Transformation controller for charging and discharging lithium ion accumulator as well as transformation control method thereof

Abstract

The invention discloses a transform controller and a transform control method for the charging-discharging of a lithium-ion storage battery. The transform controller comprises an auxiliary power supply connected with a shutoff signal SD1 which is externally input, and a main circuit, wherein a storage battery end of the main circuit is connected with a drain electrode of a switch tube S1 and a source electrode of a switch tube S2 through a power inductor; a drain electrode of the switch tube S2 is connected with a bus end, and control electrodes of the switch tube S1 and the switch tube S2 are connected with the output of a driving circuit; the input of the driving circuit is connected with an output end of a driving signal PWM of a switching circuit; an input end of the switching circuit is respectively connected with an external switching control signal SD2, a charging feedback signal FB1 output by a constant current-to-constant voltage auxiliary circuit, a discharging feedback signal FB2 output by a discharging sampling unit of the bus end, and a normal phase driving signal PWMA output by a control circuit; the other output end of the switching circuit outputs a feedback signal FB to the control circuit; and an input end of the constant current-to-constant voltage auxiliary circuit is connected with a voltage sampling signal Vb and a current sampling signal Ib which are output by a charging sampling unit of the storage battery end.

Description

technical field [0001] The invention relates to an energy conversion and control device for charging and discharging lithium-ion battery packs in a microsatellite power supply system, a solar (wind energy) power generation system, a DC motor drive system, an uninterrupted power supply system, and an electric vehicle. Background technique [0002] The power supply system usually consists of solar battery packs, battery packs, DC / DC converters and shunts. In the traditional power supply system, the DC / DC converter consists of two parts: charging DC / DC and discharging DC / DC converter [ figure 1 (a)]. In the sunny area, the solar battery pack not only supplies power to the load, but also charges the battery through the charging DC / DC converter. In the shadow of the sun, the battery supplies power to the load through a discharging DC / DC converter. [0003] DC / DC converters can be divided into two categories: isolated type and non-isolated type. There are three typical non-isol...

AI Technical Summary

Problems solved by technology

[0004] In the traditional power supply system, due to the use of two sets of DC / DC converters for the charging and discharging conversion of the battery, the power supply system has a large volume, is difficult to reduce the weight, and has low work efficiency.

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