One-chip type switching power supply device

Details One-chip type switching power supply device One-chip type switching power supply device

1993-03-01

1994-10-11

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

Integrated circuit

363 21, 363 97, 323282, H02M 108

Patent

active

053553012

ABSTRACT:
To improve high frequency characteristics of a transformer in a switching power supply device and to reduce its size, the switching power supply device is formed of a voltage converting section in a thin-film laminated structure, a single semiconductor chip and a wiring layer situated between the voltage converting section and the single semiconductor chip. All the active elements including switching elements and voltage controlling sections are incorporated into the semiconductor chip and are connected to the voltage converting section through the wiring layer. To reduce the effects other than inductance of the electrical components, a thin film transformer is formed of a spiral-shaped primary coil and secondary coil formed on a substrate. The primary and secondary coils are arranged so that phases of forming cycles in the radial direction are different to have a staggered relation. Accordingly, the capacity of the parasitic capacitors between the primary coil and the secondary coil is very small.

REFERENCES:
patent: 4547961 (1985-10-01), Bokil et al.
patent: 4622627 (1986-11-01), Rodriquez et al.
patent: 4649417 (1987-03-01), Burgess et al.
patent: 4730241 (1988-03-01), Takaya
patent: 4873757 (1989-10-01), Williams
patent: 4977491 (1990-12-01), Domenget et al.
patent: 5027255 (1991-06-01), Zeitlin et al.
patent: 5053920 (1991-10-01), Staffiere et al.

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