 113 of the power adapter 11 applies the voltage shown in the time chart of FIG. 5 to the output terminal 112 until the electronic device 12 is connected to the power adapter 11. . That is, when the power adapter 11 is connected to the power source 9, the power supply unit 113 applies voltage to the output terminal 112 for the standby timer time t1, and then stops applying voltage to the output terminal 112 for the stop timer time t2. Repeat the operation. The standby timer time t1 is, for example, about 5 seconds, and the stop timer time t2 is, for example, about 2 seconds.

  In the standby mode, while the electronic device 12 is not charged, the application of the voltage to the output terminal 112 is intermittently performed as shown in FIG. Even if a short circuit occurs between the terminal 121 and the peripheral conductors in a state where the electronic device 12 is connected to the electronic device 12, heat generation of the electronic device 12 is suppressed.

  Further, after the electronic device 12 is connected to the power adapter 11, the power adapter 11 operates according to the flow shown in FIG. 3, and the electronic device 12 operates according to the flow shown in FIG. The voltage applied to the terminal 112 and the current measured by the ammeter 115 are as shown in the time chart of FIG.

  That is, when the electronic device 12 is connected to the power adapter 11, a state in which almost no current flows (less than the threshold value a1) after the current exceeding the threshold value a2 flows through the output terminal 112 for the charging timer time t4 is a stop timer. The state change of continuing for time t5 is repeated by a number one less than the constant c. The charge timer time t4 is, for example, about 3 seconds, and the stop timer time t5 is, for example, about 1 second.

  Thereafter, the charging mode is entered, and a current exceeding the threshold value a2 continuously flows through the output terminal 112. Further, when the electronic device 12 is connected to the power adapter 11, the power supply unit 113 continuously applies a voltage to the output terminal 112. This is because the standby timer time t1 is reset when the current measured by the ammeter 115 rises before the standby timer time t1 elapses.

  When a short circuit occurs before the electronic device 12 is connected to the power adapter 11 or when a short circuit occurs in a period immediately after the connection (before the transition timer time t3 has elapsed), the current measured by the ammeter 115 is In the period of the stop timer time t5, it does not fall below the threshold value a1, and a sufficient rise is not detected before the standby timer time t1 elapses. As a result, the power adapter 11 does not switch to the charging mode and repeats intermittent application of the voltage shown in FIG. In that case, although the voltage is applied from the power adapter 11 to the short-circuited electronic device 12, since it is intermittently performed, heat generation in the electronic device 12 is suppressed and damage is avoided.

  Next, the operation of the charging system 1 in the charging mode will be described. FIG. 7 is a diagram illustrating a processing flow of the power adapter 11 in the charging mode. In the charging mode, the power supply unit 113 first sets the protection timer time t6 in the timer 114 to start measuring time, and continues to apply voltage to the output terminal 112 (S301).

  Subsequently, the power supply unit 113 determines whether the current measured by the ammeter 115 has changed from a value exceeding the threshold value a2 to a value less than the threshold value a1 (hereinafter, this change is referred to as “falling”). (S302). When the falling is not detected in S302 (S302; No), the power supply unit 113 determines the elapse of the protection timer time t6 (S303). When the protection timer time t6 has not elapsed (S303; No), the power supply unit 113 returns the process to S302. When the falling is detected in S302 (S302; Yes), the power supply unit 113 sets the charging stop detection timer time t7 in the timer 114 and starts measuring time (S304).

  Subsequently, the power supply unit 113 determines whether a current has risen (S305). When the rising of the current is detected (S305; No), the power supply unit 113 returns the process to S301. As a result, the power supply unit 113 continues to apply a voltage to the output terminal 112.

  On the other hand, when the rising edge of the current is not detected in S305 (S305; No), the power supply unit 113 determines the elapse of the charge stop detection timer time t7 (S306). When the charge stop detection timer time t7 has not elapsed (S306; No), the power supply unit 113 returns the process to S305. On the other hand, when the charging stop detection timer time t7 has elapsed (S306; Yes), the power supply unit 113 switches the operation mode to the standby mode. The case where the charging stop detection timer time t7 elapses usually means that the charging of the electronic device 12 is completed or the connection of the electronic device 12 to the power adapter 11 is released. In such a case, the power adapter 11 shifts to the standby mode and continues to apply the voltage as shown in FIG.

  In S303, when the protection timer time t6 has elapsed (S303; Yes), the power supply unit 113 stops the application of the voltage to the output terminal 112, and also starts the notification indicating the abnormal stop to the lamp 116 (S307).

