Primary controller applied to a primary side of a power converter and operation method thereof

Abstract

A primary controller applied to a primary side of a power converter includes a current peak upper limit adjustment circuit and a gate control signal generation circuit. The current peak upper limit adjustment circuit increases a current peak upper limit of the primary side of the power converter when a gate control signal is enabled at a second valley of a voltage, and reduces the current peak upper limit when the gate control signal is enabled at an Nth valley of the voltage, wherein N is a positive integer. The gate control signal generation circuit is coupled to the current peak upper limit adjustment circuit, wherein the gate control signal generation circuit enables the gate control signal, disables the gate control signal according to the current peak upper limit, and the gate control signal is used for turning on a power switch of the primary side of the power converter.

Dependencies are inferred from the claim text.