Logic control circuit for 0v battery charging, battery protection chip and circuit

Abstract

The embodiment of the invention relates to a logic control circuit for charging a 0V battery, a battery protection chip and a circuit. The logic control circuit comprises a withstand voltage protection module, a charging control potential locking module and a potential translation module. The potential of the charge / discharge detection signal input terminal CS is raised to the required potential through the withstand voltage protection module, and the output terminal CS1 of the withstand voltage protection module is supplied to the charge control potential locking and potential translation module; The charging control potential locking module in the charging control potential locking and potential translation module fixes the potential of the gate control terminal OC of the charging control transistor in the battery protection circuit to the potential of the positive input terminal VDD of the power supply after the 0V battery is connected to the charger; The potential translation module converts the input signal with the high / low level VDD / 0 V to the output signal with the high / low level VDD / CS1 to control the on and off of the transistor for charge control. The voltage shift module converts the input signal with the high / low level VDD / 0 V to the output signal with the high / low level VDD / CS1 to control the on and off of the transistor.

Description

technical field [0001] The invention relates to the technical field of battery charging, in particular to a logic control circuit, a battery protection chip and a circuit for 0V battery charging. Background technique [0002] How to realize the 0V charging function in application fields such as lithium battery protection has become one of the keys to the current design. 0V charging refers to recharging a battery that has self-discharged to 0V with the permission of the lithium battery. A lot of research has been done on the technology of 0V charging in the industry. The current implementation methods include the following two methods: one is to use depletion devices and thick gate oxide devices to realize, and the other is to use thick gate oxide devices to realize. [0003] figure 1 A schematic diagram of a circuit for 0V charging using a depletion device and a thick gate oxide device. [0004] N1 in the figure is a depletion device, where VDD is the positive input termi...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a logic control circuit, battery protection chip and circuit for 0V battery charging, solve the problem of device withstand voltage by adding a withstand voltage protection module, and realize battery protection through charging control potential locking and potential translation modules The potential of the gate control terminal OC of the charging control transistor in the circuit is fixed at the potential of the positive input terminal VDD of the power supply, and the input signal with a high / low level of VDD / 0V is converted into a high / low level of VDD / CS1 The output signal to realize the turn-on and turn-off logic of the charge control transistor

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