Power supply equipment of double-active-bridge direct-current converter power assembly
By reducing the number of isolation transformers and centrally installing secondary coils, the problems of high cost and large space in the prior art are solved, and the effects of cost reduction and space saving are achieved.
Patent Information
- Application Number
- CN202421639355.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-11
AI Technical Summary
In the prior art, the power supply equipment of dual active bridge DC converters requires multiple sets of isolated transformers, resulting in high cost and large space occupancy.
Four sets of isolation transformers are adopted. The primary side of each set of isolation transformers contains a primary coil, and the secondary side contains N≥5 secondary coils isolated from each other. The four secondary coils are connected to the power component through energy-taking power supply and bridge arm driver. The remaining coils are left unloaded and the coils are centrally installed in the closed isolation box.
Reduces the number of isolation transformers, reduces the cost of power supply equipment, and effectively reduces the space and simplifies the wiring process.
Smart Images
Figure CN223141526U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of flexible DC power transmission, and more specifically, relates to a power supply device for a power component of a dual-active-bridge DC converter. Background Art
[0002] A DC transformer is an indispensable main device in a flexible DC power grid system, and is mainly applied in fields such as photovoltaic power generation, uninterruptible power supply, and distributed power stations. For a DC transformer adopting a topology structure of a dual-active-bridge DC converter based on device series connection, the potentials of its power components are inconsistent, and it cannot obtain energy by itself through a capacitor, and needs to be powered by an external power supply.
[0003] In the prior art, a power supply device composed of multiple groups of isolation transformers is usually adopted to supply power to the power components of a dual-active-bridge DC converter. The potential of the isolation transformer is consistent with the potential of each series-connected power component, and each AC / DC power module is powered separately. The disadvantages of the prior art are that the number of isolation transformers required is large and the cost is high. Summary of the Utility Model
[0004] To solve the deficiencies existing in the prior art, the utility model provides a power supply device for a power component of a dual-active-bridge DC converter for device series connection, which reduces the number of isolation transformers.
[0005] The utility model adopts the following technical solutions.
[0006] The utility model provides a power supply device for a power component of a dual-active-bridge DC converter, comprising:
[0007] 4 groups of isolation transformers, each group of isolation transformers has a primary side including 1 primary coil and a secondary side including N≥5 mutually isolated secondary coils, wherein 4 secondary coils are connected to the power components of the dual-active-bridge DC converter through an energy-taking power supply and a bridge arm driver, and the remaining secondary coils are reserved for no-load.
[0008] Preferably, the 4 groups of isolation transformers have the same structure and specifications, and there is spatial isolation between all coils of each group of isolation transformers, and they are coupled through mutual inductance.
[0009] Preferably, each group of isolation transformers has 5 secondary coils on the secondary side; one group of isolation transformers (171) includes a first primary coil (1711), a second secondary coil (1712), a third secondary coil (1713), a fourth secondary coil (1714), a fifth secondary coil (1715), and a sixth secondary coil (1716).
[0010] Preferably, the isolation voltage between any secondary side coil and other secondary side coils of the isolation transformer is the highest system voltage, and the isolation voltage between the primary side coil and all secondary side coils of the secondary side is the highest system voltage. The highest system voltage is the input voltage of the high voltage side when the dual active bridge DC converter operates at rated conditions.
[0011] Preferably, the isolation voltage is 10 kV.
[0012] Preferably, the primary side coil is connected to the mains power supply.
[0013] Preferably, the outgoing line of the secondary side coil is connected to the 220 V input terminal of the energy-taking power supply through a high-voltage insulating wire.
[0014] Preferably, the primary side coil and the secondary side coil of the isolation transformer are concentrated in a closed isolation box.
[0015] Preferably, the isolation box is provided with an installation base, a heat dissipation layer is arranged on the outside, and there are 4 installation holes at the bottom of the installation base.
[0016] Preferably, the live wire outgoing terminal (A) of the first primary side coil and the neutral wire outgoing terminal (N) of the first primary side coil are distributed at the central position on the side of the installation base. Among the 5 secondary winding outgoing terminals, the live wire outgoing terminals (2a) to (5a) of the third to sixth secondary side coils and the corresponding neutral wire outgoing terminals (2n) to (5n) of the third to sixth secondary side coils are arranged in pairs and distributed at the central position on the top of the isolation box. The live wire outgoing terminal (1a) and the neutral wire outgoing terminal (1n) of the second secondary side coil are respectively located at both ends of the horizontal axis on the top of the isolation box.
