Single phase half wave controlled rectifierpdf rectifier power. Firas obeidat faculty of engineering philadelphia university controlled three phase half wave rectifiers the thyristor will conduct on state, when the anodetocathode voltage is positive and a firing current pulse is applied to the gate terminal. The word controlled means that, we can change the starting point of load current by controlling the firing angle of scr. To control the load voltage, the half wave rectifier uses three, commoncathode thyristor arrangement. Single phase half wave controlled rectifier, as the name suggests, is a rectifier circuit which converts ac input into dc output only for positive half cycle of the ac input supply. As for the half wave 3phase uncontrolled diode rectifier, the load is connected between the converter positive terminal cathodes of all thyristors and the supply. Scrs are very useful in ac circuits where they may serve as rectifiers whose output current can be controlled by controlling the gate. Nevertheless, singlephase rectifiers are still in use both as lowpower standalone converters up to. Half wave controlled rectifiers with a resistive load. In half wave rectifier only half cycle of applied ac voltage is used.
Looking at the piv of the diodes, vs is the highest voltage seen by each diode in its. Singlephase half wave controlled rectifier with inductive load when the supply voltage reverse, the thyristor is kept conducting due to the fact that current through the inductance cannot be reduced to zero. Lecture notes on power electronics veer surendra sai. Half controlled and fully controlled bridge circuits, different waveforms, input line current harmonics, power factor, current distortion and displacement factors inverter mode of operation. The singlephase halfwave controlled rectifier uses a single thyristor with a load and also the output voltage and current waveform as shown in figure 1. Three phase controlled rectifiers philadelphia university.
Single phase half wave controlled rectifier electrical. Waveforms of the singlephase, doubleway, fullwave bridge rectifier. Figure 1a shows a half wave controlled rectifier circuit with a resistive load. Another half cycle of ac voltage negative cycle is not used. Pdf experiment to familiarize with the scr in controlled. Controlled rectifier an overview sciencedirect topics. The power diode in a half wave rectifier circuit passes just one half of each. During the positive half cycle of the supply voltage, the scr is forwardbiased and will conduct if a trigger is applied to the gate. In half wave single phase controlled rectifier only one scr is employed in the. During negative voltage half cycle, current continuous to. Simulation result of single phase semi converter with rl load using free.
1410 1527 1526 1058 1477 143 520 325 229 1054 1071 1254 674 1197 1213 1191 1383 49 1166 78 1303 1048 913 157 475 1143 178 1020 225 847 813 1289 441 683 906 302 770 1024 78 1291