Electric power conversion systems – Current conversion – With means to selectively provide d.c. of either polarity
Patent
1983-01-14
1985-01-15
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to selectively provide d.c. of either polarity
340645, 363 54, 363 87, 363129, H02M 108
Patent
active
044941820
ABSTRACT:
A method and apparatus for use in conjunction with a power conversion system employing a plurality of switching elements for controlling the electrical power supplied to a load from a source includes the sensing of the instantaneous voltage furnished to the load and providing a signal representing the time derivative of the sensed voltage. The derivative signal thus developed is compared with predetermined reference values to develop output signals which are logically combined to provide a final signal representative of the instant in time at which one of the switching elements is commutated (turned off).
REFERENCES:
patent: 3654541 (1972-04-01), Kelley et al.
patent: 3806906 (1974-04-01), Young
patent: 3865438 (1975-02-01), Boksjo et al.
patent: 4167698 (1979-09-01), Podlewski
Arrillaga et al., "Fast ON/OFF Detection of Silicon-Controlled Rectifiers and Its Influence on Convertor Controllability," IEEE Trans. on Ind. Electr. and Contr. Instr., vol. IECI-26, No. 1, pp. 22-26, (Feb. 1979).
Beha Jr. William H.
General Electric Company
Renner Arnold E.
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