Non-isolated multi-port high-voltage ratio bidirectional DC-DC converter

A multi-port interleaved charge pump DC-DC converter addresses inefficiencies in conventional converters by enabling a single converter to handle multiple ESSs with wide voltage ratios and balanced currents, enhancing efficiency and adaptability in DC microgrid systems.

JP2026085821APending Publication Date: 2026-05-25KOBE UNIV
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Patent Information

Authority / Receiving Office
JP Β· JP
Patent Type
Applications
Current Assignee / Owner
KOBE UNIV
Filing Date
2024-11-13
Publication Date
2026-05-25

AI Technical Summary

Technical Problem

Conventional bidirectional DC-DC converters are large, costly, and inefficient for wide voltage ratio applications, requiring multiple converters to connect energy storage systems (ESS) to a DC microgrid system, and they struggle with current imbalances and limited duty cycle ranges in interleaved charge-pump converters.

Method used

A multi-port interleaved charge pump bidirectional DC-DC converter with a first and second two-phase interleaved charge pump converters, using a drive circuit for switch control and next-generation power semiconductor devices, allowing for a single converter to connect multiple ESSs with wide voltage ratio capabilities and asymmetric duty cycle control.

Benefits of technology

The solution achieves high power density, reduced costs, and efficient energy transfer across different voltage levels with balanced inductor currents, adapting to load and power fluctuations, and supports hybrid energy sources like PV and FC systems.

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Abstract

We provide a multi-port interleaved charge pump bidirectional DC-DC converter that allows multiple ESSs to be connected to a DC microgrid system with a single bidirectional DC-DC converter. [Solution] The system comprises two two-phase interleaved charge pump bidirectional DC-DC converters, three charge pump capacitors, and a drive circuit that controls each switch of the DC-DC converters. The negative terminals of the two DC-DC converters are common-connected, the low-voltage sides of the two DC-DC converters are connected to two different low-voltage DC voltage sources, the high-voltage sides of the two DC-DC converters are multiple-connected, and the inductors that constitute the interleaved system but are not connected to the charge pumps are connected to the connection point via three charge pump capacitors and connected to one high-voltage DC voltage source.
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