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Architecture and IC implementation of a digital VRM controller

IEEE TRANSACTIONS ON POWER ELECTRONICS 2003年第1期18卷 356-364页

作者： Peterchev, AV Xiao, JW Sanders, SR Univ Calif Berkeley Dept Elect Engn & Comp Sci Berkeley CA 94720 USA

This paper develops the architecture of a digital PWM controller for application in multiphase voltage regulation modules (VRMs). In this context, passive current sharing and VRM transient response with nonzero controller delay are analyzed. A scheme for sensing a combination of the VRM output voltage and output current with a single low-resolution window analog-to-digital converter (ADC) is proposed. The architecture and IC implementation of a digital PWM (DPWM) generation module, using a ring-oscillator-multiplexer scheme, is discussed. Experimental results from a prototype VRM and a partial controller. IC implementation are presented.

关键词： analog-digital conversion current sharing digital control digital modulation inductance integrated circuits power conversion pulse-width modulation ring oscillators transient analysis voltage control

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Quantization resolution and limit cycling in digitally controlled PWM converters

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2003年第1期18卷 301-308页

作者： Peterchev, AV Sanders, SR Univ Calif Berkeley Dept Elect Engn & Comp Sci Berkeley CA 94720 USA

This paper discusses the presence of steady-state limit cycles in digitally controlled pulse-width modulation (PWM) converters, and suggests. conditions on the control law and the quantization resolution for their elimination. It then introduces single-phase and multi-phase controlled digital dither as a means of increasing the effective resolution of digital PWM (DPWM) modules, allowing for the use of low resolution DPWM units in high regulation accuracy applications. Bounds on the number of bits of dither that can be used in a particular converter are derived. Finally, experimental results confirming the theoretical analysis are presented.

关键词： analog-digital conversion digital control dither finite wordlength effects power conversion pulse-width modulation quantization stability voltage regulation

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Direct repetitive control of SPWM inverter for UPS purpose

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2003年第3期18卷 784-792页

作者： Zhang, K Kang, Y Xiong, J Chen, J Huazhong Univ Sci & Technol Dept Elect Engn Wuhan 430074 Peoples R China

A novel repetitive controller directly combined with an open loop SPWM inverter is presented in this paper. To cope with the high-resonant peak of the open loop inverter that may cause instability, a zero-phase-shift notch filter other than the inverse transfer function of the inverter or a conventional second-order filter is incorporated in the controller. The proposed method has good harmonic rejection and large tolerance to parameter variations. To further reduce the steady-state error, low-pass-filter Q(z) algorithm is applied. DC bias problem is also taken into consideration and solved with the repetitive controller itself. The method is implemented with a digital signal processor and achieves low THD % (1.4%-1.7%) with nonlinear loads and fast error, convergence (3-5 fundamental periods). It proves to be a cost-effective solution for common UPS products where high-quality output voltage is more stressed than fast dynamic response.

关键词： inverters pulse-width modulation repetitive control UPS

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Network-oriented simulation of variable reluctance motor drive systems with PWM control

Network-oriented simulation of variable reluctance motor dri...

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29th Annual Conference of the IEEE Industrial-Electronics-Society

作者： Chayopitak, N Taylor, DG Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA

ISBN: (纸本)0780379063

Mixed-technology systems defined as networks of interconnected components may be simulated by imposing conservation of flow at each node. Given a library of physical component models in a standard form and the means to embed software algorithms for control, this approach to simulation requires little more from the user than to specify what types of physical components are present and how these physical components are interconnected to each other and to the control algorithms. This paper summarizes the technical foundations for this user-friendly simulation philosophy and reports in some detail its application to variable reluctance motor drive systems. Novel features include the development of both switched and averaged models of the pulse-width modulated inverter, and the design and demonstration of high-performance position control algorithms.

关键词： simulation networks nodal analysis motor drives pulse-width modulation position control

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Multimodular systems based on multilevel flying capacitor converters 5

Multimodular systems based on multilevel flying capacitor co...

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5th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2003)

作者： Feng, CM Agelidis, VG Jun, LA Univ Glasgow Dept Elect & Elect Engn Glasgow G12 8QQ Lanark Scotland

ISBN: (纸本)0780378857

Multimodular systems based on the multilevel Flying Capacitor (FC) converter topology are discussed in this paper. Three control techniques are studied and their performance is compared against specific criteria. Different types of Multicarrier Sinusoidal PWM (MSPWM) techniques used for each module along with the Phase-Shifting (PS) concept among the different modules are considered. Techniques with high frequency modulation ratio and the Fundamental Frequency PWM (FFPWM) are studied. The Total Harmonic Distortion (THD) of the output quantities, the system's bandwidth, and the potential switching losses are discussed. Simulation results are given to support the findings.

