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  1. hubble

    Capacitor charging using low voltage supply

    Thanks all for the guidance; especially you, Hero999. I replaced the converter ic with the new one and now everything is fine. I think it had something to do with voltage feedback pin of the regulator. Nevertheless, it is working fine now with slightly less efficiency due to not so efficient...
  2. hubble

    Capacitor charging using low voltage supply

    Here are some more observations: Condition: Capacitor is charged to about 30 V. Case 1: Nothing is connected at the output. Almost same voltage as that of the capacitor. Case 2: Only resistor at the output. I see only 1.5 V at the output with the current remaining unchanged at around 18 mA...
  3. hubble

    Capacitor charging using low voltage supply

    Someone around to help me............please?
  4. hubble

    Capacitor charging using low voltage supply

    The circuit is designed on a perforated board. However, it is compact in component placement. LTC3639 is very small, so very thin magnet wires (enameled copper wire with almost zero resistance) needed to be connected to its leads in order to be able to have them soldered to other components...
  5. hubble

    Capacitor charging using low voltage supply

    Yes, the inductor is not exactly the same. But, does it have so much affect on the circuit? What other type of inductor can be suitable for this type of application? I have followed datasheet to implement the schematic. I have posted the schematic. Thanks. PS: Can it be because of inductor...
  6. hubble

    Capacitor charging using low voltage supply

    I finished putting together all the components. One component I am not sure about is the inductor. The datasheet mentions to use ferrite pot-cored type which is not available here. Instead, I managed to get the one which looks like as it is shown in the extreme left in this...
  7. hubble

    Capacitor charging using low voltage supply

    A 100 V capacitor.......sounds good. But then, it should be available here in the milifarad capacity range. I shall try to find it. If I am able to get this, shall I need to connect this capacitor directly to the input pin of the converter? In the datasheet, there is a small 100 V cap across the...
  8. hubble

    Capacitor charging using low voltage supply

    I would have wanted it to last for as long as it can. But for this prototype, the requirement is under 120 sec. Yes, I am. Once the capacitor is fully charged then only the load is going to be activated. Shall I directly connect the capacitor to the input of buck regulator? Thanks.
  9. hubble

    Capacitor charging using low voltage supply

    Earlier, I planned to use super capacitor of 2- 5 F 2.7 V. However, these capacitors are very expensive here, if available at all. Instead, high voltage mF caps are readily available. It is because of this reason the generator voltage is needed to be raised to high voltage of around 50 V (safe...
  10. hubble

    Capacitor charging using low voltage supply

    Ok, I understood it. I have one more situation. How do I connect this capacitor to the LTC3639 buck converter. Does it need to be directly connected to Vin? Also, how to select components to get the desired output from this converter apart from 3.3 V, 5 V? Thanks.
  11. hubble

    Capacitor charging using low voltage supply

    I am not able to understand the point of using transistor here. Can I not just connect the 10 mF capacitor across the zener diode to charge it? Thanks.
  12. hubble

    Capacitor charging using low voltage supply

    Thanks for your response. Can I use 50 - 51 V zener diode after the voltage is rectified? Won't I be wasting lots of energy in the process? I shall try to find the 230 V to 24 V transformer. Thanks.
  13. hubble

    Capacitor charging using low voltage supply

    I apologize for delay in getting back. Actually, my mom met with an accident so I had to take care of her and couldn't do any other work in these 20-25 days. But, now she is recovering well. In the meanwhile, I dropped the idea of using voltage multiplier and instead thought of using...
  14. hubble

    Capacitor charging using low voltage supply

    After days of trying to choose between different ways, I chose to go with the CW multiplier. Tried to charge for more than 30 sec with 1n4007 and 10 nF cap system, the 10 mF cap got charged to only 500 mV. I think I have chosen wrong value cap. Here, I tried to simulate with 7 VA 800Hz source...
  15. hubble

    Capacitor charging using low voltage supply

    Thanks for providing the link and the equation. However, can boost converter be used here in this case after rectification to raise the voltage to something around 25 to 30 volts and then use multiplier? 
  16. hubble

    Capacitor charging using low voltage supply

    I am okay with the amount of energy stored by the capacitor. Batteries, according to my information, are slow charging devices when compared with capacitors. By the way, how do I step up the voltage? Can I use some boost converter to raise it to considerable level and then use voltage doubler or...
  17. hubble

    Capacitor charging using low voltage supply

    Capacitors are the fastest components to charge according to me. They are great for storage, especially super capacitors. I had earlier planned to use planetary gear system to increase the rpm five fold but they are not readily available here nor can I design the system myself and have them...
  18. hubble

    Capacitor charging using low voltage supply

    In my previous thread, I had posted a question regarding the nature of waveform generated by stepper motor. I measured emf generated by motor using DMM and the Vrms was just over 5V. As I am not having the oscilloscope, I tried to theoretically calculate the frequency of the wave. It is a 200...
  19. hubble

    Capacitor charging using low voltage supply

    Hello, is there a good way to charge 10mF 63v capacitor to, say, 50v from a 5v 1.5khz source? Thanks.
  20. hubble

    stepper motor output waveform

    OK. Then how can the nature of this type of unknown waveform be found? Do we need some kind of oscilloscope? Thanks.
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