Fenwick & West LLP
EMI frequency spreading method for switching power converter
A controller of a switching power converter sets an actual turn-on time of a switch in the switching power converter in each switching cycle by selecting one of a plurality of valley points of the output voltage of the switching power converter occurring subsequent to the desired turn-on time of the switch. The desired turn-on time of the switch may be calculated according to the regulation scheme employed by the switching power converter. The controller selects one of the plurality of valley points randomly from switching cycle to switching cycle. The controller generates a control signal to turn on the switching power converter at the selected one of the plurality of valley points of the output voltage occurring subsequent to the desired turn-on time.
Dialog Semiconductor Inc.
H H
H02M H02M
inventional inventional
John William Junjie Yong David Fuqiang
Kesterson Zheng Li Nguyen Shi