Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1989-05-11
1990-03-06
Salce, Patrick R.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 97, H02M 112
Patent
active
049071459
ABSTRACT:
In the sine wave inverter disclosed herein the input of a low pass filter is switched at high frequency between positive and negative supply voltages. The switching is controlled by a comparator which is responsive to a composite of signals which include contributions from a sine wave control signal at the same frequency desired for the output and a square wave control signal which is at a frequency substantially higher than the desired output frequency. The filter input voltage is attenuated and phase adjusted to generate a feedback signal having a high frequency component which is substantially in phase with the high frequency control signal. This feedback signal is combined with the sine wave and high frequency square wave control signals to generate the composite of signals which controls the comparator. Accordingly, the duty cycle of the filter input voltage is varied in correspondence with both the sine wave control signal and the loading of the inverter output.
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patent: 4706180 (1987-11-01), Wills
Belmont Instrument Corporation
Neuner George W.
Pahl Jr. Henry D.
Salce Patrick R.
Sterrett Jeffrey
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