A Novel Bipolar PFC Converter for Battery Charging Application
Al-Hysam, Abdullah LU
(2024)
- Abstract
- Power electronic converters are pivotal while designing any charging scheme, regardless of the battery capacity and application. Nowadays, Power Factor Correction (PFC) converters have become popular for various battery charging systems due to their simple configurations. Single-Ended Primary-Inductor Converter (SEPIC) and Cuk PFC converters are preferred over buck-boost converters in this regard due to their higher efficiencies, lower current ripples, and continuous input current features. Despite having almost identical configurations, SEPIC and Cuk converters have their pros and cons. That being said, these two converters can be controlled together with a single switch to obtain a bipolar output. This novel bipolar converter holds the... (More)
- Power electronic converters are pivotal while designing any charging scheme, regardless of the battery capacity and application. Nowadays, Power Factor Correction (PFC) converters have become popular for various battery charging systems due to their simple configurations. Single-Ended Primary-Inductor Converter (SEPIC) and Cuk PFC converters are preferred over buck-boost converters in this regard due to their higher efficiencies, lower current ripples, and continuous input current features. Despite having almost identical configurations, SEPIC and Cuk converters have their pros and cons. That being said, these two converters can be controlled together with a single switch to obtain a bipolar output. This novel bipolar converter holds the advantages of both the converters mentioned earlier. In addition, the inclusion of a switched-inductor configuration at the input side exhibits a higher voltage gain in a lower duty cycle, resulting in a reduced conduction loss in the switch. Moreover, the coexistence of SEPIC and Cuk converters ensures an interleaved mechanism, which necessitates only half the switching frequency compared to that of a single converter, reducing the power losses during reverse recovery transitions of the diodes. Apart from that, the presence of a single switch at the input side makes it easier to design and control the gate driver to provide a steady bipolar DC-link voltage, which can be fed to two Dual Active Bridge (DAB) or Phase-Shifted Full-Bridge (PSFB) converters to charge two batteries of different capacities simultaneously, providing the galvanic isolation at the same time. While the bipolar converter ensures the PFC control, the following DAB or PSFB converters account for the typical constant-current and constant-voltage (CC-CV) charging mechanism. Therefore, the proposed bipolar PFC converter, based on a hybrid SEPIC-Cuk combination, not only improves the power quality, such as input power factor and total harmonic distortion (THD) but also makes the control circuitry simple and concise due to its simplistic architecture. On top of that, the derived small-signal model and the average current mode (ACM) control strategy facilitate realizing the converter dynamics with reduced poles and considerably reduced overshoot, settling, and rise time. Last but not least, a complete design guideline and soft-switching control technique for the cascaded PSFB and DAB converters were obtained to improve the efficiency at the DC-DC power stage. Finally, the novel hybrid bipolar PFC converter was tested in the Power Hardware-in-the-Loop (PHIL) laboratory environment. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4048512d-6f05-4603-ba26-1bc30dcf5186
- author
- Al-Hysam, Abdullah
LU
- supervisor
- publishing date
- 2024-05-29
- type
- Thesis
- publication status
- published
- subject
- pages
- 78 pages
- project
- EV Charging Topologies
- language
- English
- LU publication?
- no
- id
- 4048512d-6f05-4603-ba26-1bc30dcf5186
- date added to LUP
- 2025-04-23 15:48:51
- date last changed
- 2025-04-24 10:14:17
@misc{4048512d-6f05-4603-ba26-1bc30dcf5186,
abstract = {{Power electronic converters are pivotal while designing any charging scheme, regardless of the battery capacity and application. Nowadays, Power Factor Correction (PFC) converters have become popular for various battery charging systems due to their simple configurations. Single-Ended Primary-Inductor Converter (SEPIC) and Cuk PFC converters are preferred over buck-boost converters in this regard due to their higher efficiencies, lower current ripples, and continuous input current features. Despite having almost identical configurations, SEPIC and Cuk converters have their pros and cons. That being said, these two converters can be controlled together with a single switch to obtain a bipolar output. This novel bipolar converter holds the advantages of both the converters mentioned earlier. In addition, the inclusion of a switched-inductor configuration at the input side exhibits a higher voltage gain in a lower duty cycle, resulting in a reduced conduction loss in the switch. Moreover, the coexistence of SEPIC and Cuk converters ensures an interleaved mechanism, which necessitates only half the switching frequency compared to that of a single converter, reducing the power losses during reverse recovery transitions of the diodes. Apart from that, the presence of a single switch at the input side makes it easier to design and control the gate driver to provide a steady bipolar DC-link voltage, which can be fed to two Dual Active Bridge (DAB) or Phase-Shifted Full-Bridge (PSFB) converters to charge two batteries of different capacities simultaneously, providing the galvanic isolation at the same time. While the bipolar converter ensures the PFC control, the following DAB or PSFB converters account for the typical constant-current and constant-voltage (CC-CV) charging mechanism. Therefore, the proposed bipolar PFC converter, based on a hybrid SEPIC-Cuk combination, not only improves the power quality, such as input power factor and total harmonic distortion (THD) but also makes the control circuitry simple and concise due to its simplistic architecture. On top of that, the derived small-signal model and the average current mode (ACM) control strategy facilitate realizing the converter dynamics with reduced poles and considerably reduced overshoot, settling, and rise time. Last but not least, a complete design guideline and soft-switching control technique for the cascaded PSFB and DAB converters were obtained to improve the efficiency at the DC-DC power stage. Finally, the novel hybrid bipolar PFC converter was tested in the Power Hardware-in-the-Loop (PHIL) laboratory environment.}},
author = {{Al-Hysam, Abdullah}},
language = {{eng}},
month = {{05}},
title = {{A Novel Bipolar PFC Converter for Battery Charging Application}},
url = {{https://lup.lub.lu.se/search/files/217757118/A_Novel_Bipolar_PFC_Converter_for_Battery_Charging_Application.pdf}},
year = {{2024}},
}