• Latest
  • Trending
  • All
  • Capacitors
  • Resistors
  • Inductors
  • Filters
  • Fuses
  • Non-linear Passives
  • Applications
  • Integrated Passives
  • Oscillators
  • Passive Sensors
  • New Technologies
  • Aerospace & Defence
  • Automotive
  • Industrial
  • Market & Supply Chain
  • Medical
  • RF & Microwave
  • Telecommunication

Why corona-free custom magnetics solutions are needed

2.5.2016

Bourns Announces Four New High Power Ultra-Low Ohmic Current Sense Resistors

4.12.2023

November 2023 ECIA NA Electronic Components Sales Sentiment Setback in Attempted Recovery

4.12.2023

Wk 49 Electronics Supply Chain Digest

4.12.2023

Optimizing Tantalum Capacitor Manufacturing Through Yield Strength and Plasticity Analysis in Welding Processes

30.11.2023

Researchers Present New Record Energy Storage Carbon Material for Supercapacitors

30.11.2023

Q Factor Modelling; How Poles and Zeros Relate to Q Factor

30.11.2023
  • Home
  • Privacy Policy
  • EPCI Membership & Advertisement
  • About
No Result
View All Result
NEWSLETTER
Passive Components Blog
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Circuit Protection Devices
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • Market & Supply Chain
    • Market Insights
    • Medical
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors
    • Resistors
    • RF & Microwave
    • Telecommunication
    • Weekly Digest

    Bourns Announces Four New High Power Ultra-Low Ohmic Current Sense Resistors

    November 2023 ECIA NA Electronic Components Sales Sentiment Setback in Attempted Recovery

    Wk 49 Electronics Supply Chain Digest

    Optimizing Tantalum Capacitor Manufacturing Through Yield Strength and Plasticity Analysis in Welding Processes

    Researchers Present New Record Energy Storage Carbon Material for Supercapacitors

    Q Factor Modelling; How Poles and Zeros Relate to Q Factor

    Bourns Unveils New Data and Signal Surge Protective Devices

    Bourns Unveils Thermally Protected MOV Surge Protective Devices

     Exxelia Opens Manufacturing Site in Morocco

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos
    • Sensors

    Addressing EMC Issues; Texas Instruments and Würth Elektronik Webinar

    DC-Link Film Capacitors for DC-Charger Applications; WE Webinar

    Transformer Design for EMC; WE Webinar

    Filter Calculation and Selection with REDEXPERT EMI Filter Designer; WE Webinar

    Experimental Demonstration of Inductor Back Electromotive Force EMF

    Charging/Discharging of Linear andNon-linear Capacitors

    How to Select Inductor For Switching Power Supply

    Oscillators Integration, Selection Guide and Design In

    Input Capacitor Selection for Power Supplies – Part 3: Electrolytic Capacitors

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Suppliers
    • Preferred Suppliers
    • Who is Who
  • Events
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Circuit Protection Devices
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • Market & Supply Chain
    • Market Insights
    • Medical
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors
    • Resistors
    • RF & Microwave
    • Telecommunication
    • Weekly Digest

    Bourns Announces Four New High Power Ultra-Low Ohmic Current Sense Resistors

    November 2023 ECIA NA Electronic Components Sales Sentiment Setback in Attempted Recovery

    Wk 49 Electronics Supply Chain Digest

    Optimizing Tantalum Capacitor Manufacturing Through Yield Strength and Plasticity Analysis in Welding Processes

    Researchers Present New Record Energy Storage Carbon Material for Supercapacitors

    Q Factor Modelling; How Poles and Zeros Relate to Q Factor

    Bourns Unveils New Data and Signal Surge Protective Devices

    Bourns Unveils Thermally Protected MOV Surge Protective Devices

     Exxelia Opens Manufacturing Site in Morocco

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos
    • Sensors

    Addressing EMC Issues; Texas Instruments and Würth Elektronik Webinar

    DC-Link Film Capacitors for DC-Charger Applications; WE Webinar

    Transformer Design for EMC; WE Webinar

    Filter Calculation and Selection with REDEXPERT EMI Filter Designer; WE Webinar

    Experimental Demonstration of Inductor Back Electromotive Force EMF

    Charging/Discharging of Linear andNon-linear Capacitors

    How to Select Inductor For Switching Power Supply

    Oscillators Integration, Selection Guide and Design In

    Input Capacitor Selection for Power Supplies – Part 3: Electrolytic Capacitors

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Suppliers
    • Preferred Suppliers
    • Who is Who
  • Events
No Result
View All Result
Passive Components Blog
No Result
View All Result

Why corona-free custom magnetics solutions are needed

2.5.2016
Reading Time: 3 mins read
A A

source: EDN article

Steve Taranovich -April 26, 2016,  Many designers treat transformers as if they were “garden variety” resistors in so many designs. They just select one that meets the circuit need for transforming electrical energy from one circuit to another without a direct electrical connection using mutual induction between two windings and having the necessary isolation voltage needed for the system design. But there is more to a transformer than that.

RelatedPosts

Bourns Announces Four New High Power Ultra-Low Ohmic Current Sense Resistors

November 2023 ECIA NA Electronic Components Sales Sentiment Setback in Attempted Recovery

Wk 49 Electronics Supply Chain Digest

I met Kevin Bradley, Marketing Director, from Bicron Electronics Company, a Connecticut-based manufacturer of high-reliability, custom magnetics, at APEC this year. They announced an improvement in their line of VoltBoss™ corona-free transformers. Why is that important?

