scholarly journals Thermal Mapping of Power Semiconductors in H-Bridge Circuit

2020 ◽  
Vol 10 (12) ◽  
pp. 4340 ◽  
Author(s):  
Dao Zhou ◽  
Yingzhou Peng ◽  
Francesco Iannuzzo ◽  
Michael Hartmann ◽  
Frede Blaabjerg
Keyword(s):  
Thermal Stress ◽  
Bridge Circuit ◽  
Circuit Simulation ◽  
Piecewise Linear ◽  
Factor Loading ◽  
Electrical Circuit ◽  
Junction Temperature ◽  
Modulation Method ◽  
Switching Frequency ◽  
Power Semiconductors

In this paper, a universal H-bridge circuit is used as a loading emulator to investigate the loss and thermal models of the power semiconductor. Based on its operation principle and modulation method, the dominating factors’ (e.g., power factor, loading current, fundamental frequency, and switching frequency) impact on the thermal stress of power semiconductors is considerably evaluated. The junction temperature in terms of the mean value and its swing is verified by using Piecewise Linear Electrical Circuit Simulation (PLECS) simulation and experimental setup. It helps to allocate the loading condition in order to obtain the desired thermal stress.

scholarly journals High energy-efficient electrical drive with multilevel inverter and widebandgap power semiconductors

2021 ◽  
Vol 19 ◽  
pp. 91-96
Author(s):  
R. Mecke ◽  
Keyword(s):  
High Energy ◽  
Wide Bandgap ◽  
Drive System ◽  
Junction Temperature ◽  
Switching Frequency ◽  
Loss Reduction ◽  
Voltage Range ◽  
Power Semiconductors ◽  
Power Switches ◽  
Motor Operation

Multilevel inverters are an alternative for electrical drives with DC link voltage between 560 and 750 V. In this voltage range new wide-bandgap power switches (SiC MOSFET, GaN FET) are available. The paper analyses three-, four-, five- and seven-level inverters. A simulation model of the drive system, including the 11 kW induction motor and motor filter is developed. By replacing IGBTs with SiC FETs, the twolevel inverter achieved a loss reduction of 59 % at 25 °C and 150 °C at nominal motor operation point. By using the five-level inverter with GaN FETs, a further loss reduction of 9 % only at low junction temperature is possible. With a higher number of inverter levels, the size of the motor filter can be reduced. With five inverter levels and 40 kHz switching frequency volume and weight can be reduced by 86 % and 78 % respectively. The overall efficiency of the drive system achieves 98.5 % at 25 °C and 98.1 % at 150 °C. Compared to the state of the art (two-level with IGBTs with 5 kHz), this is an improvement of 2.1 % at 25 °C and 2.7 % at 150 °C.

scholarly journals An IDA-PBC Design with Integral Action for Output Voltage Regulation in an Interleaved Boost Converter for DC Microgrid Applications

Actuators ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 5
Author(s):  
Oscar Danilo Montoya ◽  
Federico Martin Serra ◽  
Walter Gil-González ◽  
Eduardo Maximiliano Asensio ◽  
Jonathan Emmanuel Bosso
Keyword(s):  
Output Voltage ◽  
Circuit Simulation ◽  
Piecewise Linear ◽  
Voltage Regulation ◽  
Electrical Circuit ◽  
Voltage Profile ◽  
Nonlinear Feedback ◽  
Dc Microgrid ◽  
Integral Action ◽  
Interleaved Boost Converter

This paper describes the output voltage regulation control for an interleaved connected to a direct current (DC) microgrid considering bidirectional current flows. The proposed controller is based on an interconnection and damping passivity-based control (IDA-PBC) approach with integral action that regulates the output voltage profile at its assigned reference. This approach designs a control law via nonlinear feedback that ensures asymptotic stability in a closed-loop in the sense of Lyapunov. Moreover, the IDA-PBC design adds an integral gain to eliminate the possible tracking errors in steady-state conditions. Numerical simulations in the Piecewise Linear Electrical Circuit Simulation (PLECS) package for MATLAB/Simulink demonstrate that the effectiveness of the proposed controller is assessed and compared with a conventional proportional-integral controller under different scenarios considering strong variations in the current injected/absorbed by the DC microgrid.

scholarly journals Control Configurations for Reactive Power Compensation at the Secondary Side of the Low Voltage Substation by Using Hybrid Transformer

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 620
Author(s):  
Mohammed Radi ◽  
Mohamed Darwish ◽  
Gareth Taylor ◽  
Ioana Pisica
Keyword(s):  
Reactive Power ◽  
Low Voltage ◽  
Circuit Simulation ◽  
Piecewise Linear ◽  
Distribution Networks ◽  
Electrical Circuit ◽  
Distribution Transformer ◽  
Voltage Level ◽  
Transmission Grid ◽  
New Device

