Transformer and vehicle power supply

Abstract

This application provides a transformer and an on-board power supply, relating to the field of transformer technology. The transformer includes a winding assembly and a core assembly. The winding assembly includes a first coil winding, a second coil winding, and a lamellar winding. The core assembly includes a first core, which has a first receiving cavity for accommodating the first coil winding, the second coil winding, and the lamellar winding. When the first coil winding serves as the input winding in a first transformer operating mode, the second coil winding is the corresponding output winding. When the lamellar winding serves as the output winding in a second transformer operating mode, the second coil winding is the corresponding input winding. The transformer of this application can simultaneously achieve two transformer functions while reducing installation space requirements.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of transformer technology, and in particular to a transformer and an on-board power supply. Background Technology

[0002] Electric vehicles typically require two types of transformers: on-board charger (OBC) transformers and direct current to direct current (DCDC) transformers. Currently, OBC and DCDC transformers are usually installed independently, but this method often requires significant installation space. As the demands of electric vehicle applications increase, the available installation space for OBC and DCDC transformers is gradually decreasing, making existing OBC and DCDC transformers insufficient to meet installation requirements. Utility Model Content

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims. Embodiments of this application provide a transformer and an on-board power supply that can simultaneously achieve the functions of two transformers while reducing installation space requirements.

[0004] In a first aspect, the transformer according to the embodiments of this application includes: A winding assembly, comprising a first coil winding, a second coil winding, and a lamellar winding; A magnetic core assembly, the magnetic core assembly including a first magnetic core, the first magnetic core being provided with a first receiving cavity for accommodating a first coil winding, a second coil winding, and a sheet winding; Wherein, when the first coil winding is used as the input winding of the first transformer operating mode, the second coil winding is the output winding corresponding to the first coil winding; when the lamellar winding is used as the output winding of the second transformer operating mode, the second coil winding is the input winding corresponding to the lamellar winding.

[0005] Therefore, the above embodiments of this application have at least the following beneficial effects: by setting the lamellar winding as lamellar and the remaining windings as coil windings, the first coil winding, the second coil winding, and the lamellar winding can be integrated into the same first receiving cavity through the first magnetic core. Furthermore, by using the first coil winding and the second coil winding as the input and output windings of the first transformer operating mode, respectively, a first type of transformer function is achieved. By using the second coil winding and the lamellar winding as the input and output windings of the second transformer operating mode, a second type of transformer function is achieved. Thus, by repeatedly utilizing the magnetic integration of the second coil winding and the first magnetic core, two different types of transformers can be magnetically integrated while reducing the installation space requirement. Therefore, compared with related technologies, the transformer of the embodiments of this application can simultaneously achieve two transformer functions while reducing the installation space requirement.

[0006] According to some embodiments of the first aspect of this application, the first magnetic core includes a first magnetic core body portion, a first magnetic post, a second magnetic core body portion, and a second magnetic post. The first magnetic post protrudes from the first magnetic core body portion, and the second magnetic post protrudes from the second magnetic core body portion. The first magnetic post and the second magnetic post are arranged opposite to each other, and the first magnetic core body portion, the first magnetic post, the second magnetic core body portion, and the second magnetic post surround to form the first receiving cavity.

[0007] According to some embodiments of the first aspect of this application, the winding assembly further includes a first inductor winding, and the magnetic core assembly further includes a second magnetic core, the second magnetic core being provided with a second receiving cavity for accommodating the first inductor winding, the first inductor winding and the first coil winding being continuously wound with the same wire.

[0008] According to some embodiments of the first aspect of this application, the second magnetic core includes a third magnetic core body and a third magnetic post, wherein the third magnetic core body, the third magnetic post, and a first side surface of the first magnetic core enclose the second receiving cavity.

[0009] According to some embodiments of the first aspect of this application, the transformer further includes a first frame and a second frame, wherein the first coil winding and the second coil winding are wound on the first frame, and the first inductor winding is wound on the second frame.

