Passive Components Blog
No Result
View All Result
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Circuit Protection Devices
    • electro-mechanical news
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • inter-connect news
    • Market & Supply Chain
    • Market Insights
    • Medical
    • Modelling and Simulation
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors News
    • Resistors
    • RF & Microwave
    • Telecommunication
    • Weekly Digest

    Bourns Releases High Current Metal Alloy-based, Multilayer Power Chip Inductors

    Smiths Interconnect Extends Space-Qualified, High-Reliability Fixed Chip Attenuators 

    Samtec Expands Offering of Slim, High-Density HD Array Connectors

    Bourns Unveils High-Precision Wirewound Resistor with Long-Term Stability

    Common Mode Chokes Selection for RF Circuits in Next-Generation Communication Systems

    Capacitor Self-balancing in a Flying-Capacitor Buck Converter

    Littelfuse Acquires Basler Electric Enhancing High-Growth Industrial Market

    DigiKey Grows Inventory with Over 31K New Stocking Parts in Q3 2025

    Murata Expands Automotive Metal Frame Y2/X1 Safety MLCC Capacitors to 500V

    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
    • Circuit Protection Video
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Inter-Connect Video
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos

    Common Mode Chokes Selection for RF Circuits in Next-Generation Communication Systems

    Capacitor Self-balancing in a Flying-Capacitor Buck Converter

    How to Select Ferrite Bead for Filtering in Buck Boost Converter

    Power Inductors Future: Minimal Losses and Compact Designs

    Percolation Phenomenon: Degradation of Molded Power Inductors in DC/DC Converters

    Connector PCB Design Challenges

    Efficient Power Converters: Duty Cycle vs Conduction Losses

    Ripple Steering in Coupled Inductors: SEPIC Case

    SEPIC Converter with Coupled and Uncoupled Inductors

    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
    • Who is Who
  • PCNS
    • PCNS 2025
    • PCNS 2023
    • PCNS 2021
    • PCNS 2019
    • PCNS 2017
  • Events
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Circuit Protection Devices
    • electro-mechanical news
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • inter-connect news
    • Market & Supply Chain
    • Market Insights
    • Medical
    • Modelling and Simulation
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors News
    • Resistors
    • RF & Microwave
    • Telecommunication
    • Weekly Digest

    Bourns Releases High Current Metal Alloy-based, Multilayer Power Chip Inductors

    Smiths Interconnect Extends Space-Qualified, High-Reliability Fixed Chip Attenuators 

    Samtec Expands Offering of Slim, High-Density HD Array Connectors

    Bourns Unveils High-Precision Wirewound Resistor with Long-Term Stability

    Common Mode Chokes Selection for RF Circuits in Next-Generation Communication Systems

    Capacitor Self-balancing in a Flying-Capacitor Buck Converter

    Littelfuse Acquires Basler Electric Enhancing High-Growth Industrial Market

    DigiKey Grows Inventory with Over 31K New Stocking Parts in Q3 2025

    Murata Expands Automotive Metal Frame Y2/X1 Safety MLCC Capacitors to 500V

    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
    • Circuit Protection Video
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Inter-Connect Video
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos

    Common Mode Chokes Selection for RF Circuits in Next-Generation Communication Systems

    Capacitor Self-balancing in a Flying-Capacitor Buck Converter

    How to Select Ferrite Bead for Filtering in Buck Boost Converter

    Power Inductors Future: Minimal Losses and Compact Designs

    Percolation Phenomenon: Degradation of Molded Power Inductors in DC/DC Converters

    Connector PCB Design Challenges

    Efficient Power Converters: Duty Cycle vs Conduction Losses

    Ripple Steering in Coupled Inductors: SEPIC Case

    SEPIC Converter with Coupled and Uncoupled Inductors

    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
    • Who is Who
  • PCNS
    • PCNS 2025
    • PCNS 2023
    • PCNS 2021
    • PCNS 2019
    • PCNS 2017
  • Events
No Result
View All Result
Passive Components Blog
No Result
View All Result

EMI Filtering: How to Suppress Triacs EMI and RFI Noise

8.8.2022
Reading Time: 2 mins read
A A

Triacs and thyristors (silicon-controlled rectifiers, or SCRs) are used in power-switching applications because these can handle high voltages and currents. Triac switching circuits are more prone to noise creating a burst of electric pulses that cause electromagnetic interference (EMI) and radio frequency interference (RFI) in the circuit. Read how to design EMI filtering and suppress this impact.

