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Photo-voltaic generators are no longer an energy source mainly useful for off-grid applications, such as satellites. Their presence in the energy mix of developed countries has substantially increased. Moreover, their price downward trend, together with the upward trend of electric energy prices, might increase their role, if allowed by the legal context. The behavior of photo-voltaic generators is...
The dual circuit of Cockcroft-Walton (CW) circuit is proposed as the multistage Class DE current driven low di/dt rectifier. The dual circuit of CW circuit naturally satisfies Class E switching condition. The equations of diodes and inductors waveforms are obtained at any diode on-duty ratio using the same scheme for Class DE rectifier. Moreover, the simulation and the experimental results are presented...
This paper presents High-gain power conditioning system for grid connected PV applications. The construction of the proposed system consists of high-gain Switched Inductor Quadratic Boost Inverter (SIQBI) and five-switch h-bridge inverter. The proposed system is controlled to satisfy the following criteria: extract maximum power from PV module, boost dc voltage to higher level and inject sinusoidal...
In this paper, a novel approach for control of the DC-DC buck converter in high-power and low-voltage applications is proposed. Designed method is developed according to passivity based controller which is able to stabilize output voltage in a wide range of operation. It is clear that in high-power applications, parasitic elements of the converter may become comparable with load value and hence, in...
In this paper, the way to compensate for flux error caused by estimated stator resistance error will be suggested when PLPF is utilized as flux estimator, which is used for sensorless vector control of induction motor. For the highly efficient sensorless control, flux estimation method using PLPF has been widely used. To accurately obtain flux using PLPF, it is significant to estimate synchronous...
The purpose of this paper is to present a influences of parameter deviations on operation of a novel current sensorless AC-DC converter are discussed. The off time is calculated based on the equations of each operating state for boundary current control mode. The relationship among the THD, power factor and efficiency, and circuit parameter errors are discussed. When the circuit parameter varies from...
Modular multilevel converters have several attractive features such as high voltage capability and scalability, the excellent quality of the output voltage waveforms, a modular structure and the utilisation of standard components. Despite of all these benefits, the main drawback of this converter is the control system complexity due to the multiple external and internal control objectives. One of...
Wide-range load variations in resonant power conversion systems can lead to loss of unity power factor at the output of a switching inverter stage, increasing the circulating reactive energy through the switches and power loss. The load-variation problem can be significantly reduced with use of dedicated circuitry that would “compress” the variation of the load resistance to a smaller range. Current...
We study the calculation of electrical resistance of AT-cut quartz crystal resonators with the consideration of structural viscosity. A theoretical analysis of electrically forced vibrations of the coupled fundamental thickness-shear and spurious modes of a rectangular resonator model which is a partially electroded quartz crystal plate with free edges is performed. The equations are derived for calculating...
The “constant-flux” concept introduced recently is leveraged to distribute magnetic flux to improve energy density, lowering the profile of an inductor. The optimal flux distribution with normalized parameters is identified mathematically, and verified by simulation. It is then applied to reduce the dc resistance of a commercial inductor by a factor of two, keeping the outer dimensions and inductance...
Traditional rectifiers such as the half-wave and full-wave rectifiers have been the only configuration used in resonant inductive links. Despite their popularity, their input current contains a large amount of harmonics which makes them incompatible with resonant inductive links especially those driven by a Class D or Class E resonant inverter. This paper presents a half-wave Class D voltage-switching...
The voltage variation caused by increasing renewable energy generation can be attenuated effectively by using Battery energy storage system (BESS). Firstly, the widely used PNGV method is adopted to build the battery cells model in this paper. Then, the identification methods of electrochemistry battery's electrical equivalent circuit are introduced according to ‘continuous function analytic expression’...
Three-phase induction motor electric parameter estimation has been widely used to improve induction motor control performance. A precise match between electrical parameter values and estimated ones is imperative. A value deviation can make induction motor misbehave, which can cause motor overheating even instability. Parameter estimation can be achieved on-line or off-line way with a large number...
This paper defines the basic critical parameters that are needed to ensure interoperability between line powering products. With well-defined and matched parameters between up and down converters, the line powering system has a better chance of managing fault conditions without interruption to the load. This paper examines two case studies in which certain parameters are mismatched in order to demonstrate...
This paper presents the design of Memristor-capacitor based startup circuit. Memristor is a novel device and has many advantages over conventional CMOS devices such as no leakage current and is easy to manufacture. In this work the switching characteristics of memristor is utilized. First the theoretical equations describing the switching behavior of memristor are derived. To prove the switching capabilities...
We present an innovative and comprehensive approach to model the resistance of local interconnect used in finFET technologies. Our parasitic resistance formulas for finFET source/drain regions cover both merged and unmerged fin processes. They have been verified with field solver simulation results, and are found to be accurate over a wide range of parameter values. Our local interconnect resistance...
A Secret Handshake protocol provides a method of mutual authentication and key agreement which preserves users' anonymity, and prevents any information leakage to an unauthorized participant as well. Although in recent studies some schemes with desirable properties of “Unlinkability” and “Revocability” were proposed, in most of them unlinkability of revoked credentials or co-called “Backward Unlinkability”...
Second and fourth order reconfigurable filter structure implemented with second generation current controlled current conveyor is presented in this paper. Reconfigurable filter structure is widely used on the basis of the encrypted communication, cognitive radio and software defined radio systems. The designed filter is applied to the global positioning systems (GPS, GLONASS, Beidou, GNSS and Galileo)...
Based on city driving cycles, this study analyzes the load distribution of the wheels-side electric drive (WSED) system for vehicles. The input load and speed are defined based on the output torque of motor, and its load characteristics are analyzed by employing gear counting method. The load distribution is determined by stratified sampling method, which follows a mixed Gaussian distribution. Moreover,...
The demand for small-size multi-standard receivers leads to the design of modern receiver architectures with wide tuning range. The performance of these receivers is related to the image rejection ratio, which makes the improvement of the quadrature accuracy mandatory. Hence, minimizing the quadrature error of the receiver's quadrature oscillator is an important goal. In this work, we analyse the...
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