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POWER CONVERTER CONTROLLER WITH ANALOG CONTROLLED VARIABLE CURRENT CIRCUIT

  • US 20160134187A1
  • Filed: 04/03/2015
  • Published: 05/12/2016
  • Est. Priority Date: 11/07/2014
  • Status: Active Grant
First Claim
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1. A bleeder controller for controlling a magnitude of a variable current conducted by bleeder circuitry between input terminals of a device, wherein the magnitude of the variable current is controllable in response to a control signal, the bleeder controller comprising:

  • a control signal output to be coupled to output the control signal to the bleeder circuitry;

    an input current sense input to be coupled to receive an input current sense signal representative of a current input into the input terminals of the device;

    an input voltage sense input to be coupled to receive an input voltage sense signal representative of a voltage across the input terminals of the device;

    a dimming detector to classify, based on at least one of the input current sense signal and the input voltage sense signal, a present half line cycle to the device as a leading-edge-dimmed half line cycle; and

    control signal circuitry to set the control signal that is output to the control signal output, the control signal circuitry comprising;

    timer circuitry to define;

    an initial time period after a leading edge of the leading-edge-dimmed half line cycle, anda subsequent time period after the initial time period, wherein the initial time period and the subsequent time period are both within the leading-edge-dimmed half line cycle; and

    one or more amplifiers to compare the input current sense signal with a first current threshold during the initial time period and with a second current threshold during the subsequent time period, wherein the second current threshold is lower than the first current threshold, and wherein the control signal circuitry sets the control signal in response to results of the comparisons to maintain the current input into the input terminals above the first current threshold during the initial time period and above the second current threshold during the subsequent time period.

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