Flow comparator

Abstract

The invention discloses a current transformer which comprises an iron core and a current transformer coil. The iron core is formed into a non-closed open shape and is provided with a first contact surface and a second contact surface. The current transformer coil is wound on the outer surface of the iron core. When induction current flows in the current transformer coil, a virtual magnetic line of force penetrates out of the first contact surface or the second contact surface.

Description

Technical Field

[0001] The present invention relates to a current transformer, and in particular to a current transformer that can be used in a transformer. Background Art

[0002] In the field related to alternating current, current transformers are often used to detect the magnitude or frequency of alternating current. For example, in the field of transformers, current transformers are installed inside transformers to monitor the current condition of the transformer. The current transformers in the prior art are composed of a closed iron core and a coil wound around the iron core, and the conductor of the transformer passes through the iron core of the current transformer. When current flows through the conductor passing through the iron core, a magnetic flux is generated that flows along the closed iron core, thereby causing the coil on the iron core to generate an induced current. Users can monitor the current condition of the transformer based on this induced current.

[0003] In the prior art, because the magnetic flux needs to flow along the iron core, the current transformer must be formed into a closed loop, so the iron core is usually formed into a ring shape. The current transformer with a ring-shaped iron core is difficult to be directly fixed to the transformer. Usually, it needs to be fixed to the transformer stably through a base. However, in the field of transformers in recent years, the demand for power density has become increasingly higher, and the installation of the current transformer and the base will occupy the space of the transformer, which is not conducive to improving the power density. Therefore, how to reduce the space required for configuring the current transformer and improve the power density of the transformer has become an important issue. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides a current transformer, including an iron core and a current transformer coil. The iron core is formed into a non-enclosed open shape and has a first contact surface and a second contact surface. The current transformer coil is wound on the outer surface of the iron core. When an induced current flows through the current transformer coil, a virtual magnetic field line passes through the first contact surface or the second contact surface.

[0005] In some embodiments of the present invention, the open shape of the iron core is U-shaped, and the iron core further includes a first leg and a second leg, the first contact surface is located at the end of the first leg, and the second contact surface is located at the end of the second leg.

[0006] In some embodiments of the present invention, the iron core further includes a middle portion connecting the first leg portion and the second leg portion, and the current transformer coil is wound around the middle portion.

[0007] In some embodiments of the present invention, the open shape of the iron core is an I-shape, and the iron core has a top end and a bottom end in the extension direction of the I-shape, the first contact surface is located at the top end, and the second contact surface is located at the bottom end.

[0008] In some embodiments of the present invention, the iron core further includes a middle portion, the middle portion is located in the middle of the length of the I-shape, and the current transformer coil is wound around the middle portion.

[0009] In some embodiments of the present invention, the open shape of the iron core is an arc, the iron core has a first end as the starting point of the arc and a second end as the end point of the arc, the first contact surface is located at the first end, and the second contact surface is located at the second end.

[0010] In some embodiments of the present invention, the iron core further includes a middle portion, the middle portion is located in the middle of the arc length of the arc, and the current transformer coil is wound around the middle portion.

[0011] In some embodiments of the present invention, the aforementioned arc is a semicircle.

[0012] In some embodiments of the present invention, the open shape of the core defines a passing area, and the passing area is adjacent to the current transformer coil.

[0013] In some embodiments of the present invention, the current transformer further includes a current output unit for outputting the induced current generated by the current transformer coil to the outside.

[0014] Through the current transformer provided by the present invention, when current flows through the transformer conductor, a magnetic flux flowing along the closed iron core is generated.

[0015] The present invention uses the above technical features to replace the current transformer with an annular core in the prior art with a current transformer with an open core. The current transformer can be embedded and fixed in the core of the transformer, so there is no need to reserve a base space in the transformer, and the space required for configuring the current transformer is also reduced, thereby achieving the effect of saving space and saving base costs. For the transformer, the current transformer can also achieve the effect of improving the power density of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 1 is a perspective view of a current transformer according to a first embodiment of the present invention.

