Active power factor correction control circuit, chip and LED driving circuit thereof
US9246381B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 2014 |
| Grant date | Jan 26, 2016 |
| Priority date | — |
| Expiry date | Dec 11, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/4241
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In one embodiment, an active power factor correction (APFC) control circuit, configured to generate a pulse-width modulation (PWM) control signal to control the operation of a power converter, can include: (i) an inductor current zero crossing detection circuit coupled to a common node between a power switch of the power converter and a first switch that are coupled in series, where the inductor current zero crossing detection circuit is configured to generate a comparison signal based on a voltage signal at the common node; (ii) the comparison signal being activated when an inductor current of the power converter decreases to zero; and (iii) the APFC control circuit being configured as a source driver, wherein a control terminal of the power switch is coupled to a constant voltage supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.