Noise reduction systems and methods for unshielded coupling of switch mode power supply
US8023294B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2008 |
| Grant date | Sep 20, 2011 |
| Priority date | — |
| Expiry date | Jun 7, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/003
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
We describe a switch mode power supply having a power input, a switch, a transformer, and a power output. The transformer has a primary winding coupled to said power input via said switch, and a secondary winding coupled to said power output. The transformer further comprises an auxiliary winding and a coupling structure capacitatively coupled to said secondary winding of said transformer; wherein said coupling structure does not comprise a shield or screen between said primary and secondary windings. The switch mode power supply further comprises a coupling capacitor connected between said coupling structure and said auxiliary winding to provide a noise suppression voltage from said auxiliary winding to said secondary winding to at least partially cancel a common mode noise voltage on said secondary winding from unshielded coupling from said primary winding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.