| 摘要 |
The present invention discloses a method and system for sensing currents in a power converter. The system having two current sensing transformers each having two primary windings, a main transformer, and a plurality of switching elements. Each current sensing transformer uses one of its primary windings to sense rail current and the other primary winding to sense main transformer current. The method having a sensing a rail current using a first primary winding in a first current sensing transformer and a third primary winding in a second current sensing transformer, sensing a main transformer current using a second primary winding in the first current sensing transformer and a fourth primary winding in the second current sensing transformer, summing the current sensed in the first primary winding and the current sensed in the second primary winding in a secondary winding of the first current sensing transformer and creating a first virtual current therein, and summing the current sensed in the third primary winding and the current sensed in the fourth primary winding in a secondary winding of the second current sensing transformer and creating a second virtual current therein, wherein the first virtual current and the second virtual current are used to control an output of the power converter.
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