Not sure what you are trying to do. An active rectifier will do what you want. If it's some sort of energy harvesting , then active rectification
won't be the correct answer. Using schottky diodes would also help , but you will still lose some voltage in the bridge.
can you specify the max voltage of the cap
also post the max signal voltage
i think that the signal voltage is more than that of the capacitor voltage
You are apparently assuming an ideal voltage source supplying the waveform. That's completely unrealistic because it would involve infinite energy. A real energy source has an impedance. It must be known to design an energy harvesting circuit.
I think the fact that the capacitor has not discharged enough after the first pulse that the second pulse has no effect means your cct is getting all the power it needs.
No point in trying to add more power to the cap , it has enough. Or I'm missing the point :0)
Another option is some sort of switch to switch in another cap after th e first has been charged , storing the second pulses energy on a second cap.
I mainly wanted to point to a problem not yet considered in your thread. The output voltage of your waveform will change with load impedance and the harvested energy amount, too. For a single pulse there will be "optimal" capitance value that collects most energy. The problem is more difficult for the oscillating waveform. Generally speaking, a switched mode converter would be able to present a time varying matched load to the source during the waveform course and pull maximum energy from it.This pulse is generated from a coil so I really don't know what the output impedance is? suppose I know it how can I charge all the energy?
I mainly wanted to point to a problem not yet considered in your thread. The output voltage of your waveform will change with load impedance and the harvested energy amount, too. For a single pulse there will be "optimal" capitance value that collects most energy. The problem is more difficult for the oscillating waveform. Generally speaking, a switched mode converter would be able to present a time varying matched load to the source during the waveform course and pull maximum energy from it.
The best way to evaluate optimal energy harvesting involves a physical model of the source.
The second pulse won't discharge the cap because of the diode.
yup the load also has some impedance and so if your op current is low it may well be lost in the wires or the load connected to the lets
The option to store the energy to multiple switched capacitors as suggested by neddie can be easily implemented, utilizing the energy at different voltage levels is the more demanding design part.
Alternatively, you can add inductive storage elements to translate voltage levels and possibly collect the energy in a single capacitor. But all suggestions are more or less arbitrary with no knowledge of source impedance.
You apparently recorded an open circuit voltage waveform. The short circuit current wavefom would add much infomation.
You can also record the transducer voltage with different resistive loads an determine the total energy delivered to it. Ultimately, a complex load impedance may be required to pull maximum energy.
I don't know if it's easy to design a physical model based on a-priori knowledge about the transducer.
In thís case, the open circuit voltage waveform, and/or a waveform with different load would be interesting.this waveform you have seen here is for a 1 ohm resistance load. I hope that this may help.
In thís case, the open circuit voltage waveform, and/or a waveform with different load would be interesting.
Reviewing your initial posts, I wonder what has been exact load with the bridge rectifier + capacitor setup. The results don't seem to match post #15 + #17.
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