Lamp protection circuit for electronic ballasts

Electric lamp and discharge devices: systems – With automatic shunt and/or cutout – Supply circuit current and/or potential actuated switch

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315225, H05B 3702

Patent

active

056357990

ABSTRACT:
An electronic ballast has a protection circuit particularly useful for smaller diameter gas discharge lamps including compact fluorescent lamps. The protection circuit prevents lamps from overheating by preventing the ballast from providing sustained output power when the magnitude of the ballast output voltage indicates abnormal lamp operation. The protection circuit has a voltage sensor which develops a voltage that is more negative than the negative DC supply terminal of the inverter so that an inexpensive low-voltage SCR can be used to turn off the inverter. The circuit provides automatic restarting of the ballast after a new lamp has been installed to eliminate the need for toggling the input power to the ballast.

REFERENCES:
patent: Re32901 (1989-04-01), Nilssen
patent: Re32953 (1989-06-01), Nilssen
patent: 4398126 (1983-08-01), Zuchtriegel
patent: 4503363 (1985-03-01), Nilssen
patent: 4562383 (1985-12-01), Kerscher
patent: 4667131 (1987-05-01), Nilssen
patent: 5004955 (1991-04-01), Nilssen
patent: 5436529 (1995-07-01), Bobel
patent: 5475284 (1995-12-01), Lester et al.
patent: 5493180 (1996-02-01), Bezdon

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