Patent ID: 9155141
Filing Date: 2015-10-06
Classification: H02M,H05B

Abstract:
1. A multipath constant-current driving circuit, wherein, the multipath constant-current driving circuit comprises: a DC/AC converter, a main transformer and at least two rectification and filtering units, the DC/AC converter is adapted to provide an alternating current (AC) voltage for a primary winding of the main transformer; each of the at least two rectification and filtering units forms a power supply loop with a secondary winding of the main transformer; each of the power supply loops comprises: a first terminal of the secondary winding connected to a first input terminal of a corresponding rectification and filtering unit, and a second terminal of the secondary winding connected to a second input terminal of the corresponding rectification and filtering unit; and a current-balancing transformer is arranged between power supply loops where adjacent rectification and filtering units are in; a first winding of the current-balancing transformer is arranged between a first terminal of a secondary winding and a rectification and filtering unit in a first power supply loop; a second winding of the current-balancing transformer is arranged between a first terminal of a secondary winding and a rectification and filtering unit in a second power supply loop; currents in the same direction flow through a dotted terminal of the first winding of the current-balancing transformer and a non-dotted terminal of the second winding of the current-balancing transformer, and the current-balancing transformer is for current balancing between the power supply loops where the adjacent rectification and filtering units are in.