Multifunctional mutual inductor

Abstract

The utility model discloses a multifunctional mutual inductor which comprises a leakage current mutual inductance assembly used for detecting leakage current, a voltage mutual inductance assembly and a current mutual inductance assembly, the voltage mutual inductance assembly and the current mutual inductance assembly are used for detecting voltage and current, the leakage current mutual inductance assembly comprises a first sheath and a leakage current detection coil, and the voltage mutual inductance assembly comprises a second sheath and a voltage detection coil. The current mutual inductance assembly comprises a third sheath and a current detection coil, the voltage mutual inductance assembly and the current mutual inductance assembly are arranged up and down and jointly form a containing cavity, the leakage current mutual inductance assembly is arranged on the opening side of the containing cavity, and a conductive conductive needle is arranged between the leakage current mutual inductance assembly and the current mutual inductance assembly. The conductive needle is connected with the detection end of the voltage detection coil and penetrates through the first sheath and the third sheath, the leakage current can be detected, the voltage and the current of the main circuit can be detected at the same time, the use safety is guaranteed, meanwhile, the overall structure is compact and reasonable, and the occupied size is small.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, and particularly relates to a multifunctional transformer. Background Art

[0002] With the rapid development of electric vehicles, the demand for charging piles has increased rapidly. Generally, charging piles are installed in public building areas (such as charging stations, shopping malls, public parking lots, etc.). However, at present, the transformers used for charging piles lack the detection of residual current or leakage current. For example, they cannot detect and protect smooth direct current above 6 mA, resulting in certain potential safety risks during the daily use of charging piles.

[0003] In addition, the functions of existing transformers are single. For example, they can only detect leakage current, or can only detect the voltage and current of the main circuit. If three transformers with different functions need to be installed in the charging pile, the occupied volume will be relatively large, which is not convenient for installation. Content of the Utility Model

[0004] Therefore, to solve the above problems, the utility model provides a multifunctional transformer, which can not only detect leakage current, but also detect the voltage and current of the main circuit to ensure the use safety. At the same time, the overall structure is compact and reasonable, and the occupied volume is small.

[0005] To achieve the above object, the technical solution provided by the utility model is as follows:

[0006] The utility model provides a multifunctional transformer, which includes a leakage current mutual inductance component for detecting leakage current, a voltage mutual inductance component for detecting voltage, and a current mutual inductance component for detecting current; the leakage current mutual inductance component includes an insulating first sheath and a leakage current detection coil assembled in the first sheath; the voltage mutual inductance component includes an insulating second sheath and a voltage detection coil assembled in the second sheath; the current mutual inductance component includes an insulating third sheath and a current detection coil assembled in the third sheath; the voltage mutual inductance component and the current mutual inductance component are arranged up and down, and jointly form a receiving cavity located between the voltage mutual inductance component and the current mutual inductance component; the leakage current mutual inductance component is arranged on the opening side of the receiving cavity; a conductive needle for externally connecting a detection circuit and conducting electricity is arranged between the leakage current mutual inductance component and the current mutual inductance component, and the conductive needle is connected to the detection end of the voltage detection coil and penetrates through the first sheath and the third sheath.

[0007] Furthermore, an insulating first skeleton is arranged between the leakage current mutual inductance component and the current mutual inductance component, and the first skeleton has a protruding portion extending toward the accommodating cavity, and the protruding portion passes through the first sheath and is inserted into the accommodating cavity; the outer peripheral surface of the protruding portion has an installation groove for fitting the conductive needle for fixing, and the installation grooves are arranged at intervals from each other so that the conductive needles confined in the installation grooves are insulated from each other.

[0008] Furthermore, a second frame is provided between the second sheath and the third sheath, the second sheath is fixed to one side of the second frame, and the other side is fixed to the third sheath; and an accommodating cavity opening toward the current mutual inductance component is provided in the second frame.

[0009] Furthermore, the number of the voltage mutual inductance components and the current mutual inductance components is 3 each, and the number of the conductive needles is 4; the second sheaths of the three voltage mutual inductance components are all fixed on the second skeleton; the third sheaths of two current mutual inductance components are fixed to a circuit board, and the third sheath of the third current mutual inductance component is arranged on one side of the long direction of the second skeleton; the lead ends of the four conductive needles are passed through the circuit board.

[0010] Furthermore, the conductive needle, the leakage current mutual inductance component, the voltage mutual inductance component, the current mutual inductance component, the first skeleton, the second skeleton and the circuit board are all assembled in a shell, and the lead end of the conductive needle passes through the circuit board and the shell in sequence.

[0011] Furthermore, the shell includes a bottom shell and an upper cover, and the upper cover is covered on the bottom shell.

