JP2008043038A - Mobile terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device which can switch a charging current value to shorten a charging time. <P>SOLUTION: The mobile terminal device having a secondary battery comprises a charging connection port A and a charging connection port B for charging the secondary battery, a charging circuit for supplying the charging current to the secondary battery, and a charging current value switching circuit for switching the charging current value supplied from the charging circuit in charging from the charging port B. When performing simultaneous charging of a plurality of the secondary batteries as before, an aggregate charger unit is used to perform charging from the charging connection port A, while when performing individual charging, an AC adaptor is used to perform charging from the charging connection port B. At a time of individual charging, the charging current value is switched, enabling charging in a shorter time as compared with the charging time when the charging is performed with the aggregate charger unit. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable terminal that has a secondary battery and is charged from a battery charger.

  Conventionally, mobile terminals have been used when negotiating with customers for external affairs, and they have been charged with rechargeable batteries from midnight to early morning when business is not performed, and at the same time transmit operational data. When the portable terminal is connected to the portable terminal charging socket, charging is started, and at the same time, business data of each portable terminal is transmitted by the communication circuit. Since the mobile terminal has a liquid crystal and printer, it uses a secondary battery with a large battery capacity, and since the charging current per unit is large and multiple units are charged simultaneously, collective charging Considering the electrical capacity of the entire facility where the equipment is installed, a protection circuit is provided to limit the current so that no more than a certain amount of current flows.

The portable terminal has one charging connection port connected to the charging terminal provided in the cradle and is charged only from the collective charger. I couldn't charge where I didn't have a collective charger.
JP 09-223519 A (FIG. 1, paragraph 0011) Japanese Patent Laid-Open No. 08-9561 (FIG. 1, paragraphs 0011 to 0014)

  However, in the conventional mobile terminal, it is necessary to limit the charging current value per unit depending on the charging environment, and there is a case where the secondary battery is discharged during business and needs to be charged immediately. There has been a problem that charging must be performed at a constant charging current in the collective charger.

  The present invention has been made in order to solve the conventional problems. By providing two charging connection ports in the portable terminal, the charging connection port A (first charging connection port) ) From the collective charger and when charging alone, the charging adapter B (second charging port) is charged from the AC adapter, and when charging alone, the charging current value is switched, It is an object of the present invention to provide a portable terminal that can be charged in a shorter time than charging with a collective charger.

  The portable terminal of the present invention is connected to a charging connection port A and a charging connection port B for charging a secondary battery, and a charging connection port A and a charging connection port B, and a charging current is supplied to the secondary battery. A charging circuit for supplying, a charging connection port B, and a charging current value switching circuit for switching a charging current value supplied to the secondary battery when charging from the charging connection port B is connected to the charging connection port B and the charging circuit It has the composition provided with.

With this configuration, when charging from the charging connection port A, the charging current is supplied to the battery from the charging circuit, and when charging from the charging connection port B, the charging current value supplied from the charging circuit is switched by the charging current switching circuit, The battery can be charged with more charging current. In addition, the first charging connection port and the second charging connection port can be formed on the lower surface and the same surface of the portable terminal. As a result, when charging with the collective charger having the charging connection port A, the charging connection port B is blocked by the wall of the collective charger and cannot be connected to prevent accidental charging from the two ports. To do.

  The present invention has an effect that the charging time can be shortened by one charging circuit by switching the charging current value by the charging current switching circuit at the time of charging alone. By using the AC adapter connection port, it is possible to provide a portable terminal device having an effect that charging with a shortened charging time can be performed anywhere as long as there is a commercial AC power supply.

  Hereinafter, a portable terminal according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of a portable terminal according to an embodiment of the present invention. In the portable terminal 20, the charging connection port A1 is provided in a cradle for performing collective charging, and the charging port B2 is used for charging by one device alone. In the charging connection port A1, a spring contact provided on the cradle is received by a contact on the portable terminal side, and current is passed therethrough. FIG. 2 is a diagram showing the configuration of the collective charger shown in the present invention. The sockets 1 to 6 are connected to the charging connection port A shown in FIG. 1 to supply a charging current.

  FIG. 4 shows an appearance of a portable terminal collective charger and a single charger according to the embodiment of the present invention, and FIG. 3 shows a circuit example.

