Accurate Power Loss Model Derivation of a High-Current Dual Active Bridge Converter for an Automotive Application
Accurate Power Loss Model Derivation of a High-Current Dual Active Bridge Converter for an Automotive Application
复制标题
DOI：
10.1109/tie.2009.2025284
复制
发表时间：
2010-03
影响因子：
7.7
通讯作者：
F. Krismer;J. Kolar
中科院分区：
文献类型：
--
作者：
F. Krismer;J. Kolar
针对燃料电池轿车中为12V电池和高压直流母线提供双向电接口的高效双有源桥式变流器，推导了其精确的功率损耗模型。额定功率为2 kW，高压直流母线在240至450 V之间变化，电池电压范围在11至16 V之间。因此，在额定功率下，电池电流最高可达200 A。在汽车应用中，要求高转换效率和高功率密度。因此，有必要准确地预测每个功率部件的功耗，以便识别和正确设计变流器的重载部件。结合效率实测值，结果表明，传统的变流器分析对给定变流器的效率预测有很大的误差。本文描述了传统方法失败的主要原因，并记录了为更准确地预测网损所需的不同步骤。在较宽的输入输出电压范围内，当输出功率为2kW时，效率可达92%以上。
An accurate power loss model for a high-efficiency dual active bridge converter, which provides a bidirectional electrical interface between a 12-V battery and a high-voltage (HV) dc bus in a fuel cell car, is derived. The nominal power is 2 kW, the HV dc bus varies between 240 and 450 V, and the battery voltage range is between 11 and 16 V. Consequently, battery currents of up to 200 A occur at nominal power. In automotive applications, high converter efficiency and high power densities are required. Thus, it is necessary to accurately predict the dissipated power for each power component in order to identify and to properly design the heavily loaded parts of the converter. In combination with measured efficiency values, it is shown that conventional converter analysis predicts substantially inaccurate efficiencies for the given converter. This paper describes the main reasons why the conventional method fails and documents the different steps required to predict the power losses more accurately. With the presented converter prototype, an efficiency of more than 92% is achieved at an output power of 2 kW in a wide input/output voltage range.