singlebeansoup @singlebeansoup

Nice, looks great! I don’t think people realize the complexity behind power supply design and what is happening physically. We’re really lucky to have plug and play solutions for converters, thinking low-voltage/low-power bricks or IC’s. It’s extremely multi-variable, as your app shows.

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singlebeansoup @singlebeansoup

2 months ago

@zackslab Simplis Elements (free version) my friend

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singlebeansoup @singlebeansoup

2 months ago

@DanielBogdanoff Power electronics design for radars and military vehicles

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singlebeansoup @singlebeansoup

2 months ago

@BowTiedNiners Forgot to mention LJ Schooners as well. Restaurant and oyster bar on a marina. Not in Destin, in Bluewater on the north side of the Mid Bay Bridge, but that spot is a banger.

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singlebeansoup @singlebeansoup

3 months ago

@zackslab @i2cjak I don’t know much but I’ll try to help where I can

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singlebeansoup @singlebeansoup

3 months ago

@zackslab @i2cjak Sure thing man

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singlebeansoup @singlebeansoup

3 months ago

Well, there’s a couple ways, and implementation can become complicated. The most popular I believe is droop control/load slope, which increases the output impedance (dropping the output voltage) of the supply that’s sourcing more current. This is done by adding a proportional term to the outer loop, and is heavy on control theory. In theory you can do this by adding a pot to the output, but they’re lossy and eat away at efficiency, not practical. This is something I’m actively studying, as we implement this at work. I’m not the most familiar with this but know this is a popular method for active current sharing. I’ve included a picture to try to explain this simply, it can be confusing. If you’re only worried about current sharing at max load, an easier approach is adding an output current sense signal to your outer loop, in parallel with your voltage feedback that drives the error amp. When you reach your desired current limit, your controller will shut off and on, hovering around that desired output current, however it’s not on a cycle by cycle basis like your primary current sense, so make sure you have overcurrent protection built in if the bandwidth of this loop is really low. In theory, in the same way the voltage feedback controls the threshold for the ramp at the comparator, your sensed output current can do the same, controlling when your converter turns on and off. Lots of app notes for the former, search droop control, I didn’t have much luck searching for load slope. The former, I am unsure on app notes. I would recommend implementing some control to disable one phase or the other and verify they operate properly at max load first, then trying to parallel them.

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singlebeansoup @singlebeansoup

3 months ago

Slope compensation was introduced to combat instability inherent in current mode control (subharmonic oscillations, see Ray Ridley) due to input perturbations. Slope compensation adds artificial ramp to the ramp generated by your inductor’s sensed current. It “compensates” the slope to combat these oscillations. You’re essentially adding more voltage-mode control to your current-mode loop, it’s a hybrid. This occurs in the “inner loop” to the input of the comparator, not the “outer loop” where your feedback voltage comes in to the error amp. I would recommend Birchia Digital on YouTube, he does a wonderful job explaining it.