Switching power supply device
US6590790B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 2001 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Oct 9, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33571
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply device in which a transformer, a first switch circuit, and an input power source are connected in series. A series circuit formed of a second switch circuit and a capacitor is connected to one end of the first switch circuit. The transformer has a driving winding which is wound in the same direction as that of the primary winding of the transformer. A capacitive impedance element including a series circuit formed of a capacitor and an inductive ferrite bead, is connected between the termination of the driving winding and the input power source. The switching power supply device uses a less capacitive impedance and thus provides higher radiation noise reduction performance, thereby preventing switching devices from being damaged due to high voltage increase rate of the switching devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.