JPS6320197Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a receiving device that uses a built-in DC power source to receive and reproduce a preset specific broadcasting power source during a power outage.

2. Description of the Related Art When a commercial AC power supply goes out in the event of a disaster such as an earthquake or typhoon, there is an urgent need to obtain information regarding the disaster.

In this case, no matter what broadcast waves the receiver is receiving, if you set it to automatically tune to a specific broadcast wave (for example, a broadcast station such as NHK), you can receive information about the disaster more quickly. It is possible to obtain it.

This invention was made based on the above points of view, and its configuration will be explained below with reference to the drawings.

That is, in the figure, 1 is a plug connected to an outlet of a commercial AC power source, and this plug 1 is connected to a power transformer 3 via a power switch 2. An AC/DC converter circuit 4 is connected to the secondary winding side of the power transformer 3 for rectifying voltage-converted AC power and converting it into DC. The output is
The signal is supplied to a receiving circuit 5 of, for example, a television receiver via the diode _D1 , and the receiving circuit 5 is configured to receive and reproduce broadcast waves.

Reference numeral 6 denotes a detection circuit for detecting the presence or absence of a commercial AC power supply connected between the plug 1 and the power transformer 3, that is, whether or not there is a power outage. This detection circuit 6 is constituted by a combination of, for example, means for converting an input AC power source into DC and transistor switch means that is turned on or off depending on the presence or absence of the DC output converted to DC. Therefore, this detection circuit 6 provides an output 1 to the control circuit 8 when the commercial AC power supply is present, and an output 0 when the commercial AC power supply is no longer present, that is, in the case of a power outage. It will be done.

The control circuit 8 has a built-in relay means 81 that is controlled by the output from the detection circuit 6, and this relay means 81 turns the switch SW into an OFF state when the output from the detection circuit 6 is 1. When the output is 0, the switch SW is held in the on state. In other words, if the commercial AC power supply fails, the switch in the control circuit 8
The SW is turned on, and the DC current from the DC power supply 7 is supplied to the receiving circuit as an operating power source via the switch SW and the diode _D2 . Further, by turning on the switch SW, the positive output of the DC power supply 7 is provided to the receiving circuit 5 as a control signal.

Although not shown, the receiving circuit 5 has built-in means for applying a predetermined tuning voltage to the varactor diode by inputting this control signal. broadcasting). At this time, it is more effective to configure the system so that the sound is reproduced at a predetermined volume no matter where the volume volume of the receiving circuit is located.

In the above configuration, when commercial AC power is supplied, when the power switch 2 is turned on, operating DC current is supplied from the AC/DC conversion circuit 4 to the receiving circuit 5. 5 performs normal reception and reproduction.

However, in the event of a power outage in the commercial AC power supply, a switching signal is provided from the detection circuit 6 to the control circuit 8 regardless of whether the power switch 2 is on or off, and as a result, the receiving circuit 5 receives a control signal. A DC current for operation is applied from the DC power supply 7 via the switch SW in the circuit 8 . Furthermore, a control signal is applied from the control circuit 8 to the receiving circuit 5, and the receiving circuit 5 is tuned to a specific broadcast reception frequency, which is thereafter received and reproduced by the built-in DC power supply 7.

As is clear from the above explanation, in the event of a commercial AC power outage, the receiving device of this invention will forcibly operate to receive and regenerate a specific broadcasting power source using the built-in DC power source. Sometimes it is possible to obtain information about the disaster etc. sooner.

[Brief explanation of the drawing]

The drawing is a block diagram showing one embodiment of this invention. 1...Power plug, 2...Power switch, 3...
...Power transformer, 4...AC/DC conversion circuit, 5...Receiving circuit, 6...Detection circuit, 7...DC power supply, 8...
...control circuit.

Claims (1)

[Scope of utility model registration request] an AC/DC converter circuit that receives a commercial AC power source and rectifies the AC power input; a receiving circuit that is operated by the output of the AC/DC converter circuit to receive and reproduce broadcast radio waves; A detection circuit detects the presence or absence of an AC power supply, and this detection circuit operates when a power outage of the commercial AC power supply is detected, and supplies DC output from the built-in DC power supply to the reception circuit, and also supplies the DC output from the built-in DC power supply to the reception circuit. A receiving device comprising a control circuit for setting a specific receiving frequency.