Current and voltage control circuit and method for a class II LED driver
US10098194B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 5, 2017 |
| Grant date | Oct 9, 2018 |
| Priority date | — |
| Expiry date | Sep 5, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driver circuit includes a combined current and voltage control circuit for driving a light emitting diode (LED) load. The driver circuit includes an isolation transformer having primary, secondary, and auxiliary windings. A primary side circuit is coupled to the primary winding and includes a power factor controller and a switch. The power factor controller controls an output current to the LED load by controlling an operational state of the switch. A secondary side circuit is coupled to the secondary winding. The secondary side circuit includes a proportional and integration (PI) control portion which outputs a control signal. A combined voltage and current control circuit is coupled to the auxiliary winding and includes an optocoupler coupled to the power factor controller and to the PI control section. The combined voltage and current control circuit transmits a control signal from the PI control section to the power factor controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.