Method and system for detecting LED short circuit in LED strings or detecting matching among LED strings
US9733314B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2014 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Jun 28, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/52
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This specification relates to a method and a system for detecting light emitting diode (LED) short circuit in a plurality of LED strings or detecting matching among the plurality of LED strings, wherein one end of each of the plurality of LED strings is connected to a same output end of a power supply, and the other end is respectively connected to a corresponding switch. According to the present invention, first current of each of LED strings is obtained when the output end of the power supply outputs a first voltage; differences between the minimum of the first currents of LED strings and other first currents are calculated; the differences are compared with a comparing threshold; it is determined that the LED strings corresponding to the other currents for which differences are larger than the comparing threshold include short circuit or mismatch with the LED string corresponding to the minimum current. Accordingly, it is possible to reduce the number of pins and area of a control chip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.