Ballast circuit for high intensity discharge (hid) lamps

Details Ballast circuit for high intensity discharge (hid) lamps Ballast circuit for high intensity discharge (hid) lamps

H - Electricity

05

B

321/2, 315/54, 3

H05B 41/26 (2006.01) H05B 41/231 (2006.01) H05B 41/292 (2006.01)

Patent

CA 1097730

-15- ABSTRACT An electronic ballast circuit includes a directly driven high frequency inverter circuit with a series resonant output circuit coupled to a load circuit having a high intensity discharge (HID) lamp and to a drive circuit dependent upon current flow in the load circuit. A starting circuit for the high frequency inverter is coupled to a DC source and to a charge storage and isolating circuit and provides initial energization to the high frequency inverter circuit. Also, a lamp starting circuit initiates increased conductivity of the high frequency inverter circuit which causes development of energy sufficient to "fire" an HID lamp whereupon a disablement circuit essentially removes the lamp starting circuit from the operational circuitry. -21,719

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