H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/55
H02M 1/14 (2006.01) H02M 7/5383 (2006.01)
Patent
CA 1218408
RIPPLE REDUCTION CIRCUIT FOR AN INVERTER Abstract A ripple reduction circuit for an inverter which converts DC power supplied on DC buses into AC power to drive a load includes a sensingtransformer having a primary winding coupled to one of the buses by a switch so that the ripple on the DC bus is sensed. A periodic voltage is impressed across a secondary winding of the sensing trasnsformer due to the sensed ripple and this periodic waveform is coupled to a secondary winding of an output inductor. A primary winding of the output inductor is connected between the output of the inverter and the load. The primary winding of the output inductor receives a first ripplecomponent due to ripple on the DC bus and a second ripple component which opposes the first as a result of the periodic waveform in the secondary winding of the output inductor. The two ripple components substantially cancel one another and hence a low distortion power waveform is delivered to the load.
463506
Riches Mckenzie & Herbert Llp
Sundstrand Corporation
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