srizbf said:
if it is an nmosfet , then you should connect the ferrite py winding to +ve supply.
as 555 has 0 to +ve voltage only .
mosfet :source -->ground.
drain -->py wdg terminal 1
gate--> from 555 o/p
py wdg terminal2 -->+ve supply.
have a diode across the primary as shown
Ok, I will try that configuration now...
My current circuit is like this:
**broken link removed**
All I'm trying to see is that, a 5Vp-p pulse in primary windings is directly transferred to the secondary windings (of course there will be some loss).
After a little research I learned that a ferrite core can transfer signals with frequency up to MHz levels. Output frequency of 555 is about 50kHz. At least the first 20 harmonics of these clock pulses will be transferred successfully, wouldn't they? If so, I expect to see the very same clock pulses on the primary side.
Added after 1 hours 14 minutes:
srizbf said:
if it is an nmosfet , then you should connect the ferrite py winding to +ve supply.
as 555 has 0 to +ve voltage only .
mosfet :source -->ground.
drain -->py wdg terminal 1
gate--> from 555 o/p
py wdg terminal2 -->+ve supply.
have a diode across the primary as shown
I tried your suggestion:
Vcc = 5V
Average current drain = 175mA
555 frequency = 50kHz
Circuit:
**broken link removed**
Gate voltage:
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2 V/square
Source voltage ("source" pin of 6N60), with commutating diode:
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2 V/square
Source voltage ("source" pin of 6N60), without commutating diode:
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2 V/square
Primary winding current (drain current):
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10 mV/square on 0.1 Ohm resistance ==> 100 mA/square
Primary winding voltage, with commutating diode:
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1 V/square
Primary winding voltage, without commutating diode:
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1 V/square
Secondary winding voltage, with commutating diode:
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1 V/square
Secondary winding voltage, without commutating diode:
**broken link removed**
1 V/square
When you compare primary and secondary winding voltages, you see that the waveform in primary windings is successfully transferred to the secondary windings.
The problem here is driving the primary windings. As you see from primary windings voltage waveform, I cannot drive the primary windings with a full 5V swing voltage. I want to achieve this. Can you please suggest me how to do it?
And a critical issue: my final purpose on this project is to drive the primary windings with 310V and obtain 5V on the secondary windings. Please refer to
this thread for more information. That's why I placed the transistor on the GND side. This current circuit is only for testing and learning the principles of the ferrite core transformer.