Browsing by Author "Chen, Keng-Yuan"

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A Filtered SVPWM for Multiphase Voltage Source Inverters Considering Finite Pulse-Width Resolution
(2012-07-01)
Chen, Keng-Yuan
;
Hu, Jwu-Sheng
;
電機工程學系
;
Department of Electrical and Computer Engineering
A filtered space-vector pulse-width modulation (SVPWM) considering finite pulse-width resolution is proposed to produce a switching sequence with reduced baseband harmonics for multiphase voltage source inverters (VSI). The conventional SVPWM is sensitive to the pulse-width resolution which leads to increased harmonic distortion in digital-based implementations. By incorporating a pseudofeedback loop regarding weighted voltage difference between desired and produced phase voltages, the quantization error induced by finite pulse-width resolution is compensated, yielding a better tracking performance. The gating signals for multiphase VSIs are presented through rigorous mathematical derivation. In simulations and experiments, harmonic distortions of SVPWMs with and without filter compensation under various pulse-width resolutions are shown. The results confirm the effectiveness of the proposed scheme. The main advantage realized is reduction of acoustic noise and increased tracking accuracy.
A General Actuator Array Amplifier Design Using MIMO Optimal Feedback Quantization
(2008)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper proposes a novel switch-mode power stage architecture for actuator array. When the number of actuator is large, the associated power amplifier becomes costly and bulky if each actuator is controlled by an independent amplifier. The proposed architecture allows sharing of the power amplifier among actuators, and thereby reducing the number of switching devices. The architecture is mapped into the graph theorem and the acceptable actuation states are analyzed. The switching method is controlled by an MIMO optimal feedback quantization, which is designed to minimize a weighted measure of the quantization distortion. Simulation results are provided to illustrate the effectiveness of the proposed scheme.
A General Switch-Mode Amplifier Design for Actuators Using MIMO Optimal Feedback Quantization
(2009-12-01)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper proposes a novel switch-mode power stage architecture for actuators. For a large number of actuators, the associated power amplifier becomes costly and bulky when each actuator is controlled by an independent amplifier. The proposed architecture allows actuators to share power amplifiers, thereby reducing the number of switching devices. This architecture is mapped into the graph theorem, and acceptable actuation states are analyzed. The switching method is controlled by multiple-input multiple-output optimal feedback quantization, which is designed to minimize a weighted measure of quantization distortion. Simulation and experimental results illustrate the effectiveness of the proposed scheme.
A novel switch mode amplifier design for actuator array using MIMO optimal feedback quantization
(2007)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper proposes a novel switch-mode power stage architecture for actuator array. When the number of actuator is large, the associated power amplifier becomes costly and bulky if each actuator is controlled by an independent amplifier. Further, the increased operational block raises power consumption and is inefficient. The proposed architecture allows sharing of the power ampler among actuators, and thereby reducing the number of switching devices. The switching method is controlled by an MIMO optimal feedback quantization, which is designed to minimize a weighted measure of the quantization distortion. The proposed method is applied to design a class-D stereo audio amplifier (dual actuators). The control performance and cross-talk behavior are investigated.
A novel switching strategy for FOC motor drive using multi-dimensional feedback quantization
(2012-02-01)
Chen, Keng-Yuan
;
Hu, Jwu-Sheng
;
Tang, Chi-Him
;
Shen, Te-Yang
;
電機工程學系
This work proposes a new switching strategy for field oriented control of motor driver to minimize the power of filtered error. By modifying pulse-width resolution and system operating frequency, the switching number is reduced without sacrificing the speed performance. Noise shaping induced by different sampling rates is analyzed. Conventional space vector pulse width modulation is shown to be a special case of the proposed strategy. Another case with zero-bit pulse-width resolution, MDFQM, is proposed. Experimental results show that MDFQM can reduce switching number and heat dissipation of transistors. This property enhances the control efficiency, reliability and durability of power stage. (C) 2011 Elsevier Ltd. All rights reserved.
An FPGA implementation of finite horizon constrained optimization for a full digital amplifier
(2007)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper reports a novel application of finite horizon constrained optimization techniques to design an audio-band full digital amplifier. The digital amplifier using power MOSFET requires a modulator to modulate the reference signal into binary sequences. The modulator can be viewed as an over-sampled quantizer with noise-shaping requirement. An FPGA (Field Programmable Gate Array) implementation of the finite horizon constrained optimization technique to construct the modulator is presented. Experimental results are shown by driving the loudspeaker load.
An introduction to the control of switching electronic systems
(2010-12-01)
Goodwin, Graham C.
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Mayne, David Q.
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Chen, Keng-Yuan
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Coates, Colin
;
Mirzaeva, Galina
Control technology underpins the operation of many, and arguably all, modern high technology systems. Such systems include transportation (aircraft, high speed trains, marine vessels, automobiles), telecommunication systems, electricity networks, mining, minerals processing and agriculture. A particular area where control is playing an increasingly important role is industrial electronics. In this paper we will give a tutorial introduction to the application of control engineering concepts to such systems and reflect on the opportunities and challenges that exist in this area. (C) 2010 Elsevier Ltd. All rights reserved.
