Power supply with improved power factor correction
US5003454A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 9, 1990 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Jan 9, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P80/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A regulated voltage converter circuit includes a storage inductor and a controlled semiconductor switch connected in series circuit to a pair of input terminals that supply a full wave rectified voltage of a sinusoidal 60 Hz AC input voltage. A power factor amplifier receives a divided part of the rectified voltage and produces an output control voltage V.sub.M of a predetermined waveform (FIG. 2c). A comparison circuit compares the control voltage V.sub.M with a ramp voltage that is proportional to the current flowing through the semiconductor switch. The comparison circuit supplies PWM pulses to a control electrode of the semiconductor switch so as to regulate the output voltage of the converter circuit. The control voltage (V.sub.M) waveform is chosen so as to produce near unity power factor correction at the input of the converter circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.