01-11-2012 дата публикации
Номер: US20120274136A1
A multi-path constant current driving circuit. In the multi-path constant current driving circuit, a current sharing transformer (T 31 , T 32 , T 33 , T 3 ( n −1)) is provided in power supply circuits which are provided with adjacent rectifier and filter units (Z 31 , Z 32 , Z 33 , Z 3 n ). A first winding of the current sharing transformer (T 31 , T 32 , T 33 , T 3 ( n −1)) is connected between a first terminal of a secondary winding of a first power supply circuit and the rectifier and filter unit (Z 31 , Z 32 , Z 33 , Z 3 n ) of the first power supply circuit. A second winding of the current sharing transformer (T 31 , T 32 , T 33 , T 3 ( n −1)) is connected between a first terminal of a secondary winding of a second power supply circuit and the rectifier and filter unit (Z 31 , Z 32 , Z 33 , Z 3 n ) 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 (T 31 , T 32 , T 33 , T 3 ( n −1 )). The current sharing transformer (T 31 , T 32 , T 33 , T 3 ( n −1)) is used for sharing the current between the power supply circuits which are provided with the adjacent rectifier and filter units (Z 31 , Z 32 , Z 33 , Z 3 n ). The driving circuit is provided with high current sharing efficiency, a small size and a low cost.
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