X-ray imaging apparatus and power distribution unit therefor, wireless power transfer device

Abstract

This disclosure provides an X-ray imaging device and its power distribution unit and wireless power transmission device. The power distribution unit includes: a first rectifier circuit, a charging circuit, an energy storage module, and a first inverter circuit; the input terminals of both the first rectifier circuit and the charging circuit are connected to the external power grid; the output terminal of the first rectifier circuit is connected to the input terminal of the first inverter circuit, and the output terminal of the first inverter circuit is connected to the wireless power transmission device of the X-ray imaging device; the output terminal of the charging circuit is connected to one end of the energy storage module, and the other end of the energy storage module is connected to the input terminal of the first inverter circuit. In this disclosure, the power supply from the power grid and the power supply from the energy storage module are in parallel, which can reduce the imaging device's demand on the power grid capacity. Since the charging circuit only participates in the charging process of the energy storage module and does not participate in the discharging process of the energy storage module, it can realize simultaneous charging and discharging of the energy storage module, and there are no excessive requirements on the power level of the charging circuit, which can reduce the cost of the charging circuit.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an X-ray imaging device and its power distribution unit and wireless power transmission device. Background Technology

[0002] In recent years, X-ray computed tomography (CT) has made tremendous progress in both its basic technology and new clinical applications, becoming one of the most exciting diagnostic methods in the field of medical imaging. X-ray CT requires the transfer of electrical energy between the stator and rotor. Traditional slip rings, using contact carbon brushes, suffer from problems such as easy deformation under high and low temperature operating conditions, difficulty in integrated molding, and the tendency to accumulate dust, carbon deposits, and heat during high-speed operation. Non-contact slip rings, employing wireless power transmission technology, transform power transmission from power frequency conduction to high-frequency magnetic coupling, overcoming the shortcomings of traditional carbon brush slip rings and representing a current focus of technological research.

[0003] For CTs employing wireless power transmission devices, the power distribution unit (PDU) supplies power to the wireless power transmission devices. See also Figure 1 To address the issue of insufficient grid capacity at the installation site, an energy storage unit was added to the power distribution unit. If the energy storage unit is charged via a rectifier circuit and a bidirectional DC / DC converter, both charging and discharging occur through the bidirectional DC / DC converter. This not only prevents simultaneous charging and discharging but also requires that the bidirectional DC / DC converter's power output be at least equal to the sum of the power outputs of all power components when the energy storage unit discharges to them. For example, if the power components include a first inverter circuit and a second inverter circuit, the bidirectional DC / DC converter's power output must be at least equal to the sum of the power outputs of the first inverter circuit (in the hundreds of kW range) and the second inverter circuit (in the tens of kW range). This high power requirement significantly increases the design complexity and cost of the bidirectional DC / DC converter. Summary of the Invention

[0004] The technical problem to be solved by this disclosure is to overcome the above-mentioned defects in the prior art and to provide an X-ray imaging device and its power distribution unit and wireless power transmission device.

[0005] This disclosure solves the above-mentioned technical problems through the following technical solution:

[0006] In a first aspect, a power distribution unit is provided for use in an X-ray imaging device, the X-ray imaging device further comprising a wireless power transmission device; the power distribution unit comprises: a first rectifier circuit, a charging circuit, an energy storage module, and a first inverter circuit;

[0007] The input terminals of both the first rectifier circuit and the charging circuit are connected to the external power grid; the output terminal of the first rectifier circuit is connected to the input terminal of the first inverter circuit, and the output terminal of the first inverter circuit is connected to the wireless power transmission device; the output terminal of the charging circuit is connected to one end of the energy storage module, and the other end of the energy storage module is connected to the input terminal of the first inverter circuit.

[0008] The first inverter circuit is used to convert the DC voltage into AC voltage and output it to the wireless power transmission device.

[0009] Optionally, in response to the grid capacity being greater than a capacity threshold, the first rectifier circuit rectifies the AC voltage provided by the grid and outputs a DC voltage to the first inverter circuit; and the charging circuit charges the energy storage module.

[0010] In response to the grid capacity being less than or equal to a capacity threshold, the energy storage module outputs a DC voltage to the first inverter circuit;

[0011] Optionally, the energy storage module includes: a rechargeable battery, a bidirectional DC / DC converter, and a supercapacitor;

[0012] The input terminal of the rechargeable battery is connected to the output terminal of the charging circuit; the output terminal of the rechargeable battery is connected to one end of the supercapacitor through the bidirectional DC / DC converter, and the other end of the supercapacitor is connected to the input terminal of the first inverter circuit.

[0013] Optionally, the power distribution unit further includes: a first switch, the input terminal of the charging circuit being connected to the external power grid through the first switch; the control terminal of the first switch being connected to the battery management system included in the power distribution unit;

[0014] And / or, the energy storage module further includes: a second switch, one end of the rechargeable battery being connected to the output terminal of the charging circuit via the second switch; the control terminal of the second switch being connected to the battery management system included in the power distribution unit;

[0015] And / or, the energy storage module further includes: a third switch, the other end of the rechargeable battery being connected to the bidirectional DC / DC converter via the third switch; the control terminal of the third switch being connected to the battery management system included in the power distribution unit;

[0016] And / or, the energy storage module further includes: a fourth switch, wherein the bidirectional DC / DC converter is connected to one end of the supercapacitor via the fourth switch; the control terminal of the fourth switch is connected to the battery management system included in the power distribution unit;

[0017] And / or, the energy storage module further includes: a fifth switch, the other end of the supercapacitor being connected to the input terminal of the first inverter circuit via the fifth switch; the control terminal of the fifth switch being connected to the battery management system included in the power distribution unit.

[0018] Optionally, the power distribution unit further includes a second inverter circuit;

[0019] The other end of the supercapacitor is also connected to the input terminal of the second inverter circuit;

[0020] The output terminal of the second inverter circuit is connected to the wireless power transmission device.