The high penetration of new device technologies, such as Electric Vehicles (EV), and Distributed Generation (DG) in Distribution Networks (DNs) has risen new consumption requirements. In this context, it becomes crucial to implement a flexible, functional and fast responsive management of the voltage level and Reactive Power (RP) in the DN. The latest improvements in the Solid State Switches (SSS) field demonstrate they can be used as a Power Electronic (PE) converter. In particular, they have been shown to be capable of operating synchronously with transformers, making the Hybrid Distribution Transformer (HT) concept a potential and cost-effective solution to various DN control issues. In this paper, a HT-based approach consisting of augmenting the conventional Low Voltage (LV) transformer with a fractionally rated PE converter for regulating and controlling the RP in the last mile of the DN is proposed. In this way, it is expected to meet the demand of the future DN from an efficiency, controllability and volume perspective. The proposed approach is implemented using a back-to-back converter. In addition, a power transfer control topology is used to implement the proposed control of the RP injection that controls the voltage level at the Direct Current (DC) link. The proposed approach has been demonstrated in different load scenarios using the Piecewise Linear Electrical Circuit Simulation (PLECS) tool. The simulation results show that the proposed approach can compensate the loads with their need from RP instead of feeding them from the transmission grid at the primary side of the Distribution Transformer (DT). In this way, the proposed approach is able to decrease the transferred amount of RP in the transmission lines.

HYPERCHAOS IN A MODIFIED CANONICAL CHUA'S CIRCUIT

2004 ◽  
Vol 14 (01) ◽  
pp. 221-243 ◽  
Author(s):  
K. THAMILMARAN ◽  
M. LAKSHMANAN ◽  
A. VENKATESAN
Keyword(s):  
Numerical Analysis ◽  
Differential Equations ◽  
Ordinary Differential Equations ◽  
Laboratory Experiments ◽  
System Parameter ◽  
Piecewise Linear ◽  
Electrical Circuit ◽  
First Order ◽  
Regular Behavior ◽  
Linear Elements

In this paper, we present the hyperchaos dynamics of a modified canonical Chua's electrical circuit. This circuit, which is capable of realizing the behavior of every member of the Chua's family, consists of just five linear elements (resistors, inductors and capacitors), a negative conductor and a piecewise linear resistor. The route followed is a transition from regular behavior to chaos and then to hyperchaos through border-collision bifurcation, as the system parameter is varied. The hyperchaos dynamics, characterized by two positive Lyapunov exponents, is described by a set of four coupled first-order ordinary differential equations. This has been investigated extensively using laboratory experiments, Pspice simulation and numerical analysis.

scholarly journals Three-Saddle-Foci Chaotic Behavior of a Modified Jerk Circuit with Chua’s Diode

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1803
Author(s):  
Pattrawut Chansangiam
Keyword(s):  
Equilibrium Point ◽  
Chaotic Behavior ◽  
Initial Conditions ◽  
Piecewise Linear ◽  
Equilibrium Points ◽  
Initial Point ◽  
Electrical Circuit ◽  
Nonlinear Resistor ◽  
Voltage Current Characteristic ◽  
Time Waveform

This paper investigates the chaotic behavior of a modified jerk circuit with Chua’s diode. The Chua’s diode considered here is a nonlinear resistor having a symmetric piecewise linear voltage-current characteristic. To describe the system, we apply fundamental laws in electrical circuit theory to formulate a mathematical model in terms of a third-order (jerk) nonlinear differential equation, or equivalently, a system of three first-order differential equations. The analysis shows that this system has three collinear equilibrium points. The time waveform and the trajectories about each equilibrium point depend on its associated eigenvalues. We prove that all three equilibrium points are of type saddle focus, meaning that the trajectory of (x(t),y(t)) diverges in a spiral form but z(t) converges to the equilibrium point for any initial point (x(0),y(0),z(0)). Numerical simulation illustrates that the oscillations are dense, have no period, are highly sensitive to initial conditions, and have a chaotic hidden attractor.

Biomaterial Impedance Analyzer Based on Digital Auto Balancing Bridge

2011 ◽  
Vol 291-294 ◽  
pp. 1259-1262
Author(s):  
Nan Li ◽  
Yi Nan Wang ◽  
Hong Shan Nie ◽  
Hong Qi Yu ◽  
Hui Xu
Keyword(s):  
Bridge Circuit ◽  
Design Method ◽  
Circuit Simulation ◽  
Low Frequency ◽  
Operational Amplifiers ◽  
Frequency Synthesis ◽  
Direct Digital Frequency Synthesis ◽  
Impedance Analyzer ◽  
Digital Frequency ◽  
Phase Sensitive

This paper presents the design method of a novel biomaterial impedance analyzer based on digital auto balancing bridge method. The system hardware mainly consists of FPGA, ADC, DACs and operational amplifiers. Many DSP algorithms such as direct digital frequency synthesis (DDS), digital phase sensitive demodulation (DPSD), digital modulation and digital filter are implemented in FPGA to realize the auto balancing function of the bridge circuit. Simulation results show that the system has good performance from low frequency to 10MHz. It is suitable for EIS application in biomaterial analysis.

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