Noise is generated in all semiconductor devices including triacs. Triacs are used in such power-switching applications as inverter- or motor-control circuits. Triacs and thyristors (silicon-controlled rectifiers, or SCRs) are used in power-switching applications because these can handle high voltages and currents.

RelatedPosts

Bourns Releases High Current Metal Alloy-based, Multilayer Power Chip Inductors

Smiths Interconnect Extends Space-Qualified, High-Reliability Fixed Chip Attenuators 

Samtec Expands Offering of Slim, High-Density HD Array Connectors

A typical triac application circuit is shown in Fig. 1. Basically, a triac has two thyristors—one conducts during positive half cycle of input voltage and the other during negative half cycle. When the gate terminal is triggered, current can flow either from MT1 to MT2, or from MT2 to MT1.

Typical triac switching application circuit
Figure 1: Typical triac switching application circuit

Trigger voltage (VGT) applied to the gate terminal can either be positive or negative with respect to MT2. But these do not trigger symmetrically, causing differences in positive and negative half cycles of the output. This leads to high level harmonics inducing noise and causes electromagnetic interference (EMI) in the circuit.

Triac switching circuits are more prone to noise because when load is turned on, current rises from zero to maximum value suddenly, creating a burst of electric pulses that cause radio frequency interference (RFI). The larger the load current, the worse will be the interference.

In electrically-noisy environments, spurious gate triggering can occur if noise voltage on the gate exceeds VGT and enough gate current flows to initiate regenerative action within the triac.

Harmonics are strong enough to create malfunctions and errors in sensitive electronic devices like computers. The little noise induced in power lines of the PCs may create problems in the most unpredictable ways.

Some ways to minimise noise in a triac circuit are:

  1. Keep gate connections as short as possible. If these are hard-wired, you can use twisted pair wires or even shielded cables to minimise noise pickup.
  2. Add a suitable resistor between the gate and MT1 to reduce gate sensitivity.
  3. Mount the triac leaded package down flat on the PCB or cabinet to stop any vibration-causing noise.
  4. Place a diac at the gate of triac for cleaner switching.
  5. Use an RC snubber circuit between MT1 and MT2 to prevent premature triggering caused by voltage spikes in the AC supply or inductive loads such as motors.
  6. Use a gate filter to reduce noise coming from AC mains.

Related

Source: ElectronicsForu

Recent Posts

Common Mode Chokes Selection for RF Circuits in Next-Generation Communication Systems

30.10.2025
6

Capacitor Self-balancing in a Flying-Capacitor Buck Converter

30.10.2025
5

How to Select Ferrite Bead for Filtering in Buck Boost Converter

23.10.2025
41

Power Inductors Future: Minimal Losses and Compact Designs

30.10.2025
49

Percolation Phenomenon: Degradation of Molded Power Inductors in DC/DC Converters

30.10.2025
53

High Energy Density Polymer Film Capacitors via Molecular and Interfacial Design

15.10.2025
32

Over-Voltage Protection Clippers, Clampers, Snubbers, DC Restorers

13.10.2025
42

Silicon Capacitors Market: Shaping the Foundation for Next-Gen Miniaturization Electronics

10.10.2025
87

Enhancing Energy Density in Nanocomposite Dielectric Capacitors

9.10.2025
44

Advances in the Environmental Performance of Polymer Capacitors

8.10.2025
68

Upcoming Events

Nov 4
10:00 - 11:00 PST

Design and Stability Analysis of GaN Power Amplifiers using Advanced Simulation Tools

Nov 4
November 4 @ 12:00 - November 6 @ 14:15 EST

Wirebond Materials, Processes, Reliability and Testing

Nov 6
14:30 - 16:00 CET

Self-healing polymer materials for the next generation of high-temperature power capacitors

View Calendar

Popular Posts

  • Buck Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Boost Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Flyback Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • LLC Resonant Converter Design and Calculation

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

    3 shares
    Share 3 Tweet 0
  • MLCC and Ceramic Capacitors

    0 shares
    Share 0 Tweet 0
  • Dual Active Bridge (DAB) Topology

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

    4 shares
    Share 4 Tweet 0
  • SEPIC Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Flying Capacitors

    0 shares
    Share 0 Tweet 0

Newsletter Subscription

 

Passive Components Blog

© EPCI - Leading Passive Components Educational and Information Site

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

No Result
View All Result
  • Home
  • Knowledge Blog
  • PCNS

© EPCI - Leading 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.
Go to mobile version