[0021] Optionally, the power distribution unit further includes a second inverter circuit, a second rectifier circuit, and a first DC / AC converter;

[0022] The input terminal of the second rectifier circuit is connected to the external power grid, the output terminal of the second rectifier circuit is connected to the input terminal of the second inverter circuit, and the output terminal of the second inverter circuit is connected to the wireless power transmission device.

[0023] The input terminal of the second rectifier circuit is also connected to the rechargeable battery through the first DC / AC converter;

[0024] In response to the grid capacity being greater than a capacity threshold, the second rectifier circuit rectifies the AC voltage provided by the grid and outputs a DC voltage to the second inverter circuit.

[0025] In response to the grid capacity being less than or equal to a capacity threshold, the first DC / AC converter converts the DC voltage output by the rechargeable battery into an AC voltage and outputs it to the second rectifier circuit.

[0026] Optionally, the X-ray imaging device further includes a third rectifier circuit, a third inverter circuit, and a rotating-side load; the wireless power transmission device includes a stationary-side winding and a rotating-side winding; the input terminal of the third rectifier circuit is connected to the rotating-side winding, the output terminal of the third rectifier circuit is connected to the input terminal of the third inverter circuit, and the output terminal of the third inverter circuit is connected to the rotating-side load.

[0027] The power distribution unit also includes a second DC / AC converter;

[0028] The input terminal of the second DC / AC converter is connected to the output terminal of the energy storage module and / or the first rectifier circuit, and the output terminal of the DC / AC converter is connected to the stationary winding.

[0029] Optionally, if the energy storage module includes a rechargeable battery, the power distribution unit further includes a third DC / AC converter; the rechargeable battery is connected to the input terminal of the first rectifier circuit through the third DC / AC converter.

[0030] Secondly, a wireless power transmission device is provided, comprising:

[0031] A first ring structure, wherein a first frame is fixedly provided on one side of the first ring structure along the axial direction, and a first winding is wound on the first frame;

[0032] The second ring structure has a second frame fixed on one side along the axial direction, and the first frame and the second frame are arranged facing each other. A second winding is wound on the second frame.

[0033] There is a gap between the first winding and the second winding, and the second annular structure is rotatable relative to the first annular structure.

[0034] Optionally, the wireless power transmission device includes at least two first windings, and a portion of the at least two first windings are main windings, while the remaining first windings are auxiliary windings; the wireless power transmission device includes at least two second windings, and a portion of the at least two second windings are main windings, while the remaining second windings are auxiliary windings.

[0035] And / or, one side of the first annular structure along the axial direction also has an inherent magnetic core assembly, the magnetic core assembly including at least one magnetic core, the first winding passing through a window of the magnetic core, and the second frame passing through the air gap of the magnetic core and fixed to the second annular structure;

[0036] And / or, the first annular structure has the same dimensions as the second annular structure.

[0037] Thirdly, an X-ray imaging device is provided, comprising a power distribution unit as described in any one of the first aspects or a wireless power transmission device as described in any one of the second aspects.

[0038] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this disclosure.

[0039] The positive and progressive effects of this disclosure are as follows: In this disclosure, the power supply from the grid and the power supply from the energy storage module are in parallel, which can reduce the demand of X-ray imaging equipment on the grid capacity. Since the charging circuit only participates in the charging process of the energy storage module and not in the discharging process, it can realize the "simultaneous charging and discharging" of the energy storage module. Moreover, there are no excessive requirements on the power level of the charging circuit; a charging circuit in the order of a few kW is sufficient, which can reduce the cost of the charging circuit and thus reduce the overall cost of the power distribution unit. Attached Figure Description

[0040] Figure 1 A schematic diagram of the structure of an X-ray imaging device provided by the prior art;

[0041] Figure 2 A schematic diagram of the configuration structure of a power distribution unit provided for an exemplary embodiment of this disclosure;

[0042] Figure 3 A schematic diagram illustrating an application scenario of a power distribution unit provided as an exemplary embodiment of this disclosure;

[0043] Figure 4 A schematic diagram illustrating an application scenario of another power distribution unit provided as an exemplary embodiment of this disclosure;

[0044] Figure 5 A schematic diagram illustrating an application scenario of another power distribution unit provided as an exemplary embodiment of this disclosure;

[0045] Figure 6 A cross-sectional view of a wireless power transmission device for an X-ray imaging apparatus provided as an exemplary embodiment of this disclosure;

[0046] Figure 7 A cross-sectional view of a wireless power transmission device for another X-ray imaging apparatus provided in an exemplary embodiment of this disclosure. Detailed Implementation

[0047] The present disclosure is further illustrated below by way of embodiments, but the present disclosure is not limited to the scope of the embodiments described herein.

[0048] The prefixes such as "first" and "second" used in this disclosure are merely for distinguishing different descriptive objects and do not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes used to distinguish descriptive objects in this disclosure does not constitute a limitation on the described objects. The description of the described objects is given in the claims or the context of the embodiments, and should not be construed as an unnecessary limitation. Furthermore, in the description of this embodiment, unless otherwise stated, "multiple" means two or more.

[0049] Figure 1 This diagram illustrates the structure of an X-ray imaging device, which mainly includes a power distribution unit 11, a wireless power transmission device 12, a high-voltage generator (HVG) 13, an X-ray tube 14, a detector, and a frame (not shown). The power distribution unit 11 is located on the stationary side of the frame, while the HVG 13, X-ray tube 14, and detector are located on the rotating side. The electrical energy output from the power distribution unit 11 powers the HVG 13 and detector via the wireless power transmission device 12. The HVG 13 converts low-voltage electricity into high-voltage direct current (up to 140kV) and applies it between the anode and cathode of the X-ray tube 14, generating a high-voltage electric field between them. Simultaneously, the HVG 13 provides filament current to the cathode of the X-ray tube 14, causing the filament to heat up and generate free electrons at the cathode. Under the influence of the high-voltage electric field, these electrons bombard the anode target disk at high speed, producing X-rays. In addition, the HVG13 provides an anode drive power supply to power the anode motor of the X-ray tube 14, enabling the anode target disk to rotate at high speed and facilitating heat dissipation. The detector converts the X-rays generated by the X-ray tube 14 into image signals, achieving scanning imaging.

