Power supply apparatus for discharge lamp and control method for the same
US7317286B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2006 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Nov 20, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus supplies power to at least one discharge lamp. The apparatus includes a buck converter for regulating power supplied to at least one discharge lamp having a switching element driven by PWM pulses, and a control unit for supplying PWM pulses to the buck converter. The control unit includes a function for controlling an output power of the buck converter so as to be constant using PWM pulses of a first frequency; and a function for controlling an output voltage of the buck converter so as to be maximum using PWM pulses of a second frequency that is lower than the first frequency. The buck converter is capable of operating in discontinuous mode based on the PWM pulses of the second frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.