Thyristor rectifier, based on thyristor (power electronic power supply), uses intelligent digital control circuit as the core power supply control device. It has the advantages of high efficiency, no mechanical noise and wear, fast response speed, small size and light weight.
Thyristor is the abbreviation of thyristor, also known as silicon controlled rectifier (SCR). Because of its high voltage and current capability, it is still the highest among power electronic equipment, and its work is reliable, so it still has a more important position in the application of large capacity.
The characteristics of the silicon controlled rectifier: it is explosive. However, if the anode or control rod is coupled with a reverse voltage, the thyristor cannot be guided. The joystick is used as a forward trigger for SCR guidance, but it cannot be closed. So, what method can be used to turn off the thyristor? Turn off the thyristor, disconnect the anode power supply or the minimum anode current (called maintenance current). If the SCR anode and cathode are combined with AC voltage or pulsed DC voltage, the thyristor will automatically shut down when the voltage is greater than zero.
It is often said that this is composed of four layers of semiconductor material, with three pn junctions, and three electrodes on the outside. The first layer of P-type semiconductor electrode is called the anode, and a layer of 3 P-type semiconductor lead electrodes is called the control G layer 4 N-type semiconductor The lead electrode is the cathode K. The symbol can be seen in the thyristor circuit, it is a single direction and diode conductive device, the key is a control G, which makes it have a completely different working characteristics from the diode