Current balancing in power semiconductors of DC / DC converters
By using split resonant capacitors or split energy transfer inductors in DC/DC converters, the problem of uneven current distribution in semiconductor switches is solved, the efficiency and performance of the converter are improved, and the manufacturing difficulty and cost are reduced.
Patent Information
- Application Number
- CN202080065404.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2019-09-20
- Filing Date
- 2020-09-18
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2040-09-18
AI Technical Summary
In DC/DC converters, achieving uniform current distribution across multiple semiconductor switches is difficult, especially in high-frequency switching and wide-bandgap semiconductor applications, resulting in uneven losses and degraded performance.
By adopting the design of split resonant capacitor or split energy transfer inductor, the current distribution of each semiconductor switch is defined by the resonant circuit and the split capacitor/inductor, avoiding circulating current and achieving uniform current distribution.
Uniform current distribution in semiconductor switches at high-frequency switching is achieved, which reduces losses, improves converter efficiency and performance, and reduces manufacturing complexity and cost.
Smart Images
Figure CN114514683B_ABST
Abstract
Claims
1. A DC / DC converter, comprising: a) A first DC link (10); b) A first plurality of N>1 converter bridges, connected in parallel to the first DC link; c) A transformer having a primary side and a secondary side; d) Characterized in that the primary side of the transformer includes a plurality of M>1 primary windings, each of the plurality of primary windings having a first terminal and a second terminal; e) The converter further includes a first plurality of N impedance elements and a second plurality of M impedance elements, wherein, f) For each converter bridge, different impedance elements from the first plurality of impedance elements are connected between the converter bridge and a common node (C); and g) Each impedance element of the second plurality of M impedance elements is connected between the common node and the first terminal of a different one of the plurality of primary windings.
2. The DC / DC converter according to claim 1, wherein the first DC link (10) includes a first DC link capacitor.
3. The DC / DC converter according to claim 1, wherein the transformer is an intermediate frequency transformer (2141).
4. The DC / DC converter according to claim 1, wherein each converter bridge in the converter bridges is an inverter half-bridge including a first input terminal and a second input terminal and an inverter bridge output, and for each inverter half-bridge, different impedance elements of the first plurality of impedance elements are connected in series with the inverter bridge output.
5. The DC / DC converter according to claim 1, wherein the DC / DC converter further includes: a) A plurality of O common nodes, where O<N and O<M, and wherein, b) Each impedance element of the first plurality of N impedance elements is connected between one of the converter bridges and one of the common nodes; c) Each impedance element of the second plurality of M impedance elements is connected between one of the common nodes and the first terminal of a different one of the plurality of primary windings.
6. The DC / DC converter according to claim 1, wherein the primary side of the transformer includes a plurality of N primary windings, each of the plurality of primary windings having a first terminal and a second terminal; wherein the converter bridges and the primary windings are connected in pairs via different impedance elements from the first plurality of impedance elements, and the different impedance elements from the first plurality of impedance elements are connected to the first terminal of the corresponding primary winding from the plurality of primary windings.
7. The DC / DC converter according to claim 1, wherein: a) Each converter bridge in the converter bridges is an inverter half-bridge including a first input terminal and a second input terminal and an inverter bridge output, b) Each impedance element has a first terminal and a second terminal, and wherein, c) For each inverter half-bridge, the first terminal of each impedance element of the corresponding impedance elements of the plurality of impedance elements is connected to the corresponding inverter bridge output, and d) the second terminals of all impedance elements from the first plurality of N impedance elements are connected together at the common node.
8. The DC / DC converter according to claim 6, wherein: a) each of the converter bridges is an inverter half-bridge comprising a first input terminal and a second input terminal, an inverter bridge, b) each impedance element has a first terminal and a second terminal, and wherein, c) for each inverter half-bridge, the first terminal of each impedance element of a corresponding impedance element of the plurality of impedance elements is connected to a corresponding inverter bridge output, and d) The second terminal of each of the impedance elements from the first plurality of N impedance elements is connected to a different primary winding. 9 . The DC / DC converter of claim 3 , wherein the second terminals of all primary windings of the plurality of primary windings are connected together. 10 . The DC / DC converter according to claim 1 , wherein the converter is a resonant converter, and each of the plurality of impedance elements is a capacitor. 11 . The DC / DC converter of claim 1 , wherein the converter is a dual active bridge converter, and each impedance element of the plurality of impedance elements is an inductor.
12. The DC / DC converter according to any one of claims 1 to 11, further comprising: a) a second DC link; b) a second plurality N′>1 converter bridges connected in parallel with the second DC link; c) the secondary side of the transformer comprises at least one secondary winding; d) The converter further comprises a third plurality N' of impedance elements, wherein: e) For each converter bridge from said second plurality N′>1 converter bridges, a different impedance element from said third plurality of impedance elements is connected between said converter bridge and said at least one secondary winding.
13. The DC / DC converter of claim 12, wherein the second DC link comprises a second DC link capacitor.
14. The DC / DC converter according to any one of claims 1 to 11, wherein: a) each converter bridge of said first plurality N>1 converter bridges is an inverter bridge; b) the secondary side of the transformer comprises at least one secondary winding; the converter further comprises: c) a second DC link (18); d) a second plurality N′>1 rectifier bridges connected in parallel with the second DC link; e) a third plurality N' of impedance elements, wherein: f) For each rectifier bridge, a different impedance element from said third plurality of impedance elements is connected between said rectifier bridge and said at least one secondary winding.
15. The DC / DC converter according to claim 14, wherein the second DC link (18) comprises a second DC link capacitor.
16. The DC / DC converter according to any one of claims 12, wherein: a) the secondary side of the transformer comprises a plurality of M′>1 secondary windings, each of the plurality of secondary windings having a first terminal and a second terminal; b) a fourth plurality M' of impedance elements; and wherein: c) each impedance element of the third plurality N′ impedance elements is connected between one of the converter bridges and another common node; d) Each impedance element of the fourth plurality M′ impedance elements is connected between the further common node and the first terminal of a different secondary winding of the plurality of secondary windings.
17. The DC / DC converter according to any one of claims 1 to 11, further comprising: a) a second DC link; b) a second plurality N′>1 converter bridges connected in parallel with the second DC link; c) a third plurality of impedance elements; and d) the secondary side of the transformer comprises a plurality of N′ secondary windings, each of the plurality of secondary windings having a first terminal and a second terminal; wherein the converter bridge and the secondary windings are connected in pairs via different impedance elements from the third plurality of impedance elements, the different impedance elements from the third plurality of impedance elements being connected to the first terminals of corresponding secondary windings from the plurality of secondary windings.
18. The DC / DC converter of claim 17, wherein the second DC link comprises a second DC link capacitor.
19. The DC / DC converter according to any one of claims 1-11, wherein the converter bridges of the first plurality N>1 converter bridges are active bridges configured to operate in a synchronous manner.
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