[0050] For CTs employing wireless power transmission devices, the power distribution unit 11 includes a rectifier circuit, an inverter circuit, a bidirectional DC-DC converter, and an energy storage unit. The energy storage unit is connected to the output of the rectifier circuit and the input of the inverter via the bidirectional DC-DC converter. The charging and discharging processes of the energy storage unit both pass through the bidirectional DC-DC converter, resulting in two problems: firstly, simultaneous charging and discharging is impossible; secondly, when the energy storage unit discharges to the power components included in the power distribution unit, the power of the bidirectional DC / DC converter must not be less than the sum of the power of each power component. Taking a power component comprising a first inverter circuit and a second inverter circuit as an example, the power of the bidirectional DC / DC converter should not be less than the sum of the power of the first inverter circuit (on the order of hundreds of kW) and the second inverter circuit (on the order of tens of kW). This high power requirement for the bidirectional DC / DC converter significantly increases its design difficulty and cost.

[0051] Based on the above-mentioned deficiencies, this disclosure provides a low-cost power distribution unit that enables the energy storage module to "charge and discharge simultaneously".

[0052] Figure 2 This is a schematic diagram of the configuration structure of a power distribution unit 21 provided for an exemplary embodiment of the present disclosure. The power distribution unit 21 includes: a first rectifier circuit 211, a charging circuit 212, an energy storage module 213, and a first inverter circuit 214.

[0053] The input terminals of both the first rectifier circuit 211 and the charging circuit 212 are connected to the external power grid. The output terminal of the first rectifier circuit 211 is connected to the input terminal of the first inverter circuit 214, and the output terminal of the first inverter circuit 214 is connected to the wireless power transmission device. The output terminal of the charging circuit 212 is connected to one end of the energy storage module 213, and the other end of the energy storage module 213 is connected to the input terminal of the first inverter circuit 214. Specifically, the wireless power transmission device includes a stationary winding and a rotating winding, and the output terminal of the first inverter circuit 214 is connected to the stationary winding.

[0054] In this embodiment, the grid power supply and the energy storage module power supply are in parallel, which can reduce the grid capacity requirements of the X-ray imaging equipment. Since the charging circuit only participates in the charging process of the energy storage module and not in the discharging process, the energy storage module can be "charged and discharged simultaneously". Moreover, there are no strict requirements on the power level of the charging circuit; a charging circuit in the order of a few kW is sufficient, which can reduce the cost of the charging circuit and thus reduce the overall cost of the power distribution unit.

[0055] In one embodiment, in response to the grid capacity being greater than a capacity threshold, the first rectifier circuit 211 rectifies the AC voltage provided by the grid and outputs a DC voltage to the first inverter circuit 214. The first inverter circuit 214 converts the DC voltage into an AC voltage and outputs it to the wireless power transmission device to power the wireless power transmission device, and then to power other loads of the X-ray imaging equipment (e.g., HVG, detector, etc.).

[0056] In one embodiment, in response to the grid capacity exceeding a capacity threshold, the charging circuit 212 charges the energy storage module 213 using the AC voltage provided by the grid. Furthermore, the energy storage module 213 can supply power to the first inverter circuit 214, thus enabling both the grid and the energy storage module 213 to simultaneously power the wireless power transmission device via the first inverter circuit 214, ensuring power supply stability.

[0057] When the grid capacity is less than or equal to the capacity threshold, the energy storage module 213 outputs a DC voltage to the first inverter circuit 214, which then supplies power to the wireless power transmission device. At this time, the energy storage module 213 can supply power to the wireless power transmission device independently or primarily supply power to it. When the energy storage module 213 outputs a DC voltage to the first inverter circuit 214, it does not need to pass through the charging circuit 212; that is, the charging circuit 212 does not participate in the discharge process of the energy storage module 213, thus enabling the energy storage module 213 to "charge and discharge simultaneously."

[0058] The capacity threshold can be set according to actual needs. If the grid capacity is greater than the capacity threshold, it means that the grid capacity is sufficient to power the X-ray imaging equipment. If the grid capacity is less than or equal to the capacity threshold, it means that the grid capacity is insufficient to power the X-ray imaging equipment, and it is necessary to combine it with an energy storage module to power the X-ray imaging equipment; or switch to off-grid mode, where the energy storage module powers the X-ray imaging equipment alone. In this way, even if there is a sudden power failure at the installation site of the X-ray imaging equipment, the energy storage module can still ensure the safe and stable operation of the X-ray imaging equipment.

[0059] In one embodiment, the first rectifier circuit 211 and the energy storage module 213 are controlled differently according to different scanning protocols and the capacity status of the power grid to provide the wireless transmission device with an AC voltage corresponding to the scanning protocol. Then, through the transmission of the stationary side winding and the rotating side winding in the wireless transmission device, as well as the voltage conversion of the rotating side step-up transformer and the rotating side rectifier and filter module, a voltage corresponding to the scanning protocol can be generated at the anode and cathode of the X-ray tube, thereby enabling scanning imaging of the corresponding parts of the patient.

[0060] In one embodiment, the charging circuit 212 employs an AFE (Analog Front End) charger. The input of the AFE charger is connected to the neutral (N) line of the power grid and any one of the phase lines A, B, or C. The AFE charger enables efficient and reliable charging of the energy storage module 213.

[0061] In one embodiment, see Figure 3 The energy storage module 213 includes: a rechargeable battery 311, a bidirectional DC / DC converter 312, and a supercapacitor 313. The rechargeable battery 311 may, but is not limited to, be a lithium battery.

