可控硅的应用方法和用途(国外英文资料).docVIP

可控硅的使用方法和用途(国外英文资料) Silicon controlled silicon (SCR) is widely used in automatic control, control, mechanical and electrical fields, industrial, electrical and household appliances. SCR is an active switching element, it usually keep in non Road, until a little from the control signal to the triggering or ignition the road, once the ignition trigger signal even evacuated it also maintains state road, to make it stop in between the anode and cathode with on the reverse voltage or current through the SCR diode is reduced to a value below. Thyristor diodes can be simulated with two different polarities (P-N-P and N-P-N) transistors, as shown in figure G1. When the gate thyristor is vacant, BG1 and BG2 are in a closed state, the circuit basically no current flows through the load resistance RL, when the gate input a positive pulse voltage when the BG2 channel, the base potential decrease in BG1, so BG1 began, BG1 road makes BG2 the base electrode potential further increased base potential BG1 decreased further after a positive feedback process so that BG1 and BG2 into the saturated channel state. The circuit will soon enter the channel state from the cut-off state, when the gate does not trigger the pulse circuit, because of the role of positive feedback will keep the channel state unchanged. If the anode and cathode with reverse voltage, the BG1 and BG2 are in the state of the reverse bias circuit so quickly as if, also increase the load resistance RL resistance to current reduction of base current BG1 and BG2 will also be reduced, when reduced to a certain value due to the positive feedback circuit. The circuit will soon pass from the state to turn off state, we call the current to maintain the current. In practical applications, a switch can be used to short-circuit the anode and cathode of the controlled silicon so as to achieve the shutdown of the controlled silicon. For example, silicon gate circuit is the most widely used circuit in practical applications. There