JPH04200042A - cordless telephone device - Google Patents

Abstract

PURPOSE:To attain talking even at power failure or even when a charging battery voltage of a slave set is decreased by providing the charging battery used also for a slave set, a charging circuit, a power failure detection circuit and a backup circuit to supply power from the charging battery of a master set. CONSTITUTION:A master set 10 is provided with a charging battery 22 also used for a slave set 30, the master set 10 charges the charging battery 22 and power is supplied from the charging battery 22 on power failure. That is, the master set 10 uses a charging circuit 18 to charge a similar charging battery 22 to that of the slave set 30, then each circuit of the master set 10 is backed up by a backup circuit 23 with an output of a power failure detection circuit 24. Even the charging battery 38 of the slave set 30 is not used due to its voltage drop, the charging battery 38 is replaced with the charging battery 22 of the master set 10, then the slave set is immediately operated. Thus, talking is attained on power failure or even when the charging battery of the slave set drops in voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cordless telephone device consisting of a base unit and a slave unit.

Prior Art FIG. 2 shows the configuration of a conventional cordless telephone device. In FIG. 2, 10 is a base unit of the cordless telephone, 11 is a line connection terminal, 12 is a telephone circuit, 13 is a radio circuit, 14 is an antenna, 15 is a control circuit, 16 is a memory, 17 is a power supply circuit, 18 is a charging circuit, 19 is an AC adapter, 20 is a dry battery, and 21 is a charging terminal.

On the other hand, 30 is a handset of the cordless telephone device, 31 is a receiver, 32 is a microphone, 33 is an operation key, 34 is a radio circuit, 35 is a control circuit, 36 is an antenna, 37 is a power supply circuit, 38 is a rechargeable battery, 39 is a charging terminal.

Next, the operation of the above conventional example will be explained. In FIG. 2, ACI○OV is rectified into DC by the AC adapter 19 of the base unit 1o, and is input to the power supply circuit 17. The output of the power supply circuit] 7 is input as a power source to the circuit 18 for driving each circuit, holding the memory 16, and charging the circuit 18, and charges the rechargeable battery 38 via the charging terminal 21 and the charging terminal 39 of the handset 30.

The memory 16 stores telephone numbers, response messages, etc., and is read and written under the control of the control circuit 15. The dry battery 20 is used as a backup for the memory 16 when there is no output from the AC adapter 19.

In the handset 30, a rechargeable battery 38 is connected by a power supply circuit 37.
The output of is used to power each circuit.

Incoming calls from the line are processed through the line connection terminal 11, the telephone circuit 12, and the radio circuit 13 under the control of the control circuit 15 of the base unit 1o.
, from the antenna 14 through the antenna 36 of the handset 30,
Under the control of the control circuit 35 of the handset 30, the wireless circuit 34,
This is done through the receiver 31 and microphone 32.

To make a call from the handset 30 or to control the base unit 10, the control circuit 35 controls the wireless circuit 34 through the output of the operation key 33, and a signal is sent to the base unit 10 via the antenna 36. is received by the antenna 14 of the base unit 10 and sent to the line via the radio circuit 13 and under the control of the control circuit 15 from the telephone circuit 12 through the line connection terminal 11.

As shown in point 2, even in the above-mentioned conventional cordless telephone device, A.
, C7 adapter 19 and dry cell battery 20, it is possible to make calls and maintain memory.

Problems to be Solved by the Invention However, in the conventional cordless telephone device described above, the dry battery 20 is used for backing up the memory 16, so if there is no output from the AC adapter 19 due to a power outage, etc., the connection between the base unit 10 and the slave unit 30 will be interrupted. There is a problem in that a cordless telephone device that does not have a microphone and a receiver on the base unit 10 side cannot make a phone call. Further, in the handset 30 as well, there is a problem in that if the voltage of the rechargeable battery 38 decreases due to long-term calls or forgetting to charge the battery, calls cannot be made.

The present invention is intended to solve these conventional problems, and aims to provide an excellent cordless telephone device that is capable of making calls even during a power outage or when the rechargeable battery of a handset is low.

Means for Solving the Problems In order to achieve the above object, the present invention provides a rechargeable battery that can also be used in the slave unit and a charging circuit that can charge the same on the base unit side, and also includes a power failure detection circuit and a rechargeable battery. A backup circuit is provided to supply power from the main unit.

Therefore, according to the present invention, by charging a rechargeable battery similar to that of the slave unit on the base unit side using a charging circuit, in the event of a power outage, each circuit of the base unit is backed up by the backup circuit using the output of the power failure detection circuit. In addition, even if the rechargeable battery of the slave unit becomes unusable due to voltage drop, the slave unit can be used immediately by replacing the battery with the rechargeable battery of the base unit. Calls can be made. Furthermore, on the base unit side, there is an effect that a disposable dry cell battery for storing memory is not required.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention, and elements similar to those of the conventional example shown in FIG. 2, which open to the left, are given the same reference numerals. That is, in FIG. 1, 10 is a base unit of the cordless telephone, 11 is a line connection terminal, 12 is a telephone circuit, 13 is a radio circuit, 14 is an antenna, 15 is a control circuit, 16 is a memory, and 17 is a power supply circuit. , 18 is a charging circuit, 19 is an AC adapter, 21 is a charging terminal, 22 is a rechargeable battery, 23 is a backup circuit, and 24 is a power failure detection circuit.