[0012] Furthermore, both lead ends of the conductive needle extend toward one side of the voltage mutual inductance component or the current mutual inductance component.

[0013] Furthermore, the conductive needle has two vertical portions arranged at intervals and a connecting portion connected between the two vertical portions, and the connecting portion is arranged at an angle to the two vertical portions respectively; the end of the vertical portion away from the connecting portion is the lead-out end of the conductive needle.

[0014] Furthermore, the conductive needle is a U-shaped needle.

[0015] The technical solution provided by the utility model has the following beneficial effects:

[0016] By arranging the voltage mutual inductance component and the current mutual inductance component vertically, arranging the leakage current mutual inductance component on the opening side of the accommodation cavity located between the voltage mutual inductance component and the current mutual inductance component, and providing an insulating sheath corresponding to each detection coil for insulation protection, a compact and reasonable layout structure is formed, achieving a small overall occupied volume, easy installation, separating high and low voltages from each other, further realizing the safe and stable operation and use of the mutual inductor, being able to detect leakage current, and simultaneously taking into account the detection of the voltage and current of the main circuit. Description of the Drawings

[0017] Figure 1 Shown is the first perspective structure diagram of the multifunctional mutual inductor without an upper cover in the embodiment;

[0018] Figure 2 Shown is the second perspective structure diagram of the multifunctional mutual inductor without an upper cover in the embodiment;

[0019] Figure 3 Shown is the cross-sectional view of the multifunctional mutual inductor equipped with an upper cover in the embodiment;

[0020] Figure 4 Shown is the schematic diagram of the first skeleton in the embodiment;

[0021] Figure 5 Shown is the schematic diagram of the second skeleton in the embodiment;

[0022] Figure 6 Shown is the schematic diagram of the first sheath in the embodiment;

[0023] Figure 7 Shown is the external view of the first sheath from another perspective in the embodiment;

[0024] Figure 8 Shown is the schematic diagram of the second sheath in the embodiment;

[0025] Figure 9 Shown is the schematic diagram of the third sheath in the embodiment;

[0026] Figure 10 Shown is the schematic diagram of the conductive pin in the embodiment;

[0027] Figure 11 Shown is the detection circuit diagram of the multifunctional mutual inductor in the embodiment. Detailed Embodiment

[0028] To further illustrate each embodiment, the present utility model provides accompanying drawings. These drawings are a part of the disclosure of the present utility model, mainly used to illustrate the embodiments, and can cooperate with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0029] The present utility model will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0030] Referring to Figures 1 to 5 as shown, this embodiment provides a multifunctional mutual inductor (hereinafter simply referred to as mutual inductor) for detecting the leakage current of a charging pile and the voltage and current of a charging circuit. The mutual inductor includes a leakage current mutual inductance component 1 for detecting leakage current, a voltage mutual inductance component 2 for detecting voltage, and a current mutual inductance component 3 for detecting current as shown in Figure 1 . The leakage current mutual inductance component 1 includes an insulating first sheath 11 as shown in Figure 6 and Figure 7 , and a leakage current detection coil assembled inside the first sheath 11. The voltage mutual inductance component 2 includes an insulating second sheath 21 as shown in Figure 8 , and a voltage detection coil assembled inside the second sheath 21. The current mutual inductance component 3 includes an insulating third sheath 31 as shown in Figure 9 , and a current detection coil assembled inside the third sheath 31, so as to realize the partification of each mutual inductance component such as the leakage current mutual inductance component 1, the current mutual inductance component 3, and the leakage current mutual inductance component 1, thereby ensuring that its production process is more convenient.

[0031] The voltage mutual inductance component 2 and the current mutual inductance component 3 are arranged up and down, and jointly form a receiving cavity 61 located between the voltage mutual inductance component 2 and the current mutual inductance component 3. The leakage current mutual inductance component 1 is arranged on the opening side 611 of the receiving cavity 61. A conductive needle 4 for externally connecting a detection circuit and conducting electricity is arranged between the leakage current mutual inductance component 1 and the current mutual inductance component 3. Specifically, the conductive needle 4 is a U-shaped needle. The conductive needle 4 connects the detection end of the voltage detection coil, passes through the first sheath 11 and the third sheath 31, and forms a detection circuit diagram of the mutual inductor as shown in Figure 11 .

[0032] In this embodiment, an insulating component as shown in Figure 4The first framework 5 shown has a protruding portion 51 that protrudes and extends toward the accommodation cavity 61. The protruding portion 51 passes through the first sheath 11 and is inserted into the accommodation cavity 61. The outer peripheral surface of the protruding portion 51 has four mounting grooves 511 for fixing the conductive pins 4. The four mounting grooves 511 are spaced from each other to insulate the four conductive pins 4 in the corresponding mounting grooves 511 from each other, so as to achieve insulation between the respective conductive pins 4.

