Well.. it found.Hope my post find you well.
A what? A 3-phase calibrator? Like this one: https://us.flukecal.com/products/el...6003a-three-phase-electrical-power-calibrator ??I need to know this application well, because I want to develope a 3-phase-calibrator.
Then go with a class D circuit. You posted a class B/AB amplifier.Class D switching is necessary!
Until the application is not clear nobody will answer this to you.1. Why we need to think SNR for this case?
Do you mean "why we need loop gain" ? I guess you should learn fundamentals from a book, not go forward with a complex circuit like above.2. Why we need to think frequency gain voltage booster? Loop gain!
No way. There are too many. Input/output impedances, open/closed loop node impedances, mosfet/bjt transconductances/impedances... Open a book rather, please.3. Explain impedences, transcondactance etc for whole circuit.
Hmm, which???4. How the voltage and current is being controlled here?
Not clear. Centertap has 40turns if you have an autotransformer with 80turns. What is the 960turns?For CT, current transformer primary winding has 80turns, 16.5 V/1.5 A, secondary has 20Turns, 4.125v/6A output!
For PT, Potential transformer, Primary has 80turns, 15v/2A rating input, secondary has centertap!
At secondary 960turns, 360v/0.332 A and 960turns 180v/0.166A output.
Not clear... please upload a schematic.I am using TIP147, TIP142, C1815, A1015. They are properly biasd like cascaded 3 stage, may be AB class network. More symmetric way, like one pairs AB class output is connected to others pair. Last pairs base is connected to first pairs base! At last a voltage divider of 5 ohm has been made between 2nd and 3rd outputs!
Your amplifiers are class-AB that waste a lot of power by making heat. The circuit in a class-D amplifier switches on and off at a high frequency with PWM then produce a low amount of heat.
Class-D amplifier ICs have been available for 23 years and Texas Instruments make some ICs with an output power of hundreds of watts.
Here is what is in a class-D amplifier:
Once again I am blessed to find you here!
May be that technology need more effort to make sequencial PWM for firing the gates!
Here is some way to overcome "heating" and crossover distrortion!:lol:
An amplifier does not "sequentially fire gates". Instead it simply amplifies the input signal's voltage and current.
A linear amplifier has a lot of heating but a class-D high frequency switching amplifier produces low heating.
A class-B amplifier and a class-AB amplifier biased wrong produces crossover distortion but a class-D amplifier does not.
Not clear. Centertap has 40turns if you have an autotransformer with 80turns. What is the 960turns?
Not clear... please upload a schematic.
On both schematic you connect low impedance control signals to transistor collectors. Normally outputs are not connected together, I don't get it why you doing that.
Actually a lot of information is missing, I think you assume we know what did you do from the beginings when you have started your project, but we have no idea for example why did you change circuit as FvM mentioned, so please share more intels (system level block diagramms, how you imagined this project, what are the targets, specifications, why did you decide next to the last schematics, etc.).
Low frequency and high frequency phase shifts caused by a transformer will occur if the transformer is inside the negative feedback loop (when the output of the transformer provides the negative feedback). Then the amplifier must be compensated for these phase shifts.
An audio amplifier is designed to have a load impedance that is 2 ohms to 16 ohms. What are the impedances of your loaded transformers?
But audio amplifier circuits have not used output transformers for at least 55 years
In my eyes saturation of a transformer has nothing to do with current rating.If the core of an audio amplifier output transformer saturates then the transformer's current rating is too low.
Hi,
In my eyes saturation of a transformer has nothing to do with current rating.
Saturation depends on voltage rating and frequency rating.
Transformers are very sensitive on DC at the input. Only a very small amount of DC may cause a transformer to saturate.
Klaus
Hi,
I don't know which information you are looking for.
Thus I suggest an internet search:
https://lmgtfy.com/?q=cause+of+transfomer+core+saturation
Klaus
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