Protection Circuit of Transistor Regulating Power Supply

Published:2011/7/17 7:16:00 Author:Michel | Keyword: Regulating Power Supply, Protection Circuit | From:SeekIC

a、b、c、d、e are protection circuits of transistor regulating power supply.The voltage stabilizer load protection circuit has current limiting type and current cut-off type. In the picture,(a)~(d) are current limiting protection circuit.In the picture 1,VT1 base of electricity flows through VT1 VD1 and VD2 circulation when the voltage drop is more than VD1 Rs and VD2 positive voltage.Therefore, its emitter current is restricted and it uses the sharp increasing characteristics of diode forward voltage current.In figure (b) and (c),transistor UEB which has the same characteristics as diode,the VT3 UBE is controlled by testing voltage drop on RS to limit the VT1 emitter current and the limited current I. = 0.6 V/Rs.



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