[0017] Compared with the prior art, the beneficial effects of the present utility model at least include:
[0018] 1) Reduce the number of isolation transformers and effectively reduce the power supply design cost.
[0019] 2) The secondary side coils of the isolation transformer are centrally installed, effectively reducing the space occupied by the entire power supply device.
[0020] 3) The wiring on the secondary side is more convenient. Description of the Drawings
[0021] Figure 1 is the topological structure diagram of the dual active bridge DC converter;
[0022] Figure 2 is the structure diagram of the conventional isolation power supply device;
[0023] Figure 3 is the structure diagram of the power supply device for the power component of the dual active bridge DC converter provided by the present utility model;
[0024] Figure 4 Three - view drawings of a power supply device for a power component of a dual - active - bridge DC converter provided by the present utility model.
[0025] In the figure: 11, the first isolation transformer; 21, the second isolation transformer; 31, the third isolation transformer; 41, the fourth isolation transformer; 51, the fifth isolation transformer; 61, the sixth isolation transformer; 71, the seventh isolation transformer; 81, the eighth isolation transformer; 91, the ninth isolation transformer; 101, the tenth isolation transformer; 111, the eleventh isolation transformer; 121, the twelfth isolation transformer; 131, the thirteenth isolation transformer; 141, the fourteenth isolation transformer; 151, the fifteenth isolation transformer; 161, the sixteenth isolation transformer; 171, the seventeenth isolation transformer; 181, the eighteenth isolation transformer; 191, the nineteenth isolation transformer; 201, the twentieth isolation transformer; 12, the first energy - taking power supply; 22, the second energy - taking power supply; 32, the third energy - taking power supply; 42, the fourth energy - taking power supply; 52, the fifth energy - taking power supply; 62, the sixth energy - taking power supply; 72, the seventh energy - taking power supply; 82, the eighth energy - taking power supply; 92, the ninth energy - taking power supply; 102, the tenth energy - taking power supply; 112, the eleventh energy - taking power supply; 122, the twelfth energy - taking power supply; 132, the thirteenth energy - taking power supply; 142, the fourteenth energy - taking power supply; 152, the fifteenth energy - taking power supply; 162, the sixteenth energy - taking power supply; 13, the first upper - left bridge - arm driver; 23, the second upper - left bridge - arm driver; 33, the third upper - left bridge - arm driver; 43, the fourth upper - left bridge - arm driver; 53, the first lower - left bridge - arm driver; 63, the second lower - left bridge - arm driver; 73, the third lower - left bridge - arm driver; 83, the fourth lower - left bridge - arm driver; 93, the first upper - right bridge - arm driver; 103, the second upper - right bridge - arm driver; 113, the third upper - right bridge - arm driver; 123, the fourth upper - right bridge - arm driver; 133, the first lower - right bridge - arm driver; 143, the second lower - right bridge - arm driver; 153, the third lower - right bridge - arm driver; 163, the fourth lower - right bridge - arm driver; 1711, the first primary coil; 1712, the second secondary coil; 1713, the third secondary coil; 1714, the fourth secondary coil; 1715, the fifth secondary coil; 1716, the sixth secondary coil; A, the live wire outlet terminal of the first primary coil; N, the neutral wire outlet terminal of the first primary coil; 1a, the live wire outlet terminal of the second secondary coil; 1n, the neutral wire outlet terminal of the second secondary coil; 2a, the live wire outlet terminal of the third secondary coil; 2n, the neutral wire outlet terminal of the third secondary coil; 3a, the live wire outlet terminal of the fourth secondary coil; 3n, the neutral wire outlet terminal of the fourth secondary coil; 4a, the live wire outlet terminal of the fifth secondary coil; 4n, the neutral wire outlet terminal of the fifth secondary coil; 5a, the live wire outlet terminal of the sixth secondary coil; 5n, the neutral wire outlet terminal of the sixth secondary coil. Detailed implementation manners
[0026] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments of this application are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the spirit of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.
[0027] Embodiment 1 of the present utility model provides a power supply device for a dual-active-bridge DC converter power component.
