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Sch is as follows
Test result is as follows ( adding a series resistor in the resonant network, and test this resistor's voltage. R34 in the sch is this series resistor, with the value of 0.2R )
Note:First waveform is the voltage across R34.
We can see that the resonant current(voltage across R34) is very strange, is there someone else having the same experience?
And could somebody tell me why?
But if i use the Current Transformer made by myself using a ferrite toroid core, test result is as usual.
Hi Oliver,
Of course i didn't use the differential probe because i cannot afford.
As you said, the better way to test resonant tank current will be using a current probe or current transformer and it works well.
Although i only can use a CT, also because i cannot afford a current probe.
Hi Jankel
You could try to put the resistor between GND and CBB - Red X below - and measure the current there instead using a single ended probe ('scope probe).
This has the advantage that there is no large common mode voltage signal like that at the position of R34 so you should be able to get a clean signal. The currents at the two positions will be the same - less that drawn off by the OC network, C11 etc...
Regards
Colin