Research Of The Electric Bicycle Charging Device

In the nowadays, as the energy depletion and the environment pollution becoming more and more severely, the low-carbon economy has become the main-stream of the world economy, as well as china’s economy. As a kind of clean energy transport, electric bicycles have gain much usage in China and China has already become the biggest producer and market of electric bicycles. Electric bicycles use batteries as the power source, so the charging device which is to charge the batteries is also an important part of the electric bicycles. Nowadays, most of the chargers in the market are portable chargers, but this paper is about the study of charging piles.Charging piles are easy to manage centrally and systematically the electric bicycles batteries and they are beneficial for the maintenance of batteries and energy saving. According to these advantages, this paper will demonstrate a design of an electric bicycle charger, which is able to charge two different voltage lead-acid batteries.First of all, this paper will analyze basic chemical and electrical characteristics of VRLAs, including charging and discharging chemical mechanisms, oxygen recombination cycle mechanism, polarization phenomenon, etc. Some commonly used charging methods will be demonstrated and another charging method based on them will be presented. Secondly, this paper includes the hardware design of the charger. Voltage from the electric network will be converted to two different charging voltages by a flyback converter and a buck converter. The controller adjusts the PWM output from the AVR MCU to turn on and turn off the power MOSFET, in order to control the charging process of the lead-acid battery. Thirdly, the software design of the charger will be demonstrated to realize the charging scheme. Finally, this paper will demonstrate the experiment device of the design and the final debug results. The experimental results show that the system can get out two different charging voltages stably and the PWM output control waveform is well.In this paper, there are35figures,0tables and26references.