First of all, most engineers think of high voltage transmission lines when they hear the term corona. Have you heard of Corona bloom, a corrosive effect of partial discharge, is a leading cause of failure in magnetics components? Bicron’s new generation of VoltBoss™ transformers have been developed to eliminate corona failure (dielectric breakdown) for voltages up to 4.5kV in an amazingly small 1 sq. in. footprint.

This phenomena, frequently misunderstood by many designers as only applying to large, high voltage magnetics devices, is equally important in smaller magnetics devices in operating environments as low as 300V employed in equipment that must operate reliably over their lifetime – often decades.

Corona is caused by ionization of the media (usually air) surrounding an electrode /conductor. It is a function of the voltage and the surrounding relative humidity and air density. Corona is generated when a localized discharge resulting from the gaseous ionization in an insulation system when the voltage exceeds a critical value. That critical value was previously assumed to be about 1 kV but it can even be exhibited at levels down to 300V.

Corona inception voltage is the lowest voltage at which continuous corona of specified pulse amplitude occurs as the applied voltage is gradually increased. Corona inception voltage decreases as the frequency of the applied voltage increases. Corona can occur in applications as low as 300V.

Corona extinction or extinguish voltage is the highest voltage at which continuous corona of specified pulse amplitude no longer occurs as the applied voltage is gradually decreased from above the corona inception value. Thus, once corona starts, the voltage must be decreased to get it to stop.

Corona is not just a function of an Electric Field. It depends upon the surface and radius of curvature of the electrode/conductor. It is also dependent upon the rate of decay of the electric field away from the conductor/electrode. So the conductor with the smallest electric field at its surface is not the obvious solution.

The surface condition of the conductor is an important factor. Irregularities in the surface like dust, burrs, scratches and moisture are problems that will enhance the corona effect.

Bicron’s new transformer platform measuring just over 2 cu. in and weighing just 2.5 oz. achieves a partial discharge specification of an amazingly low level of <10 pC @ 4.5 kV.

The transformer’s manufacturing process, proprietary materials and designs assure best-in-class performance in minimizing partial discharge in mass-produced transformers, Kevin Bradley told me. This technology guards against field failures from poor designs, inferior materials as well as haphazard internal construction quality.  Partial discharge is considered as a discharge that does not complete the path between the cathode and the anode of an insulation system. Bicron says that corona is a further progression of partial discharge as voltage levels increase to a high enough level to create a “Corona Bloom” which can be a serious threat to the operation of the magnetic device itself as well as the system it resides in.

Bradley told me that VoltBoss™ transformers have been in field use by major US and overseas OEM’s for thousands of cycles with no failures.  With power ratings up to 200VA, input voltages up to 250V and partial discharge specifications as low as <5pC at on surprisingly small platforms, VoltBoss™ technology is available in board mounted units and larger toroid assemblies.

I got an eye-opening, new appreciation for the transformer after seeing what Bicron is doing with transformers and especially what they are doing to educate designers about these sometimes overlooked phenomena that can affect reliability and function in a system.

Related Posts

Resistors

Bourns Announces Four New High Power Ultra-Low Ohmic Current Sense Resistors

4.12.2023
10
Market & Supply Chain

November 2023 ECIA NA Electronic Components Sales Sentiment Setback in Attempted Recovery

4.12.2023
10
Weekly Digest

Wk 49 Electronics Supply Chain Digest

4.12.2023
16

Upcoming Events

Dec 5
15:00 - 16:00 CET

High Voltage Power Distribution Units and Fuse Selection Importance

Dec 6
11:00 - 12:00 CET

Miniaturization, mechatronics, microvia: SLIM.flex PCB

Dec 6
11:00 - 12:00 MST

DigiKey Webinar on Strategic Procurement for 2024

View Calendar

Popular Posts

  • Understanding High-Precision Resistor Temperature Coefficient of Resistance

    0 shares
    Share 0 Tweet 0
  • What is a Dielectric Constant of Plastic Materials ?

    4 shares
    Share 4 Tweet 0
  • Leakage Current Characteristics of Capacitors

    0 shares
    Share 0 Tweet 0
  • Ripple Current and its Effects on the Performance of Capacitors

    3 shares
    Share 3 Tweet 0
  • Capacitor Selection for Coupling and Decoupling Applications

    28 shares
    Share 28 Tweet 0
  • How to Select Ferrite Cores

    0 shares
    Share 0 Tweet 0
  • Inductors and RF Chokes Basics

    0 shares
    Share 0 Tweet 0
  • MLCC and Ceramic Capacitors

    0 shares
    Share 0 Tweet 0
  • Why Low ESR Matters in Capacitor Design

    0 shares
    Share 0 Tweet 0
  • Coefficient of Linear Thermal Expansion on Polymers Explained

    0 shares
    Share 0 Tweet 0

Newsletter Subscription

 

Archive

2023
2022
2021
2020
2019
2018
2017

Symposium

Passive Components Networking Symposium

Passives e-Learning

Knowledge Blog

  • Home
  • Privacy Policy
  • EPCI Membership & Advertisement
  • About

© EPCI - Premium Passive Components Educational and Information Site

No Result
View All Result
  • Home
  • News
  • Video
  • Knowledge Blog
  • Preferred Suppliers
  • Events

© EPCI - Premium Passive Components Educational and Information Site

This website uses cookies. By continuing to use this website you are giving consent to cookies being used. Visit our Privacy and Cookie Policy.