Symmetrical universal AC-AC power conditioner

Details Symmetrical universal AC-AC power conditioner Symmetrical universal AC-AC power conditioner

1991-11-07

1994-05-24

Skudy, R.

Electric power conversion systems

Current conversion

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

363 37, 363 39, H02J 301

Patent

active

053154975

ABSTRACT:
An apparatus is disclosed which is capable of conditioning any of a variety of utility service AC power inputs having distortion and noise into a clean AC power signal at the output by using symmetrical topology. The present invention is capable of maintaining a constant voltage amplitude at the output while the input utility voltage amplitude varies, and attenuates any distortions present at the input. The present invention first comprises a boost converter comprised of four semiconductor switches in parallel with a diode bridge to convert the incoming AC signal into a DC signal which is stored on two storage capacitors. Secondly, using a buck inverter, the stored DC signal is reconverted into a clean AC signal applied to the output. Input and output filters are used to help clean the signal, and chokes are used to help separate damaging signals produced by the converter and inverter from the storage capacitors. Appropriate control circuits for operating the semiconductor switches in the boost converter and buck inverter are also disclosed.

REFERENCES:
patent: 4827151 (1989-05-01), Okado
patent: 4933831 (1990-06-01), Takahashi et al.
patent: 4934822 (1990-06-01), Higaki
patent: 4935861 (1990-06-01), Johnson et al.
patent: 5017800 (1991-05-01), Divan
patent: 5045989 (1991-09-01), Higaki et al.
patent: 5063490 (1991-11-01), Maehara et al.
patent: 5111373 (1992-05-01), Higaki
patent: 5126585 (1992-06-01), Boys

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