1) 

PFC chokes are made from the iron powder core with either one or two coils. As small magnetic leakage, a low wastage and Low profile, high power factor correction, they are widely applied in electronic ballast or other switch power supply. 
Active PFC offers better THD and is significantly smaller and lighter than a passive PFC circuit. To reduce the size and cost of passive filter elements, an active PFC operates at a higher switching frequency than the 50Hz/60Hz line frequency. 
Active PFC functions include: 
-Active wave shaping of the input current 
-Filtering of the high frequency switching 
-Feedback sensing of the source current for waveform control 
-Feedback control to regulate output voltage 
Buck, boost, flyback and other converter topologies are used in active PFC circuits. 

2) 

Key Specifications/Special Features: 
-Selection of materials: Amorphous magnetic, Nan crystalline ring, Kool toroid 
-High current, horizontal or vertical mount 
-High saturation flux density 
-High power factor correction 
-Low profile and low weight 
-Less flux leakage and beat 
-Low radiation and core loss 
-Precise inductance 
-Operating temperature: -55 to 105° C 
-Power: 200, 250, 300 and 500W 
-100V/230 50Hz 
-Inductance Range: 1 to 1000 uH 
-PF value: Greater than 98% 
-Tested at 100 kHz, 0.1Vrms inductance of uH 10% 
-DC current at which the inductance drops 10% (type) from its value without current 
-Electrical characteristics at 25 degrees Celsius 
-Insulation: Class B (130° C), Class F (155° C), Class H (180° C), Class N (200° C) and Class R (220° C) 
-Certifications: UL, CQC and CE 
-Excellent utilization of electricity, good for environmental protection 
-Customized specifications are accepted

3) 

Applications: 
-Frequency Power 
-UPS 
-EMI/RFI filters 
-Switching power output and smoothing circuits 
-Used as choke coil for high frequency SMPs 
-Countermeasure against spike ripples 
-DC/DC converters 
-IP and OP devices 
-Notebook computer 
-Air conditioning 
-Digital TV 
-Battery power equipment 
-Power supply of all types of household appliances 
-Switching power supplies 

4) 

Reasons of our top-quality components help your business succeed: 
-35 years of experience customizing and power inductors 
- Experienced staff keeps good quality 
-Your professional and reliable partner for various electronics 
- Over 1000 buyers value our products 

   over 8 million units annual capacity 
- Our Products has the UL Insulation System, Quality is guaranteed 
- Good Product Performance, high quality and best services 
- More models and types are available. Welcome your spec and sample to make custom-manufacturing. 

Standard hard cartons on pallets for toroidal chokes, show below

We make packing mould based on each single product'ssize and shape to be sure they will fit perfectly in the carton and then we will put cartons onto a plastic pallet to be sure the transformers will be protected fully against the rough and long ocean shipment.

1) We supply our customers free samples and generally toroidal chokes's samples can be finished within one week. But our customers will be required to pay for the samples shipping charge to customer's destination

2) We give our customers 2-year product warranty to better protect our customers' interests

3) 24 hours english hotline, 86-13207512928, for any product inquiry, after sales service or technical issues.

4) OEM and ODM are welcome

5) Factory visiting are warmly welcome

1) ISO9008:2001 implemented, we also apply 5S and6sigma into our production and quality control process

2) We have over 35 years of transformer designing and producing experiences. We started to supply transformers, inductors etc to domestic TV manufacturer and then we shifted our focus onto international markets. Now we export over90% of our products worldwide

3) Product capacity: we can produce 5-8million pieces transformer each year. We have around 300workers in our two factory locations.

4) Our quality control

First, we will do supplier auditions to choose qualified suppliers to start business with

Second, we only buy incoming material from the suppliers we have already audited

Third, we test all the incoming material

Fourth, We will make 5-10pieces samples out of the checked incoming materials before we start the mass production

Fifth, We do tests during production process, a few times 100% test

Sixth, we will do 100% of finished products

Seventh, test reports made by our QC department

Please check below chart as an example: