Patent · US Active

Short circuit detection for lighting circuits

US9084330B2 · kind B2 · utility

3Cited by

4References

13Claims

0Family size

Assignee

DIALOG SEMICONDUCTOR INC. · DE

Inventors

Christian Wolf · Arlington, US
Andrea Acquas · Firenze, IT
Stanly Jacob · Munich, DE
Marcelo DePaula Campos · Jaguariúna, BR

Key dates

Filing date	Jul 16, 2013
Grant date	Jul 14, 2015
Priority date	—
Expiry date	Jul 16, 2033

Classification

Technology area (CPC H)Electricity
CPC primaryH05B45/52
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

This invention relates to control circuits for LED systems with a feedback loop to regulate a drive voltage. A controller for the system is proposed comprising a plurality of LED circuits and a controllable power source. The controller comprises a control unit configured to cause regulation of the drive voltage based on a determination of a plurality of feedback voltages and a fault condition detecting means. At least one of the LED circuits is determined as having a fault condition if the respective feedback voltage is below a fault threshold. In response to a detected fault condition, a test voltage is applied to a cathode of the fault circuit to confirm the presence of a fault condition.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.