CN212752123U

CN212752123U - Filter circuit for transformer and transformer

Info

Publication number: CN212752123U
Application number: CN202021570196.5U
Authority: CN
Inventors: 王小琼
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-03-19
Anticipated expiration: 2030-07-31

Abstract

The embodiment of the utility model provides a filter circuit and transformer for transformer. Wherein the filter circuit is provided on a line between a power supply and a load, and includes: the input side of the rectification module is connected with the power supply and is used for rectifying a power supply output signal of the power supply; and the first filtering module is arranged between the output side of the rectifying module and the load and used for filtering the signal rectified by the rectifying module and outputting the signal subjected to filtering to the load. The embodiment of the utility model provides a be provided with the filtering link behind the rectification link of transformer to the harmonic interference that the rectification link produced can be eliminated completely.

Description

Filter circuit for transformer and transformer

Technical Field

The utility model relates to a transformer technical field specifically relates to a filter circuit and transformer for transformer.

Background

Servo transformer refers to a transformer matched to a servo driver for converting an industrial voltage to a voltage matched to the servo driver. At present, servo transformers are divided into traditional dry servo transformers and intelligent servo transformers. The traditional dry-type servo transformer is made of raw materials such as an iron core, a copper wire and an aluminum wire, and is gradually eliminated by the market due to the defects of heaviness, heat generation, inconvenience in transportation, high cost and the like. The intelligent servo transformer has come into operation, the intelligent rectifier module is adopted to overcome the defects of the traditional dry-type transformer, but a large amount of harmonic waves can be generated at a rectifier loop section, so that the anti-interference performance is slightly poor, and the popularization and the application are influenced.

Specifically, the industrial electricity is rectified by a rectifying module of the intelligent servo transformer, and alternating current is converted into direct current electric energy to be supplied to a servo system or a frequency conversion system or a stepping system for use. However, in the rectification link, the rectification module injects harmonic waves into the input-side power grid, so that interference is generated on other electrical equipment in the output-side power grid. And electrical equipment such as a servo system, a frequency conversion system, a stepping system, a board card, a PLC, a numerical control system and the like in the automation equipment have very high requirements on the purity of a power grid, and a large amount of harmonic waves can prevent the electrical equipment from stably and normally operating.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a filter circuit and transformer for solve current intelligent servo transformer and have harmonic interference's problem in the rectification link.

In order to achieve the above object, an embodiment of the present invention provides a filter circuit for a transformer, the filter circuit is disposed on a line between a power supply and a load, and includes: the input side of the rectification module is connected with the power supply and is used for rectifying a power supply output signal of the power supply; and the first filtering module is arranged between the output side of the rectifying module and the load and used for filtering the signal rectified by the rectifying module and outputting the signal subjected to filtering to the load.

Optionally, the filter circuit for a transformer further includes: and the second filtering module is arranged between the power supply and the input side of the rectifying module and is used for carrying out primary filtering on the power supply output signal and transmitting the signal subjected to the primary filtering to the rectifying module.

Optionally, the second filtering module is comprised of one or more of a common mode coil, a magnetic loop, and a filtering element.

Optionally, when the power supply is a three-phase ac power supply, and the filtering module is a common-mode coil module including a plurality of common-mode coils: each phase of each of the three-phase ac power supply is connected to at least one of the plurality of common mode coils, or all three-phase four wires of the three-phase ac power supply are connected to at least one of the plurality of common mode coils.

Optionally, the first filtering module is any one of a filtering element, a magnetic loop and an RC circuit.

Optionally, the first filtering module is a circuit formed by connecting any two or three of a filtering element, a magnetic ring and an RC circuit in series.

Optionally, the first filtering module includes at least two stages of filtering units connected in series, wherein each stage of filtering unit is configured to enable harmonic filtering.

Optionally, the each stage of filtering unit is configured as any one of a filtering element, a magnetic loop and an RC circuit.

Optionally, the filtering units of each stage are configured as a circuit formed by any two or more of a filtering element, a magnetic loop and an RC circuit connected in series.

On the other hand, the embodiment of the utility model provides a still provide a transformer, this transformer includes foretell filter circuit.

Through the technical scheme, the utility model discloses a beneficial effect that is used for filter circuit and transformer of transformer to have is: the embodiment of the utility model provides a be provided with the filtering link behind the rectification link of transformer to can eliminate the harmonic interference that the rectification link produced completely, purify electric wire netting power supply environment, guarantee relevant electrical equipment's normal steady operation, promote intelligent servo transformer's popularization and application.

Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:

fig. 1 is a schematic structural diagram of a filter circuit for a transformer according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a filter circuit according to a preferred embodiment of the present invention; and

fig. 3 is a schematic circuit diagram of a filter circuit for a transformer in an example of an embodiment of the present invention.

Description of the reference numerals

100. A filter circuit; 200. a power source; 300. a load;

110. a rectification module; 120. a first filtering module; 130. a second filtering module;

Detailed Description

The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.

