High voltage transformer and medical device

Abstract

The application discloses a high-voltage transformer and a medical instrument. The high-voltage transformer comprises a magnetic core assembly, at least one primary winding and a plurality of secondary windings. The magnetic core assembly comprises at least one magnetic column. The primary winding corresponds to the plurality of secondary windings. The primary winding and the secondary windings are sleeved on the magnetic column. The secondary windings corresponding to the primary winding are arranged in a stacked manner. The secondary windings are arranged on a PCB. The PCB is provided with at least one secondary winding. The secondary winding comprises at least one coil. The secondary windings are arranged on the PCB. The secondary windings corresponding to the primary winding are arranged in a stacked manner. The electric field intensity can be reduced. The loss of the insulating medium between the PCBs can be reduced. The heat generation can be reduced. The high-voltage transformer can be operated at a high frequency for a long time.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a high-voltage transformer and a medical device. Background Technology

[0002] To meet the requirements of higher performance and smaller size for high-voltage generators in medical devices, the switching frequency of high-voltage generators needs to be further increased. In a high-voltage generator, the required DC high voltage is obtained through voltage boosting by a high-voltage transformer and rectification by a rectifier circuit. The equivalent circuit of the high-voltage transformer is as follows: Figure 1 As shown, to achieve the step-up function, a higher turns ratio is required between the primary and secondary windings of the high-voltage transformer. However, a higher number of turns in the secondary winding generates larger parasitic capacitance, which is detrimental to energy transfer to the final load. With the increase in switching frequency and the increase in circulating current caused by parasitic capacitance, the no-load loss of the high-voltage transformer increases. The inverter at the front end of the high-voltage generator needs to increase its power to achieve the same output, which also hinders the improvement of high-frequency dynamic performance.

[0003] Furthermore, the AC high voltage between different secondary windings is superimposed on the DC high voltage obtained from rectification. This AC high voltage can cause partial discharge at defects in the solid insulation components, leading to their breakdown. As the switching frequency increases, the number of partial discharges also increases proportionally, posing a greater challenge to insulation design. The AC high voltage also causes dielectric loss, which increases proportionally with the switching frequency. This dielectric loss leads to heating of the insulation, causing its degradation and ultimately resulting in high-voltage insulation breakdown, thus affecting the lifespan of the high-voltage transformer. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the various defects in existing high-voltage transformers caused by the increase of switching frequency, and to provide a high-voltage transformer and medical device suitable for high-frequency operation.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A first aspect of the present invention provides a high-voltage transformer, including a magnetic core assembly, at least one primary winding, and a plurality of secondary windings. The magnetic core assembly includes at least one magnetic post, and the primary winding corresponds to the plurality of secondary windings. The primary winding and the secondary winding are sleeved on the magnetic post. The secondary windings corresponding to the primary winding are stacked and disposed on a PCB board. Each secondary winding includes at least one coil.

[0007] Optionally, adjacent coils in two adjacent secondary windings are staggered.

[0008] Optionally, each of the secondary windings in at least a portion of the secondary windings includes at least two coils, which are respectively disposed on different layers of the PCB board, and the routing directions of two adjacent coils in the secondary windings are opposite.

[0009] Optionally, the routing directions of two adjacent coils in two adjacent secondary windings are the same.

[0010] Optionally, each of the secondary windings in at least a portion of the secondary windings includes at least two coils, wherein adjacent coils in the secondary windings are staggered.

[0011] Optionally, each secondary winding is connected to a corresponding rectifier circuit, and the rectifier circuit and the corresponding secondary winding are located on the same PCB board, with the rectifier circuits corresponding to two adjacent secondary windings connected in series.

[0012] Optionally, a capacitor is connected in parallel between the output terminals of the rectifier circuit.

[0013] Optionally, the rectifier circuit is a voltage doubler rectifier circuit.

[0014] Optionally, the connection terminals of the two series-connected rectifier circuits are connected to the ground terminal.

[0015] Optionally, the number of PCBs is at least two, and the rectifier circuits in two adjacent PCBs are connected in series through resistors.

[0016] Optionally, the number of turns in different secondary windings gradually decreases along the direction away from the ground terminal.

[0017] Optionally, the insulation distance between the secondary winding and the corresponding primary winding gradually increases in the direction away from the grounding terminal.

