JPH053504A - Power supply control circuit for radio telephone set - Google Patents

Abstract

PURPOSE:To suppress current consumption at a slave unit by controlling the operation of supplying power to reception circuit. CONSTITUTION:Althrough signals at H and L levels are alternately outputted to a first control signal output terminal 28 provided at a control circuit 15 for prescribed time in a standby state, the output cycle is changed based on signals inputted to an input terminal 26 for voltage detection. For example, in the state of putting the slave unit on a stand, namely, in the state of executing the charging operation of a battery charger 11, the signals at the H level are outputted for one second at every 0.5 second and in the state of not putting the slave unit set on the stand, namely, in the state of not executing the charging operation of the battery charger 11, the signals at the H level are outputted to the first control signal output terminal 28 for one second at every one second. Therefore, since power is intermittently supplied to a reception circuit 19 in the standby state, the consumption of the battery charger can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio telephone composed of a master unit connected to a telephone line and a slave unit which communicates by radio, and more particularly to a power supply control circuit.

[0002]

2. Description of the Related Art Wireless telephones, which are composed of a base unit connected to a telephone line and a handset that communicates wirelessly, are widely used. The handset in such a radio telephone is used while being carried. Therefore, a rechargeable battery is generally used as an operating power source. The cordless handset of the wireless telephone is placed on a stand for the telephone, and when the telephone is used, the handset is detached from the stand so that the telephone can communicate with the caller. The charging operation of the rechargeable battery incorporated in the slave unit is performed when the charging battery is mounted on the mounting table. Therefore, if the calling signal is received without placing the slave unit on the stand, that is, in the standby state, the charging operation of the rechargeable battery is not performed and the capacity of the battery is consumed. Therefore, in the slave unit of such a wireless telephone, it is required to reduce the battery current consumption. Since the slave unit of the wireless telephone needs to receive the signal transmitted from the master unit in the standby state, it is necessary to activate the reception circuit, which consumes the rechargeable battery. As a method of reducing the current consumption by such a receiving circuit, there is a method of intermittently supplying power to the receiving circuit.
There is one disclosed in Japanese Patent No. 8130.

[0003]

According to the technique of intermittently supplying power to the receiving circuit, the current consumption by the receiving circuit can be reduced, but the receiving circuit is operated when the calling signal is transmitted from the master unit. In the inoperative state, it takes time until the sounding operation of the ringing signal is performed, which causes a problem that the calling party is uncomfortable. The present invention intends to provide a power supply control circuit that improves such a point.

[0004]

A power supply control circuit of the present invention is incorporated in a slave unit constituting a wireless telephone, and a rechargeable battery which is charged when the slave unit is mounted on a charging device. And a receiving circuit that receives a signal transmitted from the master unit, and a power supply circuit that controls a power supply operation to the receiving circuit.

[0005]

According to the present invention, whether the power supply operation to the receiving circuit is intermittently performed and the charging operation of the rechargeable battery is performed,
The power supply operation is controlled by detecting whether or not it is.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the power supply control circuit of the present invention. In the figure, reference numeral 1 is a power supply circuit section incorporated in a stand on which a slave unit is mounted, a power supply connection terminal 2 connected to a commercial power supply, a power transformer 3 for stepping down the commercial power supply,
It is composed of a rectifier circuit 4 for rectifying the AC signal stepped down by the power transformer 3 and a capacitor 5 for smoothing the DC signal rectified by the rectifier circuit 4.
Reference numerals 6 and 7 denote first and second charging output terminals for outputting a DC voltage rectified and smoothed by the rectifying circuit 4 and the capacitor 5, and are provided on the stand.

