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A Natural Bidirectional Input-Series–Output-Parallel LLC-DCX Converter With Automatic Power Sharing and Power Limitation Capability for Li-Ion Battery Formation and Grading System
- Source :
- IEEE Journal of Emerging and Selected Topics in Power Electronics. 8:3618-3632
- Publication Year :
- 2020
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2020.
-
Abstract
- For the high-power Li-ion battery (LIB) formation and grading system, using a multistage conversion structure, an isolated bidirectional dc–dc converter with a high input voltage, and a large output current is needed to achieve isolation and a relatively fixed voltage conversion gain. This article proposes a modulation strategy and modifies the topology to achieve natural bidirectional power transfer, automatic power sharing, and power limitation for an input-series–output-parallel (ISOP) LLC-DC transformer (DCX) converter. First, an active pulsewidth modulation (PWM) strategy is proposed to avoid synchronous rectifier (SR) sensing and to achieve the natural bidirectional power flow for each submodule. The resonant current always keeps discontinuous, and the conversion gain can keep constant if ignoring the conductive resistance. Second, clamping diodes are added in the conventional LLC converter to limit the inrush current during startup, and to achieve a constant power limitation under an overload condition. Third, with the proposed modulation, the power sharing of the two-module ISOP LLC converter is analyzed and compared with the conventional ISOP LLC converter. Finally, experiments based on an 8-kW (output: 15 V/533 A) prototype composed of the two-module ISOP LLC converter are conducted to verify the effectiveness of the proposed solution.
- Subjects :
- 010302 applied physics
business.industry
Computer science
020208 electrical & electronic engineering
Electrical engineering
Energy Engineering and Power Technology
Topology (electrical circuits)
02 engineering and technology
01 natural sciences
Inrush current
law.invention
Power (physics)
law
0103 physical sciences
Limit (music)
0202 electrical engineering, electronic engineering, information engineering
Maximum power transfer theorem
Electrical and Electronic Engineering
business
Transformer
Pulse-width modulation
Voltage
Subjects
Details
- ISSN :
- 21686785 and 21686777
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- IEEE Journal of Emerging and Selected Topics in Power Electronics
- Accession number :
- edsair.doi...........3362cdedb2f7e43e15fd0a4c69bd4cbc