BALLAST AND ASSOCIATED CONTROL CIRCUIT
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United States of America Patent
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Issued Date -
Oct 4, 2012
app pub date -
Mar 29, 2012
filing date -
Apr 1, 2011
priority date (Note) -
Abandoned
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Abstract
The embodiments of the present invention disclose a ballast and associated control circuit wherein the control circuit comprises a multi function pin, a preheat cut-off circuit and an over-voltage protection circuit, wherein the multi function pin is coupled to the preheat cut-off circuit and a first switch configured to turn on the first switch at a preheat state of the ballast and to turn off the first switch at the end of the preheat state, and wherein the multi function pin is further coupled to the over-voltage protection circuit and a voltage sense circuit configured to receive a sensed output voltage signal and to stop the ballast after the preheat state when the sensed output voltage is larger than a first threshold. Compared with prior art, the present invention may reduce the volume and lower down the cost of circuit.
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