Patent ID: 9480126
Filing Date: 2016-10-25
CPC Classification: H01F,H05B,Y10S

Claim Text:
1. A ballast configured to connect to a plurality of lamps and provide alternating current (AC) power to the plurality of lamps, the ballast comprising: an oscillator configured to receive direct current (DC) power from a DC power rail and provide the AC power to the plurality of lamps; a starting transformer comprising an unbalanced load sensing circuit connected to the second secondary winding of the starting transformer, wherein the unbalanced load sensing circuit is configured to monitor a voltage across the second secondary winding of the starting transformer and provide a shut down signal to the oscillator when the voltage across the second secondary winding of the starting transformer exceeds a threshold; wherein the oscillator is further configured to cease providing the AC power to the plurality of lamps in response to receiving the shut down signal from the unbalanced load sensing circuit.