One button load control device. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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One button load control device. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches

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To control the switching on and off of the load from various places, the device shown in the figure is proposed.

One button load control device

When one of the buttons SB1 ... SBn is pressed, a positive pulse is supplied to the control electrode of the thyristor VS1 through the resistor R1. The thyristor VS1 opens and the magnetic starter KM1 is turned on, which, with its contacts KM1.1 ... KM1.3, turns on the load, and the contacts KM 1.4 prepare the switching circuit of the thyristor VS1. When you next press any of the buttons SB1...SBn, the voltage from the charged capacitor C2 is applied to the thyristor VS1 in reverse polarity, which closes and turns off the magnetic starter. When you next press one of the SB1...SBn buttons, the starter will turn on again and turn on the load.

This device can be used both to control electric motors and to control lighting.

Resistor R2 type PEV-7,5 200 Ohm, you can use two MLT-2 430 Ohm resistors connected in parallel.

Capacitor C1 20 uF 450 V, C2 -0,1 uF 400V.

Author: V. Yakovlev, UT5WK, Shostka

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