  In FIG. 3, the circuit of the portable terminal according to the embodiment of the present invention includes a resistor 15A to 15E, an FET 16 for switching a charging current value, a charging connection port A12 for charging a plurality of units, and a charging connection for single charging. It has a mouth B11, an IC 13 that supplies a charging current, and a secondary battery 14 that is charged. The operation of the mobile terminal configured as described above will be described with reference to FIG.

  First, the operation of the charging circuit 17 when charging from the charging connection port A12 for charging a plurality of units will be described. The IC 13 that supplies the charging current determines the charging current I based on the voltage of VB determined by the dividing resistors 15B and 15C between the reference voltages VA and GND. If the maximum charging current of the charging current supply IC 13 is ImAx, the charging current I is a value calculated by ImAx · VB / VA. At this time, VB is VA · {15C / (15B + 15C)}, and the charging current I is ImAx · {15C / (15B + 15C)}. As shown in FIG. 4, when performing collective charging, the mobile terminal 20 is inserted into a recess provided in the collective charger 6. The sockets 1 and 2 provided on the bottom of the recess and the charging connection port A are coupled to start charging.

  Next, operations of the charging current value switching circuit 18 and the charging circuit 17 when charging from the charging connection port B11 for single charging will be described. When the power supply is connected to the charging connection port B11, a voltage VC divided by resistors 15D and 15E is generated at the gate of the FET 16. When the FET 16 is turned on by VC, VB becomes VA · [15C / {15A · 15B / (15A + 15B) + 15C}], and the charging current I is ImAx · [15C / {15A · 15B / (15A + 15B ) + 15C}], it is possible to perform rapid charging at an arbitrary charging current value by adjusting the constant of 15A.

  According to such a portable terminal of the present invention, the FET 16 that is turned on when charging from the charging connection port B11 for single charging is provided, and by adjusting the constants of 15A, 15B, and 15C, an arbitrary charging current value Can be charged.

  In the above description, the example in which the switch for switching the charging current value is configured by the FET has been described. However, other switches such as a transistor can be similarly implemented. Further, as shown in FIG. 4, a charging connection port A for connecting to a collective charger for charging a plurality of terminals collectively and a charging connection port B for performing quick charging by connecting individual adapters are provided on the same surface of the lower surface of the apparatus. Thus, during the collective charging, the wall of the charger is obstructed and the adapter cannot be connected to the charging connection port B.

  As described above, the portable terminal according to the present invention can shorten the charging time with one charging circuit by switching the charging current value when charging alone by providing two charging connection ports. By using a single charging connection port as an AC adapter connection port, there is an effect that the charging time can be reduced anywhere as long as there is a commercial AC power supply, and a collective charger having a secondary battery It is useful as a portable terminal or the like charged from

The block diagram of the portable terminal in embodiment of this invention Block diagram of portable terminal FIG. 3 is a circuit diagram for explaining the operation of the mobile terminal according to the embodiment of the present invention. Explanatory drawing which shows the external appearance of the portable terminal of embodiment of this invention

Explanation of symbols

1 Charging connection port A
2 Charging connection B
DESCRIPTION OF SYMBOLS 3 Charging circuit 4 Charging current value switching circuit 5 Secondary battery 6 Collective charger 7 Protection circuit 8 Socket for commercial AC power supply 9 Socket group for portable terminal charging 9A Socket for charging portable terminal 9B Socket for charging portable terminal 9C For charging portable terminal Socket 9D Mobile terminal charging socket 9E Mobile terminal charging socket 9F Mobile terminal charging socket 10 Communication circuit 11 Charging port B
12 Charging connection A
13 Charging current supply IC
14 Secondary battery 15 Resistance group 15A Resistance 15B Resistance 15C Resistance 15D Resistance 15E Resistance 16 FET
17 Charging circuit 18 Charging current value switching circuit 20 Mobile terminal

Claims (2)

A first charging connection port for charging the secondary battery;
A second charging connection port having a different shape from the first charging connection port;
In a portable device having
The first charging connection port and the second charging connection port are connected to a charging circuit for supplying a charging current to a secondary battery, and the first charging connection port and the second charging connection port Mobile terminals that receive different charging currents.   The mobile terminal according to claim 1, wherein the first charging connection port and the second charging connection port are formed on a lower surface and the same surface of the mobile terminal.

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