Failure detection for power load string

Failure detection for power load string

  • CN 102,970,806 A
  • Filed: 08/30/2012
  • Published: 03/13/2013
  • Est. Priority Date: 08/30/2011
  • Status: Active Application
First Claim
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1. device for detection of the lighting apparatus internal fault that comprises a plurality of light-emitting diodes that are connected in series, described device comprises:

  • The first circuit node, second circuit node and tertiary circuit node, be used for connecting described lighting apparatus, be applied between described the first circuit node and the described second circuit node so that supply with the voltage of described a plurality of light-emitting diodes, and the first of power voltage drop is provided between described tertiary circuit node and the described second circuit node;

    AndAssessment unit, be coupled to described the first circuit node, described second circuit node and described tertiary circuit node, and be configured to estimate that the voltage that is presented on described tertiary circuit node is whether in the predefine margin of tolerance about nominal value, described nominal value is defined as being presented on the second portion of the supply voltage between described the first circuit node and the described second circuit nodeWherein, described second portion is predetermined to be so that when described lighting apparatus included only fault-free LED, described nominal value was substantially equal to be presented on the voltage of described tertiary circuit node.

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