[0028] As Figure 1 shown, the topology of the dual-active-bridge DC converter (DAB) with device series connection is as Figure 1 shown. The high-voltage side consists of 4 bridge arms, and each bridge arm is composed of 4 power components connected in series. The input voltage on the high-voltage side (primary DC bus voltage) is 10 kV DC voltage, and the output voltage on the low-voltage side is 750 V DC voltage. During the operation of the dual-active-bridge DC converter, the maximum withstand voltage of each bridge arm on the high-voltage side is 10 kV of the primary DC bus voltage. Before a single bridge arm conducts, each series-connected power component is at a different potential. Therefore, the power supply for each power component needs to be isolated from each other. Since there is no energy-taking magnetic ring on the power device drive board, an isolated power supply form is adopted.
[0029] As Figure 2 shown, a conventional isolated power supply device includes 16 groups of isolation transformers: the first isolation transformer 11, the second isolation transformer 21, the third isolation transformer 31, the fourth isolation transformer 41, the fifth isolation transformer 51, the sixth isolation transformer 61, the seventh isolation transformer 71, the eighth isolation transformer 81, the ninth isolation transformer 91, the tenth isolation transformer 101, the eleventh isolation transformer 111, the twelfth isolation transformer 121, the thirteenth isolation transformer 131, the fourteenth isolation transformer 141, the fifteenth isolation transformer 151, and the sixteenth isolation transformer 161; the primary coils of each group of isolation transformers are connected to the mains, and the secondary coils are respectively connected to the corresponding 16 bridge arm drivers, the first upper left bridge arm driver 13 to the fourth lower right bridge arm driver 163, through 16 independent energy-taking power supplies, the first energy-taking power supply 12 to the sixteenth energy-taking power supply 162. The bridge arm driver refers to the driving device of the switching tube in the power component. The potential of the isolation transformer is kept consistent with the potential of each series-connected power component to supply power to each power component separately. Multiple isolation transformers are required, resulting in a relatively high cost.
[0030] As Figure 3As shown in the figure, a power supply device for a power component of a dual-active-bridge DC converter provided by the present utility model includes 4 groups of isolation transformers: the seventeenth isolation transformer 171, the eighteenth isolation transformer 181, the nineteenth isolation transformer 191, and the twentieth isolation transformer 201.
[0031] Preferably, the 4 groups of isolation transformers adopt the same structure and specifications. Taking the seventeenth isolation transformer 171 as an example, it includes a first primary coil 1711, a second secondary coil 1712, a third secondary coil 1713, a fourth secondary coil 1714, a fifth secondary coil 1715, and a sixth secondary coil 1716. There is spatial isolation between all coils, and they are coupled by mutual inductance.
[0032] Further preferably, the primary side of the seventeenth isolation transformer 171 includes 1 primary coil, the first primary coil 1711, which is connected to the mains power supply; the secondary side of the seventeenth isolation transformer 171 includes 5 mutually isolated secondary coils. Among them, the first 4 secondary coils, the second secondary coil 1712, the third secondary coil 1713, the fourth secondary coil 1714, and the fifth secondary coil 1715 respectively supply isolated power to the power components of each arm by connecting to the energy-taking power supply and the arm driver, and the last 1 sixth secondary coil 1716 is reserved for no-load. The outgoing line of each secondary coil is connected to the 220V input terminal of its respective energy-taking power supply through a high-voltage insulated wire.
[0033] It should be noted that on the premise of meeting the requirements of the actual working conditions, any N≥5 mutually isolated secondary coils can be selected, among which 4 supply isolated power to the power components of each arm, and the remaining coils are reserved for no-load. Based on the spirit of the present utility model, they should all fall within the protection scope of the present utility model.
[0034] Preferably, the isolation voltage between any secondary coil on the secondary side of the isolation transformer and other secondary coils is the highest system voltage, and the isolation voltage between the primary coil on the primary side and all secondary coils on the secondary side is also the highest system voltage. The highest system voltage is the input voltage of the high-voltage side during the rated operation of the dual-active-bridge DC converter. Specifically, the isolation voltage between secondary coils is designed according to the highest system voltage of 10kV, and the isolation voltage between the primary coil and the secondary coil also needs to be 10kV of the system voltage.
