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This paper presents the design, fabrication, and characterization of on silicon integrated micro-transformers for high frequency power applications. The microtransformer device is used and tested in DC-DC converter application at high switching frequency. This device has stable L vs. f characteristic up to 50 MHz. The design is improved regarding to the electrical resistance and current capability...
The well-known active power-frequency and reactive power-voltage amplitude droop control is widely used in the coordinative control of parallel inverters in Microgrids. However, this conventional droop method may cause deviation on the frequency and voltage amplitude, which will affect the accuracy of power supply. This paper proposes a novel secondary control method to compensate this deviation....
Fuel cell is a promising source in autonomous dc microgrid. Hybridization of fuel cell with battery is commonly implemented to overcome slow dynamic of fuel cell. Then battery compensates high frequency fluctuation and fuel cell provides consistent power at steady state. To achieve this objective, most control strategies require a centralized controller, which encounter reliability and scalability...
Auxiliary source bond wires and connections are widely used to in the power module with paralleled MOSFETs or IGBTs. This paper investigates the working mechanism and the effects of the auxiliary source connections in multichip power modules. It reveals that the auxiliary source connections cannot totally decouple the power loop and the gate loop like how the Kelvin source connection does, because...
The layout of power modules is one of the key points in power module design. In this paper, along with design examples, an improved automatic layout method for planar power module is presented. Some practical considerations and implementations are introduced in the optimization procedure.
This paper introduces the development and experimental performance of SiC-Based high power density inverter. The Power density of the developed inverter is about 70kW/litter in volumetric, 50kW/kg in gravimetric. The inverter is forced air cooled 2-level voltage source inverter. In order to achieve higher power density than conventional inverters, we need to reduce losses of inverters or improve cooling...
Current trends in power distribution systems are focused on distributed architectures instead of centralized approach. Distributed architectures are more complex since a network of power electronic converters is required to distribute power with appropriate performance. One of the main issues deals with the control loop design of the converters when they are loaded by other converters downstream....
In this study, a new perspective yet practical method is proposed for measuring speed of an Electric Power Steering (EPS) drive motor by using a magnetic encoder. The reason that the EPS system measures the speed of a motor is not only to check the speed of the motor, but also to perform control logic of the motor based on the measured speed. Thus, it is important to measure the speed of a motor at...
This paper introduces a low-complexity, novel dynamic measurement technique to extract Ciss and Crss of a power MOSFET under high current conduction, providing an accurate description of the transistor dynamic characteristics while hard-switching an inductive load. The results of our dynamic measurements revealed larger capacitance values when compared to those extracted from conventional static measurements.
Wireless power transfer (WPT) technology is now recognized as an efficient means of transferring power because having numerous advantages over conventional wired power transfer system. The phase delays, for example induced in the sampling process, the algorithm implementation process, the signal transduction process, etc. are widely found during the implementation of WPT system, which significantly...
This paper describes the design and evaluation of high current toroidal Printed Circuit Board (PCB) embedded inductor applicable for high frequency DC/AC converters (lower than 10MHz). The equivalent circuit model of the inductor is presented and the filtering effectiveness is verified by testing three different geometries with its own characteristics and function through a GaN converter. Besides,...
Thermal cycling stress is one of the most potential factors challenging the reliability/lifetime of semiconductor devices and cause of their failures. This paper analyzes and investigates the impacts of various control strategies on thermal cycling stress of the semiconductor devices of the Modular Multilevel Converter (MMC) for drive applications. Various control strategies based on injecting a common-mode...
The design of power converters becomes a challenge especially when several objectives and critical factors have to be considered, like high efficiency, high power density, cost and reliability. This paper addresses this issue for the design of PFC rectifier. The design is constructed as a bi-objectives optimization. The focus is set on efficiency and power density as principal targets. Then using...
There is a need to improve the power quality of the grid as well as the power factor implied on the grid due to the nonlinear loads connected to it. A new single phase bridgeless AC/DC power factor correction (PFC) topology to improve the power factor as well as the total harmonic distortion (THD) of the utility grid is proposed in this research. By eliminating the input bridge in conventional PFC...
Cascaded H-bridge multilevel inverters (CHB-MLIs) are well accepted for medium and high power grid connected photovoltaic (PV) applications. Independent MPPT and modularity are the advantages of these converters over the diode clamped and capacitor clamped MLIs. However, CHB-MLIs are associated with inter-module leakage current through the parasitic capacitor of PV panels even though an isolation...
This paper presents an isolated power converter module for medium-voltage (2.4 kV), high-power-quality (PF ≥ 0.98, current THD ≤ 2%), 50 kW fast charger for plug-in electric vehicles. The proposed high-efficiency (above 96%), and reduced-footprint converter module utilizes off-the-shelf Silicon Carbide (SiC) devices to step down the rectified single-phase medium-voltage input. The developed module...
Grid-connected inverters (GCIs) are power electronics interfaces to connect distributed energy resources into the grid. In order to improve the performance of distributed energy resources as well as maintain the high power quality of the grid, it is important to understand the characteristic of GCIs with appropriate controllers depending on its applications. This paper presents a study on the effect...
By modeling the typical electromechanical transient of grid-tied PWM inverters, this paper firstly proves that PWM inverters and Rotational Synchronous Generators (RSGs) are similar in physical mechanism and equivalent in mathematical model, and the concept of Static Synchronous Generator (SSG) is thereby developed. Furthermore, the rationality and feasibility of migrating the concepts, tools and...
Open-end winding topology with a common DC source has path for zero-sequence current. Zero-sequence current needs to be suppressed because it does not contribute to the drive torque but has harmful effects such as loss and torque ripple. Both inverter and motor have sources of the zero-sequence component. The zero-sequence source on the inverter side is the voltage error due to dead time in switching...
Pulse skipping modulation (PSM) helps to improve the light-load efficiency in a DC-DC converter with a stable periodic behaviour and predictable ripple parameters. A periodic steady-state operation under PSM consists of a charge pulse followed by a pre-defined count of skipped pulses, where individual pulses are referred to a fixed-frequency clock with a time period T. Thus the overall time period...
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