Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1987-02-13
1988-04-12
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
331112, 363131, H02M 3338
Patent
active
047378980
ABSTRACT:
A transistor oscillator produces at the secondary winding of a transformer output pulses with a pulse width which is dependent upon stored charge in the base of the transistor, the collector-emitter path being connected in series with a primary winding of the transformer and a feedback winding being connected via a capacitive feedback path to the base. The output pulses are rectified and smoothed to produce an output voltage. Regulation of the output voltage is achieved either by a zener diode connected at the output or by reducing the stored charge in the base with a control transistor, which may be a photo-transistor for electrical isolation of the output, whose collector-emitter path is connected in parallel with the base-emitter path of the oscillator transistor.
REFERENCES:
patent: 3300705 (1967-01-01), Hunstad
patent: 3743918 (1973-07-01), Maitre
patent: 4385347 (1983-05-01), Takematsu
Beha Jr. William H.
Haley R. John
Northern Telecom Limited
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