[0035] Such as Figure 4The three views of a set of isolation transformers of the present utility model are shown. The primary coil (winding) and the secondary coil (winding) of the isolation transformer are concentrated in a closed isolation box. An installation base is provided under the isolation box, and a heat dissipation layer is provided on the outside. There are 4 installation holes at the bottom of the installation base. The live wire outlet end A and the neutral wire outlet end N of the primary winding are distributed at the central positions on the side of the installation base. Among the 5 secondary winding outlet ends, the live wire outlet end 2a of the third secondary coil to the live wire outlet end 5a of the sixth secondary coil and the corresponding neutral wire outlet end 2n of the third secondary coil to the live wire outlet end 5n of the sixth secondary coil are arranged in pairs and distributed at the central position on the top of the isolation box. The live wire outlet end 1a and the live wire outlet end 1n of the second secondary coil are respectively located at both ends of the horizontal axis on the top of the isolation box.
[0036] Compared with the prior art, the beneficial effects of the present utility model at least include:
[0037] 1) Reduce the number of isolation transformers and effectively reduce the power supply design cost.
[0038] 2) The secondary coils of the isolation transformers are centrally installed, effectively reducing the space occupied by the entire power supply device.
[0039] 3) The secondary side wiring is more convenient.
[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present utility model can still be modified or equivalently replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present utility model shall be covered by the protection scope of the claims of the present utility model.
Claims
1. A power supply device for a power component of a dual-active-bridge DC converter, characterized in that, Including: 4 groups of isolation transformers, the primary side of each group of isolation transformers includes 1 primary coil, and the secondary side includes N≥5 mutually isolated secondary coils. Among them, 4 secondary coils are connected to the power components of the dual-active-bridge DC converter through an energy-taking power supply and a bridge arm driver, and the remaining secondary coils are on no-load standby.
2. The power supply device for the power components of the dual-active-bridge DC converter according to claim 1, characterized in that: The 4 groups of isolation transformers have the same structure and specifications, and there is spatial isolation between all coils of each group of isolation transformers, and they are coupled through mutual inductance.
3. The power supply device for the power components of the dual-active-bridge DC converter according to claim 2, characterized in that: Each group of isolation transformers on the secondary side includes 5 secondary coils; one group of isolation transformers (171) includes a first primary coil (1711), a second secondary coil (1712), a third secondary coil (1713), a fourth secondary coil (1714), a fifth secondary coil (1715), and a sixth secondary coil (1716).
4. The power supply device for the power components of the dual-active-bridge DC converter according to any one of claims 1-3, characterized in that: The isolation voltage between any secondary coil on the secondary side of the isolation transformer and other secondary coils is the highest system voltage, and the isolation voltage between the primary coil on the primary side and all secondary coils on the secondary side is the highest system voltage. The highest system voltage is the input voltage of the high-voltage side when the dual-active-bridge DC converter operates at rated conditions.
5. The power supply device for the power components of the dual-active-bridge DC converter according to claim 4, characterized in that: The isolation voltage is 10 kV.
6. The power supply device for the power components of the dual-active-bridge DC converter according to claim 1, characterized in that: The primary coil is connected to the mains.
7. The power supply device for the power components of the dual-active-bridge DC converter according to claim 1, characterized in that: The outgoing line of the secondary coil is connected to the 220V input end of the energy-taking power supply through a high-voltage insulating wire.
8. The power supply device for the power components of the dual-active-bridge DC converter according to claim 3, characterized in that: The primary coil and secondary coil of the isolation transformer are concentrated in a closed isolation box.
9. The power supply device for the power components of the dual-active-bridge DC converter according to claim 8, characterized in that: The isolation box is provided with a mounting base below, a heat dissipation layer on the outside, and 4 mounting holes at the bottom of the mounting base.
10. The power supply device for the power components of the dual-active-bridge DC converter according to claim 9, characterized in that: The live wire outgoing end (A) and the neutral wire outgoing end (N) of the first primary coil are distributed at the central position on the side of the mounting base. Among the outgoing ends of the 5 secondary windings, the live wire outgoing ends (2a) to (5a) of the third secondary coil to the sixth secondary coil and the corresponding neutral wire outgoing ends (2n) to (5n) of the third secondary coil to the sixth secondary coil are arranged in pairs and distributed at the central position on the top of the isolation box, and the live wire outgoing end (1a) and the neutral wire outgoing end (1n) of the second secondary coil are respectively located at both ends of the horizontal axis on the top of the isolation box.