[0062] The input terminal of the rechargeable battery 311 is connected to the output terminal of the charging circuit 212; the output terminal of the rechargeable battery 311 is connected to one end of the supercapacitor 313 through the bidirectional DC / DC converter 312, and the other end of the supercapacitor 313 is connected to the input terminal of the first inverter circuit 214.

[0063] The charging circuit 212 first charges the rechargeable battery 311, which then charges the supercapacitor 313 via the bidirectional DC / DC converter 312. The supercapacitor 313 then supplies power to the first inverter circuit 214.

[0064] The bidirectional DC / DC converter 312 is a device that enables electrical energy conversion, allowing DC voltage to flow bidirectionally, either from the input to the output or vice versa. Therefore, the rechargeable battery 311 can also recover energy lost due to braking of the rotating-side motor or heat loss in the X-ray tube through the bidirectional DC / DC converter 312, improving energy utilization efficiency and meeting the requirements of energy conservation and emission reduction.

[0065] In one embodiment, see Figure 3 The power distribution unit also includes: a first switch K1, the input terminal of the charging circuit 212 is connected to the external power grid through the first switch K1; the control terminal of the first switch K1 is connected to the battery management system included in the power distribution unit 21.

[0066] The battery management system controls the opening and closing of the first switch K1 to switch the connection state between the charging circuit 212 and the power grid. For example, in response to the remaining capacity of the rechargeable battery 311 being less than a first remaining capacity threshold (i.e., insufficient remaining capacity), the battery management system controls the first switch K1 to close. At this time, the charging circuit 212 is connected to the power grid, and can use the power from the grid to charge the rechargeable battery 311. In response to the remaining capacity of the rechargeable battery 311 being greater than or equal to the first remaining capacity threshold (i.e., sufficient remaining capacity), the battery management system controls the first switch K1 to open. At this time, the charging circuit 212 is disconnected from the power grid, and stops charging the rechargeable battery 311. The first remaining capacity threshold is set according to actual needs.

[0067] In one embodiment, the energy storage module 213 further includes: a second switch K2, one end of the rechargeable battery 311 is connected to the output terminal of the charging circuit 212 through the second switch K2; the control terminal of the second switch K2 is connected to the battery management system included in the power distribution unit 21.

[0068] The battery management system switches the connection state between the charging circuit 212 and the rechargeable battery 311 by controlling the opening and closing of the second switch K2. For example, in response to the remaining capacity of the rechargeable battery 311 being less than a first remaining capacity threshold (i.e., insufficient remaining capacity), the battery management system controls the second switch K2 to close, at which point the charging circuit 212 is connected to the rechargeable battery 311, and the charging circuit 212 can charge the rechargeable battery 311. In response to the remaining capacity of the rechargeable battery 311 being greater than or equal to the first remaining capacity threshold (i.e., sufficient remaining capacity), the battery management system controls the second switch K2 to open, at which point the charging circuit 212 is disconnected from the rechargeable battery 311, and the charging circuit 212 stops charging the rechargeable battery 311.

[0069] In one embodiment, the energy storage module 213 further includes a third switch K3, the other end of the rechargeable battery 311 being connected to the bidirectional DC / DC converter 312 via the third switch K3; the control terminal of the third switch K3 is connected to the battery management system included in the power distribution unit 21.

[0070] The battery management system controls the opening and closing of the third switch K3 to switch the connection state between the bidirectional DC / DC converter 312 and the rechargeable battery 311. For example, in response to the remaining capacity of the supercapacitor 313 being less than a second remaining capacity threshold, the battery management system controls the third switch K3 to close. At this time, the bidirectional DC / DC converter 312 is connected to the rechargeable battery 311, and the DC / DC converter can use the electrical energy of the rechargeable battery 311 to charge the supercapacitor 313. In response to the remaining capacity of the supercapacitor 313 being greater than or equal to the second remaining capacity threshold, the battery management system controls the third switch K3 to open. At this time, the bidirectional DC / DC converter 312 is disconnected from the rechargeable battery 311, and the DC / DC converter stops charging the rechargeable battery 311.

[0071] In one embodiment, the energy storage module 213 further includes: a fourth switch K4, through which the bidirectional DC / DC converter 312 is connected to one end of the supercapacitor 313; the control terminal of the fourth switch K4 is connected to the battery management system included in the power distribution unit 21.

[0072] The battery management system controls the opening and closing of the fourth switch K4 to switch the connection state between the bidirectional DC / DC converter 312 and the supercapacitor 313. For example, in response to the remaining capacity of the supercapacitor 313 being less than a second remaining capacity threshold, the battery management system controls the fourth switch K4 to close. At this time, the bidirectional DC / DC converter 312 is connected to the supercapacitor 313, and the DC / DC converter can charge the supercapacitor 313. In response to the remaining capacity of the supercapacitor 313 being greater than or equal to the second remaining capacity threshold, the battery management system controls the fourth switch K4 to open. At this time, the bidirectional DC / DC converter 312 is disconnected from the supercapacitor 313, and the DC / DC converter stops charging the rechargeable battery 311. The second remaining capacity threshold can be set according to actual needs.

[0073] In one embodiment, the energy storage module 213 further includes: a fifth switch K5, the other end of the supercapacitor 313 being connected to the input terminal of the first inverter circuit 214 via the fifth switch K5; and the control terminal of the fifth switch K5 being connected to the battery management system included in the power distribution unit 21.

[0074] The battery management system controls the opening and closing of the fifth switch K5 to switch the connection state between the first inverter circuit 214 and the supercapacitor 313. For example, in response to the grid capacity being less than or equal to the capacity threshold, the battery management system controls the fifth switch K5 to close, at which point the first inverter circuit 214 is connected to the supercapacitor 313, and the supercapacitor 313 can supply power to the first inverter circuit 214. In response to the grid capacity being greater than the capacity threshold, the battery management system controls the fifth switch K5 to open, at which point the first inverter circuit 214 is disconnected from the supercapacitor 313, and the supercapacitor 313 stops supplying power to the first inverter circuit 214.

