Multi-path constant current driving circuit
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United States of America Patent
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Oct 6, 2015
Grant Date -
Nov 1, 2012
app pub date -
Nov 15, 2010
filing date -
Nov 21, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
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.
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