| The intelligent charging technique is a subject which has been concerned widely in the industry of battery, and it is one of the key factors which affect the charging quality and battery life, the research of related technique has high practical value. This paper concentrates efforts on studying high-capacity intelligent charging technique for lead-acid batteries, mainly include the comparison and selection of the charging methods, the research of charging algorithm and the design of charging system.Based on the analysis of the fast charging theory and the investigation of many charging methods, a three-stage constant-current charging method with obverse-reverse-zero pulse was put forward. The theory and the tests indicated that by application of the charge strategy, the charging period was reduced largely and the charging efficiency was raised.Ground on the HF SPS (High-Frequency Switching Power Supply),the charging system was designed which was composed of a three-phase rectifying cell, a phase-shifted zero-voltage-switching PWM DC/DC full-bridge cell and a discharging depolarization cell. In the DC/DC cell, IGBT was selected as the switch that was driven by EXB841 module. The charging control system was based on AT89C52, phase shift and resonance PWM controller UC3875.Using this construction of power supply, switching loss was much reduced and higher frequency could be gained.The charging control technique of battery is the core technique of the intelligent charging system. Based on the analysis of many charge-termination control methods, an integrated control method of battery charging is proposed, which integrates voltage control, timing control and battery temperature control. Aiming at the characteristics of lead-acid battery, the paper designed a PDD controller of self-adaptive fuzzy based on self-adaptive fuzzy control theory, using it could perform advanced control algorithm and output control, and realize constant-current charging and the constant-voltage charging. |
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