Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1991-11-12
1994-05-03
Stephan, Steven L.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 98, 363132, H02M 7525
Patent
active
053093453
ABSTRACT:
An invertor device for an AC power unit. In one form of the invention, a sine wave signal having a predetermined frequency is superposed on a triangular wave signal having a frequency higher than the predetermined frequency to form a superposed signal. A pulse width modulating circuit having a predetermined fixed threshold level amplifies the superposed signal with reference to the predetermined fixed threshold level to generate a pulse width modulalted signal. A switching device performs switching control of an output from a DC power source circuit based on the pulse width modulated signal to output an AC power having the predetermined frequency via an output circuit. In another form of the invention, a difference between waveforms of output AC voltages appearing at output terminals of the output circuit is detected to generate a signal representing the difference. The sine wave signal is corrected by the use of the signal representing the difference and the corrected sine wave signal is used in forming the pulse width modulated signal. Alternatively, a difference between voltages of switched outputs from the switching device which are transmitted to the output circuit by a pair of output lines is detected to generate a signal representing the difference for use in correcting the sine wave signal. In another form of the invention, the sine wave signal is additionally corrected by the use of DC offset components taken out from the signal representing the difference.
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Nakamura Masashi
Shimizu Motohiro
Berhane Adolf
Honda Giken Kogyo Kabushiki Kaisha
Stephan Steven L.
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