Power supply automatic switching circuit with battery undervoltage shutdown

Abstract

The invention belongs to the technical field of electronics, and relates to a power supply automatic switching circuit with battery undervoltage shutdown. The power supply automatic switching circuitis characterized by comprising an external power supply input end, an external power detection output control circuit, a power supply input interface, a battery low voltage detection output control circuit, a battery power supply on / off control circuit, and a load output end, wherein the external power supply input end is electrically connected with the external power detection output control circuit, the external power supply input end passes a Schottky diode D1 and then is connected with a load output, a battery power supply input end is electrically connected with the battery power supply on / off control circuit and the battery low voltage detection output control circuit separately, the low voltage detection output control circuit and the external power detection output control circuitare electrically connected with the battery power supply on / off control circuit separately, and the battery power supply on / off control circuit is connected to the load output end. The power supply automatic switching circuit improves the use ratio of battery energy, lowers battery loss, and prolongs the service life of batteries. The circuit has a simple structure and has low manufacture cost.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a power supply automatic switching circuit with battery undervoltage shutdown. Background technique [0002] Most of the existing industrial control equipment is powered by a single power supply, either only external power supply or battery power supply. When the external power supply is disconnected or the battery power supply is insufficient, the equipment will no longer work normally; in addition, the battery power is often over-discharged. It will seriously damage the electrical performance and cycle life of the battery. Therefore, an effective means is needed to prevent these problems. The traditional solution is to use two Schottky diodes for isolation. Although this circuit scheme is simple and low in cost, the Schottky diode itself has voltage loss. , leading to the problem of low battery power utilization; there is also a plan to use a Schottky diode and...

AI Technical Summary

Problems solved by technology

[0003] To this end, it is necessary to provide a circuit that overcomes the technical problems of voltage loss, battery damage, and even explosion caused by the isolation circuit in the prior art, and at the same time achieves a power-off protection function for battery undervoltage

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