A distributed Bi-directional hysteresis control algorithm for server-to-virtual bus differential power processing

This paper presents a control method for regulating serially connected server voltages. Following the discussion of the proposed control method, both simulations and an experimental study are performed for validation. A simulation model is used to optimize system parameters for maximizing the system-level power conversion efficiency. For the experimental study, a test-bed consisting of four 12 V servers and four dual active bridge converters is built and the control method is implemented on a digital controller. The experimental measurements show that the proposed control method achieves successful voltage regulation of serially connected servers and a system-level power conversion efficiency as high as 99.89%.