Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1992-10-08
1994-09-13
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 64, H02J 900
Patent
active
053471644
ABSTRACT:
A method and apparatus is described for providing uninterrupted DC and selectable AC power depending on the value of utility-supplied AC voltage range. In the AC 115 V output case, by means of setting a selecting switch and switching a relay port, the DC/AC inverter will function as a half bridge switching circuit upon power failure and use the mid-point of series connected filtering capacitors as a relative ground reference point, to provide an AC 115 V output; in the AC 230 V output case, by means of different setting of the selecting switch and switching a relay port, a DC/AC inverter will function in a full bridge circuit upon power failure and use the full voltage of the series connected filtering capacitors, to provide an AC 230 V output. The power source of the control circuit in the backup portion is interlocked and sequentially controlled for the purpose of power saving.
REFERENCES:
patent: 4384214 (1983-05-01), Crick et al.
patent: 4528459 (1985-07-01), Wiegel
patent: 4560886 (1985-12-01), Ferguson
patent: 4860185 (1989-08-01), Brewer et al.
Accton Technology Corporation
Gaffin Jeffrey A.
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