Reference numeral 8 denotes a cordless handset circuit incorporated in a cordless handset of a wireless telephone. When the cordless handset is placed on the stand, the first charging output terminal 6 and the second charging output are provided. A first charging input terminal 9 and a second charging input terminal 10 that are in contact with the terminal 7 are provided. Reference numeral 11 is a rechargeable battery that is incorporated in the slave unit and supplies the operating power of the slave unit circuit 8. When the slave unit is placed on the stand, the charging current is supplied via the resistor 12 and the diode 13. It is configured to be supplied and a charging operation is performed. 14
Is a power switch, and 15 is a control circuit that is activated by the power from the rechargeable battery 11 when the power switch 14 is closed, and has a function of controlling the operation of the slave unit. . Reference numeral 16 is a dial operation button, 17 is a call operation switch that is pressed and closed when a call operation is performed, and 18
Is a call release operation switch that is pressed and closed when ending the call operation, and 19 is a receiving circuit that receives a signal transmitted from the master unit, and an output terminal that outputs a call detection signal when the call signal is received Equipped with 20. Reference numeral 21 denotes a first power supply circuit that supplies the operating power from the rechargeable battery 11 to the receiving circuit 19 based on the control operation of the control circuit 15, and a signal of H (high) level is applied to the control terminal 22. During this time, power is supplied to the receiving circuit 19. Reference numeral 23 is a transmission circuit for transmitting a voice of a speaker who uses the slave unit to the master unit, and 24 is an operating power source from the rechargeable battery 11 and is supplied to the transmission circuit 23 based on a control operation by the control circuit 15. The second power supply circuit is configured to supply power to the transmission circuit 23 when an H level signal is applied to the control terminal 25. Reference numeral 26 is a voltage detection input terminal provided in the control circuit 15, and is connected to the first charging input terminal 9 via a resistor 27. 28 is a first control signal output terminal provided in the control circuit 15, and is connected to the control terminal 22 of the first power supply circuit 21. Reference numeral 29 is a second control signal output terminal provided in the control circuit 15, and is connected to the control terminal 25 of the second power supply circuit 24.

In such a circuit configuration, when in the standby state, the H level signal and the L (low) level signal are alternately output to the first control signal output terminal 28 provided in the control circuit 15 for a predetermined time. However, its output cycle is configured to be changed based on the signal input to the voltage detection input terminal 26. For example, when the slave unit is placed on the stand, that is, when the charging operation of the rechargeable battery 11 is performed, the slave unit outputs an H level signal for 1 second every 0.5 seconds. When it is not placed on the stand, that is, when the charging operation of the rechargeable battery 11 is not performed, an H level signal is output to the first control signal output terminal 28 for 1 second every 1 second. ing.

The power supply control circuit of the present invention is constructed as described above, and its operation will be described below. When the slave unit is placed on the stand, the first charging input terminal 9 and the second charging input terminal 10 are in contact with the first charging output terminal 6 and the second charging output terminal 7 provided on the stand, respectively. become. In such a state, the DC current output from the power supply circuit unit 1 is supplied to the rechargeable battery 11 through the first charging input terminal 9, the resistor 12 and the diode 13, so that the rechargeable battery 11 is charged. It is ready to be done.

When the power switch 14 is closed in such a state, operating power is supplied to the control circuit 15, and the operation of the control circuit 15 puts the slave circuit 8 in a standby state. When in the standby state, the L level signal is output to the second control signal output terminal 29 provided in the control circuit 15. Therefore, the second power supply circuit 2
4 does not supply power to the transmission circuit 23, and the transmission circuit 23 is in the inoperative state. Further, the H-level signal and the L-level signal are alternately output to the first control signal output terminal 28 provided in the control circuit 15, but in such a state, the voltage detection input terminal 26 receives the first signal. 1
Since the voltage from the charging input terminal 9 is applied, that is, the charging operation of the rechargeable battery 11 is being performed,
The H-level signal is output to the first control signal output terminal 28 every 0.5 seconds for 1 second. Therefore, the first
Receive circuit 19 from power supply circuit 21 for 1 second every 0.5 seconds
Since the rechargeable battery 11 supplies power to the receiving circuit 19, the receiving circuit 19 is activated every 0.5 seconds.

When a calling signal corresponding to the calling signal from the telephone line is transmitted from the base unit in the standby state, the receiving circuit 19 performs the receiving operation and the detection signal is output to the output terminal 20. . When such a detection signal is applied to the control circuit 15, an H level signal is output to the first control signal output terminal 28 and a call signal is output from a speaker (not shown) provided in the child device. Sound emission operation is performed. By listening to such a ringing tone, the user can recognize that a call is coming in, and thus perform an operation for a call.

When the user presses and closes the call operation switch 17 to make a call, the second control signal output terminal 2
An H level signal is output to 9 and a signal for performing a connection operation with the telephone line is output. When an H level signal is output to the second control signal output terminal 29, the second
Power is supplied to the transmission circuit 23 through the power supply circuit 24 to bring the transmission circuit 23 into an operating state, so that a signal for performing the closing operation is transmitted to the master unit through the transmission circuit 23. When such a signal is received by the base unit, the closing circuit incorporated in the base unit is put into operation, and the telephone line is closed. After the closing operation of the telephone line is performed in this manner, the receiving operation of the receiving circuit 19 provided in the slave, the transmitting operation of the transmitting circuit 23, and the transmitting / receiving operation of the transmitting / receiving circuit provided in the parent device. Allows the user to talk to the calling party.

