For my project I built a BLDC motor controller.

Now I have to cut of the controller from the battery. A relay is not easy because common my application needs >200Amps

The highside switches I found is the Voltage rating too low. The max Voltage I found was 60V.

Battery voltage is 60V and the max current about 200A.

Also I am afraid of using semiconductors because they like to shoot trough after burning...

  • 1
    \$\begingroup\$ So.. you don't want to use a relay and you don't want to use semi-conductors.. um.... yank the plug out the wall comes to mind.............. \$\endgroup\$ – Trevor_G Mar 28 '17 at 1:33
  • \$\begingroup\$ Sounds like a job for a contactor.. which is basically a relay. Something like these .hubbell-icd.com/general/100D-DC%20Devices.pdf \$\endgroup\$ – Trevor_G Mar 28 '17 at 1:39
  • \$\begingroup\$ Consider how much stored rotational and electric energy is stored that needs to be dissipated. Then consider speed brakes, mechanical or electrical with gradual braking. e.g. PWM controlled short circuit current to gnd. \$\endgroup\$ – Tony Stewart EE75 Mar 28 '17 at 1:39
  • \$\begingroup\$ You do not say what operating voltage is. Explain your overall circuit and need. \$\endgroup\$ – Russell McMahon Mar 28 '17 at 7:12
  • \$\begingroup\$ Bldc is driven by mosfets, why not disabling the driver? \$\endgroup\$ – Gregory Kornblum Mar 28 '17 at 8:12

First you cut the power of gate drivers, after you have inhibited them. Then a contactor/relay is the only option, I guess.


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