PWM, Single-ended, separately driven d.c.-d.c. converter

Details PWM, Single-ended, separately driven d.c.-d.c. converter PWM, Single-ended, separately driven d.c.-d.c. converter

1982-01-28

1984-03-27

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

340663, 363 56, H02P 1322

Patent

active

044398204

ABSTRACT:
The rectified output voltage of the transformer of a d.c. to d.c. converter, as represented by a voltage divider output, is compared with a reference voltage in a voltage regulator (15), the output of which is compared in a comparator (29) with a sawtooth wave to produce a sequence of pulses the duration of which depends upon the output voltage of the regulator. These pulses are provided to the transformer through a driver circuit capable of operating at a very low input voltage. One flank of the square wave produced by a component of the sawtooth wave generator is differentiated by a capacitor (39) to provide transient pulses to the transformer to keep it operating in the event the input voltage to the converter exceeds the output voltage. Another comparator (59) is provided to shut down comparator operation when there is a short circuit at the output and also for a brief start-up interval during which capacitors are charged up.

REFERENCES:
patent: 3670234 (1972-06-01), Joyce
patent: 4099068 (1978-07-01), Kobayashi et al.
patent: 4301497 (1981-11-01), Johari

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