System and method for abnormal detection of output voltage feedback of battery charging device

Abstract

The invention discloses a system and method for abnormal detection of output voltage feedback of a storage battery charging device, comprising: a single-chip microcomputer; a first voltage comparison circuit, the voltage sampling circuit of which is connected to the output end of the charger, and the output end is connected to the single-chip microcomputer for monitoring The output voltage of the charger, and the logic signal obtained after comparison is sent to the single-chip microcomputer; the input terminal of the voltage feedback sampling resistor circuit is connected to the output terminal of the charger, and the output terminal is connected to the single-chip microcomputer through a voltage signal conditioning amplifier for real-time detection of the charger. The output voltage is to transmit the voltage signal processed by the voltage signal conditioning amplifier to the single-chip microcomputer; the single-chip microcomputer judges whether the output voltage feedback of the charger is normal and controls the action of the charger according to the received logic signal and voltage signal; the hardware circuit of the system is more concise, It is simpler and cheaper, can provide more timely, reliable and effective protection, can predict the occurrence of overcharge and find the problem of low voltage in voltage feedback faults.

Description

Technical field [0001] The invention relates to the application of single-chip microcomputer and electronic measurement, control and protection technology in the field of power supply, and in particular to a system and method for detecting abnormality of output voltage feedback of a battery charging device. Background technique [0002] As we all know, at this stage, batteries are widely used in traditional back-up power equipment and electric vehicles and other new energy fields; and batteries are expensive parts, such as electric vehicles. The battery component costs about 50% of the cost of electric vehicles, so how to ensure the battery The reliable use of groups is very important. [0003] The battery needs to be charged after it is discharged, and whether it is properly charged has an absolute impact on the life of the battery. Most of the early failures of the battery pack are caused by improper charging. Nowadays, most battery charging uses constant current and then consta...

AI Technical Summary

Problems solved by technology

[0008] One is the protection point set by the hardware, and the protection point is set slightly higher than the highest voltage that the charger can work. This technology has three disadvantages: 1. Because the charging voltage of many batteries varies with the charging state or temperature Therefore, the protection point of this technology is fixed at the highest possible working voltage of the charger, otherwise it will cause false protection during normal operation, and the battery pack is often when the output voltage of the charger is higher than the charging curve. When the constant voltage point is lower than this protection point, overcharge has already been formed, so this makes the protection point higher than the actual application requirements, and there are problems of untimely protection and poor effectiveness; 2. Only overvoltage can be detected. The undervoltage situation cannot be detected, so the problem of low voltage and undercharging cannot be solved; 3. The battery packs with different nominal voltages need to be configured with different hardware, and the hardware is different, which is not conducive to standardized production

[0009] The second technology is similar to the first technology, but its protection point is not set by hardware but can be adjusted by software, so it solves the problem of the first technology that is not conducive to standardized production, but other problems still exist

In addition, the voltage feedback abnormality may be caused by the abnormality of the sampling feedback resistor network, or the abnormality of the reference voltage of the feedback circuit. Therefore, the above two technologies need to detect the situation of the feedback resistor network and the reference voltage at the same time, so the circuit will be relatively complicated.

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