仅检测电感电流的AD/DC升压变换器非线性载波控制

Single Current Sensor Nonlinear-carrier Control for AC/DC Boost Converters

非线性载波控制针对开关变换器固有的非线性在控制信号中引入非线性载波,能够达到高功率因数和输出电压快速调节的控制效果。针对仅检测电感电流实现非线性载波控制的目的,结合了目前研究的新进展,以升压变换器为控制对象研究了使用线性斜率跟随器简化控制器检测电路的电路实现,建立了控制器电流环路的小信号模型并进行了Matlab仿真。改进后的控制器不仅保留了非线性载波控制原有的优点,更简化了检测电路并易于在集成电路中实现。

Nonlinear Carrier Control （NLC） compensates the intrinsic nonlinear character of switching converters with nonlinear carrier control signal to accomplish high power factor and rapid output voltage adjustment. As to reduce the feedback signals to only inductor current,linear Ramp Follower （LRF） is introduced into the NLC controller. The new NLC controller for boost AC/DC converter is studied. The current loops are analyzed and modeled, then stability of current loops is verified by Matlab simulation. The new NLC controller with single current sensing not only maintains the original NLC merits, but also simplifies the sensing technique which is easy to integrate.