JP2580288Y2 - Cordless telephone with power outage backup function for base unit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone which charges a storage battery of a slave unit from a charging circuit of a master unit.
The present invention relates to a cordless telephone having a power failure backup function for a base unit.

[0002]

2. Description of the Related Art Conventionally, a power failure backup of a base unit in a cordless telephone is performed by a battery such as a dry battery or a storage battery built in the base unit.

[0003]

However, in the conventional cordless telephone, there is a problem that the battery is used for the power failure backup of the base unit, which leads to an increase in cost and maintenance of the battery.

[0004] The present invention has been made in view of such a point, and by eliminating the backup battery for the base unit, it is possible to reduce the cost and provide a power failure backup function for the base unit that does not require maintenance of the battery. It is an object of the present invention to provide a cordless telephone having the same.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, a cordless telephone having a power failure backup function of a base unit according to the present invention is a cordless telephone that charges a storage battery of a child unit from a charging circuit of the base unit. A voltage detection circuit that detects a power outage, a relay that operates based on a command from the voltage detection circuit, and a storage battery of the child device that is based on the operation of the relay from the charging circuit side of the parent device to the power circuit side of the parent device. This is characterized in that a master switch is provided with a relay switch for switching to the main unit.

[0006]

When the voltage detection circuit detects a power failure of the master unit, it issues a command to operate the relay. By the operation of this relay, the connection between the charging circuit of the master unit and the storage battery of the slave unit is cut off,
Conversely, the power supply circuit of the master unit and the storage battery of the slave unit are connected. Therefore, the electric power from the storage battery of the slave unit is supplied to the power supply circuit of the master unit, and the power supply circuit of the master unit supplies the power to a necessary part of the master unit. In a cordless telephone, since the slave unit always has a built-in storage battery, the storage battery of the slave unit is used as a power source of the master unit during a power failure. As described above, by eliminating the need for the power failure battery of the master unit, the cost is reduced, and the maintenance of the battery becomes unnecessary.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an outline of a cordless telephone according to an embodiment of the present invention. In the figure, an AC / DC adapter (not shown) or the like is connected to the connection terminals t1 and t2 of the base unit 1, and power is supplied. A charging circuit 11 charges a storage battery (described later) of the slave unit. Reference numeral 12 denotes a power supply circuit, which supplies electric power to necessary parts of the base unit 1. Reference numeral 13 denotes a voltage detection circuit that issues a command to operate the relay when a power failure of the master unit 1 is detected. D is a diode, and SW is a relay switch.
t3 and t4 are charging terminals of the base unit 1. The charging terminals of the slave unit 2 are t5 and t6. Reference numeral 21 denotes a power supply circuit,
Supply power to the required locations. 22 is a storage battery.

The operation will be described with the slave unit 2 placed on the charging stand of the master unit 1, that is, with the charging terminals t3 and t5 and t4 and t6 connected. First, the connection terminal t
When power is supplied from the power supply circuit 1 and t2, the power is supplied to the power supply circuit 12 via the diode D. The electric power from the power supply circuit 12 charges the storage battery 22 of the slave unit 2 via the charging circuit 11 and the SW. Next, connection terminals t1, t2
When the power supply from the power supply is interrupted, an operation command is issued to the relay when the voltage detection circuit 13 detects a power failure of the master unit 1. By switching the switch SW, the electric power from the storage battery 22 is supplied to the power supply circuit 12 via the switch SW. In this case, the diode D works as a backflow prevention. in this way,
When the power failure is detected by the base unit 1, charging of the base unit 1 to the slave unit 2 is stopped, and power is supplied from the slave unit 2 to the base unit 1. The base unit 1 uses this power to ensure the operation except for the following cordless function even in the event of a power failure. 1. 1. Hands-free transmission; 2. Hands-free incoming call response; Shortened,
3. One-touch dial, Answering machine function.

FIG. 2 is a flowchart for explaining the power failure backup function of the parent device in the cordless telephone of the present invention. In the figure, the numeral following the symbol S indicates a step number. [S1] Has the parent machine failed? If a power failure occurs, the process proceeds to S2; otherwise, the process proceeds to S5. [S2] The voltage detection circuit detects a power failure of the master unit. [S3] The relay operates based on a command from the voltage detection circuit. [S4] By the operation of the relay, the power from the storage battery of the slave unit is supplied to the power supply circuit of the master unit. [S5] The parent device and the child device perform normal operations.

[0010]

[Effect of the Invention] As described above, the cordless telephone having the power failure backup function of the base unit according to the present invention is:
A voltage detection circuit that detects a power failure of the base unit, a relay that operates based on a command from the voltage detection circuit, and a power supply of the base unit from the charging circuit side of the base unit that stores the battery of the slave unit based on the operation of the relay. A relay switch for switching to the circuit side is provided on the master unit, so the storage battery of the slave unit is used and the battery of the master unit is eliminated, thereby reducing the cost of the master unit and regulating the appearance with the backup battery. User maintenance is not required.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of a cordless telephone according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining a power failure backup function of a parent device in the cordless telephone according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 master unit 2 slave unit 11 charging circuit 12 power supply circuit 13 voltage detection circuit 21 power supply circuit 22 storage battery

Claims (1)

(57) [Scope of request for utility model registration] 1. A cordless telephone that charges a storage battery of a slave unit from a charging circuit of a master unit, a voltage detection circuit that detects a power failure of the master unit, a relay that operates based on a command from the voltage detection circuit, A cordless telephone having a power failure backup function for the base unit, wherein the base unit is provided with a relay switch for switching the storage battery of the slave unit from the charging circuit side of the base unit to the power supply circuit side of the base unit based on the operation of the relay .