为了满足低压电池储能系统对变换器高效高密度的需求，构建了第一版以低压低NFoM (Rdson*Cotr)Si器件为开关管的元胞化RDCX样机，在额定点(Vbat=48V)工作时满载效率为97.9%。为进一步提高变换器额定点满载效率至98.5%，通过并联绕组和器件(降低电阻R)、同时使用具有相同Rdson但NFoM值更小的低压GaN器件(降低电容C)，不仅器件上的导通损耗和绕组的直流损耗可以降低，而且绕组的交流损耗也有所下降。经实验验证，当前第二版样机的DCX部分满载效率相比第一版样机有较大提升。具体为：额定点48V输入时，满载效率为98.7%，提高了0.6%；40V输入时，满载效率为98.5%，提高了0.6%；60V输入时，满载效率为98.7%，提高了0.5%。
In order to meet the requirements of low-voltage battery energy storage system for high efficiency and high density of converters, the 1st generation of cellular RDCX prototype with low-voltage and low-NFoM (Rdson*Cotr) Si device as switches was constructed, and the full-load efficiency was 97.9% when at the rated point (Vbat=48V).
For further increasing the full-load efficiency of the converter at rated point to 98.5%, the conduction loss on the device and the DC loss of the winding can be reduced, and the AC loss of the winding can also be reduced by connecting the winding and the device in parallel (Less R) and using low-voltage GaN device with the same Rdson but with smaller NFoM (Less C). Experiments have verified that the full-load efficiency of the DCX part of 2nd generation prototype is greatly improved compared with 1st generation prototype. Specifically, when the rated point is 48V input, the full-load efficiency is 98.7%, which is increased by 0.6%; At 40V input, the full-load efficiency is 98.5%, an increase of 0.6%; At 60V input, the full-load efficiency is 98.7%, an increase of 0.5%.
- 输入电压范围: 40Vdc-60Vdc（48Vdc rated）
- 输出电压范围: 320Vdc-420Vdc
- 满载效率: 98.5%@40Vdc；98.7%@48Vdc；98.7%@48Vdc (DCX Part)
- Input voltage Range: 40Vdc-60Vdc
- Output Voltage Range: 320Vdc-420Vdc
- Full Load Efficiency: 98.5%@40Vdc; 98.7%@48Vdc; 98.7%@48Vdc (DCX Part)
Fig. 1 Topology of Cellular RDCX.
Fig. 2 Prototype of 2nd Generation Prototype
Fig. 3 Efficiency Test of DCX Part
往期相关成果：用于储能系统的高效高密度隔离双向变换器（2023年11月）