[0033] Between the second sheath 21 and the third sheath 31, there is provided as Figure 5 the second framework 6 shown. The second sheath 21 is fixed to the upper side of the second framework 6, and the lower side is fixed to the third sheath 31. An accommodation cavity 61 that opens toward the current mutual inductance assembly 3 is provided inside the second framework 6.

[0034] More specifically, the number of voltage mutual inductance assemblies 2 and current mutual inductance assemblies 3 provided is 3 each, and the number of conductive pins 4 provided is 4. Among them, 3 conductive pins 4 correspond to the three-phase power A, B, and C, and the fourth conductive pin 4 corresponds to the neutral line N. The three-phase power A, B, and C and the neutral line N cooperate to form 3 detection circuits or main circuits. The 3 voltage mutual inductance assemblies 2 correspond to the 3 detection circuits one by one, and the 3 current mutual inductance assemblies 3 also correspond to the 3 detection circuits one by one. At the same time, a leakage current mutual inductance assembly 1 is provided to detect the leakage current of the charging pile.

[0035] In addition, the second sheaths 21 of the 3 voltage mutual inductance assemblies 2 are all fixed to the second framework 6. The third sheaths 31 of two of the current mutual inductance assemblies 3 are fixed to a circuit board 8, and the third sheath 31 of the third current mutual inductance assembly 3 is arranged on the right side of the second framework 6 in the longitudinal direction. The lead-out ends of the 4 conductive pins 4 pass through the circuit board 8.

[0036] By arranging the voltage mutual inductance assembly 2 and the current mutual inductance assembly 3 vertically, arranging the leakage current mutual inductance assembly 1 on the opening side 611 of the accommodation cavity 61 located between the voltage mutual inductance assembly 2 and the current mutual inductance assembly 3, and providing each detection coil with a corresponding sheath for insulation protection, a compact and reasonable layout structure is formed, so as to achieve a small overall occupied volume and easy installation. The high and low voltages are also separated from each other, thereby realizing the safe and stable operation and use of the mutual inductor, being able to detect the leakage current, and at the same time taking into account the detection of the voltage and current of the main circuit.

[0037] In another preferred embodiment, as Figure 1 、 Figure 2 and Figure 3 shown, both lead-out ends of the 4 conductive pins 4 extend toward the lower side of the voltage mutual inductance assembly 2. Of course, all the lead-out ends can also extend toward the side of the current mutual inductance assembly 3. With such an arrangement, the lead-out ends of the conductive pins 4 of the mutual inductor can be concentrated on the same side, so as to ensure more convenience for the user when using the mutual inductor.

[0038] More specifically, as Figure 10 shown, the conductive needle 4 has two vertically arranged portions 41 with a set spacing and a connecting portion 42 connected between the two vertically arranged portions 41. The included angles between the connecting portion 42 and the two vertically arranged portions 41 are both 90 degrees, or can be angles between 0 and 90 degrees. The end of the vertically arranged portion 41 facing away from the connecting portion 42 is the lead-out end of the conductive needle 4, and the connecting portion 42 is U-shaped to facilitate the conductive needle 4 to pass through the central holes of the first skeleton 5, the second skeleton 6, the first sheath 11, and the third sheath 31, and can further ensure a relatively small overall volume.

[0039] In this specific embodiment, 4 conductive needles 4, 1 leakage current mutual inductance component 1, 3 voltage mutual inductance components 2, 3 current mutual inductance components 3, 1 first skeleton 5, 1 second skeleton 6, and 1 circuit board 8 are all assembled in a housing 7, and the lead-out ends of all the conductive needles 4 pass through the circuit board 8 and the housing 7 in sequence. Specifically, the housing 7 includes a bottom case 71 and an upper cover 72, and the upper cover 72 covers the bottom case 71.

[0040] The mutual inductor further includes a terminal block 9, which is arranged at the leftmost side to facilitate external connection of the circuit.

[0041] When the mutual inductor of this embodiment needs to be installed, first wind the 3 types of coils and assemble them in the corresponding sheaths. That is, the leakage current detection coil uses a coil of model HP25.7×22.6×3.2N and is assembled in the first sheath 11, the voltage detection coil uses a coil of model HP1303N and is assembled in the second sheath 21, and the current detection coil uses a coil of model HP17×10.5×5.2S and is assembled in the third sheath 31, and then they are fixed together with potting glue respectively.

