Schematic diagram of half controlled rectifier resistor load with freewheeling diode
Basic working principle
When the positive half cycle of U2, when wt = α, the thyristor module VT1 is triggered to turn on, and the current is transmitted from the positive end of U2 - vt1-r-vd4-u2 load to the load.
When U2 is zero crossing and becomes negative, the load current passes through the freewheeling diode, so that the DC output of the bridge circuit has only a voltage drop of 1V, which reduces the current in the thyristor module diode series connection line to below the maintenance current, so that the thyristor module can be disconnected, and there can be no out of control.
When the negative cycle of U2 is wt = π + α, VT3 will be triggered to turn on. Then VT1 will receive back voltage and be disconnected, and U2 will send power to the load through vt3-r-vd2-u2.
When U2 zero crossing timing, the load current passes through the freewheeling diode, so that the DC output of the bridge circuit has only a voltage drop of 1V, which reduces the current in the thyristor module diode series circuit to below the maintenance current, so that the thyristor module is disconnected, and the above process is repeated.
The above is the explanation of single-phase semi controlled rectifier bridge with freewheeling diode by the rectifier module manufacturer semipower. semipower a power semiconductor power module supplier with power electronics technology as its professional field. It provides the formulation, production and processing of semiconductor power modules for enterprises and companies. In addition, it also provides the processing business of supplied materials or OEM for companies . The main products are: IGBT module, thyristor module (SCR) module, ultra fast recovery epitaxial diode module, single-phase rectifier bridge module, three-phase rectifier bridge module, rectifier diode module, Schottky diode component power module and other power semiconductor electronic components.
