Fast Charging Station Designed For Electric Bicycles

Electric bicycles are always using up all the electric energies on the halfway, In order to solve this problem, we designed a coin-operated unmanned electric vehicle fast charging stations. According to the experimental results, if the batteries are charged for ten minutes, the bicycles can travel five to ten kilometers, This charging station solved the electric car electricity embarrassing problem, it can have a large number of applications in the right street.The paper researched the principles of fast charging for lead-acid batteries in detail, we minimized the polarization effect of the battery in the case of charging speed guaranteed, the use of high current fast charging method for electric vehicle battery charging, normal charging time for 10 minutes, the total charge time is limited for 30 minutes, to ensure the safety of batteries. According to the battery voltage to adjust the charge current and the maximum charge voltage, according to the polarity of the battery charging power supply automatically adjusts the output polarity, to ensure that the charging station can charge for any electric bicycles. Through voice and LED display to ensure the use easily.The charging station power supply is fly-back topology, the output voltage range is DC24V-80V, the max power is 500W, design the switching transformer and the transformer primary absorption network in detail; Use the fixed frequency current-mode PWM controller to control the switching, use the op amp to achieve PI controller for the voltage loop and current loop feedback regulation , linear opto-coupler PC817 isolates feedback signals; Dual MCU architecture, two hardware systems are power hardware board and human-computer interaction board, they exchange the information through the UART. Low-cost controller with STM8 series MCU, the main role in power system is that it can sample supply voltage, current and temperature signals, to achieve protection of special conditions and charge process control, human-computer interaction system is used to display voltage and current information and playback voice.