Silicon-controlled trigger circuit using positive temperature coefficient thermistor compensation

Abstract

The invention discloses a silicon-controlled trigger circuit using a positive temperature coefficient thermistor compensation, wherein positive temperature coefficient thermistors for compensating a silicon-controlled trigger current are connected in series in a silicon-controlled trigger loop, the positive temperature coefficient characteristic of the thermistors is used to compensate for the characteristic of the trigger current required to conduct the silicon-controlled with temperature; and the positive temperature coefficient thermistors are connected in series to the control electrode ofthe silicon controlled. The invention solves the problems of high temperature false trigger and low temperature un-triggering of a normal signal caused by the temperature drift generated by the silicon controlled due to temperature change, thereby increasing the use temperature range of the silicon controlled, and expanding the selectable range of the trigger current.

Description

technical field [0001] The invention relates to a thyristor trigger circuit, in particular to a thyristor trigger circuit compensated by a positive temperature coefficient thermistor. Background technique [0002] The semiconductor material that constitutes the thyristor is very sensitive to the change of the surrounding temperature, which causes the parameters of the thyristor to change with the change of temperature, among which the trigger current is affected by the temperature, which is particularly noticeable. When the thyristor works at high temperature, the leakage current increases, and at the same time, the lifetime of the minority carrier in the PN junction increases with the increase of temperature, and the amplification factor increases accordingly. The combination of these two points causes the gate trigger current to decrease rapidly with the increase of temperature. , the trigger current at high temperature is much smaller than that at room temperature, and th...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of false triggering and non-triggering caused by the influence of temperature on the trigger current of the thyristor in the prior art, the present invention provides a simple, reliable and low-cost solution: a controllable The silicon trigger circuit, according to the characteristic that the resistance of the positive temperature coefficient thermistor increases linearly with the temperature within a certain temperature range, reduces the current in the trigger circuit at high temperature and increases the current in the trigger circuit at low temperature, thus You can choose a thyristor with a larger trigger current to solve the problem of false triggering of the thyristor at high temperature and non-triggering at low temperature

Images