JP2008259256A - Charge control method and system of portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prolong the lifetime of a battery by reducing the charging cycle of the battery effectively without spoiling the user's feeling of use and convenience of a portable terminal. <P>SOLUTION: A portable terminal 2 incorporating a battery 7 judges the number of times of connecting with an AC adapter 1 within a unit time and the average battery voltage at the time of connection every predetermined unit time, and alters the charging start voltage based on the judgment result. If the charging start voltage has been altered to a low level at the time of connecting with the AC adapter 1, the portable terminal 2 refers to the connection record of the AC adapter 1 even if the voltage of the battery 7 is higher than the charging start voltage, and starts charging if predetermined conditions are satisfied (e. g. the portable terminal 2 has been connected with the AC adapter 1 for a predetermined time continuously). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a charging control method for a portable terminal device and a charging control method for the portable terminal device.

  Regarding this type of charging control method for a portable terminal device, a related technique will be described. A mobile phone is an example of a portable terminal device that has a secondary battery such as a lithium ion battery as an operating power source and is charged and used by connection to an AC adapter. In that case, in order to improve the user's convenience, for example, an AC adapter called a desktop holder having a charging function and a holding / storage function of a mobile phone is often used. Among the user's usage methods, there is a case where the desktop holder is placed close to the user, and when the mobile phone is used, it is detached from the desktop holder and used, and the mobile phone is held / stored in the desktop holder after use. is there.

  A user who frequently performs such an operation places importance on the holding / storage function rather than the charging purpose. However, the desktop holder having the charging function charges a slightly used battery every time. That is, since the amount of battery used per time is small, charging is unconditionally performed even though charging is not normally performed, although it can be used after the second time. If the frequency is high, the number of times of charging is unnecessarily accumulated to advance the charging cycle. It is well known that the charge cycle is a factor that determines the life of the lithium ion battery, and that the charge cycle is accelerated and the life of the lithium ion battery is deteriorated by increasing the number of times of charging.

  An example of such a related charge control method is shown in FIG. When the AC adapter is connected to the portable terminal device (step S701), the voltage of the battery built in the portable terminal device is detected by a detector or measured by an AD converter (step S702). When it is determined that the measured voltage is a voltage at which charging should be started (step S703), charging is started (step S704).

  Hereinafter, a voltage that is a criterion for determining whether or not the battery voltage is to be charged is referred to as a charging threshold. If this charging threshold is set to a voltage close to 100% with respect to the battery capacity, it is possible to start using the mobile phone in a state almost always full after charging is completed. Therefore, in consideration of the usable time of the mobile phone, it is necessary to set the charging threshold as close as possible to the voltage at the completion of charging.

  For example, providing a switch on the desktop holder and allowing the user to switch between holding / storage and charging is an effective method for reducing the number of times of charging. However, with this method, the convenience of the desktop holder is impaired, and it is a fact that all the general users who use the mobile phone are forced to perform such an operation in consideration of the characteristics of the lithium ion battery by the charge cycle. It is difficult.

  Japanese Patent Laying-Open No. 2002-75463 (Patent Document 1) discloses a technique for charging only when the battery voltage is equal to or lower than a charging threshold. Japanese Patent Laying-Open No. 2005-182626 (Patent Document 2) discloses a technique for controlling charging based on driving history information that records whether an apparatus is driven by an AC power source or a battery. Yes.

JP 2002-75463 A JP 2005-182626 A

  As described above, there is a case where the action of the user connecting the portable terminal device to the AC adapter is not necessarily intended for charging. For example, when the AC adapter is a desktop holder type that has a function and shape that can hold and store the terminal in addition to the charging function, the user connects to the AC adapter for the purpose of holding and storing the portable terminal device after each use. In such a case, if charging is performed under a certain condition regardless of the user's intention, the usage method in which the battery is frequently used and connected causes a result that the life of the secondary battery such as a lithium ion battery is shortened.

