TDK Network Card EE320x250x20 User Manual

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Large Size Ferrite Cores for High Power  
Summary  
Nowadays, more and more high-frequency circuits are being used in industrial equipment as well as consumer equipment. With the use of  
higher frequencies, silicon steel sheets have become unsuitable for magnetic material used in transformers. Ferrite, its substitute, delivers  
reduced core loss at high frequencies and is the optimum material for high-power requirements.  
To meet these various demands, we at TDK have employed our ferrite development technologies accumulated over the years and  
advanced production technologies to offer large, high-quality cores for high-frequency, high-power power supplies.  
In the following information, introduce ferrite cores that used PE22 and PC40 materials having superior magnetic characteristics.  
APPLICATIONS  
High frequency inductive heater  
EE320x250x20  
EC70,90,120  
PQ78,107  
Uninterruptible Power Supply System(UPS)  
CATV’s power supply  
Photovoltaic power generation  
Power supply of communications station  
Electrical vehicle  
Transformer  
Automated warehouse, conveyor machine  
Current sensor  
General purpose inverter  
• Air conditioner  
• Fun  
• Pump  
• Printing press  
• Packing machine  
• Machines for food industry  
• Drier  
UU79x129x31  
• Compressor of freezer  
Textile machine  
• Woodworking machine  
• Medical machine  
Reactor choke  
Trains  
UU79x129x31  
• All specifications are subject to change without notice.  
 
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CORE LOSS vs. FREQUENCY CHARACTERISTICS  
MATERIAL:PE22  
105  
104  
103  
102  
101  
105  
104  
103  
102  
101  
Material : PE22  
Temp.40˚C  
Material : PE22  
Temp.23˚C  
101  
102  
103  
104  
101  
102  
103  
104  
Frequency (kHz)  
Frequency (kHz)  
105  
104  
103  
102  
101  
105  
104  
103  
102  
101  
Material : PE22  
Temp.80˚C  
Material : PE22  
Temp.60˚C  
101  
102  
103  
104  
101  
102  
103  
104  
Frequency (kHz)  
Frequency (kHz)  
105  
104  
103  
102  
101  
105  
104  
103  
102  
101  
Material : PE22  
Temp.120˚C  
Material : PE22  
Temp.100˚C  
101  
102  
103  
104  
101  
102  
103  
104  
Frequency (kHz)  
Frequency (kHz)  
• All specifications are subject to change without notice.  
 
002-01 / 20071116 / e16_1.
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MATERIAL:PC40  
105  
104  
103  
102  
101  
105  
104  
103  
102  
101  
Material : PC40  
Temp.40˚C  
Material : PC40  
Temp.23˚C  
101  
102  
103  
104  
101  
102  
103  
104  
Frequency (kHz)  
Frequency (kHz)  
105  
104  
103  
102  
101  
105  
104  
103  
102  
101  
Material : PC40  
Temp.80˚C  
Material : PC40  
Temp.60˚C  
101  
102  
103  
104  
101  
102  
103  
104  
Frequency (kHz)  
Frequency (kHz)  
105  
104  
103  
102  
101  
105  
104  
103  
102  
101  
Material : PC40  
Temp.120˚C  
Material : PC40  
Temp.100˚C  
101  
102  
103  
104  
101  
102  
103  
104  
Frequency (kHz)  
Frequency (kHz)  
• All specifications are subject to change without notice.  
 
