layout proposal

[avmartugin]

for more compact and better cooling/power commutation needs to:

1. use to220 package + heatsink (just flat aluminium plate? common, but with isolation?)
2. flip power lines (also rework with large area polygons) or some to bottom side
3. flip smd to bottom side
4. maybe flip driver to bottom side to enlarge to220 heatsink area?

p.s. needs to recalculate or recheck all clearences

[0x3333]

Hi!

Thanks for taking the time to review the project.

1 - The initial design was looking for 1A max of output, which the NCE70T360D transistor should handle with no problem. But I may have missed something here.
2 - What do you mean by "flip power lines"? Flipping between top and bottom? Polygons is a good idea.
3 - I avoided populating the bottom side for easier assembly.
4 - Is the idea of the heatsink to increase current?

[0x3333]

About the image you sent, looks more compact, I would need to check the clearances.

[0x3333]

Another info, I'll probably replace the AVR with an ESP32 or something with RS485 and ethernet(Like WT32-ETH01), I've been using these lately and they are pretty good.

[avmartugin]

1 - The initial design was looking for 1A max of output, which the NCE70T360D transistor should handle with no problem. But I may have missed something here.
THT transistor w heatsink for more safety maybe? anyway if SMD needs very large polygon for cooling (w/o crossing w another lines! so hard to solve, THT w simple heatsink = easy,durable,cheap)
2 - What do you mean by "flip power lines"? Flipping between top and bottom? Polygons is a good idea.
yes, to bottom
3 - I avoided populating the bottom side for easier assembly.
ok, i see.
4 - Is the idea of the heatsink to increase current?
yes. driver to another side and easy to enlarge heatsink area as you (mosfet datasheet) needs.

p.s. ESP32-C3 (in SMD mini version) is amazing. cheap, fast n rich.

[avmartugin]

I avoided populating the bottom side for easier assembly.
idea: all SMD to one side, but THT to another (or mixed) -> still easy but compact n cheap!

[avmartugin]

mosfet in smd package cheaper. so needs to review layout again

[0x3333]

1 - The initial design was looking for 1A max of output, which the NCE70T360D transistor should handle with no problem. But I may have missed something here. THT transistor w heatsink for more safety maybe? anyway if SMD needs very large polygon for cooling (w/o crossing w another lines! so hard to solve, THT w simple heatsink = easy,durable,cheap) 2 - What do you mean by "flip power lines"? Flipping between top and bottom? Polygons is a good idea. yes, to bottom 3 - I avoided populating the bottom side for easier assembly. ok, i see. 4 - Is the idea of the heatsink to increase current? yes. driver to another side and easy to enlarge heatsink area as you (mosfet datasheet) needs.

p.s. ESP32-C3 (in SMD mini version) is amazing. cheap, fast n rich.

1 - Well, in my use case 1A is good enough, but what you said makes sense, will work on that.
2 - OK
3 - THT top side, SMD bottom would work.
4 - This would make it more reliable also, as the Mosfet can handle much more current, but would need more heatsink, which would not be possible with SMD one.

mosfet in smd package cheaper. so needs to review layout again

The difference in this case is negligible.

[0x3333]

I was looking to replace the drivers with an external board, with a single or double driver per board, this way, I can easily replace drivers or build boards with fewer drivers. Create like a mainboard and driver boards.

[avmartugin]

what do you think about this? NCE70T360K mosfet (your, but cheaper n smaller) in TO-252-2 packange and large polygon area for heating.

[0x3333]

NCE70T360K looks the same in specs. We may need a large copper area in the bottom layer connected through a via to help dissipate both mosfets.

[0x3333]

The connector should be moved down, it is above the capacitor. These connectors are large.

[0x3333]

I need to test how much current these will handle because we are using a Mosfet driver, which should drive it pretty fast, we may not have that much loss.

[avmartugin]

"I was looking to replace the drivers with an external board, with a single or double driver per board, this way, I can easily replace drivers or build boards with fewer drivers. Create like a mainboard and driver boards."
great idea! maybe power switches in separate project (and cases) + logic board. maybe just buyng SSR and create only logic
board/case? no need any feedback from power stages to logic, only detect leading edge in logic?

[0x3333]

The idea is to have dumb power boards, in case some mosfet burns or something. But without logic, the main board with only zero-cross detection, and a connector with multiple outputs, like 12, and you can connect these to each output board. But need some thinking, because of the noise, etc...

[0x3333]

maybe just buyng SSR and create only logic

I don't believe SSR would work. Its turn-on and off time is too long.

[avmartugin]

"case some mosfet burns or something. But without logic, the main board with only zero-cross detection, and a connector with multiple outputs, like 12"
if mosfet burns, only 1 channel is failed...
i think noise is less, because zero voltage switching + 50Hz freq. 500-600Khz LLC power suplies have no problems, diodes bridges at 50Hz have no problems...

[avmartugin]

"I don't believe SSR would work. Its turn-on and off time is too long." hmmm, you are right

[avmartugin]

esp32-c3 is cheaper than 1 mosfet driver. no need to separate design. but power supply should be move outside

[avmartugin]

maybe plug 24v auxial power supply to board and:

1. place esp32-c3-mini
2. place standart or widely used format dc-dc near esp32
3. place standart or widely used format dc-dc for cheaper drivers

[0x3333]

if mosfet burns, only 1 channel is failed...
i think noise is less, because zero voltage switching + 50Hz freq. 500-600Khz LLC power suplies have no problems, diodes bridges at 50Hz have no problems...

The idea to have separate drivers boards is to replace te failed ones.

[0x3333]

i think noise is less, because zero voltage switching + 50Hz freq. 500-600Khz LLC power suplies have no problems, diodes bridges at 50Hz have no problems...

Not this noise I'm talking about. Imagine that you have a long connection between the trigger and the driver. This kind of noise...

[0x3333]

esp32-c3 is cheaper than 1 mosfet driver. no need to separate design. but power supply should be move outside

I see no point in having different power supplies. BOM increases, manufacturing cost, etc. The idea having multiple channels is easy of installation, manufacturing etc.

[avmartugin]

if you reduce vertical size of power stage also you cat easily fit it on DIN rail with two side connectors:
red - logic and supplies
green - power stages
blue - power stages

auxial power supplies needs anyway in most projects.
dc-dc from mass market like alibaba is cheap and easy to change when electrolite capacitors will dies or some.
mosfet drivers with high gate voltage reqs is cheap and widely avaible.

[0x3333]

Yep, nice idea.

[0x3333]

The link that you have provided in the mail is not working.

Buddy, I hope you are been sarcastic because the link was a phishing spam...