Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1978-02-16
1980-11-11
Miller, J. D.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 97, 363134, H02P 1318
Patent
active
042336589
ABSTRACT:
A self-balancing d-c/a-c converter comprises a transformer whose primary winding is split into a pair of symmetrical halves each connected in series with a respective transistor and an associated resistor across a supply of direct current. A differential amplifier, with inputs connected across the two resistors through a pair of low-pass filters, generates an unbalance signal d in the form of a voltage of either polarity which is additively and subtractively superimposed upon a reference voltage e to provide two control signals e+d and e-d fed to respective inputs of two comparators. Two synchronized signal generators produce a sawtooth oscillation a and a square wave f, the latter having a period which is twice that of the former. Sawtooth wave a is fed in parallel to the other inputs of the two comparators while the square wave f and its complement g alternately unblock a pair of AND gates in cascade with these comparators. Two resulting pulse trains h and i, of a pulse width varying with the sign and magnitude of the unbalance signal d, energize the bases of the two transistors in a manner tending to rebalance the current traversing the transformer primary.
REFERENCES:
patent: 3657631 (1972-04-01), Martens et al.
patent: 3859583 (1975-01-01), Reed
patent: 3870943 (1975-03-01), Weischedel et al.
patent: 3873903 (1975-03-01), Koetsch et al.
patent: 3916282 (1975-10-01), Rothermel
Lupatin Elio
Rizzi Luigi
Miller J. D.
Ross Karl F.
Societa Italiana Telecomunicazioni Siemens S.p.A.
Wong Peter S.
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