US 6,310,444 B1 · Multiple lamp LCD backlight driver with coupled magnetic components

Abstract

In this invention an inverter for driving multiple lamps has a first circuit for driving a first lamp. The first circuit is made up of a first inductor in series with a first output transformer to drive the first lamp. A second circuit drives a second lamp. The second circuit is made up of a second inductor in series with a second output transformer which drives a second lamp. The first and second transformers are coupled together by a first single magnetic core such that magnetic flux from said first and second transformers is cancelled in the magnetic core to reduce core losses while improving current matching. In a second embodiment the inverter described in the first embodiment further includes a second magnetic core coupling the first and second inductors with minimized leakage inductance. The number of magnetic components for a 2 lamp backlight is then reduced to two.

Claims27

Dependent claims

An inverter for driving multiple lamps comprising,

a first circuit for driving a first lamp, said first circuit made up of a first inductor in series with a first output transformer, said transformer driving said first lamp,
a second circuit for driving a second lamp, said second circuit made up of a second inductor in series with a second output transformer, said transformer driving said second lamp,
said first and second transformers coupled together by a first single magnetic core such that magnetic flux from said first and second transformers is cancelled in said magnetic core to reduce core losses while improving lamp current matching.

Dependencies are inferred from the claim text.

Multiple lamp LCD backlight driver with coupled magnetic components

Life of this patent

Multiple lamp LCD backlight driver with coupled magnetic components

Life of this patent

Abstract

Claims27