JPS5913054B2 - Remote control device for electronic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote control device for electronic equipment having a switching regulator type power supply circuit.

When switching the power supply circuit of an electronic device between an operating state and a non-operating state by remote control, a relay is used and the contacts of this relay are turned on and off by a remote control signal generated by the remote control. is common.

For example, contacts of the relay are connected between a commercial power source and a power supply circuit, and supply of excitation current flowing through the coil of the relay is started or stopped in response to the control signal. In the method using such a relay, a holding means is required to keep the excitation current supplied in order to keep the electronic device in an operating state.
That is, while an electronic device is in operation, an excitation current of, for example, about several hundred mΛ needs to flow, so that the power consumption of the electronic device increases by the amount of excitation current. Furthermore, when using a relay, a large current flows through the mechanical contacts, which wears out the contacts, shortens the life of the relay, and may cause chattering, making its operation less reliable. An object of the present invention is to provide a remote control device for an electronic device that can use an electronic switch and does not require a holding means to keep the electronic switch in a constant state during operation of the electronic device.

The present invention provides an unstabilized DC power supply, a switching element that connects and disconnects the unstabilized DC power supply voltage, and a DC conversion means that converts the interrupted DC power supply voltage into DC again to generate a DC output voltage. and a load circuit to which the DC output voltage is supplied, and a circuit that detects fluctuations in the DC output voltage and receives a pulse signal generated in the load circuit to control the on/off of the switching element so as to cancel the fluctuations in the DC output voltage. An electronic device comprising a control circuit that is enabled to operate by being supplied with a DC output voltage, and a cutoff means that cuts off the supply of pulse signals from the load circuit to the control circuit by a remote control signal; Separately, a pulse generating means for generating a pulse signal and an electronic switch connected between the DC power source and the pulse generating means and turned on by a remote control signal are provided.

The present invention will be explained below with reference to FIGS. 1 and 2.

FIG. 1 is a circuit diagram showing an embodiment of a remote control device for electronic equipment according to the present invention.

By turning on the power switch 2, the rectifier smoothing circuit 3
converts the AC voltage from the commercial AC power supply 1 into unregulated DC voltage.

This unstabilized DC voltage is turned on and off by the switching element 4, and then converted to DC voltage again by the smoothing circuit 5. The DC output voltage obtained from the smoothing circuit 5 is supplied to the load circuit 6 and also to the control circuit 7. The control circuit 7 receives a pulse signal generated in the load circuit 6 to turn on and off the switching element 4, detects fluctuations in the DC output voltage, controls the above-mentioned connection and stabilizes the DC output voltage. The starting circuit 8 is composed of an astable multipipulator, and is operated by the charging current flowing through the capacitor 9 when the power switch 2 is turned on. The pulse signal is controlled by the starter circuit 8 during the period when the DC output voltage does not rise to a sufficient value because the starter circuit 8 operates instantaneously when the power switch 2 is turned on, that is, during the period when the pulse signal is not supplied from the load circuit 6. circuit 7
The switching element 4 is turned on and off. As a result, the DC output voltage increases to a sufficient value, and the load circuit 6
starts working. Note that the above circuit configuration is a known one. The electronic switches 10 and 11 are controlled to turn on and off by remote control signals, but the output of the rectifying and smoothing circuit 3 is used as the operating power for the electronic switch 10, and the output of the rectifying and smoothing circuit 3 is used as the operating power for the electronic switch 11. The output of the smoothing circuit 5 is used. The electronic switch 10 connects and disconnects the rectifying and smoothing circuit 3 and the starting circuit 8, and the electronic switch 11 connects and disconnects the input terminal 71 to which the pulse signal of the control circuit 7 is supplied and ground. The remote control signal is received by the microphone 12 and supplied to the electronic switches 10 and 11 from the receiving circuit 13. The resistors 14, 15 and the Zener diodes 16, 17 are used to obtain a low voltage from the unstabilized DC voltage and the stabilized DC voltage, and other means such as resistance division may also be used. . A negative pulse as shown in FIG. 2a is obtained at the output terminal 73 of the receiver 13 in response to the remote control signal. The receiving circuit 13 generates this negative pulse, for example, only at the moment when the supply of the ultrasonic signal to the microphone 12 is stopped.
is configured. When the power switch 2 is on, the receiving circuit 13 is in operation and can be remotely controlled.

When the electronic device is in a non-operating state, it receives a remote control signal and the second
When the negative pulse shown in Figure a occurs at the output terminal 73, the transistor 18 constituting the electronic switch 10 is turned on,
The pulse voltage shown in FIG. b is supplied to the starting circuit 8, and the starting circuit 8 is instantaneously activated. As a result, the electronic device starts operating. At this time, a negative pulse is also supplied to the electronic switch 11, but since operating power is not supplied to the electronic switch 11, the electronic switch 11 is not turned on and has no effect on the start of operation. On the other hand, when the electronic device is in operation, low voltage is also supplied to the electronic switch 11 by the resistor 15 and the Zener diode 17, so the output terminal 7
When a negative pulse is generated at 3, the electronic switch 11 is turned on.

That is, the transistors 19 and 20 are activated by the negative pulse.
turns on, which turns on the transistor 21. Therefore, since the input terminal 71 of the control circuit 7 is grounded, the pulse signal for turning the switching element 4 on and off is no longer supplied to the control circuit 7. Therefore, input terminal 7
1 is grounded, no power is supplied to the smoothing circuit 5, the DC output voltage decreases, and the load circuit 6 no longer generates a pulse signal. Even if the electronic switch 11 is turned off again after the generation of the pulse signal from the load circuit 6 has stopped, no pulse signal is supplied to the input terminal 71, so that the electronic device maintains its non-operating state. When the electronic device is in operation, the electronic switch 10 is also momentarily turned on by the negative pulse, but since the input terminal 71 is grounded, this does not affect the electronic switch 10 in any way. Note that FIG. 3c shows the input terminal 71.
Indicates the DC voltage of The capacitors 22 and 23 are used to maintain the on period of the transistor 21 until the load circuit 6 no longer generates a pulse signal. As described above, according to the present invention, it is possible to control an electronic device between an operating state and a non-operating state by remote control without using a relay, and moreover, during the operating period of the electronic device, the electronic switch 10,
There is no need to turn on 11.

Furthermore, since the operating state and non-operating state can be switched with one type of remote control signal, there is no need to use two types of remote control signals, one for starting the operation and one for stopping the operation.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of a remote control signal for an electronic device according to the present invention, and FIG. 2 is a voltage waveform diagram of its main part. 3... Rectifier smoothing circuit, 4... Switching element, 5... Smoothing circuit, 6... Load circuit, 7... Control circuit. , 8... Starting circuit, 10, 11... Electronic switch, 13...
...Reception circuit.

Claims (1)

[Claims] 1. An unstabilized DC power supply, a switching element that connects and disconnects the unstabilized DC power supply voltage, a DC conversion means that converts the interrupted DC voltage into DC again, and generates a DC output voltage, and a DC output voltage. a load circuit supplied with
Generates a remote control signal in electronic equipment consisting of a control circuit that detects fluctuations in DC output voltage and controls the on/off of switching elements in response to pulse signals generated in the load circuit to cancel fluctuations in DC output voltage. an operation signal generator that is enabled to operate by being supplied with a DC output voltage, and a cutoff means that cuts off the supply of pulse signals from the load circuit to the control circuit when it receives a remote control signal while in the operable state. , a remote control for electronic equipment comprising: a pulse generating means that generates a pulse signal separately from the load circuit; and a switch means connected between the DC power supply and the pulse generating means and turned on by a remote control signal. Operating device.