Reconfigurable Auxiliary Circuits for Transient Improvement in Multiprocessor Power Supplies

To meet the requirements of faster transient response in multiprocessor power supplies, this paper proposes a new auxiliary circuit that can be shared between several loads. The auxiliary circuit can connect to any load during the transient by reconfiguring the energy path. Costs and space are further saved since only one auxiliary circuit is needed, no matter how many processors the system has. The design of the auxiliary circuit is explained and implemented as a two-phase interleaved buck converter with several switches. Simulation results for a 250A step current with a slew rate of ±1200A/μs and experimental results for a 70A step current with a slew rate of -150A/μs are provided for verification, showing a 44% reduction in the overshoot voltage, a 34% reduction in the undershoot voltage, and nearly half the output capacitor area savings.