| 摘要 |
PROBLEM TO BE SOLVED: To provide a flyback transformer that implements low noise and low loss simultaneously.SOLUTION: A tertiary winding 300, a primary winding 100 having first to third coils 101-103 connected in series, and a secondary winding 200 are wound on a leg portion 20a of an iron core 20. The primary winding 100 is connected to a DC power supply via an unshown power converting on-off element connected to the first coil 101. Power on the secondary winding generated by an on-off action of the on-off element is used to drive switching elements of a power converter, and power on the tertiary winding is supplied to another load. A distance of the secondary winding 200 from the first coil 101 experiencing the greatest voltage variation under the on-off action of the on-off element can reduce a high frequency noise current flowing owing to a stray capacitance therebetween. The intervention of the tertiary winding 300 can increase the distance between the first coil 101 and the leg portion 20a to reduce a high frequency noise current flowing owing to a stray capacitance therebetween and an eddy current loss of the primary winding 100 owing to a leakage flux about an air gap. |
