Wholesale Filter from China Factory

Dufew Electric is a China Passive Filter Manufacturer and Supplier offering filter configurations based on system voltage, harmonic conditions, load characteristics, and application requirements.

Dufew Electric Derivative Voltage Filter (dv/dt Filter) is designed to protect motors driven by VFD systems, inverter drives, and industrial automation equipment from high-frequency PWM switching stress. Installed between the inverter output and motor terminals, it reduces voltage rise rate (dv/dt), limits transient voltage spikes, and helps minimize reflected voltage, common-mode interference, and motor insulation stress. With rated voltage from 220VAC to 1140VAC and rated current from 5A to 1600A, Dufew provides customized motor protection solutions for demanding industrial drive applications.

Dufew Electric Sine Wave Filter is a professional VFD output filter manufacturer and supplier for industrial motor systems. Installed between the VFD and motor, it uses an LC low-pass filtering circuit to reduce PWM switching components, high-frequency harmonics, and dv/dt stress. Dufew provides customized solutions based on voltage, current, cable length, and application requirements.

Dufew Electric Harmonic Filter is a customized power quality solution designed for VFD systems and nonlinear industrial loads affected by harmonic distortion. Installed at the VFD input side, it uses a tuned LC resonant circuit consisting of reactors, capacitors, and damping resistors to reduce characteristic harmonic currents such as the 5th, 7th, 11th, and 13th orders. As a professional harmonic mitigation solution provider, Dufew helps industrial customers improve power quality, reduce electrical stress, and maintain stable operation of power conversion systems.

Protect your motors with the Dufew Industrial Output Filter. Designed for VFD and servo drive systems, this motor-side solution attenuates dv/dt voltage spikes, PWM noise, and harmonics in long-distance cable applications. Dufew delivers low-leakage, fully customizable power quality filters for heavy-duty industrial compliance.

Dufew Electric Input Filter is designed for VFDs, servo drives, and industrial power systems to improve EMC performance. Installed at the power input side, it reduces conducted interference, suppresses common-mode and differential-mode noise, and protects electrical components from power disturbances. With a three-stage filtering structure, low leakage current design, and customizable specifications, Dufew provides reliable VFD Input Filter solutions for industrial automation and precision applications.