Method and circuit for generating drive pulses for a DC control

Details Method and circuit for generating drive pulses for a DC control Method and circuit for generating drive pulses for a DC control

1983-06-30

1985-06-11

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 41, 363132, H02P 1318

Patent

active

045232687

ABSTRACT:
Method and circuitry for generating drive pulses for a DC control element of the type having four semiconductor switches arranged in a bridge circuit. Two triangular voltage waveforms are formed and are shifted with respect to one another by a difference voltage. Each bridge branch of the bridge circuit is driven in response to a comparison between the first triangular voltage waveform and a control voltage, and a second semiconductor switch of each bridge branch is driven in response to a comparison of the second triangular voltage waveform and the same control voltage. A pause between the conductive periods of the semiconductor switches within a bridge branch is obtained by driving the semiconductor switches with offset triangular voltage waveforms. The pauses prevent short circuits of a supply voltage source, and their duration is determined by the difference voltage and can therefore be achieved accurately at low cost.

REFERENCES:
patent: 3440566 (1969-04-01), Swanson
patent: 4204266 (1980-05-01), Kammiller et al.
patent: 4314325 (1982-02-01), Siebert
patent: 4424557 (1984-01-01), Steigerwald
"Netzgefuhrte Stromrichter mit Thyristoren", by G. Moltgen, 2nd Ed., pp. 278-279.

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