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公开(公告)号：EP3916975A2
公开(公告)日：2021-12-01
申请号：EP21171009.0
申请日：2021-04-28
发明人： LIU, Teng , YING, Jianping , QIAO, Lifeng , WANG, Xin , XIAO, Hongwei
IPC分类号： H02M1/00 , H02M1/088 , H02M3/00 , H02M3/335 , H02M5/458 , H02M7/08 , H02M7/23 , H02M7/48 , H02M7/487 , H02M7/493
摘要： Embodiments of the present invention provide a conversion device connected between an alternating current (AC) power grid and a load, wherein the conversion device comprises: an inductor electrically connected to the AC power grid; a first-stage converter having a first terminal electrically connected to the inductor and a second terminal electrically connected to a bus, and the first-stage converter being configured to output a bus voltage according to the AC power grid, wherein the first-stage converter comprises an N-level alternating current-direct current (AC-DC) converter, and the N-level AC-DC converter comprises a plurality of switch bridge arms, wherein both an upper bridge arm and a lower bridge arm of each of the plurality of switch bridge arms of the N-level AC-DC converter include a plurality of semiconductor devices connected in series, and a rated withstand voltage Vsemi of each of the semiconductor devices is greater than or equal to (Vbus ∗ δ)/((N-1) ∗ Nseries ∗ λ); and a second-stage converter having a first terminal electrically connected to the bus and a second terminal electrically connected to the load, and the second-stage converter being configured to convert the bus voltage into an output voltage to supply energy to the load. The technical solution of the present invention can reduce size and cost of the conversion device.
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公开(公告)号：EP3916975A3
公开(公告)日：2022-01-19
申请号：EP21171009.0
申请日：2021-04-28
发明人： LIU, Teng , YING, Jianping , QIAO, Lifeng , WANG, Xin , XIAO, Hongwei
IPC分类号： H02M1/00 , H02M1/088 , H02M3/00 , H02M3/335 , H02M5/458 , H02M7/08 , H02M7/23 , H02M7/48 , H02M7/487 , H02M7/493
摘要： Embodiments of the present invention provide a conversion device connected between an alternating current (AC) power grid and a load, wherein the conversion device comprises: an inductor electrically connected to the AC power grid; a first-stage converter having a first terminal electrically connected to the inductor and a second terminal electrically connected to a bus, and the first-stage converter being configured to output a bus voltage according to the AC power grid, wherein the first-stage converter comprises an N-level alternating current-direct current (AC-DC) converter, and the N-level AC-DC converter comprises a plurality of switch bridge arms, wherein both an upper bridge arm and a lower bridge arm of each of the plurality of switch bridge arms of the N-level AC-DC converter include a plurality of semiconductor devices connected in series, and a rated withstand voltage Vsemi of each of the semiconductor devices is greater than or equal to (Vbus ∗ δ)/((N-1) ∗ Nseries ∗ λ); and a second-stage converter having a first terminal electrically connected to the bus and a second terminal electrically connected to the load, and the second-stage converter being configured to convert the bus voltage into an output voltage to supply energy to the load. The technical solution of the present invention can reduce size and cost of the conversion device.
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公开(公告)号：EP3916980A1
公开(公告)日：2021-12-01
申请号：EP21170736.9
申请日：2021-04-27
发明人： LIU, Teng , YING, Jianping , QIAO, Lifeng , WANG, Xin , XIAO, Hongwei
摘要： A conversion device includes: an inductor (Lf) electrically connected to a AC power grid; a first-stage converter (302) configured to output a bus voltage based on the AC power grid; a second-stage converter (303) configured to convert the bus voltage into an output voltage to the load; and a filtering network, wherein a first resistance-capacitance circuit is disposed between the first and third terminals of the filtering network, a second resistance-capacitance circuit is disposed between the second and third terminals of the filtering network, the first terminal of the filtering network is electrically connected to the AC power grid, the second terminal of the filtering network is electrically connected to the bus or the second terminal of the second-stage converter, and the third terminal of the filtering network is grounded through a first capacitor.
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