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Digital double-loop output voltage regulation

  • US 7,554,310 B2
  • Filed: 02/06/2007
  • Issued: 06/30/2009
  • Est. Priority Date: 03/18/2005
  • Status: Active Grant
First Claim
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1. A voltage regulator comprising:

  • at least one power switch adapted to convey power between respective input and output terminals of said voltage regulator; and

    a digital controller adapted to control operation of said at least one power switch responsive to an output of said voltage regulator, said digital controller comprising;

    a first digital control loop including a first analog-to-digital converter providing a first digital measurement of said voltage regulator output, a digital filter providing a digital control output based on a first digital error signal and a second digital error signal, and a digital pulse width modulator providing a control signal to said at least one power switch based on said digital control output, the first digital error signal comprising a difference between the first digital measurement and a digital reference value, the second digital error signal comprising a sum of the first digital error signal and a time varying portion of the digital reference value; and

    a second digital control loop including a second analog-to-digital converter providing a second digital measurement of said voltage regulator output, said second analog-to-digital converter having greater resolution than said first analog-to-digital converter, said second digital control loop providing the digital reference value based on a desired output voltage setpoint, said second digital control loop providing said time varying portion of the digital reference value based on a difference between said second digital measurement and said output voltage setpoint.

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