CN218276459U - Filter circuit, power supply module and air conditioner - Google Patents
Filter circuit, power supply module and air conditioner Download PDFInfo
- Publication number
- CN218276459U CN218276459U CN202222639405.2U CN202222639405U CN218276459U CN 218276459 U CN218276459 U CN 218276459U CN 202222639405 U CN202222639405 U CN 202222639405U CN 218276459 U CN218276459 U CN 218276459U
- Authority
- CN
- China
- Prior art keywords
- common
- inductor
- capacitor
- mode
- common mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Filters And Equalizers (AREA)
Abstract
The disclosure relates to a filter circuit, a power supply module and an air conditioner. The filter circuit includes: the common mode inductor, the first group of common mode capacitors, the second group of common mode capacitors, a first grounding terminal and a second grounding terminal which is arranged at different positions from the first grounding terminal; the common mode inductor comprises a first input end, a second input end, a first output end and a second output end; the first input end and the first output end are two ends of a first coil of the common mode inductor, and the second input end and the second output end are two ends of a second coil of the common mode inductor; the first group of common mode capacitors are connected between the first input end and the second input end and connected with the first grounding end; and the second group of common mode capacitors are connected between the first output end and the second output end and connected with the second grounding end. The influence of common mode interference in the filter circuit can be reduced through the embodiment of the disclosure.
Description
Technical Field
The utility model relates to an air conditioner field especially relates to a filter circuit, power module and air conditioner.
Background
With the rapid development of frequency conversion technology, the equipment is also pursuing faster logic circuits, and brings many Electromagnetic compatibility problems, and more efforts are necessary for air conditioners to ensure the Electromagnetic Interference (EMI) requirements of products.
At present, in order to reduce EMI interference, two pairs of common mode capacitors are arranged at the front and rear stages of a common mode inductor in a filter circuit of an air conditioner, and the grounding of the common mode capacitors has a good inhibition effect on the common mode interference.
However, in the prior art, two pairs of common mode capacitors are connected to the same ground at the board level, so that a mutual inductance phenomenon exists between the two pairs of common mode capacitors, which results in a great influence on common mode interference in the filter circuit.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems in the related art, the present disclosure provides a filter circuit, a power supply module and an air conditioner.
According to a first aspect of embodiments of the present disclosure, there is provided a filter circuit, including at least: the common mode inductor, the first group of common mode capacitors, the second group of common mode capacitors, a first grounding terminal and a second grounding terminal which is arranged at different positions from the first grounding terminal;
the common mode inductor comprises a first input end, a second input end, a first output end and a second output end; the first input end and the first output end are two ends of a first coil of the common-mode inductor, and the second input end and the second output end are two ends of a second coil of the common-mode inductor;
the first group of common mode capacitors are connected between the first input end and the second input end and connected with the first grounding end;
and the second group of common mode capacitors are connected between the first output end and the second output end and connected with the second grounding end.
In some embodiments, the first ground terminal is located on a side of the first set of common mode capacitors away from the second set of common mode capacitors;
the second ground terminal is located between the first set of common mode capacitors and the second set of common mode capacitors.
In some embodiments, the first ground terminal is located on a side of the first set of common mode capacitors away from the second set of common mode capacitors;
the second grounding end is positioned on one side of the second group of common-mode capacitors far away from the first group of common-mode capacitors.
In some embodiments, the first ground is located between the first set of common-mode capacitors and the second set of common-mode capacitors;
the second ground terminal is located on one side of the second group of common mode capacitors away from the first group of common mode capacitors.
In some embodiments, the filter circuit further comprises:
the first routing inductor is connected with the first group of common-mode capacitors and the first grounding end and used for increasing the impedance of a circuit where the first group of common-mode capacitors are located;
and the second routing inductor is connected with the second group of common-mode capacitors and the second grounding terminal and is used for increasing the impedance of the circuit where the second group of common-mode capacitors are located.
