Patent ID: 9397550
Filing Date: 2016-07-19
CPC Classification: H02H,H02M

Claim Text:
1. A system controller for protecting a power conversion system, the system controller comprising: a first controller terminal configured to provide a drive signal to close and open a switch to affect a first current flowing through a primary winding of a power conversion system, the drive signal being associated with one or more switching periods including one or more first switching periods and one or more second switching periods; a second controller terminal configured to receive one or more first input signals during the one or more first switching periods and receive one or more second input signals during the one or more second switching periods; and an over-temperature-protection component configured to receive a first voltage signal associated with a first input current flowing through a first resistor during a third switching period of the one or more first switching periods and receive a second voltage signal associated with a second input current flowing through the first resistor during a fourth switching period of the one or more first switching periods, the first input current and the second input current being different in magnitude; wherein the system controller is configured to: wherein the system controller is further configured to: wherein the over-temperature-protection component is further configured to, in response to a difference between the first voltage signal and the second voltage signal being larger than a first predetermined threshold in magnitude, output a protection signal to generate the drive signal to cause the switch to open and remain open to protect the power conversion system.