  FIG. 8 is a diagram illustrating a processing flow of the electronic device 12 in the charging mode. In the charging mode, the control unit 1232 first causes the charging circuit 1231 to continue charging, and sets the charging timer time t8 in the timer 124 to start measuring time (S401). Subsequently, the control unit 1232 determines whether the charging timer time t8 has elapsed (S402). When the charging timer time t8 has not elapsed (S402; No), the control unit 1232 repeats S402 at predetermined time intervals. On the other hand, when the charging timer time t8 has elapsed (S402; Yes), the control unit 1232 causes the charging circuit 1231 to stop charging and sets the stop timer time t9 in the timer 124 to start measuring time (S403).

  Subsequently, the control unit 1232 determines whether the stop timer time t9 has elapsed (S404). When the stop timer time t9 has not elapsed (S404; No), the control unit 1232 repeats S404 at predetermined time intervals. On the other hand, when the stop timer time t9 has elapsed (S404; Yes), the control unit 1232 returns the process to S401. Thereby, the temporarily stopped charging is resumed.

  While the processes of S401 to S404 are performed, the charging circuit 1231 determines whether the secondary battery 122 is fully charged at predetermined time intervals (S405). When the battery is fully charged (S405; Yes), the charging circuit 1231 stops charging, and the electronic device 12 ends the operation in the charging mode.

  In the charging mode, the power adapter 11 operates according to the flow shown in FIG. 7 and the electronic device 12 operates according to the flow shown in FIG. 8. As a result, voltage application to the output terminal 112 of the power supply unit 113 and ammeter 115 The current measured by is as shown in the time chart of FIG.

  That is, the current measured by the ammeter 115 maintains a value that exceeds the threshold value a2 for the charging timer time t8, and then the state change that the current hardly flows (less than the threshold value a1) continues for the stop timer time t9. Is repeated until the charging of the electronic device 12 is completed (or the connection of the electronic device 12 to the power adapter 11 is released). The charging timer time t8 is much longer than the charging timer time t4 in the standby mode, for example, about 25 minutes. Further, the stop timer time t9 is about the same as the stop timer time t5 in the standby mode, for example, about 1 second.

  In the charging mode, the power supply unit 113 is connected to the output terminal 112 until the charging stop detection timer time t7 elapses after completion of charging in the electronic device 12 (or disconnection of the electronic device 12 from the power adapter 11). During this time, a voltage is continuously applied, and then the mode is shifted to a standby mode, and intermittent voltage application is repeated. The charge stop detection timer time t7 may be a time sufficiently longer than the stop timer time t9, for example, about 10 seconds. In the charging mode, the voltage application to the output terminal 112 is continued until the charging in the electronic device 12 is completed because the current measured by the ammeter 115 rises before the protection timer time t6 elapses. This is because resetting is performed. Therefore, the protection timer time t6 needs to be longer than the charging timer time t8, and is, for example, about 30 minutes.

  While the charging system 1 is operating in the charging mode, when a short circuit occurs between the terminal 121 and its peripheral conductor due to, for example, a drink spilled on the terminal 121 of the electronic device 12 The voltage application to the output terminal 112 and the current flowing through the output terminal 112 are as shown in the time chart of FIG.

  That is, after the short circuit occurs, even if the control unit 1232 causes the charging circuit 1231 to periodically stop charging in the electronic device 12, the terminal 121 and the surrounding conductor are short-circuited. A current exceeding the threshold value a <b> 1 continues to flow to the electronic device 12. As a result, the protection timer time t6 elapses without the power supply unit 113 of the power adapter 11 being able to detect the rise of current. As a result, the power supply unit 113 stops applying the voltage to the output terminal 112, and no current flows from the output terminal 112 to the electronic device 12.

  As described above, according to the charging system 1, when a short circuit occurs around the terminal 121 of the electronic device 12 when the electronic device 12 is connected to the power adapter 11, the power adapter 11 sends the electronic device 12 to the electronic device 12. Since intermittent voltage application is performed, heat generation is reduced and damage to the electronic device 12 is avoided. Further, according to the charging system 1, when a short circuit occurs around the terminal 121 of the electronic device 12 after the electronic device 12 is connected to the power adapter 11 and charging is started, the power adapter 11 is connected to the electronic device 12. The power supply will not continue beyond the protection timer time t6. Therefore, even if a short circuit occurs during charging of the electronic device 12, damage due to heat generation of the electronic device 12 is avoided.

[Modification]
The above-described charging system 1 is an embodiment of the present invention, and can be variously modified within the scope of the technical idea of the present invention. Examples of these modifications are shown below. Two or more of the above-described embodiments and the following modifications may be combined as appropriate.

