CN216355974U - Active filter - Google Patents
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- CN216355974U CN216355974U CN202122063946.0U CN202122063946U CN216355974U CN 216355974 U CN216355974 U CN 216355974U CN 202122063946 U CN202122063946 U CN 202122063946U CN 216355974 U CN216355974 U CN 216355974U
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Abstract
The application provides an active filter, which is arranged in an active filter case and connected in parallel between a power supply and an input end of a conversion circuit, wherein the active filter case comprises a case; the bottom of the machine shell is provided with parallel guide rails, and one side of the machine shell is provided with a sub-interface board; a main circuit board and a control circuit board are arranged in the shell; the main circuit board and the control circuit board are electrically connected with the sub-interface board; the sub-interface board is provided with an input interface and an output interface; the input interface is respectively coupled to the positive pole of the power supply and the positive pole of the input end of the conversion circuit; the output interface is respectively coupled to the negative pole of the power supply and the negative pole of the input end of the conversion circuit. The active filter provided by the embodiment of the application has the advantages of simple structure and better filtering effect.
Description
Technical Field
The application belongs to the field of filters, and particularly relates to an active filter.
Background
With the development of power electronic technology, power electronic devices are used more and more frequently, and more nonlinear devices such as rectifiers, variable frequency motors, cranes and the like are connected to a power grid, and along with the use of the nonlinear devices, a large number of harmonics are injected into the power grid, so that too high waves have great harm, and not only are the use of devices on a user side affected, the stability of electric energy affected, but also the protection device on the power grid side significantly affected, and the filtering of harmonic filtering generated by nonlinear loads is a problem which is focused on solving by power electronic engineers.
At present, the filtering effect of passive filtering and the stability of equipment are poor, and the design of active filtering is generally more complicated, so that the technical scheme of active filtering is provided based on the active filtering method and the active filtering device.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an active filter, which can at least solve the problem of poor passive filtering effect in the prior art.
The active filter provided by the embodiment of the application is arranged in an active filter case and connected in parallel between a power supply and the input end of a conversion circuit, and the active filter case comprises a case; the bottom of the machine shell is provided with parallel guide rails, and one side of the machine shell is provided with a sub-interface board;
a main circuit board and a control circuit board are arranged in the shell; the main circuit board and the control circuit board are electrically connected with the sub-interface board; the sub-interface board is provided with an input interface and an output interface;
the input interface is respectively coupled to the positive pole of the power supply and the positive pole of the input end of the conversion circuit;
the output interface is respectively coupled to the negative pole of the power supply and the negative pole of the input end of the conversion circuit.
In some optional embodiments, the main circuit on the main circuit board comprises: a full bridge circuit, an inductor and a capacitor; the full-bridge circuit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube;
the first switching tube and the fourth switching tube are connected in series to form a first sub-circuit;
the second switching tube and the third switching tube are connected in series to form a second sub-circuit;
the first sub-circuit is connected with the second sub-circuit in parallel; the first sub-circuit is also connected with the capacitor in parallel;
one end of the inductor is coupled to a node between the first switch tube and the fourth switch tube, and the other end of the inductor is used as the input end of the active filter and is connected to the input interface of the sub-interface board;
and a node between the second switching tube and the third switching tube is used as an output end of the active filter and is connected to the output interface of the sub-interface board.
In some alternative embodiments, the inductor is a filter inductor.
In some optional embodiments, the capacitor is one or a group of energy storage capacitors.
In some optional embodiments, the filter cabinet is disposed within a slot of the cabinet.
In some optional embodiments, the bottom of the machine shell is provided with a bottom plate; the main circuit board and the sub interface board are both arranged on the bottom plate.
In some alternative embodiments, two rectangular frame support beams are disposed in the casing, and both the casing and the bottom plate are fixed on the rectangular frame support beams.
In some alternative embodiments, parallel guide rails are provided on both edges of the base plate.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
according to the active filter provided by the embodiment of the application, the passive filter and the large capacitor are not introduced, the active filter is small in size, low-frequency noise caused by nonlinear load can be effectively inhibited, and the filtering effect is good.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is an exploded view of an active filter structure according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of an active filter according to an embodiment of the present application.
Description of reference numerals:
1. a housing; 2. a base plate; 3. a sub-interface board; 4. a main circuit board; 5. a rectangular frame support beam; 201. parallel guide rails.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
As described in the background art, the passive filter in the prior art has poor effect, and the active filter also has some problems of complex structure, which is inconvenient for modular installation and use.
Based on the discovery, the application provides an active filter, can solve the problem that the filter effect is not good among the prior art at least.
The active filter provided by the embodiments of the present application is received in detail below with reference to the accompanying drawings.
The embodiment of the application provides an active filter, which is arranged in an active filter case and connected between a power supply and an input end of a conversion circuit in parallel.
The structure of the active filter provided by the present application will be described first with reference to fig. 1.
The active filter case comprises a case 1; the bottom of the casing 1 is provided with a parallel guide rail 201, and one side of the casing 1 is provided with a sub-interface board 3; a main circuit board 4 and a control circuit board are arranged in the casing 1; the main circuit board 4 and the control circuit board are electrically connected with the sub-interface board 3; the sub-interface board 3 is provided with an input interface and an output interface; the input interface is respectively coupled to the positive pole of the power supply and the positive pole of the input end of the conversion circuit; the output interface is respectively coupled to the negative pole of the power supply and the negative pole of the input end of the conversion circuit.
