Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1983-07-19
1986-04-29
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323901, G05F 156
Patent
active
045859884
ABSTRACT:
A control transistor (Q.sub.2) is connected between a base and an emitter of a switching transistor (Q.sub.1) for by-passing a base current of the switching transistor (Q.sub.1). In a transitional period immediately after application of an input voltage, a time-constant circuit (R.sub.8, R.sub.9, R.sub.10, R.sub.11, C.sub.4), which is connected to a base of the control transistor (Q.sub.2) through a diode (D.sub.5), supplies the base of the control transistor (Q.sub.2) with a voltage lower than the output voltage. Therefore, the control transistor (Q.sub.2) is turned ON immediately after the application of the input voltage to by-pass the base current of the switching transistor (Q.sub.2), whereby the switching transistor (Q.sub.1) is forced to be turned OFF. The switching transistor (Q.sub.1) is turned ON again by self-excitation and then is at once made to be turned OFF again by the effect of the time-constant circuit (R.sub.8, R.sub.9, R.sub.10, R.sub.11, C.sub.4). Such operation is repeated until the voltage at the output point (B) is increased as large as a predetermined voltage value.
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Jones Judson H.
Sanyo Electric Co,. Ltd.
Wong Peter S.
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