Adjustable inductance loop suitable for multi-port electric energy router
By employing an adjustable inductor circuit structure in the power router and adjusting the spacing of the high-frequency busbars, the problem of stray inductance affecting power transmission is solved, achieving low-loss and stable power transmission.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-03-27
AI Technical Summary
Existing power routers, in medium-voltage and high-voltage high-power scenarios, have long loop paths that result in large stray inductances, which are difficult to calculate accurately and affect the stability and efficiency of power transmission.
An adjustable inductor circuit structure is adopted. The spacing of the high-frequency busbars is adjusted by a lifting mechanism to change the circuit inductance value. Combined with the leakage inductance of the high-frequency transformer, the inductance is adjustable, ensuring the stability and range of power transmission.
It reduces the losses of high-frequency transformers, improves overall efficiency, and enhances the stability and range of power transmission.
Smart Images
Figure CN121749689A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of AC / DC power distribution network technology, and specifically to an adjustable inductor circuit suitable for multi-port power routers. Background Technology
[0002] With the continuous development of power router technology, various topology schemes are now available. Among them, the power router with a common high-frequency AC bus aggregation scheme has broad application prospects due to its advantages such as less power conversion, high efficiency, and low cost.
[0003] These types of power routers typically employ a modular integrated structure and use the leakage inductance of the high-frequency transformer as the phase-shifting inductance required for power transmission. However, in practical engineering applications, especially in medium-voltage and high-voltage high-power scenarios, each phase of the AC port is housed in a separate cabinet, and all ports are connected via a common high-frequency bus. This results in a long loop path, making the stray inductance (hereinafter referred to as stray inductance) in the loop large and non-negligible.
[0004] Therefore, the existing topology has the following limitations: On the one hand, for the high-frequency transformer itself, the smaller its leakage inductance, the smaller the core loss. In order to meet the phase-shifting inductance required for power transmission, if the leakage inductance of the high-frequency transformer is deliberately increased in the early stage of design, although it can match the required phase-shifting inductance, it will lead to an increase in the loss of the high-frequency transformer, thereby reducing the efficiency of the entire converter. On the other hand, due to the presence of stray inductance in the circuit and the difficulty in calculating it accurately, there is a certain deviation between the leakage inductance of the high-frequency transformer, the stray inductance in the circuit and the phase-shifting inductance required for power transmission. The leakage inductance value of the high-frequency transformer is fixed after the completion of manufacturing and cannot be adjusted later, thus affecting the stability and range of power transmission. Summary of the Invention
[0005] This disclosure addresses the problems existing in the prior art by providing an adjustable inductance circuit suitable for power routers. It can minimize the leakage inductance of the high-frequency transformer, thereby reducing losses and improving overall efficiency. Furthermore, the circuit inductance can be adjusted through a lifting mechanism, thereby improving the stability and range of power transmission.
[0006] To achieve the above objectives, the technical solution adopted in this disclosure is as follows: This disclosure provides an adjustable inductor circuit suitable for multi-port power routers, including two high-frequency buses, N sets of lifting mechanisms, M ports, and M-1 reactors; wherein N is a positive integer and M is a positive integer greater than 1; the two high-frequency buses have the same width and thickness and are arranged parallel along the thickness direction; each port is connected through the two high-frequency buses; the reactors are connected in series between every two ports; the lifting mechanism includes an insulating screw, a fixed base, a lifting base, and a fixed plate; one end of the insulating screw is connected to one of the high-frequency buses through the fixed base, and the other end is connected to the fixed plate; the lifting base is sleeved on the insulating screw and is connected to the other high-frequency bus; the lifting base and the insulating screw can move relative to each other, so that the spacing between the two high-frequency buses is adjustable.
[0007] In one possible implementation, the port includes Z groups of modules connected in parallel, where Z is a positive integer; the modules include a support capacitor, an H-bridge structure, and a high-frequency transformer; the support capacitor is connected in parallel at both ends of the H-bridge structure; the two branches of the high-frequency transformer are respectively connected to the midpoints of the two half-bridges of the H-bridge structure.
[0008] In one possible implementation, the leakage inductance of the high-frequency transformer is designed to be 1~10μH.
