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Working principle of lithium-ion battery protection circuit

This circuit has functions such as overcharge maintenance, over discharge maintenance, over current maintenance, and short circuit maintenance. The working principle analysis is as follows:

1. Normal state

Under normal circumstances, the CO and DO pins of N1 both output high voltage in the circuit, and the mosfet is in a conductive state. Batteries can be freely charged and discharged because the conduction impedance of MOSFETs is very small, usually less than 30 milliohms, so its conduction resistance has little impact on the functionality of the circuit. In this case, the consumption current of the repair circuit is Class A, generally less than 7kvA.

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