Series Resonant High Frequency Inverter Research Articles

A new approach for the stability analysis of high-frequency series resonant inverter-fitted induction heater

Abstract This paper presents a new approach for the stability analysis of a high-frequency series resonant inverter (HFSRI) in induction heating system. Here the mathematical analysis of HFSRI is described and the stability analysis is obtained by using MATLAB. The analytical method likely gradient method is also used to get stability of high frequency series resonant inverter. So the stability of high-frequency series resonant inverter is obtained and compared between MATLAB simulation output and gradient method output. From this simulation analysis and analytical analysis, the required specifications can be gratified so the appropriate influence of forward path gain and the feedback coefficient of the system are investigated. Hence, the system reliability of proposed topology is checked from the stability analysis of high frequency inverter circuit which is the heart of the induction heating system. More system stability indicates the higher reliability of the system.

High Power Density Multi-Mosfet-Based Series Resonant Inverter for Induction Heating Applications

Induction heating application uses uniquely high frequency series resonant inverter for achieving high conversion efficiency. The proposed work focus on improving the practical constraints in requiring the cooling arrangements necessary for switching devices used in resonant inverter due to higher switching and conduction losses. By introducing high frequency Multi- MOSFET based series resonant inverter for the application of induction heating with the following merits such as minimum switching and conduction losses using low voltage grade of automotive MOSFET’s and higher conversion efficiency with high frequency operation. By adding series combination of low voltage ratedMulti MOSFET switches, temperature variation according to the on-state resistance issues can be avoided by sharing the voltage across the switches depends on number switches connected in the bridge circuit without comprising existing system performance parameter such as THD, power factor, output power. Simulation results also presents to verify that the proposed system achieve higher converter efficiency.

Implementation and Simulation of High Frequency Series Resonant Inverter for Induction Heating Application

This project presents efficient “Full Bridge High Frequency Series Resonant Inverter for Induction Heating application”. In general, the induction-heating technique requires high-frequency current that is capable of inducing high-frequency eddy current in the work piece that results in heating. In this project series resonant inverter featuring soft switch on transitions is used. A cost-effective active snubber circuit is used to optimize the switch off transition. Active snubber uses active components. This allows the converter to operate under a wide range of operating conditions. The series resonant inverter consists of resonant circuit and it delivers maximum power to the load at resonant frequency. The inverter system is designed and the simulation is done using Matlab.

Hysteresis Current Control with Input Filter Design for High Frequency Series Resonant Full Bridge Inverter

This paper talks about the analysis of a high frequency series resonant inverter for using domestic and industrial induction heating purpose. It is a technique i.e. used for heat conductive materials hard and soft metals. Series Resonant inverters which operate at high frequency preferable for induction heating which normally works in 5-55KHz. High frequency series resonant inverters which is made up of Insulated Gate Bipolar Transistor (IGBT). Power control is obtained by Hysteresis Current Control and filter design is incorporated in the input power supply. Soft switching techniques is performed which minimizes switching losses and proper filter design minimizes harmonic injection in the power supply.

Novel ZCS-PFM Series Resonant High Frequency Inverter for Electromagnetic Induction Eddy Current-Heated Roller

This paper presents a novel prototype of zero current switching pulse frequency modulation (ZCS-PFM )high frequency series resonant inverter using IGBT power module for electromagnetic induction eddy current heated roller in copy and printing machines. The operating principle and unique features of this voltage-fed half bridge inverter with two additional soft commutation inductor snubber are presented including the transformer modeling of induction heated rolling drum This soft switching inverter can achieve stable zero current soft commutation under a discontinuous and continuous resonant load current for a widely specified power regulation processing. The experimental results and computer-aided analysis of this inverter are discussed from a practical point of view.

Zero Current Soft-Switching High Frequency Inverter with PDM Control Scheme for Induction Heating Roller

This paper presents an inductor snubber -assisted high frequency series resonant inverter for induction eddy current-heated roller in copy and printing machines, which can achieve ZCS and wide power regulation under constant frequency pulse density modulation. Its operating principle is presented, together with its output power regulation characteristics.

Pulse Density Modulated High Frequency Inverter for Silent Discharge Excimer Lamp Drive

This paper presents a single inductor snubber-assisted full bridge type high frequency series resonant inverter using MOSFETs for the silent discharge type excimer lamp drive, which can achieve ZCS commutation. Its operating principle is presented, together with its output power regulation characteristicsbased on pulse density modulation.

Feasible development of soft-switched SIT inverter with load-adaptive frequency-tracking control scheme for induction heating

This paper describes the latest feasible developments of a voltage-source-type series-capacitor-commutated load-resonant high-frequency bridge inverter using static induction transistors (SITs) for industrial induction-heating and melting applications. A load-adaptive variable-frequency tuned controller, composed of a phase-locked loop integrated circuit (PLLIC) device, a pulse amplitude modulation (PAM) power controller employing a phase-controlled AC/DC converter, and protective control schemes for overvoltage and/or overcurrent generation, is also demonstrated for this series resonant inverter. In addition to these, a short-circuit test of a high-power SIT incorporated into the bridge leg high-frequency series resonant inverter is carried out from a practical point of view and evaluated, in order to obtain important design data considering reliable switching characteristics of large-capacity SITs and to realize cost-effective protective circuits for SITs.

Improved pulse density modulation for high-frequency series resonant inverter with transformer-coupled load

An improved method to determine the pulse density modulation (PDM) pattern is proposed for the high-frequency series resonant inverter (SRI) with a loadmatching transformer. A simple discrete-time model of SRI is derived and the constraints given by a load-matching transformer are analysed. Using the model and constraints, the optimal PDM pattern is derived. The output current ripple is much reduced with this method and the transformer saturation problem can also be avoided. The results of a prototype experiment verify that the unwanted spectral component in the output current is effectively decreased by the optimal pattern. It is believed that the proposed technique is useful for practical applications such as the high-frequency power supply of an induction heating system.

Analysis and design of a high-frequency high-power series resonant inverter using asymmetrical thyristors

The description, analysis, and design of a high-frequency series resonant inverter are presented. A detailed analysis is given that includes the effect of di/dt inductor and snubber components. Steady-state characteristics of the inverter are presented, and equivalent circuits and expressions to determine switching transients are derived. A design example of a 150-kW, 50-kHz inverter is presented to illustrate the design of a high-frequency series resonant inverter. Finally, the experimental verification of theoretical results is provided.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>