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This paper presents a division-summation (D-Σ) digital control for a three-phase bi-directional photovoltaic inverter with wide inductance variation. The bi-directional inverter fulfilling grid connection and rectification with power factor correction has been implemented in the laboratory. The proposed D-Σ approach summarizes the inductor-current variations over one switching cycle to derive control...
This paper overviews the recent technical trends in permanent magnet synchronous motors (PMSMs), especially the rare-earth less PMSMs in Japan. The rareearth less PMSMs including the PMSMs with reduced rareearth PMs, permanent magnet assisted synchronous motors with ferrite magnets and axial gap PMSMs with ferrite magnets are reviewed.
This paper describes expected effects and characteristics required for next-generation power devices to be used in home appliances and consumer electronics. This paper focuses on the challenges presented by the IH cooking heater, energy storage systems, and solar power generation system and presents the circuits that will solve these challenges. Also, requirements for power devices used for the circuits...
This paper presents an input switched multilevel inverter topology for controlling a three-phase open-end winding induction motor drive. In this topology, DC link voltage obtained from a single voltage source is divided into ‘n’ equal steps, and a single pole multi-throw (SPMT) configuration is used to select any desired voltage level from these possible ‘n’ voltage levels. This is followed by H-bridge...
This paper proposes the simple and seamless operation technique for bi-directional LLC resonant converter. Generally, bi-directional operation of LLC resonant converter is complicated and difficult to control. Because, the switching frequency has to be changed across fsr (series resonant frequency) and the switching sequences (the switching timing between high voltage side and low voltage side) has...
This paper describes fast analytical model for computation of the switched reluctance machine's (SRM) nonlinear magnetization characteristic and torque lookup table. The flux-tube and the gage-curve methods are used to develop this fast analytical model. Presented model is used for computation of the magnetization characteristic and torque lookup table of three and four-phase SRMs. The simulation...
This paper discusses the applicability of SiC MOSFET to high-frequency induction heating applications. In this paper, a 15-kW, 70-kHz SiC MOSFET inverter prototype is constructed to evaluate the performance of the SiC MOSFETs. Power loss breakdown is also conducted from the experimental results. As a results, the inverter prototype has exhibited a power conversion efficiency as high as 98.5% at the...
This paper presents a novel single phase switched reluctance motor (SRM) which can be directly driven by commercial AC power supply without any switching circuit and sensor. This proposed SRM is optimized based on a simple design technique. The optimized machine has aimed to be higher motor efficiency than conventional induction motors (IMs). In addition, the novel SRM can achieve the start-up with...
Wireless power transmission utilizing magnetic field resonance has been given increasing attention by power electronics engineers and industry. Actually, many technical papers that relate to the transmission coils of wireless power transmission based on magnetic field resonance have been published and verified the high-efficiency power transmission characteristics. However, the 10 MHz class high-frequency...
Modern lectures in power electronics should be complemented by interactive content, e.g. computer assisted learning via web-based applets or exercises employing a circuit simulator. The online e-learning system “iPES” was established in 2001; since then the iPES Java applets are frequently used in academia and industry to teach the basics of power electronics. This paper introduces new features of...
In recent years, an energy issue is becoming serious or severe. Therefore, power electronics technology is one of the key technologies since this technology can deal with electric energy efficiently, and some company tries to introduce this technology. Our company offers the opportunity to study this technology such as a circuit topology, designs of inductor or transformer with practical experiments...
This paper investigates the effect of demagnetization of the permanent magnets (PM) on the performance of interior permanent magnet motors. In order to remove the individual difference of the motors, several shapes of PMs are prepared, and the experiments are carried out with the same stator. This paper takes into account two types control strategy, V/f constant control and vector control. It is clarified...
This work presents the development and application of an electronically controlled harmonic mitigation device based on the insertion of active series harmonic impedances in the electric network. These active harmonic impedances are inserted at specific frequency (or frequencies). Important advantages of the proposed system are the reduced converter rating and the utilization of coaxial transformers...
This work considers an alternative method of reducing the body diode reverse recovery by taking advantage of the MOSFET body effect, and applying a bias voltage to the gate before reverse recovery. A test method is presented, allowing the accurate measurement of voltage and current waveforms during reverse recovery at high di/dt. Different bias voltages and dead times are combined, giving a loss map...
In this paper, the η-ρ (efficiency - power density) Pareto front of a 20 kVA Uninterruptible Power Supply (UPS), comprising a Si and SiC hybrid 3-level T-type rectifier and inverter stage, and input / output side filters, is determind. A multi-objective optimization procedure is detailed, which employs an electrical converter model and coupled electro-thermal component models. Each component model...
The surface barrier effect due to nickel (Ni) film on aluminum (Al) surface electrode of insulated gate bipolar transistor (IGBT) via power cycling (P/C) test at the maximal junction temperature (Tjmax) of 200 °C and thermal cycling (T/C) test in the −55 °C to 200 °C range has been carefully investigated. The difference of coefficient of thermal expansion (CTE) between Al and Ni and the stiffness...
The silicon carbide bipolar junction transistor (SiC-BJT) is a promising power semiconductor device for high efficient motor drive inverters. Especially with the very low on-state voltage drop and high switching speed it challenges the state of the art device - the silicon IGBT. The main disadvantage is the high driver loss in on-state compared to its voltage driven competitors, though. With the one-step...
The electrical loading and device rating are both important factors that determine the loss and thermal behaviors of power semiconductor devices. In the existing loss and thermal models, only the electrical loadings are focused and treated as design variables, while the device rating is normally pre-defined by experience with poor design flexibility. Consequently a more complete loss and thermal model...
An on-state collector-emitter voltage (Vce) measurement and thereby an estimation of average temperature in space for high power IGBT module is presented while power converter is in operation. The proposed measurement circuit is able to measure both high and low side IGBT and anti parallel diode voltages for a half bridge module which are also used to monitor the electrical degradation of the module...
It is revealed that plural loads should be driven connected in series to reduce an iron loss. In this research, three ring specimens as load are connected in series or in parallel and these rings are excited by a single phase PWM inverter. An iron loss on series connection becomes smaller than parallel connection because a minor loop on series connection which makes iron loss increase is smaller than...
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