[0017] Figure 2 It is a perspective view of a transformer using the current transformer according to the first embodiment of the present invention.

[0018] Figure 3 It is a partially exploded perspective view of a transformer using the current transformer according to the first embodiment of the present invention.

[0019] Figure 4 This is a diagram illustrating the use status of the current transformer according to the first embodiment of the present invention.

[0020] Figure 5 FIG. 4 is a perspective view of a current transformer according to a second embodiment of the present invention.

[0021] Figure 6 This is a diagram illustrating the use status of the current transformer according to the second embodiment of the present invention.

[0022] Figure 7 FIG. 4 is a perspective view of a current transformer according to a third embodiment of the present invention.

[0023] Figure 8 1 is a diagram illustrating the use status of a current transformer according to the third embodiment of the present invention.

[0024] Fig. 9 FIG. 4 is a perspective view of a current transformer according to a fourth embodiment of the present invention.

[0025] Fig.10 1 is a diagram illustrating the use status of a current transformer according to a fourth embodiment of the present invention.

[0026] Fig.11 This is an explanatory diagram of another way of installing the current transformer of the present invention in a transformer.

[0027] The following are the descriptions of the reference numerals:

[0028] 1,1”,1”,1”': Current Transformer

[0029] 10,10',10",10"': Iron core

[0030] 11: First Leg

[0031] 12: Second Leg

[0032] 13,13',13",13"': middle part

[0033] 14,14',14",14': First contact surface

[0034] 15,15',15",15'': Second contact surface

[0035] 16: Top

[0036] 17: Bottom

[0037] 18: First End

[0038] 19: Second End

[0039] 20: Current transformer coil

[0040] 30: Passing Zone

[0041] 40: Current output unit

[0042] 100: Transformer

[0043] 110: Iron core

[0044] 111: Upper part

[0045] 112: Middle

[0046] 113: Lower part

[0047] 120: Transformer coil

[0048] 130: Transformer wire

[0049] 140: Groove

[0050] 201: First component

[0051] 202: Second component

[0052] F: Magnetic flux path

[0053] M: Virtual magnetic field lines DETAILED DESCRIPTION

[0054] The above and other technical contents, features and effects of the present invention are described in detail below in conjunction with a preferred embodiment with reference to the accompanying drawings.

[0055] [First embodiment]

[0056] First, please refer to Figure 1 , Figure 1 It is a three-dimensional diagram of the current transformer 1 of the first embodiment of the present invention. In this embodiment, the current transformer 1 includes an iron core 10 and a current transformer coil 20. For the present invention, the iron core 10 only needs to be formed into a non-closed open shape and have at least a first contact surface 14 and a second contact surface 15. It should be particularly noted that the non-closed open shape means that the shape itself does not enclose and define a space, such as a U-shape, an I-shape, an arc shape, an H-shape, etc., but is not limited to this. In contrast, a closed shape is, for example, a ring shape, a rectangular frame shape, a polygonal frame shape, etc.

[0057] like Figure 1 As shown, in this embodiment, the open shape of the iron core 10 is substantially U-shaped. The iron core 10 further includes a first leg 11, a second leg 12, and a middle portion 13. The first contact surface 14 is located at the end of the first leg 11, and the second contact surface 15 is located at the end of the second leg 12. The first contact surface 14 and the second contact surface 15 are surfaces that contact the iron core 110 of the transformer 100 described later.

[0058] Furthermore, the middle portion 13 connects the first leg portion 11 and the second leg portion 12, and the substantially U-shape formed by the middle portion 13, the first leg portion 11 and the second leg portion 12 defines a passing area 30. The current transformer coil 20 is wound around the outer surface of the core 10, that is, around the middle portion 13, and therefore, the current transformer coil 20 is adjacent to the passing area 30.

[0059] Next, please refer to Figure 2 , Figure 2 1 is a perspective view of a transformer 100 using the current transformer 1 according to the first embodiment of the present invention. The transformer 100 includes an iron core 110 and a transformer coil 120. The iron core 110 includes an upper portion 111, a middle portion 112, and a lower portion 113 that can be separated from each other. In this embodiment, the upper portion 111, the middle portion 112, and the lower portion 113 can be separated from each other, but are not limited thereto and can be adjusted according to the structure of the transformer, for example, the iron core 110 can also be integrally formed.

