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info (at) bcarsten.com

Tel: (541) 745-3935
Fax: (541) 745-3923

6410 NW Sisters Pl.
Corvallis, OR 97330

SEMINAR5
SMPS FEEDBACK AND CONTROL

(Half day)

Most Switchmode designers are familiar with PWM or "voltage mode" control and one or two types of current mode control. However, there are more than a dozen distinct feedback and control methods available to regulate output voltage, including seven types of current mode control. There are also several little known but high performance "exotic" techniques, which can linearize the control function of boost and buck-boost topologies, and can often respond to line and load perturbations within one or two switching cycles. The basic circuit for each type of control method is shown, and the pros and cons of each type are discussed for various applications. Topics include:

CLASSICAL CONTROL APPROACHES

  • PWM or "voltage mode" control
  • Voltage hysteretic control

PRESENT FORMS OF CURRENT MODE CONTROL

  • Peak current control, constant frequency
  • Peak current control, constant "off" time
  • Valley current control, constant frequency
  • Valley current control, constant "on" time
  • Hysteretic current mode control
  • Average current mode control
  • PWM conductance control
  • Integrating inductor voltage for current sense

FEEDFORWARD TECHNIQUES

  • Input voltage feedforward in with PWM control
  • Output current feedforward with current mode control

"EXOTIC" AND POTENTIAL FUTURE CONTROL TECHNIQUES

  • Charge mode control
  • Energy mode control
  • Power mode control

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