JPS6057299B2 - power control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply control device for a television receiver or the like having a timer function, and more particularly to a remote control timer device.

Conventionally, there have been television receivers equipped with a so-called timer function that automatically turns off the power after a certain amount of time has elapsed, but most conventional television receivers have generally been mechanical. However, in recent years, functions such as powering on and off, channel selection, and volume adjustment of television receivers can be operated by remote control, making them even more convenient. Among them, only the timer function was mechanical, which made it difficult to operate remotely.
Furthermore, as a means of turning off the power of a television receiver, it is known that a thyristor is used in the power stabilization circuit of the television receiver, and the gate of the thyristor is electrically controlled, but this is not the case. In this case, a relay is inserted into the AC power line and the power is turned on and off under control of the relay.

However, in this case as well, since the timer is of a mechanical type, a relay used for remote control and a relay 1 used for the timer are required separately, resulting in an increase in cost. Therefore, in the past, except for high-end sets, television receivers with remote control functions generally did not have a timer function. Therefore, the present invention overcomes these conventional drawbacks and makes it possible to provide a timer function even in a television receiver with a remote control function without causing a large cost increase. The object of the present invention is to provide a device that allows setting of a timer.

EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment thereof.

FIG. 1 shows a circuit diagram of an embodiment of the present invention, and FIG. 2 shows a waveform diagram for explaining its operation.

In FIG. 1, reference numeral 1 denotes a remote control transmitter for remotely controlling functions such as turning on/off the television receiver, adjusting volume, and setting a timer, and emits a pulsed optical signal. Here, it is assumed that the pulse interval or the number of pulses is varied depending on the function to be controlled. The optical signal transmitted by the transmitter 1 is received by the photoelectric element 3 of the receiver 2 and converted into an electrical signal, which is identified by the control signal generating circuit 4 and then connected to each circuit to be controlled. .

For example, 5 is a control output for controlling timer setting and setting cancellation, 6 is a control output for turning off the power, and 7 is a control output for turning on the power. The timer is composed of an oscillator 8, a frequency divider 9, and its peripheral circuits.

Oscillator 8 is a CR oscillator whose oscillation frequency is C1 and R1
It is determined by The output of the oscillator 8 is applied to a frequency divider circuit 9 composed of n stages of flip-flops, and the frequency is divided into 112n. Therefore, the set time of the timer can be changed by the time constant of the capacitor C1 and the resistor R1, and the longer this time constant, the longer the set time. This oscillator 8 is 0
The output of the R circuit 10 switches between oscillation operation and oscillation stop. When the output of the 0R circuit 10 is at H level, it oscillates, and when it is at L level, it stops oscillating.

R is an input terminal for a reset signal, and S is a stop terminal. The reset terminal R is connected to the reset input line of the frequency divider circuit 9 and the input of the 0R circuit 10. The table below shows the R input terminal and S input terminal. The states of the oscillator 8 and frequency divider 9 and the state of the output of the frequency divider 9 with respect to the power level are shown. The timer function shown in FIG. 1 will be explained using FIG. 3.

First, it is assumed that normally, when the timer is not set, the output b1 of the flip-flop 12, that is, the R input, is at the L level. In order to keep the output of transistor 12 at the L level even when the power is turned on, the transistor Q1 is temporarily turned on through the capacitor C2 when the power is turned on.
The period up to t1 indicates a state in which the timer is not set during normal operation. b indicates the output voltage of the flip-flop (hereinafter referred to as FF) 12. If the output of FF12 is at L level, the oscillator 8 stops oscillating and the output of frequency divider 9 becomes H level as shown in the table above. Therefore, the output of inverter 13 is at L level, the output of 0R circuit 14 is also at L level, and the base input level of transistor Q3 is also at L level. 15 is a relay that turns on and off the power; when transistor O turns on in a pulsed manner, the power turns off, and transistor Q
, is turned on in a pulsed manner, AC power is applied to the power supply circuit 16 of the receiver, and the power is turned on.

It is assumed that the power supply 16 is in operation and in an image receiving state until t1.
Next, assume that a timer setting button (not shown) on the remote controller is pressed.

