How to solve the crash when the single chip computer is powered on

chrisqi

Increase the isolation to improve the quality of the power supply.

mars1004

I have done relay control before, but the circuit was burned out because of inexperience. The following are some of my experiences.
1. Isolation is best, high-power circuits are independent of low-power circuits, and optical isolation between interfaces. It is also best to have two sets of power supplies, one set of high-power circuit and one set of single-chip (low-power) circuit.
2. Make a stable reset circuit. It is best to use off-the-shelf chips. The reliability of generating reset signal with resistance-capacitance is not high.
3. The wiring should be thick and reasonable during PCB layout. Use large area shielding.
4. The relay needs to use high-power diodes to absorb the reverse instantaneous high voltage. The specific circuit can be searched online.
5. If the cost permits, you can replace the car-specific single-chip microcomputer, which is extremely reliable.

Colin

Try it. The relay coil is connected in parallel with a diode and the contacts are connected in parallel with RC for spark suppression.

cwyhezjd

0.0 Is the power supply capacitor added?

iself

Delay reset, the power supply needs to be checked to see if it is stable.

jz0701

设置一下看门狗