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This paper deals with analysis and control of the heat distribution in zone-control induction heating (ZCIH) systems. A ZCIH system consists of two or more split working coils and inverter units, which enables to control the heat and/or temperature distribution on the workpiece by adjusting the current amplitude through each working coil. This paper carries out the theoretical analysis of the generated...
This document presents a method to synthesize an air-core transformer with a given inductance matrix. The proposed algorithm is used to design a two-winding transformer for a Φ2 resonant dc-dc converter operating in the VHF (30-300 MHz) regime. The method realizes the required inductance matrix to achieve proper tuning while trading volume and efficiency. Two sets of transformers were fabricated and...
In this paper, a soft switching interleaved boost converter for photovoltaic power generation system is proposed. It is a topology, which raises efficiency for DC-DC converter of photovoltaic PCS(Power Conditioning System). And it minimizes switching losses, input current ripple and output voltage ripple by adopting soft switching method using resonance. The detailed mode analysis of proposed topology...
This paper presents design considerations for grid connected photovoltaic inverters intended for use in industrial and commercial applications. Important aspects such as efficiency, reliability, construction constraints, control, standards and grid codes compliance are discussed. On the other hand, characteristics of a 600 V system based on Japanese standards and a 900 V system based on IEC standards...
In this paper, a battery-integrated boost converter for module-based series connected photovoltaic (PV) system is analyzed. Each PV module has its own battery and DC/DC converter. The converter achieves maximum power point tracking (MPPT) and battery charging. Application of proposed converter to module-based series connected PV system can maintain string voltage and save an additional voltage amplification...
A novel converter using three switching devices, which has a DC input and two single-phase AC outputs, is proposed. A PWM control scheme for the proposed converter is also described in this paper. Moreover, simulation verification of the proposed converter is conducted. As a result, it is shown that the proposed converter can convert electric power bidirectionally among a DC terminal and two AC terminals...
This paper describes the design and operation of a 6-kW, full-bridge, zero-voltage switching, bidirectional isolated dc-dc converter for a 2-kWh lithium-ion (Li-ion) bank that is considered attractive as an energy storage system for applications to photovoltaic generation systems ranging from 10 to 30 kW. The dc voltage at the high-voltage side of the converter is controlled from 305 to 355 V as the...
This paper describes a study improving mid-power snubber assisted zero voltage zero current transition (SAZZ) chopper by switched tail loss cancel circuit (TLC) for the electric vehicle (EV) and fuel cell electric vehicle (FCEV) application. The proposed topology offers a solution against tail loss increase problem when SAZZ soft switching topology is applied to mid-power range chopper design. Discharge...
In order to reduce size of bidirectional DC-DC converter, conventional topologies using hard switching method operate with high frequency. As switching frequency is getting higher, switching loss is increased. Conventionally an auxiliary circuit is implemented by using soft switching method in order to overcome this drawback,. The switch of the auxiliary circuit, however, is operated as hard switching...
This paper presents an approach of sparse matrix converter (SMC) using Z-source network. The SMC is implemented by connecting a controllable rectifier and the traditional inverter through a Z-source network. The Z-source can produce any desired output voltage by controlling the shoot-through time. Compare to the traditional three-phase SMC, the three-phase Z-source SMC has the same number of switches,...
This paper describes the design of a digital control for PWM current source rectifiers (CSRs) in the range of 1 - 10MVA. A cascaded control structure is proposed: the inner loop controls the grid currents and the outer loop controls the dc-link current. The proposed grid-current control combines state feedback for active damping of the LC-filter with a servo compensator to increase robustness and...
New constant-voltage constant-current ac power supply is presented. Our original Variable Capacitance Device is utilized in the power stage as linear reactance device. This circuit theoretically makes no distortion of output voltage waveform and a high efficiency can be obtained. For output voltage/current control and input power-factor correction, two Variable Capacitance Devices were employed as...
This paper presents an advanced integration approach for vertical power semiconductor devices. Based on recently demonstrated surface bump technology, it advances previous work by implementing a flip-chip stacking concept, which results in an improved solution for space exploitation, device performance optimization and assembly process simplification. As a case study, the design of a high-voltage...
Since a die-attach layer has significant impact on the thermal performance of a power module, its quality can be characterized using thermal performance. In this paper, a measurement system for thermal impedance is developed to evaluate three die-attach materials. Thanks to its high temperature sensitivity (10 mV/°C), the gate-emitter voltage of an IGBT is used as the temperature-sensitive parameter...
This paper presents drive performance possibilities of two types of brushless synchronous machine with wound-field excitation using SMC core for HEV applications. Both proposed machines have no brush or slip ring, but one uses a small amount of rare-earth magnet, it is called as hybrid excitation motor (HEM). The other has no magnet and employs only wound-field excitation. The structures and the basic...
A planar magnetic is a low profile transformer or inductor utilizing planar windings instead of the traditional windings made of Cu-wires. In this paper, the important factors for planar transformer design including winding loss, core loss, leakage inductance and stray capacitance have been investigated individually. The tradeoffs among these factors have to be analyzed in order to achieve optimal...
Renewable energy based micro grids are a better way of utilizing renewable power and reduce the usage of fossil fuels. Usage of energy storage becomes mandatory, when such micro-grids are used to supply quality power to the loads. However, it is difficult to meet the various needs from both the source and the load. The intermittent nature of renewable energy sources like PV demands usage of storage...
Smart grids offer a wide application domain for power electronics. In fact, every distributed energy resource (DER) includes an electronic power processor (Switching Power Interface, SPI) which controls the currents drawn from the grid and can be driven to optimize the power flow, improve voltage stability and increase distribution efficiency. For these aims, such distributed SPIs must perform cooperatively...
This paper presents a hysteresis based current control PWM named "Hi-PWM”, which has several advantages such as quick response of current, less fluctuation of switching frequency and less harmonic components. In this paper, the analysis of Hi-PWM applied railway traction system is explained. This paper also shows temperature and loss simulation of power device using Hi-PWM and experiment result...
This paper proposed a zero-current-switching pulsewidth-modulation (ZCS-PWM) forward dc/dc converter using a simple ZCS-PWM auxiliary circuit. The main switch and auxiliary switch operate at zero-current-switching turn on and turn off, and the all passive semiconductor devices in the proposed converter operate at zero-voltage-switching (ZVS) turn on and turn off. Besides operating at constant frequency...
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