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Sorry, but my explanation is the good one! (I am retired electronic engineer).
Suppose that the OPA735 is not saturated, so the voltage at the inverting input is equal to that of the non-inverting input, i.e. 0V. The current of resistor R1 is - 1260V / 10M = - 126µA. This current must be...
This is not correct. The inverting input of the OPA735 is at the same potential that its non-inverting input, it means 0 Volts. So there's no current in R11.
The correct schema is: delete R11. R8 = 0 and R5 = 10 k.
You have to put a coupling capacitor like suggested by "FvM".
But read carefully my first post. If the 555's frequency is lower than the transformer resonant frequency, the 555 see a large capacitor, not an ideal transformer!
Charge and discharge of this capacitor heat the 555, and there little...
Your transformer is high voltage transformer (1 kV output), so with large number of turns in the secondary and large parasitic capacitance. Contrary to low voltage transformer, the transformer is like a resonant LC circuit and it works fine only at is resonant frequency!
This is the theory.
In practice it is also necessary to take in account of the parasitic resitor in parallel on each capacitor. Very important with DC voltage, because these resistors governs the distribution of the total voltage.
dsp lcr meter pic
The original asm file is on the .rar attachement at
**broken link removed**
I have only translated the comments and added a Warning about the modification of 100 ohms coefficient.
Regards,
Jean-Jacques
hameg8018
I return on the Russian LCR.
I tried to translate the .asm code by using various translators (BabelFish, Reversi, Prompt...) It is not perfect, but it allows to understand how the device works: principle is identical to the Elektor 's LCR, with an ADC in head (integrated into the...
HV power supply design is not so easy: indeed the secondary winding of the transformer requires many turns, and thus has a large distributed capacity; that causes parasitic phenomena of oscillations, with overcurrents and overvoltages.
Generaly you have to use resonant design.
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