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Systems and methods for high precision and/or low loss regulation of output currents of power conversion systems

  • US 10,211,740 B2
  • Filed: 02/09/2017
  • Issued: 02/19/2019
  • Est. Priority Date: 07/19/2013
  • Status: Active Grant
First Claim
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1. A system controller for regulating a power conversion system, the system controller comprising:

  • a first controller terminal configured to receive a first voltage associated with a first current, the first current being related to an input voltage of a power conversion system;

    a compensation component coupled to the first controller terminal and configured to, if the first voltage satisfies one or more first conditions, generate a compensation current based on at least information associated with the first current;

    a second controller terminal coupled to the compensation component and configured to provide a compensation voltage based on at least information associated with the compensation current, the compensation voltage being equal in magnitude to the compensation current multiplied by a compensation resistance, the compensation resistance being associated with a compensation resistor;

    a current sensing component configured to receive a second voltage and generate a first output signal, the second voltage being equal to a sum of a third voltage and the compensation voltage in magnitude, the third voltage being proportional to a second current flowing through a primary winding of the power conversion system; and

    an error amplifier configured to receive the first output signal and a first reference signal, generate an amplified signal based on at least information associated with the first output signal and the first reference signal, and output the amplified signal to affect a switch associated with the second current.

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