Switching Mode Power Supply Expert System

An expert system for identifying switching mode power supply topologies.

Watkins-Johnson Converter

Name: Watkins-Johnson Converter

Classification: Single-inductor, two-state, no isolation

DC Gain: (2D-1)/D

Schematic:

Features:

Nonlinear Gain
Output same or opposite polarity as input
Voltage step-down same polarity
Voltage step-up or step-down with opposite polarity
Pulsating input and output current?
Right-half-plane (RHP) zero at some duty cycles, but the zeroes move into the left-half-plane (LHP) at other duty cycles
Switches: 2
Two winding inductor to save switches
Useful for DC to AC applications (step-down)

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Do not use this information for design without independent verification of the information.

Webmaster and editor: Jerrold Foutz, webmaster@smpstech.com

Original 02 May 1992, revised 14 September 2000