In some embodiments, the first set of common mode capacitances comprises: a first common mode capacitance and a second common mode capacitance; the second set of common mode capacitances comprises: a third common mode capacitor and a fourth common mode capacitor;
the first common mode capacitor is connected between the second input end and the first routing inductor;
the second common-mode capacitor is connected between the first input end and the first routing inductor;
the third common mode capacitor is connected between the second output end and the second routing inductor;
the fourth common mode capacitor is connected between the first output end and the second routing inductor.
In some embodiments, the filter circuit further comprises: the circuit comprises a power input end, a power output end and a line impedance stabilizing network circuit;
the common mode inductor is connected between the line impedance stabilizing network circuit and the power output end;
the input end of the line impedance stabilizing network circuit is connected with the power supply input end;
a first output terminal of the line impedance stabilization network circuit is connected to the first input terminal of the common mode inductor, and a second output terminal of the line impedance stabilization network circuit is connected to the second input terminal of the common mode inductor;
and the grounding end of the line impedance stabilizing network circuit is connected with the first grounding end.
In some embodiments, the line impedance stabilization network circuit comprises: the circuit comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor and a second resistor;
the first inductor is connected between the power supply input end and the first input end and is connected with the first capacitor and the third capacitor;
the second inductor is connected between the power input end and the second input end and is connected with the second capacitor and the fourth capacitor;
the first capacitor is connected with the first inductor and the first grounding end;
the second capacitor is connected with the second inductor and the first grounding end;
the third capacitor is connected with the first inductor and the first resistor;
the fourth capacitor is connected with the second inductor and the second resistor;
the first resistor is connected with the third capacitor and the first grounding end;
the second resistor is connected with the fourth capacitor and the first grounding terminal.
According to a second aspect of the embodiments of the present disclosure, there is provided a power supply module, at least including:
a power supply circuit;
the filter circuit according to the first aspect, connected to the power circuit, for filtering a power supply signal output by the power circuit.
According to a third aspect of the embodiments of the present disclosure, there is provided an air conditioner including at least:
the power supply module and the power utilization module connected with the filter circuit in the power supply module are provided;
and the power supply circuit of the power supply module supplies power to the power utilization module through the filter circuit.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the embodiment of the present disclosure provides a filter circuit, power supply module and air conditioner, filter circuit includes: the common mode inductor, the first group of common mode capacitors, the second group of common mode capacitors, a first grounding terminal and a second grounding terminal which is arranged at different positions from the first grounding terminal; the common mode inductor comprises a first input end, a second input end, a first output end and a second output end; the first input end and the first output end are two ends of a first coil of the common mode inductor, and the second input end and the second output end are two ends of a second coil of the common mode inductor; the first group of common mode capacitors are connected between the first input end and the second input end and connected with the first grounding end; the second group of common mode capacitors is connected between the first output end and the second output end and is connected with the second grounding end. Therefore, the common-mode capacitors can be different from the ground terminals connected to the same position in the prior art, in the embodiment of the disclosure, the first ground terminal connected to the first common-mode capacitor and the second ground terminal connected to the second common-mode capacitor are respectively arranged at different positions, so as to reduce the mutual inductance between the first common-mode capacitor and the second common-mode capacitor, and reduce the coupling of the second common-mode capacitor to the loop of the first common-mode capacitor, thereby reducing the influence of common-mode interference in the filter circuit.
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 disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a first schematic diagram illustrating a filter circuit according to an exemplary embodiment.
Fig. 2a to 2c are schematic diagrams illustrating positions of a first ground terminal and a second ground terminal in a filter circuit according to an exemplary embodiment.
Fig. 3 is a schematic diagram of a filter circuit according to an exemplary embodiment.
Fig. 4 is a schematic diagram of a filter circuit according to an exemplary embodiment.
Fig. 5 is a block diagram of a filter circuit according to an exemplary embodiment.
Fig. 6 is a schematic diagram of a filter circuit according to an exemplary embodiment.
Fig. 7 is a sixth block diagram illustrating a filter circuit according to an exemplary embodiment.
Fig. 8 is a schematic diagram illustrating a structure of a conventional filter circuit according to an exemplary embodiment.
