Detection of a hazard condition of a load
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United States of America Patent
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Aug 29, 2017
Grant Date -
Jan 7, 2016
app pub date -
Feb 25, 2014
filing date -
Feb 27, 2013
priority date (Note) -
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Abstract
An electrical circuit is described for detection of an electrical hazard condition of a load 20, in particular of an OLED lighting element comprising driving terminals A, C. An electrical hazard condition, such as an overvoltage or short circuit is to be detected between terminals 22a, 22b of the circuit. A disabling element 24 is connected to one of the terminals 22a, 22b to disable the load. A monitoring circuit is connected to monitor a voltage V or current magnitude at at least one of the terminals 22a, 22b. The monitoring circuit comprises a maximum or minimum value detector 26 to deliver a maximum or minimum value Vmax of the voltage or current magnitude over time. The monitoring circuit is disposed to monitor the maximum or minimum value Vmax to detect the electrical hazard condition. A monitoring circuit is connected to activate the disabling element 24 if an electrical hazard condition is detected. The electrical circuit, a lighting arrangement including an LED or OLED lighting element and the electrical circuit, and a detection method allows to operate a load with different types of power supply, in particular also by PWM.
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