摘要
为提高升降压变换器的轻载效率和功率密度,提出了一种迟滞控制结合PWM控制的非反相升降压变换器.设计出基于恒定电感电流的控制模式以减少对外部元器件的依赖性,并实现迟滞控制回路和PWM控制回路之间的平滑切换.针对降压和升压的工作模式推导出小信号模型,采用电感电流斜率的控制方法实现在一个开关周期内降压和升压模式之间的自动模式转换.结果表明,该变换器原型具有良好的动态响应能力,在满负载10 A电流下实现了94%的效率和95%的峰值效率.
The hysteresis control combined with PWM control non-inverting buck-boost was proposed to improve the light load efficiency and power density.The constant inductor current control(CICC)was established to mitigate the dependence on the external components and device variation and make smooth transition between hysteresis control loop and pulse width modulation(PWM)control loop.The small signal model was deduced for the buck and boost operation mode.The inductor current slope control(ICSC)was proposed to implement the automatic mode transition between buck and boost mode in one switching cycle.The results show that the converter prototype has good dynamic response capability,achieving 94%efficiency and 95%peak efficiency at full 10 A load current.
作者
姚苏毅
姜建国
Yao Suyi;Jiang Jianguo(School of Electronic Information and Electrical Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
关键词
四开关升降压转换器
电感电流斜率控制
恒电感电流控制
小信号模型
four switch buck-boost converter
inductor current slope control
constant inductor current control
small signal model