002-01 / 20071116 / e16_1.
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SATURATION MAGNETIC FLUX  
DENSITY vs. TEMPERATURE  
CHARACTERISTICS  
AMPLITUDE PERMEABILITY vs.  
SATURATION MAGNETIC FLUX  
DENSITY CHARACTERISTICS  
MAGNETIC PERMEABILITY vs.  
FREQUENCY CHARACTERISTICS  
5000  
700  
3000  
Material: PE22  
Temp.: 23˚C  
600  
500  
4000  
PE22  
2000  
120˚C  
100˚C  
80˚C  
PC40  
400  
µ′  
300  
200  
100  
0
60˚C  
µ′′  
3000  
40˚C  
1000  
23˚C  
Material: PE22  
f=16kHz  
200 300  
0
50  
100  
150  
2000  
0
101  
(
)
Temperature ˚C  
102  
103  
104  
0
100  
Flux density mT  
(
)
(
)
Frequency kHz  
INITIAL MAGNETIC PERMEABILITY vs.  
TEMPERATURE CHARACTERISTICS  
6000  
5000  
4000  
3000  
2000  
3000  
2000  
1000  
0
Material: PC40  
Temp.: 23˚C  
5000  
µ′  
PC40  
4000  
120˚C  
100˚C  
80˚C  
60˚C  
40˚C  
3000  
PE22  
2000  
µ′′  
23˚C  
1000  
f=1kHz  
H =0.4A/m  
m
Material: PC40  
f=16kHz  
0
0
100  
200  
)
300  
(
Temperature ˚C  
101  
102  
Frequency kHz  
103  
)
104  
0
100  
200  
)
300  
(
Flux density mT  
(
DIMENSIONAL RESONANCE  
RESONANCE DIMENSION vs. FREQUENCY  
CHARACTERISTICS  
Dimensional resonance is a phenomenon which increases loss  
and decreases magnetic permeability by electromagnetic standing  
waves when the magnetic field of the core frequency is applied.  
The phenomenon appears when the maximum dimension of the  
cross section of the core perpendicular to the magnetic field is the  
integral multiple of about half of the electromagnetic wavelength λ.  
103  
PE22  
PC40  
C
µ × ε  
102  
λ=  
f ×  
r
r
C: Electromagnetic wave speed in a vacuum(3.0× 108m/s)  
µr: Relative magnetic permeability  
εr: Relative permissivity  
101  
101  
102  
103  
f: Frequency of the applied magnetic field(electromagnetic wave)  
As µe decreases by inserting into the gap, using the same core  
enables high frequency wave usage as indicated by the formula  
above.  
(
)
Frequency kHz  
As dimensional resonance quickly decreases magnetic permeabil-  
ity, design the actual frequency to avoid dimensional resonance.  
In the case of possible dimensional resonance, it can be protected  
against by dividing the core in the magnetic circuit direction and  
bonding them.  
• All specifications are subject to change without notice.  
002-01 / 20071116 / e16_1.
 
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GENERAL PRECAUTIONS WHEN USING FERRITE CORE  
• When selecting the material/form of the ferrite core, while  
considering the margins select from the range in the catalog  
(product manual) display where factors such as inductance  
value, maximum saturation flux density, core loss, temperature  
characteristics, frequency characteristics and Curie temperature  
are concerned.  
• Select material that does not corrode or react in order to avoid  
insulation failure or a layer short, and also be careful to avoid  
loose winding of the core or causing damage to the wire.  
• Be careful that the equipment and tools you use do not strike the  
core in order to avoid core cracks.  
• Please consider using cases, bobbins or tape for insulation  
purposes.  
• When using cases and bobbins, select those with a heat  
expansion coefficient as close to that of the ferrite as possible.  
• When laying out the case, bobbin, coil and the ferrite core,  
create clearance between each part in order to prevent any core  
cracks and to assure insulation.  
• Please handle with care, since a ferrite core is susceptible to  
shock.  
• The outward appearance is determined according to the  
standard of our company.  
• Do not place close to strong magnets.  
• Be careful not to cause shock by the use of equipment and tools.  
• Be careful not to expose to rapid change in temperature, since it  
is also susceptible to thermal shock.  
• Careless handling may hurt your skin, since the corners of the  
polished surface of the ferrite are very sharp, and in some  
cases, burrs may have formed on the surface.  
• Please be very careful when stacking and handling the  
containers, since some ferrite cores are heavy, and can cause  
injury, toppling or back pain.  
• Where inner packaging is concerned, please be careful not to  
damage the core when taking it out from the container since the  
packing materials used in order to prevent damage during  
transportation may make it difficult to take out.  
• Do not reprocess the ferrite core as it can cause problems, such  
as injury.  
• All specifications are subject to change without notice.  
002-01 / 20071116 / e16_1.
 

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