Voltage Multiplier Circuit Design

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Discussion Overview

The discussion revolves around the design and performance of a 3-stage voltage multiplier circuit, specifically focusing on the output voltage achieved from an AC input. Participants explore theoretical expectations versus actual measurements and the safety implications of working with high voltages.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant reports measuring 120 V DC output from a 3-stage voltage multiplier, questioning why it does not match the theoretical output of approximately 500 V DC based on the equation Vout(dc) = Vin(ac)*sqrt(2)*number of stages.
  • Another participant suggests the circuit resembles a "3 stage diode fryer" and questions the source of the circuit and equation used.
  • A participant references a Wikipedia article on voltage multipliers as a source for the circuit design and equation, but does not recall the specific source for the equation.
  • There is a request for suggestions on how to achieve a higher DC output when using AC input.
  • A participant expresses their goal of using a neon sign transformer to achieve a much higher DC voltage for a vacuum tube application, indicating their theoretical knowledge but lack of hands-on experience with AC mains.
  • Concerns are raised about the safety of the project, with a participant stating that the level of experience is too low to safely proceed with such high voltages, leading to a closure of the thread.

Areas of Agreement / Disagreement

Participants express differing views on the circuit's performance and safety considerations. There is no consensus on the reasons for the discrepancy in expected versus actual output voltage, and the discussion remains unresolved regarding the effectiveness and safety of the proposed design.

Contextual Notes

Participants highlight the dangers associated with working with high voltages and the importance of hands-on experience when dealing with AC mains. There is an acknowledgment of the theoretical nature of some claims without practical validation.

Who May Find This Useful

This discussion may be of interest to individuals exploring voltage multiplier circuits, those considering high voltage applications, and participants in electronics forums focused on safety and design challenges.

a15m
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I have made a 3 stage voltage multiplier. My input is from the outlet so 120 V ac. I measure my output from the first and last capacitors of the bottom row as shown in the image. The output I am getting is 120 V dc. From the equation Vout(dc) = Vin(ac)*sqrt(2)*number of stages. With this equation I should be getting around 500 V dc theoretically. I am not sure what is going on, anybody have any insight? Thank in advance.
 

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Look more like a 3 stage diode fryer. I assume you are simulating this and have not actually built anything.

Where did that circuit and equation come from?
 
If you google voltage multiplier circuit that is the circuit that comes up. You can check it out here:

http://en.wikipedia.org/wiki/Voltage_multiplier

The equation I don't remember what source but it was from a google search also.

Do you have any suggestions if I am inputting ac to multiply 3 or 4 times to get dc output?
 
a15m said:
I have made a 3 stage voltage multiplier. My input is from the outlet so 120 V ac. I measure my output from the first and last capacitors of the bottom row as shown in the image. The output I am getting is 120 V dc. From the equation Vout(dc) = Vin(ac)*sqrt(2)*number of stages. With this equation I should be getting around 500 V dc theoretically. I am not sure what is going on, anybody have any insight? Thank in advance.

a15m said:
If you google voltage multiplier circuit that is the circuit that comes up. You can check it out here:

http://en.wikipedia.org/wiki/Voltage_multiplier

The equation I don't remember what source but it was from a google search also.

Do you have any suggestions if I am inputting ac to multiply 3 or 4 times to get dc output?

What is your background and level of knowledge/experience in electronics? How much have you worked with AC Mains and high voltages in the past? What you are doing is dangerous.
 
I have theoretical experience but not any hands on. I have worked with high voltage power supplies but not with AC mains.

My actual goal is to take a neon sign transformer which gives me 9500 V and put it through my multiplier to get close to 40,000 V dc to power a vacuum tube.
 
a15m said:
I have theoretical experience but not any hands on. I have worked with high voltage power supplies but not with AC mains.

My actual goal is to take a neon sign transformer which gives me 9500 V and put it through my multiplier to get close to 40,000 V dc to power a vacuum tube.

I'm sorry, but with that level of experience, this is too dangerous for us to offer you help. Thread is closed.
 

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