Then, as shown in a, a pulse with a constant pulse width is applied from the output 5 of the remote controller receiver to FF12. Then,
The output of FF12 becomes H level, the oscillator 8 starts oscillating operation, and the frequency divider 9 starts a low count operation. Oscillator 8
When the output is divided by the n-stage frequency divider 9, the state of the divided output changes from the H level to the L level as shown in b, depending on the oscillation period. By delaying the fall of this change using resistor R3 and capacitor C3, a signal with the waveform e is created, and when this signal is inverted and amplified by transistor Q2, it rises at T3, which is somewhat delayed from the falling point T2 of the frequency divider output. A signal f can be generated. This output f is differentiated by a capacitor C4 and a resistor R4 to create a signal with a waveform like g, and this output g is added to the 0R circuit 5, which inverts the output b of FFl2 and sets it to L level, returning it to its original state. to stop the oscillation operation,
Set the divided output to H level. Therefore, as the output of the inverter 13, a pulse signal having a pulse width T3-T2 is generated as shown in d. This turns on the transistors, controls the relay 15, and turns off the power supply 16. Next, a case in which the timer is set and then wants to be canceled will be explained. To set on T4, press the button on transmitter 1 for remote control, and set FFl as described above.
Assume that the output of 2 is set to H level and oscillation and counting operations are started. When canceling, press the timer setting button on the transmitter 1 for remote control again. Then, the FF is controlled by the remote control output pulse.
The output of l2 becomes L level again, returning to the normal state.
Further, when turning off the power using the remote control, it is assumed that the power off button of the remote control transmitter 1 is pressed and a corresponding control signal appears from 6 of the control generation circuit 4. Add this output to the input terminal of the 0R circuit 14,
The relay 15 is controlled by turning on the transistor O in response to either a signal from the timer or a power-off signal from the remote control. As described above, according to the present invention, a timer circuit comprising an oscillator and a frequency divider, a timer setting signal pulse are applied, a bistable multi-circuit for driving the timer circuit, and a control signal for turning on the power are applied. Used to turn on and off the power supply by remote control by using a first switching element, a control signal for turning off the power supply and a second switching element to which the divider output signal is applied. It is possible to easily share the relay used to turn off the power with a timer and the relay used to turn off the power with a timer, thereby reducing costs. At the same time, there is an effect that it is easy to introduce a remote control function and a timer function into a television receiver or the like at the same time. Also, due to the function of the transistor connected to the output terminal of the bistable multi-circuit, when the power is turned on,
The timer circuit can necessarily be set to an initial non-operating state. Particularly in recent years, when additional functions are the deciding factor in purchasing rather than the essential performance of television receivers, it can be said that producing additional functions at low cost has a great effect.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a power supply control device according to an embodiment of the present invention, and FIG. 2 is a waveform diagram of each part thereof. DESCRIPTION OF SYMBOLS 1... Transmitter for remote control, 2... Receiver for remote control, 8... Oscillator, 9...
...Frequency divider, 10, 11, 14...0R circuit, 12.
...Flip-flop, 13...Inverter, 15.
... Relay, 16... Power supply circuit.

Claims (1)

[Claims] 1 a relay for turning on or off a power line; a first switching element that conducts when a control output signal for turning on the power by remote control is applied to drive the relay to turn on the power; , a timer circuit consisting of a bistable multi-circuit to which a timer setting signal pulse is applied by remote control, a timer oscillator and a timer frequency divider driven by the output of this bistable multi-circuit, and a frequency division of this timer circuit. The output of the device and a control signal to turn off the power by remote control are applied via an OR gate, and when at least one of the signals is supplied, the relay becomes conductive and drives the relay to turn off the power. The output of the frequency divider is configured to be fed back to the input terminal of the bistable multi-circuit, and the collector of the transistor is connected to the output terminal of the bistable multi-circuit, and the transistor The emitter of the transistor is grounded, and a signal is added to the base of the transistor that depends on the rising edge when the power supply circuit that drives the timer circuit is switched on, so that the transistor is turned on only when the power supply circuit is switched on. A power control device featuring: