Power factor correction stage control during start-up for efficient use of a negative temperature coefficient thermistor
US10340787B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2015 |
| Grant date | Jul 2, 2019 |
| Priority date | — |
| Expiry date | Jun 8, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P80/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power factor correction (PFC) stage of a power supply unit has a PFC circuit including a rectifier circuit, a PFC controller circuit with a PFC switch, a current sensor connected to the PFC switch, a high frequency bypass capacitor connected between the PFC controller circuit and the rectifier circuit, and a bulk storage capacitor connected between the PFC controller circuit and an output of the PFC stage. The PFC stage also has a negative temperature coefficient thermistor connected in series with the PFC switch and the current sensor. During a start-up of the power supply unit, the PFC controller circuit causes the PFC switch to turn-on until the PFC controller circuit causes the PFC switch to turn-off after a current through the current sensor is sensed as being equal to or greater than a preset value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.