Switched constant current driving and control circuit
US7358681B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2006 |
| Grant date | Apr 15, 2008 |
| Priority date | — |
| Expiry date | Dec 20, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The driving and control device according to the present invention provides a desired switched current to a load including a string of one or more electronic devices, and comprises one or more voltage conversion means, one or more dimming control means, one or more feedback element and one or more sensing means. The voltage conversion means may be a DC-to-DC converter for example and based on an input control signal converts the magnitude of the voltage from the power supply to another magnitude that is desired at the high side of the load. The dimming control element may comprise a switch such as a FET, BJT, relay, or any other type of switching device, for example, and provides control for activation and deactivation of the load. The feedback means is coupled to the voltage conversion element and a current sensing element and provides a feedback signal to the voltage conversion element that is indicative of the voltage drop across the current sensing element which thus represents the current flowing through the load. The current sensing element may comprise a fixed resistor, variable resistor, inductor, or some other element which has a predictable voltage-current relationship and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.