Electronic ballast and method for operating at least one discharge lamp
US8410721B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2010 |
| Grant date | Apr 2, 2013 |
| Priority date | — |
| Expiry date | Dec 3, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/2853
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic ballast for operating at least one discharge lamp may include an input for coupling to an input voltage; a load circuit with an output, the load circuit having a bridge circuit; an intermediate circuit capacitor that is coupled to the input of the load circuit; a transformer that is coupled between the input of the ballast and the capacitor, the transformer having a transformer switch; a control apparatus for driving the switch; and a monitoring apparatus for monitoring at least one value correlated with the input voltage, the control apparatus being designed to deactivate the driving of the switch upon detection of a deactivation criterion; and a voltage measuring apparatus for measuring the intermediate circuit voltage, the control apparatus being designed to reactivate the driving of the switch after a deactivation phase when the sum of input and intermediate circuit voltage has dropped below a prescribable threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.