I want to save the energy but in order to be sure that i saved all the energy possible I need to calculate the energy available in the first place.
If you think the source impedance is 4R you should have a matched 4R load for maximum power transfer.
If the Vpeak is now 12.5V, then you have should have 11.5Vpk after a diode
For maximum energy capture you need to utilise the -12.5V swing, so a simple transformer would enable a FWBridge with isolation.
As the voltage is now much higher than the first test, you could use a lower 1:n step transformer.
You have shown only a voltage waveform. A voltage alone doesn't have energy. Energy is the product of voltage and current (which you haven't specified, but which flows into the capacitor as it charges).I need to calculate the energy available in the first place
But please be aware that after the diode I will have a capacitor and a resistance so how should I make its impedance 4R?
What do you mean by a FWbridge with isolation?
thanks
Hi,
Ok you answered one question, but why do you want to save the energy in the first place, what purpose is this going to serve?
Hi again,
Also, using a capacitor to store energy from a voltage source is not such a good idea because there is always half the energy lost in the transfer. It seems like if you reduce the resistance to a lower value that there would be less loss and thus more energy stored in the capacitor, but that's not how it works. As you reduce the resistance, the peak current goes up and so does the dissipation, but it's over a shorter period of time so the overall energy loss stays the same.
Now do the same with an inductor in place of the second cap and we can get much more of the energy to transfer from the cap to the inductor, but we have to know when to cut the connection or else the inductor will give the energy back to the capacitor. It's still not 100 percent efficient because the resistor has to conduct current at least part of the time, but it ends up much much better. The real problem though is when to cut off the circuit.
So i have good reason for asking the questions i have asked.
Considering only the first half cycle of the waveforms.
When the load was 1R the Vpk was 5V,,, so thats W1=V^2/R = 25/1 =25Wpk
with a 4R load W2= 12.5^2/4 = 39Wpk , which is a +50% increase.
If you did use a step up transformer , you would design it so that the reflected impedance of the secondary load into the primary was 4R.
If you don't have another energy source you won't be able to do the switchingPlease give me some more details on using an inductor instead of a cap and how should the switching be done?
Hi,
I am covinced that the cap will only store half the energy but this is if was charge from another cap. Is this true in case it was charged from a voltage source with 4R source impedance?
Please give me some more details on using an inductor instead of a cap and how should the switching be done?
Hi,
It's still not clear what you are trying to do here. You need to clarify what you are trying to do and what the purpose is. I think this would help to determine how to do this or if this is even possible for your application.
I am trying to store the energy in this signal and then re-transmitting its equivalent amount of energy after a
certain delay time. So I should store this energy to be used later and this should be a self powered circuit.
hi.
Two options.
I am trying to store the energy in this signal and then re-transmitting its equivalent amount of energy after a
certain delay time. So I should store this energy to be used later and this should be a self powered circuit.
Hi,
Well what i need to know is what exactly is generating this energy or where does this energy come from. If you say 'a voltage source' that wont help so i'll caution you right up front. What kind of device or object is producing this energy.
As i've said before, a voltage source produces energy but the amount that gets used is dependent on the load. The maximum energy is dissipated within the source with a short circuit, but that doesnt allow any energy transfer. To allow energy transfer means to loose some of the energy that the source is developing.
There are theories about the energy contained in a signal but im not sure you are concerned so much about that because you say you want to 'capture' this energy.
What do you mean by transmitting an 'equivalent' amount of energy? Do you mean that you just need to know how much energy is available and then you will produce that energy some other way, or does the entire circuit have to do this without any additional power input?
Also, what do you mean by 'transmit', what form of transmitting the energy will you be using?
Feel free to explain exactly what you are trying to accomplish here being as detailed as you possibly can. Too little information will never get this working the way you want it to work
This waveform is generated from an electromagnetic coil I have designed but as you see the waveform is in ugly shape. I want to transform the energy of this waveform into an rectangular pulse holding the same energy.
Then I will have a train of rectangular pulses . My main concern is that whenever I receive an electromagnetic pulse I should convert it to a rectangular pulse after a certain amount of delay.
In this I will have a train of rectangular pulses where I could also play with its period. This is my main task. I hope I have explained well....
Hi,
Ok but why do you need to do this without any additional input power? It would be possible with a circuit of some practical kind but that circuit would need input power. If it can not get input power for some reason, then the best you could do is use SOME of the power from the signal itself to power the circuit which would then create the rectangular pulses.
Perhaps you could explain *why* you dont want to provide any additional power to power the circuit that could accomplish this task.
The switching device to create rectangular pulses would require a source of energy. Where is that coming from?
Edit: Are you trying to build a perpetual motion machine?
from the energy stored in the cap. Any practical circuit for this?
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