Converter for converting an AC power main voltage to a...

Details Converter for converting an AC power main voltage to a... Converter for converting an AC power main voltage to a...

2005-02-15

2005-02-15

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000, C315S308000

Reexamination Certificate

active

06856098

ABSTRACT:
An electronic converter converts high-voltage AC power main voltage, such as 120V, 240V or 277V, to a low-voltage suitable for driving a halogen lamp. The converter includes a rectifier circuit, starter circuit, a driver circuit, a current sensing circuit and a transformer circuit with an optional synchronous output rectifier. The current sensing circuit senses an output current of the converter. The sensed current is used to govern pulse-width modulation of the lamp drive voltage, to provide over-voltage protection. Temperature protection can also be provided to reduce drive current when the converter overheats. This enables reliable operation of the converter over an extended temperature range, and reduces the occurrence of converter component failures due to ground faults or overheating.

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STMicroelectronics Application Note:Electronic Transformer for a 12 V Halogen Lamp, R. Fichera et al., 1999.

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