Protection circuit for arc discharge lamps

Details Protection circuit for arc discharge lamps Protection circuit for arc discharge lamps

H - Electricity

05

B

H05B 41/285 (2006.01) H05B 41/298 (2006.01)

Patent

CA 2148399

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.

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