What SCR in the circuit main purpose is? Common basic purpose is controllable thyristor rectifier. Familiar diode rectifier circuit are not controlled rectifier circuit. If the diode into SCR, can constitute a controlled rectifier circuit. Now I draw a simple single-phase half-wave controlled rectifier circuit]. Sinusoidal AC voltage U2 during the positive half cycle, if there is no input VS of the gate trigger pulse Ug, VS is still not turned on SCR 2P4M, U2 is only in the positive half cycle, when the gate trigger pulse is applied Ug, SCR is triggered conduction. Now, draw its waveform chart, you can see SCR 2P6M, only when the trigger pulse arrival Ug SCR, the load RL have UL output voltage (waveform chart shaded area). In the bridge rectifier circuit, the diodes are replaced by the SCR is not controlled rectifier circuit became of it? SCR C106M in bridge rectifier circuit, just need to be replaced two diodes on SCR can constitute a full-wave controlled rectifier circuit. Now draw the circuit and waveforms (Figure 5), the thyristor controlled Nengkanmingbai very desired trigger pulse is how to generate it? SCR trigger circuit in the form of many commonly used RC-bridge phase-shift trigger circuit, single-junction transistor trigger circuit, transistor trigger circuit, using a small SCR trigger large SCR trigger circuit, etc. SCR BTA140 | SCR | are fertile electrons from Dongguan City is fertile Electronic Technology Co., The company offers. Dongguan City is Wal-Electronic Technology Co., Ltd. (www.dgmydz.com) (www.dgmydz.com) strong, credible, FET and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the electronics are fertile and you hand into the brilliant, for a better future!