KR910005923Y1 - Power supply circuit for tv - Google Patents

Abstract

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Description

TV "on" circuit when broadcasting signal is applied

Circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: Micom 2: Tuner

3: standby power supply unit 6: image intermediate frequency processing integrated device

7: horizontal synchronization separator 8: integrator

9: control voltage generator 10: relay driver

Q ₁ , Q ₂ : Transistor SW ₁ : Switch

RY: Relay

The present invention relates to a television "on" circuit upon application of a broadcast signal that causes the television to be "on" with a single switch when a broadcast signal is applied while the master switch of the television is "on."

Conventional television " on " circuits have a disadvantage in that complicated circuit configurations are required because the televisions are driven by combining the detected voltages after detecting the horizontal and vertical synchronization signals in the broadcast signal and the automatic fine adjustment voltage.

In view of the above, the present invention allows the television to be "on" automatically when a broadcast signal is applied in a single switching operation when the master switch of the television is "on". After applying the circuit to the circuit in advance, the horizontal synchronous separation signal detected when the broadcast signal is applied is converted into a DC voltage in the integrator to drive the relay to automatically turn on the television "on".

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

The present invention generates a standby power supply using AC power and supplies it to each stage of the TV. When a broadcast signal is applied, the horizontal synchronous signal is changed from an integrator to a DC voltage to drive a control voltage generator to drive a relay. This allows the television to be "on" automatically when a broadcast signal is present.

In other words, the present invention is supplied to the main power through the rectifier 11 when the AC power is through the condenser (C ₁ ) and the line filter (L ₁ ) and the relay (RY) is "on", and the AC power is also supplied to the transformer (T _1). Standby power supply to each end of the circuit such as the power supply terminal (V _DD ) of the microcomputer 1 and the power supply terminal (B ⁺ ) of the tuner 2. And outputs the intermediate frequency (IF) output of the tuner 2 to the image intermediate frequency (VIF) processing integrated device 6 through the preamplifier 4 and the sawtooth filter 5.

The output of the image intermediate frequency processing IC is applied to the horizontal synchronizing separator 7 so that the horizontal synchronizing signal is separated and then applied to the integrator 8 to integrate the DC level of the integrator 8. The output is configured to drive the control voltage generator 9 composed of resistors R ₁ -R ₃ and transistor Q ₂ , and then the output of the control voltage generator 9 is relayed through the diode D ₂ . The relay driver 10 is configured to drive the driving transistor Q ₁ .

At this time, in the present invention, the transistor Q ₁ is configured to be controlled to be driven by the power terminal PWR output of the microcomputer 1, and the TV automatic " on " switch SW ₁ between the AC power supply and the standby power supply unit 3. Configure to be connected.

Referring to the effect of the present invention configured in this way in detail as follows.

First, an operation of "turning on" a television by using a power switch such as a general remote controller will be in a state in which the switch SW ₁ is "off".

Therefore, when the power switch, such as a remote control is pressed, the microcomputer 1 recognizes it through a recognition stage (not shown) and outputs a high level pulse to the power terminal PWR, and the relay driver 10 by the high level pulse. Transistor Q ₁ is " turned on ".

When the transistor Q ₁ is "turned on", the relay RY is driven so that the AC power applied through the capacitor C ₁ and the line filter L ₁ is supplied to the main power after passing through the normal rectifier 11. The television is thus "on".

That is, when the switch SW ₁ is "off", the main circuit of the television is operated by driving the relay RY by outputting a high level pulse from the microcomputer 1 to the power terminal PWR by manual operation. This operation is the same as the driving circuit of a conventional remote control television.

However, if the switch SW ₁ is turned "on" to automatically turn on the television when a broadcast signal is applied, the AC power is supplied through the standby power supply unit 3, and then the microcomputer 1 and tuner 2 as standby power. The image intermediate frequency (VIF) processing integrated element 6, the horizontal synchronization separator 7, the integrator 8, and the control voltage generator 9 are supplied in advance.

In this case, when the user manually turns on the power switch, the television is turned on as described above. However, when the user does not press the power switch, the user waits in the standby state until a broadcast signal is applied.

However, when a broadcast signal is applied, the broadcast signal tuned by the tuner 2 is an intermediate frequency (IF) signal through the preamplifier 4 and the sawtooth filter 5, and then the image intermediate frequency (VIF) processing integrated device 6. Is applied to the horizontal intermediate separator (VIF) signal to be applied to the horizontal synchronization separator 7

That is, when a broadcast signal is applied while the switch SW ₁ is turned on, the intermediate frequency IF signal of the tuner 2 passes through the image intermediate frequency VIF processing integrated device 6, and then the horizontal sync separation unit ( 7) and separately detects the horizontal sync signal in the broadcast signal, and the separated horizontal sync signal is integrated in the integrator 8 and applied to the control voltage generator 9 at a constant DC level.

Therefore, when a broadcast signal is applied, the constant DC level output from the integrator 8 "turns on" transistor Q ₂ to which resistors R ₁ -R ₃ are connected, and the emitter output of transistor Q ₁ is a diode ( The transistor RY is driven by " turning on " the transistor Q ₁ of the relay driver 10 through D ₂ ) so that the main power is supplied from the rectifier 11.

Therefore, if a broadcast signal is applied after supplying AC power and turning on the switch SW ₁ , the control voltage generator 9 operates as described above to operate the relay driver 10 to operate the main power supply. To automatically turn on the TV.

However, when the switch SW ₁ is "off", the standby power supply is cut off, so that the operation is not automatically "on" as described above, and is operated by the existing manual switch.

As described above, the present invention supplies the standby power to each end of the circuit using AC power, and then operates the relay driver by controlling the control voltage generator by leveling the DC signal to DC level when there is a broadcast signal of the tuner. The television is "on" in the presence of the dispatch signal.

Therefore, the present invention has an effect of automatically turning on the television when the broadcast signal is applied by one switching operation using a simple circuit that does not go through a complicated circuit configuration.

Claims (2)

In the power supply circuit of a remote control-enabled television, an intermediate frequency (IF) of the television "on" switch SW ₁ connected between the standby power supply unit 3 and the AC power supply terminal, and the tuner 2 to which the standby power is applied. ), An image intermediate frequency processing integrated device 6 for detecting an image intermediate frequency signal among the signals, a horizontal synchronization separator 7 separating a horizontal synchronization signal of the image intermediate frequency signal, and a horizontal synchronization separator 7 A television " on " circuit upon application of a broadcast signal comprising an integrator (8) for leveling a horizontal synchronizing signal and a control voltage generator (9) driven by the output of the integrator (8) to operate a relay driver (10). The method of claim 1, wherein the control voltage generation unit 9 is outputted to the resistance (R ₁ -R ₃₎ is connected to the transistor (Q ₂₎ to drive the emitter output to the relay driving transistor (Q ₁ for the integrator (8) A television "on" circuit upon application of a broadcast signal configured to drive a TV;