Brightness control in a floor lamp. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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The circuit diagram of the regulator is shown in the figure. Its key element is the thyristor VS1, the turn-on phase of which in each half-cycle depends on the time constant of the circuit (R1 + R2) C1.
The device allows you to change the brightness of a lamp with a power of up to 200 watts over a wide range. In general, its load can be any device of appropriate power that does not contain any noticeable inductance: a soldering iron, a boiler, etc.
If the KTs405A diode bridge is replaced with another one with high operating currents, then the load can be increased, in the limit - up to 2 kW. In this case, the thyristor and bridge diodes will need to be placed on heat sinks.
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