Category: EMI FILTERS

Electromagnetic Interference is known to wreak havoc on electronic systems as its emergence is inevitable. These interferences can disrupt signals and power lines, leading to malfunctions and reduced performance in electronic devices. Elcom, being one of the prominent EMI filter suppliers in India presents a revolutionary solution to conquer these interference challenges – EMI filters. EMI filters act as passive guardians suppressing conducted interference in signals or power lines.

What is an EMI filter?  

In technical terms, a filter is a device that separates waves, typically possessing two ports: an input signal and an output signal. Filters are vital electronic components that transmit power from the power supply to the equipment while attenuating EMI electromagnetic interference signals transmitted through the power supply. They protect the equipment from potential harm while effectively controlling the equipment’s electromagnetic interference.  

Why Should We Use EMI filters?  

The increasing complexity of electronic systems and the widespread use of various devices have led to a surge in electromagnetic interference. This interference can cause disruptions, malfunctions, or even damage sensitive electronic components. An EMI filter offers an effective solution to this problem by significantly reducing or eliminating electromagnetic interference, thereby ensuring optimal performance and reliability of electronic devices. 

How does an EMI filter function? 

EMI Filters provide a low-pass filtering action, allowing lower-frequency signals to pass through while attenuating higher-frequency EMI signals. The effectiveness of an EMI filter is determined by its ability to suppress unwanted noise while causing minimal signal distortion. Appropriate EMI filter selection depends on the specific functionality required in a given application. 

Factors to Consider While Selecting an EMI Filter: 

1. Frequency Range: Choose an EMI filter with a cutoff frequency that aligns with the frequency range of the interference you want to suppress. 

2. Insertion Loss: Look for filters with higher insertion loss values, as they offer greater attenuation of EMI signals. 

3. Current Rating: Ensure the filter’s current rating matches or exceeds the maximum current the device or circuit will draw. 

4. Voltage Rating: Select a filter with a voltage rating suitable for the application to handle transient voltage spikes. 

5. Package Size: Consider the available space and the filter’s package size, especially in compact electronic devices.  

6. Filter Topology: Different filter topologies, such as single-stage or multi-stage filters, may suit specific applications better.  

Applications of EMI Filters: 

EMI filters find versatile applications in diverse industries and electronic systems, each serving a specific purpose to ensure optimal performance and reliability. Here are some key applications and the types of filters used in each case: 

1. Reforming RGB display:  

EMI filters are essential to enhance display quality by reducing electromagnetic interference that can cause visual artifacts or noise in the image. Commonly, low-pass filters are utilized in RGB displays to suppress high-frequency noise, ensuring a clear and crisp image output.  

2. Medical Imaging or Diagnostic/ Patient Devices: 

In Medical Imaging and diagnostic devices, precision and accuracy are of utmost significance. An EMC filter is employed to eliminate electromagnetic interference, which could otherwise affect the accuracy of medical imaging results or jeopardize patient safety. High-performance low-pass filters are commonly utilized in these applications to attenuate unwanted high-frequency noise.  

3. Smart Battery Charger Circuit: 

EMI filters play a significant role in Smart Battery Chargers in circuits to optimize charging efficiency and prevent electromagnetic interference that could adversely impact the charging process or introduce noise in the electrical signals. The filters used in these circuits are designed to suppress high-frequency noise and provide stable charging performance.  

4. AM Radio Circuit: 

AM radio circuits are susceptible to interference from various sources, such as nearby electronic devices or power lines. EMI filters, typically low-pass filters, are integrated into AM radio circuits to reduce static and unwanted noise, leading to clearer reception and better audio quality.  

5. FM Radio Circuit: 

Similar to AM circuits, FM radio circuits require EMI filters to enhance the signal quality by reducing interference and noise. Low-pass filters are commonly employed in FM radio circuits to allow the desired frequency range while attenuating unwanted higher frequencies. 

6. Television, Switched Mode Power Supply Circuit: 

EMI filters play an important role in televisions to enhance picture and sound quality by reducing electromagnetic interference. In switched-mode power supply circuits within televisions, EMI filters are used to ensure stable power delivery while suppressing high-frequency noise, preventing disruptions in the display or audio output.  

7. High-Frequency Power Converters: 

High-frequency power converters are used in various applications, including renewable energy systems and industrial equipment. EMI filters are needed in these converters to ensure efficient power transfer while preventing electromagnetic interference that could impact the converter’s performance or cause malfunctions in connected devices.  

EMI RFI filters are indispensable components in various electronic applications, safeguarding devices and systems from electromagnetic interference while optimizing performance and reliability. The type of filter used in each application is carefully chosen to suit the specific frequency range and performance requirements, ensuring seamless operation and improved overall functionality.  

