A PWM current-fed inverter for induction heating

Shu, Zhiqin (1992) A PWM current-fed inverter for induction heating. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (14MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

This thesis presents the description, analysis and implementation of a medium freqnency PWM current-fed inverter for induction heating applications. The feasibility of the application of a PWM scheme to the current-fed inverter in this particular field is investigated. The steady-state performance of the system is evaluated by a simulation program which is based on the state-space method of analysis. The analytical results by simulation are verified experimentally on a laboratory set-up of a power level of 100 watts at about 1 kHz. -- The current-fed PWM inverter is designed to achieve the goal of using a simpler control scheme to reduce the power losses and overall maintenance cost. It does not use a stage of controlled rectifier for the output regulation, which has the drawback of injecting large harmonics into the utility system. The overall control strategy is relatively simple, because the control loop does not include the input circuit of the system. The current-fed PWM inverter presented in this thesis shows the possibility of achieving output power regulation by means of both the swept-frequency method and the PWM scheme. A simple IC-based triggering circuit has been developed which can provide the required stable PWM signals in a range wide enough to achieve the goal of control.

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