The term "connected" as used in the embodiments of the present invention is mainly used to mean "electrically connected", which is used to describe signal connection between two components, for example, through circuit connection, and the term "connected" may be direct electrical connection between two components or indirect electrical connection through other components or circuits. In addition, "first" and "second" referred to in the embodiments of the present invention are only for illustrating different modules, and do not indicate the number of modules. In addition, the "filter unit" according to the embodiment of the present invention may be a circuit formed by a plurality of elements, or may be a single element having a filter function.

Fig. 1 is a schematic structural diagram of a filter circuit for a transformer according to an embodiment of the present invention, wherein the filter circuit for a transformer is disposed on a line between a power source 200 and a load 300 powered by the power source 200, wherein the power source 200 is, for example, a three-phase ac 380V industrial power source, and the load 300 is, for example, a circuit or an electrical appliance of a servo system, a frequency conversion system, a stepping system, and the like.

As shown in fig. 1, a filter circuit 100 for a transformer according to an embodiment of the present invention includes: a rectifying module 110, the input side of which is connected to the power supply 200, and is configured to rectify a power supply output signal of the power supply 200; and a first filtering module 120, disposed between the output side of the rectifying module 110 and the load 300, for filtering the signal rectified by the rectifying module 110 and outputting the filtered signal to the load 300.

Fig. 2 is a schematic structural diagram of a filter circuit according to a preferred embodiment of the present invention, and as shown in fig. 2, the filter circuit 100 may further include: and a second filtering module 130, disposed between the power supply 200 and the input side of the rectifying module 110, for performing primary filtering on the power supply output signal, and transmitting the primary filtered signal to the rectifying module 110.

The rectifying module 110, the first filtering module 120, the second filtering module 130, and their respective related signal processing of the filtering circuit for a transformer according to the embodiments of the present invention are described in detail below with reference to examples.

Fig. 3 is a schematic circuit diagram of a filter circuit in an example of an embodiment of the present invention, the filter circuit being integrated in a transformer, for example. As shown in fig. 3, the power supply 200 is, in this example, a 380V three-phase ac power supply, where UVW represents U, V, W three phases, corresponding to live wire A, B, C, and N represents neutral wire input.

In this example, the main function of the second filtering module 130 is to primarily filter the power output signal to suppress the generation of voltage spikes and buffer current surges, thereby effectively protecting the components in the load 300 from damage. Referring to fig. 3, in this example, the second filtering module 130 may be a common mode coil module including a plurality of common mode coils, and each phase of the power supply 200 is connected to at least one common mode coil of the plurality of common mode coils, e.g., U, V, W and N wires are each connected to one common mode coil. In other examples, the three-phase four-wires of the three-phase ac power source may all be connected to at least one common mode coil of the plurality of common mode coils, e.g., U, V, W and N-four wires are collectively connected to the same common mode coil.

The common mode coil can reduce the strong impact of a three-phase alternating current power supply to various electronic elements in a load circuit or an electrical appliance when the load is started, inhibit voltage mutation from damaging the electronic elements, improve the filtering effect and achieve the function of protecting the load circuit or the electrical appliance. In addition, the common mode coil has the advantages of simple processing technology, low price, easy installation by matching with a three-phase alternating current power supply and the like. It should be noted that, in other embodiments, the second filtering module 130 may also be composed of a magnetic ring, or a filtering element (such as a filtering capacitor and a filtering inductor), or two or more of a common mode coil, a magnetic ring and a filtering element, which is not limited in this embodiment of the present invention.

Referring again to fig. 3, in this example, the rectifier module 110 may include a plurality of rectifier DIODEs, such as three rectifier DIODEs DIODE connected in parallel in fig. 3. It should be noted that the embodiment of the present invention is not limited to the structure of the rectifier module 110, and only requires that it can rectify the primary filtered power output signal to realize AC-DC conversion, so that it can be understood that, besides the parallel rectifier diodes shown in fig. 3, the rectifier module 110 can also be formed by a plurality of rectifier diodes connected in series or can directly adopt a packaged rectifier diode. More preferably, the rectifier diodes connected in parallel, the rectifier diodes connected in series and the rectifier diodes in package form are respectively used as three rectifier units, and the rectifier module can also be a combination of any two or more of the three rectifier units formed by connecting in series or in parallel.

Further, for the first filtering module 120, there may be various structures consisting of a filtering element (capacitor or inductor), a magnetic loop and/or an RC circuit, one of which is shown in fig. 3. As shown in fig. 3, the filtering elements are capacitors CX1-CX3, CY1-CY3, CY4-CY6 and CY7-CY9 (which may be inductors in other examples) respectively corresponding to U, V, W three phases; the magnetic rings are L1 and L2, and the magnetic rings L1 and L2 respectively comprise three groups of coils for filtering corresponding to U, V, W three phases respectively; the RC circuit comprises an R2-CX5 circuit, an R1-CX4 circuit and an R3-CX6 circuit which respectively correspond to U, V, W three phases and are connected in parallel, wherein R1-R3 represent resistors, and CX4-CX6 represent capacitors. Accordingly, taking the reference numerals of the elements in fig. 3 as examples, the structure of the first filtering module 120 may include the following three cases:

1) the first filtering module 120 is any one of a filtering element, a magnetic loop and an RC circuit.

