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Title: A fully soft switched point-of-load converter for resource constraint drone applications
Authors: Qu, Yong
Shu, Wei
Chang, Joseph Sylvester
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Qu, Y., Shu, W. & Chang, J. S. (2019). A fully soft switched point-of-load converter for resource constraint drone applications. IEEE Transactions On Power Electronics, 35(3), 2705-2713.
Journal: IEEE Transactions on Power Electronics
Abstract: The power efficiency and weight of present point-of-load (POL) dc-dc converters for drone applications are often compromised because they suffer from large switching losses at continuous conduction mode for heavy loads and excessive hardware overheads at discontinuous conduction mode for light loads. This paper presents a boundary conduction mode (BCM) control scheme for POL converters embodying a single operation mode. This is achieved by means of a hysteresis voltage controller to turn on/off the output power stage when necessary. The proposed BCM control scheme achieves high power efficiency (≥91.2%) over a wide load range (5 mA-1 A) by means of fully soft switching. Specifically, a hysteretic current controller is proposed to realize ZCS, and an adaptive dead time controller is proposed to realize ZVS. Further, the proposed BCM control scheme requires a small output inductor (0.82 μH) by means of designing the customizable peak inductor current. To verify the proposed BCM control scheme, we realize a BCM-based POL converter that features an input voltage range of 5-16 V, output voltage range of 2.5-8 V, switching frequency of 1.5 MHz, peak power efficiency of 96.8%, and ≤35 mV output voltage undershoot/overshoot for 1-A load step. When being benchmarked against state-of-The-Art counterparts, the proposed design features the lowest voltage undershoot/overshoot, the highest switching frequency, ∼5.7× smaller inductor, and ∼11% higher power efficiency at light loads.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2019.2929164
Schools: School of Electrical and Electronic Engineering 
Rights: © 2019 IEEE. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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