3C92 & 3C93 - The High Saturation & High Temperature Low Loss Power Ferrites

7/27/2019 3C92 & 3C93 - The High Saturation & High Temperature Low Loss Power Ferrites

1/6A Y A G E O C O M P A N Y


2/6

100

0

20

40

60

80

1500 2000 3000H (A/m)

2500 3500

3C94

3C92

25 %

100 C

3C92 - The new standard for high flux density applications

Incremental permeability as a function of magnetic field strength compared

FERROXCUBE has made a big move

forward in high flux density applications

with the new material 3C92. This

material is primarily intended for

output chokes in power supplies. These

carry mainly dc current with a small

ac ripple, so core losses are generallynot the first worry. Required is a

high saturation level to accomodate

a high dc current without too much

inductance loss. The energy storage

value of a choke is proportional to

the square of peak flux density and

determines the core volume required.

Whenever space is limited, this is an

important consideration.

FERROXCUBE's new power material

3C92 for high flux density applications

has an increased Curie temperature

compared to the general purpose

power material 3C94. Because of this,

3C92 has a higher saturation flux

density than 3C94 and the difference

increases with temperature. Losses

are the same as for 3C94 which makes

3C92 also suitable for high flux density

transformers.

High flux density performanceIn the graph below the current

carrying capabilities of 3C92 and

3C94 are compared. The magnetic

field strength H is proportional to the

current I and the effective permeability

e is proportional to the inductance.

All curves have been measured on

gapped toroids with the same e value

to make them directly comparable. In

the fall-off region 3C92 gains about

25 % on 3C94.

Preferred applications are:

High current output chokes

Wherever space is at a premium like

in low profile converter modules, core

volume can be reduced. The advantage

increases with temperature.

High voltage ignition transformers

For example in electronic lighting

ballast where high flux density occurs

during ignition, but losses have to be

low during steady state operation.

100

0

20

40

60

80

1500 2000 3000H (A/m)

2500 3500

3C943C92

30 %

130 C


3/6

CONDITIONS VALUE UNIT

i 25 C, 10 kHz, 0.1 mT 1500 20 %

a 100 C, 25 kHz, 200 mT 5000

B 25 C, 10 kHz, 1200 A/m

100 C, 10 kHz, 1200 A/m140 C, 10 kHz, 1200 A/m

540

460 400

mT

Pv 100 C, 25 kHz, 200 mT

100 C, 100 kHz, 200 mT 50

350

kW/m3

DC, 25 C 5 m

Tc 280 C

density 4800 kg/m3

0 40 80

800

600

200

0

400

120T ( C)

Pv(kW/m )3

3C92

o

f(kHz)

B(mT)

200 100

100 10025 200

100 200

Specific power losses for several frequency/

flux density combinations as a function of

temperature

1 10 102

10 4

f (MHz)

' ,s ''s

10 3

10 2

1010 1

3C92

''s

's

Complex permeability as a function of frequency

10000

50 50 250 3500

150

2000

4000

6000

8000

i

T ( C)o

3C92

Initial permeability as a function of temperature

25 50 1200

500

0400 800

100

200

300

400

250H (A/m)

B(mT)

3C92600

25 oC

100

o

C

Typical B-H loops.

0 100 200 400

8000

6000

2000

0

4000

300

a

B (mT)

3C9225 oC

100 oC

Amplitude permeability as a function of peak

flux density

102 103

10 3

10

H (A/m)

10 4

3C92

101

10 2

Incremental permeability as a function of

magnetic field strength

102 10310

B (mT)1 10

10 4

Pv(kW/m )3

3C92

102

10 3

500

kH

z

25

kH

z

200kH

z

100kH

z

T = 100 oC

Specific power loss as a function of peak flux

density with frequency as a parameter

3C92 - Material Characteristics


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FERROXCUBE proudly presents its

high temperature power material :

3C93. Most soft Ferrites for power

applications have a loss minimum

between 80 and 100 C. They have

been designed for operation in normal

PCB circuits. For safety reasons themaximum working temperature

is not far above 100 C. At higher

temperatures the commonly used

PCB materials degrade or can even

give rise to fire hazard. Certain power

applications however require or can

benefit from working temperatures

clearly exceeding 100 C. Typical

examples are electronic lighting

ballasts and automotive electronics

mounted in the neighbourhood of the

engine.

