Patent ID: 7291987

Claim:
A power supply system for flat panel display devices, comprising: a converter circuit, receiving an alternating current (AC) signal from an AC power source, and converting the received AC signal into a high direct current (DC) signal; and a high voltage (HV) inverter system coupled to the converter circuit for receiving the high DC signal from the converter circuit, and configured to convert the high DC signal into an AC output voltage to power one or more backlight lamps, wherein the HV inverter system comprises: a transformer circuit; a power stage circuit coupled to a primary side of the transformer circuit; and a current balance circuit coupled between a secondary side of the transformer circuit and the backlight lamps; wherein the current balance circuit comprises a plurality of current transformers, each of which comprises at least two windings, connected in a multi-tier configuration to balance each current flowing to the backlight lamps, and each current transformer comprises dual input and output winding ends, with one of the dual output winding ends from one of the current transformers coupled exclusively to one of the dual input winding ends of another one of the current transformers.