The most basic use of ordinary crystal gates is to be controllable. The diode rectifier circuit belongs to an uncontrollable rectifier circuit. If the diode is converted to a thyristor, it can constitute a controllable rectifier circuit. Take the simplest single-phase half-wave controllable rectifying circuit as an example, during the positive half period of the sinusoidal AC voltage U2, if the VS control is extremely no input trigger pulse UG, VS still cannot be turned on, only in U2 is in the neighborhood, When the control is applied to the trigger pulse UG, the thyristor is triggered. Picture of its waveform (C) and (D), only the voltage UL output is available on the load RL only when the trigger pulse UG arrives. Ug arrived early, the thyristor turned on time; UG came late, the thyristor turned on the time. By changing the temperature of the pulse UG arriving on the control, the average value UL of the output voltage on the load can be adjusted.

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