Quasi-sensor switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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The mains switch shown in the figure contains a small number of parts and consumes power only at the moments of switching on and off. It is made on the basis of a two-position polarized relay (remote switch) and is controlled by the SB1 button that is not fixed in the pressed position.
When the button is pressed, the capacitor C1 is quickly charged through the resistor R1 and the diode VD2 with a positive (in relation to the lower - according to the circuit - the network wire) voltage, and after releasing it, it is discharged through the windings of the relay K1 connected in series. As a result, it works, and its contacts K.1.2 connect the load to the network. and K1.1 prepare the device for shutdown. The resistors of the divider R1 R2 are selected in such a way that the amplitude of the voltage rectified by the VD2 diode on the capacitor C1 does not exceed 40 V.
To disconnect the load from the network, press the same button SB1. In this case, the capacitor C1 is charged through the resistor R1 and the diode VD1 (now with a negative voltage), and when it is released, it is discharged through the relay windings, switching it to its original state.
The device uses a polarized relay RPS-20 (passport RS4.521.757). The non-polar capacitor C1 is composed of two non-polar capacitors K50-6 connected in series with a capacity of 10 μF (nominal voltage 25 V). In the absence of such capacitors, two back-to-back polar ones (10 MKFH50 V) can be used.
The switch does not require adjustment. However, it should be noted that when the switched device is disconnected using the power cord, relay K1 remains in the state in which it was before (there is no automatic reset).
Author: I. Bushuev; Publication: N. Bolshakov, rf.atnn.ru
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