Help cut off the power supply to release the voltage

House1989

Help cut off the power supply to release the voltage [Copy link]

I recently encountered a problem. Because the power supply voltage was released too slowly, the main chip reset disordered and some functions could not be used normally. The switching power supply usually has a relatively large capacitor at the output end, so after the power is cut off, the voltage at the output end is slowly reduced. I need help with a hardware circuit that can quickly reduce the power of the switching power supply after the power is cut off.

仙猫

Usually, a diode can be used for discharge. But no one shows the existing circuit diagram. What problem can be solved by closing your eyes?

qwqwqw2088

If the power supply output is powered on too quickly, a surge will be generated, which will damage the main chip and its surrounding circuits. You can find ways to control the main chip itself, such as delaying the power-on reset time and turning on undervoltage protection.

chunyang

We should start by improving the reset mechanism.

曹伟1993

Add a diode or something to quickly consume the power, but this is not the solution to the problem. You should correct your reset circuit.

13308486471

Add a fake load