| Summary: | 碩士 === 國立交通大學 === 電機學院電機與控制學程 === 102 === Electronic devices in all kinds of fields have been requested to run after perfection in terms of every aspect in recently. Nowadays, most of household appliances and portable devices in use are directly connected to the supply via plugs and sockets to get activated or to charge its built-in battery. With the rapid growth in the consumer electronics, rechargeable mobile battery bank has proved to be the most compatible for portable devices. The proposed open-loop regulator is a high efficiency and low cost solution for power applications, and it is also a high input voltage isolated charger compatible with AC supply. However, the biggest difference between the proposed and general regulators is that the proposed has no direct feedback loop to obtain output information. Hence, it’s a major challenge to precisely detect the battery voltage from auxiliary winding, and thus to accurately control the entire system.
This proposed open-loop regulator charger excludes non-ideal effects from the practical battery. Besides, the proposed technique detects battery voltage precisely without any feedback network and has all control paths stabilized and switched smoothly under constant voltage and constant current modes. Valley switching and dynamic frequency switching are both set and applied in the constant voltage mode in order to pursue high efficiency and performance.
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