Dependent switching on of loads. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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In some cases, dependent switching on of appliances powered by the mains is necessary. The simple scheme shown in the figure allows you to control two driven loads, depending on the inclusion of the main load.
In fact, there may be more driven loads - they are all connected in parallel to each other.
Power is supplied to the main load from the mains 220 V through a circuit of diodes VD1-VD4. On each of these diodes, approximately 0,7 ... 0,8 V of forward voltage drops.
When the main load is turned on, the mains voltage passes to the main load through these diodes, and about 2 ... 4 V drops on the VD2,1-VD2,5 diodes connected in series. The VD1 diode serves to pass another half-wave and does not take part in the formation of this voltage .
Negative half-waves are emitted by the VD5 diode and fed to the capacitor C1, on which a constant voltage is accumulated, sufficient for the nominal glow of the optocoupler LED. A1. The triac of the optocoupler opens, followed by the power triac VS1. The driven loads are turned on. Diodes 1N5408 can be replaced with KD226 diodes for a voltage of at least 400 V. Or other rectifiers of similar power and voltage. The number of series-connected diodes in the VD2-VD4 circuit may need to be clarified when setting up, it is possible to use not three, but four diodes. It is important that the voltage on C1 is sufficient to turn on the driven loads via optocoupler A1.
Author: Karavkin B.
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Comments on the article:
Sergei
Collected this scheme. Everything is working. But when used with a TV in standby mode, it remains on.
i10m
Refinement of this circuit for a powerful load. (The point is not to block the stove with a power of 10 or more watts with resistors). Take a low-power network transformer (with ordinary transformer iron). Any with a voltage on the primary of 127-220 V will do, and the secondary does not matter! With one point - there should be some free space on top of the transformer winding. To wind a dozen turns of thick MGTF wire, or any other insulated wire, with a cross section of at least 1.0 mm. Then, we connect the primary winding to a diode bridge, to the output of which we connect an electrolyte from 5 microfarads and higher to a voltage of 160-400 V (less is possible, more is better). We connect to the optocoupler through a resistor, at least 10 K and up to 30 K (experimentally, starting from 30 K and decreasing, reach a stable response threshold, no more than 30 mA of the operating current in the circuit). Good luck!
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