(1) In the embodiment described above, the standby timer time t1 and the protection timer time t6 in the power adapter 11 are reset at the rising timing of the current measured by the ammeter 115. Instead, the falling timing of the current measured by the ammeter 115 may be adopted as the reset timing.

(2) In the above-described embodiment, in the standby mode, when the current indicated by the ammeter 115 does not show a sufficient rise (or fall) by a predetermined number of times due to a short circuit, the power adapter 11 applies intermittent voltage. Continue. Instead, in the standby mode, as in the charging mode, when the current indicated by the ammeter 115 does not show a sufficient rise (or fall), the power adapter 11 stops supplying voltage to the electronic device 12. May be adopted.

(3) In the above-described embodiment, when the power supply of the power adapter 11 is abnormally stopped, the user needs to once disconnect the power adapter 11 and the power source 9 in order to use the power adapter 11. In order to reduce the effort for that, for example, the power adapter 11 is provided with an operator such as a button operated by the user, and the power supply unit 113 starts the operation in the standby mode in response to an operation on the operator by the user. A configuration may be employed.

(4) Details of numerical values and operation flows used in the description of the above-described embodiments are merely examples, and may be variously changed.

DESCRIPTION OF SYMBOLS 1 ... Charging system, 9 ... Power supply, 11 ... Power adapter, 12 ... Electronic device, 100 ... Memory, 101 ... Processor, 111 ... Input terminal, 112 ... Output terminal, 113 ... Power supply part, 114 ... Timer, 115 ... Current 116, lamp, 121, terminal, 122, secondary battery, 123, charging unit, 124, timer, 1231, charging circuit, 1232, control unit

Claims (8)

A terminal for supplying power to the electronic device;
Power supply means for supplying power to an electronic device connected to the terminal by applying a voltage to the terminal;
An ammeter for measuring a current flowing from the power supply means to the electronic device connected to the terminal;
And a timer that counts time,
The power supply means, when a voltage is applied to the terminal, when the current flowing to the electronic device connected to the terminal before a predetermined time has elapsed from a reference time falls below a predetermined threshold, In the process of changing the reference time to a time after the time of the decrease and continuing to apply the voltage to the terminal, the current flowing to the electronic device connected to the terminal is reduced below a predetermined threshold. Without repeating the predetermined time from the reference time until the predetermined time elapses, and when the predetermined time elapses from the reference time without the current flowing to the electronic device connected to the terminal falling below a predetermined threshold, A power supply device, characterized in that application of voltage to is stopped. The power supply means is used in a second period subsequent to the first period rather than the predetermined time used in the first period starting from the start timing of power supply to the electronic device connected to the terminal. The power supply device according to claim 1, wherein the predetermined time is lengthened. When the predetermined time is defined as a first predetermined time, the power supply means is configured to apply a voltage to the terminal so that a current flowing to the electronic device connected to the terminal is less than the predetermined threshold. 3. The power supply device according to claim 1, wherein when the lowered state continues for a second predetermined time different from the first predetermined time, application of a voltage to the terminal is stopped. . A predetermined notification when the application of voltage to the terminal is stopped because the predetermined time has elapsed since the reference time without the current flowing to the electronic device connected to the terminal decreasing below a predetermined threshold. The power supply apparatus according to claim 1, further comprising a notification unit that performs the following. A terminal for receiving power supplied from the power supply device;
A secondary battery,
Charging means for charging the secondary battery with power supplied via the terminal;
And a timer that counts time,
After the charging unit starts charging the secondary battery, the charging unit stops charging the secondary battery for a second predetermined time every time the first predetermined time elapses. An electronic device that is repeated until charging is completed. The charging means uses the first period used in a second period following the first period rather than the first predetermined time period used in the first period starting from the charging start timing for the secondary battery. The electronic device according to claim 5, wherein the predetermined time is lengthened. A power supply device according to any one of claims 1 to 4, and an electronic device according to claim 5 or 6, which receives power supplied from the power supply device.
The charging system, wherein the predetermined time used by the power supply unit of the power supply apparatus is longer than the first predetermined time used by the charging unit of the electronic device. A terminal for receiving power supplied from the power supply device;
A secondary battery,
Charging means for charging the secondary battery with power supplied via the terminal;
In a computer equipped with a timer for measuring time,
After the charging of the secondary battery by the charging unit is started, the charging of the secondary battery is stopped for the second predetermined time every time the first predetermined time elapses. A program that is repeatedly executed until charging is completed.

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