KR910007419Y1 - Tv/radio switching circuit - Google Patents

Abstract

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Description

TV / Radio Switching Circuit Using Same Power Source

Circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

10: constant voltage unit 20: micom

30: radio drive unit 40: main power control unit

1: radio mode control power supply unit 2: rectification and smoothing unit

3: radio unit 4: horizontal drive

Q1: Output terminal R1-R6: Resistance

Q1-Q4: Transistor C1-C3: Capacitor

D1: Diode BD1: Bridge Diode

ZD1: Zener Diode L1: Coil

RS1: Bridge Diode ZD1: Zener Diode

L1: Coil RS1: Relay Switch

RY1: Relay SW1: Switch

AMP: Amplifier SP1: Switch

P1: plug T1: transformer

The present invention relates to a TV / radio switching circuit using the same power source to switch the operation of the radio of the TV using the same power source in a TV with a radio.

Conventionally, in a TV with a built-in radio, a power circuit necessary for driving a TV of a power circuit for driving a radio is configured, and each power circuit is driven by an external selection switch to select a TV drive or a radio drive. .

As a result, the power circuits for driving the radios and TVs are overlapped, which complicates the circuit configuration and makes it difficult to lighten and shorten the set.

The present invention is intended to provide a TV / radio switching circuit using the same power supply by supplying the remote control standby power of the TV to the driving power of the TV and the radio in consideration of the above points. It controls the main power supply applied to the horizontal drive while controlling the standby power supply for operating the radio unit.

This will be described in detail with reference to the accompanying drawings.

AC power applied from the plug P1 is rectified by the bridge diode BD1, smoothed by the capacitor C1, and then applied to the switching mode control power supply unit 1 to supply the standby power and the main power. The standby power of the control power supply unit 1 is converted into a constant voltage in the constant voltage unit 10, and then applied to the microcomputer 20, and the main power supply of the switching mode control power supply unit 1 passes through the rectifying and smoothing unit 2, and the main power supply of the TV A TV with a built-in radio configured to be applied as an operating power source of the horizontal drive 4, wherein the operating power is applied to the horizontal drive 4 and operated by the power control signal output of the microcomputer 20. The main power control unit 40 is driven by the operation of the main power control unit 40 and the standby power of the constant voltage unit 10 is applied to the radio unit 3 It belongs to a radio provided with a driver 30.

Here, the main power control unit 40 is driven according to the transistor Q2 operated by the power control signal output of the microcomputer 20 and the horizontal drive 4 in the rectifying and smoothing unit 2 and driven according to the operation of the transistor Q2. And a transistor (Q3) for intermitting the operation power supply applied to the power supply, and the radio driver 30 is connected to the radio drive selection switch SW1, the switch SW1 and the power control signal output of the microcomputer 20. And a relay RY1 which is driven by the operation of the transistor Q4 and switches the standby power supply applied to the radio section 3.

And the radio signal according to the driving of the radio unit 3 and the audio signal output of the TV is configured to be output to the speaker SP1 through the amplifier (AMP) and the constant voltage unit 10 is a stent of the switching mode control power supply unit 1 After the bi-power is regularized and smoothed by the diode D1 and the capacitor C2, the Zener diode ZD1 is configured to be output at a constant voltage from the transistor Q1 connected thereto.

The effect of this configuration on the present invention will be described.

First, the AC power applied to the plug P1 is rectified by the bridge diode BD1 and smoothed by the capacitor C1, and then applied to the switching mode control power supply 1 so that the rectifying and smoothing part is performed by the switching mode control power supply 1. 2) Output the main power, while the standby power is output from the chopper transformer (T1).

The main power rectified and smoothed in the rectifying and smoothing unit 2 is applied as the main power supply of the TV, and is supplied as the operating power of the horizontal drive 4, and the standby power output from the chopper transformer T1 is the constant voltage unit 10. After rectification and smoothing at the diode D1 and the capacitor C2 of the X), the zener diode ZD1 is supplied to the power supply terminal Vcc of the microcomputer 20 at a constant voltage through the connected transistor Q1.

