Power supply and oscillator therefor

H - Electricity – 02 – M

Patent

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331/25, 321/29

H02M 3/338 (2006.01)

Patent

CA 1262259

POWER SUPPLY AND OSCILLATOR THEREFOR Abstract of the Disclosure 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.

529374

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