JP2008154434A - Charger for portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To previously avoid interference in charging of a terminal-side battery due to current reflux into a charger-side battery when charging the terminal-side battery at high speed. <P>SOLUTION: When a battery remaining amount of the charger-side battery 9 is less than a first prescribed value, a charger 1 stops a supply of an output current from the charger-side battery 9 to the terminal-side battery 24 so as to stop charging of the terminal-side battery 24. The output current from the charger-side battery 9 is not supplied to the terminal-side battery 24 in the state that the remaining amount of the charger-side battery 9 is empty. Consequently, it is possible to previously avoid interference in charging of the terminal-side battery 24 due to current reflux into the charger-side battery 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a charger for a mobile terminal that inputs a USB output current from an external device and supplies the USB output current to a terminal-side battery built in the mobile terminal to charge the terminal-side battery.

  In recent years, as a portable terminal charger for charging a terminal-side battery provided in a portable terminal, USB bus power is used as an operating power source, and a USB output current is supplied to the terminal-side battery to determine the USB bus power current value. Something is charging the battery. By the way, in the portable terminal charger using the conventional USB bus power as the operation power supply, the bus power output current exceeding the USB bus power consumption current standard (100 [mA] or 500 [mA]) is supplied to the terminal-side battery. The terminal-side battery cannot be charged at a faster charging speed than when charging the terminal-side battery with the bus power output current.

Therefore, a charger-side battery is provided in the charger for the portable terminal, the USB output current is supplied to the charger-side battery to charge the charger-side battery, and the USB output current and the charger are charged when charging the terminal-side battery. The structure which supplies the sum with the output current from a side battery to a terminal side battery, and charges a terminal side battery at high speed is considered. On the other hand, in Patent Document 1 below, there is a portable terminal charger that can charge various terminal-side batteries corresponding to various portable terminals by exchanging the built-in battery according to the model to be charged. It is disclosed.
Utility Model Registration No. 3081987

  By the way, when the sum of the USB output current and the output current from the battery on the charger side is supplied to the terminal side battery to charge the terminal side battery at a high speed, When trying to supply the output current from the battery to the terminal side battery, there is a problem that the current flows backward to the battery on the charger side and hinders charging of the terminal side battery.

  The present invention has been made in view of the above-described circumstances, and its purpose is that when charging the terminal side battery at a high speed, current flows backward to the charger side battery, thereby hindering charging of the terminal side battery. It is an object of the present invention to provide a portable terminal charger capable of avoiding the problem.

  According to the first aspect of the present invention, the charger side battery charging / discharging unit supplies the USB output current to the charger side battery as a charger charging current to charge the charger side battery, and the terminal side battery charging unit Supplies at least the output current from the charger side battery to the terminal side battery as the terminal charging current to charge the terminal side battery. Therefore, the sum of the USB output current and the output current from the charger side battery is determined as the terminal side battery. To charge the terminal side battery at high speed. In addition, when the terminal side battery is charged at high speed, the charge control unit determines that the battery side of the charger side battery detected by the charger side battery remaining amount detection unit is less than the first predetermined value. Since the supply of the output current from the battery to the terminal-side battery is stopped and the charging of the terminal-side battery is stopped, the output current from the charger-side battery is changed to the terminal-side battery while the remaining amount of the charger-side battery is empty. Therefore, it is possible to prevent the charging of the battery on the terminal side due to the current flowing back to the battery on the charger side.

  According to the second aspect of the present invention, the charging control means determines the USB output current when the remaining battery level of the charger-side battery detected by the charger-side battery remaining capacity detection means is equal to or greater than the second predetermined value. Since the charging to the charger side battery is stopped by stopping the charging to the charger side battery, an excessive supply of the charger charging current to the charger side battery can be avoided in advance. Loss of quality can be avoided in advance.

  According to the third aspect of the present invention, the terminal-side battery remaining amount detecting means detects the battery remaining amount of the terminal-side battery, and the charging control means is based on the detection result of the terminal-side battery remaining amount detecting means. Since the charging control of the charger side battery is performed, the charging control of the charger side battery can be performed in consideration of the remaining battery level of the terminal side battery.

  According to the invention described in claim 4, the charge control means detects the remaining battery level of the terminal-side battery detected by the terminal-side battery remaining quantity detection means and is less than a third predetermined value and detects the remaining battery level on the charger side. If the remaining battery level of the charger side battery detected by the means is equal to or greater than the first predetermined value, the terminal side battery is charged by supplying the terminal side battery with the output current from the charger side battery as the terminal charging current. The terminal battery can be charged at high speed.