[0018] Optionally, the primary winding and the corresponding secondary winding are mounted on different magnetic posts, and the insulation distance between the secondary winding and the magnetic post gradually increases in the direction away from the grounding end.

[0019] Optionally, the magnetic core assembly is composed of at least two magnetic cores.

[0020] Optionally, the number of magnetic pillars is at least two, and the position and number of secondary windings on each magnetic pillar are the same. The secondary windings on the same position on different magnetic pillars are arranged on the same PCB board.

[0021] A second aspect of the present invention provides a medical device comprising the high-voltage transformer described in the first aspect.

[0022] Based on common knowledge in the field, the above optional conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0023] The positive and progressive effects of this invention are as follows: by setting the secondary winding on the PCB board and stacking the secondary winding corresponding to the primary winding, the electric field strength can be reduced, thereby reducing the loss of the insulating medium between the PCB boards, reducing heat generation, and enabling the high-voltage transformer to operate at high frequency for a long time. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the equivalent circuit of a high-voltage transformer in the prior art.

[0025] Figure 2 This is a schematic diagram of a connection between a high-voltage transformer and a rectifier circuit provided in Embodiment 1 of the present invention.

[0026] Figure 3 This is a schematic diagram of another connection between the high-voltage transformer and the rectifier circuit provided in Embodiment 1 of the present invention.

[0027] Figure 4 This is a schematic diagram of the internal layer structure of a PCB board provided in Embodiment 1 of the present invention.

[0028] Figure 5 This is a schematic diagram of a connection between the secondary winding and the rectifier circuit provided in Embodiment 1 of the present invention.

[0029] Figure 6 for Figure 5 A top view of the connection structure of medium and high voltage transformers and rectifier circuits.

[0030] Figure 7 This is a schematic diagram illustrating another connection between the secondary winding and the rectifier circuit provided in Embodiment 1 of the present invention.

[0031] Figure 8 This is another schematic diagram of the connection between the secondary winding and the rectifier circuit provided in Embodiment 1 of the present invention.

[0032] Figure 9 for Figure 8 A top view of the connection structure between the medium- and high-voltage transformer and the rectifier circuit.

[0033] Figure 10 This is another schematic diagram of the connection between the secondary winding and the rectifier circuit provided in Embodiment 1 of the present invention.

[0034] Figure 11 This is a cross-sectional schematic diagram of a high-voltage transformer provided in Embodiment 1 of the present invention.

[0035] Figure 12 This is a schematic diagram of a different PCB board connected in series with resistors, as provided in Embodiment 1 of the present invention.

[0036] Figure 13This is a cross-sectional schematic diagram of a high-voltage transformer comprising multiple PCB boards, provided in Embodiment 1 of the present invention.

[0037] Figure 14 for Figure 13 Top view.

[0038] Figure 15 This is a cross-sectional schematic diagram of a high-voltage transformer comprising multiple PCB boards, provided in Embodiment 1 of the present invention.

[0039] Figure 16 This is a cross-sectional schematic diagram of another high-voltage transformer including multiple PCB boards provided in Embodiment 1 of the present invention.

[0040] Figure 17 This is a cross-sectional schematic diagram of a high-voltage transformer provided in Embodiment 1 of the present invention.

[0041] Figure 18 This is a cross-sectional schematic diagram of another high-voltage transformer provided in Embodiment 1 of the present invention.

[0042] Figure 19 This is a cross-sectional schematic diagram of another high-voltage transformer provided in Embodiment 1 of the present invention.

[0043] Figure 20 This is a cross-sectional schematic diagram of another high-voltage transformer provided in Embodiment 1 of the present invention.

[0044] Figure 21 This is a cross-sectional schematic diagram of another high-voltage transformer provided in Embodiment 1 of the present invention.

[0045] Figure 22 This is a cross-sectional schematic diagram of another high-voltage transformer provided in Embodiment 1 of the present invention. Detailed Implementation

[0046] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0047] Example 1

[0048] This embodiment provides a high-voltage transformer, including a magnetic core assembly, at least one primary winding, and multiple secondary windings. The magnetic core assembly includes at least one magnetic post, and the primary winding corresponds to the multiple secondary windings. The primary winding and the secondary winding are sleeved on the magnetic post. The secondary windings corresponding to the primary winding are stacked and disposed on a PCB board. Each secondary winding includes at least one coil.

