Research And Design Of DC Charging Piles For Electric Bicycles In Residential Quarters

In recent years,electric bicycles have become more and more popular in people's lives because of their convenience,environmental protection,and economic advantages.As a shortdistance vehicle,electric bicycles have the advantages of low pollution,zero emission,low noise,high energy efficiency,simple maintenance at a later stage,and low cost.Compared to conventional fuel-powered bicycles,the electric energy used by electric bicycles is a clean secondary energy source.It not only has a wide range of sources,but also can effectively alleviate the increasingly severe energy and environmental conflicts.It is an important component of the implementation of the national grid advocates for the replacement of electrical energy.section.As a weak link of an electric bicycle,a battery has a direct impact on the life of its associated charging device.At present,the chargers on the market are mostly fast charging stations on the road and personal portable chargers.Due to design defects,these charging devices cannot achieve the best charging effect of the battery,and are likely to cause damage to the battery to reduce its life.This article designed a smart,unattended electric bicycle vehicle DC charging pile for residential quarters.By designing a charging strategy,it can avoid the damage caused by fast charging to the battery,and at the same time,it can improve the charging efficiency as much as possible and extend the battery.Lifespan saves energy use.First,the dissertation briefly discusses the research background,purpose and significance of the research.For the internal chemical reaction of the battery,charge and discharge characteristics and temperature characteristics were introduced.The traditional charging strategy is compared and the adaptive charging strategy used in this paper is improved on this basis.Secondly,the primary circuit of the primary charging circuit is designed,including full-bridge rectifier circuit,flyback DC-DC converter circuit and filter circuit.At the same time,the calculation and selection of device parameters in each circuit are given.The secondary circuits used for charging piles,namely power tube drive circuit,voltage measurement circuit,auxiliary power supply circuit,STM32 microcontroller control circuit,smart card module circuit to realize charging function,and power measurement module circuit were also studied and designed.Again,the software for implementing the charging pile system was written,and the system was connected into a whole by STM32 single-chip microcomputer,including the main program,charging subroutines,and charging subroutines.Finally,according to the design,the feasibility of the experimental platform to verify the scheme is established.The experimental results meet the design requirements.The comparison with the traditional charger proves that the designed charger meets the expected goal.