| US 7,541,696 B2 | ||
| Systems and methods for voltage SAG compensation | ||
| Robert Albert Dawley, Cary, N.C. (US) | ||
| Assigned to Electronics Systems Protection, Inc., Zebulon, N.C. (US) | ||
| Filed on Nov. 05, 2007, as Appl. No. 11/935,039. | ||
| Prior Publication US 2009/0115254 A1, May 07, 2009 | ||
| Int. Cl. H02J 1/00 (2006.01) | ||
| U.S. Cl. 307—103 | 25 Claims |
| 21. A method of compensating for voltage sag on a power line comprising:
charging a first capacitor and a second capacitor using an AC rectifier connected to a power line;
detecting, on the power line, a voltage sag of a predetermined amount;
disconnecting the power line from the AC rectifier and connecting the power line in such a way as to drive a gating circuit
for a DC-AC inverter;
inverting DC voltage supplied by at least one of the first capacitor or the second capacitor and applying resulting AC voltage
to the power line in series therewith; and
monitoring a voltage level of the DC voltage and disconnecting the power line from driving the gating circuit when the DC
voltage falls below a predetermined value.
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