Title:
NEUTRAL-POINT VOLTAGE BALANCE CONTROL IMPROVEMENT METHOD FOR THREE-LEVEL BIDIRECTIONAL DCDC CONVERTER
Document Type and Number:
WIPO Patent Application WO/2024/065985
Kind Code:
A1
Abstract:
The present invention provides a neutral-point voltage balance control improvement method for a three-level bidirectional DCDC converter, comprising the following steps: respectively sampling an upper bridge arm supporting capacitor voltage, a lower bridge arm supporting capacitor voltage, and an inductor current; and according to a relationship between the upper bridge arm supporting capacitor voltage and the lower bridge arm supporting capacitor voltage and the direction of the inductor current, selecting a switching tube adjusting a duty ratio, and controlling the balance of the neutral-point voltage of the three-level bidirectional DCDC converter. The inductor current can also be selected from an input current or an output current in a DCDC converter circuit, and the balance of the neutral-point voltage of the three-level bidirectional DCDC converter is controlled; and the neutral-point voltage out-of-control problem caused by factors such as zero drift of a current detection circuit is avoided by reasonably selecting the switching tube adjusting the duty ratio.
Inventors:
GUO QILIANG (CN)
BI HONGDA (CN)
XU MINGXIA (CN)
LIU JINJING (CN)
ZOU CUNZUO (CN)
BI HONGDA (CN)
XU MINGXIA (CN)
LIU JINJING (CN)
ZOU CUNZUO (CN)
Application Number:
PCT/CN2022/132734
Publication Date:
April 04, 2024
Filing Date:
November 18, 2022
Export Citation:
Assignee:
CRRC DALIAN R&D CO LTD (CN)
International Classes:
H02M3/158; H02M1/088
Foreign References:
| CN110611448A | 2019-12-24 | |||
| CN109889048A | 2019-06-14 | |||
| CN111049381A | 2020-04-21 | |||
| CN103401455A | 2013-11-20 | |||
| US6333569B1 | 2001-12-25 | |||
| US20160172976A1 | 2016-06-16 |
Attorney, Agent or Firm:
DALIAN EAST PATENT AGENT LTD. (CN)
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