Some basic name knowledge in PCBA board:

　　1. Three in one board

　　 three-in-one board is a kind of lithium battery protection in order to save costs.

　　Basic functions: over-discharge, over-charge, over-current, short-circuit, under-voltage because all functions are controlled by a single IC. So if this IC is broken, it may cause the PCBA board to lose control. That is, during the charging process, if the IC is broken, the line may still be connected. Without IC overcharge protection, the power supply will still be charged when it is fully charged. This will cause the battery to overcharge, heat the battery, and even cause serious damage. Burning or explosion of the battery.

What do you know about the basic names of PCBA boards?

　　2. With lithium battery protection board

　　PCBA with lithium battery protection is equivalent to double protection. Basic functions: over-discharge, over-charge, over-current, short-circuit, under-voltage, that is, when the large IC is broken, two small ICs can control the entire circuit. After the power supply is fully charged, the circuit will be disconnected to play a protective role. Avoid hurting people and greater losses.

　　3. Leftovers

　　 The so-called leftover material is the waste material discarded by the placement machine when mounting the PCB, or the waste material removed during the repair process, which is recycled and reused. Such electronic materials are not unified, and the accuracy of electronic materials is not the same. It may not reach the minimum required accuracy of itself, or abnormal operation of PCBA may occur. It may even cause leakage of the entire PCBA (that is, solder a charged battery, and leave it for one night or one day, and the entire battery will run out)

　　 4. Ordinary single section board

　　The input voltage is generally 5V, and the current is 1A (±200MAH)

　　The output voltage is generally 5V, and the current is 1A (±200MAH)

　　 1A input is equivalent to 1 hour to charge 1000MAH to the power supply

　　 The normal battery voltage is generally within 3.7~4.2V. After the PCBA's boost function, the output voltage of the power supply is 5V. In this case, the PCBA will heat up, and the power supply will heat slightly.