| 摘要 |
A multi-path constant current driving circuit. In the multi-path constant current driving circuit, a current sharing transformer (T31, T32, T33, T3(n−1)) is provided in power supply circuits which are provided with adjacent rectifier and filter units (Z31, Z32, Z33, Z3n). A first winding of the current sharing transformer (T31, T32, T33, T3(n−1)) is connected between a first terminal of a secondary winding of a first power supply circuit and the rectifier and filter unit (Z31, Z32, Z33, Z3n) of the first power supply circuit. A second winding of the current sharing transformer (T31, T32, T33, T3(n−1)) is connected between a first terminal of a secondary winding of a second power supply circuit and the rectifier and filter unit (Z31, Z32, Z33, Z3n) of the second power supply circuit. In-phase current flows through the dotted terminal of the first winding and the synonym terminal of the second winding of the current sharing transformer (T31, T32, T33, T3(n−1)). The current sharing transformer (T31, T32, T33, T3(n−1)) is used for sharing the current between the power supply circuits which are provided with the adjacent rectifier and filter units (Z31, Z32, Z33, Z3n ). The driving circuit is provided with high current sharing efficiency, a small size and a low cost. |
| 主权项 |
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. |
