| Summary: | 碩士 === 大同大學 === 電機工程研究所 === 92 === The purpose of this thesis is to develop a step-down switching mode rectifier (SMR), which is used to reduce the whole system volume and achieve serial-parallel balance charging of the Li-ion battery arrays. The single phase step-down SMR connects with utility power and catch the synchronous signal of utility power to achieve synchronous control. By using LC filter to obtain a stable DC voltage, then charging serial-parallel Li-ion battery by DC/DC buck converter.
The battery charger is DC/DC buck converter. In serial charging mode, using low-dissipative circuit which parallels the battery can transfer excess energy from the higher voltage battery to the lower one to achieve balance charging. In parallel charging mode, utilizing the method of switching can maintain the equal charging current in each battery to avoid the different battery internal resistance which is caused unbalance charging. While the charging current in the system is over the battery limit, it can protect the security of the system by using the configuration of protection software-hardware properly.
Finally, a single-chip microprocessor 80196 is used in this system and an experimental hardware scheme with software algorithm is established to prove the proposed principle in expectation to attain low-dissipative energy of serial-parallel Li-ion battery balance charging system.
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