Automotive high intensity discharge lamp ballast circuit

Details Automotive high intensity discharge lamp ballast circuit Automotive high intensity discharge lamp ballast circuit

2007-10-30

2007-10-30

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

C315S226000, C315S246000, C315S308000

Reexamination Certificate

active

11369053

ABSTRACT:
An electronic ballast for driving a high intensity discharge (HID) lamp is provided. The electronic ballast includes a voltage boost stage for receiving a DC input voltage and outputting a boosted DC output voltage with a controlled current. It further includes a switching stage for converting the boosted DC output voltage to a switched AC voltage capable of driving the HID lamp. An integrated circuit (IC) is coupled to the voltage boost stage and the switching stage for controlling both. The IC includes a lamp power control circuit comprising a sensing circuit for sensing an output current from the switching stage and the boosted DC output voltage, a current control loop which controls the lamp power if the lamp current is at a maximum level and a power control loop which controls the lamp power if the lamp current is below a maximum level. The IC also includes a controller unit interface and provides an ignition mode and a regular operation mode.

REFERENCES:
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patent: 5569984 (1996-10-01), Holtslag
patent: 7023143 (2006-04-01), Harada et al.
patent: 2004/0217742 (2004-11-01), Ribarich et al.
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patent: 2006/0087250 (2006-04-01), Fiorello
patent: 2006/0087259 (2006-04-01), Fiorello
patent: 2006/0113922 (2006-06-01), Ribarich et al.
patent: 2006/0279230 (2006-12-01), Lee et al.

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