[0060] The transformer coil 120 is accommodated in the space between the upper portion 111 and the middle portion 112 and in the space between the middle portion 112 and the lower portion 113. A groove 140 is formed in the middle portion 112, and the current transformer 1 is fitted into the groove 140. After the current transformer 1 is fitted into the groove 140, the passing area 30 is equivalent to the space of the groove 140 that is not filled by the current transformer 1.

[0061] Next, please refer to Figure 3 , Figure 3 FIG. 1 is a partially exploded perspective view of a transformer 100 using the current transformer of the first embodiment of the present invention. Figure 3 In the figure, a transformer wire 130 extends from the transformer coil 120, and the transformer wire 130 passes through the groove 140 (through the area 30). The current transformer 1 also includes a current output part 40, and both ends of the wire of the current transformer coil 20 are connected to the current output part 40, and the current output part 40 then outputs the induced current generated in the current transformer coil 20 to a monitoring unit, for example.

[0062] In this embodiment, although the shape of the groove 140 can be Figure 3 The groove 140 is shown as a substantially T-shaped shape, but is not limited thereto. Any shape is acceptable as long as it can be engaged with the current transformer 1 and the transformer wire 130 can cause the current transformer coil 20 to generate an induced current. Furthermore, the groove 140 is not limited to being disposed in the middle portion 112. As long as it can be engaged with the current transformer 1 and the transformer wire 130 can cause the current transformer coil 20 to generate an induced current, the groove 140 can be disposed on any surface of the upper portion 111 or on any surface of the lower portion 113.

[0063] Next, please refer to Figure 4 , Figure 4FIG. 1 is a diagram illustrating the use of the current transformer 1 according to the first embodiment of the present invention. Figure 4 As shown, when the current transformer 1 is fitted into the groove 140, the first contact surface 14 of the first leg 11 contacts the surface of the iron core 110 (middle portion 112), and the second contact surface 15 of the second leg 12 contacts the surface of the iron core 110 (middle portion 112). When a current (current direction is inflow or outflow) flows through the transformer wire 130 passing through the groove 140 (through portion 30), a magnetic flux is generated.

[0064] This magnetic flux flows along the iron core 10, flows to the iron core 110 through the first contact surface 14, and then flows to the iron core 10 through the second contact surface 15, that is, along Figure 4 The magnetic flux path F shown in the figure forms a closed loop. At this time, due to the magnetic field induction, an induced current flows through the current transformer coil 20. In other words, when the induced current flows through the current transformer coil 20, it can be considered that there is a virtual magnetic field line M (such as the arrow on the right side of the magnetic flux path F) passing through the first contact surface 14.

[0065] It should be particularly noted that there is no limitation on the size of the induced current output by the current transformer coil 20. For example, the number of turns of the current transformer coil 20 can be changed to make the size of the output induced current equal to the size of the transformer wire 130, or the size of the output induced current can be within the range within which the monitoring unit can operate.

[0066] Furthermore, the current source for generating magnetic flux is not limited to the transformer conductor 130. Any current passing through the closed space surrounded by the core 10 and the transformer 110 (such as the groove 140 or the through portion 30 of the core 10) can be used as the current source for generating magnetic flux.

[0067] In this embodiment, since the current transformer 1 having a U-shaped iron core 10 replaces the current transformer using a ring-shaped iron core in the prior art, the current transformer 1 can be embedded and fixed in the iron core 110 of the transformer 100, so there is no need to reserve a base space in the transformer, and the space required for configuring the current transformer 1 is also reduced, thereby achieving the effect of saving space and saving base costs. For the transformer 100, the current transformer 1 can also achieve the effect of improving the power density of the transformer.

