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Bogumil I’ve never seen such configuration. However after reading several application notes I will try to find exact ones it seems having these resistors is a good idea as means of protecting the driver – higher R means lower maximum current.
Summary of working solutions So far adding bypass caps on 48v rail seems to be the solution I added one 47uF 50V electrolytic and 2 0. If I decouple each FET then that would mean the cap would be placed between drain and source of each fet.
Since these will carry HF current ripple, make sure they’re rated for your ripple current use the kHz rating in datasheet. While I will have overcurrent protection in the final circuit, I still find it quite bad and would like to make sure that chances of this kind of failure are close to nonexistent. My reason for R17 and R18 is as pull down resistors to pull the gate down to make sure it doesn’t accidentally come on from disturbances if the driver happens not to drive it.
My current circuit that fails does not have the diodes over the resistor to further delay turn on.
How irf you handle it externally for a 3 phase motor 3 wires, star configuration? So far adding bypass caps on 48v rail seems to be the solution I added one 47uF orf3710 electrolytic irf 2 0. My tests show that Ohm is “ok” in terms of turn on time.
At irf310 it happened twice on the driver furthers away from 48v connector. How would you handle it externally for a 3 phase motor 3 wires, star configuration? Other people had more problems without them when using ir21xx drivers. However I’m using internal deadtime generation on the microcontroller side instead.
My tests only confirm that higher resistance increases turn on time. Add low-ESR cap s irff3710, with ripple current rated for the motor current.
To do it well you really need to add another push-pull stage NPN-PNP in between at which point you are really ramming a square peg into a round hole Is there any other driver similar to the ones I use right now that can provide much higher currents assuming current rating is the issue? You can try only my opinion, without calculations: When the circuit fails, a short circuit occurs on the supply, but nothing gets hot I have a current limit on the power supply so the short circuit current never jrf3710 5A.
It doesn’t mention it’s internally protected. Martin Increasing the Rg won’t delay the turn on time, but it would make a slow turn on. Will try this definitely for my next test.
Is it possible to go way too low here? Can the above circuit work at all or do I have to completely redesign it? I’m aware that the driver is perhaps not the optimal chip to drive these large mosfets because it can only provide mA of gate drive current.
However one of those capacitances can go to the 48V value as ir3710 bridge switches. I have also been using 0. As I mentioned in my post, these are not present on my test board right now. I think your gate R value are actually too low. I will test next week and give feedback on whether this solves the problem. Sign up or log in Sign up using Google. Martin btw, I am not overly keen on that series of devices configured that way for driving mosfets.
This can manifest itself in two ways: Add irf cap irfwith ripple irf rated for the motor current. The motor spins up to a certain point, then as I increase the motor speed current increases as well one or more of the drivers fail.
The spike will be proportional to the current, which is why it only blows at high current. You say you are already doing that so it is good. Trevor above suggested even that I use Ohm instead. So they are not part of the problem right now. You DO need to add some dead time to the signals you irg3710 this circuit with. Summary of working solutions So far adding bypass caps on 48v rail irf to irrf3710 the solution I added one 47uF 50V electrolytic and 2 0.
Martin Don’t remove R17 and R The middle one continued to switch as normal – the broken ones went into locked state with both mosfets switched on causing a short on the power rail. This seems to work. Currently I have not done any other tests besides spinning up the motor three identical circuits are used to drive one phase each.