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TMS320F280048-Q1: current control loop cannot be realized

Part Number: TMS320F280048-Q1

基于F280049totem pole PFC control,有以下这些问题不明白,请帮忙给解释下.

 

  1. 关于电压环输出到电流环的给定,标记的vBusAvg/vRmsAvg与传统的乘法器不同,如何理解基于C2000电压控制环路的这个乘法系数;
  2. 更重要的是为什么在电流环输出到赋值占空比之间又加了Bus voltage feedforward, AC voltage feedforward and Boost voltage drop feedforward环节,如果拿掉feedforward环节,电流环无法实现close loop control。