Filter Chokes

Nonlinear loads generate harmonic currents that distort voltage and increase thermal stress on conductors. Filter chokes are tuned for high impedance at dominant harmonic frequencies (5th, 7th, 11th), using low-loss laminated cores and tightly controlled inductance. This ensures network compliance with IEEE 519 and improves upstream transformer life. 

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

High-frequency switching causes EMI that interferes with control systems and communication lines. Filter chokes introduce differential and common-mode impedance to block frequencies from 150 kHz to 30 MHz. Core materials and winding layouts are optimized for low parasitic capacitance and stable high-frequency performance. 

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

Rapid load changes can cause current spikes that saturate the core, leading to non-linear inductance and overheating. Filter chokes are engineered with calculated air gaps and low flux density operation to maintain inductance stability. Saturation-resistant materials support thermal limits up to Class H. 

Improper tuning of filter networks leads to harmonic amplification due to resonance. Filter chokes are designed with precise inductance and damping factors to shift resonance points safely away from dominant harmonics. Impedance is modeled to prevent adverse interaction with capacitive elements or grid impedance. 

 

Let's Get Started

Need reliable Chokes for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Industry Applications

Solar Inverter Systems

Filters high-frequency switching noise and limits grid-injected harmonics in photovoltaic inverter output for grid code compliance. 

UPS (Uninterruptible Power Supply) Systems

Minimizes switching ripple and EMI at the output stage to ensure clean sinusoidal power delivery during backup operations. 

Wind Turbine Converters

Controls electromagnetic interference and reduces torque ripple by filtering converter output before generator or grid-side connection. 

Industrial Automation Panels

Suppresses conducted noise and harmonic currents from servo drives and power supplies to avoid interference with control circuitry. 

HVAC Motor Control Units

Smoothens pulse-width modulated voltage output to reduce motor heating and mitigate acoustic noise in fan and compressor drives. 

EV Charging Infrastructure

Filters switching transients and harmonics from DC fast chargers, ensuring EMC compliance and protecting grid-connected equipment. 

Filter Chokes

Compact Design for Integration in Enclosed Assemblies

Space-constrained enclosures require inductors with minimal footprint and effective thermal handling. Filter chokes are built using high-permeability materials and efficient winding geometry to reduce size. FEA-based thermal design ensures uniform heat dissipation in natural or forced-air environments. 

Mismatched inductance can lead to excessive voltage drop or ineffective filtering. Filter chokes are engineered based on drive switching frequency, load profile, and harmonic impedance modeling. Configurations include tapped inductance, thermal sensors, and dual-core balancing for three-phase systems. 

Filter Chokes

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate control core saturation in high-current filter chokes?

Frigate uses low-flux-density designs with air-gapped cores to prevent early saturation under dynamic load conditions. The cores are selected for high saturation flux density and low hysteresis loss. Each choke is thermally derated to match continuous operation at full rated current. Design validation includes B-H curve analysis and saturation threshold testing. 

What techniques does Frigate use to reduce high-frequency EMI in compact filter chokes?

Frigate applies precision winding layouts to minimize inter-winding capacitance and maximize differential-mode attenuation. High-permeability ferrites or nanocrystalline cores are chosen based on EMI frequency range and thermal constraints. Custom bobbin designs and shielding can be integrated when additional common-mode suppression is needed. Chokes are tested per CISPR standards for radiated and conducted emissions. 

How does Frigate ensure inductance stability over temperature and load?

Frigate designs its chokes using materials with stable magnetic permeability over a wide temperature range. Inductance is maintained within ±5% from -25°C to 125°C, verified through thermal cycling tests. Core losses and copper losses are separately modeled using FEA tools. This ensures reliable performance in both steady-state and transient conditions. 

What measures does Frigate take to prevent resonance in filter choke applications?

Frigate calculates choke inductance and Q-factor based on the entire filter network, including upstream and downstream impedances. This prevents resonance peaks that could amplify specific harmonics. For LCL filters, damping resistors or split inductance designs are used to suppress oscillations. Tuning is verified through harmonic impedance simulation and frequency response testing. 

How does Frigate address space constraints in enclosed industrial systems?

Frigate uses compact magnetic core shapes like toroidal and C-core to reduce physical size while maintaining required inductance. High-saturation flux materials allow reduced core cross-section without sacrificing performance. Chokes are thermally optimized using airflow modeling for natural and forced convection. Mounting options include vertical, horizontal, and baseplate-fixed types for space-efficient integration. 

 

Get Clarity with Our Manufacturing Insights

We'd love to Manufacture for you!

Submit the form below and our representative will be in touch shortly.

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

Get Quote
Support All File Formats Including - STEP | STP | SLDPRT | STL | DXF | IPT | X_T | X_B | 3DXML | CATPART | PRT | SAT | 3MF | JT files

Filter Chokes

Need reliable wires and cables for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

Get Price Form

Filter Chokes

Need reliable Machining for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

Get Price Form