Referring to fig. 3, in this case, the first filtering module 120 may be a separate capacitor CX1-CX3, a separate magnetic loop L1, or a separate RC circuit as described above.

2) The first filtering module 120 is a circuit formed by connecting any two or three of a filtering element, a magnetic ring and an RC circuit in series.

In the case of the 1) and the 2) cases, the first filtering module 120 is, for example, a circuit formed by connecting two or three of the capacitors CX1-CX3, the magnetic loop L1 and the RC circuit in series.

3) The first filtering module 120 includes at least two stages of filtering units connected in series, wherein each stage of filtering unit is configured to be capable of harmonic filtering.

It should be noted that the filtering unit includes, but is not limited to, a filtering element, a magnetic loop, and/or an RC circuit, and any other element or circuit capable of achieving harmonic filtering may be used as the filtering unit, which is not limited in this embodiment of the present invention.

Preferably, each stage of the filtering unit is configured as any one of a filtering element, a magnetic loop and an RC circuit, as shown in case 1); or each stage of the filter unit is configured as a circuit formed by connecting any two or more of the filter element, the magnetic loop, and the RC circuit in series as shown in the case of 2).

This case 3) can be described in conjunction with fig. 3, and as shown in fig. 3), in case 3), the first filtering module 120 can include the following multi-stage filtering units connected in series from left to right: the first-stage filtering units CX1-CX 3; a second-stage filtering unit L1; a third stage of filtering unit RC circuit (R2-CX 5, R1-CX4 and R3-CX6 which are connected in parallel); the fourth-stage filter units CY1-CY 3; a fifth-stage filtering unit L2; sixth-stage filtering units CY4-CY 6; and seventh-stage filtering units CY7-CY 9. In addition, the division of the seven-stage filtering unit shown in fig. 3 is not fixed, and for example, the first to third-stage filtering units may be divided into new first-stage filtering units, and the fourth to seventh filtering units may be divided into new second-stage filtering units. Therefore, it can be seen that the filtering units of the embodiments of the present invention may be independent filtering elements, magnetic rings or RC circuits, or any two or three of them may be combined in a serial manner.

To sum up, the embodiment of the utility model provides a designed the filter circuit to the transformer, this filter circuit is provided with the filtering link behind the rectification link to can eliminate the harmonic interference that the rectification link produced completely, purify electric wire netting power supply environment, guarantee relevant electrical equipment's normal steady operation, promote intelligent servo transformer's popularization and application.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A filter circuit for a transformer, the filter circuit being disposed in line between a power source and a load and comprising:

the input side of the rectification module is connected with the power supply and is used for rectifying a power supply output signal of the power supply; and

and the first filtering module is arranged between the output side of the rectifying module and the load and used for filtering the signal rectified by the rectifying module and outputting the signal subjected to filtering to the load.

2. The filter circuit according to claim 1, wherein the filter circuit for a transformer further comprises:

and the second filtering module is arranged between the power supply and the input side of the rectifying module and is used for carrying out primary filtering on the power supply output signal and transmitting the signal subjected to the primary filtering to the rectifying module.

3. The filter circuit of claim 2, wherein the second filter module is comprised of one or more of a common mode coil, a magnetic loop, and a filter element.

4. The filter circuit of claim 3, wherein the power supply is a three-phase alternating current power supply, and wherein the filter module is a common-mode coil module comprising a plurality of common-mode coils:

each phase of the three-phase AC power supply is connected to at least one common mode coil of the plurality of common mode coils, or

The three-phase four-wire of the three-phase alternating current power supply is all connected to at least one common mode coil of the plurality of common mode coils.

5. The filter circuit of claim 1, wherein the first filter module is any one of a filter element, a magnetic loop, and an RC circuit.

6. The filter circuit according to claim 1, wherein the first filter module is a circuit formed by connecting any two or three of a filter element, a magnetic loop and an RC circuit in series.

7. The filter circuit of claim 1, wherein the first filter module comprises at least two stages of filter units connected in series, wherein each stage of filter units is configured to enable harmonic filtering.

8. The filter circuit according to claim 7, wherein the filter unit of each stage is configured as any one of a filter element, a magnetic loop, and an RC circuit.

9. The filter circuit according to claim 7, wherein the filter units of each stage are configured as a circuit formed by any two or more of a filter element, a magnetic loop, and an RC circuit in series.

10. A transformer, characterized in that it comprises a filter circuit according to any one of claims 1-9.