[0009] In one possible implementation, the N value is set according to the length of the high-frequency busbar, and each set of lifting mechanisms is evenly distributed along the length direction of the high-frequency busbar.
[0010] In one possible implementation, any two ports are connected by two high-frequency buses and series reactors to form a dual active bridge for power transfer between ports.
[0011] In one possible implementation, the lifting seat is fitted with a nut that matches the thread of the insulating screw; by rotating the insulating screw, the lifting seat is driven to move linearly along the axial direction of the insulating screw, and the connected high-frequency busbars move synchronously to adjust the spacing between the two high-frequency busbars.
[0012] In one possible implementation, the adjustable spacing between the two high-frequency busbars is between the minimum spacing and the maximum spacing; the minimum spacing is the minimum safe insulation distance that meets the insulation requirements of the two high-frequency busbars; the maximum spacing is the spacing value corresponding to the first time the change in the stray inductance value corresponding to two adjacent spacing adjustments is less than 1% during the spacing adjustment process.
[0013] In one possible implementation, the fixing plate and the fixing seat are arranged in parallel, and the distance between the fixing plate and the fixing seat is greater than the maximum distance between the two high-frequency busbars.
[0014] In one possible implementation, the width of the high-frequency busbar is 50~200mm and the thickness is 5~20mm.
[0015] In one possible implementation, the high-frequency busbar is made of one of the following materials: T2 copper, oxygen-free copper, or copper-clad aluminum.
[0016] Compared with the prior art, this disclosure has the following beneficial effects: In the adjustable inductance circuit of this embodiment, a lifting mechanism consisting of an insulating screw, a fixed base, a fixed plate, and a lifting base allows one high-frequency busbar connected to the lifting base to move relative to another high-frequency busbar along the axial direction of the insulating screw, thereby directly changing the spacing between the two parallel high-frequency busbars. This change in spacing causes a change in the circuit's stray inductance value, achieving adjustable inductance and thus improving the stability and range of power transmission. Attached Figure Description
[0017] Figure 1 This is a partial structural diagram of an adjustable inductor circuit provided in an embodiment of this disclosure; Figure 2 This is a partial structural diagram of an adjustable inductor circuit provided in an embodiment of this disclosure; Figure 3 This is a partial structural diagram of an adjustable inductor circuit provided in an embodiment of this disclosure.
[0018] Explanation of reference numerals in the attached figures 10. High-frequency busbar; 20. Reactor; 30. Port; 51. Insulating screw; 52. Fixing base; 53. Lifting base; 54. Fixing plate. Detailed Implementation
[0019] The present disclosure will now be further described with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure and should not be construed as limiting the scope of protection of the present disclosure. It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application.
[0020] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.
[0021] refer to Figure 1 and Figure 3As shown, this embodiment of the present disclosure provides an adjustable inductor circuit suitable for a multi-port power router. The adjustable inductor circuit includes two high-frequency busbars 10, N sets of lifting mechanisms, M ports 30, and M-1 reactors 20; where N is a positive integer and M is a positive integer greater than 1; the two high-frequency busbars 10 have the same width and thickness and are arranged parallel along the thickness direction; each port 30 is connected through the two high-frequency busbars 10; the reactors 20 are connected in series between every two ports 30; the lifting mechanism includes an insulating screw 51, a fixed seat 52, a lifting seat 53, and a fixed plate 54; one end of the insulating screw 51 is connected to one of the high-frequency busbars 10 through the fixed seat 52, and the other end is connected to the fixed plate 54; the lifting seat 53 is sleeved on the insulating screw 51 and is connected to the other high-frequency busbar 10; the lifting seat 53 and the insulating screw 51 can move relative to each other, so that the spacing between the two high-frequency busbars 10 is adjustable.
[0022] In one possible implementation, the width of the high-frequency busbar is 50~200mm and the thickness is 5~20mm.
[0023] In one possible implementation, the high-frequency busbar is made of one of the following materials: T2 copper, oxygen-free copper, or copper-clad aluminum.
[0024] In one possible implementation, the N value is set according to the length of the high-frequency busbar, and each set of lifting mechanisms is evenly distributed along the length direction of the high-frequency busbar.
