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We offer a comprehensive portfolio including resistors, braking units, reactors, power filters, and transformers, with full customization options to meet diverse application requirements.
Dufew Electric Single-Phase Filter is designed to suppress conducted electromagnetic interference generated by power electronic equipment during high-frequency switching operation.
Installed between the AC power supply and equipment input terminals (L/N), the filter uses inductors, capacitors, and damping components to form an optimized LC filtering network. The circuit provides high impedance to unwanted high-frequency interference signals while allowing normal 50Hz/60Hz power transmission.
During operation of single-phase VFD systems, servo drives, and switching power supplies, high-frequency switching noise may propagate through power cables and affect nearby electronic equipment.
The filter effectively reduces:
- Differential-mode interference between power lines
- Common-mode interference between power lines and ground
- Conducted electromagnetic noise transmission
- EMC-related equipment malfunction risks
Through optimized circuit design and component matching, Dufew Single-Phase Filter provides stable attenuation performance, controlled leakage current, and reliable operation in industrial environments.
The filter integrates inductors, capacitors, and damping components to create a frequency-selective impedance network.
The design provides:
- High-frequency interference attenuation
- Improved noise isolation
- Stable power transmission
- Enhanced EMC compliance performance
Electrical interference generated by switching devices usually occurs through two transmission paths.
Occurs between power lines and is mainly caused by switching circuits and power conversion components.
Occurs between power lines and ground and may affect sensitive control systems, communication devices, and precision instruments.
Dufew optimizes the filtering circuit to suppress both interference modes and improve overall system stability.
The filter helps reduce interference transmission between electronic equipment and the power supply network, supporting lower conducted emissions, improved EMC performance, reduced disturbance to nearby equipment, and more stable system operation.
The single-phase structure is designed for compact electrical installations, with a small installation footprint, simple L/N wiring, and flexible cabinet integration. Its practical configuration also facilitates replacement and routine maintenance.
Dufew applies controlled manufacturing processes to support stable operation in industrial automation environments. Key considerations include magnetic component selection, insulation structure, electrical parameter verification, and thermal performance evaluation for continuous operating conditions.
Dufew Single-Phase Filter is suitable for electronic equipment requiring improved EMC performance and reduced power line interference.
| Application | Main Function |
|---|---|
| Single-phase VFD systems | Reduce conducted interference |
| Servo drives | Improve EMC stability |
| Switching power supplies | Suppress power line noise |
| UPS systems | Improve electrical compatibility |
| Industrial controllers | Protect sensitive circuits |
| Precision instruments | Reduce electromagnetic disturbance |
Typical applications cover industrial automation and manufacturing equipment, as well as medical electronics, laboratory systems, electronic production lines, and communication equipment where stable power quality and effective EMI control are required.
Different applications require different filtering characteristics. Dufew Electric provides customized solutions based on rated voltage, rated current, equipment power characteristics, EMC requirements, installation space, and environmental conditions.
Engineering support covers product selection, parameter matching, and application evaluation to help determine a suitable filter configuration for the intended equipment and operating conditions.
Dufew Electric specializes in industrial power electronics components, including EMI filters, harmonic filters, reactors, braking resistors, and customized electrical solutions. For Single-Phase Filter production, key processes include magnetic component manufacturing, precision assembly, electrical parameter testing, insulation performance verification, and thermal reliability evaluation.
Key quality checks may include:
- Insulation resistance testing
- Dielectric withstand testing
- Electrical performance verification
- Final appearance inspection
Dufew Electric supports OEM manufacturing, custom filter solutions, technical application support, and industrial project cooperation according to customer requirements.
| Parameter | Specification |
|---|---|
| Rated Voltage | 220VAC |
| Operating Frequency | 50Hz / 60Hz |
| Rated Current | Customized according to requirements |
| Filter Type | EMI LC Filter |
| Dielectric Strength (Line-to-line) | 1500VDC / 60S |
| Dielectric Strength (Line-to-ground) | 2250VDC / 60S |
| Insulation Resistance | ≥100MΩ |
| Protection Grade | IP00 / IP20 |
| Operating Temperature | -25℃ to +85℃ |
| Compliance | RoHS |
| Comparison | Single-Phase Filter | Three-Phase Filter |
|---|---|---|
| Application | 220V single-phase equipment | Three-phase industrial systems |
| Circuit Structure | L/N line filtering design | Three-phase line filtering design |
| Installation | Compact control cabinet integration | Larger industrial installation |
| Wiring | Two-line connection | Three-phase connection |
| Typical Use | Electronic equipment and small automation systems | Industrial power equipment |
A Single-Phase Filter is commonly used for single-phase VFD systems, servo drives, switching power supplies, UPS systems, industrial controllers, and other electronic equipment requiring EMI suppression.
The filter should be installed at the AC power input side between the power supply and equipment terminals. Correct installation helps prevent interference generated by equipment from returning to the power grid.
No. Input-side EMI filters are designed for power line interference suppression. VFD output applications require dedicated output filters, sine wave filters, or dv/dt filters.
Selection should consider rated voltage, operating current, equipment type, EMC requirements, installation environment, and cabinet space. Dufew provides customized recommendations based on actual application conditions.
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No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
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