[0068] [Second embodiment]

[0069] Next, Figure 5 , Figure 6 The second embodiment of the present invention is described, and the same components as the above are described using the same reference numerals. Figure 5 , Figure 51 is a perspective view of a current transformer 1' according to a second embodiment of the present invention. In this embodiment, the current transformer 1' comprises an iron core 10' and a current transformer coil 20. For the present invention, the iron core 10' only needs to be formed into a non-enclosed open shape and have at least a first contact surface 14' and a second contact surface 15'.

[0070] like Figure 5 As shown, in this embodiment, the open shape of the iron core 10' is substantially I-shaped. The iron core 10' has a top end 16 and a bottom end 17 in the extending direction (length direction) of the I-shape, the first contact surface 14' is located at the top end 16, and the second contact surface 15' is located at the bottom end 17. The first contact surface 14' and the second contact surface 15' are surfaces that contact the iron core 110 of the transformer 100 described later.

[0071] Furthermore, the core 10' further includes a middle portion 13', which is located approximately in the middle of the length of the I-shaped core 10', and the current transformer coil 20 is wound around the middle portion 13'. The winding of the current transformer coil 20 is not limited thereto, and the current transformer coil 20 may be wound around other places on the core 10' as long as it does not affect the first contact surface 14' and the second contact surface 15' from contacting the core 110.

[0072] Next, the configurations of the transformer 100 and the current output unit 40 are substantially the same as those of the first embodiment, and their description is omitted here.

[0073] Next, please refer to Figure 6 , Figure 6 FIG. 1 is a diagram illustrating the use of the current transformer 1' according to the second embodiment of the present invention. In this embodiment, although the shape of the groove 140 can be as Figure 6 The shape shown is not limited thereto, and any shape is acceptable as long as it can be engaged with the current transformer 1' and the transformer wire 130 can cause the current transformer coil 20 to generate an induced current. Furthermore, the groove 140 is not limited to being disposed in the middle portion 112, and can be disposed on any surface of the upper portion 111 or on any surface of the lower portion 113 as long as it can be engaged with the current transformer 1' and the transformer wire 130 can cause the current transformer coil 20 to generate an induced current.

[0074] like Figure 6 As shown, when the current transformer 1' is embedded in the groove 140, the first contact surface 14' of the top end 16 contacts the surface of the iron core 110 (middle portion 112), and the second contact surface 15' of the bottom end 17 contacts the surface of the iron core 110 (middle portion 112). When a current flows through the transformer wire 130 passing through the groove 140 (the current direction is inflow or outflow), a magnetic flux is generated.

[0075] This magnetic flux flows along the iron core 10', flows to the iron core 110 through the first contact surface 14', and then flows to the iron core 10' through the second contact surface 15', that is, along Figure 6 The magnetic flux path F shown in the figure forms a closed loop. At this time, due to the magnetic field induction, an induced current flows through the current transformer coil 20. In other words, when the induced current flows through the current transformer coil 20, it can be considered that there is a virtual magnetic field line M (such as the lower arrow in the magnetic flux path F) passing through the first contact surface 14'.

[0076] It should be particularly noted that there is no limitation on the size of the induced current output by the current transformer coil 20. For example, the number of turns of the current transformer coil 20 can be changed to make the size of the output induced current equal to the size of the transformer wire 130, or the size of the output induced current can be within the range within which the monitoring unit can operate.

[0077] Furthermore, the current source for generating magnetic flux is not limited to the transformer conductor 130 , and any current passing through the closed space (eg, the groove 140 ) surrounded by the iron core 10 ′ and the transformer 100 can be used as the current source for generating magnetic flux.

[0078] In this embodiment, since the current transformer 1' with an I-shaped iron core 10' replaces the current transformer with a ring-shaped iron core in the prior art, the current transformer 1' can be embedded in the iron core 110 of the transformer 100, so there is no need to reserve a base space in the transformer, and the space required for configuring the current transformer 1' is also reduced, thereby achieving the effect of saving space and saving base costs. For the transformer 100, the current transformer 1' can also achieve the effect of improving the power density of the transformer.

