Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Tomio Marui

Koji Nakashima

Toshiyuki Nakata

Michihiro Miyauchi

Etsuo Tsujimoto

Fumiaki Hashimoto

Yoshiyuki Miyoshi

Satoru Taniguchi

Naoki Hashimoto

Satoru Inaba

Tsukasa Suzuki

In a transformer including a coil part having a first bobbin to which a coil is mounted, a second bobbin to be fitted to the first bobbin combined to each other, the coil part being sandwiched between magnetic cores from above and below, the first bobbin includes at least one lead drawing through holes on a periphery on the inner peripheral side of a coil mounting surface, and at least one of coil-drawn-leads of the coil is drawn through the lead drawing through hole. With this transformer, coming out of the coil-drawn-lead, displacement, and erroneous wiring are prevented, and hence the inserting capability of the coil is improved. Therefore, the workability is remarkably improved, and hence a product which is low in price can be provided.

Transformer

In a power conversion module device of the present invention, a transformer, a primary power element and a secondary power element are mounted on a printed wiring board in surface-to-surface contact therewith, and no control circuit is mounted thereon. In addition to reducing impedance and loss in the wiring, this constitution improves the voltage waveform of the primary power element. Thus, noise reduction can be achieved. Further, because heat can be transferred to the printed wiring board, heat generated from the transformer, the primary power element and the secondary power element can be reduced. The size of the transformer can also be reduced.

Power conversion module device and power unit using the same

A multilayered coil is formed by inserting insulating paperhaving either a pressure sensitive adhesive or an adhesive disposed on both faces thereof into at least one place between thin coil layers and then magnetic coresare mounted to the multilayered coil from above and below. Thus, a thin transformer for a switching power supply is provided, in which variation in distance between coiland coil, of which one is disposed over the other, variation in distance of coiland coilfrom magnetic coreand the like are suppressed.

Low-profile transformer and method of manufacturing the transformer

Growing community of inventors

Mie, Japan

Tomio Marui