Power factor correction control circuit for regulating the current waveshape in a switching power supply
US6275397A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Jun 27, 2020 |
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 comprises an AC rectifier adapted to receive an AC line voltage and provide an input voltage (V.sub.IN) therefrom having a haversine waveform. A switching power converter is connected to the AC rectifier and provides a DC output voltage (V.sub.OUT) for a load. The switching power converter comprises an inductor and a power switch adapted to control current in the inductor. A pulse width modulator provides a drive signal to the power switch having a variable duty cycle to regulate current provided to the load by the switching power converter. A power factor correction circuit is adapted to control operation of the pulse width modulator so that a waveshape of the current from the AC rectifier matches the output voltage (V.sub.OUT) with changes in the input voltage (V.sub.IN) and load. More particularly, the power factor correction circuit further comprises a voltage error circuit providing a voltage error signal corresponding to a difference between the output voltage (V.sub.OUT) and a reference voltage, a differential amplifier circuit generating a current program signal based in part on the voltage error signal, including an amplifier circuit to amplify a s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.