@copilot I want to measure the current of my FET while it blows up, but the Rds(on) of the FET is like 30mOhms. Would I be able to find 1mOhm shunts and measure it with a scope?
Yes, it is possible to measure the current through the MOSFET using a 1mOhm shunt resistor, but you need to consider several factors:
Selection: You'll need to find a power shunt resistor that can handle the amount of current you're planning to measure. Shunt resistors are usually rated for a particular maximum current. Make sure your selected resistor's rating matches or exceeds the current you're expecting.
Accuracy: Shunt resistors have a tolerance, which can affect the accuracy of current measurement. A higher tolerance results in less accurate measurements.
Amplification: Since the voltage drop across a 1mOhm resistor will be very small, you may need a differential amplifier to amplify this voltage before measuring it with an oscilloscope.
Placing: The shunt resistor should ideally be installed very close to the MOSFET you're measuring to minimize the voltage drop in the interconnecting wires.
Please make sure you're taking the necessary safety precautions while performing these tests, as a "blowing up" MOSFET can produce a lot of heat and potentially harmful energy discharges.
Let me know if you need help with modifying your flux.ai project to include a shunt resistor and differential amplifier.
P=I^2*R and I is the same for both the ESR of the supercapacitors and that of the FETs. This means that R determines which device dissipates more power. However, the other half of the equation is how much power each device can handle before failure. Using a small FET whose package cannot handle much heat will ensure that it fails before the large capacitors.
markwuflux
copilot