PFC Bus Voltage Control Circuit
Priority 2018-04-03 • Filing 2018-04-03 • Publication 2018-07-20
Abstract
The invention discloses a PFC bus voltage control circuit comprising an input end, a PFC controller and an output end and further comprising a control unit, wherein the control unit is arranged between the input end, the PFC controller and the output end. The control unit is configured to detect an input voltage and adjust a bus voltage according to the detected magnitude of the input voltage, wherein the control unit controls the bus voltage to decrease with the decrease of the input voltage when the input voltage is lower than a preset voltage value. According to the PFC bus voltage controlcircuit, the goal of adjusting bus voltage when the low voltage is input into the PFC circuit can be achieved, the problem that the voltage difference of the PFC circuit is relatively large due to theconstant output of the bus voltage when the low voltage is input is solved. Meanwhile, the decrease of the voltage difference of the PFC circuit means that the temperature rise of the PFC circuit issignificantly improved, which greatly enhances the reliability of a switching power supply circuit and improves the service life of a switching power supply.
CN108304024A
CN Application
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Family: CN (1)
Date App/Pub Number Status
2018-04-03 CN 201810286069
2018-07-20 CN108304024A Application