Patent ID: 7319296

Claim:
A driving device for driving a plurality of lamps each comprising a first terminal and a second terminal, comprising: a power stage circuit for converting a direct current (DC) signal to a first alternating current (AC) signal; a transformer circuit electrically connectable to the power stage circuit, for converting the first AC signal to a second AC signal; and a current balancing circuit to balance currents of the lamps, the current balancing circuit comprising a plurality of current balancing components each comprising two inputs and two outputs, herein the number of the current balancing components is defined as n, where n is an integer from 2 to n; wherein the inputs of a first current balancing component are electrically connected to a terminal of the transformer circuit, the inputs of the n th current balancing component are electrically connected to the outputs of the (n−1) th current balancing component, and the outputs of each current balancing component are respectively electrically connected to the first terminals of two of the lamps.