Inverter control circuit

Details Inverter control circuit Inverter control circuit

1985-10-30

1987-05-19

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 66, 307 87, 363 79, H02J 900

Patent

active

046671161

ABSTRACT:
An inverter control circuit for a power supply source comprising an inverter and a commercial power source (reserve power source) and adapted to connect the inverter normally to a load and to change the inverter with the commercial power source uninterruptedly by means of a thyristor switch to supply power uninterruptedly to the load in case the inverter malfunctions. The inverter control circuit comprises a digital PLL circuit for synchronism control, a bias signal, and a parallel connection of a synchronism control circuit and a synchronism detecting circuit, and is capable of uniterruptedly changing the inverter to the commercial power source by being switched to biasing signals by means of the switch at the timing of the synchronism detecting of the synchronism detecting circuit in case the synchronism control circuit malfunctions.

REFERENCES:
patent: 3515895 (1970-06-01), Bratton
patent: 3612894 (1971-10-01), Schmidt
patent: 3805139 (1974-04-01), Hoffman
patent: 3991319 (1976-11-01), Servos et al.
patent: 3999077 (1976-12-01), Borkovitz et al.
patent: 3999078 (1976-12-01), Udvardi-Lakos
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patent: 4065711 (1977-12-01), Kawabata
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patent: 4238691 (1980-12-01), Ebert
patent: 4241261 (1980-12-01), Ebert
Japan Telecommunication Review vol. 22, No. 4, (Oct. 1980).
Shiro Doi et al., Journal OHM, Jun. 1983 Issue, "Uninterruptible Power Supply (CVCF) System and Influence Countermeasure", pp. 20-23.

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