The present invention relates to a power saving circuit of a USB monitor for realizing a power saving mode in a monitor applied to a USB technology and includes a transformer for outputting an AC voltage according to a winding ratio of a primary winding and a secondary winding, A feedback voltage control unit for monitoring a variation of a first output voltage (200V) which is the highest level among secondary-side output voltages of the transformer and feeding back the primary output voltage to the primary side to stabilize an AC voltage output from the secondary side of the transformer; And a second output voltage (80V) that is lower than the first output voltage is provided to the voltage stabilizing unit when the control signal is inputted to drive the feedback voltage control unit to lower the output voltage of the secondary side of the transformer as a whole, And when the monitor is driven in the power saving mode, the second output voltage is received When a driving voltage to the voltage stabilizing part, and a power saving mode monitor output is constituted by USB drive voltage output for outputting a USB drive voltage by receiving the input voltage of the voltage stabilizing portion.;Therefore, the present invention has an effect of continuously supplying the USB driving voltage to the USB hub and devices even when the monitor is driven in the off mode.
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