Bishwajit Saha

Commercial Frequency AC to High Frequency AC Converter With Boost-Active Clamp Bridge Single Stage ZVS-PWM Inverter

This paper presents a novel soft-switching pulsewidth modulation (PWM) utility frequency ac to high frequency (HF) ac power conversion circuit incorporating boost-active clamp single stage inverter topology. This power converter is more suitable and acceptable for cost effective HF consumer induction heating applications. Its operating principle is presented using the switching mode equivalent circuits in addition to the operating voltage and current waveforms. The operating performances of this high frequency inverter using the latest insulated gate bipolar transistors are illustrated, which includes HFAC power regulation ranges and actual efficiency characteristics based on zero voltage soft switching operation ranges and the power dissipation loss analysis as compared with those of the previously developed high frequency inverter. In addition, a dual mode selected control scheme of this high frequency inverter based on a constant frequency asymmetrical PWM and pulse density modulation control scheme is discussed in this paper in order to extend the soft switching operation ranges and to improve the power conversion efficiency at the low power settings. The practical effectiveness of this power frequency converter is substantially proved on the basis of experimental results from practical design example.

An Advanced Simple Configuration Delta-Sigma Modulation Three-Phase Inverter Implementing Space Voltage Vector Approach

To miniaturize and enhance the performance of a variety type of switching mode inverters and converters, researchers have developed with great efforts so far. In these switching node converters, pulse width modulation (PWM) technique is commonly made use of voltage regulation. In case of using PWM processing scheme, noise peaks appear at the whole number of carrier frequency. And this causes bad influence to the electronic information, telecommunication, consumer and medical equipments near the converter. On the contrary, in case of applying a delta-sigma modulation scheme to switching power converters, no noise peaks appear in the high frequency bands. In this paper, an advanced three-phase delta-sigma modulation inverter introducing space voltage vector modulation scheme is presented and evaluated. Though the proposed modulation inverter consists of simple configuration, the proposed scheme can suppress noise level effectively with low switching operation number.

Commercial Frequency AC to High Frequency AC Converter with Boost-Active Clamp Bridge Single Stage ZVS-PWM Inverter

This paper presents a novel soft-switching PWM utility frequency AC to high frequency (HF) AC power conversion circuit incorporating boost-active clamp single stage inverter topology. This power converter is more suitable and acceptable for cost effective HF consumer induction heating (IH) applications. Its operating principle and the operation modes are presented using the switching mode equivalent circuits in addition to the operating voltage and current waveforms. The operating performances of this high frequency inverter using the latest IGBTs are illustrated, which includes HFAC power regulation ranges and actual efficiency characteristics based on zero voltage soft switching (ZVS) operation ranges and the power dissipation analysis as compared with those of the previously developed high frequency inverter. In addition, a dual mode selected control scheme of this high frequency inverter based on a constant frequency asymmetrical pulse width modulation (PWM) and pulse density modulation (PDM) control scheme is discussed in this paper in order to extend the soft switching operation ranges and to improve the power conversion efficiency at the low power settings. This power frequency converter practical effectiveness is substantially proved on the basis of experimental results from practical design example.

Single Reverse Blocking Switch Type Pulse Density Modulation Controlled ZVS Inverter with Boost Transformer for Dielectric Barrier Discharge Lamp Dimmer

This paper presents soft switching zero voltage switching high frequency inverter with reverse blocking single switch for dielectric barrier discharge lamp. The simple high-frequency inverter can completely achieve stable zero voltage soft switching (ZVS) commutation for wide its output power regulation ranges and load variations under its constant high frequency pulse density modulation (PDM) scheme. Its transient and steady state operating principle is originally described and discussed for a constant high-frequency PDM control strategy under a stable ZVS operation commutation, together with its output effective power regulation characteristics based on the high frequency PDM strategy. Its light dimming characteristics due to power regulation scheme are evaluated and discussed on the basis of simulation and experimental results. The feasible effectiveness of this high frequency inverter appliance implemented here is proven from the practical point of view

Utility Frequency AC to High Frequency AC Power Converter with Boost-Half Bridge Single Stage Circuit Topology

This paper presents a novel soft-switching PWM utility frequency AC to high frequency AC power conversion circuit incorporating boost-half bridge inverter topology, which is more suitable and acceptable for cost effective consumer induction heating applications. The operating principle and the operation modes are presented using the switching mode equivalent circuits and the operating voltage and current waveforms. The performances of this high-frequency inverter using the latest IGBTs are illustrated, which includes high frequency power regulation and actual efficiency characteristics based on zero voltage soft switching (ZVS) operation ranges and the power dissipation as compared with those of the previously developed high frequency inverter. In addition, a dual mode control scheme of this high frequency inverter based on asymmetrical pulse width modulation (PWM) and pulse density modulation (PDM) control scheme is discussed in this paper in order to extend the soft switching operation ranges and to improve the power conversion efficiency at the low power settings. The power converter practical effectiveness is substantially proved based on experimental results from practical design example.

