Problem with constant dc supply by capacitor

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Discussion Overview

The discussion revolves around obtaining a constant DC voltage from a capacitor to supply a device. Participants explore methods to maintain voltage levels as the capacitor discharges, addressing practical applications in circuit design.

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant expresses a challenge in maintaining a constant DC voltage from a capacitor when connected directly to a device, noting that the voltage drops and may not be sufficient for operation.
  • Another participant suggests using a voltage regulator as a potential solution.
  • A different participant provides a link to a 5V DC boost regulator as an example of a possible approach.
  • Another suggestion includes using a SEPIC DC-DC converter, which could manage the voltage as the capacitor discharges, allowing for regulated output even when the capacitor voltage falls below the desired level.
  • A later reply asks for feedback on whether the provided suggestions are helpful.
  • One participant confirms they have implemented a voltage regulator in their circuit, indicating a positive outcome.

Areas of Agreement / Disagreement

Participants present multiple approaches to the problem, including voltage regulators and DC-DC converters, but there is no consensus on a single best solution. The discussion remains open with various suggestions being explored.

Contextual Notes

Some assumptions about the specific requirements of the device and the characteristics of the capacitor are not detailed, which may affect the applicability of the proposed solutions.

Apache
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I have a problem
how can i obtain a constant value of dc voltage from a capacitor(dynamo) to supply a device..
As we know if the capacitor is directly connected to the device, the voltage will drop and the device will not have enough voltage to function.
what is a better way?
 
Engineering news on Phys.org
voltage regulator.
 
Apache said:
I have a problem
how can i obtain a constant value of dc voltage from a capacitor(dynamo) to supply a device..
As we know if the capacitor is directly connected to the device, the voltage will drop and the device will not have enough voltage to function.
what is a better way?

Or you can use a SEPIC DC-DC converter, which would allow you to have the capacitor voltage initially above the output regulated voltage, and as the capacitor discharges, its output voltage can fall below the output regulated voltage:

http://en.wikipedia.org/wiki/Single-ended_primary-inductor_converter

.
 
@Apache: any of this help at all?
 
Yup, I have fix a voltage regulator in my circuit, thanks!
 

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