[0049] In specific implementations, the magnetic core assembly may include one magnetic core or may be composed of at least two magnetic cores. The primary winding may also be referred to as the primary winding or first-side winding, and the secondary winding may also be referred to as the secondary winding or second-side winding.

[0050] A PCB board can have one or more secondary windings. A secondary winding can include one coil or at least two coils. When a secondary winding includes at least two coils, the different coils can be located on different layers of the PCB board.

[0051] In this embodiment, by placing the secondary winding on the PCB board and stacking the secondary winding corresponding to the primary winding, the electric field strength can be reduced, thereby reducing the loss of the insulating medium between the PCB boards, reducing heat generation, and enabling the high-voltage transformer to operate at high frequency for a long time.

[0052] In one optional implementation, each secondary winding is connected to a corresponding rectifier circuit, and the rectifier circuit and the corresponding secondary winding are mounted on the same PCB board. The rectifier circuits corresponding to two adjacent secondary windings are connected in series. The rectifier circuit can be a full-bridge rectifier circuit, a half-bridge rectifier circuit, a voltage doubler rectifier circuit, etc.

[0053] In this embodiment, each secondary winding corresponds to a rectifier circuit. The voltage output by each secondary winding is an AC voltage, which is rectified by the corresponding rectifier circuit to obtain a DC voltage. By connecting the rectifier circuits corresponding to two adjacent secondary windings in series, multiple output DC voltages can be connected in series. The sum of these multiple DC voltages allows for the output of a higher DC voltage. In a specific example, a rectifier circuit corresponding to one secondary winding outputs a 5kV DC voltage; ten rectifier circuits corresponding to ten secondary windings connected in series can produce a 50kV DC voltage.

[0054] Each PCB board has at least one secondary winding and a corresponding rectifier circuit. With a single PCB board, different secondary windings can be stacked by placing them on different layers. With multiple PCB boards, different secondary windings can be stacked by stacking different PCB boards. In a practical implementation, different PCB board stacking can be achieved by setting vias around the perimeter of each PCB board and installing studs on the vias.

[0055] In one optional embodiment, a capacitor is connected in parallel between the output terminals of the rectifier circuit. The capacitor is used to filter the DC voltage rectified by the rectifier circuit. Specifically, since the capacitor stores energy, the voltage across it cannot change abruptly. Therefore, connecting the capacitor in parallel between the output terminals of the rectifier circuit makes the output voltage waveform smoother.

[0056] Figure 2 This diagram illustrates a circuit connection between a high-voltage transformer and a rectifier circuit. Figure 2 In the example shown, the high-voltage transformer includes one primary winding and n secondary windings. The output terminal of each secondary winding is connected to a rectifier circuit, and there are a total of n rectifier circuits. The rectifier circuits corresponding to two adjacent secondary windings are connected in series. After the n rectifier circuits are connected in series, two output terminals HV+ and HV- are formed.

[0057] In one optional embodiment, the connection terminal of the two rectifier circuits connected in series is connected to a ground terminal. The connection terminal refers to the end where the two rectifier circuits are interconnected. In this embodiment, by connecting the connection terminal of the two rectifier circuits to a ground terminal, both positive and negative DC voltages can be output simultaneously.

[0058] Figure 3 This diagram illustrates another circuit connection between a high-voltage transformer and a rectifier circuit. (As shown in the image) Figure 3 In the example shown, the high-voltage transformer includes one primary winding and n secondary windings. The output terminal of each secondary winding is connected to a rectifier circuit, and there are a total of n rectifier circuits. The rectifier circuits corresponding to two adjacent secondary windings are connected in series. The connection terminal of the two rectifier circuits is connected to the ground terminal GND. The n / 2 rectifier circuits connected in series form the output terminal HV+, which is used to output positive DC voltage. The other n / 2 rectifier circuits connected in series form the output terminal HV-, which is used to output negative DC voltage.

[0059] In one alternative implementation, two adjacent coils in two adjacent secondary windings are staggered.

