Two-way output type voltage transformer

Abstract

The utility model relates to the technical field of power electronic equipment, in particular to a double-path output type voltage transformer. The voltage transformer comprises a core piece, a shell and a packaging material. A primary winding, a first secondary winding and a second secondary winding of the core piece are sequentially wound on an annular magnetic core from inside to outside, and a shielding layer is arranged between the primary winding and the first secondary winding. Insulating layers are arranged between the annular magnetic core and the primary winding, between the shielding layer and the primary winding and the first secondary winding and between the first secondary winding and the second secondary winding, and the wire ends of the primary winding, the shielding layer, the first secondary winding and the second secondary winding are connected with the pins. The core piece is packaged in the shell, and one end of each pin extends out of the outer side of the packaging material after packaging. Primary side voltage input and secondary side two-group output are achieved through voltage detection of the voltage transformer, the anti-interference capacity of the transformer is improved through the shielding layer, the overall structure is compact, and installation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronic equipment, in particular to a dual-output voltage transformer. Background Art

[0002] Currently, the measurement method for relay voltage transformers is relatively simple. Typically, a high voltage is input, converted to a low voltage output by the transformer, and then a detection device connected to the secondary side verifies the voltage accuracy, thereby monitoring the high voltage on the primary side. If the secondary-side voltage detection device is damaged, the primary-side voltage cannot be monitored in a timely manner, potentially affecting other primary circuits and burning out other components. Therefore, the existing solution of primary-side voltage input and secondary-side output is sometimes unable to meet requirements. Utility Model Content

[0003] The purpose of the utility model is to provide a dual-output voltage transformer to achieve dual-output on the secondary side.

[0004] In order to achieve the above object, the utility model provides a dual-output voltage transformer, comprising:

[0005] A core component, comprising a toroidal magnetic core, a primary winding, a shielding layer, a first secondary winding, and a second secondary winding, wherein the primary winding, the first secondary winding, and the second secondary winding are wound on the toroidal magnetic core in sequence from the inside to the outside, the shielding layer is located between the primary winding and the first secondary winding, a first insulating layer is provided between the toroidal magnetic core and the primary winding, a second insulating layer is provided between the primary winding and the shielding layer, a third insulating layer is provided between the shielding layer and the first secondary winding, and a fourth insulating layer is provided between the first secondary winding and the second secondary winding, and the wire ends of the primary winding, the shielding layer, the first secondary winding, and the second secondary winding are connected to the pins;

[0006] a housing for accommodating the core;

[0007] The packaging material is used to cast and encapsulate the shell after the core is installed in the shell. After encapsulation, one end of the pin extends out of the outside of the packaging material.

[0008] Optionally, the annular magnetic core is an ultra-microcrystalline ring.

[0009] Optionally, the first insulating layer is an insulating coating sprayed on the annular magnetic core.

[0010] Optionally, the primary winding, the first secondary winding and the second secondary winding are all wound with enameled wire.

[0011] Optionally, the shielding layer is copper foil.

[0012] Optionally, the second insulating layer, the third insulating layer and the fourth insulating layer are all polyester films.

[0013] Optionally, the encapsulation material is epoxy resin.

[0014] Optionally, the dual-output voltage transformer also includes a positioning frame plate. When the positioning frame plate is installed in the shell, the outer periphery is against the inner wall of the shell. Multiple pins are fixed on the positioning frame plate and are asymmetrically distributed. Each pin passes through the positioning frame plate, and the two ends are located on both sides of the positioning frame plate.

[0015] Optionally, a groove is provided on the side of the positioning frame plate that contacts the inner wall of the shell, and a boss matching the groove is provided on the inner wall of the shell.

[0016] Optionally, a plurality of reinforcing ribs are provided at intervals on the inner wall of the shell, and when the positioning frame is installed in the shell, the lower side of the positioning frame abuts against the upper ends of the reinforcing ribs.

[0017] The above technical solution of the utility model has the following advantages:

[0018] The dual-output voltage transformer provided by the utility model includes a core, a shell and a packaging material. The core is placed in the shell. After the core is installed in the shell, the packaging material is used to cast and seal the shell. The core includes a toroidal magnetic core, a primary winding, a shielding layer, a first secondary winding and a second secondary winding. The primary winding, the first secondary winding and the second secondary winding are wound on the toroidal magnetic core from the inside to the outside in sequence. The shielding layer is located between the primary winding and the first secondary winding. A first insulating layer is provided between the toroidal magnetic core and the primary winding. A second insulating layer is provided between the primary winding and the shielding layer. A third insulating layer is provided between the shielding layer and the first secondary winding. A fourth insulating layer is provided between the first secondary winding and the second secondary winding. The wire ends of the primary winding, the shielding layer, the first secondary winding and the second secondary winding are connected to the pins. After the core is installed in the shell, the packaging material is used to cast and seal the shell. After the sealing, one end of the pin extends out of the outside of the packaging material. This voltage transformer's voltage detection implements primary-side voltage input and two sets of secondary-side outputs, with shielding between them. This effectively blocks static electricity generated during the transformer's operation and prevents external high-frequency interference signals from entering the device, thereby improving the transformer's anti-interference capabilities. The overall structure is compact and easy to install. When used in three-phase circuits, it can simultaneously output line voltage and phase voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings of the present invention are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not necessarily be consistent with the actual product.