  Moreover, if the charging threshold is lowered so that charging is performed only when the remaining battery level decreases, the number of times of charging can be reduced uniformly. However, it is inconvenient for a user who has a situation where it is desired to make one usable time as long as possible, such as a long outing period. That is, for users who want to always use the full battery capacity when removed from the desktop holder, if the battery is not charged despite being connected to the AC adapter, the usable time is shortened and the convenience is reduced. . Therefore, there has been a need for a means and method for extending the life of a secondary battery such as a lithium ion battery without impairing the convenience of the user or the feeling of use of the desktop holder.

  The objective of this invention is providing the charge control method of the portable terminal device which solves the conventional subject mentioned above, and the charge control system of a portable terminal device.

  The present invention relates to a charging control method for a portable communication terminal that charges a battery when a battery voltage is smaller than a charging start voltage when an AC adapter is connected to the portable terminal device incorporating the battery, In addition, the number of connections with the AC adapter within the unit time and the average battery voltage at the time of connection are determined, and the charging start voltage is changed according to the result, and the battery voltage at the time of connection with the AC adapter is determined. Even when the charging start voltage is larger than the changed charging start voltage, the AC adapter connection history is referred to, and charging is started when a predetermined condition is satisfied.

  Further, in the charging control method for a portable terminal device according to the present invention, when the number of AC adapter connections within the unit time exceeds a set value and the average battery voltage exceeds a set value, otherwise The charging start voltage may be set to a lower value than in the case of.

  In the portable terminal device charging control method of the present invention, the elapsed time of connection of the AC adapter is measured, and when the elapsed time of connection exceeds a set value, it is determined that the predetermined condition is satisfied. Also good.

  In the portable terminal device charging control method of the present invention, the number of AC adapter connections is counted separately from the number of AC adapter connections within the unit time, and the predetermined condition is satisfied when the number exceeds a set value. You may make it determine with satisfy | filling.

  In the charging control method for a portable terminal device according to the present invention, the separately counted number of AC adapter connections may be cleared at the start of charging.

  Also, in the charging control method for a portable terminal device of the present invention, when the time when the AC adapter is connected is determined from past statistics as to whether it is in a time zone where the AC adapter connection frequency is high, and is a time zone where the frequency is low In addition, it may be determined that the predetermined condition is satisfied.

  In the charging control method for a mobile terminal device according to the present invention, the mobile terminal device may be a mobile phone.

  The present invention relates to a charging control method for a portable communication terminal that charges a battery when the battery voltage is smaller than a charging start voltage when an AC adapter is connected to the portable terminal device incorporating the battery. In addition, the counting means for counting the number of connections with the AC adapter within the unit time, the changing means for determining the number of connections and the average battery voltage at the time of connection, and changing the charging start voltage based on the result And, when connecting to the AC adapter, even if the battery voltage is greater than the changed charging start voltage, the control means for referring to the AC adapter connection history and starting charging when a predetermined condition is satisfied, It is provided with.

  Further, in the charging control method for a portable terminal device according to the present invention, the changing means has a case where the number of AC adapter connections within the unit time exceeds a set value and the average battery voltage exceeds a set value. Alternatively, the charging start voltage may be set to a lower value than in other cases.

  The charging control method for the portable terminal device according to the present invention further includes a time measuring unit that measures an elapsed time of connection of the AC adapter, and the control unit is configured to perform the predetermined operation when the elapsed time of connection exceeds a set value. It may be determined that the above condition is satisfied.

  Further, in the charging control method of the portable terminal device of the present invention, it further comprises another counting means for counting the number of times of AC adapter connection in addition to the number of times of connection of the AC adapter within the unit time. When the number of means exceeds a set value, it may be determined that the predetermined condition is satisfied.

  In the charging control method for the portable terminal device of the present invention, the other counting means may be cleared at the start of charging.

  In the charging control method for the portable terminal device according to the present invention, the control means determines whether the time when the AC adapter is connected is in a time zone where the AC adapter is frequently connected from past statistics, and the frequency is low. In the time zone, it may be determined that the predetermined condition is satisfied.

  In the charging control method for a mobile terminal device according to the present invention, the mobile terminal device may be a mobile phone.