关键词： multilevel converter pulse-width modulation multimodular system flying capacitor converter

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Quantization resolution and limit cycling in digitally controlled PWM converters

Quantization resolution and limit cycling in digitally contr...

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32nd Annual Power Electronics Specialist Conference (PESC 2001)

作者： Peterchev, AV Sanders, SR Univ Calif Berkeley Dept Elect Engn & Comp Sci Berkeley CA 94720 USA

ISBN: (纸本)0780370678

关键词： analog-digital conversion digital control dither finite wordlength effects power conversion pulse-width modulation quantization stability voltage regulation

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Voltage sag correction by dynamic voltage restorer based on fuzzy logic control

Voltage sag correction by dynamic voltage restorer based on ...

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15th IEEE Canadian Conference on Electrical and Computer Engineering

作者： Jurado, F Valverde, M Carpio, J Univ Jaen Jaen Spain

ISBN: (纸本)0780377818

In basic applications, the fuzzy logic controller is used as a substitute for the conventional PI compensator. The voltage error and its derivative are the Fuzzy Logic controller input crisp values. When a Fuzzy Logic controller is used, the tracking error and transient overshoots of PWM can be considerably reduced. The simulations carried out show that the Dynamic voltage restorer provides excellent voltage regulation capabilities. This paper demonstrates that the transient response of the fuzzy logic control is better than that of PI.

关键词： power quality pulse-width modulation voltage sag

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Microcontroller-based multi-sensor apparatus for temperature control and thermal conductivity measurement

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MEASUREMENT SCIENCE AND TECHNOLOGY 2003年第8期14卷 N45-N49页

作者： Mukaro, R Gasseller, M Kufazvinei, C Olumekor, L Taele, BM Bindura Univ Sci Dept Phys Bindura Zimbabwe Univ Zimbabwe Dept Phys Harare Zimbabwe

A microcontroller-based multi-sensor temperature measurement and control system that uses a steady-state one-dimensional heat-flow technique for absolute determination of thermal conductivity of a rigid poor conductor using the guarded hot-plate method is described. The objective of this project was to utilize the latest powerful, yet inexpensive, technological developments, sensors, data acquisition and control system, computer and application software, for research and teaching by example. The system uses an ST6220 microcontroller and LM335 temperature sensors for temperature measurement and control. The instrument interfaces to a computer via the serial port using a Turbo C++ programme. LM335Z silicon semiconductor temperature sensors located at different axial locations in the heat source were calibrated and used to measure temperature in the range from room temperature (about 293 K) to 373 K. A zero and span circuit was used in conjunction with an eight-to-one-line data multiplexer to scale the LM335 output signals to fit the 0-5.0 V full-scale input of the microcontroller's on-chip ADC and to sequentially measure temperature at the different locations. Temperature control is achieved by using software-generated pulse-width-modulated signals that control power to the heater. This article emphasizes the apparatus's instrumentation, the computerized data acquisition design, operation and demonstration of the system as a purposeful measurement system that could be easily adopted for use in the undergraduate laboratory. Measurements on a 10 mm thick sample of polyurethane foam at different temperature gradients gave a thermal conductivity of 0.026 +/- 0.004 W m(-1) K-1.

关键词： thermal conductivity steady state polyurethane microcontroller pulse-width modulation temperature gradient

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Microcomputer Based Control of Frequency Regulator in Induction Motors

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IFAC Proceedings Volumes 2003年第1期36卷 61-66页

作者： George K. Adam Technological Educational Institute of Larissa Dept. of Information Technology and Telecommunications 41110 Larissa Greece.

The progress of semiconductor technology and control systems the last years has made possible the realisation of highly efficient and low priced microprocessor-based controllers for the control of asynchronous motors. This paper describes the design and realization of a microcomputer-based device for frequency regulation of an asynchronous motor. Through the regulation of motor's supply frequency is achieved regulation of its speed. The control is based on PWM method, with voltage feedback, and frequency regulation is performed in the range of 20Hz to 60 Hz. The application platform is an automatic industrial press machine in a machines constructions company.

关键词： microprocessor control motor control pulse-width modulation

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Control of a tilt table based on bio-signals

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IFAC Proceedings Volumes 2003年第15期36卷 251-253页

作者： Jongman Cho Jae Yong Seo Department of Biomedical Engineering Inje University Korea Kwangwon Meditec Busan Korea

This study is focused on the development of control unit of a tilt table designed for a rehabilitation patient who has been confined to bed for a long time and may be in orthostatic hypotension because blood vessels of the patient are not contracted by falloff of control function in the autonomic nervous system when the patient stands upright. The control unit of the tilt table suggested in this study monitors bio-signals of the patient and controls the tilting angle and speed so that the patient may not be in dangerous state.

关键词： Biomedical system Positioning systems pulse-width modulation Signal processing

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