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Audio Description – Course 5, Non Sinusoidal Transformer Core Testing
Nanocrystal M-088-02

– 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 Load – No load – 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 BUF644 SG – Clip 22 Calculations 2 – Clip 23 Conclusion – Clip 24 End of Part 1

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In our first test serie we look at the M-088-02 Nanoperm core from Magnetec.

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. We also look if Load- No load applies for measuring the efficiency of the core material.

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Course Description

Non Sinusoidal Transformer Core Testing
for Nanocrystal Core M-088-02

– 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. M-088-02 Nanocrystal 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, Nanocrystal M-088-02, 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, 373 Hz, 1400 LX
2. BD135-16, NPN TRANSISTOR, 455 Hz, 1000 LX
3. 2SC5707-E, NPN TRANSISTOR, 375 Hz, 1200 LX
4. 2N5681, NPN TRANSITOR, 806 Hz, 520 LX
5. 2SD882 , NPN TRANSISTOR, 333 Hz, 1400 LX
6. 2N3055, NPN TRANSISTOR, 370 Hz, 1000 LX
7. BUF644, NPN TRANSISTOR, at 48 mA, 446 Hz, 400 LX

 

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First Summary

In the medium power range of transistors two chips stand out. The BD437G and
the 2SD882. Both achieve the same brightness for the same power requirement.
From a cost factor the 2SD882 is less than half of the price of the BD437G and has
also a smaller footprint. These values are only valid in combination with the
Nanocrystal core and this load. It might be for other combinations that other
transistors will perform better. 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.
We will also investigate the no Load current requirement. This is a traditional test in
sinusoidal systems which determines the core efficiency.

 

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Summary

 

 

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Second Summary

 

 

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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, 0.018Watt, 150 Hz, 1000 LX
2. BD135-16, NPN TRANSISTOR, 7 mA, 0.0042 Watt, 700 Hz, 560 LX
3. 2SC5707-E, NPN TRANSISTOR, 16 mA, 0.0096 Watt, 270 Hz, 1000 LX
4. 2N5681, NPN TRANSITOR, 17 mA, 0.0102 Watt, 255 Hz, 1000 LX
5. 2SD882 , NPN TRANSISTOR, 31 mA, 0.0186 Watt, 165 Hz, 1300 LX
6. 2N3055, NPN TRANSISTOR, 7 mA, 0.0042 Watt, 650 Hz, 520 LX
7. BUF644, NPN TRANSISTOR, 19 mA, 0.0114 Watt, 230 Hz, 1100 LX

 

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Conclusion

Under frequency driven High Z from a signal generator not every transistor
does perform. We have technical only voltage and almost no current.
We could have changed to 50 Ohm but that current would be substantial.
It would give us 100 mA at 5 Volt or 0.5 Watt for the base of the transistor.
In a low energy system that would defeat the objective.
We would have to generate the voltage for the transistor base
and for the multi vibrator like a 555 or better, the low voltage high frequency
TS555 chip I always use. Still, 3 Volt and a couple of mA needed for it. Too
much for my high efficient energy system.
No current draw does not work for non sinusodial transformer currents. The
correct ratio is again visible under high frequency, when the impedance or
reluctance of the primary is high enough to stop current to flow from the back
EMF, when a load is applied to the secondary coil, more current is drawn.

 

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The End Part 1
Non Sinusoidal Transformer Core Testing

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