  The present invention has an effect of effectively reducing the charge cycle and extending the battery life without impairing the usability and convenience of the user's portable terminal device. The reason is that the number of AC adapter connections per unit time and the average voltage of the battery at the time of connection are determined, and the charging start voltage is changed according to the result. This is because charging is started when the connection history satisfies the predetermined condition.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings. It is a functional block diagram which shows the structure of 1st Embodiment of this invention.

  As shown in the figure, the first embodiment of the present invention includes an AC adapter 1 and a mobile terminal device 2. The desktop holder type AC adapter 1 that can hold the portable terminal device 2 is an external power source that can be attached to and detached from the portable terminal device 2, and supplies power to the portable terminal device 2 during charging. The mobile terminal device 2 includes a CPU 3, a memory 4, a charge control circuit 5, an AD converter 6, and a battery 7.

  A CPU (Central Processing Unit) 3 controls the overall operation of the mobile terminal device 2 and reads various setting values and writes battery voltage measurement results to the memory 4. The memory 4 stores various set values and battery voltage measurement results. Examples of setting values related to the present invention include a charging threshold “high”, a charging threshold “low”, a number threshold C1 of the number of times of AC adapter connection within a unit time, a voltage threshold AV of an average battery voltage when the AC adapter is connected, For example, the timer threshold T of the AC adapter connection elapsed time can be used. Details of these set values will be described later.

  The charge control circuit 5 performs a charge control operation for the battery 7 in accordance with an instruction from the CPU 3. The charging control circuit 5 also counts the number of connections of the AC adapter 1 within a unit time (hereinafter referred to as “first number counter”) and the elapsed time of connection of the AC adapter 1. And a time counter. The AD converter 6 notifies the CPU 3 of the result of A / D (analog / digital) conversion of the voltage of the battery 7. The battery 7 is a secondary battery such as a lithium ion battery, for example, and supplies power to each part of the mobile terminal device 2. Note that description of functional blocks that are not directly related to the present invention (for example, communication functions when the present invention is applied to a mobile phone) is omitted.

  Next, the operation of the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 2 is a flowchart for explaining the charging threshold value determining operation in the first embodiment of the present invention. FIG. 3 is a flowchart for explaining the operation when the AC adapter is connected in the first embodiment of the present invention. FIG. 4 shows the relationship between the battery voltage and the charging determination range in the first embodiment of the present invention, where (a) shows the relationship when the charging threshold is “high”, and (b) shows the case when the charging threshold is “low”. It is a figure which shows each relationship.

  First, referring to FIG. 2, an operation for determining a charging threshold (charging start voltage that is a reference for starting charging) necessary for switching determination of the charging control operation when connected to an AC adapter 1 described later will be described.

  The portable terminal device 2 starts this process every time the unit time elapses (for example, once a day) regardless of the attachment / detachment with the AC adapter 1 (step S201). The CPU 3 compares the number of AC adapter connections within the unit time counted by the first number counter in the charge control circuit 5 with the number threshold C1 preset and stored in the memory 4 (step S202). . If the number of AC adapter connections is less than the number threshold C1 (No in step S202), it is determined that the battery 7 is used without affecting the cycle life, and the charging threshold is set to “high” ( Step S205). In step S202, when the AC adapter connection count is greater than the number threshold C1 (Yes in step S202), the process proceeds to step S203, and then the average battery voltage is compared.

  In step S <b> 203, the average battery voltage calculated by the CPU 3 when the AC adapter is connected is compared with the voltage threshold value AV of the average battery voltage that is preset and stored in the memory 4. When the average battery voltage is smaller than the voltage threshold AV (No in step S203), it is determined that the battery is used in a state where the charging frequency is high but the battery capacity is low and should be charged, and the charging threshold is set to “high”. (Step S205). If the average battery voltage is higher than the voltage threshold AV (Yes in step S203), it is determined that the AC adapter 1 is frequently detached even though it is not in a state to be charged, and the charging threshold is set to “low”. Setting is made (step S204).

