Patent ID: 8629664

Claim:
A multipath constant-current driving circuit, comprising: a DC/AC converter, a main transformer and at least two rectification and filtering units, wherein, the DC/AC converter is adapted to provide an alternating current (AC) voltage for the main transformer; the main transformer comprises at least one secondary winding with a tap, the tap divides the corresponding secondary winding into a first winding and a second winding, with a non-dotted terminal of the first winding being connected to a dotted terminal of the second winding; each of the at least two rectification and filtering units forms a power supply loop with the secondary winding of the main transformer; each of the power supply loops comprises a first rectification loop and a second rectification loop for rectification of the positive and the negative halves of an AC voltage output from the main transformer, respectively; and the first winding and the second winding are in the first rectification loop and the second rectification loop, respectively; and a current-balancing transformer is arranged between two adjacent power supply loops; and the current-balancing transformer comprises four windings in respective rectification loops comprised by the first power supply loop and the second power supply loop, for current balancing between the different rectification loops where the adjacent rectification and filtering units are in.