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Keywords = USB-PD

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20 pages, 6407 KB  
Article
Influence of the Type of Load on Characteristics of a Dedicated USB PD Charging System—A Case Study
by Przemysław Ptak, Tadeusz Lorkowski and Krzysztof Górecki
Appl. Sci. 2025, 15(10), 5254; https://doi.org/10.3390/app15105254 - 8 May 2025
Viewed by 2148
Abstract
This paper presents the results of an experimental study on the charging process of selected mobile device batteries using a dedicated charging system operating in the Universal Serial Bus Power Delivery (USB PD) mode. The charging circuit was developed in the Flyback topology [...] Read more.
This paper presents the results of an experimental study on the charging process of selected mobile device batteries using a dedicated charging system operating in the Universal Serial Bus Power Delivery (USB PD) mode. The charging circuit was developed in the Flyback topology using a power factor correction (PFC) circuit. A block diagram of the charging system under consideration and a block diagram of the measurement set-up are presented. Power resistors with different resistance values and two selected mobile devices with different built-in battery capacitances were used as the load of the charging system under test. The test results are presented as a function of load resistance and the State of Charge (SoC) level of the batteries used. The measurement results obtained are discussed. Full article
(This article belongs to the Section Electrical, Electronics and Communications Engineering)
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21 pages, 7747 KB  
Article
Analysis and Optimization of a Regenerative Snubber for a GaN-Based USB-PD Flyback Converter
by Fabio Cacciotto, Alessandro Cannone, Emanuele Cassarà and Santi Agatino Rizzo
Electronics 2024, 13(6), 1045; https://doi.org/10.3390/electronics13061045 - 11 Mar 2024
Cited by 3 | Viewed by 3302
Abstract
This paper presents a high-efficiency GaN-based 65 W Quasi-Resonant (QR) Flyback converter. The converter is characterized by a wide input voltage range and a variable output voltage, and it is designed as a Switch Mode Power Supply (SMPS) for high power density USP-Power [...] Read more.
This paper presents a high-efficiency GaN-based 65 W Quasi-Resonant (QR) Flyback converter. The converter is characterized by a wide input voltage range and a variable output voltage, and it is designed as a Switch Mode Power Supply (SMPS) for high power density USP-Power Delivery (USB-PD) applications. To increase the efficiency and power density, a regenerative snubber clamp solution has been used to limit the excursion of the drain voltage during the power switch turn-off. The activity involved the modeling of the converter, the sizing of the regenerative snubber, and the design of the flyback transformer. Furthermore, a dedicated test application board was used to verify the effectiveness of the solution. The results were compared with those obtained using a flyback converter with an RCD snubber. Full article
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16 pages, 8355 KB  
Article
(All-in-One) Power Supply System for Mobile and Network-Wired Raspberry Pi-Based Internet of Things Applications
by Daniel Pascal Hausherr and Dirk Berben
Hardware 2023, 1(1), 54-69; https://doi.org/10.3390/hardware1010005 - 21 Dec 2023
Viewed by 3248
Abstract
Internet of Things (IoT) applications based on the single-board computer Raspberry Pi depend on reliable and sufficiently powerful energy systems to allow system diversity, flexibility, and available computing power. On this account, we developed an all-in-one module to simplify both the autonomous and [...] Read more.
Internet of Things (IoT) applications based on the single-board computer Raspberry Pi depend on reliable and sufficiently powerful energy systems to allow system diversity, flexibility, and available computing power. On this account, we developed an all-in-one module to simplify both the autonomous and network-wired power supply of Raspberry Pi-based systems. The module generates a stable voltage of 5.1 VDC with an available maximum current of 3 A to power a single Raspberry Pi model 3B+ or 4 and furthermore provides an additional power source of 3 VDC–12 VDC at a maximum of 3 A for use by arbitrary peripherals. To accommodate different use cases, the system has various energy supply options such as a 4S lithium polymer (LiPo) battery for autonomous operation, including a battery management and charging solution, as well as wire-based options, such as USB-C with USB Power Delivery (USB-PD) or Power over Ethernet (PoE+) via an additional module. Full article
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