초록 ▼

A DC to N phase AC converter, where N is an integer greater than 2, includes a DC source having first and second terminals for deriving equal amplitude opposite polarity DC voltages, a series resonant circuit, and N output terminals, one for each phase of the converter. The series resonant circuit i

A DC to N phase AC converter, where N is an integer greater than 2, includes a DC source having first and second terminals for deriving equal amplitude opposite polarity DC voltages, a series resonant circuit, and N output terminals, one for each phase of the converter. The series resonant circuit is selectively connected in series with the first and second terminals and the N output terminals for an interval equal to one half cycle of the resonant circuit resonant frequency, so that current flows between a selected one of the first and second terminals and the resonant circuit and a selected one of the N output terminals during the interval. The resonant circuit current is zero at the beginning and end of the interval. A capacitor shunting each of the output terminals has a value relative to the capacitance of the series resonant circuit such that the voltage across each output terminal remains approximately constant between adjacent exchanges of energy between the resonant circuit and the output terminal. The selective connection is in response to a comparison of the actual voltage across each of the N output terminals and a reference voltage for each of the N output terminals. The comparison controls when the flow of current between the selected first and second terminals and the selected output terminal via the resonant circuit begins. The frequency of the AC voltage developed across the N output terminals is much less than the resonant frequency of the circuit.

대표청구항 ▼

A method of regulating a load so it has a predetermined voltage, the load being regulated with a resonant circuit selectively connected between the load and a source, the resonant circuit including a series capacitor, the load including a shunt capacitor having a value such that the load voltage rem

A method of regulating a load so it has a predetermined voltage, the load being regulated with a resonant circuit selectively connected between the load and a source, the resonant circuit including a series capacitor, the load including a shunt capacitor having a value such that the load voltage remains relatively constant between adjacent exchanges of energy between the resonant circuit and to the load, comprising charging the series capacitor to a level determined by the source voltage and the voltage across the shunt capacitor, and connecting the source in series with the load and the resonant circuit while the series capacitor is charged to said level for an interval equal to one half cycle of the resonant circuit resonant frequency so current flowing between the source and the load via the resonant circuit during the interval is zero at the beginning and end of the interval.