Filter Inductors
Filter inductors are series chokes used to smooth current, attenuate ripple and harmonics, and shape switching waveforms in rectifiers, inverters, drives and power-conditioning equipment.
Overview
Filter inductors are series chokes used to smooth current, attenuate ripple and harmonics, and shape switching waveforms in rectifiers, inverters, drives and power-conditioning equipment. Depending on where they sit they act as DC-link/DC smoothing chokes (filtering rectifier output and absorbing DC-bus ripple and spikes), as LCL/harmonic-filter inductors paired with capacitors to attenuate switching frequencies, or as ripple-smoothing chokes in DC supplies. By presenting a rising impedance to higher-frequency components, they reduce harmonic distortion fed back to the supply, lower capacitor and semiconductor stress, and improve overall waveform quality. ACE manufactures these as dry-type, naturally-cooled inductors wound on low-loss laminated cores to a specified inductance and current rating, in single- or three-phase form. Buyers choose ACE for filter chokes tuned to their converter topology and harmonic-mitigation target rather than a generic part.
Specifications
| Rated inductance (mH) — set by ripple/harmonic-attenuation requirement | |
| Rated current (continuous RMS / DC) plus harmonic-loading capability | |
| Frequency | 50/60 Hz fundamental (and 400 Hz on request); attenuation across switching harmonics |
|---|---|
| Phases | single-phase (DC link / DC smoothing) or three-phase (AC filter) |
| Linearity / saturation behaviour at peak current | |
| Insulation class | up to Class H; low partial-discharge |
| Cooling | natural air (dry type); low watt-loss per kg |
| Mounting | floor / panel; Enclosure: open (IP00) or enclosed (IP rated) as specified |
| Voltage class | LV (e.g. 230 / 415 / 690 V) to specification |
| Applicable practice | IEC 60076-6 reactors, IEEE-519 harmonic limits, IS/IEC |
Applications
- DC-link / DC-bus smoothing chokes in VFDs and inverters
- Output / ripple filter inductors in rectifiers and DC power supplies
- LCL / harmonic-filter inductors in active and passive filters
- Sine-wave and dV/dt filter stages for drive outputs
- Power-conditioning, UPS and converter systems
Frequently asked questions
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- Primary & secondary voltage
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- Phase (1-ph / 3-ph)
- Cooling, mounting & enclosure (IP)
- Application / end-use
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