Protection circuit for short circuit of LED power supply
US10285239B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2017 |
| Grant date | May 7, 2019 |
| Priority date | — |
| Expiry date | Jul 9, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A protection circuit for short circuit of LED power supply includes a constant voltage source powered by the LED power supply, a constant current source powered by the LED power supply, a switching module for controlling the constant current source to turn off or turn on, and an output current detecting module for controlling the switching module to turn off or turn on. The constant current source is provided in parallel with the constant voltage source. The switching module includes a PNP type transistor connected in series to the constant current source. The output current detecting module includes a NPN type transistor, a base of the NPN type transistor being electrically connected to the output terminal of the constant voltage source, an emitter of the NPN type transistor grounding, and a collector of the NPN type transistor being electrically a base of the PNP type transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.