ISOLATING POWER SUPPLY AND OUTPUT FEEDBACK METHOD THEREFOR

At least some embodiments of present invention provide an isolated power supply and an output feedback method for the isolated power supply. The isolated power supply includes: an inverter circuit, an isolation transformer, a rectifier circuit and a controller, wherein the isolation transformer comprises at least one primary winding and at least one secondary winding, and the controller is located at a side of the at least one primary winding; the inverter circuit is arranged to convert an input voltage signal of the isolated power supply into a first high-frequency switching signal, and transmit the first high-frequency switching signal to the at least one primary winding; the isolation transformer is arranged to couple the first high-frequency switching signal on the at least one primary winding to the at least one secondary winding, form a second high-frequency switching signal on the at least one secondary winding, couple the second high-frequency switching signal on the at least one secondary winding to the at least one primary winding and form a third high-frequency switching signal on the at least one primary winding; the rectifier circuit is arranged to convert the second high-frequency switching signal on the at least one secondary winding into a direct-current voltage signal; the controller is arranged to obtain the third high-frequency switching signal, obtain an amplitude of the direct-current voltage signal according to the third high-frequency switching signal, and control the inverter circuit according to the amplitude so as to configure the amplitude as a preset threshold value. The isolated power supply solves a problem of a large volume and small power density of a power supply.