How to protect the remote control switch circuit
add time：2015-05-14
Author：本站
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Actually life experience of people generally know how to protect the remote control switch closed circuit, the general is through current and voltage protection remote control switch. DC cover path, is remote control switch in the power path, in order to cover mobilize tube is pathway short circuit, DC increases had not been burnt. The fundamental way is that when the input DC power exceeds a certain value, mobilize the tube is reverse bias bias form, thus closing, initiative to cut off the channel DC. A DC path cover transistor BG2 and R4 R5, pressure resistance. Pathway deformity tasks, after R4 and R5 pressure, making BG2 emission pole flood level than the base flood level is high, emitter junction accept reverse voltage. In addition BG2 is off form, did not respond to the regulated pathway.
Through the voltage protection pathway of remote control switch, control switch regulator for switching power supply over voltage protection include output over voltage protection, input over-voltage protection. If voltage switch regulator by the use of non regulated current source (such as batteries and the whole group) if too high, will lead to switch regulators failed to deformity tasks, even external mechanical protection and power switch is use of redundant output over voltage protection pathway. Consisting of a crystalline body tube and a relay protection pathway, is in this pathway, when the output current source voltage is higher than the breakdown voltage of the zener diode value breakdown voltage regulator tube, a current flows through a resistor R, the crystallization of T-tube conduction and relay initiatives, the normally closed contact of the cut, cut off the output. Power output polarity protection pathway to output over voltage protection is combined together to form polarity protection screening and overvoltage protection pathway.
In fact, through continuous learning is how to better protect the remote control switch circuit, there are certain benefits to everyone.