FERROXCUBE has available the

power material 3C93 aiming at these

high temperature applications. The

loss level is comparable to that of the

general purpose power material 3C94,

but the loss minimum has shifted

from 100 to 140 C. The temperature

shift is largely independent of the

flux density and frequency condition.

The result is a considerable gain in

performance at temperatures above120 C. Lowering the overall loss level

would not have eliminated the risk

of instable temperature behaviour

due to the positive temperature

coefficient of losses in this region.

Also saturation flux density at higher

temperatures has been improved in

comparison with 3C94, which makes

3C93 suitable for chokes as well as

transformers.

High temperature performance

The graph below shows the loss

versus temperature curves of 3C93

and the standard power materials

3C91 and 3C94. Clearly, 3C93

achieves a lower loss level with stable

temperature behaviour at elevatedtemperatures favouring applications

like :

Automotive electronics near the

engine. Ambient temperature rises to

very high values here. Components

mounted near the engine are usually

specified for working temperatures up

to 150 C.

Electronic lighting ballasts

Due to tight mounting in the

lamp armature, there is already a

considerable temperature rise from

outer to inner ambient. Upward

shift of the loss minimum allows for

compacter or less critical designs.

1000

0 20 2000

100

200

400

600

800

T (C)

40 60 80 120 140 160 180

Pv(kW/m3)

3C94 3C933C91

Power losses at 100 kHz and 200mT as a function of temperature compared

3C93 - The new standard for high temperature applications


5/6

CONDITIONS VALUE UNIT

i 25 C, 10 kHz, 0.1 mT 1800 20 %

a 100 C, 25 kHz, 200 mT 5000

B 25 C, 10 kHz, 1200 A/m

100 C, 10 kHz, 1200 A/m140 C, 10 kHz, 1200 A/m

520

430

360

mT

Pv 140 C, 100 kHz, 100 mT

140 C, 100 kHz, 200 mT

140 C, 500 kHz, 50 mT

50

350

300

kW/m3

DC, 25 C 5 m

Tc 240 C

density 4800 kg/m3

40 80 120

800

600

200

0

400

160T ( C)

Pv(kW/m )3

3C93

o

f(kHz)

B(mT)

200 100

100 10025 200

100 200

Specific power losses for several frequency/

flux density combinations as a function of

temperature

1 10 102

10 4

f (MHz)

' ,s ''s

10 3

10 2

1010 1

3C93

''s

's

Complex permeability as a function of frequency

10000

50 50 2500

150

2000

4000

6000

8000

i

T ( C)o

3C93

Initial permeability as a function of temperature 25 50 1200

500

0

400 800

100

200

300

400

250 H (A/m)

B(mT)

3C93600

25

o

C100 oC

Typical B-H loops.

0 100 200 400

8000

6000

2000

0

4000

300

a

B (mT)

3C9325 oC

100 oC

Amplitude permeability as a function of peak

flux density

102 103

10 3

10

H (A/m)

10 4

3C93

101

10 2

Incremental permeability as a function of

magnetic field strength

102 10310

B (mT)1 10

10 4

Pv(kW/m )3

3C93

10 2

10 3

500

kH

z

25

kH

z

200kH

z

100kH

z

T = 140 oC

Specific power loss as a function of peak flux

density with frequency as a parameter

3C93 - Material Characteristics


6/6A Y A G E O C O M P A N Y

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3C92 & 3C93 - The High Saturation & High Temperature Low Loss Power Ferrites

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Transcript of 3C92 & 3C93 - The High Saturation & High Temperature Low Loss Power Ferrites