Importance

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Abstract

A power supply circuit includes a bridge circuit, a transformer, a rectifying and smoothing circuit, a driver, a feedback circuit, and a power supply section. The bridge circuit converts a direct-current voltage into an alternating-current voltage. The transformer includes a primary winding wire and a secondary winding wire. The rectifying and smoothing circuit converts the alternating-current voltage into a direct-current output voltage and supplies the direct-current output voltage to a direct-current load. The driver controls ON and OFF of the switching element. The feedback circuit receives a detection signal of an output current flowing to the direct-current load and a differential signal obtained from fluctuation of the output voltage and feedback-controls the driver on the basis of the signals. The power supply section generates a driving voltage corresponding to the feedback circuit from the output voltage and supplies the driving voltage to the feedback circuit.

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First Claim