Ballast containing protection circuit for detecting...

Details Ballast containing protection circuit for detecting... Ballast containing protection circuit for detecting...

H - Electricity

05

B

H05B 41/298 (2006.01) H05B 41/29 (1995.01)

Patent

CA 2155140

A ballast includes an inverter for providing an AC voltage to a discharge lamp. As the lamp approaches end-of-life, a DC voltage component develops across the lamp. The ballast includes circuitry for monitoring the condition of each of the cathodes by measuring this DC voltage component. After a predetermined increase in this DC voltage component, the inverter is disabled in order to prevent excessive heating of the cathodes. The inverter is also disabled as a result of a resonant or near resonant mode condition of a tank circuit caused by an open circuit condition or a leaking lamp.

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