On the other hand, the handset 30 is the same as that shown in FIG. 2, with 31 being a receiver, 32 being a microphone, 33 being an operation key, 34 being a wireless circuit, 35 being a control circuit, 36 being an antenna, 37 being a power supply circuit, and 38 being a charger. The battery 39 is a charging terminal. Master unit 10
The rechargeable battery 22 and the rechargeable battery 38 of the handset 30 are non-wireless and can be replaced with each other.

Next, the operation of the above embodiment will be explained. In the above embodiment, the AC adapter 19 of the main unit 10 connects the ACIO
V is rectified to DC and input to the power supply circuit 1. The output of the power supply circuit 17 is supplied as a power source to each circuit, and is also supplied to the charging circuit 1, which charges the rechargeable battery 22 through the second charging circuit 18, and also connects the charging terminal 21 and the charging terminal 39 of the handset 30. The rechargeable battery 38 of the handset 30 is charged through this process.

When the output of the AC adapter 19 decreases due to a power outage, etc., the power outage detection circuit 24 detects this through the power supply circuit 17, and the control circuit 15 switches the power supply to each circuit of the main unit 10 from the rechargeable battery 2.
The backup circuit 23 is controlled to start from step 2.

In addition, if the power outage returns during backup by the rechargeable battery 22, the power supply voltage by the AC adapter 19 will be changed to the rechargeable battery 22.
Power supply circuit 1 so as to output higher than the power supply voltage by 2.
7 is set, this state is detected by the power failure detection circuit 24.
is detected and output to the control circuit 15. Control circuit 15
considers this to be a power outage recovery, and supplies power to each circuit to the power supply circuit 17 using the AC adapter 19, and connects the rechargeable battery 2.
Control is performed to charge the battery 2 and cancel the backup.

In the handset 30, a rechargeable battery 38 is connected by a power supply circuit 37.
The output of is used to power each circuit.

As described above, according to the above embodiment, even if power is not supplied to the base unit 10 due to a power outage or the like, the power outage detection circuit 24 detects this and power is supplied by the rechargeable battery 22, making it possible to make a call. It has this effect.

In addition, the rechargeable battery 22 of the base unit 10 and the rechargeable battery 3 of the slave unit 30 are
8 have common specifications, even if the rechargeable battery 38 of the handset 30 becomes unusable due to a drop in voltage due to a long call or forgetting to charge it, the rechargeable battery 22 of the base unit 10 is always charged. By replacing the subunit 3o with the subunit 3o, not only the subunit 30 becomes usable, but also the rechargeable battery 38 of the subunit 3o can be charged on the main unit 10 side during that time.

Effects of the Invention As is clear from the above embodiments, the present invention provides a base unit with a rechargeable battery that can also be used for slave units, charges this rechargeable battery on the base unit side, and uses the rechargeable battery to provide power during a power outage. Since the power is supplied, it is possible to communicate between the base unit and the slave unit even in the event of a power outage, which has the effect of making it possible to communicate.

Furthermore, even if the rechargeable battery of the handset becomes unusable due to voltage drop, by replacing the battery with a rechargeable battery that has been charged on the master side, the handset can be used immediately without waiting for charging.

Furthermore, there is an effect that a disposable dry battery for storing memory is not required on the base unit side.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a cordless telephone device showing an embodiment of the present invention, and FIG. 2 is a schematic block diagram showing an example of a conventional cordless telephone device. 10...Base unit, 11...Line connection terminal, 12...Telephone circuit, 13...Radio circuit, 14...Antenna,
15... Control circuit, 16... Memory, 17... Power supply circuit, 18... Charging circuit, 19... AC adapter, 21... Charging terminal, 22... Rechargeable battery, 23...・
- Backup circuit, 24...Power failure detection circuit. 30... Handset, 31... Receiver, 32... Microphone, 33... Operation key, 34... Wireless circuit, 35...
・Control circuit, 36... Antenna, 37... Power supply circuit, 3
8... Rechargeable battery, 39... Charging terminal. Name of agent: Patent attorney Haru Akira Koebi and 2 others10
Master unit father - slave unit L ,,j-,,---
Yun-118 11-meter line connection) 4--Antebu 21- Photoelectric 4-5- 1- + Mobile

Claims (2)

[Claims] (1) A base unit of a cordless telephone device includes a power supply circuit, a rechargeable battery, a power failure detection circuit that detects the output voltage of the power supply circuit, a charging circuit that charges the rechargeable battery, and a power supply using the output of the rechargeable battery. a backup circuit for supplying
and a control circuit that controls power supply from the backup circuit based on the output of the power failure detection circuit. (2) The cordless telephone device according to claim (1), wherein the rechargeable battery of the base unit and the rechargeable battery of the slave unit have common specifications.