KR940007499Y1 - Automatic tv receiver power off circuit - Google Patents

Abstract

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Description

Automatic power off circuit of sound equipment

1 is a circuit diagram of this article.

* Explanation of symbols for main parts of the drawings

A: input stage 1: radio call detection circuit

2: RC combining circuit 3: amplifier

4: logic circuit 5: timer circuit

6: main power C ₁ -C ₁₃ : condenser

R ₁ -R ₁₁ : Resistor Q ₁ -Q ₃ : Transistor

RL ₁ -RL ₂ : Relay SW ₁ -SW ₂ : Switch

IC ₁ : Detection IC IC ₂ : Time Detection IC

The present invention relates to the power supply is cut off when the broadcast is interrupted, and more particularly, to an automatic power cut-off circuit of an audio device that can cut off the main power of the sound device by detecting no signal after the broadcast is finished.

In the case of a general audio device, when the broadcast is completed, the listener has artificially cut off the power, but if the broadcast is completed while the listener is in bed, only the noise is output to disturb the bed or cause unnecessary power loss. will be.

This proposal was devised to solve the above problems. By eliminating the trouble of the listeners, it is possible to detect a signal without an acoustic signal for a certain period of time after the broadcast ends and automatically cut off the main power supply of the audio device according to the detection result. The purpose of this paper is to improve the reliability of sound equipment by preventing unnecessary loss of power.

When described in detail by the accompanying drawings as follows.

As shown in FIG. 1, an input terminal A to which a signal or no signal is input is connected to a base of transistor Q ₁ that is turned on when a signal is applied, and when the voice signal is generated, the transistor Q ₁ emits a high signal. An amplifier which raises the RC combining circuit (2) consisting of a resistor (R ₇ ) and a condenser (C ₄ ) and outputs a signal of "low" in case of maintaining a state and not generating a voice signal for a certain period of time. (3) is connected to a logic circuit (4) for outputting a high (H) signal when the input signal is all low (L), and the transistor (Q ₁ ) emitter does not contain a voice signal and noise is accompanied Timer circuit (5) with time detection IC (IC ₂ ) which performs a time count with a signalless detection circuit (1) with detection IC (IC1) to maintain a low (L) signal for a predetermined time to detect no signal. Is connected to the logic circuit 4 through), and the logic circuit 4 is That is configured to be applied when connected to be conductive the transistor (Q ₃₎ and the base, connected to the relay (RL2) to a no-signal output when the switch (SW2) to its collector "off" to block the main power source (6).

The detection IC IC1 of the non-signal detecting circuit 1 is connected to the base of the transistor Q2 which is turned on when a non-voice-free signal is applied, and a relay RL1 driven at turn-on is connected to its collector. The switch SW1, which is turned ON by the relay RL1, is configured to be connected to an input terminal of the time detection IC IC2 of the timer circuit 5.

Referring to the operation and effects of the present invention composed of the above configuration as follows.

When the voice signal is applied at the input terminal A, when the transfer is completed, the voice signal is not output and no signal is output with only noise.

Therefore, when no signal with such noise is applied to the base of the transistor Q1 via the capacitor C1, the transistor Q1 is turned on and the capacitors C2 and C3 connected to the emitter. And the detection IC IC1 of the signal-free detection circuit 1 through the resistors R ₄ -R ₆ .

Therefore, when the detection IC IC1 of the no signal detection circuit 1 outputs a noise signal of the voice signal, the signal IC does not include the voice signal and detects the non-signal and outputs the "HIGH" signal through the resistor R9. As the relay RL1 is operated as it is applied to the base of the transistor Q2 to make the conductive state, the switch SW1 interlocked with the transistor RL1 is connected to the ON state so that the time detection IC (IC2) of the timer circuit 5 is connected. Power flows to start the time count, and after a predetermined time (about 2 minutes) from the time detection IC (IC2) of the timer circuit 5, a "LOW" signal is output to the logic circuit 4 It detects no signal for a certain time.

On the other hand, the RC combining circuit 2 detects a voice signal. When the voice signal is detected, a "high" signal is output. At this time, the voice signal is not detected when the broadcast is stopped. A "LOW" signal is applied to the logic circuit 4.

Therefore, when two signals input to the logic circuit 4, that is, a "low" signal output from the time detection IC IC2 of the timer circuit 5 and the "low" signal input from the RC combining circuit 2 are simultaneously applied, The output signal of the circuit 4 becomes a "HIGH" signal and acts as a bias voltage on the base of the transistor Q _{3. As} a result, the transistor Q3 is brought into a conductive state and the relay RL2 operates to operate the main power supply ( The switch SW2 to which 6) is input is turned off to cut off the power of the acoustic instrument.

That is, when the broadcast is interrupted, the detection IC (IC1) of the no-signal detection circuit 1 detects a no-signal that does not include a voice signal and detects it for a predetermined time by the time detection IC (IC2) of the timer circuit 5. As a result of this, it is to automatically cut off the supply of the main power supply 6 of the sound equipment.

As described above, the subject of the present invention is to sleep the sleeper due to the noise output when the broadcast is interrupted by automatically shutting off the power by determining whether the broadcast is stopped in the sound device itself even when the sound device is operated. Not only is it uninterrupted, it also reduces unnecessary waste of power, and extends the life of sound equipment, which is a useful design to improve reliability.

Claims (2)

The input terminal A, to which a broadcast signal or no signal is input, is connected to the base of the transistor Q1 that is turned on when a signal is applied, and when the voice signal is generated, the transistor Q1 is maintained in a "high" state and a voice for a predetermined time. If no signal is generated, both the input signal is passed through the RC combining circuit (2) consisting of a resistor (R7) and a condenser (C4) and an amplifier (3) that raises the signal in order to regard a signal and output a "low" signal. Connect to the logic circuit 4 which outputs a high H signal when low L, and the transistor Q1 emitter IC1 is used to detect no signal with no noise and no noise. Is connected to the logic circuit (4) through a timer circuit (5) of time detection IC (IC2) which performs a time count with a no-signal detection circuit (1) consisting of a time detection IC (IC2). The logic circuit 4 conducts when a high signal is applied. Is connected to the base of the transistor (Q3), and the collector of the sound device, characterized in that the relay (RL2) for disconnecting the main power supply 6 by "switching off" the switch (SW2) when no signal output Power breaker. 2. The relay of claim 1, wherein the detection IC IC1 of the non-signal detecting circuit 1 is connected to a base of a transistor Q2 that is turned on when a non-voice-free signal is applied, and the collector is turned on when the relay IC is turned on. And a switch (SW1) connected to the RL1 and connected to the time detection IC (IC2) input terminal of the timer circuit (5) connected to the ON switch by the relay (RL1).