Sang-Pil Mun

High-frequency resonant matrix converter using one-chip reverse blocking IGBT-Based bidirectional switches for induction heating

This paper deals with a novel type soft switching utility frequency AC-high frequency AC converter using asymmetrical PWM bidirectional active switches which can be defined as high frequency resonant matrix converter. This power frequency changer can directly convert utility frequency AC power to high frequency AC power ranging more than 20 kHz up to 100 kHz. Only one active edge resonant capacitor-assisted soft switching high frequency load resonant cyclo-converter is based on asymmetrical duty cycle PWM strategy. This high frequency cyclo-converter uses bidirectional IGBTs composed of anti-parallel one-chip reverse blocking IGBTs. This high frequency cyclo-converter has some remarkable features as electrolytic capacitorless DC busline link, unity power factor correction and sinewave line current shaping, simple configuration with minimum circuit components and low cost, high efficiency and downsizing. This series load resonant cyclo- converter incorporating bidirectional active power switches is developed and implemented for high efficiency consumer induction heated food cooking appliances. Its operating principle is described by using equivalent circuits. Its operating performances as soft switching operating ranges and high frequency effective power regulation characteristics are discussed on the basis of simulation and experimental results.

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.

Direct AC-AC resonant converter using one-chip reverse blocking IGBT-based bidirectional switches for HF induction heaters

This paper deals with a novel type soft switching utility frequency AC- high frequency AC converter using asymmetrical PWM bidirectional active switches which can be defined as high frequency resonant matrix converter. This power frequency changer can directly convert utility frequency AC power to high frequency AC power ranging more than 20 kHz up to 100 kHz. Only one active edge resonant capacitor-assisted soft switching high frequency load resonant cyclo-converter is based on asymmetrical duty cycle PWM strategy. This high frequency cyclo-converter uses bidirectional IGBTs composed of anti-parallel one-chip reverse blocking IGBTs. This high frequency cyclo-converter has some remarkable features as electrolytic capacitorless DC busline link, unity power factor correction and sinewave line current shaping, simple configuration with minimum circuit components and low cost, high efficiency and downsizing. This series load resonant cyclo-converter incorporating bidirectional active power switches is developed and implemented for high efficiency consumer induction heated food cooking appliances. Its operating principle is described by using equivalent circuits. Its operating performances as soft switching operating ranges and high frequency effective power regulation characteristics are discussed on the basis of simulation and experimental results.

Three-Level Phase Shifted soft transition PWM DCDC power converter with high frequency link for arc welders and its extended version

This paper presents some experimental results and practical evaluations of neutral point clamping and flying capacitor hybrid three-level phase shifted soft switching PWM DC-DC high power converter with high frequency transformer and center-tapped rectifier. This new DC-DC converter developed for TIG, MIG and MAG arc welders is implemented by modifying the high-frequency-linked HB soft switching PWM DC-DC power converter with high side and low side two active edge resonant modular, which is proposed by the authors. The operating principle of the three-level soft-switching PWM DC-DC converter and its experimental and simulation results including phase-shifted angle vs. power regulation characteristics and power conversion efficiency characteristics in addition to power loss analysis are illustrated and discussed from a practical point of view, along with the remarkable advantageous points as compared with previously-developed soft switching PWM DC-DC converter. Finally, the improved three-level soft switching PWM converter version is also considered to suppress the circulating current due to phase shift pulse modulation principle. The PWM and PDM dual pulse modulation strategy is considered to extend its soft switching transition operation range.

High-Frequency Zero Current Soft Switching Inverter with Pulse Density Modulation for Induction Heated Roller

This paper presents a voltage source type half-bridge series resonant high frequency (HF) inverter for induction heated fixing roller in copy machines. This high-frequency inverter works under zero current soft switching (ZCS) commutation and has wide power regulation range due to employing a pulse density modulation (PDM) scheme. Transient and steady state operating modes of the inverter are presented in this paper together with its PDM-based power regulation system Experimental operating performances of the developed HF-ZCS inverter as well as power losses and actual efficiency are discussed and compared with computer simulation results.

