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Method and apparatus for extending the power output range of a power converter used for a lighting system

  • US 9,246,378 B2
  • Filed: 07/19/2013
  • Issued: 01/26/2016
  • Est. Priority Date: 07/19/2013
  • Status: Expired due to Fees
First Claim
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1. A power conversion system with a delayed start time, comprising:

  • a voltage detector for receiving a rectified voltage; and

    comparing a reference voltage and the rectified voltage to generate an output signal when the rectified voltage exceeds the reference voltage;

    a delay timer configured to;

    receive the output signal and generate a sink signal and an enable signal;

    a power converter enabled by the enable output signal; and

    a current sink circuit comprising a transistor for drawing a sink current from a source of the rectified voltage and an analog switch comprising a switch output coupled to the gate of the transistor and inputs configured to receive the sink signal, the enable signal and a voltage signal;

    wherein the analog switch connects the switch output to a constant current when the power converter is not enabled and connects the switch output to a variable voltage circuit when the power converter is enabled.

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