Abstract
In this paper, a novel resonant circuit topology is proposed for battery charging applications. Compared with traditional implemented circuits, the proposed topology can provide constant current (CC) and constant voltage (CV) charging profiles for different battery states automatically. Specially, zero-voltage-switching (ZVS) turned on of switching devices can be realized at fixed operating frequency for different charging levels, which benefits the transferring efficiency and reduces the voltage stress of the switches. In addition, simple design methodology can be derived to improve system’s practicality and reliability, avoiding complex control strategy. Experimental results obtained from a 200 W prototype system show good agreement with calculated results, validating that the proposed topology can be used for battery charging systems.
Highlights
In recent years, renewable energy and resource has attracted increased interest all over the world
The constant voltage (CV) charging value should be predetermined according to the battery cell upper voltage limit, which is known as the float level during the CV mode
As evident from the results, the efficiency changes slightly for CV charging state, while the efficiency increases for constant current (CC) charging state because the losses of diodes account for a larger proportion for low voltage and high current charging state
Summary
Renewable energy and resource has attracted increased interest all over the world. Control schemes for high-frequency DC-DC converters can regulate phase shift or operating frequency to adjust charging current/voltage at various load resistance [13], [14], VOLUME 8, 2020
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