Trends in the use of digital technology for control and regulation of power supplies (original) (raw)
Related papers
An embedded power supply controller
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167), 1998
Several different models of high current power supplies are used to test accelerator magnets at the Fermilab's Development and Test Department (D&TD). Department-wide standardization of current control and monitoring has been achieved by embedding a proprietary intelligent device into each of these power supplies. The device is based on a highly integrated Intel 87C196 microcontroller that is used to control and monitor current, collect status information, issue control signals and communicate with a host computer. The controller interfaces with a power supply via onboard high precision ADC and DAC converters, and digital I/O registers. Some of the advanced features of the system include: downloading and interpreting of complex ramp profiles, built-in parabolic waveform approximation, external triggering, and fiber-optic communication media. Network access is enabled by an extensive set of UNIX tools such as GUI, ramp profile simulator, API library, and shell programming tools. 3464 0-7803-4376-X/98/$10.00
Digital control system for high precision power supplies of the new Brazilian synchrotron source
2013 Brazilian Power Electronics Conference, 2013
This paper proposes an architecture of digital current regulator intended to be used to control the power supplies of the new Brazilian synchrotron light source, called Sirius. It is based on a high-precision Digital to Analog Converter and a modern System on Chip device, which has the capability of performing realtime control tasks together with managing and interface tasks. Despite this system will be used to control many kinds of power supplies, it was validated in a 100 W power supply, which was previously developed to be used in the present Synchrotron Light Source.
Digital internal model control of high-precision power supply for particle accelerator magnets
2005
The paper presents the control of a power supply feeding a quadrupole magnet of a booster synchrotron. The supply equipment is based on a switching architecture where current sharing and interleaving techniques are adopted to minimize the voltage/current ripple. Internal model principle is exploited in the control design to guarantee extremely accurate tracking of the sinusoidal current reference for the quadrupole magnet. PWM-based digital solution is adopted instead of analog hysteresis one to avoid unpredictable behaviors of the current ripple and to allow a simple and reliable implementation of the proposed controller. Extensive simulations confirm satisfactory performances.
Digital control of power supplies-opportunities and constraints
1998
In this paper, we present a study of the opportunities and constraints of digital control in power supplies. The advantages and disadvantages between analog and digital controllers in switched-mode power supplies are discussed in detail. The effects of a digital controller on device's reliability and integration level are also discussed. A 48 V, 500 W rectifier having a switching frequency of 100 kHz was used as a practical case example. This switched-mode rectifier consists of two converter stages, i.e., AC/DC and DCDC converters. Dynamic characteristics for digital controllers in both converters were studied by extensive simulations. Based on the simulation results, the values of the required sampling frequencies were determined. According to the obtained results and careful analyses made in our study, it can be stated that digital control is certainly a viable alternative also in power supplies. However, before digital controllers will become dominant in high-volume power supply products, low cost microcontrollers or signal processors, which are tailored for the specific application, are needed to reduce the existing cost barrier.
High Resolution Analog / Digital Power Supply Controller
2003
Corrector magnets for the SPEAR-3 synchrotron radiation source require precision, high-speed control for use with beam-based orbit feedback. A new Controller Analog/Digital Interface card (CANDI) has been developed for these purposes. The CANDI has a 24-bit DAC for current control and three 24-bit ∆-Σ ADCs to monitor current and voltages. The ADCs can be read and the DAC updated at the 4 kHz rate needed for feedback control. A precision 16-bit DAC provides on-board calibration. Programmable multiplexers control internal signal routing for calibration, testing, and measurement. Feedback can be closed internally on current setpoint, externally on supply current, or beam position. Prototype and production tests are reported in this paper. Noise is better than 17 effective bits in a 10 mHz to 2 kHz bandwidth. Linearity and temperature stability are excellent.
Digital control of high performance power supplies for a synchrotron light source
Lecture Notes in Control and Information Sciences, 2007
This volume can be considered a direct outcome of the special scientific "meetingin-the-fortress" on "Advances in Control Theory and Applications" organized in Bertinoro, Italy, by the Centre of research on Complex Automated Systems (CASY), Department of Electronics Computer and Systems of the University of Bologna, during the week May 22-26, 2006. The inspiring idea of that workshop was to provide a forum for exchange of ideas between theory-oriented and application-oriented researchers working on various systems and control problems. The meeting offered an opportunity for formal presentations of research results as well as for informal discussions about ideas and problems, case-studies, limitations and potentials of existing and emerging theories. The main goal of the meeting was to facilitate cross-fertilization between different theoretical and applicative areas. Emphasis was put on identification of new theoretical developments and research directions, as needed by recent progresses in applications and problems which are still looking for a theoretical support and effective rigorous solutions. The technical programme consisted of twenty-five main lectures delivered by distinguished scholars and was complemented by a number of poster presentations prepared by post doctoral fellows and PhD students currently working at CASY. Out of the twenty five lectures given in Bertinoro, fifteen are reported here in written form. They are organized as separate contributions and listed according to the alphabetic order of the first author, as follows. Modeling and Control of Autonomous Helicopters by Manuel Béjar, Anibal Ollero, Federico Cuesta, presents an overview on the modeling and model-based control of autonomous helicopters. Efficient Quantization in the Average Consensus Problem by Ruggero Carli, Sandro Zampieri deals with the average consensus problem where a set of linear systems has to be driven to the same final state which corresponds to the average of their initial states. Human-Robot Interaction Control Using Force and Vision by Agostino De Santis, Vincenzo Lippiello, Bruno Siciliano, Luigi Villani focuses on techniques for augmenting safety by means of control systems, starting from the idea of mimicking sensing and actuation of humans.
Modern accelerator control systems
2007 IEEE Particle Accelerator Conference (PAC), 2007
Modern approaches to accelerator control systems are discussed on the basis of several criteria including software and hardware implications while maintaining reliability under changing requirements.
2020
The Advanced Light Source (ALS) is a third generation synchrotron light source that has been operating since 1993 at Berkeley Lab. A few years ago, the ALS was upgraded to achieve Top-Off Mode, which required replacing the booster dipole and quadrupole magnet power supplies to increase the peak booster beam energy from 1.5GeV to 1.9GeV. The original analog controller for each power supply has been replaced by a digital power supply controller (DPSC) to improve stability and resolution and provide a remote interface
Development of a Power Quality Conditioning System for Particle Accelerators
2019
CERN is frequently experiencing power quality problems caused by transient voltage dips originating from the outside grid, causing issues with electrical equipment and, in the worst case, tripping the particle accelerators. This thesis will prove the feasibility and develop a power quality conditioning system to mitigate these voltage dips to ensure satisfactory power quality for CERN today, and in the future for even larger particle accelerators. The mitigation system is based on the back-to-back HVDC converter concept and, as the nature of the electrical network of CERN is entirely passive, the converter is operating as a remote-end converter. The purpose of this converter is to supply constant power during voltage dips occurring in the upstream network, and thus, completely decouple CERN from the grid. The topology of choice is concluded to be the HVDC modular multilevel converter, which has the added benefits of being able to connect to weak AC networks. In addition, it possesse...