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Small signal modeling of active-clamped zvs current-fed full-bridge isolated dc dc converter and control system implementation using p so-c
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Small-Signal Modeling of Active-Clamped ZVS
Current-Fed Full-Bridge Isolated DC/DC Converter
and Control System Implementation Using PSoC
Abstract
The small-signal analysis of an active-clamped zerovoltage- switching
current-fed isolated dc/dc converter is presented in this paper. State-space
averaging is used to derive the smallsignal model. A closed-loop controller is
designed to regulate the converter output over a wide range of power (1 : 10) and
source voltage (1 : 2) with fixed frequency duty cycle modulation. Bode plots are
presented using MATLAB and PSIM 9.0 to show the frequency response of the
converter with and without a controller. The designed controller is implemented
on the mixed-signal (analog and digital) processor Cypress Programmable Systemon-Chip (PSoC) 5. All components are integrated in Cypress PSoC 5 which is
compact, economical, and easily configurable. A 300-W converter prototype is
developed and tested with the implemented controller to observe the performance
of the system. Experimental results for step change in load for different input
voltage conditions show the high performance of the controller, satisfactory
transient performance of the converter, and voltage regulation with continued
safe operation.
Active-clamped ZVS current-fed full-bridge dc/dc converter.