Transients and Electrical Overstress Protection in Electronic Systems

מק"ט: #50108 | משך קורס: 24 שעות אק'

Electrical transients and overstress, such as that generated by lightning, electromagnetic pulses from nuclear weapons and switching of reactive loads, can cause failure, permanent degradation, or temporary malfunction (upset) and even severe damage to electronic devices and systems.
Cost effective protection of industrial, military and consumer electronic systems from these overstresses are of great importance.
Due the increasing necessity for transient protection, in commercial, industrial and consumer systems, in particular - in telecommunication and medical applications, a wide range of international standards regarding transient and electrical ovestress immunity have been developed (e.g., IEC-1000-4-4 and -5, ETS-300-386, FCC Part 68, and many others) and are incorporated in directives and laws (e.g., the EEC EMC Directive, The EEC Medical Devices Directive, etc.) due to the safety aspects related to these effects. Meeting the Transient and Electrical overstress is therefore both a technical necessity as well as a legal requirement.
The extensive use of modern electrical and electronic equipment in all aspects of our life, and the increased sensitivity of the new technologies used for electronic and telecommunication systems, requires the incorporation of adequate and cost-effective protection measures against the harmful effects of electrical overstress and transients into the equipment and installations.
The lack or shortcoming of proper transient immunity design measures, had often led to reduced operation reliability of equipment, increased maintenance costs and even extensive damages to facilities and safety hazards to personnel.

*שדות חובה
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This three-day Course provides the trainees with the fundamental understanding of electrical transient and overstress phenomena in equipment, systems and installations, and the military and commercial standards governing transient protection.
In particular, the instructor will familiarize the attendees with the basic concepts and parameters of transients and transient waveforms and the methods for estimating the energy contents in the transients.
The Course will provide the engineering know-how, to describe transient mitigation techniques and to provide the technical tools enabling the engineer to design product immunity to transients and electrical overstress in the electronic circuits and installations, in order to meet the applicable standards and codes.
The Course will emphasize the basic principles and practical applications, with mathematical derivations and calculations kept to the minimum necessary. In addition, case histories and practical examples from “real life” will be provided.


  • Obtain a fundamental knowledge of the electrical transient and overstress phenomena and their effects
  • Gain knowledge on transient specifications and standards, and the application of the standards
  • Learn how to estimate or derive the susceptibility levels of electrical and electronic circuits to transients and electrical overstress
  • Study the characteristics of basic protection devices, and obtain the knowledge to design advanced topologies of protection circuits

קהל יעד

The Course is intended for electrical, electronic and computer and process control engineers, who are involved in the design and development, qualification or engineering management of electronic and electrical equipment and systems. In particular - The Course is intended for Engineers involved in the design of power and communication systems, or equipment connected to such networks, thereby exposed to transients, e.g. surges from lightning (L-EMP), Nuclear EMP (N-EMP) and other sources.

תנאי קדם

Basic understanding of electronic components and circuits


Basic Concepts

  • Basic concepts in electromagnetic compatibility, sources, victims and coupling modes
  • Nature, sources and characterization of electromagnetic transient, overstress phenomena and threats
  • α/β - notation in surge definitions, rise time, front time and pulse duration
  • Coupling and propagation of overvoltages, common and differential mode coupling and signals


Effects of Transients on Components/Circuits

  • Characterization of electrical transient effects on circuits. Failure and permanent damage
  • Damage and Upset thresholds of electronic components
  • Models for evaluating the damage threshold of components/circuits


Transient Standards and Specifications

  • Commercial and military overstress protection standards
  • IEC-1000-4-X, FCC Part 68 and ANSI C62.41 Series
  • MIL-STD-461
  • Standard overstress waveforms, e.g., 5/50, 1.2/50. 8/20. 10/700, Ring Wave, Damped Sinosoid, etc.


Energy Consideration in Transients and Overstress

  • Energy Contents and Energy Transfer in Transients; the Action Integral
  • Energy Dissipation in Protection Devices


Spectral Representation of Transients

  • Spectral representation of Transients
  • The implications of spectral representation on the protection design


Zoning and Protection Topologies

  • Overview of surge protection concepts and techniques
  • Application of the “Zoning” concept to transient protection from circuit to system to installation


Principles of Transient/Electrical Overstress Protection

  • Surge protection principles: Blocking, Diversion, Limiting and Filtering
  • Principle protection topologies: Series and Shunt devices
  • Surge protection devices: Requirements from ideal circuits
  • Practical protection devices: linear and non-linear devices
  • Primary parameters of non-linear protection devices


Transient/Electrical Overstress Protection Devices

  • Spark Gap
  • Varistor, Metal Oxide Varistor (MOV)
  • Avalanch Diodes
  • Switching and Rectifier Diodes
  • Thyristors/Sidactors
  • Optical Isolators
  • Linear filters and isolation transformers


Transient/Electrical Overstress Protection Circuits

  • The need for hybrid protection circuits
  • Classical transient protection circuits
  • Unique transient protection circuits
  • Transient/Electrical Overstress Protection Design
  • Transient/Electrical Overstress Protection Design Methodology
  • Designing simple protection circuits
  • Designing hybrid protection circuits
  • Installation of Transient Protection Components


Transient/Electrical Overstress Protection Testing and Validation

  • Standards for Transient/Electrical Overstress Protection Testing and Validation
  • Validation of overstress protection - Testing and evaluation techniques


Summary, Q&A