Positive and negative pulse charging converter for storage battery

Abstract

The invention discloses a positive and negative pulse charging converter for a storage battery. A bilateral full-bridge LLC (Logical Link Control) resonant circuit is taken as a main charging topology, so that the defect that the implementation of negative pulses is limited by application occasions and power levels is overcome while soft switching is realized. Meanwhile, a power main circuit comprises a bridge type uncontrollable rectifying circuit and a bilateral full-bridge LLC resonant circuit. During discharging of the storage battery, the bus capacitive voltage on a high-voltage side, namely, a rectifying side is raised. During initial charging at a positive pulse charging stage, open-loop control is adopted, namely, the duty ratios and frequencies of switching tubes Q1-Q4 are kept the same as the duty ratios and frequencies in a previous charging period. Since the bus capacitive voltage is high, the charging current is increased correspondingly and decreased gradually till a charging controller works normally, and the charging current is stable. In this way, sharp pulse charging current is formed in order to enhance the repair, namely, depolarization effect of the storage battery. Moreover, both the charging current and discharging current of the storage battery are under high-frequency pulsation, and an LC filter filters higher harmonics of the charging current while smoothening the high-frequency pulsation.

Description

technical field [0001] The invention belongs to the technical field of battery charging, and more specifically relates to a battery positive and negative pulse charging converter. Background technique [0002] Positive and negative pulse charging is a fast battery charging method, the use of this method helps to increase the charging speed of the battery. [0003] Such as figure 1 As shown, the characteristic of positive and negative pulse charging is that each charging cycle includes four stages a, b, c, and d, where a is the positive pulse charging stage, b is the intermittent stage of stopping charging, c is the negative pulse discharging stage, d Intermittent stage of stopping discharge. A positive pulse means charging the battery, and a negative pulse means discharging the battery. [0004] Positive and negative pulse charging requires that the corresponding charging topologies (circuits) have the functions of charging and discharging. In the prior art, charging topo...

AI Technical Summary

Problems solved by technology

[0004] Positive and negative pulse charging requires that the corresponding charging topologies (circuits) have the functions of charging and discharging. In the prior art, charging topologies such as bidirectional Buck / Boost, bidirectional phase shifting full bridge, and unidirectional phase shifting full bridge + flyback are commonly used. These Either the charging topology cannot realize soft switching, or the realization of negative pulse is limited by the application and power level

[0005] In addition, the repair and depolarization effect of the battery needs to be strengthened

Images