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Conventional Wireless Power Transfer (WPT) has limitation due to the contradiction between the power transfer efficiency (PTE) and power transmission distance. A novel network called Wireless Power Transfer Network (WPTN) is proposed to help overcome the limitation, and power is efficiently transferred from a transfer node to a receive node via relay nodes over a relatively long transmission distance...
For grid-tied inverters, islanding occurs when the grid is disconnected but the inverters are still energizing the local loads. When the inverter output active and reactive power match the local loads, the inverter output voltage and frequency will keep the same values as before. Islanding poses a hazard to maintenance workers and equipment. To detect islanding, a disturbance signal is usually added...
This paper proposes a new modeling method for buck converter. The new modeling method, named bi-switching status method (BSM), for buck converter is obtained via the propositional calculus and linear constrain. Based on the mixed logical dynamical (MLD) model, BSM model of buck converter is obtained. Compared with other modeling methods, such as MLD method and state-space averaging method, streamlined...
Based on the existing voltage balancing scheme for two series HV-IGBTs (High voltage insulated gate bipolar transistors) with active clamping and status feedback, this paper focuses on the characteristics of IGBT with active clamping circuit. First, the previous series IGBT model is improved according to the experiment results in order to give accurate feedback signal in the active clamping sub-circuit...
In order to overcome the disadvantages in traditional “EE” shape coupled inductors that the distributions of the air gaps are too concentrated, the distributions of the magnetic pressure and flux are not uniform, the air gaps are too nearly to the windings, this paper proposes a new structure of coupled inductors. It is proved with simulation and experiment that in the new structure, a parallel connection...
According to the DC bias problem of AC power network, this paper puts forward the new type power transformer based on two-phase magnetic materials, which uses flux of two-phase magnetic materials to counteract flux of DC bias. In order to get variable stable flux of two-phase magnetic materials, intelligent control system is proposed with PWM controlled rectifier and detecting circuit of peak value...
Multiple resonances may result in instability of a LCL filter based multiple grid connected converter (MGCC) system. This paper investigates the critical factors of multiple resonances in MGCC system. It is found that, closed-loop output admittance of the grid connected converter can be configured to meet the requirements of resonances suppression, by properly designing control method and parameters...
Distributed Power System (DPS) is a widely adopted power structure for renewable energy application and tele-communication, computer system, aerospace industry, etc. DPS is more reliable and flexible than the traditional concentrated power system. The communication for the DPS utilities plays an important role in the system framework. The reliability, low cost and easy implementation are important...
Vibrational energy harvesting is gaining more and more attentions recently due to increasing power demands for on-board and remote applications. Piezoelectric Zirconate Titanate (PZT) based cantilever structure is one of the popular forms for vibrational energy harvesting. However, due to its complex electromechanical characteristics, the energy harvesting still remains as a challenge. This paper...
Magnetic flux leakage transformer (MFLT) is widely used in the stable power supply of electronic equipment. For MFLT, whose characteristics become more complex and nonlinear for its leakage and load, the traditional circuit analysis method of transformer could not describe it accurately. In this paper, a nonlinear-transient field-circuit coupled finite element model is used to simulate the MFLT with...
This study presents a novel topology named high voltage-gain boost DC-DC converter with tapped-inductor. The proposed topology provides a high voltage-gain and low input current ripple which are suitable for alternative power sources such as PV and fuel-cell applications. The interleaved control mode can be used to reduce input and output filtering. Moreover, the voltage stress on MOSFETs are clamped,...
In this paper, an accurate small-signal model with peak current mode (PCM) control for the Active clamp forward converter under continuous inductor current condition is proposed. To obtain this model, the “Ridely Approach” is utilized to derive the accurate Modulation gain, feedback gain and feed-forward gain in which the magnetizing inductance is fully taken into account. Clamp capacitor and magnetizing...
The Boost converter with digital current-mode control and leading edge modulation is modeled in z-domain first in this paper. The influences of time delay and zero-order holder (ZOH) on digital controlled converters are taken into consideration. Then, the corresponding circuit model is established and simulations are performed to show the effectiveness of the z-model. It's shown by simulations based...
Bi-directional inductive power transfer (BD-IPT) systems are suitable for applications such as wireless integration of Electric Vehicles (EV) with the utility grid. This paper presents a comprehensive comparison of the performance between the two most widely used BD-IPT systems in EV applications - a parallel tuned inductor-capacitor-inductor type BD-IPT system and a series tuned inductor-capacitor...
The conducted EMI simulation plays an important part in the SMPS in the product design. The analysis of common mode noise is much more complex than differential mode noise. The CE simulation accuracy depends on the accuracy of CM mode noise. CM noises are determined by the electric coupling between the voltage jump point and the ground. Traditional the CM models of the electric coupling between the...
This paper proposes a novel high gain DC-DC converter, the core structure of the circuit is a bridge which is composed of two power switches and two equivalent voltage sources. The two equivalent voltage sources are charged in parallel during the two switches turn on and are discharged in series during the two switches turn off, which makes the converter produce high output voltage to realize high...
Component importance is the key parameter of reliability analysis in power converter. Because of the particularity of topology, the traditional importance evaluation methods are not completely suitable for power converter. Based on complex network theories, the topology of power converter can be transformed to a complex network, and a method to evaluate component importance is proposed by using importance...
A new hysteretic control strategy with output capacitor equivalent series resistance (ESR) ripple compensation is presented. With such compensation, the effect of output capacitor ESR ripple voltage is enhanced. When step load change occurs, feedback of the output ripple adjusts the duty ratio promptly. In result, the proposed control scheme gains faster transient response speed and better steady...
As an example of push-pull SPWM inverter, this paper presents a mathematical model of the push-pull transformer, considers the on-off status of switching devices and discusses the time and space characteristics of the dynamic and effective leakage inductance which means that the leakage inductance within primary/secondary windings of the push-pull transformer has the action time and associated winding...
Based on the equivalent circuit model (ECM) of lithium-ion battery, this paper introduces an autoregressive and moving average with exogenous input (ARMAX) model. A recursive extended least square algorithm with forgetting factor is employed as the model parameter identification method, because there is a colored noise in operating process. Then HPPC test was conducted on a 20Ah LiFePO4 cell and the...
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