AC-to-AC power inverter apparatus functioning without smoothing

Details AC-to-AC power inverter apparatus functioning without smoothing AC-to-AC power inverter apparatus functioning without smoothing

1993-10-29

1996-01-02

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 41, 318801, H02M 545, H02M 112, H02P 534

Patent

active

054814510

ABSTRACT:
An AC-to-AC power inverter apparatus and a control method thereof are described in which the effects of AC ripple contained in an intermediate DC voltage produced in the apparatus are eliminated from the output AC voltage, thereby enabling the inverter apparatus to function without a large-capacitance smoothing capacitor. The amplitude of the DC voltage, including the AC ripple amplitude, is detected, the amplitude of a reference AC waveform is divided by the detected amplitude, and the value of the resultant ratio is applied to control the duty factor of a PWM signal, which controls a DC-to-AC inverter circuit. Changes in the DC voltage due to AC ripple are thereby prevented from affecting the output AC voltage obtained, which has an average value waveform corresponding to the reference waveform.

REFERENCES:
patent: 4802077 (1989-01-01), Fujii et al.
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patent: 5204606 (1993-04-01), Kuwahara et al.
patent: 5231339 (1993-07-01), Kishimoto et al.
patent: 5241256 (1993-08-01), Hatanaka et al.
patent: 5375050 (1994-12-01), Nakata et al.
patent: 5414615 (1995-05-01), Kumar et al.

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