[0010] According to some embodiments of the first aspect of this application, two sheet windings are provided, and the two sheet windings are respectively arranged around the first coil winding and the second coil winding.

[0011] According to some embodiments of the first aspect of this application, the magnetic core assembly further includes a third magnetic core; the winding assembly further includes a second inductor winding, the third magnetic core is provided with a third receiving cavity for accommodating the second inductor winding, the first end of the second inductor winding and the first ends of the two sheet windings are electrically connected, and the second end of the second inductor winding is used to connect a load.

[0012] According to some embodiments of the first aspect of this application, the transformer further includes a base, on which a plurality of fixing holes are provided, the fixing holes being correspondingly provided with connection ends of the second inductor winding, the first coil winding, the second coil winding and the two sheet windings.

[0013] According to some embodiments of the first aspect of this application, the third magnetic core includes a fourth magnetic core body portion, a fifth magnetic core body portion, a fourth magnetic post, and a fifth magnetic post. The fourth magnetic post protrudes from the fourth magnetic core body portion, and the fifth magnetic post protrudes from the fifth magnetic core body portion. The fourth magnetic post and the fifth magnetic post are disposed in abutment against each other, and no air gap is formed on the inductive magnetic post formed by the fourth magnetic post and the fifth magnetic post. The fourth magnetic core body portion, the fifth magnetic core body portion, the fourth magnetic post, and the fifth magnetic post enclose the third receiving cavity.

[0014] Secondly, the vehicle power supply proposed according to the embodiments of this application includes any of the transformers described in the first aspect. Attached Figure Description

[0015] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the transformer provided in this application; Figure 2 This is a top view of one embodiment of the transformer provided in this application; Figure 3 yes Figure 2 The diagram shown is an exploded view of the transformer. Figure 4a This is a schematic diagram of the secondary current flow of a transformer in one embodiment of the first transformer operating mode provided in this application. Figure 4b This is a transformer current routing diagram of one embodiment of the transformer provided in the second transformer operating mode according to the present application. Figure 4cThis is a schematic diagram of the primary current flow of the transformer after adding a first inductor winding in one embodiment of the transformer operating mode provided in this application. Figure 5 This is a top view of the transformer provided in one embodiment of this application; Figure 6a This is an equivalent circuit diagram of the transformer provided in the embodiments of this application under the first transformer operating mode; Figure 6b This is an equivalent circuit diagram of the transformer provided in the embodiments of this application in the second transformer operating mode.

[0017] Figure label: First coil winding 110, second coil winding 120, plate winding 130, first inductor winding 140, second inductor winding 150 First magnetic core 210, first magnetic core body 211, first magnetic pillar 212, second magnetic core body 213, second magnetic pillar 214, second magnetic core 220, third magnetic core body 221, third magnetic pillar 222, third magnetic core 230, fourth magnetic core body 231, fourth magnetic pillar 232, fifth magnetic core body 233, fifth magnetic pillar 234 First skeleton 310, second skeleton 320 Base 400, mounting hole 410 Copper sheet 500. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application. The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0020] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0021] Firstly, referring to Figures 1 to 3 As shown, the transformer according to an embodiment of this application includes: The winding assembly includes a first coil winding 110, a second coil winding 120, and a sheet winding 130. The magnetic core assembly includes a first magnetic core 210, which has a first receiving cavity for accommodating a first coil winding 110, a second coil winding 120, and a sheet winding 130. When the first coil winding 110 serves as the input winding of the first transformer operating mode, the second coil winding 120 serves as the output winding corresponding to the first coil winding 110. When the lamellar winding 130 serves as the output winding of the second transformer operating mode, the second coil winding 120 serves as the input winding corresponding to the lamellar winding 130.

