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I have designed short circuit protection circuit that you can find in the image.

ShortCircuitProtection

https://i.hizliresim.com/ZXPvWz.jpg

When you supply 24V from L1 pin and there is no GND(no short circuit) in L2 pin, circuit conducts L1-24V to L2 pin. If there is a short circuit in L2 pin, circuit switch off the gate.

When i test the circuit by shorting L2 to GND , sometimes it can not separate L2 from L1 because bc817s are still a little conducting, overcurrent flows from drain to source over protection diode of mosfet and p channel mosfet(FDS9958) is being damaged.

What can i do to improve stability of this circuit?

Many thanks,

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  • \$\begingroup\$ The circuit seems overly complex for what it actually does. What exactly is the function of Q10, R10 and R13? \$\endgroup\$ – Dave Tweed Apr 2 at 13:28
  • \$\begingroup\$ I've designed NAND Gate with Q10 and Q9. Mean, if L1 has 24V and L2 has 24V over L1 and R9 , open the gates:) (conduct L1 to L2) \$\endgroup\$ – Gkhan Apr 2 at 13:38
  • \$\begingroup\$ What max current can the 24V source provide? \$\endgroup\$ – Huisman Apr 2 at 20:15
  • \$\begingroup\$ Max current is 1A \$\endgroup\$ – Gkhan Apr 3 at 8:13

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