Line Air Chokes to DC Link

Name: Line Air Chokes to DC Link | DC link inductors | Bus Link Inductors - Frigate
Price: 249.00 USD
Availability: InStock

Fast-switching power converters generate differential-mode harmonics in the 2–20 kHz range, which distort power quality and stress downstream components. Line air chokes introduce impedance at these frequencies, effectively attenuating harmonic currents before they propagate into the DC bus. This ensures stability and supports compliance with harmonic distortion standards such as IEEE 519.

Rated System Voltage

400 V / 415 V / 480 V / 690 V AC

Tuning Frequency

189 Hz / 210 Hz for 50 Hz systems

Inductance Tolerance

±5% (measured at rated current and 50 Hz)

Core Material

CRGO silicon steel / Amorphous metal

Insulation Class

Class H (180°C thermal endurance)

Product Description

Pulsed input currents cause voltage ripple across DC link capacitors, leading to increased ESR losses and capacitor wear. Line air chokes offer inductive smoothing that limits ripple amplitude and controls dI/dt stress. The result is extended capacitor life and improved voltage stability across the DC bus.

Maximum Hot Spot Temperature

155°C continuous with 180°C short-duration withstand

Rated Harmonic Current

Up to 150% of fundamental current

Total Inductor Losses

≤ 3 W per reactive kVAR at rated harmonic profile

Dielectric Withstand Voltage

3 kV AC for 1 minute between windings and core

Magnetic Flux Density (Bmax)

≤ 1.6 Tesla at rated load, below saturation threshold

Short Circuit Thermal Withstand

1.8 x Irms for 1 second (IEC 60076-6 compliance)

Detuning Reactance (Uk%)

Typically 6%, 7%, or 14% depending on required detuning frequency

Winding Configuration

Copper/Aluminum, foil or round wire, thermally balanced with insulation barriers

Mounting Configuration

Base-mounted with vibration-damped brackets and slotted holes for alignment

Acoustic Noise Level

≤ 65 dB at 1 meter under rated harmonic loading

Technical Advantages

Common-mode noise from fast-switching devices induces leakage currents and EMI issues. Balanced winding line chokes present high impedance to common-mode signals while maintaining differential-mode performance. This supports compliance with EMC regulations and reduces ground loop interference.

Load transients can generate voltage spikes that compromise insulation and damage components. Line air chokes limit the voltage rise rate by introducing controlled inductance, absorbing transient energy, and reducing overvoltage risk to semiconductors and DC bus capacitors.

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Industry Applications

Industrial Motor Drives

Suppresses inverter-generated harmonics and limits voltage ripple at the DC link in variable frequency drive (VFD) systems.

Renewable Energy Inverters

Provides filtering between rectifier and DC bus, reducing switching noise and protecting DC link capacitors in solar or wind inverters.

Electric Vehicle Chargers

Minimizes EMI and ripple currents during AC-DC conversion, ensuring DC bus voltage stability in onboard and offboard EV chargers.

HVAC Systems with VFDs

Controls dI/dt and harmonic injection into the DC link, improving performance of fan, compressor, and pump drive systems.

CNC and Robotics Equipment

Limits high-frequency noise and transient overshoots across shared DC buses in servo drive and multi-axis motion control systems.

Battery Energy Storage Systems (BESS)

Reduces ripple and transients during charge/discharge cycles, protecting DC bus components in grid-tied and standalone battery systems.

Improved Converter Efficiency Under Partial Load Conditions

Converters under partial load often operate inefficiently due to unstable current profiles and excess switching. Line air chokes stabilize current flow and reduce switching spikes, improving system efficiency and minimizing losses across a wide load range.

Stable choke performance depends on core material behavior under high frequency and elevated temperatures. Using nanocrystalline or gapped ferrite cores ensures low core loss, minimal inductance drift, and thermal reliability. Class H insulation and vacuum-impregnated windings further support durability in high-stress environments.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure stable inductance in Line Air Chokes under high load current conditions?

Frigate designs chokes using optimized air gap distribution and low-saturation core materials. This prevents inductance drop even under peak current. All designs are validated using non-linear FEA simulations. Stable inductance ensures ripple filtering performance remains consistent across the load cycle.

What testing does Frigate perform to qualify chokes for high-frequency switching environments?

Frigate conducts high-frequency impedance scans up to 500 kHz to characterize attenuation performance. Each choke is tested for core losses, leakage inductance, and thermal behavior under real switching profiles. Thermal imaging and impulse testing confirm high-frequency noise suppression. These tests ensure compatibility with modern SiC or GaN-based converters.

How does Frigate address thermal management in compact Line Air Choke assemblies?

Frigate uses thermally stable insulation systems rated up to Class H (180°C). Core materials are selected for low hysteresis and eddy current losses. All units are vacuum impregnated to improve heat dissipation and mechanical integrity. This allows operation in high ambient temperatures without derating.

Can Frigate design Line Air Chokes for multi-pulse rectifier applications with high harmonic content?

Yes. Frigate evaluates harmonic current spectra and selects core geometry to maintain impedance at critical harmonic frequencies. Design includes proper wire gauge and cooling to handle harmonic RMS current. The result is a choke optimized for 6-pulse, 12-pulse, or 18-pulse front-end systems.

How does Frigate ensure mechanical reliability under high inrush or fault conditions?

Chokes are mechanically braced to handle magnetic forces during short circuits or inrush events. Frigate uses FEA to simulate stress on winding and core interface. Vacuum impregnation prevents coil movement and insulation wear. This ensures long-term performance even under extreme transient loads.

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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Components Built for Critical Performance

Engineered Products for Critical Applications

Line Air Chokes to DC Link

Rated System Voltage

Tuning Frequency

Inductance Tolerance

Core Material

Insulation Class

Product Description

Maximum Hot Spot Temperature

Rated Harmonic Current

Total Inductor Losses

Dielectric Withstand Voltage

Magnetic Flux Density (Bmax)

Short Circuit Thermal Withstand

Detuning Reactance (Uk%)

Winding Configuration

Mounting Configuration

Acoustic Noise Level

Technical Advantages

Let's Get Started

Industry Applications

Improved Converter Efficiency Under Partial Load Conditions

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Having Doubts? Our FAQ

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LOCATIONS

Registered Office

Operations Office

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

Operations Office

Other Locations

GENERAL ENQUIRIES

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Line Air Chokes to DC Link

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Line Air Chokes to DC Link

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