  According to the fifth aspect of the present invention, the charge control means detects that the battery charge of the terminal side battery detected by the terminal side battery charge detection means is greater than or equal to a fourth predetermined value from the charger side battery. Since the amount of output current supplied to the terminal-side battery is reduced, it is possible to avoid excessive supply of terminal charging current to the terminal-side battery, and to avoid impairing the quality of the terminal-side battery. Can do.

  According to the sixth aspect of the present invention, the charging control means is configured such that when the remaining battery level of the terminal-side battery detected by the terminal-side battery remaining capacity detecting means is equal to or greater than a fourth predetermined value, the charger-side battery Since the supply of the output current to the side battery charging means is stopped and the terminal side battery is charged only by the USB output current, it is possible to avoid excessive supply of the terminal charge current to the terminal side battery in this case as well. It is possible to prevent the quality of the terminal side battery from being impaired.

  According to the invention described in claim 7, the charge control means detects the remaining battery level of the terminal-side battery detected by the terminal-side battery charge level detecting means is equal to or greater than a fourth predetermined value and detects the remaining battery level of the charger. When the remaining battery level of the charger side battery detected by the means is less than the second predetermined value, the USB output current is supplied to the charger side battery charge / discharge means as the charger charging current to charge the charger side battery. Therefore, the battery on the charger side can be charged, and the next time the terminal side battery is charged, the sum of the USB output current and the output current from the battery on the charger side is quickly supplied to the terminal side battery. The terminal side battery can be quickly charged at high speed.

  According to the invention described in claim 8, the charging completion time predicting means is the battery side of the terminal side battery detected by the terminal side battery residual quantity detecting means and the charger side detected by the charger side battery residual quantity detecting means. Since the time until the charging of the terminal-side battery is completed is predicted as the charging completion time based on the remaining battery level of the battery, the charging completion time display means displays the charging completion time predicted by the charging completion time prediction means. The user can be informed of the time until the terminal side battery is fully charged.

  According to the ninth aspect of the present invention, the drivable time predicting means includes the battery remaining amount of the terminal side battery detected by the terminal side battery remaining amount detecting means and the charger side detected by the charger side battery remaining amount detecting means. Based on the remaining battery level of the battery, the time that the portable terminal can be driven is predicted as the drivable time, and the drivable time display means displays the drivable time predicted by the drivable time prediction means. The user can be informed of the driveable time.

  Hereinafter, as an embodiment of the present invention, for example, a case where the present invention is applied to a portable information terminal charger (hereinafter referred to as a charger) for charging a portable information terminal comprising a barcode handy terminal will be described with reference to the drawings. explain. FIG. 1 is a functional block diagram showing the configuration of the charger.

  The charger 1 is configured so that a portable information terminal 21 (portable terminal in the present invention) can be attached and detached, and the current of the current output terminal 2 and the portable information terminal 21 when the portable information terminal 21 is normally attached. The input terminal 22 is electrically connected, and the ground terminal 3 and the ground terminal 23 of the portable information terminal 21 are electrically connected. The charger 1 has a USB interface, and includes a USB output current input terminal 4 for inputting a USB output current and a USB ground terminal 5, and is connected to an external device (not shown) via a USB cable (not shown). In this state, the USB output current output from the external device is input to the USB output current input terminal 4.

  The charger 1 includes, as functional blocks, a CPU 6 (charging control means, charger-side battery remaining amount detecting means, terminal-side battery remaining amount detecting means, charging completion time predicting means, drivable time predicting means), terminal Side battery charging circuit 7 (terminal side battery charging means in the present invention), charger side battery charging / discharging circuit 8 (charger side battery charging / discharging means in the present invention), charger side battery 9, charge / discharge switch 10 and A display 11 (charging completion time display means, drivable time display means in the present invention) is provided. The CPU 6 includes a ROM that stores a control program, a RAM that functions as a work area, and the like. The CPU 6 executes the control program and executes a terminal-side battery charging circuit 7, a charger-side battery charging / discharging circuit 8, a charging / discharging switch 10, and a display 11. To control.

