Cascaded single-phase AC-to-DC isolation converter
A technology of DC isolation and single-phase AC, which is applied in the direction of conversion of DC power input to DC power output, AC power input into DC power output, and output power conversion device, which can solve the problem of large occupied volume and achieve reduction Equipment volume, DC bias prevention, and cost reduction effects
Active Publication Date: 2020-02-14
INNER MONGOLIA POWER GRP
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Problems solved by technology
However, a large-capacity capacitor at the DC output end of the first-stage AC-DC conversion link provides voltage support, which occupies a large volume
Method used
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Embodiment 2
[0032] Embodiment 2: On the basis of Embodiment 1, each module adopts the same modulation scheme and duty ratio modulation wave, so that when the parameters of each AC-DC isolation converter module are similar, each module has an automatic voltage equalization characteristic, that is, each module The module input voltage is the same.
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The invention discloses a cascaded single-phase AC-to-DC isolation converter. The cascaded single-phase AC-to-DC isolation converter is formed by connecting the input sides of a plurality of AC-to-DCisolation converter modules in series and connecting the output sides of the AC-to-DC isolation converter modules in parallel. The input-side full-bridge structures of the modules provide a basis forsingle-stage AC / DC conversion. Through input-side and output-side full-bridge modulation strategies and a reasonable control method, the functions of DC stable output and power factor adjustment are realized. The converter and the control method overcome the defect that the output capacitance of the first-stage direct-current end of a two-stage AD / DC converter is large, and the size and the weightof the cascaded single-phase AC-to-DC isolation converter are reduced.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to a cascaded single-phase AC-to-DC isolation converter. Background technique [0002] Traction converters used in trains, subways, vehicles and other fields need to have the function of converting medium-voltage AC to low-voltage DC. Conventional traction converter equipment is implemented using low frequency transformers. Low frequency transformers are huge and heavy. When the converter device with the low frequency transformer has a high current density, the low frequency transformer efficiency will decrease. In order to overcome this problem, it has become a trend to study AC-DC converters using high-frequency links, and to reduce the weight and volume of these converters. [0003] Existing AC-DC converters with high-frequency links used in medium-voltage power grids use AC / DC / DC two-stage conversion. However, a large-capacity capacitor at the DC output end of the fi...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M3/335H02M7/219
CPCH02M3/33523H02M3/33569H02M7/219
Inventor 韩俊飞杨宝峰王宇强钟鸣俞超宇
Owner INNER MONGOLIA POWER GRP
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