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Audio Description – Course 6, Non Sinusoidal Transformer Core Testing
Ferrite Core N87, B64290L0699X087

– Clip 1 Introduction – Clip 2 Course Description – Clip 3 Test Parameters – Clip 4 Test Equipment – Clip 5 Overview – Clip 6 BD437G – Clip 7 BD135-16 – Clip 8 2SC5707 – Clip 9 2N5681 – Clip 10 2SD882 – Clip 11 BUF644 – Clip 12 Calculation 1 – Clip 13 Summary – Clip 14 BUF644 SG – Clip 15 BD437G SG – Clip 16 BD135-16 SG – Clip 17 2SC5707 SG – Clip 18 2N5681 SG – Clip 19 2SD882 SG – Clip 20 2N3055 SG – Clip 21 Calculation2 – Clip 22 Conclusion – Clip 23 End of Part 2

 

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In our second test serie we look at the Ferrite core N87, B64290L0699X087 from Epcos.

Product link is Here

We test with the evaluation board 7 transistors. Test is conducted in self oscillation and signal driven from a signal generator.

 

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Course Description

Non Sinusoidal Transformer Core Testing
for Ferrite Core N87, B64290L0699X087

– Compare a fixed power consumption to the light level output
– Use many Transistors for the test
– Apply Load, No load measurement
– Compare self-oscillation to signal generator driven transistors

 

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Test Parameters

1. One evaluation board with transistors and LED array
2. B64290L0699X087, N87 Ferrite Core

 

 

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Test Equipment
Tools

– EA, PS 2000 B, 84 V 5 A, Power supply
– Agilent/Keysight InfiniVision 3000 Series oscilloscope DSOX3014A
– External 19 Inch Monitor for Oscilloscope
– Gossen Mastersix light meter
– Agilent 34450 A 5.5 digit Benchtop DMM

 

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We integrate our measurements into the formula

Core, Ferrite N87, 6m SWG26 and 2 X 1.2m 16/02 EQ wire
Reference power value 400 mV and 0.030 A = 0.012 Watt
Load: 5 LEDs in series, 3 Volt 20 mA = 15 Volt and 100 mA = 1.5 Watt

1. BD437G, NPN TRANSISTOR, 5.5 KHz, 1700 LX
2. BD135-16, NPN TRANSISTOR, 7.6 KHz, 1200 LX
3. 2SC5707-E, NPN TRANSISTOR, 6.2 KHz, 1600 LX
4. 2N5681, NPN TRANSITOR, 13.3 KHz, 650 LX
5. 2SD882 , NPN TRANSISTOR, 5 KHz, 1800 LX
6. 2N3055, NPN TRANSISTOR, 5.7 KHz, 1300 LX
7. BUF644, NPN TRANSISTOR, at 38 mA, 5 KHz, 460 LX

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First Summary

The Ferrite core does resonant much longer after each trigger which
allows for more power to be transferred to the load. This is visible by the
much higher self-oscillation mode. We have a clear winner of this test.

The 2SD882.

Not only is this transistor the cheapest of them all, it performs also best.
We move on to the signal generator driven test via square wave.
We adjust for the highest brightness and then look at the current draw and
the frequency.

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We integrate our measurements into the formula

Source Voltage , 600 mV
Square wave, 50%, 5 Volt, High Z

1. BD437G, NPN TRANSISTOR, 30 mA, 0.018 Watt, 2.4 KHz, 2100 LX
2. BD135-16, NPN TRANSISTOR, 32 mA, 0.0192 Watt, 2.2 KHz, 2100 LX
3. 2SC5707-E, NPN TRANSISTOR, 31 mA, 0.0186 Watt, 2.3 KHz, 2100 LX
4. 2N5681, NPN TRANSITOR, 15 mA, 0.009 Watt, 5 KHz, 1300 LX
5. 2SD882 , NPN TRANSISTOR, 30 mA, 0.018 Watt, 2.4 KHz, 2100 LX
6. 2N3055, NPN TRANSISTOR, 32 mA, 0.0192 Watt, 2.2 KHz, 2000 LX
7. BUF644, NPN TRANSISTOR, 21 mA, 0.0114 Watt, 3.3 KHz, 1300 LX

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Conclusion

Under frequency driven High Z from a signal generator with the ferrite Core we
have a much better performance as with the NanoPerm core. Here most of the
transistors perform equal but overall, all do much better than in the previous test.
The ringing is the effect of a much lower permeability of the core material creating
a higher energy output to the load. We move on to the Metglas / Nanocrystal
core. From previous tests I can say that this core does absorb all vibrations.
this did lead to a very low frequency response. We will see.

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The End Part 2
Non Sinusoidal Transformer Core Testing

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