Saturday 16 September 2017

voltage - Dynamic Braking MOSFET Control Circuit



I am dealing with a regenerative power situation with BLDC motor and servo drive controller.The power supply is 48V regulated DC but during deceleration due to regeneration, the voltage at drive increases beyond 48 V



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I plan to dissipate the reverse current through power resistor in the form of heat. To achieve this dynamic braking, the driver circuit for MOSFET switch has to turn ON during regeneration when voltage exceeds certain limit and turn off when the voltage drops. I tried looking for hysteretic comparator to generate signal for switch but could not find for such voltage level. Can you suggest any different technique for controlling the Braking MOSFET switch?




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