  Here, the difference between “high” and “low” of the charging threshold will be described with reference to FIGS. Referring to FIG. 4A in which the vertical axis indicates the battery voltage level, the charging threshold “high” indicates a case where the battery 7 is set to a voltage slightly lower than the charging completion voltage at which the battery 7 is fully charged. Even if the charging is completed, if the battery voltage falls below the charging threshold “high” due to the consumption current of the mobile terminal device 2 or the self-discharge of the battery 7, the recharging starts from the charging completion state, so the charging starts and stops. For example, a setting with a hysteresis width of about 0.2 V is performed so as not to be frequently repeated. On the other hand, referring to FIG. 4B in which the vertical axis indicates the battery voltage level, the charging threshold “low” indicates a case where the voltage is set to be somewhat lower than the charging completion voltage. In addition, a voltage equivalent to the charging threshold value “high” in FIG.

  In these drawings, “remaining amount 4” indicates a voltage range in which charging is not performed even when the AC adapter 1 is connected. The “remaining amount 3” is a voltage that is charged only when the AC adapter connection history satisfies a predetermined condition described later (for example, when the AC adapter connection elapsed time is larger than the set timer threshold T1). Indicates the range. Further, “remaining amount 2” indicates a voltage range in which charging is performed. Furthermore, “remaining amount 1” indicates a voltage range in which charging is performed but the mobile terminal device 2 cannot operate. Assume that the remaining amount of battery is “4 remaining” and “1 remaining” is small.

  Next, the operation of the mobile terminal device 2 when the AC adapter 1 is connected will be described with reference to FIG. When the AC adapter 1 is connected to the portable terminal device 2 (step S301), the charging control circuit 5 counts up the number of connections (first counter) per unit time of the AC adapter 1 (step S302). The number of connections of the first counter is used in the determination operation described with reference to FIG. Next, it is determined whether the charging threshold already set in the determination operation of FIG. 2 is “high” or “low” (step S303).

  In step S303, when the charging threshold is “low” (Yes in step S303), in the charging control circuit 5, the time counter that counts the time that the AC adapter 1 is connected starts from zero (step S306). . Next, the AD converter 6 measures the voltage of the battery 7 and notifies the CPU 3 of it. Further, the value is stored in the memory 4 (step S307). Next, the measured battery voltage is compared with the charging threshold 2 shown in FIG. 4B (step S308).

  In step S308, when the battery voltage is larger than the charging threshold 2 (No in step S308), it is determined that the “remaining amount is 4”, charging is not performed, and the process proceeds to monitoring of the battery voltage again. On the other hand, when the battery voltage is smaller than the charging threshold 2 in Step S308 (Yes in Step S308), a comparison with the charging threshold “low” is performed (Step S309).

  In step S309, when the measured battery voltage is smaller than the charging threshold “low” (Yes in step S309), it is determined that the remaining amount is “2” and charging is started (step S311). On the other hand, in step S309, when the battery voltage is larger than the charging threshold “low” (No in step S309), it is determined that the “remaining amount is 3”, and the process proceeds to step S310.

  In subsequent step S <b> 310, a comparison is made between a connection elapsed time after the AC adapter 1 is connected and a timer threshold T that is preset and stored in the memory 4. In step S310, when the connection elapsed time has passed the timer threshold T or more (Yes in step S310), charging is started (step S311). On the other hand, if the connection elapsed time is equal to or shorter than the timer set value in step S310 (No in step S310), charging is not started and the process proceeds to battery voltage monitoring again.

  On the other hand, when the charging threshold is “high” in Step S303 (No in Step S303), the battery voltage is measured and stored in the memory 4 (Step S304). When the battery voltage is smaller than the charging threshold “high” (Yes in step S305), charging is started (step S311).

  As described above, in the present invention, the number of AC adapter connections per unit time is counted using the charge control circuit 5, the battery voltage is measured using the AD converter 6, and the resulting count number and average battery voltage are measured. Is compared with each threshold value set in advance. Further, according to the present invention, by the comparison, the CPU 3 determines the charging necessity degree when the AC adapter 1 is connected, and sets the battery voltage setting value (charging threshold value) to start charging according to the level of charging necessity. Switching.

