Light switch with remote control. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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The device, the scheme of which is shown in fig. 1. Designed to turn on household lighting using any remote control.
Fig.1 (click to enlarge)
The operation of the device is as follows. The signal from the IR remote control is perceived by the infrared radiation receiver, made on the IC DA1 and amplified by it. As a result, a burst of rectangular pulses appears at pin 3 of the IC. They are detected by a chain made on the elements R1, VD1, R3. Capacitor C2, together with resistor R4, form a delay line, which forms one pulse train of long duration, which is fed to input C (pin 3) of trigger DD2.
The trigger is enabled in the counting mode, so each subsequent pulse switches it to a state inverse to the previous one. IC DD2 controls the transistor VT1, which switches the power thyristor VS1, turning on or off the power of the pump HL1. Thus, a short press on any button on the remote control either turns the light on or off. It should be noted that the incandescent lamp is powered by a constant voltage rectified using the VD3 bridge, so the maximum lamp power directly depends on the parameters of the diode assembly.
The device has a galvanic connection to the AC mains, so special precautions must be taken during commissioning.
On fig. 2 shows the printed circuit board of the switch, designed to install miniature parts. The board is made of one-sided foil fiberglass. The most bulky of the components is the VS1 thyristor, but it can be replaced with a small-sized one, for example, the T122 series.
The device practically does not need to be adjusted and starts working immediately after being turned on, but for better performance it is desirable to select the capacitance of the capacitor C2 according to the duration of the pulses sent from the remote control.
Author: A.Filipovich, Minsk region, Dzerzhinsk
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