Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1989-09-06
1991-09-03
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 97, 363124, 363134, 363 41, H02M 545
Patent
active
050459899
ABSTRACT:
In a PWM control type power supply apparatus, a modulation (high frequency) signal component is eliminated from an AC output. The PWM control type power supply apparatus includes: AC-to-DC converting means coupled to an AC (alternating current) power source capable of supplying a first AC voltage having a low frequency from a pair of output terminals, for converting the first AC voltage to obtain a positive DC (direct current) voltage from a positive half cycle of the first AC voltage appearing at one output terminal and a negative DC voltage from a negative half cycle of the first AC voltage appearing at one output terminal with a common voltage appearing at the other output terminal; and, DC-to-AC inverter means including a pair of first and second switching elements, and a PWM (pulse width modulation) controller for controlling switching operations of the first and second switching elements in a PWM control mode so as to invert the positive and negative DC voltage into a second AC voltage having a modulation frequency higher than the low frequency with respect to the common voltage output terminal, whereby the second AC voltage contains no modulation frequency component.
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Rajagopalan, Dec. 1987 18th Annual IEEE Power Electronics Specialist Conference, "Analysis and Design Of A Oval Series Resonant Converter For Utility Interface".
Hata Yoshitaka
Higaki Shigetoshi
Beha Jr. William H.
Kabushiki Kaisha Toshiba
Sterrett Jeffrey
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