Analysis and Control of the 3-and 5-phase Voltage Source Inverters using the Averaged Output Voltage Method
(2009)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A systematic analysis for the multi-phase voltage source inverter (VSI) is illustrated in this paper. By applying the singular value decomposition, the instantaneous output voltage of VSI can be categorized into two complementary groups with the same magnitude and different sign to each other. The switching strategy for minimum conduction time which yields the maximum linear modulation index is proposed. The comparison of SVPWM and the proposed method for 3-phase VSI are shown to be equivalent but the implementation of thus algorithm that needs only comparators and adders is simpler.
Analysis and design of the receding horizon constrained optimization for class-D amplifier driving signals
(2010-12-01)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper reports the analysis and design method of receding finite horizon constrained optimization approaches to generate driving signals for digital amplifiers. The performance of a digital amplifier that is based on power MOSFETs highly depends on the modulator that modulates the reference signal into binary sequences. The concept of receding finite horizon constrained optimization modulator is to generate the binary output in the sense that the power of filtered error is minimized. The stability analysis of this nonlinear feedback system is derived in detail and the method to estimate the bound of filtered error of the high dimensional quantization is proposed. A second order system with horizon length one and two is designed to produce a 1.5-bit constrained output. Simulation results demonstrate the accuracy of the analysis. (C) 2010 Elsevier Inc. All rights reserved.
Analysis and design of the receding horizon constrained optimization for class-D amplifier driving signals
(2010-12-01)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper reports the analysis and design method of receding finite horizon constrained optimization approaches to generate driving signals for digital amplifiers. The performance of a digital amplifier that is based on power MOSFETs highly depends on the modulator that modulates the reference signal into binary sequences. The concept of receding finite horizon constrained optimization modulator is to generate the binary output in the sense that the power of filtered error is minimized. The stability analysis of this nonlinear feedback system is derived in detail and the method to estimate the bound of filtered error of the high dimensional quantization is proposed. A second order system with horizon length one and two is designed to produce a 1.5-bit constrained output. Simulation results demonstrate the accuracy of the analysis. (C) 2010 Elsevier Inc. All rights reserved.
Analytical Solutions of Multilevel Space-Vector PWM for Multiphase Voltage Source Inverters
(2011-05-01)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
Shen, Te-Yang
;
Tang, Chi-Him
;
電機工程學系
This study systematically analyzes multilevel space-vector pulse width modulation for a multiphase voltage source inverter (VSI). The instantaneous output voltages of the VSI, which are called space vectors, can be classified according to the switching states of the VSI. By applying the eigenspace decomposition of the system matrix, the n-phase VSI control problem can be solved analytically. This analysis leads to a switching strategy that uses the fewest space vectors and minimum total conduction time. This yields a minimum switching number and efficient dc supply utilization. Further, the switching strategy of a multilevel multiphase VSI system can be solved based on the switching strategy of a two-level multiphase VSI. Simulations and experimental results confirm the effectiveness of the proposed algorithm.
Class-D driving method for stereo load
(2008-05-15)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
The present invention provides a class D amplifier and method for driving a tri-wired stereo amplifier. Additionally, the class D amplifier includes a first filter, a second filter, a processor, a 2D-quantitizer, a signal generator, and a logic circuit. The class D amplifier and method of the invention can reduce cost of production and increase processing efficiency. More particularly, the class D amplifier and method of the invention are processed in an optimal feedback mode, so as to reduce the reciprocal effect between the two channels, and avoid mismatch of the two amplifiers.
Control of Voltage Source Inverter Using Multidimensional Feedback Quantization Modulator
(2011-07-01)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
Shen, Te-Yang
;
Tang, Chi-Him
;
電控工程研究所
This paper describes a novel switching signal generator for three-phase voltage source inverters. Unlike conventional space-vector pulsewidth modulation (SVPWM) which achieves three-phase input voltage by a combination of the basic space vectors, the proposed scheme produces optimal switching commands to minimize the filtered measure of quantization error. Under specific selections of the filter matrix and the quantization scheme, it is shown that the proposed modulator is equivalent to SVPWM. An experimental platform is built to verify the effectiveness of the proposed scheme. It is shown that the switching number of the proposed method is reduced without sacrificing the harmonic distortion within the input frequency band under various reference signals.
Gating signal generator for multiphase voltage source inverters using space vector PWM
(2011)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
電機學院
;
電機工程學系
;
College of Electrical and Computer Engineering
This work systematically analyzes space vector pulse-width modulation (PWM) for a multiphase voltage source inverter (VSI). The instantaneous output voltages of the VSI, which are called space vectors, can be classified according to the switching states of the VSI. By applying the eigen-space decomposition of the system matrix, the n-phase VSI control problem can be solved analytically. This analysis leads to a switching strategy that uses the fewest space vectors and minimum total conduction time. This yields a maximum linear modulation index and minimum switching number. The analysis reveals that the implementation of the modulator needs only adders and comparators and the computation complexity is independent of the phase number. Simulation results confirm the effectiveness of the proposed algorithm.
