Charging protection circuit, charging protection system, charging protection method, charger and interphone

Abstract

The invention relates to a charging protection circuit, a charging protection system, a charging protection method, a charger and an interphone. The charging protection circuit comprises a diode D1, capacitors C1-C2, an SCR (silicon controlled rectifier), a resistor R1, a first DC (direct current) / DC converter and an overvoltage detection unit. A cathode of the diode D1 is connected with an anode circuit, an anode of the diode D1 is connected with a cathode circuit, and the capacitor C1 is in parallel connection with the diode D1. An anode of the SCR is connected with the cathode of the diode D1, a cathode of the SCR is connected with the anode of the diode D1, and a control electrode of the SCR is connected with a signal output end of the overvoltage detection unit through the resistor R1. The first DC / DC converter is connected with the SCR, and two ends of the capacitor C1 are connected with an anode output end and a cathode output end of the first DC / DC converter respectively. A detection end of the overvoltage detection unit is connected with the anode output end of the first DC / DC converter. Compared with the prior art, the charging protection circuit has the advantages that due to multi-level protection measures, overvoltage protection and overcurrent protection in a charging process are realized, and accordingly risks are reduced, and personal safety and equipment safety are guaranteed.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a charging protection circuit, a charging protection system and method, a charger and an interphone. Background technique [0002] With the continuous advancement of technology in modern society and the rapid development of electronic communication products, many electronic products use rechargeable lithium batteries as the main energy source. Lithium battery chargers of many products and equipment cannot charge lithium batteries very well and safely, which often causes overcharging of lithium batteries and damages the life of the battery and affects its power supply function. The author designed a smart lithium battery charger The device realizes the high-precision control of the charging voltage and current of the lithium battery. [0003] At present, the charging methods of professional communication handheld terminals are mainly power adapter + linear charger or DC / DC char...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to solve the problem of battery fire and explosion caused by wrong connection of power supply and reverse connection, and provide a multi-level protection measure to protect the charging process from overvoltage and overcurrent, reduce risks and protect the safety of human body and equipment

Images