[0022] Therefore, by setting the lamellar winding 130 as lamellar and the remaining windings as coil windings, the first coil winding 110, the second coil winding 120, and the lamellar winding 130 can be integrated into the same first receiving cavity through the first magnetic core 210. Furthermore, by using the first coil winding 110 and the second coil winding 120 as the input and output windings respectively in the first transformer operating mode, a first type of transformer function is achieved. By using the second coil winding 120 and the lamellar winding 130 as the input and output windings respectively in the second transformer operating mode, a second type of transformer function is achieved. Thus, by repeatedly utilizing the magnetic integration of the second coil winding 120 and the first magnetic core 210, two different types of transformers can be magnetically integrated while reducing the installation space requirement. Therefore, the transformer of this embodiment can simultaneously achieve two transformer functions while reducing the installation space requirement.

[0023] The number of sheet windings 130 in this application embodiment is not limited. For example, it can be set to two sheets, with the two windings respectively surrounding the first coil winding 110 and the second coil winding 120. In some embodiments, the sheet winding 130 can also be set to one sheet, which surrounds the second coil winding 120. The sheet winding 130 is an arc-shaped winding used to sense the magnetic field generated by the second coil winding 120, thereby generating a corresponding current and voltage.

[0024] In this embodiment, there are no restrictions on the width, quantity, material, or number of turns of the wires wound in the first coil winding 110 and the second coil winding 120. Those skilled in the art can selectively set these parameters according to actual output requirements.

[0025] The embodiments of this application do not limit the structure of the first magnetic core 210, and those skilled in the art can selectively set it according to actual needs.

[0026] This application does not limit the types of the first and second transformer operating modes, but the power input types to the input windings differ between the first and second transformer operating modes. In some embodiments, the first transformer operating mode indicates power supply based on the OBC transformer operating principle, where the first coil winding 110, the second coil winding 120, and the first magnetic core 210 combine to form the OBC transformer. The second transformer operating mode indicates power supply based on the DC-DC transformer operating principle, where the second coil winding 120, the lamellar winding 130, and the first magnetic core 210 combine to form the DC-DC transformer. In other embodiments, the first transformer operating mode indicates power supply based on the DC-DC transformer operating principle, where the first coil winding 110, the second coil winding 120, and the first magnetic core 210 combine to form the DC-DC transformer, and the second transformer operating mode indicates power supply based on the OBC transformer operating principle, where the second coil winding 120, the lamellar winding 130, and the first magnetic core 210 combine to form the OBC transformer. At this time, the first magnetic core 210, the first coil winding 110, the second coil winding 120 and the sheet winding 130 enable the same transformer to have the functions of two different transformers.

[0027] For example, taking the first transformer operating in OBC transformer mode and the second transformer operating in DC-DC transformer mode as an example, when the transformer is in OBC transformer mode, the first coil winding 110 acts as the primary winding, and the second coil winding 120 acts as the secondary winding. The current in the secondary winding is as follows: Figure 4a As shown, both the primary and secondary coils pass through the first magnetic core 210. At this time, the excitation inductance of the transformer can be adjusted by adjusting the air gap on the magnetic column in the first magnetic core 210.

[0028] For example, taking the first transformer operating in OBC transformer mode and the second transformer operating in DC-DC transformer mode as an example, when the transformer is in DC-DC transformer mode, the second coil winding 120 serves as the primary winding, and its current flow is as follows. Figure 4b As shown in the left figure; the lamellar winding 130 serves as the secondary winding, and its current flow is as follows. Figure 4b As shown in the right figure, since the second coil winding 120 and the sheet winding 130 are both located in the first receiving cavity, the primary and secondary windings pass through the first magnetic core 210. At this time, the peak current of the transformer can be adjusted by adjusting the air gap on the magnetic column of the first magnetic core 210.

[0029] Therefore, the embodiments of this application can realize that the OBC transformer and the DCDC transformer share a magnetic core and a winding, wherein the output winding of the OBC transformer and the input winding of the DCDC transformer are the same winding, thereby reducing the size and production cost.

[0030] Understandably, referring to Figure 3 As shown, the first magnetic core 210 includes a first magnetic core body portion 211, a first magnetic post 212, a second magnetic core body portion 213, and a second magnetic post 214. The first magnetic post 212 protrudes from the first magnetic core body portion 211, and the second magnetic post 214 protrudes from the second magnetic core body portion 213. The first magnetic post 212 and the second magnetic post 214 are arranged opposite to each other. The first magnetic core body portion 211, the first magnetic post 212, the second magnetic core body portion 213, and the second magnetic post 214 enclose a first receiving cavity.

