Author Topic: Question about the input voltage for my bridge section  (Read 840 times)

Offline BoltyTheDoge

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Question about the input voltage for my bridge section
« on: February 22, 2021, 11:25:10 PM »
Hello, I'm currently in the process of building my first SSTC, i've built simpler coils before, but this is my first time with solid state.
The question I suppose is kinda stupid, but I'm too stupid to figure this on my own. I've tried with a couple of things but nothing gets me the results I want.

The circuit was designed for 120VAC, but I'll be using 220VAC, the voltage doubler pumps up the 120V to 340V, but I don't want to get 600V+ of Vout when doubling the 220V, I'd like a voltage in the ballpark of those 340V.

How could I modify the circuit for it to be able to take 220VAC in the Bridge Section and get the desires voltage?

PS: This is a circuit designed by LoneOceans, I've only modified a couple of things, but all credits to him.

Thanks!

Offline AeraCura_

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Re: Question about the input voltage for my bridge section
« Reply #1 on: February 23, 2021, 12:21:35 AM »


This would be functionally equivelent if C8 and C9 where 4.7uF and C7 was 1000uF. Update your schematic with those changes and we can double check it.

Offline BoltyTheDoge

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Re: Question about the input voltage for my bridge section
« Reply #2 on: February 23, 2021, 05:37:45 PM »
Thank you. I've made the appropiate changes, I belive I dont need the diodes since the Mosfet itself implements them. Would this suffice? Or would I need some bleeder resistors?


Offline AeraCura_

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Re: Question about the input voltage for my bridge section
« Reply #3 on: February 23, 2021, 08:20:00 PM »
Almost there, let work through a few details to make sure we're on the same page.

First a side tangent, when we say 110VAC or 120VAC were referring to the same thing. All modern voltages in North America are transmitted at 240VAC then center tapped at 120VAC. This has to do with changes made a century ago that terminology never caught up with, This same misnomer applies for 220VAC and 240VAC. I only mention this since some numbers I work out may not line up with those you've previouly mentioned.

Next, a conversion between AC and DC can be done by reversing the RMS calculation for AC. For an AC RMS sine wave you multiply by sqrt(2) or 1.4. This is because the peak of the sine wave is sqrt(2) times higher than the RMS value.



Quote
The circuit was designed for 120VAC, but I'll be using 220VAC, the voltage doubler pumps up the 120V to 340V, but I don't want to get 600V+ of Vout when doubling the 220V, I'd like a voltage in the ballpark of those 340V.

When talking about Voltages its important to distinguish between AC and DC. When we say we're planning to use 220VAC to produce 340VDC what were saying is we will take 240VAC RMS and rectify it to 340VDC, which works out to 240*sqrt(2) = 340VDC, This is done with either a single diode rectifier or a full bridge rectifier. I encourage you to read more about it on Mads design guide https://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/rectifiers/, in summary the extra cost of a few diodes is worth it as you will require less filter caps to smooth out the ripples in your rectified mains.

You still have a few changes to make to your schematic, namely adding a rectifier and removing the extra 4.7uF capacitor labled "PP MKP". Make those changes and let me know if you have any further questions.

EDIT:

Make sure and change the voltage rating for the 1000uF filtering capacitor, it should be at least 350VDC rated.

Quote
I belive I dont need the diodes since the Mosfet itself implements them.
Those Diodes are there to suppress transient voltages that may damage the IGBT, for your 600V devices you can string two 1.5KE220CA just like in the image.

Quote
Or would I need some bleeder resistors?
You should re-add the bleeder resistors, calculate their values according to the guide. https://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/dc-bus-capacitor/

« Last Edit: February 23, 2021, 09:03:21 PM by AeraCura_ »

Offline BoltyTheDoge

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Re: Question about the input voltage for my bridge section
« Reply #4 on: February 23, 2021, 09:52:55 PM »
I see, thank you so much! This would be the final circuit:

Don't take into account the way the Full bridge rectfier is oriented, it's just for reference.

« Last Edit: February 23, 2021, 09:56:01 PM by BoltyTheDoge »

Offline AeraCura_

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Re: Question about the input voltage for my bridge section
« Reply #5 on: February 23, 2021, 10:14:27 PM »
The rectifier isnt connected correctly. An exercise to test this is to trace the resulting waveform at the output of rectifier for each half cycle of the sine wave.

In the image above you should see that during the positive half cycle the sine wave has a path through the the resistor using the red diodes and during the negative half cycle it has a path though the blue diodes.

Quote
Don't take into account the way the Full bridge rectfier is oriented, it's just for reference.
Noted.

Offline BoltyTheDoge

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Re: Question about the input voltage for my bridge section
« Reply #6 on: February 23, 2021, 10:22:03 PM »
Haha, many thanks again!

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Re: Question about the input voltage for my bridge section
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