[0020] Figure 1 This is a structural diagram of a dual-output voltage transformer in an embodiment of the present utility model;

[0021] Figure 2This is a schematic structural diagram of a dual-output voltage transformer in an embodiment of the present utility model when it is not potted;

[0022] Figure 3 This is a schematic structural diagram of a core member in an embodiment of the present utility model;

[0023] Figure 4 This is a structural diagram of a housing in an embodiment of the present utility model;

[0024] Figure 5 This is a structural diagram of a ring-shaped magnetic core in an embodiment of the present utility model;

[0025] Figure 6 This is a structural diagram of a primary winding and a shielding layer of a core member in an embodiment of the present invention (the second insulating layer is not shown);

[0026] Figure 7 This is a schematic structural diagram of a first secondary winding of a core member in an embodiment of the present utility model;

[0027] Figure 8 It is a structural schematic diagram of the second secondary winding of a core member in an embodiment of the present utility model.

[0028] In the picture:

[0029] 1: core;

[0030] 11: Ring core;

[0031] 12: primary winding;

[0032] 13: shielding layer;

[0033] 14: first secondary winding;

[0034] 15: second secondary winding;

[0035] 16: pin;

[0036] 17: Positioning frame;

[0037] 171: groove;

[0038] 2: Shell;

[0039] 21: boss;

[0040] 22: reinforcement;

[0041] 3: Packaging material. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0043] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0044] Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0045] like Figures 1 to 3 As shown, the dual-output voltage transformer provided by the embodiment of the present invention includes a core 1, a shell 2 and a packaging material 3. The core 1 is placed in the shell 2. After the core 1 is installed in the shell 2, the packaging material 3 is used to cast and seal the shell 2.

[0046] See also Figure 3 、 Figures 5 to 8 As shown, the core 1 includes a toroidal core 11, a primary winding 12, a shielding layer 13, a first secondary winding 14, and a second secondary winding 15. The primary winding 12, the first secondary winding 14, and the second secondary winding 15 are sequentially wound around the toroidal core 11 from the inside to the outside (along the radial direction of the toroidal core 11). Winding the coils on the outside of the toroidal core 11 is efficient and facilitates mass production. The shielding layer 13 is located between the primary winding 12 and the first secondary winding 14. A first insulating layer (not shown) is provided between the toroidal core 11 and the primary winding 12. A second insulating layer (not shown) is provided between the primary winding 12 and the shielding layer 13. A third insulating layer (not shown) is provided between the shielding layer 13 and the first secondary winding 14. A fourth insulating layer (not shown) is provided between the first secondary winding 14 and the second secondary winding 15. The wire ends of the primary winding 12, the shielding layer 13, the first secondary winding 14, and the second secondary winding 15 are connected to the pin 16.

[0047] In one example, the primary winding 12 , the first secondary winding 14 , and the second secondary winding 15 each have two wire ends, each of which is connected to a pin 16 . The shielding layer 13 has one wire end, which is connected to a pin 16 .

[0048] The housing 2 is used to accommodate the core 1. After the core 1 is installed in the housing 2, the encapsulation material 3 is used to cast and encapsulate the housing 2. After encapsulation, one end of the pin 16 extends out of the outside of the encapsulation material 3.

[0049] The dual-output voltage transformer provided in this embodiment features voltage detection using a primary voltage input and two secondary outputs, shielded between them. This effectively blocks static electricity generated during operation and prevents high-frequency interference signals from entering the transformer, thereby improving the transformer's anti-interference capabilities. The overall structure is compact and easy to install. When used in a three-phase circuit, it can simultaneously output both line and phase voltages, making this embodiment particularly suitable for use in three-phase relay protection systems.

[0050] The annular magnetic core 11 can adopt an existing magnetic core, such as a Permalloy core. In one example of the present embodiment, the annular magnetic core 11 adopts an ultra-fine crystal annular magnetic core, which has low loss, high precision, and low price. It is a commonly used material in the industry and is easy to purchase. Preferably, the primary winding 12, the first secondary winding 14, and the second secondary winding 15 are all wound by enameled wire. The first insulating layer is an insulating coating sprayed on the annular magnetic core 11. For example, the annular magnetic core 11 adopts an ultra-fine crystal sprayed annular magnetic core. The first insulating layer plays an insulating role for protecting the internal magnetic material and preventing the enameled wire from contacting it. The insulating coating can adopt existing technology and will not be described here.

[0051] In one example of this embodiment, the shielding layer 13 is made of copper foil. The copper foil can be placed on the outside of the primary winding 12, and its lead wire is grounded in the circuit. This can effectively block the static electricity generated during the operation of the transformer and prevent external high-frequency interference signals from entering the machine, thereby improving the anti-interference ability of the transformer.

[0052] In an example of this embodiment, the second insulating layer, the third insulating layer and the fourth insulating layer are all polyester films.

