Your Best OEM EMI FILTER from China Manufacturer
Custom EMI filters for power supply, PCB and electronic systems. OEM manufacturer in China offering high-performance noise suppression
Fast sampling and PCBA integration. Get your solution today.
- Delivers excellent EMI shielding and full EMC compliance for industrial applications
- Features low insertion loss, stable circuit operation and low heat output
- Adopts compact design for easy embedded mounting and seamless system integration
- Provides powerful anti-interference performance to effectively eliminate high-frequency noise
- Made of premium durable materials, ensuring long lifespan for bulk industrial use
- Customized specifications and tailored solutions are available upon request
- ISO-certified factory with complete CE, FCC, RoHS, IATF16949 authoritative certifications
EMI FILTER Series
Classified by power supply system, there are AC EMI filters and DC EMI filters.
AC EMI Filters:
- Single-phase (1Φ): 220/250 VAC, applied in household appliances, industrial control, medical equipment and IT devices.
- Three-phase (3Φ): 380/480/690 VAC, suitable for inverters, motors, photovoltaic inverters and high-power industrial equipment.
- Three-phase four-wire (3Φ+N): With neutral wire, widely used in data centers, high-power UPS and precision industrial facilities.
- Three-phase three-wire (3Φ, no neutral wire): For industrial power systems and motor drives.
DC EMI Filters:
- Low-voltage DC: 12/24/48 VDC, for communication base stations, servers and vehicle-mounted systems.
- High-voltage DC: 150/300/600/1500 VDC, applied in photovoltaics, energy storage, new energy vehicles and charging piles.
- Features: Suppress high-frequency ripples and common-mode interference on the DC side.
Classified by Circuit Topology (Internal Structure):
- L-type (single-stage): 1 inductor + 1 capacitor, low cost with basic noise suppression performance.
- Pi-type (π-type): 1 inductor + 2 capacitors, the most universal type with excellent high and low impedance adaptability.
- T-type: 2 inductors + 1 capacitor, ideal for low-impedance loads with low ringing tendency.
- C-type: Three-terminal feedthrough capacitor, outstanding high-frequency performance and compact size.
- Dual-stage / Multi-stage: Combined dual Pi/L structure, high attenuation (＞60dB), adopted in medical, military and high-end equipment.
- Dedicated common-mode / differential-mode filters: Combined common-mode inductors with X/Y capacitors to suppress common-mode and differential-mode noise respectively.
Classified by Mounting Form: Power Line EMI Filters and Signal Line EMI Filters
Power Line EMI Filters:
- Chassis inlet type: Independent module, installed by screws or fasteners.
- PCB onboard type (SMD / through-hole): Miniaturized design, directly soldered onto the mainboard.
- Feed-through type: Adopting feedthrough capacitor structure, specially designed for shielding enclosures with superior isolation.
- Filter connectors: Plugs and sockets with integrated filtering functions (e.g., DB9, RJ45, power terminal blocks).
Signal Line EMI Filters
- Data lines: USB, HDMI, CAN, RS485, Ethernet and other communication interfaces.
- Low-frequency signals: Sensors, analog signals, audio signals, etc.
- High-frequency / RF signals: Radio frequency ports, antenna feeders and other RF applications.
Why Choose ZEH'S EMI FILTER For Your Flexible Design?
ZEH’S custom EMI filters feature compact size, strong shielding and full EMC compliance. Flexible for diverse designs, factory direct supply helps you cut costs and boost product stability.
The EMI FILTER Applications
Such as air conditioners, refrigerators, washing machines, microwave ovens, TVs, PC power supplies, chargers, coffee machines, blenders, power tools and so on.It reduces power grid pollution caused by motors and switching power supplies, and prevents noise, system crashes, as well as interference with radio and TV signals.
Such as onboard chargers (OBC), DC-DC converters, new energy vehicle BMS and electronic control systems, as well as high-speed railway and subway traction systems and signal equipment. It meets automotive EMC standards and prevents high-voltage systems from interfering with low-voltage electronic devices.
Such as monitors, B-ultrasound, CT, MRI, surgical equipment, inspection and analytical instruments, and various medical power supplies.It ensures high-precision measurement of medical devices, avoids interference that affects diagnosis, and fully meets medical safety regulations and EMC standards.
Such as server power supplies, switches, routers, base station equipment, communication power supplies and data center power distribution systems.It purifies power quality, reduces common-mode and differential-mode interference, and guarantees stable network operation without disconnection.
Such as inverters, servo drives, PLCs, industrial power supplies, switching power supplies, CNC machine tools, textile machinery, packaging equipment, motor drive systems and robot control systems. It suppresses high-frequency interference generated by motor start-stop and frequency conversion switching, preventing malfunction and communication interruption.
Such as photovoltaic inverters, wind converters, UPS, EPS, charging piles, energy storage PCS, high and low-voltage distribution cabinets and power meters. It filters grid harmonics, reduces radiated interference and meets grid-connected EMC requirements.
Such as surveillance cameras, NVR recorders, printers, copiers, projectors, fire alarm systems, building automation systems and more.It effectively improves signal stability and avoids image ripples, data transmission errors and other abnormal issues.
Strengths of our company
It is equipped with standardized production lines, as well as stringent procedures for incoming material inspection, in-process testing and full finished product inspection. Every link is strictly controlled, from component selection to finished product aging testing, ensuring consistent performance, high reliability and long-term operational stability of each EMI filter.
We can customize common-mode and differential-mode parameters, structural dimensions, terminal and wiring methods according to the interference characteristics of different equipment such as inverters, servos, power supplies, new energy devices, medical equipment and industrial control systems, to quickly meet customers’ overall EMC requirements for complete machines.
Relying on large-scale production and supply chain advantages, we optimize costs while ensuring safety compliance and EMC performance. We deliver with stable lead times, support small-batch sampling and mass continuous supply, and meet the demands of overseas export and domestic brand customers.
Products are designed in accordance with international standards to meet relevant safety and EMC requirements including CE, FCC, UL and CCC. This enables customers’ equipment to obtain certification efficiently and effectively reduce risks in product launching and export business.
Optimized circuit topologies are developed for complex electromagnetic environments in industrial sites, which effectively suppress power grid harmonics and high-frequency noise, enhance equipment anti-interference capability, and reduce malfunctions such as system crash, false operation and communication failures.
The product features a compact and rational structural design, supporting multiple mounting methods such as DIN rail, terminal connection and lead wire types. With a small footprint, it enables flexible layout inside power supplies, control cabinets and various equipment.