[0060] In such Figure 4 In the example shown, the high-voltage transformer includes m secondary windings, each of which includes two coils, located on different layers of the PCB board. That is, the 2m coils of the m secondary windings are located on 2m layers of the PCB board. Figure 4 As can be seen, adjacent coils in secondary winding 1 and secondary winding 2 are staggered, that is, the coils located on the 2nd and 3rd layers of the PCB are staggered; adjacent coils in secondary winding m-1 and secondary winding m are staggered, that is, the coils located on the 2m-2 and 2m-1 layers of the PCB are staggered.

[0061] In this embodiment, by staggering the two adjacent coils in two adjacent secondary windings, the facing area between the secondary windings can be reduced, thereby reducing the parasitic capacitance between the secondary windings, which is suitable for high-frequency operation of high-voltage transformers.

[0062] In one optional embodiment, each secondary winding in at least a portion of the secondary windings includes at least two coils, wherein adjacent coils in the secondary windings are staggered. In this embodiment, either a portion of the secondary windings may include at least two coils, or all secondary windings may include at least two coils.

[0063] In such Figure 4 In the example shown, the two coils in secondary winding 1 are staggered, that is, the coils located on the 1st and 2nd layers of the PCB are staggered; the two coils in secondary winding 2 are staggered, that is, the coils located on the 3rd and 4th layers of the PCB are staggered; and so on, the two coils in secondary winding m are staggered, that is, the coils located on the 2m-1th and 2mth layers of the PCB are staggered.

[0064] In this embodiment, by staggering the arrangement of two adjacent coils in the secondary winding, the area between the coils in the secondary winding can be reduced, thereby reducing the parasitic capacitance in the secondary winding, which is suitable for high-frequency operation of high-voltage transformers.

[0065] In one alternative implementation, each of the secondary windings in at least a portion includes at least two coils, which are respectively disposed on different layers of the PCB board, and the routing directions of two adjacent coils in the secondary windings are opposite.

[0066] It should be noted that the winding direction of the coil refers to the winding direction from one end of the coil to the other. In order for the secondary winding to output AC voltage, the winding directions of two adjacent coils in the secondary winding need to be set to opposite directions. Assuming that the secondary winding includes coil c1 and coil c2, and coil c1 and coil c2 have ends A and B respectively, and ends A of coil c1 and C2 are connected, then the winding direction from end A to end B of coil c1 is opposite to the winding direction from end A to end B of coil c2.

[0067] In practice, coils located on different layers of a PCB can be connected together via vias to achieve series connection between two layers of coils. The secondary winding formed by coils located on different layers of the PCB can also be called the PCB secondary winding.

[0068] In such Figure 5 and 6In the example shown, the high-voltage transformer includes m secondary windings, each connected to a corresponding rectifier circuit. Each secondary winding includes two coils, which are respectively located on different layers of a PCB board. Figure 5 As can be seen, in each secondary winding, the wiring direction of one coil is clockwise, and the wiring direction of the other coil is counterclockwise. From... Figure 6 As can be seen, all m rectifier circuits are set in the top layer of the PCB board and arranged in a ring. The m rectifier circuits are connected in series to achieve voltage boost, forming the output terminals HV1+ and HV1-.

[0069] In such Figure 7 In the example shown, with Figure 5 The difference is that the high-voltage transformer includes m / 2 secondary windings, each of which is connected to a corresponding rectifier circuit. Since all rectifier circuits are voltage doubler rectifier circuits, the output terminals HV1+ and HV1- formed by connecting m / 2 rectifier circuits in series are connected to... Figure 5 The output terminals HV1+ and HV1- can output the same voltage.

[0070] In an alternative embodiment, each of the secondary windings, at least in part, includes a coil, and the different secondary windings are respectively disposed on different layers of the PCB board.

[0071] In such Figure 8 and 9 In the example shown, the high-voltage transformer includes m secondary windings, each connected to a corresponding rectifier circuit. Each secondary winding includes a coil, and the m coils are distributed across m layers of the PCB board. Figure 9 As can be seen, all m rectifier circuits are set in the top layer of the PCB board and arranged in a ring. The m rectifier circuits are connected in series to achieve voltage boost, forming the output terminals HV1+ and HV1-.

[0072] In one alternative implementation, the routing directions of two adjacent coils in two adjacent secondary windings are the same.

[0073] In order to reduce the dielectric loss caused by the AC voltage output of adjacent secondary windings, in this embodiment, the routing direction of the two adjacent coils in the two adjacent secondary windings is set to be the same. This makes the voltage between the two adjacent coils in the two adjacent secondary windings a DC voltage, thereby reducing the dielectric loss caused by high-frequency AC.

