Sun, Ning2014-03-142014-03-141993etd-01242009-063207http://hdl.handle.net/10919/40742The theory of operation of a controlled transformer is described. A PWM controlled transformer is proposed and implemented in a forward converter to provide post regulation. Experimental results are presented to verify the new control scheme. Overall efficiency of 82%-86% is achieved in a 200khz, 500-watt, 5V-output off-line regulator. A discussion of design issues of the controlled transformer is also presented.xi, 130 leavesBTDapplication/pdfenIn CopyrightLD5655.V855 1993.S86Pulse transformers -- DesignPulse-duration modulationThesishttp://scholar.lib.vt.edu/theses/available/etd-01242009-063207/