Method and circuit arrangement for operating light-emitting means with a sudden load variation
US9445464B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 2012 |
| Grant date | Sep 13, 2016 |
| Priority date | — |
| Expiry date | Dec 20, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An operating circuit for light-emitting means (18), in particular an LED string, contains an actively clocked power factor correction circuit (11), which produces a regulated output voltage (UBUS), by means of which the light-emitting means (18) are supplied directly or indirectly via at least one further converter stage (17). The regulation is performed by means of a control unit (16), which, as manipulated variable (tON), actuates clocking of a switch of the power factor correction circuit (11). The operating circuit is designed, in the event of the presence of a predefined event, for example a rapid or sudden change in the energy demand of the light-emitting means (18), selectively: —to change suddenly the value of the manipulated variable (tON) using feedforward control, and/or —to vary the time constant of the control loop of the output voltage (UBUS).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.