[0031] Reference Figure 3 As shown, both the first magnetic core body 211 and the second magnetic core body 213 are concave magnetic core structures. By dividing the first magnetic core 210 into the first magnetic core body 211 and the second magnetic core body 213, it is easier to assemble the first magnetic core 210. By setting the first magnetic post 212 and the second magnetic post 214, it is easier to adjust the air gap.

[0032] Understandably, referring to Figures 1 to 3 As shown, the winding assembly also includes a first inductor winding 140, and the magnetic core assembly also includes a second magnetic core 220. The second magnetic core 220 is provided with a second receiving cavity to accommodate the first inductor winding 140. The first inductor winding 140 and the first coil winding 110 are continuously wound with the same wire.

[0033] The phrase "wound continuously with the same wire" indicates that the first inductor winding 140 and the first coil winding 110 are simultaneously wound with the same or multiple identical wires. By setting the first inductor winding 140 and making the first inductor winding and the first coil winding 110 continuously wound with the same wire, the stability of the input voltage when in the first transformer operating mode can be improved, and the size can be further reduced.

[0034] Understandably, referring to Figure 3 As shown, the second magnetic core 220 includes a third magnetic core body 221 and a third magnetic post 222. The third magnetic core body 221, the third magnetic post 222 and the first side of the first magnetic core 210 enclose a second receiving cavity.

[0035] The resonant inductance at input can be adjusted by adjusting the air gap of the third magnetic post 222.

[0036] For example, refer to Figure 4c As shown, taking the first transformer operating in OBC transformer mode and the second transformer operating in DC-DC transformer mode as an example, when the transformer is in OBC transformer mode, the first coil winding 110 serves as the primary winding, and the second coil winding 120 serves as the secondary winding. The primary winding passes through the first magnetic core 210 and the second magnetic core 220. The first magnetic core 210 serves as the core of the OBC transformer, and the second magnetic core 220 serves as the resonant inductor during input. At this time, the input current is as follows: Figure 4c As shown.

[0037] Understandably, referring to Figure 3 As shown, the transformer also includes a first frame 310 and a second frame 320, a first coil winding 110 and a second coil winding 120 are wound on the first frame 310, and a first inductor winding 140 is wound on the second frame 320.

[0038] By adding the first frame 310 and the second frame 320, the ease of winding the first coil winding 110, the second coil winding 120 and the first inductor winding 140 can be improved, as can the stability of the first coil winding 110, the second coil winding 120 and the first inductor winding 140.

[0039] For example, refer to Figure 2 and Figure 3As shown, the end portion of the first magnetic core body 211, where the first side surface is located, is embedded in the first end portion of the first frame 310. The end portion of the second magnetic core body 213, where the third side surface is located opposite to the first side surface, is at least partially embedded in the second end portion of the second frame 320, thereby clamping the first frame 310 within the first receiving cavity through the first magnetic core body 211 and the second magnetic core body 213. The end portion of the first magnetic core body 211, where the first side surface is located, is embedded in the first end portion of the second frame 320. The end portion of the third magnetic core body 221, where the side surface is located opposite to the first side surface, is embedded in the second end portion of the second frame 320, thereby clamping the second frame 320 through the first magnetic core 210 and the second magnetic core 220.

[0040] Understandably, referring to Figures 1 to 3 As shown, there are two sheet windings 130, which are arranged around the first coil winding 110 and the second coil winding 120 respectively.

[0041] For example, such as Figure 1 and Figure 3 As shown, both sheet windings 130 are arc-shaped and are horizontally distributed at intervals.

[0042] Understandably, referring to Figure 3 As shown, the magnetic core assembly also includes a third magnetic core 230; the winding assembly also includes a second inductor winding 150. The third magnetic core 230 is provided with a third receiving cavity for accommodating the second inductor winding 150. The first end of the second inductor winding 150 and the first ends of the two sheet windings 130 are electrically connected. The second end of the second inductor winding 150 is used to connect the load.