By such an operation, the user can talk with the calling party, but when the telephone is hung up, the operation switch 18 for canceling the call may be pressed and closed. When the call release operation switch 18 is pressed and closed in a call state, a signal for releasing the operation of closing the telephone line is output to the master unit through the transmission circuit 23. When such a signal is received by the base unit, the closed circuit incorporated in the base unit becomes inoperative and the closed state with the telephone line is released. When such a closing release operation is performed, the output signal of the second control signal output terminal 29 is inverted from the H level to the L level, the power supply to the transmission circuit 23 is cut off, and the handset receives the next incoming call. It is possible to wait for a wait. And
When the slave unit is placed on the stand, as described above, the H level signal is output to the first control signal output terminal 28 every 0.5 seconds for 1 second, and the standby state described above is configured.

The standby operation and the call operation in the state in which the child device is placed on the stand are performed as described above. Next, in the case where the child device is placed on the desk or the like instead of the stand, the stand-by state is set. explain. In such a state, when the slave unit circuit 8 is put in the standby state, the L level signal is output to the second control signal output terminal 29 and the H level signal and the L level signal are output to the first control signal output terminal 28 as described above. The level signal and the level signal are output alternately. In such a state, since the charging voltage is not applied to the voltage detection input terminal 26, that is, the charging operation of the rechargeable battery 11 is not performed, the first control signal output terminal 28 is set to 1 every 1 second.
An H level signal is output for a second. Therefore,
From the first power supply circuit 21, the receiving circuit 19 for 1 second every 1 second
Since the rechargeable battery 11 supplies power to the receiving circuit 19, the receiving circuit 19 is activated every one second.

As described above, when the rechargeable battery 11 is in the non-charged state, the receiving circuit 19 is set to the operating state every one second, that is, the time in the non-operating state is longer than that in the charging state. The charging battery 1
The consumption of 1 can be suppressed. Since the incoming operation and the like accompanying the arrival of the calling signal are performed as described above, the description thereof will be omitted.

In the above description, the power supply to the receiving circuit 19 is intermittently performed when the slave unit is placed in the standby state with the slave unit placed on the stand. When the charging current capacity to the battery 11 has a margin, power can be continuously supplied to the receiving circuit 19.

[0017]

According to the power supply control circuit of the present invention, when the charging operation of the rechargeable battery is not performed, the power supply operation to the receiving circuit is intermittently performed, so that the consumption of the rechargeable battery can be suppressed. it can. Further, according to the present invention, when the charging operation of the rechargeable battery is being performed, the inactive period of the receiving circuit is shortened or eliminated, so that the time required from the incoming call to the calling operation is shortened. The present invention has an effect that it is possible to do so and does not cause discomfort to the caller.

[Brief description of drawings]

FIG. 1 is an embodiment of a power supply control circuit of the present invention.

[Explanation of reference numerals] 1 power supply circuit unit 6 first charging output terminal 7 second charging output terminal 8 slave device circuit 9 first charging input terminal 10 second charging input terminal 11 rechargeable battery 15 control circuit 19 Reception circuit 21 First power supply circuit 23 Transmission circuit 24 Second power supply circuit

Claims (2)

[Claims] 1. A radiotelephone comprising a base unit connected to a telephone line and a handset unit that communicates by radio,
A rechargeable battery that is installed in the slave unit and that is charged when the slave unit is placed on the charging device, a receiver circuit that receives a signal transmitted from the master device, and a power supply to the receiver circuit. A power supply circuit for controlling the supply operation, in a standby state, when the rechargeable battery is in a non-charged state, intermittently supplies power to the receiving circuit and, when in a charging state, supplies power to the receiving circuit A power supply control circuit for a wireless telephone, characterized in that the supply cycle is shortened. 2. A radiotelephone comprising a base unit connected to a telephone line and a handset unit that communicates by radio,
A rechargeable battery that is installed in the slave unit and that is charged when the slave unit is placed on the charging device, a receiver circuit that receives a signal transmitted from the master device, and a power supply to the receiver circuit. A power supply circuit for controlling the supply operation, and in the standby state, when the rechargeable battery is in a non-charged state, intermittently supplies power to the receiving circuit and supplies power to the receiving circuit in the charging state. A power supply control circuit for a wireless telephone, which is configured to be continuously supplied.