Switching frequency characterization of hysteresis control in a pump back test configuration

2017 ◽  
Author(s):  
Xu She ◽  
Tony Frangieh ◽  
Rajib Datta
Keyword(s):  
Switching Frequency ◽  
Test Configuration ◽  
Hysteresis Control

Development of a Hysteresis Amplifier with an H-bridge Drive for Self-Sensing Magnetic Suspension

2000 ◽  
Vol 12 (3) ◽  
pp. 218-223 ◽  
Author(s):  
Takeshi Mizuno ◽  
◽  
Yuji Ishino
Keyword(s):  
Feedback Control ◽  
Magnetic Suspension ◽  
Switching Frequency ◽  
Switching Rate ◽  
Load Impedance ◽  
Current Comparator ◽  
Switching Times ◽  
Switching Signal ◽  
Hysteresis Control ◽  
A Current

A switching amplifier with an H-bridge drive was developed for self-sensing magnetic suspension. In this amplifier, switching times are controlled by a current comparator with a small hysteresis. The amplifier implemented with such hysteresis control has asynchronous characteristics so that the switching rate depends on the load impedance. When the hysteresis amplifier is used for magnetic suspension, the gap between the suspended object and the electromagnet can be estimated from the switching frequency. Since the Hbridge reverses the polarity of the voltage applied to the coil alternatively, the switching frequency is insensitive to the value of current command to the amplifier. The F/V conversion of the switching signal was used for feedback control with the result that self-sensing suspension was achieved.

scholarly journals Characterization of SiC power module for high switching frequency operation

2010 ◽  
Vol 7 (14) ◽  
pp. 1008-1013 ◽  
Author(s):  
Tsuyoshi Funaki ◽  
Hiroyasu Inoue ◽  
Masashi Sasagawa ◽  
Takashi Nakamura
Keyword(s):  
Switching Frequency ◽  
Power Module ◽  
High Switching Frequency

scholarly journals Development of Sliding Mode Controller for A Modified Boost Cuk Converter Configuration

2017 ◽  
Author(s):  
Sanjeevikumar Padmanaban ◽  
Emre Ozsoy ◽  
Viliam Fedák
Keyword(s):  
Control Method ◽  
Sliding Mode ◽  
Pi Controller ◽  
Switching Frequency ◽  
Sliding Mode Controller ◽  
Cuk Converter ◽  
Pi Controllers ◽  
Equivalent Control ◽  
Hysteresis Control ◽  
High Output

This paper introduces a sliding mode control (SMC) based equivalent control method to a novel high output gain Cuk converter. An additional inductor and capacitor improves the efficiency and output gain of the classical Cuk converter. Classical PI controllers are widely used in DC-DC converters. However, it is a very challenging task to design a single PI controller operating in different load and disturbances. SMC based equivalent control method which achieves a robust operation in a wide operation range is also proposed. Switching frequency is kept constant in appropriate interval in different loading and disturbance conditions by implementing a dynamic hysteresis control method. Numerical simulations conducted on Matlab/Simulink confirm the accuracy of analytical analysis of high output gain modified Cuk converter. In addition, proposed equivalent control method is validated in different perturbations to demonstrate the robust operation in wide operation range.

A New Modulation Method Based on Current Hysteresis Control for Cascaded H-Bridge Inverter

2012 ◽  
Vol 588-589 ◽  
pp. 393-396
Author(s):  
Min Sheng Yang ◽  
Si Guo Zhu
Keyword(s):  
Pulse Generator ◽  
Control Method ◽  
Fast Response ◽  
Control Pulse ◽  
Modulation Method ◽  
Switching Frequency ◽  
Switching Losses ◽  
Current Limiting ◽  
Hysteresis Control ◽  
A Current

This paper puts forward a current hysteresis control method suitable for cascaded H-bridge inverter. It has the following characteristics : The control method is similar to unipolar SPWM modulation for a single H bridge.It is simple for pulse generator and can effectively reduce the switching losses; The phase-shifted control pulse for multi H bridges of a phase with current hysteresis control can be generated which is similar to the phase shift SPWM by dynamically adjusting the width of hysteresis to keep power device switching frequency constant; It retains fast response, internal current limiting and with good stability for current hysteresis control.At last, the experimental results verify the correctness of the proposed method.

scholarly journals Fuzzy hysteresis current control of five phase permanent magnet motor under open-circuit faults

2018 ◽  
Vol 7 (2.28) ◽  
pp. 369
Author(s):  
Mekri Fatiha ◽  
Oum El Fadhel Loubaba Bekri
Keyword(s):  
Open Circuit ◽  
Current Control ◽  
Switching Frequency ◽  
Permanent Magnet Motor ◽  
Torque Density ◽  
Hysteresis Current Control ◽  
Current Controller ◽  
Reference Current Generation ◽  
Two Phases ◽  
Hysteresis Control