[0053] In this embodiment, the encapsulation material can be a commonly used encapsulation material. In one example, the encapsulation material is epoxy resin.

[0054] To facilitate assembly, in one example, see Figure 2 and Figure 3As shown, the dual-output voltage transformer also includes a positioning frame 17. When installed in the housing 2, the outer periphery of the positioning frame 17 abuts the inner wall of the housing 2. Multiple pins 16 are fixed to the positioning frame 17 in an asymmetrical distribution, providing a foolproof function. Each pin 16 passes through the positioning frame 17, with two ends of the pin 16 located on either side of the positioning frame 17. One end is used for welding to the wire ends of the primary winding 12, the shield layer 13, the first secondary winding 14, and the second secondary winding 15, while the other end extends out for connection to other devices.

[0055] To improve assembly reliability, in one example, see Figure 3 and Figure 4 As shown, a groove 171 is provided on one side of the positioning frame plate 17 that contacts the inner wall of the housing 2, and a boss 21 that matches the groove 171 is provided on the inner wall of the housing 2. When assembled, a portion of the boss 21 is located in the groove 171.

[0056] In order to further improve the convenience and reliability of assembly, in one example, see Figure 4 The inner wall of the shell 2 is provided with a plurality of reinforcing ribs 22 at intervals. When the positioning frame plate 17 is installed in the shell 2, the lower side of the positioning frame plate 17 abuts against the upper end of the reinforcing ribs 22, which makes the installation quick, provides support for the positioning frame plate 17, and has good reliability.

[0057] In one specific example, the toroidal core uses an ultra-fine-grained spray-coated ring with a net outer diameter of 33 mm, an inner diameter of 15 mm, and a height of 17 mm. The primary winding uses 1000 turns of Φ0.1 mm enameled wire, while the first and second secondary windings use Φ0.1 mm enameled wire with 707 and 353 turns, respectively. The shield layer uses 15*120*0.05 mm copper foil. The performance parameters of the dual-output voltage transformer in this example are shown in Table 1:

[0058] Table 1

[0059]

[0060] In the table, pins 1 and 2 refer to the two pins connected to the primary winding wire ends, pins 4 and 5 refer to the two pins connected to the first secondary winding wire ends, and pins 6 and 7 refer to the two pins connected to the second secondary winding wire ends.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution. In the absence of a conflict of solutions, the various technical features mentioned in each embodiment can be combined in any manner to form other implementation methods that can be understood by those skilled in the art.

[0062] In addition, without departing from the scope of the present invention, the technical solutions described in the aforementioned embodiments may be modified, or some of the technical features thereof may be replaced by equivalents, without causing the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-output voltage transformer, characterized in that: include: A core member, comprising a toroidal magnetic core, a primary winding, a shielding layer, a first secondary winding, and a second secondary winding, wherein the primary winding, the first secondary winding, and the second secondary winding are wound sequentially on the toroidal magnetic core from the inside to the outside, the shielding layer is located between the primary winding and the first secondary winding, a first insulating layer is provided between the toroidal magnetic core and the primary winding, a second insulating layer is provided between the primary winding and the shielding layer, a third insulating layer is provided between the shielding layer and the first secondary winding, and a fourth insulating layer is provided between the first secondary winding and the second secondary winding, and the wire ends of the primary winding, the shielding layer, the first secondary winding, and the second secondary winding are connected to the pins; a housing for accommodating the core; The packaging material is used to cast and encapsulate the shell after the core is installed in the shell. After encapsulation, one end of the pin extends out of the outside of the packaging material.

2. The dual-output voltage transformer according to claim 1, characterized in that: The annular magnetic core is an ultra-microcrystalline ring.

3. The dual-output voltage transformer according to claim 1, characterized in that: The first insulating layer is an insulating coating sprayed on the annular magnetic core.

4. The dual-output voltage transformer according to claim 1, characterized in that: The primary winding, the first secondary winding and the second secondary winding are all wound with enameled wire.

5. The dual-output voltage transformer according to claim 1, characterized in that: The shielding layer is copper foil.

6. The dual-output voltage transformer according to claim 1, characterized in that: The second insulating layer, the third insulating layer and the fourth insulating layer are all polyester films.

7. The dual-output voltage transformer according to claim 1, characterized in that: The packaging material is epoxy resin.

8. The dual-output voltage transformer according to claim 1, characterized in that: It also includes a positioning frame plate. When the positioning frame plate is installed in the shell, the outer periphery is against the inner wall of the shell. Multiple pins are fixed on the positioning frame plate and are asymmetrically distributed. Each pin passes through the positioning frame plate, and the two ends are respectively located on both sides of the positioning frame plate.

9. The dual-output voltage transformer according to claim 8, characterized in that: A groove is provided on one side of the positioning frame plate that contacts the inner wall of the shell, and a boss matching the groove is provided on the inner wall of the shell.

10. The dual-output voltage transformer according to claim 8, characterized in that: The inner wall of the shell is provided with a plurality of reinforcing ribs at intervals. When the positioning frame plate is installed in the shell, the lower side of the positioning frame plate abuts against the upper ends of the reinforcing ribs.

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