Shenzhen CHITEK New Energy Technology Co., Ltd., founded in 2019 and headquartered in Shenzhen, is a high-tech enterprise specializing in the research, development, manufacturing, and service of power electronic products. Committed to building an energy-efficient and green future.
Silicon Carbide MOSFET Static Var Generator SiC (50-200A) 
Ultra-slim Static Var Generator (8-20A) 
IP65 SiC-Fanless Static Var Generator 25A 
Active Harmonic Filter (AHF) Series
Every CHITEK AHF compensates harmonics from the 2nd through the 50th order, and you decide how much of each individual order gets corrected. The compensation current tracks whatever the network is producing at that moment instead of running to a fixed curve — cleaner power, less wasted energy.
No two loads distort the waveform the same way, and a single load keeps changing its harmonic signature as operating conditions shift. The filter reads those changes continuously and adapts its output to follow them.
Benefits of Active Harmonic Filter (AHF)
- Save on energy costs
- Boost overall productivity
- Fast payback on your investment
- Electrical and process equipment keeps running longer
- Reliable operation with lower maintenance spend
- Extra usable capacity from your existing power grid
Application of Active Harmonic Filter (AHF)
Industry
Semiconductor, pulp & paper, pharmaceuticals, food & beverages, automotive, metal processing
Commercial buildings
Data centers, hospitals, airports, logistic centers, shopping malls
Infrastructure and utilities
Water treatment, wastewater purification, irrigation systems, desalination
Anyone with VFDs
Wherever VFDs are used, our active filter helps optimize performance and power quality
Petroleum
Harmonic source: thyristor, inverter
Harmonic equipment: speed fans, all kinds of pumps
Garbage Power Generation
Harmonic source: rectifier, inverter
Harmonic equipment: all kinds of pumps
Semiconductor
Harmonic source: thyristor, single crystal furnace
Harmonic equipment: quartz crucible, thyristor
Iron & Steel Smelting
Harmonic source: rectifier, inverter, thyristor
Harmonic equipment: blast furnace, converter, intermediate frequency furnace, electric arc furnace, transmission system
Data Center
Harmonic source: UPS, rectifier
Harmonic equipment: switching power supply, UPS, variable-frequency air conditioning, elevators, energy-saving lamps
Sewage Treatment
Harmonic source: inverter, rectifier
Harmonic equipment: fans, pumps (condensate pump, circulating pump, feed pump, injection pump)
Hospital
Harmonic source: rectifier, UPS, inverter
Harmonic equipment: precision electronic medical equipment, energy-saving lamps, elevators, escalators, UPS
Drilling Platform
Harmonic source: rectifier, inverter
Harmonic equipment: AC generator set (DC power supplied via thyristor rectifier), derrick, winch, top drive, turntable, mud pump
EV Charging Station
Harmonic source: rectifier
Harmonic equipment: chargers
Automobile Manufacturing
Harmonic source: inverter, rectifier
Harmonic equipment: automatic welding machines, conveyor systems, CO2 welding, punching machines
Paper Industry
Harmonic source: halogen lamps, inverters
Harmonic equipment: pulper, frequency-conversion air conditioning, paper cutting machines, halogen lamps, overpressure machine, CNC machine tools, arc lamps
Modern Architecture
Harmonic source: rectifier, inverter
Harmonic equipment: switching power supply, variable-frequency air conditioning, elevators, energy-saving lamps, thyristor dimming systems, large LED equipment
Working Principle of Active Harmonic Filter (AHF)
Inside every CHITEK AHF, an external CT keeps sampling the load current while the DSP at the core runs an advanced control algorithm. It tracks the demanded current as it shifts, splits the measured load current into active and reactive components with an intelligent FFT, and derives the harmonic content quickly and precisely.
The DSP then feeds a PWM signal to the internal IGBT driver board, switching the IGBTs at 20 kHz. The inverter stage outputs a compensation current in opposite phase to the harmonics — and as it does, the CT reads the output current too and returns it to the DSP as negative feedback. That closed loop drives the next control cycle, which is what keeps the correction accurate and the system stable.
FAQs About the Active Harmonic Filter (AHF) Series
Q1: How do the models in the AHF range differ?
The range varies on two axes — switching technology (IGBT or SiC MOSFET) and mechanical format (ultra-slim wall mount, distributed, anti-pollution, IP65 outdoor and fanless low-noise). Every model applies the same real-time compensation principle; they differ in switching efficiency, footprint, enclosure rating and acoustic noise.
Q2: Which harmonic orders does the AHF series correct?
Every model in the range compensates harmonic orders from the 2nd through the 50th, and you choose how much of each individual order is corrected. Instead of running to a fixed curve, the compensation current tracks whatever the network is producing at that moment.
Q3: Can AHF modules be combined to reach a higher capacity?
Yes. The range is modular — modules parallel without a practical limit, so the same platform covers a single wall-mounted unit and installations reaching 3000 A and beyond.
Q4: Can AHF be installed outdoors or in harsh environments?
Yes. Alongside IP20 and IP30/IP40 enclosures for indoor switchrooms, the range includes IP65 models for outdoor and dusty sites, plus anti-pollution and fanless low-noise versions where dust, corrosion or acoustic noise is the constraint.