Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1992-05-05
1994-12-13
Stephan, Steven L.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 97, 323361, H02M 112
Patent
active
053734335
ABSTRACT:
A power inverter formed by several transformers having their secondary windings wired in series and their primary windings connected to respective switching bridges. The turns ratios of each of the primary windings vary from each other by a factor of 3 to provide good voltage resolution over a wide dynamic range. The switching bridges are controlled by a decoder and timing circuit which is, in turn, controlled by a microprocessor. The microprocessor closes the switches in the switching bridges in up to 27 different combinations to produce 27 different output voltages, thereby generating a relatively accurate replica of a sine wave. Voltage regulation is accomplished by sampling the A.C. voltage, comparing the magnitude of the A.C. voltage to a reference voltage, and adjusting the selection of output voltage values so that the A.C. voltage matches the reference voltage. The switching bridge may also be controlled to convert an A.C. voltage applied to the transformer secondaries to a D.C. voltage for battery charging purposes.
REFERENCES:
patent: 3491282 (1970-01-01), Heinrich et al.
patent: 3628123 (1971-12-01), Rosa et al.
patent: 3648149 (1972-03-01), Brown et al.
patent: 4366532 (1982-12-01), Rosa et al.
Sequence Amplitude Modulated Inverters; J. W. Bates; Abstract PESC 73 Record, pp. 222-228.
Berhane Adolf
Stephan Steven L.
Trace Engineering
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