Low Ripple Lithium Battery Charging and Discharging Realization Method

Abstract

The invention relates to a low-ripple-wave lithium battery charging and discharging achieving method. By means of the method, lithium batteries are charged and discharged by a two-way switch power source, a power circuit of the switch power source is a two-way half-bridge / synchronous current doubler rectifier two-way direct-current / direct-current inverter, and a control circuit adopts inductance charging charge control and adopts a double PI adjuster and a diode automatic selection circuit so as to achieve constant-current charging, constant-voltage charging and constant-current discharging on the lithium batteries and achieve automatic smooth switching from constant-current charging to constant-voltage charging states. By means of the low-ripple-wave lithium battery charging and discharging achieving method, charging and discharging on ultra low ripple waves of the lithium batteries can be achieved by using filtering total inductance current iL as the control object.

Description

technical field [0001] The invention relates to charging and discharging of batteries, in particular to a method for realizing charging and discharging of ultra-low ripple lithium batteries. Background technique [0002] With the development of new energy technology, lithium batteries are the main energy storage devices, which need to be activated and accurately charged and discharged. Low-power applications can use low-ripple linear current, the loss can be ignored, and the heat dissipation problem can be easily solved; due to the low efficiency of the linear power supply, the loss is large in high-power applications, the heat dissipation problem is not easy to solve, and the reliability is low, so high efficient switching power supply. However, the ripple of the switching power supply controlled by conventional PWM is relatively large, and it is difficult to meet the requirements of the ultra-low ripple output of the switching power supply for accurate testing of lithium ...

AI Technical Summary

Problems solved by technology

Low-power applications can use low-ripple linear current, the loss can be ignored, and the heat dissipation problem can be easily solved; due to the low efficiency of the linear power supply, the loss is large in high-power applications, the heat dissipation problem is not easy to solve, and the reliability is low, so high Efficient switching power supply

However, the ripple of the switching power supply controlled by conventional PWM is relatively large, and it is difficult to meet the requirements of the ultra-low ripple output of the switching power supply for accurate testing of lithium batteries.

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