[0074] In such Figure 10In the example shown, the high-voltage transformer includes a secondary winding A and a secondary winding B. The secondary winding A is connected to rectifier circuit a, and the secondary winding B is connected to rectifier circuit b. The wiring directions between two adjacent coils in the secondary winding A and the secondary winding B are the same, and the voltage Vab between them is a DC voltage.

[0075] In one optional implementation, the number of PCBs is at least two, and the rectifier circuits in two adjacent PCBs are connected in series with resistors.

[0076] In such Figure 11 In the example shown, the high-voltage transformer includes one primary winding and n secondary windings. Each PCB board has m secondary windings, and n / m PCB boards are stacked. The primary winding and all secondary windings are mounted on a single magnetic core. The rectifier circuits on adjacent PCB boards are connected via a connecting board. In a practical implementation, the rectifier circuits on adjacent PCB boards can also be connected in series via resistors on the connecting board, such as... Figure 12 As shown.

[0077] In one optional embodiment, the number of magnetic pillars is at least two, and the position and number of secondary windings on each magnetic pillar are the same. The secondary windings on the same position on different magnetic pillars are arranged on the same PCB board.

[0078] In such Figure 13 and 14 In the example shown, the high-voltage transformer includes two primary windings and n secondary windings. The magnetic core includes two magnetic posts. One primary winding and its corresponding secondary winding are mounted on one magnetic post, and the other primary winding and its corresponding secondary winding are mounted on the other magnetic post. The positions and number of secondary windings mounted on the two magnetic posts are the same, and the secondary windings mounted at the same positions on the two magnetic posts are located on the same PCB board. Each PCB board has m secondary windings and m rectifier circuits, for a total of n / m PCB boards. Figure 14 As can be seen, in the topmost PCB board, m rectifier circuits are all set in the top layer of the PCB board. Among them, m / 2 rectifier circuits are arranged in a ring around a magnetic pillar, and the other m / 2 rectifier circuits are arranged in a ring around another magnetic pillar. The m rectifier circuits are connected in series to achieve voltage boost, forming the output terminals HV1+ and HV1-.

[0079] In such Figure 15In the example shown, the high-voltage transformer includes two primary windings and n secondary windings. The magnetic core includes two magnetic pillars. One primary winding and its corresponding secondary winding are mounted on one magnetic pillar, and the other primary winding and its corresponding secondary winding are mounted on the other magnetic pillar. Each PCB board has m secondary windings and m rectifier circuits. There are a total of n / m PCB boards. The connection terminal between two adjacent PCB boards in the middle is connected to the ground terminal GND. The negative high voltage output at the output terminal HV- is located on the upper side of the magnetic core, and the positive high voltage output at the output terminal HV+ is located on the lower side of the magnetic core.

[0080] In such Figure 16 In the example shown, with Figure 15 The difference is that the output terminals of the rectifier circuits on the top and bottom PCBs are connected to the ground terminal GND respectively. The negative high voltage output by the output terminal HV- is located on the upper right side of the magnetic core, and the positive high voltage output by the output terminal HV+ is located on the lower left side of the magnetic core.

[0081] In one optional implementation, the number of turns in different secondary windings gradually decreases along the direction away from the ground terminal. The voltage between the output terminal and the ground terminal of different layers of secondary windings gradually increases along the direction away from the ground terminal. By setting the number of turns in the secondary windings located in different layers to gradually decrease along the direction away from the ground terminal, the electric field strength among the secondary windings can be made more uniform.

[0082] The direction away from the ground terminal refers to the direction from the ground terminal to the output terminal (e.g., the output terminal HV+ or output terminal HV- mentioned above). It should be noted that the number of turns in the secondary winding gradually decreases along the direction away from the ground terminal, which does not mean that the number of turns in each secondary winding between the output terminal and the ground terminal must be different; it is also possible for some secondary windings to have the same number of turns.

