Lossless circuit for sampling of lamp voltage

Details Lossless circuit for sampling of lamp voltage Lossless circuit for sampling of lamp voltage

H - Electricity

05

B

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

Patent

CA 2488768

An electronic ballast has a resonant tank circuit that includes a tank inductor and a tank capacitor connected in series. Lossless sampling of the output voltage of the electronic ballast is achieved by monitoring the voltage across a sampling capacitor placed in series with the tank capacitor. A resistive and capacitive filter is used to filter the monitored voltage such that it can be accurately received by a microcontroller. A resistor is connected in series with the sampling capacitor to produce an opera circuit output voltage control signal that is used by the microcontroller to limit the open circuit output voltage. A cable compensation circuit is utilized to minimize variations in the open circuit voltage due to the connecting and disconnecting of a cable to the ballast output terminals.

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