| US 7,554,310 B2 | ||
| Digital double-loop output voltage regulation | ||
| Alain Chapuis, Riedikon (Switzerland); and Dennis R. Roark, Agoura, Calif. (US) | ||
| Assigned to Power-One, Inc., Camarillo, Calif. (US) | ||
| Filed on Feb. 06, 2007, as Appl. No. 11/671,889. | ||
| Application 11/671889 is a continuation in part of application No. 11/605045, filed on Nov. 27, 2006, granted, now 7,394,236. | ||
| Application 11/605045 is a continuation of application No. 11/084766, filed on Mar. 18, 2005, granted, now 7,141,956, filed on Nov. 28, 2006. | ||
| Prior Publication US 2007/0182391 A1, Aug. 09, 2007 | ||
| Int. Cl. G05F 1/46 (2006.01) | ||
| U.S. Cl. 323—282 [341/114] | 26 Claims |
| 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.
|