Why does the power supply protect itself?

stm32f103vct6

Why does the power supply protect itself? [Copy link]

As shown

The control signals of the 6 bridges are not added, and the motor is not connected. The purpose is to add a 12V voltage between DC_MOT and ground, but why does the DC regulated power supply protect itself and not output?

maychang

"The control signals of the 6 bridges were not added and the motors were not connected"

It must be that the gates of your six MOS tubes are floating. When the gates of MOS tubes are floating, it is uncertain whether the tubes are conducting. If the tubes are conducting, the power output will be short-circuited, and the power supply will of course enter the protection state.

maychang

Of course, another possibility is that some of the 6 tubes were damaged before or during welding. This can only be determined by disassembling and carefully measuring each tube.

qwqwqw2088

Add 12V voltage between DC_MOT and ground

Does it mean that the G pole is suspended in the air?

After the G pole is suspended, the induced voltage has no release circuit.

1399866558

1. Maybe the chip you bought is refurbished and has a code inside. 2. Is the MOS tube broken during welding? 3. Is the circuit diagram drawn wrong, that is, is the package correct? 4. You can find the problem by testing it yourself with a multimeter.

阿卡时间段

Is the tube a depletion-type MOS tube?