WS-101D bridgeless rectifier circuit

The WS-101D bridgeless rectifier circuit is as shown in the figure. When S2 is the weak gear, VD1 is used for half-wave rectification , and the half-wave pulsating DC voltage is added to the spectrum pole . When S2 is in the strong position, the thyristor is turned on, and the voltage applied to the RL spectrum generator is AC 220V. The spectrum generator is composed of two spectrum tubes with a DC resistance of 360Ω connected in parallel. WS-301C uses the same spectrum generator as WS-101D. It has no silicon- controlled control circuit and is a general switching circuit.