Single-stage electronic ballast device

Details Single-stage electronic ballast device Single-stage electronic ballast device

2006-12-26

2009-06-09

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

C315S247000, C315S246000, C315S205000, C315S207000

Reexamination Certificate

active

07545102

ABSTRACT:
A single-stage electronic ballast device outputs a square wave current to drive an HID lamp, which includes a rectifying and power factor correction unit, a bridge converter and a controller circuit. The rectifying and power factor correction unit has an input connected to an AC power source to rectify an AC power to a DC power. The bridge converter comprises two bridge arms formed by four switches, load terminals defined by midpoints of the two bridge arms and the HID lamp is connected between the load terminals. The bridge converter converts DC current to square wave current to drive the HID lamp with power control. The load terminals are selectively connected to output of the rectifying and power factor correction unit to adjust waveform of input current for higher power factor. The controller circuit has output connected to DC link voltage terminal and load terminal of the bridge converter.

REFERENCES:
patent: 5172308 (1992-12-01), Tohya
patent: 5510974 (1996-04-01), Gu et al.
patent: 2004/0125625 (2004-07-01), Nillesen

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