Triac Schematics - Phase Control SCR TRIAC phase control and is very similar to a DC signal available SCR AC phase signal and the pulse wave signal to trigger, except those who are negative voltage V T1-T2, you can still trigger TRIAC. Two-conducting thyristor TRIAC BTA216, the positive and negative half-cycle can trigger can be used as a full-wave power control purposes, in addition to the advantages of having a SCR TRIAC therefore, more convenient AC power control. Figure 5 (a) for the phase control circuit TRIAC SCR BTA316, only the appropriate adjustments RC time constant can change the excitation angle; Fig. 5 (b), 5 (c) are the excitation angle of 30 degrees when the VT1 -T2 and load voltage waveform, generally beyond the control of the load than TRIAC SCR small, generally speaking about 600V, 40A or less. Way thyristor trigger characteristic test for larger power SCR turn-on voltage drop due to a larger holding current difficult to maintain, causing poor conduction state, you should at the SCR anode (A) on A dry cells connected in series, as shown in Figure 3 (b) for testing the circuit shown in order to avoid false positives. For high-power SCR should be on the circuit of Figure 3 (b) of the previous section and then string batteries, so test the effect is obvious. Generally in the following way thyristor 10A test with Figure 3 (a) coupling circuit shown; 10A with an SCR 100A Figure 3 (b) connecting the circuit shown, more than one-way controlled test 100A Silicon should figure 3 (b) on a string and then dry. On the basis of the test SCR BTA208 way thyristor on, for other types of thyristors, according to its basic structure, can also be used to test SCR BTA208_ multimeter positive Wo Electronics (certified) _ controllable Silicon is provided by Dongguan City is fertile Electronic Technology Co., Dongguan City is Wal-Electronic Technology Co., Ltd. (www.dgmydz.com) (www.dgmydz.com) is Dongguan, FET leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum limits to meet customer needs. Wal-electronics leader in the positive with the staff warmly welcome all inquiries negotiations to create a positive future Wal-electron better.