Single-phase half-wave resistance-capacitance phase-shift trigger circuit

By adjusting the potentiometer RP, the phase of the diagonal output voltage "oD of the phase-shift bridge changes accordingly,
so the rectified power obtained by the load Rfz also changes accordingly. The waveforms at each point are shown in Figure 16-1 (b).
    In the figure, R is the current limiting resistor to limit the current of the control electrode of the thyristor V; the diodes VDi and VDz are used to protect the control
electrode from breakdown due to excessive reverse voltage.