[0079] Compared with the current transformer 1 with the U-shaped core 10 of the first embodiment, the current transformer 1' of the second embodiment has the I-shaped core 10', which can further reduce the space required for configuring the current transformer 1', thereby further improving the power density of the transformer 100.

[0080] [Third embodiment]

[0081] Next, Figure 7 , Figure 8 The third embodiment of the present invention is described, and the same components as those previously described are described using the same reference numerals. Figure 7 , Figure 7 3D is a perspective view of a current transformer 1" according to a third embodiment of the present invention. In this embodiment, the current transformer 1" includes an iron core 10" and a current transformer coil 20. For the present invention, the iron core 10" only needs to be formed into a non-enclosed open shape and have at least a first contact surface 14" and a second contact surface 15".

[0082] like Figure 7 As shown, in this embodiment, the open shape of the iron core 10" is an arc, and the iron core 10" has a first end 18 as the starting point of the arc and a second end 19 as the end point of the arc, the first contact surface 14" is located at the first end 18, and the second contact surface 15" is located at the second end 19. The first contact surface 14" and the second contact surface 15" are surfaces that contact the iron core 110 of the transformer 100 described later.

[0083] The iron core 10" also includes a middle portion 13", which is located approximately in the middle of the arc length, and the current transformer coil 20 is wound around the middle portion 13". The winding of the current transformer coil 20 is not limited to this. As long as it does not affect the first contact surface 14" and the second contact surface 15" contacting the iron core 110, it can be wound around other places on the iron core 10". In addition, there is no limitation on the type of arc, for example, a semicircular type or a C-shaped type with a smaller opening is also acceptable.

[0084] In this embodiment, although the shape of the groove 140 can be Figure 8 The shape shown is not limited thereto, and any shape is acceptable as long as it can be embedded in the current transformer 1" and the transformer conductor 130 can cause the current transformer coil 20 to generate an induced current.

[0085] Next, please refer to Figure 8 , Figure 8 FIG. 1 is a diagram illustrating the use of a current transformer 1" according to a third embodiment of the present invention. Figure 8 As shown, when the current transformer 1" is engaged in the groove 140, the first contact surface 14" of the first end 18 contacts the surface of the iron core 110 (middle portion 112), and the second contact surface 15" of the second end 19 contacts the surface of the iron core 110 (middle portion 112). When current flows through the transformer wire 130 passing through the groove 140 (the current direction is inflow or outflow), magnetic flux is generated.

[0086] This magnetic flux flows along the iron core 10", flows to the iron core 110 through the first contact surface 14", and then flows to the iron core 10" through the second contact surface 15", that is, along Figure 8 The magnetic flux path F shown in the figure forms a closed loop. At this time, due to the magnetic field induction, an induced current flows through the current transformer coil 20. In other words, when the induced current flows through the current transformer coil 20, it can be considered that there is a virtual magnetic field line M (such as the arrow on the lower right side of the magnetic flux path F) passing through the first contact surface 14".

[0087] It should be particularly noted that there is no limitation on the size of the induced current output by the current transformer coil 20. For example, the number of turns of the current transformer coil 20 can be changed to make the size of the output induced current equal to the size of the transformer wire 130, or the size of the output induced current can be within the range within which the monitoring unit can operate.

[0088] Furthermore, the current source for generating magnetic flux is not limited to the transformer conductor 130 , and any current passing through the closed space (such as the groove 140 ) surrounded by the iron core 10 ″ and the transformer 100 can be used as the current source for generating magnetic flux.

[0089] In this embodiment, since the current transformer 1" with an arc-shaped core 10" replaces the current transformer with an annular core in the prior art, the current transformer 1" can be embedded in the core 110 fixed to the transformer 100, so there is no need to reserve a base space in the transformer, and the space required for configuring the current transformer 1" is also reduced, thereby achieving the effect of saving space and saving base costs. For the transformer 100, the current transformer 1" can also achieve the effect of improving the power density of the transformer.

