thyristor KP KK 1800A 2500A for sale

Ordinary thyristor is the most basic use of controllable rectifier. We are familiar with the diode rectifier circuit is uncontrollable rectifier circuit. If the diode into a thyristor, you can constitute a controllable rectifier circuit. In the simplest single-phase half-wave controllable rectifier circuit, for example, during the positive half cycle of the sinusoidal AC voltage U2, if the VS control electrode does not have the input trigger Ug, VS still can not turn on, only if U2 is in positive half When the control electrode exits the trigger pulse Ug, the thyristor is triggered to turn on. Draws its waveforms (c) and (d), only when the trigger pulse Ug arrives, the load RL has a voltage UL output. Ug came early, the thyristor turns on the time; Ug to come late, the thyristor turns on the time later. By changing the timing of the trigger pulse Ug on the control pole, the average value of the output voltage on the load can be adjusted. In the electrical technology, often the half cycle of alternating current as 180 °, known as the electrical angle. In this way, the electrical angle experienced from the beginning of the zero value to the instantaneous arrival of the trigger pulse is called the control angle α in each positive half of U2; the electrical angle turned on by the thyristor in each positive half is called the conduction angle θ. It is clear that both α and θ are used to represent the thyristor in a half cycle of the forward voltage withstand the conduction or blocking range. By changing the control angle α or conduction angle θ, change the average value of the pulse DC voltage on the load UL, to achieve a controlled rectifier.

1: low-power plastic two-way thyristor is commonly used as sound and light control lighting system. Rated current: IA less than 2A.

2: large; medium power plastic and iron-sealed SCR is usually used as power-type controllable voltage regulator circuit. Like a variable voltage output DC power supply and so on.

3: high-power high-frequency SCR is usually used in industry; high-frequency melting furnace.