JPH04240953A - Slave set in cordless telephone set - Google Patents

Abstract

PURPOSE:To reduce a discharge quantity of a charging battery by allowing a reception circuit to be in the operating state at all times when the supply of a commercial power supply via a charger is interrupted due to any cause and implementing power supply to the reception circuit section till the charging battery is completely discharged. CONSTITUTION:A switch section 4 controlling the operation of a power supply circuit of a radio equipment section 10 is provided between a power switch 3 of a slave set and the radio equipment section 10 comprising transmission reception circuits 8, 9. Then the switch section 4 interrupts power supply to the radio equipment section after lapse of a prescribed time after the charging battery cannot be charged during standby charging due to any cause thereby stopping the operation of the radio equipment section.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handset in a cordless telephone that is connected to a public telephone line or the like and includes a base, a handset, and a charging stand for the handset.

0002

[Prior Art] In a conventional cordless telephone, if the handset placed on the charging stand falls down for some reason, or if the commercial power input to the handset is cut off due to a power outage, poor contact of the charging terminal, etc., charging The voltage at the charging terminal of the handset that comes into contact with the stand becomes zero potential. At this time, if the handset does not have a quick call function, there is no change in the operating state and the same state as before continues. However, the power supply to the internal circuit of the slave device is switched from the voltage supplied from the commercial power source via the AC adapter and the charging stand to the voltage of the rechargeable battery built in the slave device.

[0003] Also, if the handset has a quick call function, when the power supply is cut off, it will be judged as off-hook, and
Establishes a wireless connection with the base unit for telephone connection. At this time, the power supply to the internal circuit of the handset switches from the voltage of the commercial power supply to the voltage of the rechargeable battery, as described above, after which a wireless connection is established, and from that point on, it waits for dial input (wait for key input).
Then, when the specified time for waiting for dial input has elapsed, a switch is activated to cut off the power supply to the transmitting circuit section in response to a signal from the control section, and the transmitting operation of the transmitting circuit section is stopped.

That is, power is supplied to the transmitting circuit section of the slave unit from the time when the input of commercial power to the slave unit is cut off for some reason until the specified time period for waiting for dial input has elapsed; Not done.

[0005] The receiver circuit section of the handset is always in operation (including intermittent reception operation at short intervals), and power is supplied to the receiver circuit section until the rechargeable battery is completely discharged. .

[0006]

[Problem to be Solved by the Invention] A handset in a cordless telephone should be in a state where it can be used whenever it is desired to be used, and for this reason it is desirable that the rechargeable battery is always in a fully charged state. Even though a person thinks that the handset has been left on the charging stand for a long time and is fully charged, it is actually completely discharged and cannot receive or make calls. There is a way to prevent this.

[0007]

[Means for Solving the Problems] In a cordless telephone handset, a switch section for controlling the power supply circuit operation of the radio section is provided between a power switch and a radio section consisting of a transmitting circuit section and a receiving circuit section. The present invention is characterized in that the radio unit automatically stops operating after a certain period of time has elapsed since the rechargeable battery could no longer be charged due to some reason during standby charging.

[0008]

[Function] According to the handset in the cordless telephone of the present invention, when the handset is placed on the charging stand while charging, the commercial power input is cut off due to some reason and switches to the rechargeable battery, and from the time of wireless connection the handset waits for dial input. (Waiting for key input) time ends, and then, after a certain period of time has elapsed, the operation of the radio unit is stopped to reduce the amount of discharge of the rechargeable battery.

[0009]

[Embodiment] The handset in the cordless telephone of the present invention will be explained with reference to FIGS. 1 and 2. In FIG. 1, when the handset is placed on a charging stand, the voltage of the commercial power source is transferred to the charging terminal of the handset. 1 to the power supply circuit system related to transmission and reception control.