[0090] Compared to the current transformer 1 with the U-shaped core 10 of the first embodiment, the current transformer 1'' of the third embodiment has the arc-shaped core 10'' which can further reduce the space required for configuring the current transformer 1'', thereby further improving the power density of the transformer 100.

[0091] [Fourth embodiment]

[0092] Next, Fig. 9 , Fig.10 The fourth embodiment of the present invention is described, and the same components as those previously described are described using the same reference numerals. Fig. 9 , Fig. 9 3D is a perspective view of a current transformer 1''' according to a fourth embodiment of the present invention. In this embodiment, the current transformer 1'' includes an iron core 10''' and a current transformer coil 20. For the present invention, the iron core 10'' only needs to be formed into a non-enclosed open shape and have at least a first contact surface 14''' and a second contact surface 15'''.

[0093] like Fig. 9As shown, in the present embodiment, the open shape of the core 10'' is an H shape, and the core 10'' further includes a first leg 11', a second leg 12' and a middle portion 13''. The first contact surface 14'' is located on the outward side surface of the first leg 11' (the surface on the opposite side to the second leg 12'), and the second contact surface 15'' is located on the outward side surface of the second leg 12' (the surface on the opposite side to the first leg 11'). The first contact surface 14'' and the second contact surface 15'' are surfaces in contact with the core 110 of the transformer 100 described later.

[0094] The core 10'' further includes a middle portion 13'', which is connected to the first leg 11' and the second leg 12' to form a substantially H-shape. The current transformer coil 20 is wound around the outer surface of the core 10'', that is, around the middle portion 13''.

[0095] In this embodiment, the middle portion 112 of the transformer 100 has a first member 201 and a second member 202. The first member 201 may be, for example, an I-core, and the second member 202 may be, for example, an E-core. The first member 201 and the second member 202 overlap to form the middle portion 112 and form a groove 140. Although the shape of the groove 140 may be as shown in FIG. Fig.10 The shape shown is not limited to this. As long as it can be embedded in the current transformer 1"' and the transformer wire can cause the current transformer coil 20 to generate an induced current, any shape is acceptable.

[0096] Next, please refer to Fig.10 , Fig.10 FIG. 1 is a diagram illustrating the use of a current transformer 1″′ according to a fourth embodiment of the present invention. Fig.10 As shown, when the current transformer 1'' is engaged in the groove 140 along the arrow direction, the first contact surface 14'' contacts the surface of the core 110 (middle portion 112), and the second contact surface 15'' contacts the surface of the core 110 (middle portion 112). The magnetic flux flow state of the fourth embodiment is roughly the same as that of the second embodiment in a top view. Figure 6 The same is not repeated here.

[0097] Furthermore, the current source for generating magnetic flux is not limited to the transformer conductor 130. Any current passing through the closed space (such as the groove 140) surrounded by the iron core 10"' and the transformer 100 can be used as the current source for generating magnetic flux.

[0098] In this embodiment, since the current transformer 1"' having an H-shaped iron core 10"' replaces the current transformer using a ring-shaped iron core in the prior art, the current transformer 1"' can be embedded and fixed in the iron core 110 of the transformer 100, so there is no need to reserve space for a base in the transformer, and the space required for configuring the current transformer 1"' is also reduced, thereby achieving the effect of saving space and saving base costs. For the transformer 100, the current transformer 1"' can also achieve the effect of improving the power density of the transformer.

[0099] Compared with the current transformer 1 of the first embodiment having the U-shaped core 10 , the current transformer 1 ″′ of the fourth embodiment has the H-shaped core 10 ″′. Since the first contact surface 14 ″′ and the second contact surface 15 ″′ have larger areas, they can be better fitted into the groove 140 .

[0100] [Other Modifications]

[0101] In the first to third embodiments, the first contact surfaces 14, 14', 14" and the second contact surfaces 15, 15', 15" are roughly parallel to the vertical direction, but are not limited to this. For example, the first contact surfaces 14, 14', 14" and the second contact surfaces 15, 15', 15" may be inclined relative to the vertical direction, or the first contact surfaces 14, 14', 14" and the second contact surfaces 15, 15', 15" may have different inclination angles relative to the vertical direction.

