Variable frequency soft switching power supply with reduced noise and improved power factor
US6061253A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1998 |
| Grant date | May 9, 2000 |
| Priority date | — |
| Expiry date | Dec 3, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply uses zero-current and zero-voltage switching to reduce switching noise. A main switch and an auxiliary switch channel current and voltage between various component paths to maintain a DC output voltage while switching in zero-current or zero-voltage states. Switch ON-OFF time ratios are controlled with a simple scheme to improve the circuit power factor. The switching rate can be set to arbitrary frequencies, with switch ON time and OFF time being controlled independently. This scheme permits efficient driving of a load that is substantially less than the rated load, as generally found in portable TV circuits. The switches and control functions can be implemented on an integrated circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.