This state is the remote control standby state. Here, the microcomputer 20 recognizes the power key input and outputs a high level power control signal to the terminal (PW) when the power is 'on', and goes low to the terminal (PW) when the power is 'off'. Outputs the power control signal of the level.

Accordingly, when the power is 'on' to drive the TV, the microcomputer 20 outputs a high level power control signal. Accordingly, the transistor Q2 of the main power control unit 40 is 'turned off' and the transistor Q2 is turned on. Since the transistor Q3 is also 'turned off' by the 'turn off', the operating power applied to the horizontal drive 4 from the rectifying and smoothing unit 2 is normally supplied, thereby driving the horizontal drive 4.

Therefore, since the horizontal drive 4 is driven to generate a horizontal oscillation, the TV operates normally.

At this time, even when the ride selection switch SW1 is 'on', the collector side of the transistor Q2 becomes low level and the transistor Q4 is 'turned off', so that the relay RY1 does not operate so that the radio unit 3 ) Is not driven.

In other words, the operation of the radio is meaningless during TV operation, so that it is not driven.

However, when the TV is 'off', the microcomputer 20 outputs a low level power control signal to the terminal PW so that the transistors Q2 and Q3 of the main power control unit 40 are 'turned on'. The operation power applied to the horizontal drive 4 is cut off by 'turning on' of Q3), so that the operation of the horizontal drive 4 is interrupted, thereby stopping the TV operation.

In this state, when the radio selection switch SW1 is 'on', the collector of the transistor Q2 is at a high level, so the transistor Q4 is 'turned on' to excite the relay coil L1 so that the relay switch RS1 is 'on'. do.

When the relay switch RS1 is 'on', the standby part is supplied to the radio part 3 from the constant voltage part 10, and the radio part 3 operates.

Therefore, the radio can be operated when the TV is 'off', and the radio operation can be selected by 'switching' the switch SW1 'on' when the TV is 'off'.

The radio signal by the operation of the radio unit 3 or the TV audio signal by the TV operation are respectively amplified by the amplifier AMP and then output to the speaker SP1.

As such, the present invention is designed to stop the radio operation when the TV is on, and to turn the radio on / off when the TV is 'off', so that a separate power circuit is not configured for driving the TV and the radio. Instead of driving the radio using the TV driving power source, the power circuit configuration can be simplified.

Claims (3)

The rectified power from the bridge diode BD1 is output from the switching mode control power supply unit 1 to the main power supply and standby power supply, and the main power supply of the switching mode control power supply unit 1 is supplied from the rectifying and smoothing unit 2 to the horizontal drive ( In the TV with a radio, which is configured to apply to the operating power of 4) and to apply the standby power of the switching mode control power supply unit 1 to the microcomputer 20 at a constant voltage in the constant voltage unit 10, the microcomputer 20 The main power control unit 40 is driven by the power control signal output of the control unit and controls the supply of the operating power applied to the horizontal drive 4, and is driven in accordance with the operation of the main power control unit 40 and the radio unit 3. The TV / radio section using the same power source, characterized in that it comprises a radio driving unit 30 for controlling the standby power supply of the constant voltage unit 10 applied to the Circuit. The main power control unit 40 is a transistor (Q2) driven by the power control signal output of the microcomputer 20, the rectifier and smoothing unit (2) is operated by the drive of the transistor (Q2) And a TV / radio switching circuit using the same power source composed of a transistor (Q3) which intercepts the operation power supply applied to the horizontal drive (4). 2. The radio driver 30 according to claim 1, wherein the radio driver 30 comprises a switch SW1 for radio drive selection, a transistor Q4 operated by the connection of the switch SW1 and the power control signal output of the microcomputer 20, A TV / radio switching circuit using the same power supply which is driven by the operation of the transistor Q4 and constituted by a relay RY1 for switching the standby power supply applied from the constant voltage section 10 to the radio section 3.