Title:
CURRENT-MODE DRIVER
Document Type and Number:
WIPO Patent Application WO2005059964
Kind Code:
A3
Abstract:
An efficient and flexible current-mode driver delivers power to one or more light sources in a backlight system. In one application, the current-mode driver (306, 308) is configured as an inverter with an input current regulator, a non-resonant polarity-switching network, and a closely-coupled output transformer. The input current regulator can output a regulated current source in a variety of programmable wave shapes. The current-mode driver may further include a rectifier circuit (320, 322, 324, 326) and a second polarity-switching network between the closely-coupled output transformer (310) and a lamp load (312). In another application, the current-mode driver delivers power to a plurality of light sources in substantially one polarity by providing a regulated current to a network of time-sharing semiconductor switches coupled in series with different light sources coupled across each semiconductor switch.
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Inventors:
BALL NEWTON E
Application Number:
PCT/US2004/041912
Publication Date:
November 10, 2005
Filing Date:
December 14, 2004
Export Citation:
Assignee:
MICROSEMI CORP (US)
International Classes:
H05B37/02; H05B39/00; H05B41/16; H05B41/24; H05B41/282; H05B44/00; H01L; (IPC1-7): H05B37/02
Foreign References:
| US4761722A | 1988-08-02 | |||
| US3742330A | 1973-06-26 | |||
| US4686615A | 1987-08-11 | |||
| US3737755A | 1973-06-05 |
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