  When there is a remaining battery level that does not require charging when the mobile terminal device 2 is normally used, and the AC adapter 1 is frequently connected despite the low necessity for charging, the CPU 3 Lowers the charging threshold that determines the battery voltage at which charging starts. When the charging threshold is lowered, charging is not started when the capacity is not reduced so much with respect to full charging.

  Further, in this state, if the time set by the timer threshold value T has elapsed, the user frequently repeats attachment / detachment to / from the AC adapter 1 (that is, immediately after using the mobile terminal device 2 for a while) It is determined that the act of repeating the operation of returning to the desktop holder is completed, and charging is started. Thus, unnecessary charging due to frequent attachment / detachment of the AC adapter 1 is not performed by starting charging based on the history that the time interval of the preset timer threshold T has elapsed since the AC adapter connection start. So that it is controlled. Thereby, the frequency | count of charging can be reduced, ensuring the one time use time of the portable terminal device 2 as usual.

  Even in the usage method in which the AC adapter is frequently connected, charging is started as usual without waiting for the elapse of a predetermined time in the state of being used until the remaining battery level is sufficiently lowered, and the mobile terminal device 2 Can be used. If it is determined that the user's usage tendency does not connect to the AC adapter 1 too frequently, the battery life is not deteriorated due to the charge cycle at an early stage, and charging is started as usual. That is, when the battery capacity is greatly reduced or when the AC adapter is not frequently attached and detached (the charging threshold is “high”), the conventional charging operation is performed.

By these operations, charging is performed only when the necessity for charging is high, so that it is possible to reduce the charging cycle of the battery without impairing the usability of the user's portable terminal device. That is, since the number of times of charging can be reduced according to the usage tendency of each user while sufficiently suppressing the influence on the usable time of the mobile terminal device 2, an increase in the charging cycle due to unnecessary and unintended charging can be achieved. By suppressing, the battery life can be extended.
(Description of Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 5 is a flowchart for explaining the operation when the AC adapter is connected in the second embodiment of the present invention. In the second embodiment of the present invention, the configuration is basically the same as that of the first embodiment, but the differences are described because some functions are different. In the second embodiment, a second number counter is provided instead of the time counter (counting the elapsed time of connection of the AC adapter 1) in the charging control circuit 5. The second number counter has a function of counting the number of times the AC adapter 1 is connected, and is a counter different from the first counter described above. Further, the memory 4 stores a frequency threshold C2 instead of the timer threshold T.

  In the operation of the second embodiment shown in FIG. 5, when the AC adapter 1 is connected to the mobile terminal device 2 (step S501), the first counter is counted up (step S502). Next, it is determined whether the charging threshold is “high” or “low” (step S503). The operation when the charging threshold is set to “high” (No in step S503) is the same as that in the first embodiment. That is, the battery voltage is measured and stored in the memory 4 (step S504). If the measured battery voltage is smaller than the charging threshold “high” (Yes in step S505), charging is started (step S512).

  On the other hand, when the charging threshold is set to “low” in step S503 (Yes in step S503), the second number counter (number of times the AC adapter 1 is connected) in the charging control circuit 5 is incremented ( Step S506). Here, the count number of the second number counter is referred to as “number of connections 2”. Next, in step S507, the battery voltage is measured and stored in the memory 4 (step S507).

  Next, in step S508, when the measured battery voltage is smaller than the charging threshold 2 (FIG. 4B) (Yes in step S508), a comparison with the charging threshold “low” is performed in step S509. When the measured voltage is larger than the charging threshold “low” (No in step S509), the above-mentioned connection count 2 (second counter) is compared with the count threshold C2 stored in the memory 4 in advance ( Step S510). If the connection number 2 is smaller than the number threshold C2, the charging is not started and the process proceeds to the battery voltage measurement again (No in step S510).

