One-chip type switching power supply device
US5355301A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1993 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Mar 1, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2017/0086
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.