Display monitor power supply apparatus with a power factor correction circuit
US5905491A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1997 |
| Grant date | May 18, 1999 |
| Priority date | — |
| Expiry date | Mar 31, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power supply apparatus for a display monitor includes a power factor correction circuit coupled to receive a primary voltage, for correcting a power factor of said primary voltage and generating a secondary voltage; a switch operable in response to a pulse signal; a switch control circuit for generating said pulse signal; a transformer including a primary winding and secondary windings connected to each other by mutual induction, in which the primary winding has a first terminal coupled to receive the secondary voltage and a second terminal connected to the switch, and in which the transformer is being supplied with primary induced voltage when the pulse signal has a primary duty ratio and supplied with secondary induced voltage lower than the primary induced voltage when the pulse signal has a secondary duty ratio; a rectifier for rectifying the primary and secondary induced voltages; and a smoothing circuit for smoothing an output voltage of the rectifier for application to the power factor correction circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.