JPH11313446A - Mobile phone and charger thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a malfunction-free quick charger and a mobile phone which has a good balance of charging and discharging in standby charging. SOLUTION: When a mobile phone body 5 which mounts a battery 3 is put on a quick charger 1, the quick charger starts quick charging and outputs a signal (e.g. 'H') which indicates that the mobile phone body 5 has been quickly-charged on a terminal 2. The signal is transmitted to a terminal 8 of the side of the mobile phone body via battery terminals 4, 6. The mobile phone body 5 receives the signal, and intermittently stops receiving operation to become a continuously receiving condition. When the rapid charging has been completed and trickle charging is started, the quick charger 1 outputs a signal (e.g., 'L') which indicates that the quick charging has been stopped on a terminal 2, and the mobile phone body 5 receives the signal to change from a continuously receiving condition to an intermittently receiving condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone and a battery charger for controlling the standby mode during battery charging.

[0002]

2. Description of the Related Art Generally, in recent mobile phones,
For the purpose of extending the standby time, intermittent reception is performed in which a receiving circuit is turned on / off at fixed time intervals to reduce time average current consumption.

[0003] However, as shown in FIG. 2, when the quick charger 21 performs quick charging of the battery 23 while the portable telephone 22 is in a standby state, the quick charger 21 malfunctions and charging stops. In some cases.

In general, as shown in FIG. 3, charging of a nickel-metal hydride battery or the like is performed by first performing quick charging, and then switching from rapid charging to trickle charging when the battery voltage gradually increases and the voltage starts to decrease. Taken. The quick charger monitors the amount of change (DV) of the battery voltage over time for the charge control, and detects a point at which the amount changes to a certain amount, but as shown in FIG. In the standby charging state performed with the mobile phone 22 attached to the main body, as shown in FIG. 4, due to the battery voltage fluctuation due to the intermittent operation, the battery voltage of the quick charger is not correctly monitored, and the rapid charging is stopped halfway. Resulting in.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides, as a charger, a first battery for supplying a large current to a connected battery during rapid charging and supplying a small current during trickle charging. A terminal, a charge control circuit that detects an increase or decrease in the voltage of the battery and switches from the quick charge to the trickle charge, and a second that outputs a signal indicating that the quick charge or the trickle charge is being performed. Terminals.

[0006] Further, as a portable telephone which charges by being installed in such a charger, the current supplied from the charger to the battery is either a large current (rapid charge state) or a small current (trickle charge state). And a power supply circuit that performs a continuous reception operation or an intermittent reception operation by supplying a current from the battery, and a state in which the signal is input and a large current or a small current is supplied, respectively. And a control circuit for setting the power supply circuit to a continuous reception operation or an intermittent reception operation.

[0007]

FIG. 1 is a block diagram of a portable telephone and a charger for explaining an embodiment of the present invention. This will be described below with reference to the drawings.

The nickel-metal hydride battery quick charger 1 is provided with a terminal 2 for outputting a signal indicating a quick charge state from a charge control circuit, in addition to a terminal for charging the battery 3. The battery 3 has an input terminal for charging from the quick charger 1 and an output terminal for supplying the charged power to the mobile phone body 5, a terminal 4 in contact with the terminal 2, and an input to the terminal 4. A terminal 6 for outputting a signal indicating a quick charge state to the mobile phone main body 5 is provided.

The portable telephone body 5 is provided with a terminal 8 connected to the terminal 6 in addition to a terminal for inputting electric power supplied from the battery 3 to the power supply circuit 7. The signal indicating the quick charge state input through the terminal 8 is
It is supplied to a control circuit 9 connected to a power supply circuit 7 in the mobile phone body 5.

[0010] The connection between these terminals is realized in a state where the battery 3 is mounted on the portable telephone main body 5 and set in the quick charger 1 as shown in FIG. 2.

The operation will be described below. When the mobile phone main body 5 with the battery 3 mounted is placed on the quick charger 1, the quick charger starts quick charging (eg, charging current of 500 mA), and a signal (for example, "H") indicating that the terminal 2 is being rapidly charged. )
Is output. The signal is transmitted to the terminal 8 on the mobile phone main body via the terminals 4 and 6 of the battery. The mobile phone main body 5 receives the signal, stops the intermittent reception operation, and sets a continuous reception state.

When quick charging is completed and trickle charging (for example, charging current is 10 mA) is started, the quick charger 1 outputs a signal (for example, "L") indicating that the quick charging is stopped to the terminal 2 and the portable telephone body 5 Receives the signal and shifts from the continuous reception state to the intermittent reception.

As described above, according to the embodiment of the present invention,
When the mobile phone main body 5 receives the signal indicating the quick charging state of the quick charger 1, the intermittent / continuous receiving state can be switched, and erroneous detection of the battery voltage of the quick charger can be prevented.

In addition, during rapid charging in which charging is performed with a large current, a continuous standby receiving state with high consumption is provided, and during trickle charging in which charging is performed with a small current, an intermittent standby receiving state with low consumption is provided. In standby charging while consuming power, it is possible to maintain a good charge / discharge balance.

In this embodiment, the control of the main body of the mobile phone when the nickel-metal hydride battery quick charger 1 is used has been described. However, the control of the main body of the mobile phone in the constant voltage charging of the lithium ion battery can be applied.

[0016]

As described above, according to the present invention, it is possible to provide a quick charger free from malfunction and a mobile phone with a good charge / discharge balance in standby charging.

[Brief description of the drawings]

FIG. 1 is a block diagram of a charger and a mobile phone for explaining an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a standby state between a general mobile phone and a charger.

FIG. 3 is a diagram showing a relationship between a charging time and a battery voltage in a general battery.

FIG. 4 is a diagram showing a relationship between time and body current / battery voltage in a standby state of a general mobile phone.

[Explanation of symbols]

 1: Quick charger 2, 4, 6, 8: Terminal 3: Battery 5: Mobile phone body 7: Power supply circuit 9: Control circuit

Claims (2)

[Claims] A first terminal for supplying a large current to the connected battery during a quick charge and supplying a small current during a trickle charge; detecting a rise or fall in a voltage of the battery to detect the rise or fall of the voltage of the battery; A charger comprising: a charge control circuit that switches to trickle charging; and a second terminal that outputs a signal indicating that the charging is being performed during the quick charging or the trickle charging. 2. A terminal to which a signal indicating that a current supplied from a charger to a battery is a large current or a small current is input, and a continuous reception operation or an intermittent reception operation is performed by supplying a current from the battery. A power supply circuit; and a control circuit for setting the power supply circuit to a continuous reception operation or an intermittent reception operation according to a state where the signal is input and a large current or a small current is supplied, respectively. Mobile phone.