Abstract
In this study, an adaptive driving method for synchronous rectification in bidirectional full-bridge LLC resonant converters used in railway applications is proposed. The drain to source voltage of the synchronous rectifier is utilized to detect the conduction of the body diode, and a suitable driving signal for synchronous rectification is generated accordingly. The proposed driving scheme is simple and can be realized using a low-cost digital signal processor (DSP). According to the experimental results, which averaged 0.4625% and 1.097%, improvement can be observed under charging and discharging mode, respectively.
Highlights
The Type-4 fullbridge LLC resonant converter is regarded as a series–parallel resonance tank circuit with a bandpass filter, whereas the Type-11 full-bridge LLC resonant converter is regarded as a series–parallel resonance circuit developed based on an LS –CS series resonance converter
A 60 W bidirectional full-bridge LLC resonant converter with synchronous rectification was designed with an input voltage of 24 V and an output voltage of 12 V
This study firstly introduced the design of the bidirectional full-bridge LLC resonant converter and the challenges it faced
Summary
Full-Bridge LLC Resonant Converter.Owing to the continuous development and progress of society in recent years, the demand for electricity conversion has increased. The awareness of the limited earth resources has risen in recent years, awakening the consciousness of being environmentally friendly, as well as saving energy and reducing carbon dioxide emission, such as by trying to exert the energy most efficiently within the limited resources; a well-designed power system can be regarded as an essential way to save energy. Since the public’s requirements for power efficiency has never been higher, compared with linear power converters, switching power converters have an edge in high efficiency; because power switches only work in the on and off states, it has less loss and heat. The operating frequency of the switching power converter can be enhanced, reaching the requirement of being thinner and smaller, as well as having high-efficiency density
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