A Soft-switching single-phase single-stage AC-to DC converter with low line current harmonic distortion

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dc.contributor.authorVenkatraman, Ramakrishnanen_US
dc.date.accessioned2024-08-15T20:11:52Z
dc.date.available2024-08-15T20:11:52Z
dc.date.copyright1998en_US
dc.date.issued1998
dc.degree.departmentDepartment of Electrical and Computer Engineering
dc.degree.levelMaster of Applied Science M.A.Sc.en
dc.description.abstractThis thesis presents the steady-state and dynamic analysis of a soft-switching single­ phase, single-stage high frequency (HF) transformer isolated ac-to-dc converter with low line current harmonic distortion. The converter topology integrates a discon­tinuous conduction mode (DCM) boost converter and a soft-switching asymmetrical pulse-width-modulated (PWM) constant frequency de-to-de converter. The steady-state operation of the converter is explained with equivalent circuits for various intervals of operation. Design curves are obtained based on steady-state analysis. The design procedure is illustrated with an example. Detailed PSPICE simulation results and experimental results obtained from a 500 W, 48 V output lab­oratory prototype are given to verify theory. The measured total harmonic distortion (THD) of the line current is between 9.5% to 28% for the complete operating range of load and line voltage. Zero-voltage-switching (ZVS) is maintained for the complete operating range. Small-signal analysis of the ac-to-dc converter is done based on the state averag­ing technique. Control-to-output and line-to-output transfer functions are obtained. Control-to-output transfer function indicates that the duty cycle has to be restricted to 0.5 to obtain fast regulation of output voltage. PSPICE simulation results are compared with the theoretically obtained frequency response of the control-to-output transfer function. A feedback loop network is designed to regulate the output voltage. Discrete-time large signal analysis is presented to study the closed-loop behaviour of the converter for typical line and load transients. The output voltage recovers within 1 ms for 50% load transients. Theoretical results are verified with PSPICE simulation. Experimental results for load transients are given.
dc.format.extent214 pages
dc.identifier.urihttps://hdl.handle.net/1828/19987
dc.rightsAvailable to the World Wide Weben_US
dc.titleA Soft-switching single-phase single-stage AC-to DC converter with low line current harmonic distortionen_US
dc.typeThesisen_US

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