Fdk Corporation

Satoshi Ohta

Fumiaki Nakao

Mikio Kitaoka

Tetsuya Suzuki

Shinji Watanabe

Hiroshi Sakamoto

Katsuo Yamada

A multi-channel output type transformer for outputting uniformly balanced voltage among multiple output channels. The transformer comprising a primary winding and a secondary winding that is wound round a winding shaft portion of a core. The secondary winding of the transformer is a flat cable belt comprising covered conductors corresponding to the number of output channels. The cable belts are arranged in parallel. A plane loop is formed by appropriately folding the flat cable belt, and the plane loop member is arranged to as to substantially orthogonally intersect the winding shaft of the core.

Multi-channel uniform output type transformer

A ringing choke converter capable of reducing the variation in a switching frequency to a low level even if the variation in load is large is disclosed. The ringing choke converter also serves for improvement of efficiency and solution of noise-problems. A ringing choke converter comprises a turn-on control system which detects the turn-off of the switching transistor Q1, and forcedly turns on the switching transistor Q1 after a predetermined amount of time. This turn-on control system comprises a conductive-type controlling transistor Q3 which is a different type from the switching transistor Q1, a resistance R3, and a capacitor C3. The collector of the controlling transistor Q3 is connected to the connecting point between the resistance R2 and the capacitor C2. The emitter of the transistor Q3 is connected to one end of the base winding L3. The resistance R3 is connected between the base of the transistor Q3 and the other end of the base winding L3. The capacitor C3 is connected between the base and the emitter of the transistor Q3.

Ringing choke converter

A sheet transformer wherein a coil pattern is formed on each of substrates so as to constitute a coil substrate, a plurality of the coil substrates are overlaid in multiple layers to form a primary coil and a secondary coil. The primary coil and the secondary coil are overlaid such that the middle leg cores of EE type, EI type, EER type or EIR type cores are disposed in the center of the coils and both the outside leg cores are disposed outside the coils, thereby obtaining a magnetic coupling between the coils. A higher potential side of the primary coil and a higher potential side of the secondary coil are disposed in an opposed configuration so as to face each other.

Sheet transformer

A high frequency sheet-type transformer coil structure capable of minimizing eddy current generated by parallel winding and raising power conversion efficiency when the high frequency sheet-type transformer uses sheet-like coils arranged such that a coil on a first surface and a coil on a second surface have a reverse winding order.

Growing community of inventors

Hamana-gun, Japan

Satoshi Ohta