Simple and reliable battery overcharging protection circuit

Abstract

The invention disclose a simple and reliable battery overcharging protection circuit, which is characterized by comprising an MOS (Metal Oxide Semiconductor) transistor Q1, a silicon-controlled rectifier U1, resistors R1-R8, capacitors EC1 and C1 and a diode D1; the source electrode of the MOS transistor Q1 is connected with a battery voltage end VBAT; the resistor R1 is in a crossover connection between the source electrode and the grid electrode of the MOS transistor Q1; the grid electrode of the MOS transistor Q1 is connected with the cathode of the silicon-controlled rectifier U1 via the resistor R2, the drain electrode is connected with the output end Vout and connected with the gate electrode of the silicon-controlled rectifier U1 via the resistors R3 and R4; the resistors R5 and R7 and the capacitor C1 are connected in parallel and then are in a crossover connection between the gate electrode and the anode of the silicon-controlled rectifier U1; the battery voltage end VBAT is connected with the gate electrode of the silicon-controlled rectifier U1 via the resistor R6; and the external power end Vcc in is connected with the gate electrode of the silicon-controlled rectifier U1 via the resistor R8 and the diode D1. The simple and reliable battery overcharging protection circuit is capable of effectively solving the overcharging of the battery caused by reactive voltage and has the features of controlling load restarting, preventing the battery from being overcharged deeply and prolonging service life of the battery.

Description

Technical field: [0001] The invention relates to a simple and reliable battery over-discharge protection circuit, which is suitable for the protection of charging / discharging batteries of solar energy storage devices. The invention belongs to the technical field of switching power supplies and controllers in new energy systems. Background technique: [0002] Today, with the increasingly serious problems of energy depletion and environmental pollution, the development and utilization of new energy sources are getting more and more attention. Solar energy has been gradually developed and utilized due to its advantages of cleanness, environmental protection and rich reserves. Various solar energy systems have gradually entered people's lives. As important energy storage devices, rechargeable / dischargeable batteries have also been widely used, such as lead-acid batteries , lithium batteries, etc. This type of battery can be charged by solar energy, and then supply power to dif...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a simple and reliable battery over-discharge protection circuit in order to solve the problems of complex structure of the battery over-discharge protection circuit in the prior art and the untimely restart of the circuit

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