[0075] In one embodiment, the power distribution unit further includes a sixth switch K6 and a seventh switch K7. The input terminal of the first rectifier circuit 211 is connected to the external power grid through the sixth switch K6, and the output terminal of the first rectifier circuit 211 is connected to the input terminal of the first inverter circuit through the seventh switch K7. The control terminals of the first switch K6 and the seventh switch K7 are both connected to the battery management system. In response to the grid capacity being greater than the capacity threshold, the battery management system controls the sixth switch K6 and the seventh switch K7 to close. The first rectifier circuit 211 rectifies the AC voltage provided by the grid and outputs a DC voltage to the first inverter circuit 214, so that the first inverter circuit 214 converts the DC voltage into AC voltage and outputs it to the wireless power transmission device to power the wireless power transmission device.

[0076] In one embodiment, see Figure 3 The power distribution unit 21 also includes a second inverter circuit 215 and a second rectifier circuit 216; the input terminal of the second rectifier circuit 216 is connected to the external power grid, the output terminal of the second rectifier circuit 216 is connected to the input terminal of the second inverter circuit 215, and the output terminal of the second inverter circuit 215 is connected to the wireless power transmission device.

[0077] In one embodiment, the input terminal of the second rectifier circuit 216 is connected to the external power grid via an eighth switch K8, and the control terminal of the eighth switch K8 is connected to the battery management system. When auxiliary inverter circuit operation is required, the battery management system controls the eighth switch K8 to close, thereby connecting the second rectifier circuit 216 to the power grid.

[0078] In this embodiment, one of the two inverter circuits serves as the main inverter circuit, and the other as the auxiliary inverter circuit. The auxiliary inverter circuit can supply power to loads other than the main loads such as the HVG (e.g., the anode drive of the X-ray tube 14). The main inverter circuit will only start supplying power to the main loads such as the HVG after the auxiliary inverter circuit has provided power to the other loads. The power of the auxiliary inverter circuit is much lower than that of the main inverter circuit.

[0079] In one embodiment, see Figure 7The wireless power transmission device includes two sets of stationary side windings. One set of stationary side windings includes multiple first stationary side windings, and the other set includes multiple second stationary side windings. The windings in the two sets of stationary side windings can be arranged randomly or in a regular pattern; specific arrangements are described in the following embodiments. Two inverter circuits are connected to the first and second stationary side windings, respectively, to supply power to them. One set of stationary side windings can serve as the main winding, and the other as an auxiliary winding. Corresponding to the stationary side windings, the wireless power transmission device includes two sets of rotating side windings. One set of rotating side windings includes multiple first rotating side windings, and the other set includes multiple second rotating side windings. One set of rotating side windings serves as the main winding, and the other as an auxiliary winding.

[0080] In practical applications, the first inverter circuit 214 and the second inverter circuit 215 can be controlled differently according to different scanning protocols to convert DC voltage into AC voltage corresponding to the scanning protocol. Then, through the transmission of the stationary side winding and the rotating side winding in the wireless transmission device, as well as the voltage conversion of the rotating side step-up transformer and the rotating side rectifier and filter module, the voltage corresponding to the scanning protocol can be generated at the anode and cathode of the X-ray tube, thereby enabling scanning imaging of the corresponding parts of the patient.

[0081] It should be noted that the number of sets of stationary windings is not limited to two, and the number of inverter circuits is not limited to... Figure 3 As shown in the two examples, the number of inverter circuits should match the number of sets of stationary side windings.

[0082] In one embodiment, see Figure 3 The power distribution unit 21 also includes a first DC / AC converter 217, and the input terminal of the second rectifier circuit 216 is connected to the rechargeable battery 311 through the first DC / AC converter 217. In response to the grid capacity being greater than a capacity threshold, the second rectifier circuit 216 rectifies the AC voltage provided by the grid and outputs a DC voltage to the second inverter circuit 215. In response to the grid capacity being less than or equal to the capacity threshold, the first DC / AC converter 217 converts the DC voltage output by the rechargeable battery 311 into an AC voltage and outputs it to the second inverter circuit 215. In this embodiment, both inverter circuits are located on the quiescent side, and the second inverter circuit 215 is powered by the grid and / or the rechargeable battery 311.

[0083] In one embodiment, the power distribution unit 21 further includes a ninth switch K9 and a tenth switch K10. The first DC / AC converter 217 is connected to the rechargeable battery and the second rectifier circuit 216 through the ninth switch K9 and the tenth switch K10, respectively. The control terminals of the ninth switch K9 and the tenth switch K10 are both connected to the battery management system. In response to the grid capacity being less than or equal to the capacity threshold, the battery management system controls the ninth switch K9 and the tenth switch K10 to close. The first DC / AC converter 217 converts the DC voltage output by the rechargeable battery 311 into an AC voltage and outputs it to the second inverter circuit 215.

[0084] In this embodiment, similar to the first inverter circuit, both the power grid and the energy storage module can supply power to the second inverter circuit. In specific applications, the second rectifier circuit and the first DC / AC converter can be controlled differently according to different scanning protocols and the capacity status of the power grid to provide the required power to the second inverter circuit.

[0085] In one embodiment, priority can be given to grid power supply. When the grid capacity is insufficient, the energy storage module can be used in conjunction with the energy storage module or the energy storage module can supply power alone. This can reduce the number of times the energy storage module is used and extend the life of the supercapacitor 313.

[0086] In one embodiment, when the power distribution unit 21 includes a second inverter circuit 215, the other end of the supercapacitor 313 is also connected to the input terminal of the second inverter circuit 215; the output terminal of the second inverter circuit 215 is connected to the stationary side winding. In this embodiment, both inverter circuits are located on the stationary side, and the second inverter circuit 215 is powered by the supercapacitor 313.