[0025] In one possible implementation, any two ports are connected by two high-frequency buses and series reactors to form a dual active bridge for power transfer between ports.
[0026] In one possible implementation, the lifting seat is fitted with a nut that matches the thread of the insulating screw; by rotating the insulating screw, the lifting seat is driven to move linearly along the axial direction of the insulating screw, and the connected high-frequency busbars move synchronously to adjust the spacing between the two high-frequency busbars.
[0027] In one possible implementation, the adjustable spacing between the two high-frequency busbars is between the minimum spacing and the maximum spacing; the minimum spacing is the minimum safe insulation distance that meets the insulation requirements of the two high-frequency busbars; the maximum spacing is the spacing value corresponding to the first time the change in the stray inductance value corresponding to two adjacent spacing adjustments is less than 1% during the spacing adjustment process.
[0028] In one possible implementation, the fixing plate and the fixing seat are arranged in parallel, and the distance between the fixing plate and the fixing seat is greater than the maximum distance between the two high-frequency busbars.
[0029] In one possible implementation, such as Figure 2As shown, port 30 includes Z groups of modules connected in parallel, where Z is a positive integer; the modules include a support capacitor, an H-bridge structure, and a high-frequency transformer; the support capacitor is connected in parallel at both ends of the H-bridge structure; the two branches of the high-frequency transformer are respectively connected to the midpoints of the two half-bridges of the H-bridge structure.
[0030] In one possible implementation, the leakage inductance of the high-frequency transformer is designed to be 1~10μH.
[0031] It should be noted that in the adjustable inductor circuit provided in this embodiment, the leakage inductance of the high-frequency transformer and the loop stray inductance are used together as the phase-shifting inductor for power transmission. Since the loop stray inductance is related to the length of the high-frequency busbar and the spacing between the two high-frequency busbars, the loop stray inductance of the adjustable inductor circuit can be changed by adjusting the spacing between the two high-frequency busbars through the relative movement of the lifting base and the insulating screw. Therefore, the leakage inductance of the high-frequency transformer can be pre-designed to a smaller value to reduce losses, and then the sum of the leakage inductance and the loop stray inductance can be precisely equal to the required phase-shifting inductance through fine-tuning of the spacing, achieving wide-range, low-loss, and stable power transmission.
[0032] To gain a more complete understanding of the adjustable inductor circuit of the embodiments of this disclosure, the circuit structure and adjustment principle will be further explained below in conjunction with its design method.
[0033] In the design of an adjustable inductor circuit, the first step is to use the formula P= The required phase-shifting inductance for power transmission between ports is determined by the formula: P represents the required power transmission between ports, n represents the turns ratio of the high-frequency transformer, U1 and U2 represent the voltages across the dual active bridge, D*(1-D) represents the phase shift ratio, f represents the frequency, and L represents the required phase-shifting inductance for power transmission between ports. It should be noted that the loop inductance Ls is equal to the phase-shifting inductance L minus the leakage inductance Lm of the high-frequency transformer. The minimum length of the high-frequency busbar and the minimum spacing between the two high-frequency busbars are determined based on the number and location of the ports. The minimum spacing is equal to the minimum insulation distance between the two high-frequency busbars. The spacing between the two high-frequency busbars is initially set to the minimum spacing and increased sequentially by 10mm. After each spacing adjustment, the loop inductance value is estimated using finite element analysis until the change in inductance value is less than 1%. The spacing value at this point is recorded as the maximum spacing value. The optimal spacing between the two high-frequency buses is determined by taking the midpoint distance as the center distance. The stray inductance of the two buses is estimated at this point, and the difference between this stray inductance and the phase-shifting inductance is calculated. By gradually increasing the length of the two high-frequency buses, it is determined whether the stray inductance and the phase-shifting inductance are equal. If they are equal, the current bus length is the optimal length. If the bus length cannot be increased, and the stray inductance still cannot meet the phase-shifting inductance requirement, a series reactor is connected between each pair of terminals based on the shortest possible bus length to meet the phase-shifting inductance requirement. The above adjustable inductance circuit is now complete in design, production, and assembly. Its circuit path and the leakage inductance of the high-frequency transformer are determined according to the formula P = ... It can be seen that, through testing, when the shift ratio is at its maximum, it is determined whether the power has reached the design value. If it is less than the design value, the lifting mechanism is used to sequentially reduce the distance between the two high-frequency busbars by 10mm intervals, that is, to reduce the circuit inductance value, until the power meets the design value. If it is greater than the design value, the lifting mechanism is used to sequentially increase the distance between the two high-frequency busbars by 10mm intervals, that is, to increase the circuit inductance value, until the power meets the design value.
