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> Electromagnetic Induction Eddy Current-based Fluid-Heating Boiler using New High-Frequency Inverters for Super Heated Steamer  ABSTRACT  This Paper presents an innovative prototype of a new conceptual electromagnetic induction eddy-current-based fluid-heating appliance using two topological voltage-fed quasi resonant soft switching PWM high-frequency inverters using IGBTs which can operate at a constant frequency variable power regulation scheme. The promising cost effective high-efficient inverter-fed steam generator appliance for electromagnetic induction eddy-cnrrent-based fluid-heating in the pipeline systems is proposed, together with induction-heating-based steam generator, superheated steam generator, hot gas producer and metal catalyst heating for exhaust gas cleaning in engine, which are more suitable form a practical point of view.  The new product of induction-heated appliance using quasi-resonant ZVS-PFM high-frequency inverter using a single IGBT has been previously developed by the authors which uses the advanced IGBTs designed for soft-switching induction-heating and applied for cooking pan, rice cooker/warmer, fryer, steam generator, hot water producer, dryer and exhausted gas cleaner. Under these technological background, a novel electromagnetic induction eddy-current-based fluid heating incorporates metal package for fluid heating appliances applying two types of voltage-fed quasi-load resonant ZVS-PWM high-frequency inverter using IGBTs operating at a constant frequency variable power regulation scheme. The unique features of a novel electromagnetic induction eddy-current-based continuous fluid heating appliance using two types topologies ZVS-PWM high-frequency load resonant inverters; half bridge and active voltage clamped topologies are illustrated on the basis of simulation and discussed for the steady-state operating characteristics and experimental results.  Keywords: High-Frequency Inverter, Soft Switching, Asymmetrical PWM Scheme, Super Heated Steamer  1.INTRODUCTION  With tremendous advances in the latest power semiconductor switching devices such as MOSFETs, IGBTs, MCTs and SITs, high performance voltage source and current source type high frequency load resonant inverters for induction-heating power supplies have been widely applied for the forging, brazing, sealing, welding melting and heat treatment processing in industrial power processing plants. In recent years, the electromagnetic induction-based heat energy processing appliances in the pipeline systems which incorporates the voltage-fed series resonant type, current-fed parallel resonant type, voltage and current hybrid-fed resonant type and quasi-resonant type high-frequency inverters using the latest IGBT power modules have attracted special interest because of high efficiency, high reliability high safety, cleanliness, compactness in volumetric size, light in weight, rapid temperature response as well as stable temperature tracking and precise temperature controllability. The new consumer products of induction heating appliance using ZVS-PFM high-frequency resonant inverter using a single trench gate IGBTs designed for soft-switching, which are applied for cooking pan, rice cooker/warmer, hot water producer in household and business uses in consumer power electronics.  Under these technological backgrounds, an attractive electromagnetic induction-based flow-through metal package fluid-heating appliances using voltage-fed load resonant and quasi load resonant ZVS-PWM high-frequency inverter circuit topologies operating at a constant frequency variable power regulation (CFVP) scheme is originally proposed by the authors.  This paper presents a novel prototype of voltage source type high frequency quasi resonant inverter with asymmetrical PWM control scheme or duty cycle control scheme for electromagnetic induction eddy-current based continuous fluid heating in pipeline plants. Its operation principle and unique features of the newly-developed electromagnetic induction-based fluid heating appliance using voltage source type ZVS-PWM high frequency inverter using IGBTs are described and discussed on the basis of simulation and experimental results.  2\. INTERNAL ELECTROMAGNETIC INDUCTION-BASED FLUID HEATED APPLIANCE  This innovative induction heated fluid-heating appliance used for the industrial, chemical, and consumer pipeline systems is basically composed of cylindrical vessel made of non-magnetic stainless steel, litz wire for working coil and carbon ceramics as shown in Figure 2.  In carbon ceramics material, semi-coke and various types of ceramics are compounded, mixed and grounded on the basis of a special approach in cold isotonic pressing to many type of shapes, then burned and sintered more than 1500 degree centigrade. The material produced newly are able to be made into any form to best suit for application specific composite material such as induction eddy-current-based heater.  
  
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