Feedforward enhanced feedback control in isolated switched-mode power converters with secondary-side rectified voltage sensing

The invention relates to feedforward enhanced feedback control in isolated switched-mode power converters with secondary-side rectified voltage sensing. An isolated switched-mode power converter converts power from an input source into power for an output load. Power switches within a primary-side power stage control the amount of power input to the power converter and, ultimately, provided to theoutput load. A digital controller on the secondary side of the power converter generates signals to control the power switches. This generation is based upon closed-loop (feedback) control as well asfeedforward control. The feedforward control compensates for variations in the voltage of the input source. The input voltage is estimated by sensing a rectified voltage at a node between a secondarywinding of the isolation transformer and an output filter. The feedforward compensation modifies the generated switch control signals based upon the sensed rectified voltage. 本公开涉及具有次级侧整流电压感测的隔离开关模式功率转换器的前馈增强反馈控制，例如，一种隔离开关模式功率