[0043] For example, refer to Figure 1 , Figure 3 As shown, the first inductor winding 140, the first coil winding 110, the second coil winding 120 and the second inductor winding 150 are arranged horizontally in sequence, and two sheet windings 130 are arranged around the first coil winding 110 and the second coil winding 120 respectively.

[0044] Understandably, referring to Figure 1 and Figure 5 As shown, the transformer also includes a base 400, on which a plurality of fixing holes 410 are provided. The fixing holes 410 are correspondingly provided with the connection ends of the second inductor winding 150, the first coil winding 110, the second coil winding 120 and the two sheet windings 130.

[0045] For example, taking the first coil winding 110 as an example, which is formed by winding a single wire, and the wire forms a first inductor winding 140 and a first coil winding 110 arranged sequentially, and the second coil winding 120 as an example, which is also formed by winding a single wire, as follows... Figure 5 As shown, four fixing holes 410 are provided at the first end of the base 400, two of which are used to fix the two ends of the wire forming the first coil winding 110 (e.g., Figure 5 As shown, the wires passing through the first two fixing holes correspond to the first inductor winding 140 and the first coil winding 110, respectively. The other two fixing holes 410 are used to fix the two ends of the second coil winding 120. Four fixing holes arranged in two rows are also provided in the middle of the base 400, used to fix the four ends of the two sheet windings 130, respectively. Two fixing holes are provided at the second end of the base 400, used to fix the two ends of the second inductor winding 150, respectively. In some embodiments, such as... Figure 5 As shown, a copper sheet 500 is also provided on the base 400, and the output terminals of the two sheet windings 130 and the input terminal of the second inductor winding 150 are electrically connected through the copper sheet 500.

[0046] Understandably, referring to Figure 3 As shown, the third magnetic core 230 includes a fourth magnetic core body 231, a fifth magnetic core body 233, a fourth magnetic post 232, and a fifth magnetic post 234. The fourth magnetic post 232 protrudes from the fourth magnetic core body 231, and the fifth magnetic post 234 protrudes from the fifth magnetic core body 233. The fourth magnetic post 232 and the fifth magnetic post 234 are arranged in abutting position against each other, and no air gap is opened on the inductive magnetic post formed by the fourth magnetic post 232 and the fifth magnetic post 234. The fourth magnetic core body 231, the fifth magnetic core body 233, the fourth magnetic post 232, and the fifth magnetic post 234 enclose and form a third receiving cavity.

[0047] By not opening an air gap on the inductive magnetic pillars formed by the fourth magnetic pillar 232 and the fifth magnetic pillar 234, high-frequency loss and magnetic leakage can be prevented.

[0048] For example, refer to Figures 1-3 as well as Figure 6a , Figure 6b The transformer described in the above embodiments of this application. For example... Figures 1 to 3As shown, the transformer includes a third magnetic core body 221, a first inductor winding 140, a first magnetic core body 211, a first coil winding 110, a second coil winding 120, a second magnetic core body 213, a fourth magnetic core body 231, a second inductor winding 150, and a fifth magnetic core body 233 arranged horizontally in sequence. A third magnetic post 222 is embedded in a second frame 320, which is embedded in the hollow part of the first inductor winding 140. The first magnetic post 212 and the second magnetic post 214 are both embedded in the first frame 310, and air gaps are formed on the first magnetic post 212 and / or the second magnetic post 214. The first frame 310 is embedded in the hollow part of the first coil winding 110 and the second coil winding 120. Two arc-shaped sheet windings 130 are respectively arranged corresponding to the first coil winding 110 and the second coil winding 120. At this time, when the transformer is in the first transformer operating mode, the equivalent circuit diagram of the transformer is as follows: Figure 6a As shown, the first inductor winding 140 is N1, the first coil winding 110 is N2, and the second coil winding 120 is N3. At this time, current enters from terminal 1 of N1 and exits from terminal 2 of N2, forming a closed loop on the primary side. Current in N3 flows from terminal 3 to terminal 4. When the transformer is in the second transformer operating mode, the equivalent circuit diagram of the transformer is as follows. Figure 6b As shown, the second coil winding 120 is N3, the two plate windings 130 are N5 and N4 respectively, and the second inductor winding 150 is N6, as... Figure 6b As shown, the current enters from pin 3 of N3 and exits from pin 4. The current of N5 flows from pin 6 to N6, and the current of N4 flows from pin 5 to N6.

