Current-Sensing Resistor Design to Include Current Derivative in PWM H-Bridge Unipolar Switching Power Amplifiers for Magnetic Bearings

Ren, Yuan; Fang, Jiancheng

doi:10.1109/tie.2011.2179277

Cited by 73 publications

(49 citation statements)

References 34 publications

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“…A S IS widely known, power amplifiers (PAs) are the major source of nonlinear distortion and are also the most power consuming devices in numerous industrial electronic applications [1]- [11], e.g., in magnetic bearing [1]- [3], digital video broadcasting [4], radio frequency (RF) transceivers [5]- [8], and dual-band/wideband wireless communications [9], [10]. Specifically, in wireless communications, to enhance the spectral efficiency in modern high-speed wireless communication systems, different nonconstant envelope modulation schemes, such as wideband code division multiple access (WCDMA) [11] in third generation (3G) mobile networks and orthogonal frequency division multiple access in 3rd Generation Partnership Project (3GPP) long-term evolution (LTE), are normally employed.…”

Section: Introductionmentioning

confidence: 99%

A Robust Augmented Complexity-Reduced Generalized Memory Polynomial for Wideband RF Power Amplifiers

Liu

Zhou

Chen

et al. 2014

IEEE Trans. Ind. Electron.

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This paper proposes a robust model for the accurate behavioral modeling and digital predistortion (DPD) of wideband radio-frequency power amplifiers (PAs). It is constructed using a complexity-reduced generalized memory polynomial (MP) (GMP) (CR-GMP) connected with a nonlinear memory effect (NME) subblock in parallel. The CR-GMP is a complexity-reduced but accuracy-degraded version of the conventional GMP, and its performance is augmented by the extra NME subblock. Hence, the proposed model is termed as augmented CR-GMP (ACR-GMP). The resultant ACR-GMP model can achieve comparable performance as the GMP model, but with much fewer coefficients and lower complexity. Its performance is experimentally assessed both in forward modeling and DPD linearization. Comparisons are conducted between the ACR-GMP model and some state-of-the-art models, such as the MP, the PLUME, and the GMP. Experimental results have been given for a 1.9-GHz 35-W peak-power GaN Class-AB PA driven by two signal scenarios: a 15-MHz bandwidth long-term-evolution signal and a 20-MHz bandwidth widebandcode-division-multiple-access 1001 signal (with the middle two carriers OFF). All the results show that the ACR-GMP model outperforms both the MP and the PLUME models in terms of performances and the GMP model in terms of complexity (at comparable performances).Index Terms-Behavioral modeling, digital predistortion (DPD), generalized memory polynomial (MP) (GMP), memory effect, MP, power amplifiers (PAs).

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Section: Introductionmentioning

confidence: 99%

A Robust Augmented Complexity-Reduced Generalized Memory Polynomial for Wideband RF Power Amplifiers

Liu

Zhou

Chen

et al. 2014

IEEE Trans. Ind. Electron.

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“…To demonstrate the effectiveness and superiority of the proposed stability criterion, comparative simulation between the proposed method and the traditional one (root locus with respect to rotor speed) and experiments have been performed. Figure 3 shows the experimental setup, where the MSR has two 2-degree-of-freedom (DOF) radial MBs and two single-DOF axial MBs, which are driven by five H-bridge unipolar switching power amplifiers independently [42], realizing 5-DOF active control.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Complex-Coefficient Frequency Domain Stability Analysis Method for a Class of Cross-Coupled Antisymmetrical Systems and Its Extension in MSR Systems

Ren

Fang

2014

Mathematical Problems in Engineering

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This paper develops a complex-coefficient frequency domain stability analysis method for a class of cross-coupled two-dimensional antisymmetrical systems, which can greatly simplify the stability analysis of the multiple-input multiple-output (MIMO) system. Through variable reconstruction, the multiple-input multiple-output (MIMO) system is converted into a single-input single-output (SISO) system with complex coefficients. The pole locations law of the closed-loop system after the variable reconstruction has been revealed, and the controllability as well as observability of the controlled plants before and after the variable reconstruction has been studied too, and then the classical Nyquist stability criterion is extended to the complex-coefficient frequency domain. Combined with the rigid magnetically suspended rotor (MSR) system with heavy gyroscopic effects, corresponding stability criterion has been further developed. Compared with the existing methods, the developed criterion for the rigid MSR system not only accurately predicts the absolute stability of the different whirling modes, but also directly demonstrates their relative stability, which greatly simplifies the analysis, design, and debugging of the control system.

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“…10, is employed as the controlled plant since its MSR possesses significant gyroscopic effects and first-order bending mode, where the MSR has two 2-DOF radial HMBs and two single-DOF axial HMBs, which are driven by five H-bridge unipolar switching power amplifiers independently [41].…”

Section: A Simulation and Experimental Setupmentioning

confidence: 99%

Whirling Modes Stability Criterion for a Magnetically Suspended Flywheel Rotor With Significant Gyroscopic Effects and Bending Modes

Ren

Fang

2013

IEEE Trans. Power Electron.

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To intuitively analyze the absolute and relative stability of the forward and backward whirling modes of the high-speed magnetically suspended flywheel rotor with significant gyroscopic effects and bending modes, this paper presents a whirling modes stability criterion based on complex coefficient frequency characteristics method. Through variable reconstruction, the multipleinput multiple-output magnetically suspended rotor system is converted into a single-input single-output (SISO) system with complex coefficients. The stability equivalence of the systems before and after variable reconstruction has been proven. Based on this, the inherent relationships between the distribution of the closedloop poles of the complex coefficient SISO system and the whirling modes stability are revealed, and the Nyquist stability criterion is further extended by applying the argument principle. All of these lay the foundation for the whirling modes stability theorem, and then, their stability criterion is further developed. Simulation and experimental results prove the effectiveness and correctness of the presented criterion.Index Terms-Bending mode, characteristic locus method, complex coefficient frequency characteristics, gyroscopic effects, magnetically suspended flywheel (MSFW), stability criterion, whirling mode.

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Current-Sensing Resistor Design to Include Current Derivative in PWM H-Bridge Unipolar Switching Power Amplifiers for Magnetic Bearings

Cited by 73 publications

References 34 publications

A Robust Augmented Complexity-Reduced Generalized Memory Polynomial for Wideband RF Power Amplifiers

A Robust Augmented Complexity-Reduced Generalized Memory Polynomial for Wideband RF Power Amplifiers

Complex-Coefficient Frequency Domain Stability Analysis Method for a Class of Cross-Coupled Antisymmetrical Systems and Its Extension in MSR Systems

Whirling Modes Stability Criterion for a Magnetically Suspended Flywheel Rotor With Significant Gyroscopic Effects and Bending Modes

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