| Summary: | 碩士 === 崑山科技大學 === 電機工程研究所 === 97 === Resonant power conversion technology offers many advantages in comparison with traditional PWM one. Among them are low electromagnetic interference, low switching losses, small volume and light weight of components due to high switching frequency, high efficiency, and low reverse-recovery losses in diodes because of low di/dt at turn-off instant. In this thesis, a novel loaded resonant converter for battery energy storage applications is presented. This new topology consists of a half-bridge LCL resonant inverter and a bridge rectifier. The output stage of the novel loaded resonant converter is rectified by the resonant tank.
There are two conduction modes of operation for the novel loaded resonant converter, continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In CCM operation, the switching frequency is greater than half of the resonant frequency. In DCM condition, it occurs when the operation of the novel loaded resonant converter below half of the resonant frequency. The novel loaded resonant converter operating at either CCM or DCM is analyzed in detail. A prototype charger circuit with the novel loaded resonant converter designed for a 12V-12Ah battery is built and tested to verify the analytical predictions. Experimental results demonstrate that the charging current can be controlled well by regulating the switching frequency of the novel loaded resonant converter. Satisfactory performance is obtained from the experimental test results.
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