JPS60129815A - Power supplying device - Google Patents

Abstract

PURPOSE:To reduce the number of transformers and reduce the space and cost of a power supplying device, by collectively winding two transformers around one core and installing a changeover circuit to the load winding side of a sound output circuit, etc. CONSTITUTION:When a TV receiver is set to a receiving condition, a relay 11 is operated by a transistor (Tr) 10. Since the Tr10 is turned on and its collector A is connected with another Tr14 through a diode 12 and resistance 13 at this moment, the Tr14 is turned on. When the Tr14 is turned on, two more Trs 15 and 16 are also turned on and, as a result, power supply is made to the load circuit 4 of a sound output circuit, etc. At the time of idling, the Tr10 is controlled under a turned off condition because no power supply is required to the TV receiver. Under this condition, however, a voltage which is sufficient to turn on the Tr14 is added to the collector A of the Tr10 through a resistance 17 and the coil of the relay 11. Since the Trs 15 and 16 are turned off when the Tr14 is turned on, no electric power is supplied to the load 4 and unnecessary power consumption is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a power supply device that can be used in a television receiver or the like equipped with a remote control (1) remote control device.

Conventional Structure and Problems Theretofore, in a television receiver having a remote control device, a power supply device for a high power load circuit such as an audio output circuit has been structured as shown in FIG. In this television receiver, when a main power switch 1 is closed, a remote control receiving circuit 2 opens and closes a relay 3 to turn on and off the power to the television receiver. In this conventional power supply device, a transformer 5 is provided for a high-power load circuit 4 such as an audio output circuit, and when the television receiver is set to a receiving state by a remote control operation, a relay 3 transmits audio through the transformer 5. Power is supplied to a load circuit 4 such as an output circuit. However, in such a conventional circuit, two power transformers 5 and 6 are used for the remote control receiving circuit 2 and the load circuit 4, which requires a lot of space and also increases cost. There was a drawback that it ended up happening.

OBJECTS OF THE INVENTION The present invention solves the conventional problems and provides a power supply device that can reduce the number of power transformers used, thereby reducing space and cost.

Structure of the Invention In the present invention, conventionally two transformers are wound together into one core, and a switching circuit is provided on the winding side for a load such as an audio output circuit. When the receiver enters the receiving state, the switching circuit is operated to supply power to loads such as the audio output circuit.

Description of examples FIG. 2 shows a circuit configuration of an embodiment of the present invention.

Note that the same parts as in the prior art are given the same reference numerals as in FIG.

In this device, a transformer 7 is provided with two secondary windings 8°9, the winding 8 supplies power to the remote control receiving circuit 2, and the winding 9 supplies power to the rectifier circuit 1O for the load 4.

When the television receiver is placed in a receiving state using the remote control or the main power switch 1, the relay 11 is operated by the transistor 1°. At this time, transistor 1○ is in a conductive state, and its collector A is connected to diode 12 and resistor 13.
It is connected to transistor 14 through. Therefore, transistor 14 becomes non-conductive. Then, the transistor 15 becomes conductive, and by making the transistor 16 conductive, the load circuit 4 such as the audio output circuit etc.
to supply power.

Next, the operation when the main power switch 1 is closed and the television receiver is turned off by the remote control and is in a standby state will be described. There is no need to connect the television receiver to power during standby.

Therefore, transistor 10 is controlled to be non-conductive. At this time, a voltage sufficient to turn on the transistor 14 is applied to the collector A of the resistor 17 and the relay 11.
is applied through the coil. When the transistor 14 becomes conductive, the transistors 15 and 16 become non-conductive, so power is not supplied to the load 4 such as the audio output circuit, and unnecessary power is not consumed.

Effects of the Invention As described above, according to the present invention, the space cost can be reduced by combining the conventional two power transformers into one, and furthermore, the power consumption during standby is reduced to only the iron loss of the transformer. It is possible to realize a power supply device that can reduce the number of power supplies.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional power supply device, and FIG. 2 is a circuit diagram of a power supply device according to an embodiment of the present invention. 1...Main power switch, 2...Remote control receiving circuit, 4...Load circuit, 7...Power transformer, 8゜9...2 Next winding, 1o...
...Transistor, 11...Relay, 14,1
5.16...transistor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] The primary winding and the first and second windings connected to a commercial AC power supply.
a power transformer having a secondary winding; a remote control signal receiving circuit connected to the first secondary winding; a rectifier circuit connected to the second secondary winding; and the receiving circuit. When the power-on control signal is input, the circuit is closed by the control signal output from the receiving circuit to supply the output of the rectifying circuit to the load, and when the power-off control signal is input, the circuit is closed by the control signal output from the receiving circuit. a switching circuit that opens in response to an output control signal to cut off supply of the output of the rectifier circuit to the load;