[0049] Secondly, the vehicle power supply proposed according to the embodiments of this application includes any of the transformers described in the first aspect.

[0050] The above is a detailed description of the preferred embodiments of this application. However, this application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A transformer, characterized in that, include: A winding assembly, comprising a first coil winding, a second coil winding, and a lamellar winding; A magnetic core assembly, the magnetic core assembly including a first magnetic core, the first magnetic core being provided with a first receiving cavity for accommodating a first coil winding, a second coil winding, and a sheet winding; Wherein, when the first coil winding is used as the input winding of the first transformer operating mode, the second coil winding is the output winding corresponding to the first coil winding; when the lamellar winding is used as the output winding of the second transformer operating mode, the second coil winding is the input winding corresponding to the lamellar winding.

2. The transformer according to claim 1, characterized in that, The first magnetic core includes a first magnetic core body, a first magnetic post, a second magnetic core body, and a second magnetic post. The first magnetic post protrudes from the first magnetic core body, and the second magnetic post protrudes from the second magnetic core body. The first magnetic post and the second magnetic post are arranged opposite to each other. The first magnetic core body, the first magnetic post, the second magnetic core body, and the second magnetic post enclose the first receiving cavity.

3. The transformer according to claim 1, characterized in that, The winding assembly further includes a first inductor winding, and the magnetic core assembly further includes a second magnetic core. The second magnetic core is provided with a second receiving cavity for accommodating the first inductor winding. The first inductor winding and the first coil winding are continuously wound with the same wire.

4. The transformer according to claim 3, characterized in that, The second magnetic core includes a third magnetic core body and a third magnetic post, wherein the third magnetic core body, the third magnetic post, and the first side of the first magnetic core enclose the second receiving cavity.

5. The transformer according to claim 3, characterized in that, The transformer also includes a first frame and a second frame, with the first coil winding and the second coil winding wound on the first frame, and the first inductor winding wound on the second frame.

6. The transformer according to any one of claims 1 to 5, characterized in that, Two sheet-like windings are provided, and the two sheet-like windings are respectively arranged around the first coil winding and the second coil winding.

7. The transformer according to claim 6, characterized in that, The magnetic core assembly further includes a third magnetic core; the winding assembly further includes a second inductor winding, the third magnetic core is provided with a third receiving cavity for accommodating the second inductor winding, the first end of the second inductor winding and the first ends of the two sheet windings are electrically connected, and the second end of the second inductor winding is used to connect a load.

8. The transformer according to claim 7, characterized in that, The transformer also includes a base, on which a plurality of fixing holes are provided, the fixing holes being corresponding to the connection ends of the second inductor winding, the first coil winding, the second coil winding and the two sheet windings.

9. The transformer according to claim 7, characterized in that, The third magnetic core includes a fourth magnetic core body, a fifth magnetic core body, a fourth magnetic post, and a fifth magnetic post. The fourth magnetic post protrudes from the fourth magnetic core body, and the fifth magnetic post protrudes from the fifth magnetic core body. The fourth and fifth magnetic posts are arranged in abutting position against each other, and no air gap is formed on the inductive magnetic post formed by the fourth and fifth magnetic posts. The fourth magnetic core body, the fifth magnetic core body, the fourth magnetic post, and the fifth magnetic post enclose the third accommodating cavity.

10. A vehicle-mounted power supply, characterized in that, Including the transformer as claimed in any one of claims 1 to 9.

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