Power factor correction circuit for reducing distortion of input current
US8320144B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 2008 |
| Grant date | Nov 27, 2012 |
| Priority date | — |
| Expiry date | Jul 31, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/70
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention relates to a power factor correction circuit that can reduce distortion of input current in a switching mode power supply. The power factor correction circuit provided in the present invention basically comprises a first inductor which is electrically connected at a first end thereof to an input terminal, a second coil that is coupled to the first inductor to form an induced voltage, a switch electrically connected to the a second terminal of the first inductor, and a switching control unit for controlling turn-on and turn-off of the switch. In such a power factor correction circuit of the present invention, the switching control unit is configured to differently set a turn-on period of the switch depending on the input voltage by generating a signal for controlling the turn-off of the switch using a second coil voltage induced at the secondary coil of the inductor by input voltage or a directly sensed input voltage. Accordingly, distortion of input current can be effectively corrected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.