SCR basic voltage characteristic since the voltage rises to J2 junction avalanche breakdown voltage of the thyristor after, J2 junction avalanche multiplication occurs, generating a large number of electrons and holes in the junction region, the N1 region electrons, holes When the P2 area. N1 electrons into the region by the P1 region and the junction J1 through N1 injection hole recombination zone, also, into the cavity by N2 and P2 region of the junction J3 region by injecting electrons into the P2 region of the composite, avalanche breakdown, N1 enters zone Electronic and holes into the P2 region of each compound can not be fully off, so that there is the accumulation of electrons in the N1 region, there is a hole accumulation in the P2 region SCR BTA216, resulting in increased potential of P2 region, the potential of N1 zone decline, J2 junction becomes forward biased, as long as the current slightly increases, the voltage will drop rapidly, the so-called negative resistance characteristics, then J1, J2, J3 three junctions are in the forward-biased, the SCR will go forward conducting state - --state, then SCR BTA208, its characteristics and general characteristics of PN junction forward similar SCR What is the purpose in the circuit is Ug coming early, SCR conduction time to early? ; Ug late arrival, SCR conduction time later. By changing the time of the trigger pulse control on arrival Ug pole, you can adjust the output voltage on the load average UL (the size of the shaded area). In electrical technology, often alternating current half cycle for 180 °, called the electrical angle. Thus, at each positive half cycle of U2, starts from a zero value to the electrical angle of the trigger pulse arrives moment experienced by known control angle α; at each positive half-cycle of the electrical angle thyristor conduction angle called θ. Obviously SCR BTA312, α and θ are used to denote the thyristor conduction or blocking withstand voltage of the positive half cycle of. By changing the control angle α or conduction angle θ, change pulsed DC voltage across the load average of UL, to achieve a controlled rectifier. SCR SCR _ BTA204_ 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!