Elcom International stands out as a reliable Emi filter manufacturer in India. Our products cater to Indian and global markets, meeting diverse market demands. One significant advantage of choosing Elcom International as your EMI Manufacturer is our customer-centric approach, offering customization options tailored to specific EMI filter requirements.

Did you know that one of the key challenges of power management is low electromagnetic interference (EMI)? Along with low power density, accuracy, IQ, noise, and isolation, the low EMI power trend simplifies engineers’ designs and qualification processes and minimizes power supply interference with other system components.

Elcom International is one of the leading EMI filter manufacturers in India that helps engineers overcome the key challenges of low electromagnetic interference (EMI) in their designs. With a focus on low power density, accuracy, IQ, noise, and isolation, Elcom International’s products are designed to simplify the qualification process and minimize power supply interference with other system components.

Engineers and other individuals must be able to recognize and comprehend the various causes and sources of EMI, whether natural or man-made. Understanding EMI can help prevent temporary disturbances, system data loss, and failures and save lives. To learn more about EMI and its impact, please continue reading below.

What Is EMI And Its Source?

Electromagnetic interference (EMI) is a well-known cause of disruption and undesirable response, leading to under and overvoltage, peaks, and transients that can negatively impact communication networks. The gradual degradation of equipment and components due to EMI represents one of the most significant challenges industries faces. This challenge can result in substantial long-term costs and operational issues, such as equipment failure and reduced system efficiency.

What is an EMI Filter?

An EMI EMC filter is designed to suppress Electromagnetic Interference generated by electrical and electronic equipment. By attenuating or removing unwanted signals in a specific frequency range, the EMI filter allows the desired signals to pass through, helping to ensure optimal system performance and minimize the negative impacts of EMI.

How does an EMI filter work?

EMI RFI filters utilize a combination of inductors, capacitors, and resistors to suppress Electromagnetic Interference effectively. The inductors block high-frequency noise, while the capacitors conduct high-frequency signals to the ground. Additionally, the resistors help dampen high-frequency signals that could otherwise reflect into the circuit, allowing the EMI filter to provide optimal performance in reducing unwanted noise and Interference. 

Benefits of EMI Filters in Industrial Applications

1. Protection of equipment

EMI filters protect sensitive equipment from high-frequency noise that can cause malfunctions or damage. By reducing EMI, the filter can improve the longevity of the equipment.

2. Compliance with regulations

EMI filters are essential in industrial applications to comply with regulatory requirements. Many countries have strict EMI regulations, and non-compliance can lead to penalties or even a production line shutdown.

3. Improved system reliability

EMI filters can help improve the system’s overall reliability by reducing EMI-related errors or malfunctions. This increased reliability can lead to lower maintenance and repair costs.

Types of EMI Filters

1. Single-stage filters

Single-stage EMI filters are composed of a single circuit that filters common mode (CM) or differential mode (DM) noise. Single-stage filters are used when the noise levels are not very high.

2. Multi-stage filters

Multi-stage EMI filters use multiple filtering circuits to reduce noise levels. They are used when the noise levels are high or specific filtering requirements are needed.

Key Parameters for Selecting EMI Filters

1. Frequency range

The frequency range of the EMI filter must be compatible with the frequency range of the equipment it is protecting.

 2. Insertion loss

Insertion loss is the amount of signal attenuation caused by the filter. The insertion loss must be low enough not to impact the performance of the equipment.

 3. Rated current

The rated current represents the maximum current that an EMI filter can effectively handle. It is essential to select an EMI filter with a rated current that matches the equipment it is protecting.

4. Rated Voltage.

 Maximum safe operating level for effective electromagnetic interference suppression, safeguarding electronic devices from unwanted interference. Crucial for device protection.  

5. Mounting,

Mounting is the installation of EMI filters on electronic devices to reduce electromagnetic interference, ensuring smooth device operation. Proper mounting enhances filter effectiveness, safeguarding sensitive components from unwanted electromagnetic noise.

6. Connection Terminals.

The connection terminal in an EMI filter is the interface that allows the filter to link with the electronic circuit, capturing and suppressing electromagnetic noise to protect sensitive components and ensure device functionality. It consists of input and output connections for power and signal lines.

Elcom International is at the forefront of being one of the most prominent EMI filter suppliers in India, offering innovative solutions that help engineers overcome the challenges of low EMI power. Elcom International specializes in the design and production of electromechanical and electronic components, with a strong focus on delivering world-class products. As a leading EMI filter manufacturer in India, Elcom International leverages extensive research and advanced technology to ensure the highest quality standards in compliance with industry standards and manufacturing practices. With a proven track record of reliability, Elcom International is a trusted partner for companies seeking high-quality EMI filters.

Quick Overview of the basics of EMI EMC filters 

The EMI EMC filter is a device that attenuates electromagnetic interference from the power system to limit the noise in the system. -. The ability of an  EMC filter is to suppress EMI ( electromagnetic interference) from  the environment and lowers the risk of malfunctioning of an equipment.