That is, the charging terminal 1 is connected to a rechargeable battery 2 via a diode D1, and is also connected to a power switch 3. The other end of the power switch 3 is connected to an automatic timer switch section 4, and the switch section 4 turns on and off the power supply voltage to the transmitting circuit section 8 and the receiving circuit section 9 in response to a control signal from the control section 7. The transmitting circuit section 8 and the receiving circuit section 9 constitute a radio section 10, which is connected to an antenna 11.

On the other hand, the charging terminal 1 is connected to a voltage detecting section 5 for detecting an input power supply voltage via a diode D2. The control section 7 is connected to the voltage detection section 5, and operates the control section 7 based on the detection output signal to derive a control signal. Further, a mode switch 6 for selecting a power saving mode is connected to the control section 7.

The operational state of the handset in the cordless telephone of the present invention will be explained with reference to the operational diagram shown on the time axis in FIG.

[0013] If the commercial power input to the handset placed on the charging stand is cut off for some reason, the charging terminal 1
As shown in FIG. 2, the voltage a becomes zero at time T1. At this time, if the handset does not have a quick call function, there will be no change in its operating state and it will continue to be in the same state as before, but the power supply to the handset's internal circuit will be from the commercial power source to the rechargeable battery 2 built into the handset. Switch.

Next, if the slave unit has a quick call function, when the power supply is cut off at time T1, it determines that it is off-hook and enters into a wireless connection with the base unit for telephone connection. At this time, the power supply to the slave device internal circuit is switched from the commercial power source to the rechargeable battery 2 in the same manner as described above. When the wireless connection ends at time T2 after time t1, the system waits for dial input (key input) for a specified time t2, and after this time t2, the power supply to the transmitting circuit section 8 stops at time T3.
The switch section 7 is operated and cut off by the signal from the transmission circuit section 8, and the power supply voltage b of the transmitting circuit section 8 becomes non-potential, so that the voltage C also becomes non-potential, and the transmitting operation of the transmitting circuit section 8 is stopped.

In the receiving circuit section 9, the power supply to the receiving circuit section 9 is cut off by the operation of the switch section 4 at time T4, which is t4 hours after waiting for reception operation from the time T3, and the power supply to the receiving circuit section 9 is interrupted. The voltage d becomes non-potential and the reception operation is stopped.

If no new operation is performed between the time T3 and the time t3, the switch unit 4 is operated by the signal from the control unit 7 for the time t5 from the time T5 to the time T6, and the transmitting circuit is activated. 8 and the receiving circuit section 9, operate each circuit section 8, 9, and send an alarm signal to the parent device to the effect that an abnormality has occurred in the charging relationship on the child device side. The slave unit itself also issues an alarm. The alarm can be repeated several times at intervals of time t3 if necessary.

[0017] Thereafter, the slave unit continues to be in a stopped state. or
It is also possible for the handset to perform intermittent transmission and reception at extremely long stop time intervals.

[0018]

As described above, according to the present invention, when a cordless handset is in standby charging mode on a charging stand, if charging becomes impossible for some reason and this state continues for a long time, the wireless device section By stopping the operation of the rechargeable battery, the discharge amount of the rechargeable battery can be reduced, and power can be saved.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram of a power supply system related to transmission and reception control of a handset in a cordless telephone according to the present invention.

FIG. 2 is an operation diagram showing the operation (voltage) state of each circuit section in FIG. 1 on a time axis.

[Explanation of symbols]

1 Charging terminal of the handset 2 Rechargeable battery 3 Power switch 4 Automatic timer switch section 5 Voltage detection section 6 Mode switch 7 Control section 8 Transmission circuit section 9 Receiving circuit section 10 Radio equipment section 11 Antenna

Claims (1)

[Claims] Claim 1: A power switch, a switch section for controlling the power supply circuit operation of the radio section is provided between a radio section consisting of a transmitting circuit section and a receiving circuit section; A handset in a cordless telephone, characterized in that the operation of a radio section is automatically stopped after a certain period of time has passed since the battery can no longer be charged.