TRANSFORMER UNIT FOR RESONANCE TYPE SWITCHING POWER SUPPLY CIRCUIT

摘要

PROBLEM TO BE SOLVED: To solve a problem in a resonance type transformer wherein, the volume of a transformer unit is increased because a winding occupation rate is degraded when a litz wire is used for suppressing eddy current.;SOLUTION: This transformer unit for a resonance type switching power supply circuit is provided with: a transformer part 14 having a closed magnetic circuit core, and a primary winding 16 and a secondary winding 17 laminated and wound in a laminated form; and a choke coil part 15 serially connected to the primary winding 16, wherein a coupling coefficient between the primary winding 16 and secondary winding 17 is set not smaller than 0.995.;COPYRIGHT: (C)2009,JPO&INPIT