Three-level phase shift ZVS-PWM DC-DC converter with neutral point clamping diodes and flying capacitor for gas metal arc welding

This paper is concerned with some experimental results and practical evaluations of a three-level phase shifted ZVS-PWM DC-DC converter with neutral point clamping diodes and flying capacitor for a variety of gas metal arc welding machines. This new DC-DC converter suitable for high power applications is implemented by modifying the high-frequency-linked half bridge soft switching PWM DC-DC converter with two active edge resonant cells in high side and low side DC rails, which is previously-developed put into practice by the authors. The operating principle of the three-level phase-shift ZVS-PWM DC-DC converter and its experimental and simulation results including power regulation characteristics vs. phase-shifted angle and power conversion efficiency characteristics in addition to power loss analysis are illustrated and evaluated comparatively from a practical point of view, along with the remarkable advantageous features as compared with previously-developed one.

A novel one stage ZVS-PWM high frequency resonant inverter with boost single diode conducting mode passive ZCS-PFC scheme

This paper presents a high-efficiency one stage ZVS-PWM resonant single-ended push-pull (SEPP) high frequency inverter with new PFC functional scheme. This high-frequency resonant power converter with lossless snubbing capacitors which is composed of a passive PFC converter operating at one diode conducting full bridge circuit mode consists of asymmetrical ZVS-PWM high frequency inverter with non-bulky electrolytic capacitor stage for DC boosted voltage smoothing and induction heated load with tuned capacitor, and boost inductor between HFAC side and mid point of. The periodic steady-state operating principle of one stage high frequency series load resonant inverter with lossless capacitor is described by using the switching mode equivalent circuits in addition to the simulated operating voltage and current waveforms. The operating performances of this high-frequency ZVS-PWM resonant inverter with lossless snubbing capacitors 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 line current harmonics characteristics by FFT analysis. In principle, the effectiveness of this UFAC-to-HFAC direct power frequency converter designed for consumer high-frequency III appliances is evaluated and proved on the basis of simulation results.

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.

Three-level phase shifted ZVS-PWM DC-DC converter with neutral point diodes clamping and flying capacitor

This paper presents some experimental results and practical evaluations of neutral point clamping and flying capacitor hybrid three-level phase shifted soft switching PWM DC-DC high power converter with high frequency transformer and center-tapped rectifier. This new DC-DC converter developed for TIG, MIG and MAG arc welders is implemented by modifying the high-frequency-linked HB soft switching PWM DC-DC power converter with high side and low side two active edge resonant modular, which is proposed by the authors. The operating principle of the three-level soft-switching PWM DC-DC converter and its experimental and simulation results including phase-shifted angle vs. power regulation characteristics and power conversion efficiency characteristics in addition to power loss analysis are illustrated and discussed from a practical point of view, along with the remarkable advantageous points as compared with previously-developed soft switching PWM DC-DC converter. Finally, the improved three-level soft switching PWM converter version is also considered to suppress the circulating current due to phase shift pulse modulation principle. The PWM and PDM dual pulse modulation strategy is considered to extend its soft switching transition operation range.

Interleaved ZCS boost DC-DC converters with coupled inductor using active edge resonant switch blocks for PV interface

This paper presents 2 active edge resonant cell interleaved boost DC-DC converter. It uses two feedback loops including similar to current mode control with one slow outer loop and the other for faster inner PWM control loop. To improve the transient response of the 2-cell assisted ZCS boost converter system, a coupled inductor of energy storage inductors is used on the basis of interleave architecture. This integrated magnetic design structure reduces size as well as weight and improves the converter performance due to both steady-state and transient. The effectiveness of the proposed converter and control scheme is demonstrated through PSIM simulations.