Fig. 9 is a schematic diagram of a printed circuit board with a filter circuit according to an exemplary embodiment.
Fig. 10a is a schematic diagram illustrating noise interference in a conventional filter circuit according to an exemplary embodiment.
Fig. 10b is a schematic diagram illustrating noise interference in a filter circuit according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of circuitry consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The technical solutions provided by the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram illustrating a structure of a filter circuit according to an exemplary embodiment, and as shown in fig. 1, a filter circuit 100 provided in an embodiment of the present disclosure may include: the common mode inductor L, the first group of common mode capacitors YI, the second group of common mode capacitors YII, a first grounding terminal D1 and a second grounding terminal D2 which is arranged at different positions from the first grounding terminal D1;
the common mode inductor L comprises a first input end a1, a second input end a2, a first output end b1 and a second output end b2; the first input end a1 and the first output end b1 are two ends of a first coil of the common mode inductor L, and the second input end a2 and the second output end b2 are two ends of a second coil of the common mode inductor L;
the first set of common mode capacitors YI is connected between the first input end a1 and the second input end a2, and is connected to the first ground end D1;
the second group of common mode capacitors YII is connected between the first output terminal b1 and the second output terminal b2, and is connected to the second ground terminal D2.
In the embodiment of the present disclosure, the common mode inductor may be a common mode interference suppression device using ferrite or the like as a magnetic core, and two coils with the same size and the same number of turns are symmetrically wound on the same ferrite annular magnetic core, and the winding directions of the coils are opposite to each other, so as to form a four-terminal device.
The common mode inductor may include a first coil and a second coil, the first coil may include the first input terminal and the first output terminal, and the second coil may include the second input terminal and the second output terminal.
Here, the first set of common mode capacitances and the second set of common mode capacitances may each be capacitances connected across the power line (i.e., the hot and neutral lines) and ground, e.g., between the hot line and ground, or between the neutral line and ground, respectively. The common-mode capacitor (Y-capacitor) is one of the safety capacitors, and may be generally present in pairs, and the Y-capacitor may be used to suppress common-mode interference. Wherein the value of the Y capacitance cannot be too large due to the limitation of the leakage current, the Y capacitance being of the nano-farad (nF) class.
It should be noted that, the number of the common-mode capacitors included in the first group of common-mode capacitors and the second group of common-mode capacitors may be set according to an actual application, and the embodiment of the disclosure is not limited. For example, the first set of common-mode capacitors may include two common-mode capacitors, and the second set of common-mode capacitors may also include two common-mode capacitors; or, the first group of common-mode capacitors may include two common-mode capacitors, and the second group of common-mode capacitors may include four common-mode capacitors; and so on.
In an embodiment of the present disclosure, the first ground terminal and the second ground terminal may include: the first grounding end and the second grounding end are different in position and are connected to the same grounding line; the method can also comprise the following steps: the first grounding terminal and the second grounding terminal are different in position and are connected to different grounding lines. Here, the filter circuit has two ground terminals, which can be equivalent to an additional ground terminal of the existing filter circuit; the different ground wires may include an original ground wire on a Printed Circuit Board (PCB) where the filter Circuit is located, and a newly added ground wire on the PCB; the newly added grounding wire and the original grounding wire on the PCB can be respectively connected with the first grounding end and the second grounding end so as to reduce the mutual inductance phenomenon between two groups of common-mode capacitors connected with the two grounding ends.
When the filter circuit is applied to an air conditioner, the ground lines to which the first ground terminal and the second ground terminal are connected may be connected to the ground through a casing of the air conditioner.
It is to be understood that, in an embodiment of the present disclosure, the filter circuit may further include: a power input terminal and a power output terminal; the common mode inductor may be connected between the power input terminal and the power output terminal, so that the common mode inductor filters a signal input from the power input terminal and outputs the filtered signal to the power output terminal.
The power supply input end can comprise a live wire input end and a zero line input end, and the power supply output end can comprise a live wire output end and a zero line output end; correspondingly, the first input end of the common mode inductor can be connected with the live wire input end, the second input end of the common mode inductor can be connected with the zero line input end, the first output end of the common mode inductor can be connected with the live wire output end, and the second output end of the common mode inductor can be connected with the zero line output end.
