Ballast with protection circuit for quickly responding to...

Details Ballast with protection circuit for quickly responding to... Ballast with protection circuit for quickly responding to...

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/285 (2006.01) H05B 41/46 (2006.01)

Patent

CA 2390400

A ballast (10,20) for powering a gas discharge lamp load (30) comprises a protection circuit (300,600) operable to monitor an electrical signal (40) in the ballast and disable the ballast for at least a predetermined period of time in response to a disturbance wherein at least a portion (44) of the electrical signal (40) exhibits a time-rate-of change that exceeds the time-rate-of change of the signal during normal operation of the ballast and gas discharge lamp load. Protection circuit (300,600) is capable of disabling the ballast within a response time that is less than twice the period of the electrical signal. In a preferred embodiment that is suitable for ballasts with driven-type inverters, protection circuit (300) comprises a latching device (310) and a triggering circuit (330). In a preferred embodiment that is suitable for ballasts with self oscillating type inverters, protection circuit (600) comprises a pull-down circuit (640) and a negative voltage source (610).

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