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Audio Description – Course 10, Non Sinusoidal Transformer Core Testing
PC40 MnZn Ferrite core

– Clip 1 Introduction – Clip 2 Course Description – Clip 3 Test Parameters – Clip 4 Test Equipment – Clip 5 Overview – Clip 6 BD437G SG – Clip 7 BD135-16 SG – Clip 8 2SC5707 SG – Clip 9 2N5681 SG – Clip 10 2SD882 SG – Clip 11 2N3055 SG – Clip 12 BUF644 SG – Clip 13 Calculation 1 – Clip 14 Summary – Clip 15 BD437G – Clip 16 BD135-16 – Clip 17 2SC57007 – Clip 18 2N5681 – Clip 19 2SD882 – Clip 20 2N3055 – Clip 21 BUF644 – Clip 22 Calculation1 – Clip 23 Conclusion – Clip 24 End of Part 6

 

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In this series we test the Ferrite Core, PC40

We test with the evaluation board 7 transistors. Test is conducted in self-oscillation and signal driven from a signal generator. This core is build to by specifications where I needed more space for winding the coil and for future array arrangement of the toroids.

 

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Course Description

Non Sinusoidal Transformer Core Testing
for PC40 MnZn Ferrite Core

– Compare a fixed power consumption to the light level output
– Use many Transistors for the test
– Compare self-oscillation to signal generator driven transistors

 

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Test Parameters

1. One evaluation board with transistors and LED array
2. PC40 MnZn 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

PC40 MnZn ferrite core, 54m SWG26 and 2 X 1.6 m 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
Frequency driven: Square wave, 50%, 5 Volt, High Z

1. BD437G, NPN TRANSISTOR, 5.7 KHz, 2000 LX, 31 mA
2. BD135-16, NPN TRANSISTOR, 5.7 KKHz, 1500 LX, 26 mA
3. 2SC5707-E, NPN TRANSISTOR, 5.9 KHz, 1600 LX, 29 mA
4. 2N5681, NPN TRANSITOR, 3.6 KHz, 1000 LX, 18 mA
5. 2SD882 , NPN TRANSISTOR, 5.2 KHz, 2100 LX, 31 mA
6. 2N3055, NPN TRANSISTOR, 5.7 KHz, 1300 LX, 23 mA
7. BUF644, NPN TRANSISTOR, 6.3 KHz, 1000 LX, 19 mA

 

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Summary

TPC40 MnZn ferrite core has a surprising performance. It is resistant to external
influences and is designed for high power applications. The critical factor for a
load like a led is the correct turns on the core. I started to use the same turns as
I started with the Nanocrystal core. It does allow me to switch over 40-80 LEDs on.
The same would work here. The 5 LED’s work only well in frequency mode. In self
oscillation the voltage is far too high and does also not allow to use increased current.
That would be fixed when the turn ration is 1:40. We need the 0.4 volt to be transformed
to 16 Volt max. On no load I get over 200 Volt on the secondary.

We move on the self-oscillation mode to show the impact

 

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We integrate our measurements into the formula

Source Voltage , 400 mV, Self-oscillation
1. BD437G, NPN TRANSISTOR, 31 mA, 0.0124 Watt, 1.1 KHz, 800 LX
2. BD135-16, NPN TRANSISTOR, 31 mA, 0.0124 Watt, 1.3 KHz, 600 LX
3. 2SC5707-E, NPN TRANSISTOR, 30 mA, 0.0120 Watt, 1.3 KHz, 750 LX
4. 2N5681, NPN TRANSITOR, 24 mA, 0.0096 Watt, 2.4 KHz, 230 LX
5. 2SD882 , NPN TRANSISTOR, 31 mA, 0.0124 Watt, 1.1 KHz, 850 LX
6. 2N3055, NPN TRANSISTOR, 31mA, 0.0124 Watt, 1.1 KHz, 600 LX
7. BUF644, NPN TRANSISTOR, 34 mA, 0.0136 Watt, 1.5 KHz, 94 LX

 

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Conclusion

The PC40 MnZn ferrite core does under this winding combination not perform to the
load. We see similar characteristics to the Nanocrystal core. Adding a high value load
would make a difference. This core is as well design for high power applications.
Based on the core dimension of 85X55X15 mm the frequency is fairly low. It does
however work into the 200 KHz. This core is a very good working all-round core with
a fairly low price tag. Especially frequency driven is where this core shines. It would
consider using it for other loads like Hydrogen generation from water or as motor driver.

 

 

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The End Part 6
Non Sinusoidal Transformer Core Testing

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