The EMI EMC filter is a product that can be used in different  industrial applications.i.-EMI EMC filters are used in the following sectors: Aerospace, Automotive and trucking, Construction and infrastructure, defence, space, and security (DS&S), home appliances, printing machines, currency counting machine, drive applications, electrical panels, SMPS, UPS, Inverters, Electric Vehicles, etc. 

What are EMI EMC filters? 

EMI EMC filters are high-quality microwave frequency filters used in electronic devices. They are designed to reduce electromagnetic interference (EMI) generated by any flux inducing equipment or any other rational- sources such as  mobile phones, Wi-Fi routers or base stations, and other radio equipment. The EMI EMC filter suppresses and limits these noise signals from entering any  device, preventing any damages caused by interference with sensitive circuitry inside the product. EMI filters are also helpful in protecting high-voltage equipment, and other sources of unwanted interference. 

Applications of EMI EMC filters 

EMI can be caused by power lines, high voltages, or even radio waves emitted by other devices such as cell phones and wireless networks. These emissions cause problems with your computer’s motherboard or internal wiring system because they interfere with properly operating your computer’s components. This can lead to overheating, malfunctioning parts, poor performance, and more severe damage. They protect sensitive electronic equipment from harmful electromagnetic interference (EMI). EMI filters are widely used in industrial, commercial, and residential applications for safety purposes.  

EMI EMC filters are used in power electronics, medical and communications equipment, military electronics, and industrial applications. They can also be found in consumer electronics, Microwave ovens; Amplifiers and other amplifiers (TV sets); Microwave ovens with remote controls; Cable TV distribution systems.  

The most common application of EMI EMC filters is in power converters (PCs).  Switch mode power converters (PWM) often  deliver AC power from a variable frequency supply at the desired voltage level. These PWM modules have an input stage that operates at high frequencies, followed by an output stage at low frequencies or zero crossing detection (ZC). 

• Applications requiring  for low leakage currents, e.g., battery-powered devices 

The EMC filter is a valuable component for battery-powered devices. It can be used to protect the battery from damage caused by high leakage currents, and it can also be used to protect other parts of the circuit. 

• High-reliability applications,  e.g., aerospace and military.

  In high-reliability applications EMI EMC filters protect sensitive equipment from noise generated by neighboring electrical equipment.

EMC filters are designed to attenuate the EMI emitted by various sources. They can be used in many applications, such as amplifiers and power supplies, audio amplifiers and speakers (to reduce noise), power injectors for hybrid vehicles, etc. The range of EMI EMC filters includes versatile, durable, and efficient single-phase, three-phase, dc, power cord, etc.   

About Elcom:  Elcom International is one of the most reliable electronic components suppliers in India. Emerging as a prominent EMI filter supplier and manufacturer in India, Elcom International has acquired years of experience and specialized expertise in EMI RFI filter manufacturing technologies. Leveraging technological advancements backed by robust research, Elcom International makes premium products available, from designing, developing, and manufacturing to serving a range of specified customer requirements across the market. Owing to the innovative technology derived from years of extensive research and experience, Elcom International, an EMI filter supplier in India, provides highly versatile, durable, and efficient EMI RFI filters. Assuring top quality products, premium than any similar ranged product available in the market, Elcom International wins an edge in the market owing to its minimal maintenance and highly efficient products. The range of EMI RFI filters by Elcom International ensures a reduction in expenditure cost adhering to its energy efficient feature,  reduces injury risk from possible external sources, and prevents potential danger from severe power breakdowns.

Why are EMI filters necessary in electronic equipment? What are the best industry practices for installation of EMI EMC filter in your equipment

Firstly, we need to understand what is an EMI?

Electromagnetic interference (EMI) is unwanted noise or interference in an electrical or electronic device caused by various outside sources which can be occurring naturally or man-made.

The Electromagnetic Interference (EMI) can be classified into two types as: –

1. Conducted Electromagnetic Interference (Conducted EMI):

Conducted emissions are the noise components that are generated by a device or subcircuit and get transferred to another device or subcircuit through cabling, PCB traces, power/ground planes, or parasitic capacitance. The conducted emissions that appear on the interface and power cables must be kept low or they can enter through cables and reach to other devices, which can cause problems to other connected devices.

2. Radiated Electromagnetic Interference (Radiated EMI):

Radiated emissions are the noise components that the whole system generates as an electromagnetic field, so it can propagate through the air and reach other devices around it.

EMI can cause electronics to degrade or even malfunction the performance of electrical equipment. This is why we require EMI EMC Filters in Electronic equipment which improves the quality of a signal passing through the electronic devices and thus improves functionality of electrical equipment.

What is an EMI EMC Filter?