[0034] The above technical solution reduces the loss of the high-frequency transformer and improves the efficiency of the entire system by using loop inductance to replace the leakage inductance of the high-frequency transformer. By making the loop inductance adjustable, the phase-shifting inductance in the power transmission process can be accurately located, thereby improving the stability and range of power transmission.
[0035] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values set forth in these embodiments should be interpreted as exemplary only and not as limiting.
[0036] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0037] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "including" or "contains" mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility of covering other elements as well.
[0038] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.
[0039] Finally, it should be noted that the above content is only used to illustrate the technical solution of this disclosure, and is not intended to limit the scope of protection of this disclosure. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this disclosure do not depart from the substance and scope of the technical solution of this disclosure.
Claims
1. An adjustable inductor circuit suitable for multi-port power routers, characterized in that, It includes two high-frequency busbars, N sets of lifting mechanisms, M ports, and M-1 reactors; where N is a positive integer and M is a positive integer greater than 1; the two high-frequency busbars have the same width and thickness and are arranged parallel to each other along the thickness direction; each port is connected through the two high-frequency busbars; the reactors are connected in series between every two ports; The lifting mechanism includes an insulating screw, a fixed base, a lifting base, and a fixed plate; one end of the insulating screw is connected to one of the high-frequency busbars through the fixed base, and the other end is connected to the fixed plate; the lifting base is sleeved on the insulating screw and is connected to the other high-frequency busbar; the lifting base and the insulating screw can move relative to each other, so that the spacing between the two high-frequency busbars is adjustable.
2. The adjustable inductor circuit as described in claim 1, characterized in that, The port includes Z groups of modules connected in parallel, where Z is a positive integer; each module includes a supporting capacitor, an H-bridge structure, and a high-frequency transformer; the supporting capacitor is connected in parallel at both ends of the H-bridge structure; the two branches of the high-frequency transformer are respectively connected to the midpoints of the two half-bridges of the H-bridge structure.
3. The adjustable inductor circuit as described in claim 2, characterized in that, The leakage inductance of the high-frequency transformer is designed to be 1~10μH.
4. The adjustable inductor circuit as described in claim 1, characterized in that, The N value is set according to the length of the high-frequency busbar, and each group of lifting mechanisms is evenly distributed along the length direction of the high-frequency busbar.
5. The adjustable inductor circuit as described in claim 1, characterized in that, Any two ports are connected by two high-frequency buses and a series reactor to form a dual active bridge for power transmission between ports.
6. The adjustable inductor circuit as described in claim 1, characterized in that, The lifting seat is fitted with a nut that matches the thread of the insulating screw; by rotating the insulating screw, the lifting seat is driven to move linearly along the axial direction of the insulating screw, and the connected high-frequency busbars move synchronously to adjust the spacing between the two high-frequency busbars.
7. The adjustable inductor circuit as described in claim 1, characterized in that, The adjustable spacing between the two high-frequency busbars is between the minimum spacing and the maximum spacing; the minimum spacing is the minimum safe insulation distance that meets the insulation requirements of the two high-frequency busbars; the maximum spacing is the spacing value corresponding to the first time the change in the stray inductance value corresponding to two adjacent spacing adjustments is less than 1% during the spacing adjustment process.
8. The adjustable inductor circuit as described in claim 7, characterized in that, The fixing plate is arranged parallel to the fixing seat, and the distance between the fixing plate and the fixing seat is greater than the maximum distance between the two high-frequency busbars.
9. The adjustable inductor circuit as described in claim 1, characterized in that, The width of the high-frequency busbar is 50~200mm and the thickness is 5~20mm.
10. The adjustable inductor circuit as described in claim 1, characterized in that, The high-frequency busbar is made of one of the following materials: T2 copper, oxygen-free copper, or copper-clad aluminum.