# Voltage multipliers

#### vijay kumar myakam

Joined Jul 4, 2017
1
Hi
I am an electrical engineer working in a start-up company we are working on high voltage power supplies. Can you please explain how a ripple capacitor is calculated in voltage multiplayer. Or share any documentary on high voltage multiplayers.

Thank you..

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#### Ya’akov

Joined Jan 27, 2019
6,857
Welcome to AAC.

You might have more luck with a properly spelled search for "voltage multiplier".

Is this classwork? I know you said you are an electrical engineer at a startup but your bio says, "student".

#### Janis59

Joined Aug 21, 2017
1,537
Player plays in the multiplayer orchestra... OK, just let make a querry in Google, its a literally tons of sci articles on this theme. Concrete methodology depends strongly from concrete topology as well from strategy for capacitors - all capacitances equal, or changing from larger to smaller etc. Probably, You hadnt return the querry results because of misspelling the name - must stand multiplier not multiplayer. For example
https://www.instructables.com/High-Voltage-Multiplier/
https://itecnotes.com/electrical/electronic-voltage-multiplier-calculations/
https://electronics.stackexchange.c...-capacitance-for-a-voltage-multiplier-circuit
https://www.extremeelectronics.co.uk/calculators/cw-voltage-calculator/
https://www.electronics-tutorials.ws/blog/voltage-multiplier-circuit.html
Or scientific publicats via Google Scholar
https://www.hindawi.com/journals/jece/2017/4805268/
https://aip.scitation.org/doi/abs/10.1063/1.1683930
https://www.sciencedirect.com/science/article/abs/pii/0029554X69904686
https://ieeexplore.ieee.org/abstract/document/502213
https://ieeexplore.ieee.org/abstract/document/5456136
https://ieeexplore.ieee.org/abstract/document/4463866
https://ieeexplore.ieee.org/abstract/document/285489
https://ieeexplore.ieee.org/abstract/document/6153371
https://ieeexplore.ieee.org/abstract/document/5698327
https://d1wqtxts1xzle7.cloudfront.n...ALAH6ai52A__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA
https://ieeexplore.ieee.org/abstract/document/1009666
(if You have no institutional access to the ieee, may try to copy DOI and paste into wonderful Project Ultimatively Saving the Humankind I mean the sci-hub.se)

Not very sure I can understand which is "ripple capacitor" when ripple voltage is product of all capacitors and load. If indeed You are right, I mean using the LC or RC or CLC or CRCRC etc filters in otput, then just ought to use the elementary e^(-t/T) formula or just make a model into LT-Spice. Dont afraid of Spice, its free of charge And last but no least - be deadly scared about diodes t(on) and t(off) as well the i(R). In some combinations I got it tragicomic result that output gets less than input
If only it isnt 50 Hz where 1N4007 are applicable, the average 10-20 kHz system demands at least UF4007 or anything more teethy. Best ever search engine monitoring the first-hand buyers from all component plants and having search engine by parameters is Octopart.com
Other option is Digikey search engine.
Wish a luck!

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#### Janis59

Joined Aug 21, 2017
1,537
PS: Do You are from Ionics Power Solutions Pvt. Ltd.??
I see You into FB.
Global village.... My FB identity is Janis Blahins. Feel invited. High Voltage is my everyday`s bred.
Let me know if Your HV system is powerful (like those 36 kV 120 kW on which in India journal some years ago I published article). Then I shall tell another useful clues how reactive component not blow up the capacitors.

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#### Papabravo

Joined Feb 24, 2006
19,612
AFAIK there is no such thing as a ripple capacitor. In power supplies generally there are capacitors that have an effect on the voltage ripple at the output. In a buck converter the ripple is estimated with respect to the output voltage by the following:

$$\cfrac{\Delta V_o}{V_o}\;=\;\cfrac{1-D}{8LCf^2}$$

Where D is the nominal duty cycle, L is the inductor value in Henries, C is the output filter capacitor in Farads, and f is the switching frequency.

With respect to voltage multipliers as you go up in voltage the available current gets smaller and there are losses to deal with. The challenge then is to limit the losses and adjust your expectations for available current to match reality.