SYSTEMS AND METHODS FOR REDUCING ELECTROMAGNETIC INTERFERENCE BY ADJUSTING SWITCHING PROCESSES

摘要

System and method for regulating a power conversion system. An example system controller for regulating a power conversion system includes a signal generator and a driving component. The signal generator is configured to receive a feedback signal associated with an output signal of a power conversion system and a current sensing signal associated with a primary current flowing through a primary winding of the power conversion system and generate a modulation signal based on at least information associated with the feedback signal and the current sensing signal. The driving component is configured to receive the modulation signal and output a drive signal to a switch based on at least information associated with the modulation signal.

主权项

1. A system controller for regulating a power conversion system, the system controller comprising:
a signal generator configured to receive a feedback signal associated with an output signal of a power conversion system and a current sensing signal associated with a primary current flowing through a primary winding of the power conversion system and generate a modulation signal based on at least information associated with the feedback signal and the current sensing signal; and a driving component configured to receive the modulation signal and output a drive signal to a switch based on at least information associated with the modulation signal; wherein the driving component is further configured to, if the modulation signal changes from a first logic level to a second logic level, change the drive signal in magnitude from a first magnitude value to a second magnitude value during a first time period in order to close the switch, the first time period being larger than zero.