Patent ID: 7035125

Claim:
A switching power supply comprising: a plurality of converters, each comprising a plurality of switching means, transforming means and rectifying means, connected in series on the input sides and in parallel on the output sides, thereby outputting a single output DC voltage, a first error amplifier for generating a first error signal by comparing said single output DC voltage output from said converters with a reference voltage and for amplifying said first error signal, an arithmetic unit for generating a single output current signal by detecting the currents output from said rectifying means of said plurality of converters, a second error amplifier for generating a second error signal by comparing said single output current signal from said arithmetic unit with the output of said first error amplifier and for amplifying said second error signal, and a plurality of PWM signal generators for generating PWM signals on the basis of the output signal of said second error amplifier and for PWM controlling said plurality of switching means.