CONTROL CIRCUIT FOR REDUCING ELECTROMAGNETIC RADIATION AND CONTROL METHOD THEREFOR, AND ISOLATED POWER SUPPLY SYSTEM
World Intellectual Property Organization Patent
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Abstract
Disclosed are a control circuit for reducing electromagnetic radiation and a control method therefor, and an isolated power supply system. The control circuit comprises an inverter circuit, a first adaptive control circuit, a first oscillation circuit, and a first driving circuit; the inverter circuit is used for outputting a first voltage signal and a second voltage signal; the first oscillation circuit is used for generating and outputting a first oscillation signal; a first sampling end of the first adaptive control circuit receives the first voltage signal, and a second sampling end of the first adaptive control circuit receives the second voltage signal; an input end of the first adaptive control circuit is electrically connected to an output end of the first oscillation circuit, and an output end of the first adaptive control circuit is electrically connected to an input end of the first driving circuit; an output end of the first driving circuit is electrically connected to a control end of the inverter circuit. The output of the inverter circuit is adjusted by means of the first adaptive control circuit, so that the phase of the first voltage signal is the same as that of the second voltage signal, a common-mode voltage is reduced, and the electromagnetic radiation of the control circuit is further reduced.
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