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A BRIDGELESS BHB ZVS-PWM AC-AC CONVERTER FOR HIGH-FREQUENCY INDUCTION HEATING APPLICATIONS ABSTRACT: A new prototype of a zero voltage soft-switching (ZVS) utility frequency ac to highfrequency ac resonant power converter for induction heating (IH) applications is presented in this paper. The series resonant ac–ac converter proposed here in can process the frequency conversion without any diode bridge rectifier, thereby reducing the relevant conduction power losses. In addition, power factor correction (PFC) can be naturally achieved by the inductorbased boost half-bridge circuit with the non-smoothed dc-link. The operation principle together with an IH load power regulation scheme is described, and the converter performances including ZVS operations and PFC are demonstrated in an experiment with a 3.0-kW–30-kHz prototype by comparingit with the previously developed converter. Finally, the feasibilityof the proposed ac– ac converter is evaluated from a practical point of view. INTRODUCTION: Induction heating (IH) power supplies for domestic and industry applications have been advanced with a wide variety of circuit topologies featuring soft-switching technologiesin the past decades and now are getting into a new phaseof research and development pursuing for high-efficiency andcost-effective electric power conversion and processing. High efficiency, low harmonics, and high power factor areessentially demanded for the single-phase utility frequency ac(UFAC)–high-frequency ac (HFAC) power converter suitablefor commercial power IH applications. The typical powerconversion architecture for single-phase IH applications. consists of three-stage powerconverters: UFAC–dc diode bridge rectifier (DBR), power factorcorrection (PFC) converter (boost dc–dc converter), anddc–HF ac inverter. This circuit configuration is supported bythe well-established power converter topologies and has nowbeen the basic power processing scheme in the domestic andconsumer IH appliances. However, the multiple power conversionstages might lead to efficiency deterioration; consequently,the further development of the ac–ac converter for attaining ahigher power density could be obstructed. In order to improve the efficiency with a cost-effectivecircuit configuration, the two-stage DBR-assisted boost halfbridge(BHB) zero voltage soft-switching (ZVS)-PWM ac–acconverter, as illustrated in Fig. 2, has been proposed and commercialized [10]. In this two-stage ac–ac converter, thenon-smoothed dc (NSDC)–HFAC power processing can beperformed simultaneously in the HF inverter stage; therefore,high efficiency and cost reduction can be attained. However, theDBR connecting the UFAC power source with the HF resonantinverter is still demanded; thus, further improvement of thetotal efficiency cannot be expected in the DBRBHB ac–acconverter. A non-boost-type single-stage ac–ac converter has been proposed; however, the DBR is necessary, and costeffectivenessis still in a challenge. Other types of thesingle-stage ac–ac converter have been proposed by using bidirectional switches, but the reliability of this newtype of power device is not up to the practical level. Thecapacitor-boosted ac–ac converter that is free of the DBR,named as “bridgeless,” has been proposed; however,no active voltage regulation can be performed. As a solution for the technical challenge of the DBR-assistedBHB topology as well as the other existing converters for domesticand industrial IH applications, the innovative and costeffectivesingle-stage ZVS-PWM ac–ac converter with a seriesresonant tank-applied IH load is proposed in this paper. Theproposed ac–ac converter adopts the bridgeless BHB topologywith the NSDC-link, whereby the UFAC–HFAC power conversioncan be achieved with the passive PFC and the inductor assistedvoltage boost functions using insulated-gate bipolartransistors (IGBTs). An ac–ac converter with similar functions to the circuittopology proposed herein has been presented. However,this ac–ac converter is based on the series resonant HF inverterby using the dc-link divided capacitors as resonant elements, thereby possibly inducing larger current ripples in the HFinverter stage and relevant power losses of capacitors. On topof that, there is no concept of the NSDC-link, and the essentialperformances such as an actual power conversion efficiency,PFC operation, and ZVS range depending on the input-sidesource voltage level are not discussed in detail in the literature. EXISTING SYSTEM: In order to improve the efficiency with a cost-effective circuit configuration, the twostage DBR-assisted BHB ZVS- PWM ac-ac converter have been proposed and commercialized. In this two-stage ac-ac converter, the NSDC–HFAC power processing can be performed simultaneously in the HF inverter stage, thereby the high efficiency and cost reduction can be attained. However, the DBR connecting the UFAC power source with the HF resonant inverter is still demanded, thus further improvement of the total efficiency cannot be expected in the DBRBHB ac-ac converter PROPOSED SYSTEM: As a solution for the technical challenge of the DBR assisted BHB topology as well as the other existing converters for the domestic and industrial IH applications, the innovative and cost-effective single-stage ZVS-PWM ac-ac converter with a series-resonant tank-applied IH load is proposed in this paper. The proposed ac-ac converter adopts the bridgeless BHB topology with the NSDC-link, whereby the UFAC-HFAC power conversion can be achieved with the passive PFC and the inductor-assisted voltage boost functions using insulated-gate-bipolartransistors (IGBTs ADVANTAGES: Low distortion utility current BLOCK DIAGRAM: INPUT AC SUPPLY EMI FILTER BRIDGELESS BOOSTING CIRCUIT 12V DC 5V DC HALF BRIDGE RESONANT INVERTER LOAD DRIVER CIRCUIT PIC CONTROLLER WITH BUFFER TOOLS AND SOFTWARE USED: MPLAB – microcontroller programming. ORCAD – circuit layout. MATLAB/Simulink – Simulation APPLICATIONS: Domestic and industry applications. CONCLUSION: The practical effectiveness of the newly proposed ZVSPWMUFAC–HFAC converter has been demonstrated in thispaper. The operation principle of the single-stage ac–ac conversionwith voltage boost and PFC operations by BHB hasbeen explained in detail, and the ZVS characteristics have beendescribed. The design methodology of the circuit parametershas been presented by taking the wide range of ZVS and NSDClink-assisted PFC operations into account. REFERENCES: [1] T. Mishima and M. Nakaoka, “A load-power adaptive dual pulse modulatedcurrent phasorcontrolled ZVS high-frequency resonant inverter forinduction heating applications,” IEEE Trans. Power Electron., vol. 29,no. 6, pp. 3864–3880, Aug. 2014. [2] T. Mishima, C. Takami, and M. Nakaoka, “A new current phasorcontrolledZVS twin halfbridge high-frequency resonant inverterfor induction heating,” IEEE Trans. Ind. Electron., vol. 61, no. 5,pp. 2531–2545, May 2014. [3] B. Saha and R.-Y. Kim, “High power density series resonant inverter usingan auxiliary switched capacitor cell for induction heating applications,”IEEE Trans. Power Electron., vol. 29, no. 4, pp. 1909–1918, Apr. 2014. [4] S. Wang et al., “Induction-heated cooking appliance using new quasiresonantZVS-PWM inverter with power factor correction,” IEEE Trans.Ind. Appl., vol. 34, no. 4, pp. 705–712, Jul./Aug. 1998. [5] A. Okunoet al., “Feasible development of soft-switched SIT inverter withload-adaptive frequency-tracking control scheme for induction heating,”IEEE Trans. Ind. Appl., vol. 34, no. 4, pp. 713–718, Jul./Aug. 1998