Patent Number: 6,310,786

Title: Switching power-supply circuit

Abstract: The present invention relates to a switching power-supply circuit comprising: rectifying and smoothing means for generating a rectified and smoothed voltage and outputting the rectified and smoothed voltage as a direct-current input voltage; an insulating converter transformer for transferring a primary-side output to a secondary side; switching means for intermittently passing on the direct-current input voltage to a primary winding of the insulating converter transformer; a primary-side resonance circuit translating an operation of the switching means into voltage resonance; power-factor improvement means for improving a power factor by generating intermittently a rectified current based on the fed-back switching output voltage; a secondary-side resonance circuit on a secondary side of the insulating converter transformer; direct-current output voltage generation means carrying out a rectification operation in order to generate a secondary-side direct-current output voltage; and constant-voltage control means for executing constant-voltage control on the secondary-side direct-current output voltage.

Inventors: Yasumura; Masayuki (Kanagawa, JP)

Assignee: Sony Corporation

International Classification: H02M 1/00 (20060101); H02M 3/24 (20060101); H02M 3/338 (20060101); H02M 003/335 ()

Expiration Date: 10/30/2018