23,433 research outputs found
One-Quadrant Switched-Mode Power Converters
This article presents the main topics related to one-quadrant power
converters. The basic topologies are analysed and a simple methodology to
obtain the steady-state output-input voltage ratio is set out. A short
discussion of different methods to control one-quadrant power converters is
presented. Some of the reported derived topologies of one-quadrant power
converters are also considered. Some topics related to one-quadrant power
converters such as synchronous rectification, hard and soft commutation, and
interleaved converters are discussed. Finally, a brief introduction to resonant
converters is given.Comment: 25 pages, contribution to the 2014 CAS - CERN Accelerator School:
Power Converters, Baden, Switzerland, 7-14 May 201
Requirements for Power Converters
This paper introduces the requirements for power converters needed for
particle accelerators. It describes the role of power converters and the
challenges and constraints when powering magnets. The different circuit layouts
are presented as well as the operating cycles. The power converter control and
high precision definition are also introduced. This paper lists the key circuit
parameters to be taken into consideration to properly specify a power converter
that can be compiled in a functional specification.Comment: 14 pages, contribution to the 2014 CAS - CERN Accelerator School:
Power Converters, Baden, Switzerland, 7-14 May 201
Passive Power Filters
Power converters require passive low-pass filters which are capable of
reducing voltage ripples effectively. In contrast to signal filters, the
components of power filters must carry large currents or withstand large
voltages, respectively. In this paper, three different suitable filter
structures for d.c./d.c. power converters with inductive load are introduced.
The formulas needed to calculate the filter components are derived step by step
and practical examples are given. The behaviour of the three discussed filters
is compared by means of the examples. Practical aspects for the realization of
power filters are also discussed.Comment: 25 pages, contribution to the 2014 CAS - CERN Accelerator School:
Power Converters, Baden, Switzerland, 7-14 May 201
Controls and Interfaces
Reliable powering of accelerator magnets requires reliable power converters
and controls, able to meet the powering specifications in the long term. In
this paper, some of the issues that will challenge a power converter controls
engineer are discussed.Comment: 16 pages, contribution to the 2014 CAS - CERN Accelerator School:
Power Converters, Baden, Switzerland, 7-14 May 201
Analysis of an On-Line Stability Monitoring Approach for DC Microgrid Power Converters
An online approach to evaluate and monitor the stability margins of dc microgrid power converters is presented in this paper. The discussed online stability monitoring technique is based on the Middlebrook's loop-gain measurement technique, adapted to the digitally controlled power converters. In this approach, a perturbation is injected into a specific digital control loop of the converter and after measuring the loop gain, its crossover frequency and phase margin are continuously evaluated and monitored. The complete analytical derivation of the model, as well as detailed design aspects, are reported. In addition, the presence of multiple power converters connected to the same dc bus, all having the stability monitoring unit, is also investigated. An experimental microgrid prototype is implemented and considered to validate the theoretical analysis and simulation results, and to evaluate the effectiveness of the digital implementation of the technique for different control loops. The obtained results confirm the expected performance of the stability monitoring tool in steady-state and transient operating conditions. The proposed method can be extended to generic control loops in power converters operating in dc microgrids
Regulation Theory
This paper reviews the design of regulation loops for power converters. Power
converter control being a vast domain, it does not aim to be exhaustive. The
objective is to give a rapid overview of the main synthesis methods in both
continuous- and discrete-time domains.Comment: 23 pages, contribution to the 2014 CAS - CERN Accelerator School:
Power Converters, Baden, Switzerland, 7-14 May 201
Power Converters and Power Quality
This paper discusses the subject of power quality for power converters. The
first part gives an overview of most of the common disturbances and power
quality issues in electrical networks for particle accelerators, and explains
their consequences for accelerator operation. The propagation of asymmetrical
network disturbances into a network is analysed. Quantitative parameters for
network disturbances in a typical network are presented, and immunity levels
for users' electrical equipment are proposed. The second part of this paper
discusses the technologies and strategies used in particle accelerator networks
for power quality improvement. Particular focus is given to networks supplying
loads with cycling active and reactive power.Comment: 26 pages, contribution to the 2014 CAS - CERN Accelerator School:
Power Converters, Baden, Switzerland, 7-14 May 201
Power Converters in Power Electronics
In recent years, power converters have played an important role in power electronics technology for different applications, such as renewable energy systems, electric vehicles, pulsed power generation, and biomedical sciences. Power converters, in the realm of power electronics, are becoming essential for generating electrical power energy in various ways. This Special Issue focuses on the development of novel power converter topologies in power electronics. The topics of interest include, but are not limited to: Z-source converters; multilevel power converter topologies; switched-capacitor-based power converters; power converters for battery management systems; power converters in wireless power transfer techniques; the reliability of power conversion systems; and modulation techniques for advanced power converters
Power Converters for Accelerators
Particle accelerators use a great variety of power converters for energizing
their sub-systems; while the total number of power converters usually depends
on the size of the accelerator or combination of accelerators (including the
experimental setup), the characteristics of power converters depend on their
loads and on the particle physics requirements: this paper aims to provide an
overview of the magnet power converters in use in several facilities worldwide.Comment: 30 pages, contribution to the 2014 CAS - CERN Accelerator School:
Power Converters, Baden, Switzerland, 7-14 May 201
- …