[0042] Then, weld the second sheaths 21 of the two current mutual inductance components 3 to the circuit board 8, and pass the 4 conductive needles 4 through the central holes of the first sheath 11 and fix them through the first skeleton 5. In addition, two of the conductive needles 4 connecting the A and B phase circuits pass through the central holes of the second sheaths 21 of the two current mutual inductance components 3 welded to the circuit board 8 one by one, and pass the second sheath 21 of the third current mutual inductance component 3 located on the right side of the second skeleton 6 through the third conductive needle 4 connecting the C phase circuit, and the fourth conductive needle 4 connecting the neutral line N directly passes through the circuit board 8 and does not need to pass through the central holes of the second sheath 21 and the third sheath 31 anymore.

[0043] After the lead-out ends of all the conductive needles 4 pass through the circuit board 8, fix all the conductive needles 4 on the circuit board 8 by welding.

[0044] Then, install three voltage mutual inductance components 2 on the top of the second skeleton 6. Then, place the second skeleton 6 with the voltage mutual inductance components 2 installed on the top of the two second sheaths 21 that have been welded to the circuit board 8. After that, also weld the terminal block 9 with three Pin pins on the left side of the circuit board 8. Then, install the circuit board 8 on the bottom case 71. Finally, cover the upper cover 72 to complete the installation of the entire mutual inductor.

[0045] Although the present utility model is specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present utility model in terms of form and details without departing from the spirit and scope of the present utility model defined by the appended claims, and all such changes are within the protection scope of the present utility model.

Claims

1. A multifunctional mutual inductor, characterized in that: It includes a leakage current mutual inductance component for detecting leakage current, a voltage mutual inductance component for detecting voltage, and a current mutual inductance component for detecting current; The leakage current mutual inductance component comprises an insulating first sheath and a leakage current detection coil mounted in the first sheath; the voltage mutual inductance component comprises an insulating second sheath and a voltage detection coil mounted in the second sheath; the current mutual inductance component comprises an insulating third sheath and a current detection coil mounted in the third sheath; The voltage mutual inductance component and the current mutual inductance component are arranged in an upper and lower position, and together form a receiving cavity located between the voltage mutual inductance component and the current mutual inductance component; the leakage current mutual inductance component is arranged on the opening side of the receiving cavity; A conductive needle for externally connecting a detection circuit and conducting electricity is provided between the leakage current mutual inductance component and the current mutual inductance component. The conductive needle is connected to the detection end of the voltage detection coil and is passed through the first sheath and the third sheath.

2. The multifunctional transformer according to claim 1, characterized in that: An insulating first skeleton is arranged between the leakage current mutual inductance component and the current mutual inductance component, and the first skeleton has a protruding portion extending toward the accommodating cavity, and the protruding portion passes through the first sheath and is inserted into the accommodating cavity; the outer peripheral surface of the protruding portion has an installation groove for fitting with the conductive needle for fixing, and the installation grooves are arranged at intervals from each other so that the conductive needles confined in the installation grooves are insulated from each other.

3. The multifunctional transformer according to claim 2, characterized in that: A second frame is arranged between the second sheath and the third sheath, the second sheath is fixed to one side of the second frame, and the other side is fixed to the third sheath; an accommodating cavity opening toward the current mutual inductance component is arranged in the second frame.

4. The multifunctional transformer according to claim 3, characterized in that: The number of the voltage mutual inductance components and the current mutual inductance components is 3 each, and the number of the conductive needles is 4; the second sheaths of the three voltage mutual inductance components are all fixed on the second skeleton; the third sheaths of two current mutual inductance components are fixed on a circuit board, and the third sheath of the third current mutual inductance component is arranged on one side of the long direction of the second skeleton; the lead ends of the four conductive needles are passed through the circuit board.

5. The multifunctional transformer according to claim 4, characterized in that: The conductive needle, the leakage current mutual inductance component, the voltage mutual inductance component, the current mutual inductance component, the first frame, the second frame and the circuit board are all assembled in a shell, and the lead end of the conductive needle passes through the circuit board and the shell in sequence.

6. The multifunctional transformer according to claim 5, characterized in that: The shell comprises a bottom shell and an upper cover, and the upper cover is covered on the bottom shell.

7. The multifunctional transformer according to any one of claims 1 to 6, characterized in that: Both lead ends of the conductive needle extend toward one side of the voltage mutual inductance component or the current mutual inductance component.

8. The multifunctional transformer according to claim 7, characterized in that: The conductive needle has two vertical parts arranged at intervals and a connecting part connected between the two vertical parts, and the connecting part is arranged at an angle with the two vertical parts respectively; the end of the vertical part away from the connecting part is the lead-out end of the conductive needle.

9. The multifunctional transformer according to claim 7, characterized in that: The conductive needle is a U-shaped needle.

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