Compatible Control Circuitry for Battery Charge Protection, Channel Switching, and Linear Power Management

Abstract

The invention discloses a control circuit with compatibility of battery charging protection, channel switching and linear power supply management. The control circuit comprises a controller, a lithium battery charging protection unit, a multipath temperature sensor switching unit and a multipath linear power supply management control unit. The lithium battery charging protection unit comprises a first switching tube, a fourth triode, a second resistor, a seventh resistor and a lithium battery charging chip. The base electrode of the fourth triode is connected with the controller through the seventh resistor, and the collection electrode is connected with one end of the second resistor and the first pin of the first switching tube. The other end of the second resistor is connected with a voltage input end and the third pin of the first switching tube. The second pin of the first switching tube is connected with one pin of the lithium battery charging chip. The other pin of the lithium battery charging chip is connected with the positive electrode of a lithium battery. Safe disconnection of the lithium battery after fully charging can be realized so that safety and controllability of lithium battery charging can be enhanced, the occupation number of the I / O ports of the controller can be reduced and controllability and stability of linear power supplies can be enhanced.

Description

technical field [0001] The invention relates to the field of control circuits, in particular to a control circuit compatible with battery charging protection, channel switching and linear power management. Background technique [0002] The traditional lithium battery charging circuit is widely used, and has the characteristics of simple circuit structure and few peripheral devices. Insecurity. In addition, the cost of traditional power management chips is high, the circuit flexibility is low, the controllability is low, and the ripple is large, and the traditional temperature sensor is directly connected to the controller. Under the circumstances, there will be a situation where the I / O port is not enough. Contents of the invention [0003] The technical problem to be solved by the present invention is that, aiming at the above-mentioned defects of the prior art, it provides a method that can realize the safe shutdown of the lithium battery after it is fully charged, imp...

AI Technical Summary

Problems solved by technology

[0002] The traditional lithium battery charging circuit is widely used, and has the characteristics of simple circuit structure and few peripheral devices. Insecurity

In addition, the cost of traditional power management chips is high, the circuit flexibility is low, the controllability is low, and the ripple is large, and the traditional temperature sensor is directly connected to the controller. In some cases, there will be insufficient I / O ports

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