基于递推最小二乘法与核密度估计的同步整流Boost变换器回流功率抑制

Backflow power suppression of synchronous Boost converter based on recursive least squares and kernel density estimation method

为了提高同步整流Boost变换器空载、轻载的工作效率,针对同步整流Boost变换器空载、轻载时存在的功率回流问题,分析该状态下电路的工作波形与工作特性.根据电路工作特性,提出能够准确识别功率回流状态并关断同步整流开关管的功率回流抑制策略.为了保证策略的精度与效率的优化,引入递推最小二乘法(RLS)和核密度估计(KDE),减少了电感误差和采样误差对策略精度的影响.搭建1 kV·A航空静止变流器仿真和实验平台进行验证.仿真和实验结果表明,该控制策略对功率回流的识别精度高,能够显著抑制回流功率,提高了电路空载和轻载效率.

The problem of backflow power of synchronous rectifier Boost converter under no load and light load was analyzed in order to improve the efficiency of no-load and light-load synchronous rectifier Boost converter.A backflow power suppression strategy which can accurately identify the power backflow state and turn off the synchronous MOSFET rectification transistor was proposed according to the waveforms and working characteristics of the circuit.Recursive least squares(RLS)and kernel density estimation(KDE)were introduced to reduce the influence of inductance error and sampling error on the accuracy of the strategy in order to ensure the accuracy and efficiency of the strategy.The simulation and experiment platform of 1 kV·A aeronautical static converter was constructed.The simulation and experimental results show that this control strategy has high accuracy for power backflow recognition.The backflow power was significantly suppressed,and the no-load and the light-load efficiency of the circuit were improved.