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Systems and methods for regulating output currents of power conversion systems

  • US 9,991,802 B2
  • Filed: 11/28/2016
  • Issued: 06/05/2018
  • Est. Priority Date: 04/18/2014
  • Status: Active Grant
First Claim
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1. A system for a power converter, the system comprising:

  • a comparator configured to receive a ramping signal and a compensation signal and output a comparison signal based at least in part on the ramping signal and the compensation signal, the ramping signal being associated with a jittering signal and corresponding to a ramping slope, the jittering signal being associated with multiple jittering cycles corresponding to a predetermined jittering frequency related to a predetermined jittering period, the compensation signal being associated with a current flowing through a primary winding of a power converter; and

    a driver configured to generate a drive signal based at least in part on the comparison signal and output the drive signal to a switch to affect the current, the drive signal being associated with multiple modulation cycles corresponding to a modulation frequency related to a modulation period;

    wherein the system is further configured to;

    change the ramping slope based at least in part on the jittering signal so that, within a same jittering cycle of the multiple jittering cycles, the ramping slope is changed by different magnitudes corresponding to the multiple modulation cycles respectively; and

    adjust the modulation frequency based at least in part on the changed ramping slope.

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