SWITCHING POWER SUPPLY CIRCUIT

摘要

A switching power supply circuit having an improved ability to supply current to a dynamic load in which the current consumption increases instantaneously and adapted for efficiently and stably supplying electric power to a steady load whose consumption current varies with a small variation width. The switching power supply circuit comprises a first transformer having a core of an amorphous magnetic material, a second transformer having a core of a ferrite magnetic material, a first switching element for flowing a current through the primary-side winding of the first transformer according to a first drive signal, a second switching element for flowing a current through the primary-side winding of the second transformer according to a second drive signal, first and second output circuits for generating first and second output voltages according to the voltages induced in the secondary-side windings of the first and second transformers, respectively, and first and second control circuits for independently generating the first and second drive signals.