Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1990-04-24
1991-11-05
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
315247, 315307, 363 80, 363 98, 363124, H02M 5458
Patent
active
050634909
ABSTRACT:
An improved inverter AC power supply includes a chopper providing a DC voltage from an AC source voltage and an inverter providing from the DC voltage a high frequency AC voltage to a load. The chopper incorporates a pair of first and second switching elements operating to turn on and off for obtaining a periodically interrupted AC voltage which is rectified and smoothened to provide the DC voltage to the inverter. The inverter is arranged to share the first and second switching elements in common to the chopper, and operates to drive the same switching elements for switching the DC voltage in order to provide a desired AC voltage to the load. The power supply is provided with an input power sensor monitoring an input power supplied to the chopper and an output power sensor monitoring an output power from the inverter to the load. A power controller is included for varying at least one of a switching frequency and a duty ratio for the first and second switching elements in accordance with the monitored chopper input power and inverter output power for equalizing the input and output powers.
REFERENCES:
patent: 4523131 (1985-06-01), Zansky
patent: 4564897 (1986-01-01), Okamoto et al.
patent: 4905136 (1990-02-01), Tanaka
patent: 4933831 (1990-06-01), Takahashi et al.
Maehara Minoru
Nagase Haruo
Beha Jr. William H.
Matsushita Electric & Works Ltd.
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