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Digital double-loop output voltage regulation

  • US 7,394,236 B2
  • Filed: 11/27/2006
  • Issued: 07/01/2008
  • Est. Priority Date: 03/18/2005
  • Status: Active Grant
First Claim
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1. A controller for use in a voltage regulator having at least one power switch adapted to convey power between respective input and output terminals, the controller comprising:

  • a first digital control loop including a first analog-to-digital converter providing a first digital error signal representing a difference between a first output measurement of said voltage regulator and a reference value, a first digital filter providing a digital control output based on said first digital error signal, and a digital pulse width modulator providing a control signal to said at least one power switch, said control signal having a pulse width corresponding to said digital control output; and

    a second digital control loop including a second analog-to-digital converter providing a second output measurement of said voltage regulator, said second digital control loop providing a second digital error signal representing a difference between said second output measurement and said reference value, said second analog-to-digital converter having greater resolution than said first analog-to-digital converter, said second digital error signal being applied to said first digital control loop to improve accuracy of said first output measurement and thereby improve regulation of said voltage regulator.

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