Neural fuzzy stability control system of electric automobile charger and control method

Abstract

The invention relates to a neural fuzzy stability control system of an electric automobile charger and a control method. Compared with a traditional full-bridge type DC-DC conversion circuit, a phase-shifted full-bridge ZVS DC-DC conversion technique adds a resonance inductor and a resonance capacitor element to a circuit, resonance of the resonance inductor and a capacitor is used, four power switch tubes of a full-bridge circuit work in a zero-voltage turn-on and turn-off soft switching state, so that the problem of high-frequency switching power consumption is solved, and electric energy conversion efficiency is improved. A neural fuzzy PID control technique combines neural network control and fuzzy PID control, robustness is good according to fluctuation of circuit parameters, and meanwhile, adaption to the characteristic of object time varying nonlinearity can be achieved. By the adoption of the two techniques, the overshoot and fluctuation of circuit output voltage can be reduced, the circuit response rate is increased, external disturbance is restrained, and circuit stability is 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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