Neuro-fuzzy stability control system and control method for electric vehicle charger

Abstract

The invention relates to a neuro-fuzzy stability control system and a control method of an electric vehicle charger. Compared with a traditional full-bridge DC-DC conversion circuit, the phase-shifting full-bridge ZVS DC-DC conversion technology adds a resonant inductance to the circuit The resonant capacitor element uses the resonance of the resonant inductor and capacitor to make the four power switch tubes of the full-bridge circuit work in the soft switching state of zero-voltage on and off, thereby solving the problem of high-frequency switching power loss and improving the efficiency of electric energy conversion . Neuro-fuzzy PID control technology combines neural network control with fuzzy PID control, which has better robustness against circuit parameter fluctuations and can adapt to the time-varying nonlinear characteristics of objects. By adopting these two technologies, the overshoot and volatility of the output voltage of the circuit can be reduced, the response rate of the circuit can be accelerated, external interference can be suppressed, and the stability of the circuit can be improved.

Description

technical field [0001] The invention relates to improving the electric energy conversion efficiency and output voltage stability of an electric vehicle battery charger during charging, in particular to a neuro-fuzzy stability control system and a control method for an electric vehicle charger. Background technique [0002] During the development of electric vehicles, the power supply capacity of electric vehicle battery packs greatly restricts the development of electric vehicles. It can be said that the power supply level of batteries largely determines the performance of electric vehicles. It is very important to seek an efficient, stable, fast and safe charging technology for charging the power supply battery pack to improve the performance of electric vehicles in an all-round way. The commonly used electric vehicle battery charging technology uses controllable rectification technology, such as BUCK-BOOST circuit, half-bridge / full-bridge DC conversion circuit, isolated fo...

AI Technical Summary

Problems solved by technology

However, this type of circuit has high harmonic content, low power factor, and low efficiency and stability of electric energy conversion during charging.

The power conversion efficiency of the charger is not high, so that a considerable part of the electric energy is not fully utilized; the charging voltage output by the charger is unstable, resulting in uneven charging voltage of the battery pack, and the battery pack will be scrapped in advance if it is in this charging environment for a long time, which is not conducive to prolonging the life of the battery pack. battery life, resulting in waste of resources

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