Differential type charging detection system

Abstract

The invention discloses a differential type charging detection system. The system comprises a charging cell, a single chip microcomputer, a voltage acquisition module, a current acquisition module, a discharging module and a switch power supply. The positive electrode of the charging cell is connected with the positive electrode of the switch power supply. The negative electrode of the charging cell is successively serially connected with diode D1 and a resistor R5. The other end of the resistor R5 is connected with the negative electrode of the switch power supply and then is grounded. The single chip microcomputer is connected with the positive electrode of the charging cell through the voltage acquisition module, and is connected with the negative electrode of the diode D1 through the current acquisition module. The discharging module is arranged between the positive and negative electrodes of the charging cell and a connection wire of the switch power supply and is connected with the single chip microcomputer. According to the invention, different numbers of cell combinations and cell voltage of different materials of cell combinations can be detected; detection precision is high and errors are small; the circuit structure and devices of the system can be effectively protected; and use stability and safety are improved.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a voltage difference charging detection system for electric vehicles. Background technique [0002] With the development of society, electric bicycles have become the most popular transportation work for the public. Commonly used electric vehicle batteries are divided into lead-acid batteries, lithium batteries and so on. The battery charging process of an electric vehicle generally adopts a full-charge detection method. At present, the full-charge detection of electric vehicle chargers is mostly constant voltage detection and AD constant voltage detection. [0003] Constant voltage detection is mainly used in non-intelligent detection circuits without AD detection function. Since there is no AD voltage detection function, voltage can only be compared by a single op amp comparator. When the battery voltage reaches full voltage or is larger than the reference voltage in the op ...

AI Technical Summary

Problems solved by technology

In this way, in the process of large current change, due to the great change of the load rise and fall, it is easy to make the UC3842 overload after overload protection. After long-term large fluctuation work, it is easy to damage the chip, which is not conducive to the stability of UC3842 long-term use. and reliability

Images