DC/AC converter with equally loaded switches

Electric power conversion systems – Current conversion – Using semiconductor-type converter

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Details

363 98, H02M 75387

Patent

active

057197598

ABSTRACT:
A circuit arrangement comprises an inverter with two parallel switching branches which are connected to a DC voltage source and each of which comprises two series-connected switching members, each of which comprises at least one switch and an anti-parallel connected diode. A switching member in one switching branch each time constitutes a diagonal pair in conjunction with a switching member in the other switching branch. A load with a given polarity is connectable to a DC voltage source via the diagonal pair. The voltage on the load temporarily becomes zero upon the change-over from one polarity to the other. A control circuit is provided for opening and closing the switches in a manner such that the switching members are successively switched on and off. The switching members are more uniformly stressed because the control circuit is constructed so that all of the switching members are successively switched on as the second switching member in their diagonal pair or all of the switching members are successively switched off as the second switching member in their diagonal pair.

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"Power Electronics", N. Mohan, T.m. Undeland, Wp. P. Robbins, Dec. 1989, John Wiley & Sons, p. 123.

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