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DIGITAL CONTROLLER FOR SWITCH-MODE DC-DC CONVERTERS AND METHOD

  • US 20140117955A1
  • Filed: 10/30/2013
  • Published: 05/01/2014
  • Est. Priority Date: 11/01/2012
  • Status: Active Grant
First Claim
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1. A digital controller for a switch-mode DC-DC converter, the DC-DC converter having at least two switching elements and an LC circuit for producing an output voltage on an output of the DC-DC converter that is maintained at a desired level regardless of load changes that can occur on the output, the digital controller comprising:

  • an input stage configured to produce a difference signal between a reference voltage (Vref) and a feedback voltage (Vfbk) in a feedback loop of the DC-DC converter representative of the output voltage, wherein the input stage comprises one selected from the group consisting of (i) first and second delta-sigma-delta modulators and a subtractor, (ii) a delta-sigma-delta modulator and a subtractor, and (iii) a comparator;

    a proportional-integral-derivative (PID) compensator configured to process the difference signal to stabilize the feedback loop by compensating for an undesired phase shift introduced in the DC-DC converter output voltage by the LC circuit for large variations on a load on the output of the DC-DC converter, the load variations ranging from no load to just more than zero ohms, the PID compensator having an output for outputting a processed difference signal; and

    a digital sigma-delta modulator coupled to the PID compensator output configured to (i) generate at least one switching element control signal in response to the processed difference signal and (ii) output the at least one switching element control signal to a control input of at least one of the at least two switching elements for controlling a respective switching element of the DC-DC converter.

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