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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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002-01 / 20071116 / e16_1.
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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.
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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.
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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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