  When the portable information terminal 21 is normally attached to the charger 1, the terminal-side battery charging circuit 7 determines that the USB output current is the terminal side of the portable information terminal 21 when the charge / discharge switch 10 is off. The battery 24 is supplied as a terminal charging current. Further, the terminal side battery charging circuit 7 is connected to the charger side that discharges and outputs the USB output current and the charger side battery 9 when the charge / discharge switch 10 is ON and the charger side battery 9 has a remaining amount. When the sum of the output current from the battery 9 is supplied to the terminal-side battery 24 of the portable information terminal 21 as the terminal charging current, while the charge / discharge switch 10 is on but there is no remaining charge in the charger-side battery 9 In this case, only the USB output current is supplied as the terminal charging current to the terminal side battery 24 of the portable information terminal 21.

  When the charging / discharging switch 10 is ON and the remaining amount of the charger-side battery 9 is not present, the charger-side battery charging / discharging circuit 8 outputs a USB according to the charging state of the terminal-side battery 24 of the portable information terminal 21. The current is supplied to the charger side battery 9 as a charger charging current.

  The CPU 6 measures the remaining voltage of the terminal-side battery 24 by measuring the voltage across the terminal-side battery 24, for example, and measures the remaining voltage of the charger-side battery 9 by measuring the voltage across the charger-side battery 9, for example. To do.

  In the configuration described above, the CPU 6 inputs the USB output current to the USB output current input terminal 4 and the battery of the charger side battery 9 in a state where the portable information terminal 21 is normally attached to the charger 1. If the remaining amount is less than a preset first predetermined value, the supply of the output current from the charger side battery 9 to the terminal side battery 24 is stopped, and the charging of the terminal side battery 24 is stopped. Here, the first predetermined value may cause a trouble in charging the terminal-side battery 24 by causing a current to flow backward to the charger-side battery 9 when the remaining battery level of the charger-side battery 9 is empty. It is a certain value.

  In addition, when the CPU 6 inputs the USB output current to the USB output current input terminal 4, the charger-side battery 9 does not matter whether the portable information terminal 21 is normally attached to the charger 1. When the remaining battery level is equal to or greater than a second predetermined value set in advance, the supply of the USB output current to the charger side battery 9 is stopped, and the charging of the charger side battery 9 is stopped. The second predetermined value here is a value that may damage the quality of the charger-side battery 9 if the USB output current is supplied to the charger-side battery 9 thereafter and the charger charging current becomes excessive. It is.

  In addition, the CPU 6 inputs the USB output current to the USB output current input terminal 4 and the portable information terminal 21 is normally attached to the charger 1, as shown in FIG. The following operations are performed by controlling on / off of the charge / discharge switch 10 according to the remaining amount of the battery 9 and the remaining amount of the terminal-side battery 24. The CPU 6 has a remaining amount of the terminal-side battery 24 that is less than a preset third predetermined value (empty state) and a remaining amount of the charger-side battery 9 is equal to or greater than a preset first predetermined value ( When the remaining amount is present), the charging / discharging switch 10 is turned on to discharge the charger-side battery 9, and the sum of the USB output current and the output current from the charger-side battery 9 is supplied to the terminal-side battery 24. Thus, the terminal-side battery 24 is charged with a current value higher than the USB bus power current value (see “state A”).

  Further, the CPU 6 performs charge / discharge when the remaining amount of the terminal-side battery 24 is less than a third predetermined value and the remaining amount of the charger-side battery 9 is less than a first predetermined value (there is no remaining amount). The switch 10 is turned off, the USB output current is supplied to the terminal-side battery 24, and the terminal-side battery 24 is charged with the USB bus power current value (see “State B”).

  Next, when the remaining amount of the terminal-side battery 24 becomes equal to or higher than a preset fourth predetermined value (almost fully charged) by charging the terminal-side battery 24 in this way, the CPU 6 charges at that time. When the remaining amount of the battery 9 is equal to or greater than the second predetermined value, the charge / discharge switch 10 is turned off, and the USB output current corresponding to the remaining amount of the terminal battery 24 is supplied to the terminal battery 24 to The terminal-side battery 24 is continuously charged with a current value lower than the power current value (see “State C”).

  Further, when the remaining amount of the battery 9 on the charger side is less than the second predetermined value at that time, the CPU 6 turns on the charge / discharge switch 10 and sends the USB output current corresponding to the remaining amount of the terminal side battery 24 to the terminal. The terminal battery 24 is continuously charged at a current value lower than the USB bus power current value by being supplied to the side battery 24, and a part of the USB output current is supplied to the charger side battery 9 to be charged to the charger side battery. 9 is also charged (see “state D”).

