Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1981-08-25
1983-12-13
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
323288, 323289, H02P 1322, H02P 1330
Patent
active
044208049
ABSTRACT:
A control circuit for a main switching transistor in a switching regulator, wherein PWM pulses are produced by varying a DC bias of triangular-wave pulses in response to a detected error signal, and which pulses are provided as a control signal for switching on and off the main switching transistor. In order to reduce power dissipation due to carrier storage at each turn-off operation of the switching transistor, a negative voltage potential is produced by a diode and a capacitor from square-wave pulses of a constant repetition frequency from which pulses the triangular-wave pulses are formed, and is applied to an emitter of an NPN transistor which operates as a variable impedance circuit for varying the DC bias of the triangular-wave pulses in response to the error signal, so that the triangular-wave pulses are biased to a negative voltage potential. Therefore, the base of the switching transistor rapidly drops down to a negative voltage potential at the time of each turn-off operation of the switching transistor, so that the stored carrier is rapidly drawn out of the base of the switching transistor.
REFERENCES:
patent: 4005317 (1977-01-01), Hinrichs
patent: 4312029 (1982-01-01), Zellmer
Beha Jr. William H.
Tohoku Metal Industries Ltd.
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