Design of circuits of multilevel inverter on IGBT transistors with pulse-amplitude control

Accounting for friction is important when designing controllers for precision motion control systems. However, the presence of the friction and the flexibility in the system yields undesirable behaviors such as residual vibration and stick-slip oscillation near the reference value. In the proposed development, a pulse amplitude modulated controller with user-specified pulse width, is used to initiate the motion so as to permit the system to coast to the desired final position after the final pulse, with zero residual vibrations. The proposed technique is illustrated on the floating oscillator benchmark problem, where friction acts on the first mass. Numerical simulation illustrates the effectiveness of the proposed technique.

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Controller Design for Flexible Systems with Friction: Pulse Amplitude Control

AIAA Guidance, Navigation, and Control Conference and Exhibit ◽

10.2514/6.2004-5118 ◽

2004 ◽

Cited By ~ 1

Author(s):

Jae-Jun Kim ◽

Tarunraj Singh

Keyword(s):

Controller Design ◽

Pulse Amplitude ◽

Flexible Systems ◽

Amplitude Control

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Hybrid Modulation for Modular Voltage Source Inverters with Coupled Reactors

Energies ◽

10.3390/en13174450 ◽

2020 ◽

Vol 13 (17) ◽

pp. 4450

Author(s):

Krzysztof Jakub Szwarc ◽

Pawel Szczepankowski ◽

Janusz Nieznański ◽

Cezary Swinarski ◽

Alexander Usoltsev ◽

...

Keyword(s):

Pulse Width Modulation ◽

Pulse Amplitude ◽

Barycentric Coordinates ◽

Voltage Source ◽

Switching Frequency ◽

Amplitude Control ◽

Voltage Source Inverters ◽

Hybrid Modulation ◽

Harmonic Elimination ◽

Coupled Reactors

This paper proposes and discusses a concept of a hybrid modulation for the control of modular voltage source inverters with coupled reactors. The use of coupled reactors as the integrating elements leads to significant reduction in the size and weight of the circuit. The proposed modulation combines novel coarsely quantized pulse amplitude modulation (CQ-PAM) and innovative space-vector pulse width modulation (SVPWM). The former enjoys very low transistor switching frequency and low harmonic elimination, while the latter ensures high resolution of amplitude control. The SVPWM is based on the use of barycentric coordinates. The feasibility of the proposed solution is verified by simulations and laboratory tests of a 12-pulse modular voltage source inverters with two-level and three-level component inverters.

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Quantitative evaluation of slow fluctuations of the volume of liquids inside cranial cavity

Russian Osteopathic Journal ◽

10.32885/2220-0975-2019-1-2-51-63 ◽

2019 ◽

pp. 51-63 ◽

Cited By ~ 1

Author(s):

Yu. E. Moskalenko ◽

T. I. Kravchenko ◽

Yu. V. Novozhilova

Keyword(s):

Brain Activity ◽

Sampling Rate ◽

Age Groups ◽

Pulse Amplitude ◽

Cranial Cavity ◽

Current Frequency ◽

Physiological Indicators ◽

Physiological Phenomenon ◽

Long Time ◽

Manned Space

Introduction. Slow fl uctuations in the volume and pressure of liquids in the cranial cavity have been known for a long time and have been studied for more than 100 years. However, their quantitative indicators and their practical signifi cance remain unclear until now due to the diffi culties of research. Nevertheless, it was found that they were connected with the brain activity, which made it possible to use them as one of the physiological indicators in studying the problems of manned space fl ights. Goal of research — to study the possibility of using spectral analysis of slow fl uctuations of the volume of liquids inside the cranium in order to realize the quantitative assessment of their indicators with the use of modern microelectronics and computer technology.Materials and methods. In order to solve this problem we created a complex, in which rheoencephalograph-RG-01 («Mizar») was used as a converter-modulator of physiological signals into electrical oscillations. The device was connected with the ADC (Firm «ADIstrument»), Its software allows to calculate the spectrogram with a sampling rate of 128 kHz. Studies were conducted on volunteers of younger, middle and older age groups. The respiratory rate and the electrocardiography were registered together with the rheoencephalography. Electrodes were fi xed on the volonteers′ fronto-mastoid area.Results. Slow fl uctuations the cranium representan independent physiological phenomenon. The most considerable and valuable were fl uctuations in 0,1–0,3 Hz. It was found that current frequency of 100 or 200 kHz and frequency for quantization of 80–100 kHz was optimal for performing their spectrograms. The structure of such diagram consists of 4–7 peaks with amplitude of 0,4–0,7 units compared with REG pulse amplitude. They depend on age and are characterized by hemispheric asymmetry. Spectral diagrams of slow fl ucation inside cranium are representing inpendent physiological phenomenon. These fl uctuations are not connected by common origin, with heart activity and respiration. They are connected by nature with brain activity and PRM.Conclusion. Can be an informative method for diagnostic and assessment of general status of osteopathic patients well as for the assessment of mechanisms of action of some osteopathic techniques.

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