  If the connection count 2 is larger than the count threshold C2 (Yes in step S510), the connection count 2 of the second counter is cleared (step S511), and charging is started (step S511). That is, even when the charging threshold is “low” and “remaining amount 3”, charging is started when the AC adapter connection history satisfies a predetermined condition (the number of connections 2 is greater than the number threshold C2). In the case of Yes in step S509, since “remaining amount 2”, charging is started. Further, in the case of No in step S508, charging is not started because “remaining amount 4”.

In this embodiment, even if the attachment / detachment to / from the AC adapter 1 is frequently performed by the above operation, charging is not started every time, but is charged once when the number of connections exceeding the number threshold C2 is made. Is done. Thereby, the number of times of charging the battery 7 can be effectively reduced.
(Description of the third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 6 is a flowchart for explaining the operation when the AC adapter is connected in the third embodiment of the present invention. In the third embodiment of the present invention, the configuration is basically the same as that of the first embodiment, but some of the functions are different, and differences will be described. In the third embodiment, instead of the time counter (counting the elapsed time of connection of the AC adapter 1) in the charging control circuit 5, the time function has a clock function and the current time is less frequent when the AC adapter 1 is detached. It has a function to calculate whether or not from the statistics until then.

  In the operation of the third embodiment shown in FIG. 6, when the AC adapter 1 is connected to the mobile terminal device 2 (step S601), the first counter is counted up (step S602). Next, it is determined whether the charging threshold is “high” or “low” (step S603). The operation when the charging threshold is set to “high” (No in step S603) is the same as in the first embodiment. That is, the battery voltage is measured and stored in the memory 4 (step S604). If the measured battery voltage is smaller than the charging threshold “high” (Yes in step S605), charging is started (step S610).

  On the other hand, if the charging threshold is set to “low” in step S603 (Yes in step S603), the battery voltage is measured and stored in the memory 4 (step S606). Next, in step 607, the measured battery voltage and the charging threshold 2 are compared. If the measured battery voltage is smaller than the charging threshold 2 (Yes in step S607), the charging is compared with the charging threshold “low” in step S608. If the measured battery voltage is larger than the charging threshold “low” (No in step S608), it is determined from the statistics so far whether the current time is in a time zone in which the frequency of being detached from the AC adapter 1 is low. (Step S609).

  In step S609, if it is a time zone with a high frequency (No in step S609), it is determined that the mobile terminal device 2 is detached from the AC adapter 1 again and is likely to be used, and charging is not performed. Move on to voltage measurement. In step S609, if it is within a less frequent time zone (Yes in step S609), it is determined that the possibility that the portable terminal device 2 is detached from the AC adapter 1 and used again is low, and charging is started ( Step S610). That is, even when the charging threshold is “low” and the “remaining amount is 3”, charging is started when the AC adapter connection history satisfies a predetermined condition (a time zone with a low connection frequency). In the case of Yes in step S608, charging is started because “remaining amount 2”. Further, in the case of No in step S607, the battery is not charged because it is “remaining amount 4”.

  In the present embodiment, even if the AC adapter 1 is frequently detached and attached by the above operation, charging is not started every time, but is charged only during a time period with a low frequency of attachment / detachment. It can be effectively reduced.

  In each of the above embodiments, the voltage of the battery 7 is measured by the AD converter 6. However, as another means for judging the level of the battery voltage with respect to the threshold value, a plurality of voltage detectors having different detection voltages are used. Even if it is used, the same effect can be obtained.

  In each of the above embodiments, the first count counter, the second count counter, the time counter, the clock function, and whether the current time is a time zone in which the AC adapter 1 is not frequently attached or detached are based on the statistics so far. Although it has been described that the calculation function is provided in the charge control circuit 5, the CPU 3 may realize all or a part of these functions.

  In addition, this invention is not limited only to the above-mentioned embodiment, It can implement in various deformation | transformation in the range which does not deviate from the summary of this invention.