[0083] In one optional embodiment, the insulation distance between the secondary winding and the corresponding primary winding gradually increases in the direction away from the grounding terminal. Specifically, the voltage between the output terminal and the grounding terminal of different layers of secondary windings gradually increases in the direction away from the grounding terminal. By setting the insulation distance between the secondary windings and the corresponding primary windings in different layers to gradually increase in the direction away from the grounding terminal—that is, by arranging the insulation distance between the secondary and primary windings in a gradient from small to large—the voltage difference between the primary and secondary windings can be made more uniform, thereby making the electric field strength between the primary and secondary windings more uniform. The size of the insulation space can be fully utilized, which is beneficial for reducing the overall volume of the high-voltage transformer.

[0084] It should be noted that the insulation distance between the secondary winding and the corresponding primary winding gradually increases in the direction away from the grounding terminal. This does not mean that the insulation distance between each secondary winding and the primary winding between the output terminal and the grounding terminal must be different. It is also possible that the insulation distance between some secondary windings and the primary winding is the same.

[0085] In such Figure 17 In the example shown, the high-voltage transformer includes a core assembly, two primary windings, and multiple secondary windings. The core assembly is composed of two U-shaped cores and includes two magnetic posts. One primary winding and its corresponding secondary winding are mounted on one magnetic post, and the other primary winding and its corresponding secondary winding are mounted on the other magnetic post. Assuming the grounding terminal is at the bottom, the insulation distance between the secondary winding and its corresponding primary winding gradually increases from bottom to top, as shown below. Figure 17 As shown, this can make the voltage difference between the primary and secondary windings more uniform.

[0086] In such Figure 18 In the example shown, the high-voltage transformer includes a core assembly, a primary winding, and multiple secondary windings. The core assembly is composed of two U-shaped cores and includes two magnetic posts. The primary winding and the corresponding secondary winding are mounted on one of the magnetic posts. Assuming the grounding terminal is at the bottom, the insulation distance between the secondary winding and the primary winding gradually increases from bottom to top, as shown below. Figure 18 As shown, this can make the voltage difference between the primary and secondary windings more uniform.

[0087] In such Figure 19 In the example shown, the high-voltage transformer includes a core assembly, a primary winding, and multiple secondary windings. The core assembly is composed of two E-type cores and includes three magnetic posts. The primary winding and the corresponding secondary winding are both mounted on the middle magnetic post. Assuming the grounding terminal is at the bottom, the insulation distance between the secondary winding and the primary winding gradually increases from bottom to top, as shown... Figure 19 As shown, this can make the voltage difference between the primary and secondary windings more uniform.

[0088] In such Figure 20 In the example shown, the high-voltage transformer includes a core assembly, a primary winding, and multiple secondary windings. The core assembly is composed of four U-shaped cores and includes three magnetic pillars. The primary winding and the corresponding secondary winding are both mounted on the middle magnetic pillar. Assuming the grounding terminal is at the bottom, the insulation distance between the secondary winding and the primary winding gradually increases from bottom to top, as shown... Figure 20 As shown, this can make the voltage difference between the primary and secondary windings more uniform.

[0089] In such Figure 21In the example shown, the high-voltage transformer includes a core assembly, three primary windings, and multiple secondary windings. The core assembly is composed of two E-type cores and includes three magnetic posts. One primary winding and its corresponding secondary winding are mounted on the left magnetic post, the second primary winding and its corresponding secondary winding are mounted on the middle magnetic post, and the third primary winding and its corresponding secondary winding are mounted on the right magnetic post. Assuming the grounding terminal is at the bottom, the insulation distance between the secondary winding and its corresponding primary winding gradually increases from bottom to top, as shown below. Figure 21 As shown, this can make the voltage difference between the primary and secondary windings more uniform.

[0090] Continue to refer to Figure 20 and Figure 21 , Figure 21 The core window of the medium core assembly is larger than Figure 20 The core window of the middle core assembly. Figure 21 The width of the core window in the middle core assembly is approximately... Figure 20 The core window width is twice that of the core assembly. In practical implementation, by selecting a core assembly corresponding to a core window of appropriate width, a high-voltage transformer with a gradient arrangement of secondary windings can be formed.

[0091] In one optional embodiment, the primary winding and the corresponding secondary winding are mounted on different magnetic posts, and the insulation distance between the secondary winding and the magnetic post gradually increases in the direction away from the grounding end. The voltage between the output terminal and the grounding end of different layers of secondary windings gradually increases in the direction away from the grounding end. By setting the insulation distance between the secondary windings located on different layers and the magnetic posts they are mounted on to gradually increase in the direction away from the grounding end—that is, by arranging the insulation distance between the secondary windings and the magnetic posts in a gradient from small to large—the voltage difference between the secondary windings can be made more uniform, thereby making the electric field strength between the secondary windings more uniform. The size of the insulation space can be fully utilized, which is beneficial for reducing the overall volume of the high-voltage transformer.