[0102] Furthermore, in the first to fourth embodiments, only one current transformer is disposed on the transformer, but this is not limited thereto. As long as a closed loop can be formed to allow the magnetic flux to flow, for example, multiple current transformers may be disposed on the same or different surfaces of the transformer.

[0103] Furthermore, in the first to fourth embodiments, the current transformer is disposed in the groove 140 of the transformer, but it is not limited thereto. As long as a closed loop can be formed to allow the magnetic flux to flow, the current transformer can be disposed on any surface of the transformer.

[0104] For example, see Fig.11 . Fig.11 The following are illustrations of the current transformer of the present invention being used in a transformer in different ways (transformer wires are omitted). Fig.11 As shown, in the transformer 100 without the groove 140 , the current transformer 10 can be placed flat on the upper surface of the transformer 100 . At this time, the first contact surface 14 and the second contact surface 15 are placed flat on the upper surface of the transformer 100 .

[0105] Since a closed loop can still be formed between the current transformer 10 and the upper surface of the transformer 100, the magnetic flux can still flow in the closed loop, so that the current transformer 10 can function. In this case, compared with the existing current transformer, the space saving and the base cost saving can still be achieved.

[0106] Furthermore, in the first to fourth embodiments, the current transformer is used in a transformer as an example for explanation, but the present invention is not limited thereto, and any device can be used as long as it can cause the current transformer to generate an induced current.

[0107] In summary, according to the current transformer of the present invention, since the current transformer can be embedded and fixed in the iron core of the transformer, it is not necessary to reserve space for the base in the transformer, and the space required for configuring the current transformer is also reduced, so that the effect of saving space and saving the base cost can be achieved. For the transformer, the power density of the transformer can also be improved through the current transformer. In addition, for devices other than the transformer that need to use the current transformer, the effect of saving space and saving the base cost can also be achieved.

[0108] Although the present invention is disclosed in the above embodiments, it is not intended to limit the present invention. A person skilled in the art of the present invention may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the following claims.

Claims

1. A current transformer, It is characterized in that include: An iron core formed into a non-enclosed open shape and having a first contact surface and a second contact surface; as well as a current transformer coil wound around the outer surface of the core; When an induced current flows through the current transformer coil, a virtual magnetic field line passes through the first contact surface or the second contact surface.

2. The current transformer according to claim 1, It is characterized in that The open shape of the iron core is U-shaped. The iron core also includes a first leg and a second leg. The first contact surface is located at the end of the first leg, and the second contact surface is located at the end of the second leg.

3. The current transformer according to claim 2, It is characterized in that The iron core also includes a middle portion connecting the first leg portion and the second leg portion, and the current transformer coil is wound around the middle portion.

4. The current transformer according to claim 1, It is characterized in that The open shape of the iron core is an I-shape. The iron core has a top end and a bottom end in the extending direction of the I-shape. The first contact surface is located at the top end, and the second contact surface is located at the bottom end.

5. The current transformer according to claim 4, It is characterized in that The iron core also includes a middle portion, which is located in the middle of the length of the I-shape, and the current transformer coil is wound around the middle portion.

6. The current transformer according to claim 1, It is characterized in that The open shape of the iron core is an arc shape. The iron core has a first end as a starting point of the arc shape and a second end as an end point of the arc shape. The first contact surface is located at the first end, and the second contact surface is located at the second end.

7. The current transformer according to claim 6, It is characterized in that The iron core also includes a middle portion, which is located in the middle of the arc length of the arc, and the current transformer coil is wound around the middle portion.

8. The current transformer according to claim 6, It is characterized in that The arc is a semicircle.

9. The current transformer according to claim 1, It is characterized in that The open shape of the core defines a through area adjacent to the current transformer coil.

10. The current transformer according to claim 1, It is characterized in that The current transformer also includes: A current output part outputs the induced current generated by the current transformer coil to the outside.

11. The current transformer according to claim 1, It is characterized in that The first contact surface and the second contact surface are laid flat.

Images