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The brake works by turning off the low side driver and applying a pwm to all 3 high side drivers. The pwm varies depending on the amount of braking required. The trolley is powered by a lithium LiFePO4 battery with internal bms so I am not sure how much the battery recuperates.
Not sure what...
I guess so yes, I do not implement the current limit when braking. I made a mistake in my original post, I pwm the high side fet on all phases to brake not the low side.
So I suppose it could be drawing too much current when braking and as the current sense is not in each fet it cant be...
Sorry it is off the left of the diagram. It is a high side current measurement and is common for the whole circuit. In software it allows it to run for 30 secs at 12 amps or 2 secs at 16 amps before shutting down. As said this is all tested and works fine.
Hi
I have designed an electric trolley that is powered by a 24v bldc motor with hall sensors. I am using a 16khz pwm to make the trolley silent running. It also has a brake function where if the trolley is going faster than the desired speed it ramps down the pwm until it reaches 0, it then...
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