  Then, the CPU 6 continues to charge the terminal-side battery 24 even after the battery is nearly fully charged in this way, and when the remaining amount of the terminal-side battery 24 becomes fully charged, the terminal-side battery of the USB output current The charging to the terminal side battery 24 is stopped by stopping the supply to the terminal 24, and if the remaining amount of the charger side battery 9 is greater than or equal to the second predetermined value at that time, the charger side battery is not charged. (See “State E”).

  Further, when the remaining amount of the battery 9 on the charger side is less than the second predetermined value, the CPU 6 turns on the charge / discharge switch 10 and supplies the USB output current to the battery 9 on the charger side. The side battery 9 is charged (see “State F”).

  FIG. 3 shows the third predetermined value and the fourth predetermined value with respect to the remaining amount of the terminal-side battery 24, and the first predetermined value and the second predetermined value with respect to the remaining amount of the charger-side battery 9. Show.

  FIG. 4 shows the state transitions of “state A” to “state F” described above. That is, when the charging of the terminal-side battery 24 of the portable information terminal 21 is started from “state A”, the charger-side battery 9 is discharged in the process in which the remaining amount of the terminal-side battery 24 becomes empty to near full charging. If the amount is small, the state transitions from “state A” to “state C”. Subsequently, if the remaining amount of the terminal-side battery 24 is fully charged, the amount of discharge of the charger-side battery 9 is small, “state C”. To “state E”.

  On the other hand, if the amount of discharge of the charger-side battery 9 is large in the process where the remaining amount of the terminal-side battery 24 is nearly empty to full charge, the state transitions from “state A” to “state D”, If the amount of charge of the charger-side battery 9 is large in the process of the remaining amount 24 being fully charged, the process transitions from “state D” to “state E” while the remaining amount of the terminal-side battery 24 is fully charged If the charging amount of the battery 9 on the charger side is small, the transition from the “state D” to the “state F” is made. If the battery 9 on the charger side is charged, the state changes from “state D” to “state C”.

  Further, when charging of the terminal-side battery 24 of the portable information terminal 21 is started from “state B”, the state transitions from “state B” to “state D”, and the remaining amount of the terminal-side battery 24 is fully charged. If the charge amount of the battery 9 on the charger side is large in the following process, the state transitions from “state D” to “state E”. On the other hand, If the amount of charge is small, the transition from “state D” to “state F” will occur.

  In the above-described configuration, when the operation switch (not shown) is operated, the CPU 6 determines the remaining amount of the terminal-side battery 24 based on the remaining amount of the charger-side battery 9 and the remaining amount of the terminal-side battery 24. The time until full charge is predicted as the charge completion time and displayed on the display 11, or the time during which the portable information terminal 21 can be driven in a state where the charger 1 is mounted on the portable information terminal 21. It is predicted as the driveable time and displayed on the display 11.

  As described above, according to the present embodiment, when the remaining battery level of the charger-side battery 9 is less than the first predetermined value in the charger 1, the terminal-side battery of the output current from the charger-side battery 9 is used. 24, the charging of the terminal-side battery 24 is stopped and the charging of the terminal-side battery 24 is stopped, so that the output current from the charger-side battery 9 is supplied to the terminal-side battery 24 when the remaining amount of the charger-side battery 9 is empty. Therefore, it is possible to prevent the charging of the terminal side battery 24 from being disturbed by the current flowing back to the battery 9 on the charger side.

  Further, when the remaining battery level of the charger side battery 9 is equal to or greater than the second predetermined value, the supply of the USB output current to the charger side battery 9 is stopped and the charging of the charger side battery 9 is stopped. Since it comprised, the supply of the excessive charger charging current to the charger side battery 9 can be avoided beforehand.

The present invention is not limited to the above-described embodiment, and can be modified or expanded as follows.
The structure by which the charger side battery is provided with two or more in parallel may be sufficient.
The mobile terminal may be a terminal having a telephone function such as a mobile phone.

