基于电流重建的数字单周期控制功率因数校正

Digital One Cycle Control Power Factor Correction Based on Current Rebulid

传统的Boost电路单周期控制功率因数校正(PFC)需对输入电流进行采样,采样方法一般为串联电阻侧电压。该方法中若采样位置靠近开关动作时刻,会有很大的干扰进入采样环节,若采样位置距离开关动作时刻较远,采样得到的输入电流又会与电流峰值产生一定的误差从而影响占空比。针对以上缺点,这里欲采用计算方法得到输入电流而非采样的方法,这样一方面避免了在开关动作时刻附近采样引入的开关噪声,又避免了采样位置距离开关动作时刻较远造成的占空比误差,这种对输入电流的计算称为电流的重建。

The nonlinear-carrier controller power factor correction （PFC） needs sample the input current in the tradi- tional Boost circuit, the method of sampling is measure the voltage on series resistors ,when the sampling position close to the switch action time, there will be a lot of interference into the sampling link, if the sampling position is far away from the switch action time, the input current and the current peak value will produce a certain error which influences the duty cycle.In view of the above shortcomings, this paper wants to use the method of calculating the in- put current rather than the sampling method, on the one hand, the switching noise is avoided in the vicinity of the switching action time, and the duty cycle error caused by the sampling position far away from the switch action time is avoided, this calculation of the input current is called the rebulid of the current.