Power conversion system, method for controlling the same, and un

Details Power conversion system, method for controlling the same, and un Power conversion system, method for controlling the same, and un

1991-11-26

1994-02-08

Stephan, Steven L.

Electric power conversion systems

Cascaded or combined, diverse conversions in which the...

Current and frequency

363 41, 363159, H02M 527

Patent

active

052853659

ABSTRACT:
A three-phase a.c. uninterruptible power supply includes a transformer providing isolation between an input and an output, a single-phase inverter, and a cycloconverter. The uninterruptible power supply operates to convert a d.c. voltage into a high-frequency a.c. voltage in the single-phase inverter, transmit the output voltage of the single-phase inverter in an isolated state, and convert the output of the transformer into a three-phase voltage having a lower frequency, such as 50 or 60 Hz, than the frequency of the output voltage of the single-phase inverter. This enables the transformer providing isolation to operate at a high frequency, thereby enabling the size of the transformer to be reduced.

REFERENCES:
patent: 4855887 (1989-08-01), Yamata et al.
patent: 5159539 (1992-10-01), Koyama
Conf. Record of the 1990 IEEE Industry Applications Society Annual Meeting, Oct. 7, 1990, pp. 1119-1124 Kawabata, "High Frequency Link DC/AC Converter with PWM Cycloconverter".
21 Annual IEEE Power Electronics Specialists Conf. Jun. 11, 1990, pp. 749-756, Yamato, "High Frequency Link DC/AC Converter for Ups with a New Voltage Clamper".

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