DC to DC conversion circuit with variable output voltage

Details DC to DC conversion circuit with variable output voltage DC to DC conversion circuit with variable output voltage

2007-03-05

2008-12-02

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Reexamination Certificate

active

07459866

ABSTRACT:
The present invention provides a DC to DC conversion circuit, comprising a DC power supply, a DC to DC converter, a power management IC and a load, wherein the load may be a backlight source of a liquid crystal display. The power management IC controls the DC to DC converter to convert a DC voltage supplied by the DC power supply to an output voltage of the DC to DC converter, which is supplied to the load. The power management IC is capable of controlling the DC to DC converter to adjust the output voltage to a minimum voltage actually needed by the load according to the variation of the minimum voltage which is actually needed by the load.

REFERENCES:
patent: 6577512 (2003-06-01), Tripathi et al.
patent: 7122971 (2006-10-01), Yeh et al.
patent: 7265681 (2007-09-01), Chen
patent: 2004/0251854 (2004-12-01), Matsuda et al.
patent: 2004/0251857 (2004-12-01), Ryu et al.
patent: 2007/0114951 (2007-05-01), Tsen et al.

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