A Topology Structure and Control Method of Composition and Capacitance Power Supply

Abstract

The invention relates to the field of power electronic system control, in particular to a topological structure and a control method of a power supply for composition and capacity. The present invention is a topological structure of a power supply for composing and dividing capacity, including a three-phase AC / DC rectifier, an LLC resonant converter, and a voltage stabilizing capacitor C on the output side of the three-phase AC / DC rectifier. d In parallel with the LLC resonant converter, the voltage stabilizing capacitor C on the output side of the LLC resonant converter 0 Connected in parallel with the load battery E, the LLC resonant converter has bidirectional energy flow and automatic switching, and has the characteristics of constant voltage gain when the switching frequency is not higher than the resonant frequency; The output voltage of the resonant converter V 0 It is the outer loop, and the input current of the three-phase AC / DC rectifier is the inner loop; it realizes bidirectional flow of energy and automatic switching.

Description

technical field [0001] The invention relates to the technical field of power electronic system control, in particular to a topological structure and a control method of a power supply for composition and capacity. Background technique [0002] Composition and capacity is the last very important process before the battery leaves the factory, that is, through a series of charging and discharging of the battery, the electrochemical performance of the active material in the battery is improved and strengthened. Compared with foreign chemical composition and capacity equipment, most of the chemical formation equipment currently on the market has a relatively single formation function, and there are only three simple methods: constant current charging, constant voltage charging, and constant current discharging. The composition capacity power supply is an AC input, DC output (AC / DC) device. Most of the traditional chemical conversion power supply devices have one-way power flow, ...

AI Technical Summary

Problems solved by technology

In order to prevent frequent switching of the energy flow direction, it is often necessary to set a dead zone, which will cause large fluctuations in the output voltage when the energy flow direction is switched, and prolong the transient adjustment time of the system

In addition, since the composition capacitor is usually used in low-voltage and high-current occasions, the selected device has a low withstand voltage level, so the maximum allowable value of the output voltage is low, and the threshold value of the set voltage dead zone is very low, which will make the switching of energy flow difficult in practice. The control algorithm is very complicated when implemented, and if the energy flow direction switching fails, it will cause a sudden change in the output voltage, and may even exceed the maximum allowable value, resulting in serious consequences such as damage to the power supply.

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