[0087] In one embodiment, see Figure 4 The X-ray imaging equipment also includes a third rectifier circuit 411, a third inverter circuit 412, and a rotating-side load. The input terminal of the third rectifier circuit 411 is connected to the rotating-side winding, the output terminal of the third rectifier circuit 411 is connected to the input terminal of the third inverter circuit 412, and the output terminal of the third inverter circuit 412 is connected to the rotating-side load. The power distribution unit 21 also includes a second DC / AC converter 218. The rotating-side load may include, but is not limited to, an HVG (Hydraulic Voltage Regulator), a detector, etc.

[0088] The input terminal of the second DC / AC converter 218 is connected to the output terminal of the energy storage module 213 and / or the first rectifier circuit 211, and the output terminal of the DC / AC converter is connected to the stationary winding. When the power grid supplies power to the wireless power transmission device alone, the second DC / AC converter 218 is used to convert the DC voltage output by the first rectifier circuit 211 into an AC voltage and output it to the stationary winding. The stationary winding then transmits the AC voltage to the rotating winding, and the rotating winding outputs it to the rotating load through the third rectifier circuit 411 and the third inverter circuit 412. When the power grid supplies power to the wireless power transmission device in conjunction with the energy storage module, the second DC / AC converter 218 is used to convert the DC voltage output by the first rectifier circuit 211 and / or the energy storage module into an AC voltage and output it to the stationary winding. The stationary winding then transmits the AC voltage to the rotating winding, and the rotating winding outputs it to the rotating load through the third rectifier circuit 411 and the third inverter circuit 412. When the energy storage module supplies power to the wireless power transmission device alone, the second DC / AC converter 218 converts the DC voltage output by the energy storage module into AC voltage and outputs it to the stationary side winding. In this embodiment, the entire high voltage system is configured on the rotating side.

[0089] When powered solely by the mains grid, the three-phase grid supplies power to the second DC / AC circuit via the first rectifier circuit 211, which in turn supplies power to the stationary winding. Simultaneously, the first rectifier circuit 211 supplies power to the first inverter circuit 214, which in turn supplies power to the stationary winding. In one implementation, when the rotating winding includes a main winding and an auxiliary winding, the second DC / AC circuit and the first inverter circuit 214 supply power to the main winding and the auxiliary winding, respectively. The stationary winding transmits AC voltage to the rotating winding, which then supplies voltage to the HVG via the third rectifier circuit 411 and the third inverter circuit 412.

[0090] When the energy storage module 213 is used for power supply alone, the supercapacitor 313 supplies power to the stationary winding through the second DC / AC circuit, and simultaneously supplies power to the stationary winding through the first inverter circuit 214. In one implementation, when the rotating winding includes a main winding and an auxiliary winding, the second DC / AC circuit and the first inverter circuit 214 supply power to the main winding and the auxiliary winding, respectively. The stationary winding transmits AC voltage to the rotating winding, and the rotating winding provides voltage to the HVG through the third rectifier circuit 411 and the third inverter circuit 412.

[0091] In one embodiment, see Figure 5 The power distribution unit 21 also includes a third DC / AC converter 219; the rechargeable battery 311 is connected to the input terminal of the first rectifier circuit 211 through the third DC / AC converter 219. This embodiment is... Figure 4A further improvement to the power distribution unit 21 shown is that, in off-grid mode, when the grid stops supplying power to the X-ray imaging equipment, the rechargeable battery 311 supplies power to the first inverter circuit 214 via the third DC / AC converter 219 and the first rectifier circuit 211. The first inverter circuit 214 then supplies power to the stationary winding. The rechargeable battery 311 can also supply power to the second DC / AC converter 218 via the third DC / AC converter 219 and the first rectifier circuit 211.

[0092] In one implementation, when the rotating side winding includes a main winding and an auxiliary winding, the second DC / AC circuit and the first inverter circuit 214 supply power to the main winding and the auxiliary winding, respectively. The stationary side winding transmits AC voltage to the rotating side winding, and the rotating side winding provides voltage to the HVG through the third rectifier circuit 411 and the third inverter circuit 412.

[0093] Figure 6 This embodiment of the present disclosure provides a schematic diagram of a wireless power transmission device, which includes a first annular structure 60 and a second annular structure 63. A first frame 61 is fixed to one axial side of the first annular structure 60, and a first winding 62 is wound around the first frame 61. A second frame 64 is fixed to one axial side of the second annular structure 63, with the first frame 61 and the second frame 64 facing each other, and a second winding 65 is wound around the second frame 64. A gap exists between the first winding 62 and the second winding 65, and the second annular structure 63 is rotatable relative to the first annular structure 60.

[0094] In this design, the axial direction of the ring structure is parallel to or coincides with the rotation axis of the wireless power transmission device. The axial side surface T of the ring structure is also the plane that intersects with the circumferential surface S (including the inner and outer circumferential surfaces) of the ring structure, or the extreme surface of the circumferential surface S. The circumferential surface S is also the closed curved surface of the ring structure.

[0095] In one embodiment, a magnetic core assembly is mounted on the axial side T of a first annular structure 60. The magnetic core assembly includes at least one magnetic core 66, and a first winding 62 passes through a window 661 of the magnetic core 66 in the magnetic core assembly. A second frame 64 is fixed on the axial side T of a second annular structure 63, and a second winding 65 is wound on the second frame 64, passing through the window 661 of the magnetic core 66 in the magnetic core assembly. A gap is provided between the first winding and the second winding on the same magnetic core.

[0096] It should be noted that the number of first and second windings included in the wireless power transmission device is not limited to... Figure 6Two windings are shown, and the number of first and second windings can be set according to actual conditions. When there are multiple first and second windings, the multiple first windings can be distributed along the axial side of the first annular structure. The multiple first windings can be deployed in one loop, two loops, or even more. Correspondingly, the multiple second windings are distributed along the axial side of the second annular structure. The multiple second windings can be deployed in one loop, two loops, or even more. This disclosure does not particularly limit the deployment method of the first and second windings.

