An intermediate bus architecture power supply system including an output voltage feedback-regulated, isolated first stage switching voltage converter (SVC) such as an intermediate bus converter, connected via an intermediate voltage bus (IVB) to at least one second stage DC-to-DC voltage converter. The first stage SVC is configured to adjust its switching duty cycle to compensate for voltage fluctuations on the IVB. The voltage regulation mechanism of the first stage SVC may thus suppress oscillations in the IVB voltage which originate from the first stage SVC's input or from fluctuations in the system's load current, and consequently reduce electromagnetic interference as well as the amplitude of voltage and current fluctuations on the IVB.