SCR principle When the anode A side with a positive voltage, BG1 and BG2 tube pipe are in the enlarged state, this time, from the control electrode G a positive trigger signal input, BG2 tube there ib2 base current flows before, the current flowing through the pipe to the collector BG2 SCR C106G, enlarged to ic2, ic2 = β2ib2, ic2 along the circuit flow to the base BG1 tube pole, so there ib1 = ic2, flows through BG1 tube, arriving at the collector SCR, current becomes ic1, ic1 = β1ib1 = β1β2ib2, this current also flows back BG2 base, making ib2 increased to ib2 = ic1, thus forming a positive feedback loop so that the current surge, it reaches saturation SCR state and conduction. SCR is turned on and off only two states, with the switching characteristics, changing its status there are some prerequisites. Transition from the off state to a conduction state, the anode potential is always higher than required to meet the cathode potential, and the control electrode have sufficient forward voltage and current; while maintaining the conductive state, must satisfy the anode potential is higher than the cathode potential, and anode current is greater than maintaining the current; transition from conduction state to the OFF state, the need to meet the anode potential is lower than the cathode potential, or anode current is less than the holding current. SCR is used as the role of non-contact switch SCR BTA412Y, frequently used in automation equipment, instead of general purpose relays, with no noise, long life. Three thyristor switch is to play the role and the role of the regulator, often applied to the AC circuit, which is triggered at different times due to SCR 2P6M, so that only a portion of it by the alternating current cycle, through its voltage is only part of the full voltage, and thus play a role in regulating the output voltage. SCR BTA204, SCR, 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_44844630.html), for more information about the company.