Passive circuity for harmonic current regulation in a power supply by energy efficient input current shaping
US6414859B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 2000 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Sep 18, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A passive component circuit comprising a bridge rectifier and is coupled in parallel to three capacitors; each of the first two capacitors is clamped in series by at least one diode and there in between is disposed another diode and a resistor for shaping the input current waveform such that it falls outside the Class D envelope of the limits on harmonic currents emissions. As such, power supplies incorporating such a passive circuit qualify automatically as Class A devices without further regards to power factor conversion and EMI filtering. Therefore, an economic strategy for complying with harmonic currents emissions limits is realized for low to medium power supplies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.