Direct High Frequency Soft Switching Inverter Type AC-DC Power Converter with Boost Function for Consumer Magnetron Drive

The oscillation voltage (Ebm) is an important parameter of the characteristic constant of a high power microwave generator. When Ebm could be made high, it serves so as to improve the power conversion efficiency of a magnetron. Thus, the newly developed magnetron with 7% higher oscillation cut-off voltage than the present conventional one is manufactured by Matsushita Electric Industrial Co.Ltd, In addition to this, the utility AC power line current reduced harmonic type direct inverter AC-DC power converter suitable and acceptable for driving this magnetron is proposed in this paper. This direct high frequency inverter type soft switching PWM AC-DC converter has the voltage-boost function based on active clamp scheme with soft switching pulse modulation strategy topology. This paper describes a novel type active clamp AC-DC power converter circuit defined as direct high frequency inverter and the switching operation of this power converter is described and discussed on the basis of simulation and experimental results. The operating characteristics of this soft switching direct high frequency inverter type AC-DC power converter using IGBTs that incorporates the harmonic current improvement as well as power factor correction are evaluated and discussed from a practical point of view as compared with the conventional AC-DC power converter.

A single stage induction heating high frequency series load resonant ZVS-PWM inverter with active filtering pfc rectifier operating at one diode conduction and ZCS commutation

This paper presents newly developed half bridge ZVS-PWM high frequency inverter using ZCS-PFC converter conducting full bridge 1 diode. This high-frequency inverter is composed of a passive PFC converter operating at one diode conducting bridge circuit and asymmetrical ZVS-PWM high frequency resonant inverter without the bulky electrolytic capacitor stage for boosted DC voltage smoothing. In addition, this proposed high-frequency resonant inverter has only one diode conducting mode in the diode bridge rectifier with boost inductor. The operating principle of the proposed series load resonant high frequency inverter is described by using the switching mode equivalent circuits in addition to the simulated operating voltage and current waveforms. The circuit parameters of proposed high frequency inverter design to achieve one diode conduction at the same time at diode bridge part by simulation analysis in this paper. The operating performances of this proposed ZVS-PWM high-frequency inverter are also illustrated on the basis of simulation analysis which includes its UFAC-to-HFAC power regulation characteristics, soft switching operating range, UFAC side power factor characteristics and UFAC side line current harmonics characteristics by FFT analysis. In principle, the effectiveness of this UFAC-to-HFAC direct power frequency converter using IGBTs for consumer high-frequency IH appliances is evaluated and proved on the basis of simulation results.

Practical development of half-bridge high frequency PWM inverter-linked DC-DC converter with diode-clamped active edge resonant cells and extended topologies

This paper presents a new circuit prototype of two active edge resonant cells-assisted soft-switching symmetrical PWM half-bridge inverter type DC-DC high power converter employing a high frequency planar transformer with center-tapped secondary windings. Its operating principle is described in detail by using switching mode equivalent circuits which is determined under particular switching pulse pattern scheme, together with its unique features. The performance evaluations of its experimental setup are actually illustrated on the basis of the power loss analysis. The practical effectiveness of new isolated DC-DC converter treated here is proved for low voltage and large current DC output implementation. The extended circuit topologies of DC-DC converter treated here are also demonstrated for application specific equipments and discussed in this paper.

New Built-In Induction Heating Cooker Using High-Frequency ZVS-PWM Converter with Single Stage Circuit Topology

This paper presents a novel soft-switching PWM utility frequency AC to high frequency (HF) AC power conversion circuit incorporating boost-active clamp single stage inverter topology. This power converter is more suitable and acceptable for cost effective HF consumer induction heating (IH) applications. Its operating principle and the operation modes are presented using the switching mode equivalent circuits in addition to the operating voltage and current waveforms. The operating performances of this high frequency inverter using the latest IGBTs are illustrated, which includes HFAC power regulation ranges and actual efficiency characteristics based on zero voltage soft switching (ZVS) operation ranges and the power dissipation analysis as compared with those of the previously developed high frequency inverter. In addition, a dual mode selected control scheme of this high frequency inverter based on a constant frequency asymmetrical pulse width modulation (PWM) and pulse density modulation (PDM) control scheme is discussed in this paper in order to extend the soft switching operation ranges and to improve the power conversion efficiency at the low power settings. This power frequency converter practical effectiveness is substantially proved on the basis of experimental results from practical design example.

Dual PWM controlled soft switching high frequency IH load resonant inverter with lossless snubbing capacitor and switched capacitor

This paper presents a prototype of voltage-fed high-frequency IH load resonant inverter with lossless snubbing capacitor and resonant switched, along with its unique features. This high frequency soft commutation resonant inverter using IGBT power modules is developed for consumer induction heated cooking heater, steamer and super heated steamer. The operating principle of the high frequency resonant inverter proposed here in is illustrated my using periodic switching mode equivalent circuit. The voltage and current waveforms are verified through comparative simulation and observed results. Furthermore, the operating performances including high-frequency AC regulation and power conversion efficiency on the basis of dual duty cycle PWM scheme are discussed in experiment. The cost effectiveness of the proposed high frequency resonant soft-switching inverter is verified from a practical point of view.