Functional block diagram showing an embodiment of the present invention The figure which shows the mode in each state The figure which shows the 3rd predetermined value and 4th predetermined value with respect to the residual amount of the terminal side battery 24, and the 1st predetermined value and 2nd predetermined value with respect to the residual amount of the charger side battery 9 State transition diagram

Explanation of symbols

  In the drawings, 1 is a portable information terminal charger (portable terminal charger), 6 is a CPU (charge control means, charger-side battery remaining amount detecting means, terminal-side battery remaining amount detecting means, charging completion time predicting means. , 7 is a terminal side battery charging circuit (terminal side battery charging means), 8 is a charger side battery charging / discharging circuit (charger side battery charging / discharging means), 9 is a charger side battery, 11 Is a display (charge completion time display means, drivable time display means), 21 is a portable information terminal (mobile terminal), and 24 is a terminal side battery.

Claims (9)

A battery charger for a mobile terminal that inputs a USB output current from an external device and supplies it to a terminal-side battery built in the mobile terminal to charge the terminal-side battery,
A battery on the charger side,
Charger-side battery charging / discharging means for charging the charger-side battery by supplying the USB output current to the charger-side battery as a charger charging current;
Charger-side battery remaining amount detecting means for detecting the remaining amount of battery of the charger-side battery;
Terminal-side battery charging means for charging the terminal-side battery by supplying at least an output current from the charger-side battery as a terminal charging current to the terminal-side battery;
Charge control means for performing charge control of the charger side battery based on a detection result of the charger side battery remaining amount detection means,
The charging control means, when the battery remaining amount of the charger side battery detected by the charger side battery remaining amount detecting means is less than a first predetermined value, of the output current from the charger side battery A portable terminal charger, wherein supply to the terminal-side battery is stopped to stop charging the terminal-side battery. The mobile terminal charger according to claim 1,
When the remaining battery level of the charger-side battery detected by the charger-side battery remaining amount detecting unit is equal to or greater than a second predetermined value, the charge control unit is configured to supply a USB output current to the charger-side battery. A portable terminal charger, wherein supply is stopped to stop charging the battery on the charger side. In the portable terminal charger according to claim 1 or 2,
Comprising a terminal-side battery remaining amount detecting means for detecting a battery remaining amount of the terminal-side battery;
The charger for a portable terminal, wherein the charging control unit performs charging control of the battery on the charger side based on a detection result of the terminal-side battery remaining amount detection unit. In the portable terminal charger according to claim 3,
The charging control means includes the charger in which a battery remaining amount of the terminal-side battery detected by the terminal-side battery remaining amount detecting means is less than a third predetermined value and detected by the charger-side battery remaining amount detecting means. When the battery remaining amount of the side battery is equal to or greater than a first predetermined value, the terminal side battery is charged by supplying an output current from the charger side battery to the terminal side battery as a terminal charging current. A battery charger for portable terminals. In the portable terminal charger according to claim 3 or 4,
The charge control means, when the battery remaining amount of the terminal side battery detected by the terminal side battery remaining amount detection means is a fourth predetermined value or more, the terminal of the output current from the charger side battery Charger for portable terminals, characterized in that the supply amount to the side battery is reduced. In the portable terminal charger according to claim 3 or 4,
The charge control means, when the battery remaining amount of the terminal side battery detected by the terminal side battery remaining amount detection means is a fourth predetermined value or more, the terminal of the output current from the charger side battery A battery charger for a portable terminal, wherein supply to the side battery is stopped and the terminal side battery is charged only with a USB output current. The mobile terminal charger according to any one of claims 4 to 6,
The charging control means includes the charger in which a battery remaining amount of the terminal-side battery detected by the terminal-side battery remaining amount detecting means is a fourth predetermined value or more and the charger-side battery remaining amount detecting means detects When the battery remaining amount of the side battery is less than a second predetermined value, the charger side battery is charged by supplying the USB output current to the charger side battery as a charger charging current. Mobile terminal charger. The portable terminal charger according to any one of claims 3 to 7,
The terminal-side battery is charged based on the remaining battery level of the terminal-side battery detected by the terminal-side battery level detection unit and the remaining battery level of the charger-side battery detected by the charger-side battery level detection unit. Charging completion time prediction means for predicting the time until completion of charging as the charging completion time;
A portable terminal charger comprising: a charge completion time display means for displaying a charge completion time predicted by the charge completion time prediction means. The portable terminal charger according to any one of claims 3 to 7,
The portable terminal can be driven based on the remaining battery level of the terminal-side battery detected by the terminal-side battery level detection unit and the remaining battery level of the charger-side battery detected by the charger-side battery level detection unit. Drivable time predicting means for predicting time as drivable time;
A portable terminal charger comprising: drivable time display means for displaying drivable time predicted by the drivable time prediction means.

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