AC to DC converter with unity power factor
US4940929A · kind A · utility
212Cited by
13References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1989 |
| Grant date | Jul 10, 1990 |
| Priority date | — |
| Expiry date | Jun 23, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An AC to DC converter comprises a bridge rectifier followed by a boost circuit. The boost circuit includes an inductor, diode and load capacitor in series and a shunting switch connected to shunt the diode and load capacitor. The control circuit for switching the shunting switch comprises a differential circuit, a multiplier and a duty cycle generator in a feedback loop which maintains a constant output voltage on the capacitor. To eliminate the response to ripple on the output voltage, the differential circuit does not respond to voltages within a dead band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.