An EMI filter is a passive electronic device used to suppress conducted electromagnetic interference present on any power or signal line. It may be used to suppress the interference generated by the device itself, as well as to suppress the interference generated by other equipment to improve the immunity of a device to the EMI signals present within its electromagnetic environment. Most EMI filters are designed to suppress both common mode and differential mode interference. Filters can also be designed with added devices to provide transient voltage and surge protection

How do EMI filters work?

An EMI filter has a high reactive component to its impedance. So, EMI filters are low-pass filters that block high frequencies while they allow lower frequencies to pass through. After the filtering process, electromagnetic noise gets diverted away from the device and to the ground. Some EMI filters may also route unwanted currents back to the noise source or absorb them.

Because EMI filters only protect against conducted EMI, they are often paired with shields that block radiated EMI. Adding a shield at the attachment point of the electromagnetic interference filter can effectively block all forms of EMI.

To keep out radiated/electromagnetic waves, the filter must be paired with a shielding.

Various types of shielding methods are as follows:

1)      Putting a filter very close to the point of entry

2)      Using shielded input cables

3)      Using metal case filters

4)   Proper and firm grounding

Without these, EMI can radiate through the air, similar to radio waves, and cause interference even when a filter is installed.

EMI RFI Filters can be found in home appliances, medical equipment, laboratory equipment, radio equipment, automation products, computing devices, testing – measuring equipment and military equipment. 

The EMI EMC filters are made in a certain measure to make certain compliance of products with EMC requirements. Thus, they can work effectively if they are properly installed. Installation is important to filter performance because appropriate installation helps in minimising the propagation and susceptibility to interference. This helps in achieving compliance with standards and regulations. EMI filter installation best practices typically reduce overall costs of compliance by reducing repeated testing costs and optimizing the solution. The planning and implementation of other EMC measures and design rules also contribute to good performance in terms of noise emission.

Best Installation Practices

1. EMI Filter wiring and cable layout:
● Make sure filter output wires are not routed close to or near the input wires.
● Maintain physical isolation and separation between filter input and output wires.
● Make sure to keep power wiring separate from control wiring. Power and control wires must not run in parallel. Keep control wires away from the incoming power lines to the filter. If the input and output line is nearby, noise is generated at a high frequency, affected by electric induction.
An ideal isolation system is a bulkhead-mounted filter incorporating a line cord connector, such as the Elcom EB power line filter series. For the connection keep wires/cables at the filter input as short as possible and shield the input cables, if necessary.

2. EMI filter mounting:
The mounting and wiring of the filter are critical things which have influenced its performance. So, its purpose must not be defeated by stray capacitance coupling the power input leads to the power output leads, or to any other conductors in the protected equipment. So, mount the filter as close to the EMI source as possible and ensure that the filter input and output conductors leads are separated, whether it’s a drive, uninterruptible power source, inverter, or another component.

3. EMI filter Grounding:
Another important requirement is its connection to the ground. Use shielded wiring wherever possible and connect the system ground to the EMI filter. Proper grounding is very essential for the operation of the filter. Without correct grounding, the filter will lose the common-mode attenuation provided by Y-capacitors. Ensure filter housing is grounded to the host cabinet by metal-metal connection. All surfaces are to be conductive and void of paint or other insulating material. For non-metal housings, the filter should be grounded by the incoming safety wire. Take a ground wire as thick and short as possible and fix the grounding strongly. This will help to achieve a low impedance ground at high frequencies. Mount the filter directly to a bare metal grounded panel for best performance. Use shielded conductors to minimize radiated high-frequency noise levels.

EMI Filter Applications:
Here are some industrial and residential applications of EMI EMC Filters –

● Appliances and washing machines: White goods EMI filters suppress electromagnetic noise for a variety of home appliances from washing machines to treadmills. These filters ensure that devices meet electromagnetic compatibility regulations and help to protect them from EMI damage that can impact their performance.

■ Single-phase: Single-phase EMI filters are effective for smaller equipment, such as home appliances and electronics, as well as industrial applications, such as food service equipment, power supplies, and telecommunications. A single-phase EMI filter can also be compatible with fitness equipment and motor controls.

■ Three-phase: For more stringent EMI suppression, three-phase EMI filters can block higher levels of noise through a two and three-stage filtering system. Three-phase EMI filters are for use in high-power applications such as industrial machinery and motors, medical equipment, test equipment, and industrial tools.

● Military: EMI filters for military applications specifically meet regulations and compliance standards for EMC of military devices. These reliable EMI filters protect against damage to aerospace and military communication systems for secure operations.

● Medical-grade EMI filters: Medical-grade EMI filters are used for medical applications to protect sensitive medical equipment from damage. Medical grade EMI Filters are available with low leakage current. Effective and reliable EMI filters for medical applications can be life-saving protection against electromagnetic noise interference to the equipment.