![]() ![]() ![]() During ωt =π to ωt=2π, the SCR T2 is in reverse bias if the source voltage is more than the E.The output voltage across the load becomes zero at ωt=π because of the conduction of the freewheeling diode.In this condition, the load current io flow from T1D1 to FD. The reversal of supply voltage causes forward biasing of a free-wheeling diode(FD).The anode of SCR T 1 receives a negative supply at its anode and it goes into the off state. The supply voltage reverses and becomes negative just after ωt=π.The output voltage at the load terminal during ωt=α to ωt=π is just a replica of the source voltage(V S).The thyristor T1 switches off during ωt =π to ωt=2π because of the negative voltage at its anode. Under this condition, the SCR T1 conducts if Vmsinα > E, and the load current io flows through the RLE load through thyristor T1 and diode D1. The SCR T1 conducts from ωt =α to ωt=π. After ωt=0, SCR T 1 becomes forward biased provided V msinωt is greater than the load circuit emf E.During this period the SCR T 1 and diode D 1 come into conduction mode. During the interval of ωt =0 to ωt=α, SCR T 1 can be switched on by applying the firing pulse to its gate.The operation of a single-phase semi-converter from o to π and π to 2π time duration is as follows. The figure below shows the waveform of a single-phase half-controlled converter. The freewheeling diode freewheels the energy stored in the inductor and, thus limits the overvoltage. Thus, this bridge circuit is the main circuit of the semi converter.Ī free-wheeling diode (FD) has its connection in parallel with the load and bridge circuit. And, finally, the bridge circuit has a parallel connection with the RL circuit. Pair of a diode and SCR( D2, T1) is connected in the parallel with another pair of a diode and SCR(D1, T2). The bridge circuit of the semi converter has two diodes (D1, D2) and two SCRs(T1, T2). The figure below shows the circuit diagram of single-phase semi-converter bridge circuit. Circuit Diagram of Single Phase Semi Converter In this article, we will discuss in detail the single-phase semi-converter, its working, operation, average & RMS output voltage. As its name suggests, the semiconductor has semi or limited control over the DC output voltage. ![]() A single-phase semi-converter has two SCRs and two diodes. We also call this a half-controlled converter. Single Phase Semi Converter converts AC voltage into DC voltage in a controlled manner. ![]()
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