[0097] In a specific implementation, multiple first frames 61 can be fixed on the first annular structure 60, and a first winding 62 can be wound on each first frame 61. Alternatively, a single annular first frame 61 can be fixed on the first annular structure 60, and a first winding 62 can be wound on the first frame 61, wherein the first winding 62 is an annular winding around the first annular structure 60.

[0098] Similarly, multiple second frames 64 can be fixed on the second annular structure 63, and a second winding 65 can be wound on each second frame 64. Alternatively, a single annular second frame 64 can be fixed on the second annular structure 63, and a second winding 65 can be wound on the second frame 64, wherein the second winding 65 is an annular winding around the second annular structure 63.

[0099] The magnetic core 66 in the magnetic core 66 assembly can be non-uniformly installed around the first annular structure 60. Preferably, the magnetic core 66 in the magnetic core 66 assembly is uniformly installed around the circumference of the first annular structure 60. In this embodiment, since the magnetic core 66 in the magnetic core 66 assembly is uniformly installed around the first annular structure 60, the first frame 61, the first winding 62, and the second frame 64 corresponding to the same magnetic core 66 in the magnetic core 66 assembly are also uniformly installed accordingly. This allows the wireless power transmission device to be subjected to uniform force, thereby improving the stability of the wireless power transmission device during operation.

[0100] In this embodiment, a certain gap is maintained between the first winding 62 and the second winding 65 to ensure that the first winding 62 and the second winding 65 will not come into contact with each other when they rotate relative to each other. The first winding 62 and the second winding 65 are magnetically coupled through the magnetic core 66 assembly to transfer the electrical energy received by the first winding 62 to the second winding 65.

[0101] In one embodiment, when there are multiple first windings and multiple second windings, they can be divided into main windings and auxiliary windings. Specifically, a portion of the multiple first windings are designated as main windings, and the remaining first windings are designated as auxiliary windings; a portion of the multiple second windings are designated as main windings, and the remaining second windings are designated as auxiliary windings.

[0102] For example, see Figure 7 In the diagram, the first winding 62a and the second winding 65a are the main windings, and the first winding 62b and the second winding 65b are the auxiliary windings. In other implementations, the first winding 62a and the second winding 65a can also be used as auxiliary windings, and the first winding 62b and the second winding 65b can be used as main windings.

[0103] The deployment of the main winding and auxiliary winding can be regular, in order to... Figure 7 For example, the main windings are distributed circumferentially in a first circle on one side of the annular structure along the axial direction, and the auxiliary windings are distributed circumferentially in a second circle on the same side of the annular structure along the axial direction. The diameter of the first circle is larger than the diameter of the second circle. The regularly distributed windings facilitate subsequent wiring with the power distribution unit. In other implementations, the windings can also be distributed irregularly, which is not particularly limited in this embodiment.

[0104] In one embodiment, the second winding is connected to the inverter circuit of the power distribution unit, whereby the second winding serves as the stationary winding and the first winding serves as the rotating winding.

[0105] In one embodiment, the first winding is connected to the inverter circuit of the power distribution unit. In this case, the first winding serves as the stationary winding, and the second winding serves as the rotating winding. In this embodiment, the magnetic core is fixed to the first annular structure on the stationary side, rather than to the second annular structure on the rotating side. The magnetic core does not rotate with the second annular structure on the rotating side, thereby reducing the weight of the second annular structure and increasing its rotational speed. Furthermore, since the magnetic core is fixed, magnetic field stability can be ensured, thus improving the determinism of the wireless power transmission device.

[0106] In one embodiment, the wireless power transmission device further includes a rack. A first annular structure 60 is fixedly connected to the rack, and a second annular structure 63 is rotatable relative to the first annular structure 60. In a specific embodiment, the first annular structure 60 is located on the stationary side of the rack, and the second annular structure 63 is located on the rotating side of the rack. During the operation of the wireless power transmission device, the second annular structure 63 rotates with the rack, and the first annular structure 60 and the second annular structure 63 rotate relative to each other. The stationary-side winding is connected to a power distribution unit. During the relative rotation of the first annular structure 60 and the second annular structure 63, the stationary-side winding transmits the AC voltage provided by the power distribution unit to the rotating-side winding.

[0107] In addition, applying the wireless power transmission device provided in this embodiment to an X-ray imaging device can reduce the weight on the rotating side of the gantry, which is beneficial to increasing the rotation speed of the gantry and improving the temporal resolution of the X-ray imaging device.

[0108] In one embodiment, the magnetic core 66 in the magnetic core assembly has an air gap 662, and the second frame 64 passes through the air gap 662 and is fixed to the second annular structure 63. In this embodiment, the stationary winding and the rotating winding can be magnetically coupled through the magnetic core assembly and the air gap 662 of the magnetic core 66, thereby transferring electrical energy from the stationary winding to the rotating winding. The position of the air gap 662 in the magnetic core 66 determines the relative position between the second annular structure 63 and the first annular structure 60. Specifically, the structure of the magnetic core can be UU-shaped, UY-shaped, etc., and is not specifically limited.

[0109] This disclosure also provides an X-ray imaging device, which includes a wireless power transmission device and a power distribution unit provided in any of the above embodiments. The power distribution unit is connected to the wireless power transmission device and is used to supply power to the wireless power transmission device. For specific implementations of the wireless power transmission device and power supply methods of the power distribution unit, please refer to the descriptions in any of the above embodiments, and they will not be repeated here.

[0110] Among them, X-ray imaging equipment can be CT equipment, as well as CT combined with other modal imaging equipment, such as PET-CT equipment, which combines CT with PET (positron emission tomography).

