fan-dev-V1.2

The 20230225 update
board has been successfully verified and can work normally when powered on when the adjustable rheostat is about 100k.
It can be adjusted to 12V, but it cannot be powered on and started when the rheostat is at 10V. The reason may be that the instantaneous current at power-on is too large, causing fuse protection or causing the power chip to shut down. Subsequently, it will be detected whether it is a power chip problem or a fuse problem. If it is the power supply For chip problems, use an oscilloscope to observe the power-on waveform.
It is expected that adding a large capacitor or adding a common mode inductor can alleviate the power-on problem. However, if a large capacitor is not used, whether the slow start method (capacitor + resistor and other circuits) can be used to alleviate the problem is still a question worth exploring. .
The specific manifestation of failure to start is that the fan rotates for a short time and then stops at the moment of startup. When the switch is slowly pressed, the rotation time will be longer than the normal time. It is not clear whether it is caused by the jitter of the mechanical switch or the incomplete electricity in the filter capacitor. Release leads to.
Continue to improve the circuit.
In addition: the stacking method of the two pads used is not standardized, which will increase the difficulty of processing. There is time to improve it. The previous version of using lithium battery to boost drive the ducted fan in
 
2022 has been successfully verified. This time, the power supply ground has been improved. Since I bought 1k less resistor, it has not been verified yet. Can drive 12V ducted fans.