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Registered Member #916
Joined: Sat Jul 21 2007, 09:15AM
Location:
Posts: 2
I am using the following circuit (attached herewith) for high side driving of an IGBT. Details of the circuit are as follows:
1. + HV is 110 V DC from a battery bank. 2. High side Driver Used – IR 2125 3. IGBT Used – IXEH40N120D1 (60Amps/1200V - With HiperFRED ) 4. Rg – 39 Ohms / 0.25W 5. Rs – 0.1 Ohm / 2W NIWW
Load is connected between O6 and SGND in the circuit attached – Load is inductive in nature (coil of a contactor with coil resistance approx 300 Ohms). The load i.e., the contactor is located at a distance of approximately 10 meters from this circuit and there is no provision for providing any protection mechanisms or components on the load side.
I have separate power for 110 V DC at +HV and +8V for the IN – input of IR 2125 is derived through a power supply, whose input is again the same 110V DC. I already have a 4.7KOhm/0.25W resistor connected to Ground from IN pin of IR2125, so it is guaranteed that the IN pin is pulled to LOW during start-up.
I am facing the following problem:
Case 1:
When 110V DC is applied first and when the input to IN pin of IR2125 is applied, the IGBT gets the gate pulses from the IR 2125 and the load is switched ON. In this condition, if I short-circuit the load (short the contactor coil), the Gate pulses to the IGBT are switched OFF and ERR pin of IR 2125 goes HIGH, thus indicating a fault and the IGBT gets protected from short-circuit.
Case 2: If I switch OFF the 110V DC and the voltage at the IN pin, and then short-circuit the load and if I now switch ON the 110V DC, followed by switching ON the IN voltage, my IGBT is not getting protected. In this case, all Gate-Emitter-Collector of the IGBT are getting shorted. The tracks on the PCB are also getting damaged in this case.
Case 3: If I change the load to resistive, i.e., if I connect a 300 Ohms resistance as load and repeat the test as described in the above two cases, the circuit works fine, i.e., the IGBT is protected from short circuit in both the cases 1 and 2.
I have 16 such circuits in one card on the same 110V DC supply i.e., identical 16 circuits for 16 different loads.
Kindly advise, what action to take and how to come out of this problem.
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IR 2125 High Side Switching Problem