[0111] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A power distribution unit, characterized by, The device is applied to an X-ray imaging apparatus, which further includes a wireless power transmission device; the power distribution unit includes: a first rectifier circuit, a charging circuit, an energy storage module, and a first inverter circuit; The input terminals of both the first rectifier circuit and the charging circuit are connected to the external power grid; the output terminal of the first rectifier circuit is connected to the input terminal of the first inverter circuit, and the output terminal of the first inverter circuit is connected to the wireless power transmission device; the output terminal of the charging circuit is connected to one end of the energy storage module, and the other end of the energy storage module is connected to the input terminal of the first inverter circuit. The first inverter circuit is used to convert the output voltage of the first rectifier circuit into an AC voltage and output it to the wireless power transmission device.

2. The power distribution unit of claim 1, wherein, In response to the grid capacity being greater than the capacity threshold, the first rectifier circuit rectifies the AC voltage provided by the grid and outputs a DC voltage to the first inverter circuit. And the charging circuit charges the energy storage module; In response to the grid capacity being less than or equal to a capacity threshold, the energy storage module outputs a DC voltage to the first inverter circuit.

3. The power distribution unit of claim 1, wherein, The energy storage module includes: a rechargeable battery, a bidirectional DC / DC converter, and a supercapacitor; The input terminal of the rechargeable battery is connected to the output terminal of the charging circuit; the output terminal of the rechargeable battery is connected to one end of the supercapacitor through the bidirectional DC / DC converter, and the other end of the supercapacitor is connected to the input terminal of the first inverter circuit.

4. The power distribution unit of claim 3, wherein, The power distribution unit further includes: a first switch, the input terminal of the charging circuit being connected to the external power grid through the first switch; the control terminal of the first switch being connected to the battery management system included in the power distribution unit; And / or, the energy storage module further includes: a second switch, one end of the rechargeable battery being connected to the output terminal of the charging circuit via the second switch; the control terminal of the second switch being connected to the battery management system included in the power distribution unit; And / or, the energy storage module further includes: a third switch, the other end of the rechargeable battery being connected to the bidirectional DC / DC converter via the third switch; the control terminal of the third switch being connected to the battery management system included in the power distribution unit; And / or, the energy storage module further includes: a fourth switch, wherein the bidirectional DC / DC converter is connected to one end of the supercapacitor via the fourth switch; the control terminal of the fourth switch is connected to the battery management system included in the power distribution unit; And / or, the energy storage module further includes: a fifth switch, the other end of the supercapacitor being connected to the input terminal of the first inverter circuit via the fifth switch; the control terminal of the fifth switch being connected to the battery management system included in the power distribution unit.

5. The power distribution unit of claim 3, wherein, The power distribution unit also includes a second inverter circuit; The other end of the supercapacitor is also connected to the input terminal of the second inverter circuit; The output terminal of the second inverter circuit is connected to the wireless power transmission device.

6. The power distribution unit of claim 3, wherein, The power distribution unit further includes a second inverter circuit, a second rectifier circuit, and a first DC / AC converter; The input terminal of the second rectifier circuit is connected to the external power grid, the output terminal of the second rectifier circuit is connected to the input terminal of the second inverter circuit, and the output terminal of the second inverter circuit is connected to the wireless power transmission device. The input terminal of the second rectifier circuit is also connected to the rechargeable battery through the first DC / AC converter; In response to the grid capacity being greater than a capacity threshold, the second rectifier circuit rectifies the AC voltage provided by the grid and outputs a DC voltage to the second inverter circuit. In response to the grid capacity being less than or equal to a capacity threshold, the first DC / AC converter converts the DC voltage output by the rechargeable battery into an AC voltage and outputs it to the second rectifier circuit.

7. The power distribution unit according to any one of claims 1-6, characterized in that, The X-ray imaging equipment further includes a third rectifier circuit, a third inverter circuit, and a rotating-side load; the wireless power transmission device includes a stationary-side winding and a rotating-side winding; the input terminal of the third rectifier circuit is connected to the rotating-side winding, the output terminal of the third rectifier circuit is connected to the input terminal of the third inverter circuit, and the output terminal of the third inverter circuit is connected to the rotating-side load. The power distribution unit also includes a second DC / AC converter; The input terminal of the second DC / AC converter is connected to the output terminal of the energy storage module and / or the first rectifier circuit, and the output terminal of the DC / AC converter is connected to the stationary winding.

8. The power distribution unit according to claim 7, characterized in that, In the case where the energy storage module includes a rechargeable battery, the power distribution unit further includes a third DC / AC converter; the rechargeable battery is connected to the input terminal of the first rectifier circuit through the third DC / AC converter.

9. A wireless power transmission device, characterized in that, include: A first ring structure, wherein a first frame is fixedly provided on one side of the first ring structure along the axial direction, and a first winding is wound on the first frame; The second ring structure has a second frame fixed on one side along the axial direction, and the first frame and the second frame are arranged facing each other. A second winding is wound on the second frame. There is a gap between the first winding and the second winding, and the second annular structure is rotatable relative to the first annular structure.

10. The wireless power transmission device according to claim 9, characterized in that, The wireless power transmission device includes at least two first windings, and a portion of the at least two first windings are main windings, while the remaining first windings in the at least two first windings are auxiliary windings. The wireless power transmission device includes at least two second windings, and a portion of the at least two second windings are main windings, while the remaining second windings are auxiliary windings. And / or, a magnetic core assembly is also mounted on one side of the first annular structure along the axial direction, the magnetic core assembly including at least one magnetic core, the first winding passing through a window of the magnetic core, and the second frame passing through the air gap of the magnetic core and fixed to the second annular structure; And / or, the first annular structure has the same dimensions as the second annular structure.

11. An X-ray imaging device, characterized in that, It includes the power distribution unit according to any one of claims 1-8 or the wireless power transmission device according to any one of claims 9-10.

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