Triac Schematics - phase control TRIAC phase control thyristor SCR is very similar, available DC signal, AC phase signal and the pulse wave signal to trigger, except those who are negative voltage V T1-T2, you can still trigger TRIAC. TRIAC can double conduction, in the positive and negative half-cycle can trigger can be used as a full-wave power control purposes SCR 2P4M, in addition to the advantages of having a SCR TRIAC therefore, more convenient AC power control. Figure 5 (a) for the TRIAC phase control circuit, only the appropriate adjustment to change the RC time constant of the excitation angle; Fig. 5 (b), 5 (c) are the excitation angle VT1-T2 and a load of 30 degrees The voltage waveform, generally beyond the control of the load than TRIAC SCR small, in general terms about 600V, 40A or less. Triac Schematics - works when the anode A with a positive voltage, BG1 and BG2 tubes are in the enlarged state. At this point, if a positive trigger signal input from the control electrode G, BG2 there ib2 base flow flowing through BG2 zoom SCR T405-600T, its collector current ic2 = β2ib2. Because direct collector electrode connected BG2 and BG1 base, so ib1 = ic. At this point SCR T405-800T, then by current ic2 BG1 zoom, so BG1 collector current of ic1 = β1ib1 = β1β2ib2. This current also flows back BG2 base, table positive feedback, so ib2 increasing, so the results of the positive feed cycle, two tubes of current surge, SCR so saturated conduction. SCR SCR _ 2P4M_ are fertile Electronics Dongguan City is provided by Wal-Electronic Technology Co., Ltd .. 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! You can also access (www.dgmydz.com/supply_details_48127415.html), for more information about the company.