Electronic ballast with open circuit voltage control and...

Details Electronic ballast with open circuit voltage control and... Electronic ballast with open circuit voltage control and...

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/36 (2006.01)

Patent

CA 2488763

An electronic ballast uses a voltage sampling circuit and a voltage control circuit to limit the open circuit voltage of the ballast. A lamp voltage sensing circuit is provided that uses a voltage dividing capacitor to accomplish lossless monitoring of the open circuit voltage of the ballast. A resistor placed in series with the sampling capacitor is used to create a voltage that turns a control transistor off and on. The control transistor produces a gating signal trimming signal that a half bridge driver uses to alter the gating signals provided to the inverter transistors of the ballast. A cable compensation circuit is included that minimizes variations in the open circuit voltage due to the connecting and disconnecting of a cable to the ballast by turning the control transistor off and on.

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