[0092] It should be noted that the insulation distance between the secondary winding and the magnetic post gradually increases in the direction away from the grounding terminal. This does not mean that the insulation distance between each secondary winding and the magnetic post between the output terminal and the grounding terminal must be different. It is also possible that some secondary windings have the same insulation distance from the magnetic post.

[0093] In such Figure 22 In the example shown, the high-voltage transformer includes a core assembly, a primary winding, and multiple secondary windings. The core assembly is composed of two U-shaped cores and includes two magnetic posts. The primary winding is mounted on one of the magnetic posts, and the secondary winding is mounted on the other magnetic post. Assuming the grounding terminal is at the bottom, the insulation distance between the secondary winding and the magnetic post gradually increases in the direction away from the grounding terminal, as shown below. Figure 22As shown, this can make the voltage difference between the secondary windings more uniform.

[0094] Example 2

[0095] This embodiment provides a medical device, including the high-voltage transformer described in Embodiment 1.

[0096] The medical device may be a CT (Computed Tomography) device, a DSA (Digital Subtraction Angiography) device, a DR (Digital Radiography) device, etc.

[0097] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention 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 the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A high-voltage transformer, characterized in that, It includes a magnetic core assembly, at least one primary winding and multiple secondary windings. The magnetic core assembly includes at least one magnetic post, and the primary winding corresponds to multiple secondary windings. The primary winding and the secondary winding are sleeved on the magnetic post. The secondary windings corresponding to the primary windings are stacked and arranged on the PCB board, and each secondary winding includes at least one coil. Each secondary winding in at least a portion of the secondary windings includes at least two coils, which are respectively disposed on different layers of the PCB board, and the routing directions of two adjacent coils in the secondary windings are opposite; In two adjacent secondary windings, the routing directions of the two adjacent coils are the same.

2. The high-voltage transformer as described in claim 1, characterized in that, In two adjacent secondary windings, the two adjacent coils are staggered.

3. The high-voltage transformer as described in claim 1, characterized in that, Each secondary winding in at least a portion of the secondary windings includes at least two coils, wherein adjacent coils in the secondary windings are staggered.

4. The high-voltage transformer as described in claim 1, characterized in that, Each secondary winding is connected to a corresponding rectifier circuit, and the rectifier circuit and the corresponding secondary winding are located on the same PCB board. The rectifier circuits corresponding to two adjacent secondary windings are connected in series.

5. The high-voltage transformer as described in claim 4, characterized in that, A capacitor is connected in parallel between the output terminals of the rectifier circuit.

6. The high-voltage transformer as described in claim 4, characterized in that, The rectifier circuit is a voltage doubler rectifier circuit.

7. The high-voltage transformer as described in claim 4, characterized in that, The connection terminals of the two rectifier circuits connected in series are connected to the ground terminal.

8. The high-voltage transformer as described in claim 4, characterized in that, The number of PCBs is at least two, and the rectifier circuits in two adjacent PCBs are connected in series with resistors.

9. The high-voltage transformer as described in claim 1, characterized in that, The number of turns in different secondary windings gradually decreases along the direction away from the grounding terminal.

10. The high-voltage transformer as described in claim 1, characterized in that, The insulation distance between the secondary winding and the corresponding primary winding gradually increases in the direction away from the grounding end.

11. The high-voltage transformer as described in claim 1, characterized in that, The primary winding and the corresponding secondary winding are mounted on different magnetic posts, and the insulation distance between the secondary winding and the magnetic post gradually increases in the direction away from the grounding end.

12. The high-voltage transformer as described in claim 1, characterized in that, The magnetic core assembly is composed of at least two magnetic cores.

13. The high-voltage transformer as described in claim 1, characterized in that, The number of magnetic pillars is at least two, and the position and number of secondary windings on each magnetic pillar are the same. The secondary windings on the same position on different magnetic pillars are arranged on the same PCB board.

14. A medical device, characterized in that, Including the high-voltage transformer as described in any one of claims 1-13.

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