1. Physical protection
Use xt60, xt30 and other interfaces with different positive and negative interfaces, the most effective way to prevent reverse connection.
2. Using Schottky, rectifier diodes
Diodes have voltage drop, wasteful, not suitable for low power consumption , but the easiest way.
Recommended model:
3. Use nmos, pmos
pmos : pmos is recommended
nmos：
Selection attention
Input voltage Vin<Vgs*80%, 80% of the actual situation is considered
Power consumption p=i2*Rds select Rds small
mos tube protection
Connect a Zener diode between the GS poles
G pole plus current limiting resistor
4. Zener diode + resettable fuse
5. Pmos and pnp transistors form an ideal diode (the scheme used in the Raspberry Pi)
no pressure drop
ICs such as the ltc4357 for ideal diodes can also be used
6. Tips
Since the efficiency of ldo is inherently low, if ldo is used in the power supply scheme of low power consumption occasions, the diode scheme can be used directly for anti-reverse connection, and it is meaningless to use other schemes.
In addition, there are also some lod chips with anti-reverse connection.