| 摘要 |
PROBLEM TO BE SOLVED: To reduce sizes and weight of a filter apparatus and reduce higher harmonics flown into the receiving side, by disposing a higher harmonics suppressing winding between divided primary windings in a transformer and connecting a filter circuit to the output terminal of a winding. SOLUTION: The primary windings 411, 412 of a transformer 4 are divided into at least two parts, between which a higher harmonics suppressing winding 44 is formed, and a filter capacitor 31 and a resistor 32 are connected to the output terminal of the higher harmonics suppressing winding 44. As a result, the higher harmonics suppressing winding 44 is disposed between the two divided primary windings, therefore, magnetic coupling with the primary winding becomes closer. Namely, leakage inductance between the two windings becomes smaller. The higher harmonics suppressing winding 44 is separated from windings 421, 422 for converter which are secondary windings, therefore, leakage inductance between the higher harmonics suppressing winding 44 and the primary winding becomes very small. It is thus possible to provide a higher harmonics attracting action. |
