Battery protection circuit board

Abstract

The invention discloses a battery protection circuit board, which comprises a control chip, wherein a control transistor is integrated in the control chip, and the control transistor is connected between a second voltage end and a third voltage end; the battery protection circuit board further comprises a substrate voltage selection circuit and a gate voltage control circuit; the substrate voltageselection circuit is electrically connected with the substrate end of the control transistor and is used for outputting the lowest voltage of the system to the substrate end of the control transistor; and the gate voltage control circuit is used for generating gate voltage for controlling a conduction state of the control transistor, the control transistor is used for conducting or turning off according to the gate voltage, and the battery protection circuit board is used for charging or discharging a battery when the control transistor is conducted. According to the battery protection circuit board of the invention, charging or discharging of the battery is realized through the control transistor integrated on the control chip, the area of the circuit board is reduced, and the productioncost is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of integrated circuits, and in particular to a battery protection circuit board. Background technique [0002] With the development of integrated circuit technology, the integration of circuit boards is getting higher and higher. [0003] The traditional battery protection circuit board adopts the form of control chip + external MOS tube. The battery voltage is detected by the control chip, and the conduction state of the external MOS tube is controlled according to the battery voltage to control the charge and discharge state of the battery. [0004] However, the structure of placing the MOS tube outside the control chip makes the battery protection circuit board area larger, and in the prior art, two MOS tubes need to be placed outside to realize the control of battery charge and discharge, further increasing the battery protection circuit. board area, and the cost increases. Conte...

AI Technical Summary

Problems solved by technology

[0004] However, the structure of placing the MOS tube outside the control chip makes the battery protection circuit board area larger, and in the prior art, two MOS tubes need to be placed outside to realize the control of battery charge and discharge, further increasing the battery protection circuit. board area, and the cost increases

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