Author Topic: Voltage doubler + halfbridge capacitor tips  (Read 517 times)

Offline theseventhsu

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Voltage doubler + halfbridge capacitor tips
« on: January 07, 2024, 10:32:26 AM »
Hello everyone!

I come from a motor control background, and have started working on my first DRSSTC: a small, single-PCB design using an isolated half-bridge gate driver IC instead of GDTs. However, I live in 120Vrms land, and would like to use a voltage doubler to power my bus. After doing some extensive reading and perusing many schematics, I came up with two potential designs for how the halfbridge and doubler capacitors could be arranged:



(Bus bleeder resistors missing for now)
I've seen both in use in prominent designs, and I'm split: it seems that the second one (with film caps dividing the primary) would be better due to their inherently lower losses and the current that needs to cycle through them, but I read some application notes that said that too little capacitance in said divider can lead to the middle drifting away from Vbus/2. Can someone run me through the technical justification of choosing one over the other? Is there a third, better layout I may have missed?

Thanks!

Offline flyingperson23

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Re: Voltage doubler + halfbridge capacitor tips
« Reply #1 on: January 07, 2024, 04:13:25 PM »
Typically, the first design is used because it's cheaper, easier, and works fine, especially on small (to-247 size) coils. Bigger ones probably would use the first design as finding extra splitting capacitors is expensive and a pain, but bigger coils tend to be full bridges. I'm told you can also just split the MMC. Tldr; either should work fine, I've only used the first and had no problems with it.

Offline Mads Barnkob

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Re: Voltage doubler + halfbridge capacitor tips
« Reply #2 on: January 07, 2024, 06:17:10 PM »
You might find some information from this old thread: "Difference between DC Link and Snubber Capacitors  (Read 5788 times)" https://highvoltageforum.net/index.php?topic=238.0
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Re: Voltage doubler + halfbridge capacitor tips
« Reply #2 on: January 07, 2024, 06:17:10 PM »

 


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