Average current-mode control scheme for a quadratic buck converter with a single switch Article uri icon

abstract

  • A controller for a quadratic buck converter is given using average current-mode control. The converter has two LC filters; thus, it will exhibit fourth-order characteristic dynamics. The proposed scheme employs an inner loop that uses the current of the first inductor. This current can also be used for overload protection; therefore, the full benefits of current-mode control are maintained. For the outer loop, a conventional controller which provides good regulation characteristics is used. The design-oriented analytic results allow the designer to easily pinpoint the control circuit parameters that optimize the converter%27s performance. Experimental results are given for a 28 W switching regulator where current-mode control and voltage-mode control are compared. © 2007 IEEE.
  • A controller for a quadratic buck converter is given using average current-mode control. The converter has two LC filters; thus, it will exhibit fourth-order characteristic dynamics. The proposed scheme employs an inner loop that uses the current of the first inductor. This current can also be used for overload protection; therefore, the full benefits of current-mode control are maintained. For the outer loop, a conventional controller which provides good regulation characteristics is used. The design-oriented analytic results allow the designer to easily pinpoint the control circuit parameters that optimize the converter's performance. Experimental results are given for a 28 W switching regulator where current-mode control and voltage-mode control are compared. © 2007 IEEE.

publication date

  • 2008-01-01