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Negative current sensing method for multi-channel LED driver

  • US 9,693,404 B1
  • Filed: 09/15/2016
  • Issued: 06/27/2017
  • Est. Priority Date: 10/07/2015
  • Status: Active Grant
First Claim
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1. A multi-channel power supply comprising:

  • first and second power converters configured to drive respective first and second lighting sources, each of the first and second power converters respectively comprisinga first stage configured to provide current through a primary winding of an isolation transformer;

    a second stage havingan energy storage device coupled in parallel with a secondary winding of the isolation transformer,a current sensing resistor coupled on a first end to the secondary winding and on a second end to a circuit ground for the second stage, anda filtering circuit coupled on a first end to a node between the secondary winding and the current sensing resistor, and on a second end to the circuit ground; and

    a feedback circuit coupled between the first stage and the filtering circuit, and configured to deliver a control signal to the first stage corresponding to a current through the secondary winding.

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