Abstract
In the application of on-board chargers, LLC resonant converters need to work in multiple operating modes to achieve wide-range output requirements. For the most commonly used single-phase and three-phase LLC topologies, the time domain expressions of all possible operating modes are introduced to predict voltage and current behaviors. Based on the mode analysis, the 6-element boundary gain design method is proposed to design a wide gain range LLC resonant converter. The resonant current is used as the basis for ZVS judgment and the transformation trend of ZVS in the full operating range is given. Through reasonable distribution of the boost region and the buck region, the resonant devices can be designed more appropriately to achieve lower conduction loss and higher efficiency. Finally, the prototypes of 3.3kW and 6.6 kW are built to verify the theoretical analysis of the method in single-phase LLC and three-phase LLC.
Highlights
In the past ten years, electric vehicles (EVs) have been commercialized to reduce demand for fossil fuels [1]–[5]
According to the relationship of 6 elements related to the design, we provides a set of on-board charger (OBC) design procedure
EXPERIMENTAL RESULTS The proposed method is designed for LLC parameters and the results of single-phase and three-phase LLC are verified by prototype
Summary
In the past ten years, electric vehicles (EVs) have been commercialized to reduce demand for fossil fuels [1]–[5]. The output current ripple rate of singlephase LLC resonant converter is 156.7%. C. Shen et al.: Design Method of 6-Element Boundary Gain for LLC Resonant Converter of EV resonant parameters accurately. When the converter operates in a wide range of output voltage, the resonant current is not completely sinusoidal, which will cause a large errors. The mode analysis provides time domain expressions of voltage, current and DC gain at different resonant states. In [20], the resonant converter is designed to work under an expected operating mode. Under wide-range output applications, LLC resonant converter will definitely operate in the boost region under certain conditions. According to the different operating frequencies, we use time domain model to analysis to study the resonant states in single-phase LLC and threephase LLC.
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