Patent ID: 9584030
Date: 2017-02-28
CPC Classifications: H02M,Y02B

Claim:
1. A controller for eliminating acoustic noise of a power converter, the controller comprising: a feedback pin for receiving a feedback voltage from a secondary side of the power converter, wherein the feedback voltage corresponds to an output voltage of the secondary side of the power converter; a current detection pin for generating a detection voltage according to a current flowing through a primary side of the power converter and a resistor; a burst mode signal generation module coupled to the feedback pin for generating a burst mode signal according to a first reference voltage and the feedback voltage, or according to a second reference voltage and the feedback voltage, wherein the burst mode signal generation module comprises: a gate signal generation unit coupled to the burst mode signal generation module for generating a gate control signal corresponding to a burst mode of the power converter to a power switch of the primary side of the power converter according to the burst mode signal, wherein the power switch is turned on according to the gate control signal; and a turning-on time generation unit coupled to the burst mode signal generation module, the current detection pin, and the gate signal generation unit for determining a turning-on time of the power converter in the burst mode of the power converter according to the first reference voltage and the detection voltage, or according to the second reference voltage and the detection voltage.