There may be a plurality of active filter cases in actual use. Therefore, the filter can be used as a modular structure, and is convenient for workers to install. And the filter cases can be arranged in the groove body of the cabinet.
In some embodiments, the bottom of the casing 1 is provided with a bottom plate 2. The main circuit board 4 and the sub interface board 3 are both mounted on the base plate 2. Two rectangular frame supporting beams 5 are arranged in the machine shell 1, and the machine shell 1 and the bottom plate 2 are fixed on the rectangular frame supporting beams 5. The parallel guide rails 201 are disposed on both sides of the base plate 2.
Wherein, the casing 1 can be formed by processing a convex steel plate, and three sides are bent downwards. The back end of the casing 1 is blocked by the sub-interface board 3 to form an active filter case.
The circuit of the active filter in the embodiment of the present application will be described with reference to fig. 2.
It should be noted that the circuit of the active filter in the embodiment of the present application may adopt an active filter circuit in the prior art. The active filter circuit provided by the embodiment of the application is a preferable active filter structure matched with the filter structure, and the active filter circuit and the filter structure are matched for use, so that the active filter circuit can be easily produced, manufactured, installed and used.
The main circuit board of the above embodiment has a main circuit thereon, and the control circuit board has a control circuit thereon.
The control circuit may be configured to detect the first current output by the negative electrode of the input terminal of the conversion circuit to obtain a harmonic component in the first current, and generate the control signal according to the harmonic component.
The main circuit may be configured to generate a second current having a phase opposite to that of the harmonic component under the control of the control signal, so that a source current formed after the first current and the second current flow through the power supply is a direct current.
The main circuit on the main circuit board in the above embodiment may include: a full bridge circuit, an inductor and a capacitor; the full-bridge circuit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube.
The first switching tube and the fourth switching tube are connected in series to form a first sub-circuit;
the second switching tube and the third switching tube are connected in series to form a second sub-circuit;
the first sub-circuit is connected with the second sub-circuit in parallel; the first sub-circuit is also connected with the capacitor in parallel;
one end of the inductor is coupled to a node between the first switch tube and the fourth switch tube, and the other end of the inductor is used as the input end of the active filter and is connected to the input interface of the sub-interface board;
and a node between the second switching tube and the third switching tube is used as an output end of the active filter and is connected to the output interface of the sub-interface board.
As an example, the inductance may be a filter inductance.
As an example, the capacitor may be one or a group of storage capacitors.
The control signal in the foregoing may include a first control signal and a second control signal. The second control signal is an inverted signal of the first control signal.
The control ends of the first switch tube and the third switch respectively receive a first control signal.
The control ends of the second switch tube and the fourth switch respectively receive a second control signal.
The main circuit is used for conducting and switching the full-bridge circuit under the control of the control signal, so that the charging and discharging of the inductor and the capacitor are controlled, and a second current is generated.
It should also be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not intended to limit the present application.
It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.
Claims (8)
1. The utility model provides an active filter, sets up in active filter machine case, connects in parallel between power and converting circuit's input, its characterized in that: the active filter cabinet comprises a shell; the bottom of the shell is provided with parallel guide rails, and one side of the shell is provided with a sub-interface board;
a main circuit board and a control circuit board are arranged in the shell; the main circuit board and the control circuit board are electrically connected with the sub-interface board; the sub-interface board is provided with an input interface and an output interface;
the input interface is respectively coupled to the positive pole of the power supply and the positive pole of the input end of the conversion circuit;
the output interface is coupled to a negative electrode of the power supply and a negative electrode of the input end of the conversion circuit respectively.
2. An active filter according to claim 1, wherein the main circuit on the main circuit board comprises: a full bridge circuit, an inductor and a capacitor; the full-bridge circuit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube;
the first switching tube and the fourth switching tube are connected in series to form a first sub-circuit;
the second switching tube and the third switching tube are connected in series to form a second sub-circuit;
the first sub-circuit is connected in parallel with the second sub-circuit; the first sub-circuit is also connected in parallel with the capacitor;
one end of the inductor is coupled to a node between the first switch tube and the fourth switch tube, and the other end of the inductor is used as an input end of the active filter and is connected to an input interface of the sub-interface board;
and a node between the second switching tube and the third switching tube is used as an output end of the active filter and is connected to an output interface of the sub-interface board.
3. An active filter according to claim 2, characterized in that the inductance is a filter inductance.
4. An active filter according to claim 2, wherein the capacitor is a storage capacitor or a bank of storage capacitors.
5. The active filter of claim 1, wherein the filter case is disposed in a slot of the cabinet.
6. An active filter according to claim 1, wherein the bottom of the housing is provided with a bottom plate; the main circuit board and the sub interface board are both arranged on the bottom plate.
7. The active filter according to claim 6, wherein two rectangular frame support beams are provided in the housing, and the housing and the bottom plate are fixed to the rectangular frame support beams.
8. An active filter according to claim 6, characterized in that the parallel guides are arranged on both sides of the base plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202122063946.0U CN216355974U (en) | 2021-08-30 | 2021-08-30 | Active filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202122063946.0U CN216355974U (en) | 2021-08-30 | 2021-08-30 | Active filter |
Publications (1)
Publication Number | Publication Date |
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CN216355974U true CN216355974U (en) | 2022-04-19 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN202122063946.0U Active CN216355974U (en) | 2021-08-30 | 2021-08-30 | Active filter |
Country Status (1)
Country | Link |
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CN (1) | CN216355974U (en) |
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2021
- 2021-08-30 CN CN202122063946.0U patent/CN216355974U/en active Active
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