It is a functional block diagram which shows the structure of 1st Embodiment of this invention. It is a flowchart explaining the charge threshold value determination operation | movement in 1st Embodiment of this invention. It is a flowchart explaining the operation | movement at the time of AC adapter connection in 1st Embodiment of this invention. In the first embodiment of the present invention, the relationship between the battery voltage and the charging determination range is shown, (a) shows the relationship when the charging threshold is “high”, and (b) shows the relationship when the charging threshold is “low”. FIG. It is a flowchart explaining the operation | movement at the time of AC adapter connection in 2nd Embodiment of this invention. It is a flowchart explaining the operation | movement at the time of AC adapter connection in 3rd Embodiment of this invention. It is a flowchart explaining operation | movement of a related background art.

Explanation of symbols

1 AC adapter 2 Mobile terminal device 3 CPU
4 Memory 5 Charge Control Circuit 6 AD Converter 7 Battery

Claims (14)

When an AC adapter is connected to a mobile terminal device containing a battery, the battery control method charges the battery when the battery voltage is lower than the charging start voltage,
For each predetermined unit time, determine the number of connections with the AC adapter within the unit time and the average battery voltage at the time of connection, and change the charging start voltage according to the result,
Even when the battery voltage is larger than the changed charging start voltage when connected to the AC adapter, the charging is started when a predetermined condition is satisfied with reference to the AC adapter connection history,
The charge control method of the portable terminal device characterized by the above-mentioned. When the number of AC adapter connections within the unit time exceeds a set value and the average battery voltage exceeds the set value, the charge start voltage is changed to a lower value than in other cases. The charge control method of the portable terminal device according to claim 1. The connection elapsed time of the AC adapter is measured, and when the connection elapsed time exceeds a set value, it is determined that the predetermined condition is satisfied. Charge control method for a portable terminal device. The number of AC adapter connections is counted separately from the number of AC adapter connections within the unit time, and when the number exceeds a set value, it is determined that the predetermined condition is satisfied. The charge control method of the portable terminal device as described in any one of these. 5. The charging control method for a portable terminal device according to claim 4, wherein the separately counted number of AC adapter connections is cleared at the start of charging. Whether the time when the AC adapter is connected is in a time zone where the AC adapter connection frequency is high is determined from past statistics, and if it is a time zone where the frequency is low, it is determined that the predetermined condition is satisfied. The charging control method for a portable terminal device according to any one of claims 1 to 2. 7. The method for controlling charging of a mobile terminal device according to claim 1, wherein the mobile terminal device is a mobile phone. When the AC adapter is connected to a portable terminal device containing a battery, the charging control method of the portable communication terminal charges the battery when the battery voltage is smaller than the charging start voltage,
Counting means for counting the number of connections with the AC adapter within the unit time for each predetermined unit time;
The changing means for determining the number of times of connection and the average battery voltage at the time of connection, and changing the charging start voltage according to the result,
Control means for starting charging when a predetermined condition is satisfied with reference to the AC adapter connection history even when the battery voltage is greater than the changed charging start voltage when connected to the AC adapter;
A charging control method for a portable terminal device, comprising: When the number of AC adapter connections within the unit time exceeds a set value and the average battery voltage exceeds a set value, the changing means sets the charge start voltage more than other cases. The charging control method for a portable terminal device according to claim 8, wherein the charging control method is changed to a low value. The time measuring means for measuring the connection elapsed time of the AC adapter is further provided, and the control means determines that the predetermined condition is satisfied when the connection elapsed time exceeds a set value. The charging control method for a mobile terminal device according to any one of 8 to 9. In addition to the number of AC adapter connections within the unit time, the system further comprises another counting means for counting the number of AC adapter connections, and the control means is configured to output the predetermined number of times when the number of times of the other counting means exceeds a set value. The charge control method for a mobile terminal device according to claim 8, wherein it is determined that the above condition is satisfied. 12. The charging control method for a mobile terminal device according to claim 11, wherein the other counting means is cleared at the start of charging. The control means determines whether the time when the AC adapter is connected is in a time zone where the AC adapter connection frequency is high from past statistics, and if the time is in a low time zone, the predetermined condition is satisfied 10. The charging control method for a mobile terminal device according to claim 8, wherein the charging control method is determined. The charging control system for a mobile terminal device according to any one of claims 8 to 13, wherein the mobile terminal device is a mobile phone.

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