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In this work a model of the oscillator with inductive coupling of the gates operating at ultralow voltage is presented and experimentally verified. The topology needs a bias voltage at the gates, and we propose a circuit called starting block to generate this voltage from the supply. Theoretical behavior is compared with experimental results, showing good agreement. The circuit, which behaves as astable...
Li Ion batteries are the proficient energy source for powering Hybrid Electric Vehicles (HEV) due to its smaller size, lighter weight, and improved charge efficiency without memory effect. The battery pack constitutes of a combination of cells in series and parallel configurations. Due to cell impedance mismatch, each cell possesses different potentials which cause different State of Charge (SOC)...
With the increase of operating frequencies of switching devices, the size and weight of power converters are reduced. However, the impact of parasitic parameters becomes significant, which affects the performance of power converters. Compared with a simple equivalent circuit of filtering inductors, a detailed lumped circuit model is more suitable for the study of the behaviour of the inductor at high...
For the excellent electrical performance, Gallium Nitride (GaN) new-type semiconductor devices are preferred in high voltage, high frequency and high power applications. However, GaN devices have low on-resistance and the loop layout requires low damping in high frequency loop. These both can lead to voltage and current oscillations under high frequency and even cause uncontrollable oscillations,...
Simulation of power converters is particularly necessary in the automotive industry where the requirements for rapid development and the right choice of components allow reducing design time and allowing engineers to verify by more simulations many of the preliminary versions of the electronic power schemes. In this paper we present the simulation of the back 48 to 14V converter required nowadays...
Voltage Balance of the series-connected dc-link capacitors is the key problem of three-level diode-clamped converters. In this paper, an auxiliary voltage balance circuit (VBC) is presented to maintain the voltage balance of dc-link capacitors. The voltage balance circuit consists of a clamping capacitor and a current-limiting inductor. With the clamping capacitor, the voltage stresses of the auxiliary...
This paper presents the systematic design and performance of two controls for half-bridge converters with LCL output filters based on a similarity transformation. This type of converters is commonly used in, for example, grid or battery interfaces. Both controls feature active damping, i.e. filter resonances are damped through software and not by using passive resistors. Moreover, both controls are...
This paper presents experimental validation of a high-fidelity toroid inductor modeling technique. The aim of this research is to accurately model the instantaneous magnetization state and core losses in ferromagnetic materials. Quasi-static hysteresis effects are captured using a Preisach model. Eddy currents are included by coupling the associated quasi-static Everett function to a simple finite...
The difficulty of modeling a resonant converter is the fact that, unlike a pulse-width-modulation (PWM) converter, an average concept doesn't work. The only successful equivalent circuit model, proposed by E. Yang, is based on fundamental approximation and harmonic balance theory. However, it is conceptually hard to understand because of an unidentified “equilibrium state.” A resonant converter was...
In designing a human-computer interface (interface for short) for a complex work domain, the first question to be answered is what information should be presented on an interface media. The simplest answer is: it depends on tasks to be performed by the human operator. In the past two decades, two methodologies have been developed with a purpose to answer this question, namely Abstraction Hierarchy...
Ferrite chokes are often applied to suppress electromagnetic interference (EMI) in power converters. In this paper, an improved ferrite choke RLC model and its parameters determination method are proposed. The improved ferrite choke RLC model can overcome the limitation of the existing RLC model in the low frequency band, and the proposed parameters determination method can calculate the values of...
This paper presents a new four-quadrant bridgeless boost type rectifier with the use of Active Virtual Ground (AVG) technology. The presented topology can step up the AC grid voltage to a regulated DC voltage under a stable bidirectional current flow with real power or reactive power delivery. By using bridgeless rectifier configuration and 3-level switching method, only two high frequency switches...
This paper illustrates a study on dynamic modelling of a large scale solar powered water pumping system for irrigation in Saudi Arabia. The system is expected to deliver 245 m3 of water per day. System dynamic modelling is done using Matlab/Simulink which contains several models of such systems such as 11.5 kW solar arrays, two stages DC-DC boost converter, 5.5 kW DC shunt motor, and centrifugal pump...
High-speed models of facilities with AC generators and modular multilevel converters have been developed by using the methodology of system modeling by interconnected subsystems. The method of facility separation on parts by introducing in circuits virtual voltage sources has been implemented. Analysis of operation modes of considered systems was completed. Fast response of models was validated.
We evaluate the flying capacitor multilevel converter (FCMC) with one switched-capacitor cell under asymmetric working condition, as a highly efficient hardware realization for the virtual infinite capacitor (VIC). The VIC is a type of electronic circuit, recently introduced to replace large, expensive and unreliable electrolytic capacitors, mainly intended for smoothing random fluctuations of a DC...
This paper proposes a methodology of design and control, and shows the main simulation and experimental results for a LLCC Series-parallel resonant converter applied to Wireless Power Transmission (WPT) in-motion. Using Induced Power Transfer (IPT) and considering a near-field energy-transfer method (less than 20 cm), the converter is applied in a small scale electric vehicle (EV). The modeling was...
In this paper, loss equivalent models of power electronic elements are built to discuss the power loss and efficiency of power electronic systems in real-time simulation. Based on element's dynamic characteristic and loss theory, loss equivalent models which include power switch, inductor and capacitor are established. A real-time simulation circuit of boost converter is tested and compared with the...
Wireless power transfer based on electromagnetic coupling is a popular technique that use in cases where connection between wires are troublesome or inconvenient. Recently, it has been drawing a lot of researcher attention. This is because the usage of portable mobile device is increased and there is a need for wireless charging as their power source. In this paper, an approximate LC lumped element...
Grid connected inverters with LCL output filters are widely used in exporting energy generated from renewable energy sources. The LCL filter and inductors used in this filter has important effect on inverter performance. Although it is different in high power levels nowadays, powder cores are commonly used in inductor design in low and medium power levels. In this study, inductors for LCL filter of...
A novel algorithm for the iterative geometric optimization of EMI filters is presented. The two step approach of an equivalent electric circuit extraction, followed by a sensitivity analysis in the circuit as well as the 3D model domain drives the shape optimization. This allows for a deeper insight into coupling paths and their cause in the model, and their effect in the circuit domain. The concept...
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