Abstract: A pulse-width-modulated, switching power supply has a pulse width modulator, a full bridge network driving a pulse transformer, power switching section, a high frequency power transformer, an output rectifier and an output inductor. The power switching section includes two or more H-bridge networks each preferably having four FET's. The pulse transformer, controlled by the pulse width modulator, in turn controls the switching of the H-bridge networks. This switching is simultaneous in each H-bridge network, preferably to within 50 nanoseconds. The pulse transformer windings are coaxial and short. The outputs from the H-bridge networks are applied to in-phase windings of the power transformer. The power windings are segmented and wound on cores in side-by-side relationship to produce a "finite" mutual inductance among the primaries of the power transformer. This finite inductive coupling allows variations in the H-bridge power outputs of up to one dB.