Switching power supply
US6188207A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 2000 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Mar 24, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The choke coil is in series at one of a pair of source supply lines, and the switching element is connected between the pair of source supply lines and intermittently cuts off the DC input voltage. The rectifier/smoothing circuit is input with a voltage achieved by superimposing a flyback voltage onto the DC input voltage. The flyback voltage is generated at the choke coil while the switching element is set in an OFF state. The synchronous rectifying device is constituted of an NPN transistor. The smoothing capacitor outputs a stepped up DC voltage at a first and second end, with the first end being connected to the synchronous rectifying device. The auxiliary winding is magnetically coupled with the choke coil, and the DC blocking capacitor is provided between the auxiliary winding and a base of the NPN transistor. The reset circuit is connected between the base of the NPN transistor and any one of the first and second end of the smoothing capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.