Noise suppression circuit and suppression method

• Main Author: LIU BAIREN
• Format: Patent
• Language: Chinese; English
• Published: 28.01.2022
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention discloses a noise suppression circuit which comprises a demagnetization detection circuit, a switch control circuit and an operational amplifier control circuit. The demagnetization detection circuit is coupled with the switch control circuit, and controls the switch control circuit to select to conduct different current paths according to the detected demagnetization detection signal; the switch control circuit is coupled with the operational amplifier control circuit, and the switch control circuit controls the transmission of an operational amplifier control signal in the operational amplifier control circuit by selectively conducting different current paths; the operational amplifier control circuit is used for transmitting the operational amplifier control signal and controlling output according to the operational amplifier control signal; and the output of the operational amplifier control circuit is used for controlling the switching frequency and the turn-on time of the switching tube. A