Low-cost automatic charging and discharging control circuit and control method for storage batteries

Abstract

The invention relates to the technical field of storage battery charging and discharging control, in particular to a low-cost automatic charging and discharging control circuit and control method forstorage batteries. The low-cost automatic charging and discharging control circuit comprises a charging circuit of which one end is electrically connected with an external charging power supply and the other end is electrically connected with the conducting end of a diode. The cut-off end of the diode is electrically connected with the external charging power supply and a power output terminal. The low-cost automatic charging and discharging control circuit further comprises a storage battery of which one end is electrically connected with the conducting end of the diode and the other end is grounded. According to the low-cost automatic charging and discharging control circuit and control method for storage batteries disclosed by the invention, the automatic charging and discharging function of the storage battery is realized by making use of the switching characteristics of the diode, and there is no need for enabling control by an external controller. The circuit is simple, and the system instability of charging-discharging switching of the storage battery is overcome. The circuit has fewer components and occupies less PCB area, which is conducive to miniaturization and light weight. Moreover, the cost is greatly reduced, which is conducive to wide application.

Description

technical field [0001] The invention relates to the technical field of storage battery charging and discharging control, in particular to a low-cost automatic charging and discharging control circuit and control method for storage batteries. Background technique [0002] There are mainly two schemes for the existing storage battery charge and discharge control: one is to use a power management chip. The cost of this solution is high, and it needs to occupy the I / O port or bus of the MCU (vehicle controller), and the switching of charging and discharging of the battery needs to be actively controlled, so more peripheral circuits are required. The other is that the MCU controls the triode to enable charge and discharge management. In this solution, 5V direct charge is used for charging; when discharging, AD acquisition voltage is required to cooperate with charge and discharge management. When the voltage is lower than the threshold value, the enable is turned on to charge the...

AI Technical Summary

Problems solved by technology

This solution has extremely high requirements on the accuracy of AD acquisition. Due to the inevitable existence of errors and the various load conditions of the circuit, this solution is unstable, and it is easy to cause the control pin not to be turned on at the moment of power failure, resulting in a gap between the external charging power supply and the battery. Can't switch accurately

Since the voltage of the external charging power source is often higher than the external working voltage of the battery, if the switching is not timely or the switching fails, the external charging power supply will always supply power to the electrical devices, making the electrical devices in an overvoltage state for a long time, and there will be The risk of burning electrical components affects the service life of electrical components

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