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Despite being employed in burgeoning efforts to improve power delivery efficiency, integrated voltage regulators (IVRs) have yet to be evaluated in a rigorous, systematic, or quantitative manner. To fulfill this need, we present Ivory, a high-level design space exploration tool capable of providing accurate conversion efficiency, static performance characteristics, and dynamic transient responses...
Wide bandgap devices (WBGs) allow Power Factor Correction (PFC) circuits to operate at MHz frequency which leads to a better power density. Compared with kHz operation, MHz PFC in critical conduction mode (CrM) yields larger inductor valley current during the switch soft turn-on. Moreover, the input current distortion near grid voltage zero crossing has not been taken into account in the traditional...
This paper presents the small-signal modeling and controller design of a single phase multilevel, three-port based on gallium nitride (GaN) devices for renewable energy and UPS applications. The system has two ac-port with five-level waveforms and one DC port. A small-signal model of the converter is derived by the method of state-space averaging. It is controlled with two loops, an outer voltage...
Paralleling devices is an effective way to achieve higher power applications while still having the convenience brought by discrete devices. However, very few papers investigate the challenges of paralleling Gallium Nitride high electron mobility transistors (GaN HEMTs) in cascode configuration, especially the potential failure modes and its related mechanisms. In this paper, a comprehensive study...
A full-bridge current-source isolated dc/dc converter for Photovoltaic applications is proposed in this paper. The converter utilizes a Quasi-Switched-Capacitor circuit as the secondary side, which features a reduced number of switches and voltage stresses, and an additional boost function. Through the proposed control algorithm, soft-switching can be realized for all switches. A 1.2 kW, 1 MHz, 40...
This paper presents the small-signal modeling and controller design of an isolated Quasi-Switched-Capacitor (QSC) dc/dc converter. The converter serves as an auxiliary power supply in automotive applications, connecting the highvoltage battery and the 14 V power net. It employs a front-stage QSC dc/ac circuit with a 3:1 voltage step-down ratio, and a poststage synchronous-rectifier, current-doubler...
Lowering the supply voltage to improve energy efficiency leads to higher load current and elevated supply sensitivity. In this paper, we provide the first quantitative analysis of voltage noise in multi-core near-threshold processors in a future 10nm technology across SPEC CPU2006 benchmarks. Our results reveal larger guardband requirement and significant energy efficiency loss due to power delivery...
This paper presents a small-signal model of parallel inverters based on the droop control method for power sharing in a stand-alone micro-grid. The control method for parallel inverters is based on the frequency-active power and amplitude-reactive power droops, which only depends on the local variable measurements. The small-signal stability is analyzed and some root locus plots are provided with...
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