Light emitting diode driving circuit
US11184965B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2020 |
| Grant date | Nov 23, 2021 |
| Priority date | — |
| Expiry date | May 21, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/375
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED driving circuit includes a power source, a first voltage stepping-down module, a constant current driving module, a second voltage stepping-down module, a DIP switch module, a control module and a loading module. The power source provides a source voltage. The first voltage stepping-down module reduces the source voltage's voltage level and correspondingly generates a first buck voltage. The second voltage stepping-down module reduces the first buck voltage's voltage level to generate a second buck voltage. The DIP switch module generates a maximal current indicating signal according to the second bulk voltage. The control module generates a PWM signal based on the second buck voltage and the maximal current indicating signal. The constant current driving module generates a drive current according to the first buck voltage and the PWM signal, and drives the loading module using the drive current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.