Control systems for pulse width control type inverter

Electric power conversion systems – Phase conversion without intermediate conversion to d.c. – By dynamoelectric machine converter

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328 58, 363 41, 363 43, H02M 700

Patent

active

041662474

ABSTRACT:
A control system for controlling the conduction period of the switching elements of a pulse width control type inverter is provided having a reference pulse generator that determines the output frequency of the inverter output voltage, a constant voltage control circuit for generating an analogue output voltage, an A-D converter for converting the analogue output voltage into a digital output signal and a up-counter which counts clock pulses. The outputs of the up-counter and the A-D converter are compared with each other by a digital comparator. The up-counter is cleared by the reference pulse when another up counter counts a predetermined number of output pulses from the comparator. The up-counter repeats a predetermined number of counting up and clearing operations until it produces a carry signal, and the conduction period of the switching element is determined by an interval between the generation of the reference signal and the generation of the carry signal. In a modified embodiment the up-counter is substituted by a down counter.

REFERENCES:
patent: 3609507 (1971-09-01), Beck
patent: 3662247 (1972-05-01), Schieman
patent: 4047058 (1977-09-01), Green
patent: 4075569 (1978-02-01), Wright

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