High-Efficiency Current Control Methods Based on Multidimensional Feedback Quantization and Its Application to Three-Phase PMSM
(2014-11-01)
Chen, Hung-Chi
;
Chen, Keng-Yuan
;
Chen, Wei-Yu
;
電機資訊學士班
;
Undergraduate Honors Program of Electrical Engineering and Computer Science
In a six-switch three-phase inverter, the conventional pulsewidth modulation (PWM) has six switching times in every switching period based on the average concept. The used multidimensional feedback quantized modulation (MDFQM) strategy selects one switching state and keeps it in every sampling period based on the minimization of filtered voltage errors between the desired voltage commands and the output voltages. The widths of the output voltage pulse are integer times the fixed sampling time in MDFQM. In this paper, two high-efficiency current control methods based on MDFQM are proposed. They integrate the MDFQM strategy and the current control function to minimize the filtered current errors between the desired current commands and the inverter current. Due to the main advantages of less switching numbers and more closed fundamental current, a high-efficiency performance is achieved. The proposed methods are applied to the current control of a three-phase permanent-magnet synchronous motor. The simulation results and experimental results verify the effectiveness of the proposed methods.
Multi-Dimensional Feedback Quantized Modulation used in Three-Phase PMSM Motor Current Control
(2013)
Chen, Hung-Chi
;
Chen, Keng-Yuan
;
Chen, Wei-Yu
;
Hu, Jwu-Sheng
;
電控工程研究所
A current controlled switching strategy using multi-dimensional feedback quantized modulation is proposed in this work. The proposed strategy finds an optimal state that minimizes the power of current error, in contrast to conventional space vector pulse width modulation (SVPWM), which switches states in an equivalent mean phase voltage manner. The main advantage is that the output power factor is increased, i.e., an improved power efficiency. The proposed scheme is applied to the control of 3-phase permanent-magnet synchronous motor (PMSM). The simulations confirm the proposed control strategy.
System analysis of an optimal noise shaped quantizer for audio-band digital amplifier
(2007)
Hu, Jwu-Sheng
;
Chen, Keng-Yuan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper reports a novel application of receding finite horizon constrained optimization techniques to design an audio-band full digital amplifier. The digital amplifier using power MOSFET requires a modulator to modulate the reference signal into binary sequences. The modulator can be viewed as an over-sampled quantizer with noise-shaping, requirement. One of the main issues in designing the modulator is to maintain stability while maximizing the ran-e of the reference input signal. The quantization scheme resulting front the optimization is derived in detail to arrive at the stability condition under zero initial conditions. It shows the stability condition becomes more stringent when the relative degree of the shaping filter is high. Simulations results are given to illustrate the effectiveness of the design methodology.
Voltage Source Inverter Drive Using Error-compensated Pulse Width Modulation
(2016-01)
Chen, Keng-Yuan
;
Hu, Jwu-Sheng
;
Lin, Jau-Nan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
An error-compensated pulse width modulator (ECPWM) is proposed to improve the baseband harmonic performance and the switching loss of voltage source inverters (VSIs). Selecting between harmonic distortion and switching loss is a design tradeoff in the conventional space vector pulse width modulation. In this work, an accumulated difference in produced and desired phase voltages is considered to adjust the reference signal. This mechanism can compensate for the voltage error in the previous carrier period. With error compensation every half-carrier period, the proposed ECPWM allows one-half reduction in carrier frequency without scarifying baseband harmonic distortion. The proposed modulator is applied to a three-phase VSI with R-L load and a motor-speed-control system for experiments. The measured efficiency and operating temperature of switches confirm the effectiveness of the proposed scheme.
Voltage Source Inverter Drive Using Error-compensated Pulse Width Modulation
(2016-01-01)
Chen, Keng-Yuan
;
Hu, Jwu-Sheng
;
Lin, Jau-Nan
;
電控工程研究所
;
Institute of Electrical and Control Engineering
An error-compensated pulse width modulator (ECPWM) is proposed to improve the baseband harmonic performance and the switching loss of voltage source inverters (VSIs). Selecting between harmonic distortion and switching loss is a design tradeoff in the conventional space vector pulse width modulation. In this work, an accumulated difference in produced and desired phase voltages is considered to adjust the reference signal. This mechanism can compensate for the voltage error in the previous carrier period. With error compensation every half-carrier period, the proposed ECPWM allows one-half reduction in carrier frequency without scarifying baseband harmonic distortion. The proposed modulator is applied to a three-phase VSI with R-L load and a motor-speed-control system for experiments. The measured efficiency and operating temperature of switches confirm the effectiveness of the proposed scheme.