This paper presents a new current controller of a PWM of multiphase PM machines with a fuzzy logic band. With this kind of system it is possible to determine optimal currents references which maximize the torque density of the system when one or two phases are open circuited. We propose in this paper to combine this optimal reference current generation with fuzzy hysteresis control band. This solution allows a good tracking of these unconventional reference currents with a fixed switching frequency for the VSI. The study carried on simulation via software MatLab/Simulink.  

scholarly journals Characterization of Ottawa Sand and Application to Blast Simulations

2021 ◽  
Vol 250 ◽  
pp. 02009
Author(s):  
Sidney Chocron ◽  
Alexander Carpenter ◽  
Arthur Nicholls ◽  
James Walker ◽  
Ohad Elbaz ◽  
...  
Keyword(s):  
Constitutive Model ◽  
High Speed ◽  
Steel Plate ◽  
Triaxial Compression ◽  
Mechanical Tests ◽  
Test Configuration ◽  
Ottawa Sand ◽  
Laboratory Characterization ◽  
Different Depths

The present work aims at presenting consistent data both from laboratory characterization and from blast tests to see how a computer model performs when only data from mechanical tests are being fed to the constitutive model. A sand (Ottawa 20-30) that meets ASTM C778 requirements, i.e., well characterized microscopically, was tested in triaxial compression under confinement pressures ranging from 50 to 300 MPa and moisture contents of 0 to 15% as well as high strain-rates. These tests provided both the experimental equation of state (pressure vs. volume) and compaction curves as well as the strength vs. pressure properties to build a constitutive model both in LS-DYNA and CTH. Blast tests were subsequently performed by burying explosive at three different depths inside a sand pot with a rigid steel plate on top. During flight, the height of the steel plate was tracked with Phantom high-speed cameras to determine the impulse transmitted to the plate as well as the maximum jump height. Simulations were performed with both an Eulerian code (CTH) and a Lagrangian/ALE code (LS-DYNA) using the constitutive model determined during the material characterization. The predictions of both codes are as close as 7% and as far as 22%, depending on the test configuration.

Double-Hysteresis Current Control Strategy of PWM Rectifier

2013 ◽  
Vol 433-435 ◽  
pp. 1037-1044
Author(s):  
Wen Shao Bu ◽  
Lei Lei Xu ◽  
Xian Bo Wang ◽  
Xin Win Niu
Keyword(s):  
Control Method ◽  
Current Control ◽  
Switching Frequency ◽  
Current Response ◽  
Pwm Rectifier ◽  
Hysteresis Current Control ◽  
Switching Power ◽  
Three Phase ◽  
Hysteresis Controller ◽  
Hysteresis Control

to hold the merits of the traditional hysteresis controller, and at the same time, hold back the change of switching frequency and reduce the switching power loss in hysteresis control of PWM rectifier, based on the relationship between line currents and switching status, an improved algorithm of double-hysteresis current control method for three-phase voltage-type PWM converter was proposed. In the strategy, the position of reference voltage vector can be detected by double hysteresis, PLL circuit can detect the output of switching states. The proposed algorithms not only hold the merits of traditional hysteresis, such as quick current response and current limited capacity, but also, it can overcome the drawback of non-fixed switching frequency of traditional hysteresis. The algorithm has been simulated and verified by MATLAB/simulink platform, and the system operates stably.

scholarly journals A Multilevel Inverter Bridge Control Structure with Energy Storage Using Model Predictive Control for Flat Systems

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Paolo Mercorelli
Keyword(s):  
Energy Storage ◽  
Model Predictive Control ◽  
Predictive Control ◽  
Control Structure ◽  
Control Technique ◽  
Switching Frequency ◽  
Optimal Current ◽  
Electromagnetic Linear Actuator ◽  
New Generation ◽  
Hysteresis Control

The paper presents a novel technique to control the current of an electromagnetic linear actuator fed by a multilevel IGBT voltage inverter with dynamic energy storage. The technique uses a “cascade model predictive control (MPC),” which consists of two MPCs. A predictive control of the trajectory position predicts the optimal current, which is considered to be the desired current for the second MPC controller in which a hysteresis control technique is also integrated. Energy is stored in a capacitor using energy recovery. The current MPC can handle a capacitor voltage higher than the source voltage to guarantee high dynamic current and disturbance compensation. The main contribution of this paper is the design of an optimal control structure that guarantees a capacitor recharge. In this context, the approach is quite new and can represent a general emerging approach allowing to reduce the complexity of the new generation of inverters and, in the meantime, to guarantee precision and acceptable switching frequency. The proposed technique shows very promising results through simulations with real actuator data in an innovative transportation technology.

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