JPS5911029A - Automatic power-off circuit - Google Patents

Abstract

PURPOSE:To realize the prevention of power from being left not turned off and the function as a sleep timer, by constituting a titled circuit that the power supply is turned off after a prescribed time after a set is not in operation. CONSTITUTION:A sound signal inputted from a sound signal input terminal is rectified at a rectifier circuit and inputted to a base of a transistor (TR) 8. The TR8 is turned on with its input, a terminal 30 of a PUT7 goes to ground potential, a timer circuit using the PUT7 is inoperative and a TR10 is turned off and a TR11 turns on. Thus, a relay 6 is operated to turn on a contact 5 and set is operative. When the sound signal is lost, the TR8 is turned off. Then, a capacitor 17 is started for charging via a resistor 24, and at the moment when the potential exceeds a potential at a terminal 29 of the PUT7, the PUT7 turns on. When the PUT7 turns on, the TR10 turns on, and the TR11 is turned off, the relay 6 is restored, the contact 5 is opened and the circuit of the set is released from the power supply.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is applicable to digital amplifier 0, pushbutton, television,
In sets such as buses, radios, etc., audio signals or meeting (Mutir+g) signals are used as control signals to automatically disconnect the power supply circuit after a certain period of time after Nananodo is no longer in use. (This is related to side roads.)

(Configuration of conventional example and its problems) Conventionally, when attempting to automatically cut off the power input to a set of audio equipment, etc., a separate timer was normally used. Since it is controlled by time regardless of whether it is in use or not, there are many inconveniences in setting the one-hour timer.

(Objective of the Invention) The present invention was devised to eliminate such drawbacks, and uses an audio signal, a muting signal, etc. as a control signal for a timer, and if the signal is present, the timer is reset. The purpose of this invention is to realize the functions of a timer and a sleeve timer by leaving it in the standby position and having it operate as a timer if the signal card/l is turned off.

(Configuration of criminal example) As shown in the block diagram in FIG.
a circuit 11 that generates a timer setting signal;
It consists of a timer circuit (2) that outputs a signal for a certain period of time after the control signal disappears, and a circuit (1v) that controls a relay that turns on and off the power of the set based on its output signal.

(Description of Embodiment) FIG. 2 shows a circuit configuration of an embodiment according to the present invention, and here shows an example in which an audio signal is used as a control signal.

In the figure, 1 and 2 are the power button of the set of audio equipment and connection terminals to the circuit of the set, 3 is the input of the audio signal which is the control signal ☆1i11-r-14 is the power switch, and 5 is the relay 6 contacts, 700 logramable unino used for 7 & timer circuit 1. Programmable Unijuncti
onTransistor, hereinafter referred to as PUT. ),
8-11 are transnostars, 12-]5 are diodes, 1
6 to 10 are diodes, 20 to 28 are l (anti, 29,
301, PUT 7 terminal.

The audio signal inputted from the audio signal input terminal 3 is rectified by a rectifier circuit including diodes 14 and 15 and capacitors 18 and 19, and then inputted to the trannostar 80 base.

Trannostar 8 is turned on by its human power and PUT
Terminal 30 of PUT 7 becomes ground potential, PUT 7 remains off, and the timer circuit using PUT 7 does not operate.
The trannostar 10 remains in the OFF state, and the collector potential rises to turn the trannostar 110 on. Therefore, the relay 6 moves and the 71st point 5 turns on, and 1 and 1 operate.

Next, when the M voice signal disappears, the base potential of the trannostar 8 drops and it becomes off. Then, the capacitor 17 starts charging through the resistor 24, and the current input becomes JJ":
P determined by ti′+′, 2 + and 22
PUT at the moment when the potential of end r20 of UT7 is set to 1:
7 is turned on.

When PUT 7 is turned on, the base current of transistor 10 flows and turns it on, and its collector potential becomes F, so transistor J1 turns off, relay 6 is restored and its contact 5 is opened, and the set circuit is It is disconnected from the power supply.

The switching transistor 9 is also turned on as the I"UT 7 is turned on, and operates to maintain the base of the transformer transistor 8 at the ground potential, thereby self-maintaining the circuit.

Note that if the resistor 23 is set to a large value, the timer by PUT 7 will continue to be held.

(Effect of the invention) Rabbit, as mentioned above: According to the present invention, the power is turned off after a certain period of time after the cellphone 1- is no longer in use, so the time setting like that of a conventional timer is not required. There are advantages such as contributing to energy saving as there is no need to turn off the switch and it prevents you from forgetting to turn it off.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the present invention in detail, and FIG. 2 is a diagram showing a circuit configuration of an embodiment according to the present invention. 1: Control 41 signal, 11: Reset signal generation circuit, IIl: Timer circuit, IV: Relay control circuit, 1: Power supply terminal, 2: Circuit terminal, 3: Hatake voice signal input End r, 4...Power switch, 5...Relay 6 contact, 6...Relay, 7...PUT, 8~II...Tranometa, 12~15・Diode, 16~19・-
・Capacitor, 20-28...Resistance, 29, :3
0...Terminal. Figure 1 Figure 2

Claims (1)

[Claims] A circuit that generates a timer reset signal by the 111 Sumoiha, a timer circuit that outputs a signal after a certain period of time after the control signal disappears, and a relay that turns the power supply circuit on and off is controlled by the output signal. A mate circuit characterized by having a circuit.