Regulated transistorized DC to DC converter and parallel operati

Electricity: power supply or regulation systems – Remote sensing

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321 18, 321 27R, 323 22T, H02M 3335

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active

039477479

ABSTRACT:
Various types of static DC to DC converters are known. Some of these have output rectifiers including phase controlled SCRs. The present invention eliminates the need for controlled output SCRs by pulse width modulation of switching elements in a control circuit controlling the converter circuitry itself. This results in the elimination of some switching devices, higher reliability and higher-efficiency, A unijunction oscillator drives a one-shot multivibrator and a flip flop. The unijunction oscillator, one-shot multivibrator and flip flop feed two AND gates which are alternately enabled to allow pulses of current to flow from a DC source through opposite halves of a primary winding of a transformer. The output of the secondary winding is rectified and filtered to provide the converter output. Voltage regulation is accomplished by controlling the one-shot multivibrator. In one embodiment, paralleling of a number of converters is enabled by providing for frequency and pulse width synchronization.

REFERENCES:
patent: 3670234 (1972-06-01), Joyce
patent: 3737756 (1973-06-01), Hasley et al.
patent: 3769568 (1973-10-01), Hamiton et al.
patent: 3838329 (1974-09-01), Michelet et al.
patent: 3859586 (1975-01-01), Wadlington
patent: 3909695 (1975-09-01), Peck

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