The embodiment of the present disclosure provides a filter circuit, which includes: the common mode inductor, the first group of common mode capacitors, the second group of common mode capacitors, a first grounding terminal and a second grounding terminal which is arranged at different positions from the first grounding terminal; the common mode inductor comprises a first input end, a second input end, a first output end and a second output end; the first input end and the first output end are two ends of a first coil of the common mode inductor, and the second input end and the second output end are two ends of a second coil of the common mode inductor; the first group of common mode capacitors are connected between the first input end and the second input end and connected with the first grounding end; the second group of common mode capacitors is connected between the first output end and the second output end and is connected with the second grounding end. Therefore, the common-mode capacitors can be different from the ground terminals connected to the same position in the prior art, in the embodiment of the disclosure, the first ground terminal connected to the first common-mode capacitor and the second ground terminal connected to the second common-mode capacitor are respectively arranged at different positions, so as to reduce the mutual inductance between the first common-mode capacitor and the second common-mode capacitor, and reduce the coupling of the second common-mode capacitor to the loop of the first common-mode capacitor, thereby reducing the influence of common-mode interference in the filter circuit.
It should be noted that specific setting positions of the first ground terminal and the second ground terminal may be selected according to an actual application, and the embodiment of the disclosure is not limited.
For example, in one embodiment, as shown in fig. 2a, the first ground terminal D1 is located on a side of the first common-mode capacitor YI away from the second common-mode capacitor YI; the second ground terminal D2 is located between the first set of common mode capacitors YI and the second set of common mode capacitors YII. Therefore, the first grounding end and the second grounding end can be separately arranged through the first group of common-mode capacitors, so that the mutual inductance phenomenon between the first group of common-mode capacitors and the second group of common-mode capacitors is reduced.
In another embodiment, as shown in fig. 2b, the first ground terminal D1 is located on a side of the first common-mode capacitor YI away from the second common-mode capacitor YI; the second ground terminal D2 is located at a side of the second common mode capacitor YII away from the first common mode capacitor YI. Therefore, the first grounding end and the second grounding end can be separately arranged through the first group of common-mode capacitors and the second group of common-mode capacitors, so that the mutual inductance phenomenon between the first group of common-mode capacitors and the second group of common-mode capacitors is reduced.
In another embodiment, as shown in fig. 2c, the first ground terminal D1 is located between the first set of common-mode capacitors YI and the second set of common-mode capacitors YI; the second ground terminal D2 is located on a side of the second common-mode capacitor YII away from the first common-mode capacitor YI. Therefore, the first grounding end and the second grounding end can be separately arranged through the second group of common-mode capacitors, so that the mutual inductance phenomenon between the first group of common-mode capacitors and the second group of common-mode capacitors is reduced.
Therefore, the common-mode interference problem in the filter circuit can be fundamentally solved through various different arrangement positions of the first grounding end and the second grounding end in the filter circuit from the angle that the two different grounding ends are arranged on the PCB where the filter circuit is arranged.
Fig. 3 is a schematic structural diagram of a second filtering circuit according to an exemplary embodiment, and as shown in fig. 3, in the filtering circuit provided in the embodiment of the present disclosure, other devices, for example, a first trace inductance and a second trace inductance, are further added on the basis of the filtering circuit shown in fig. 1.
As shown in fig. 3, the filter circuit 100 provided in the embodiment of the present disclosure may further include:
the first routing inductor M1 is connected to the first group of common-mode capacitors YI and the first ground terminal D1, and is configured to increase impedance of a line where the first group of common-mode capacitors YI is located;
and a second routing inductor M2 connected to the second group of common mode capacitors YII and the second ground terminal D2, for increasing the impedance of the line on which the second group of common mode capacitors YII is located.
In the embodiment of the disclosure, since the inductor may be dc-resistant and ac-resistant, when the filter circuit inputs ac, the impedance of the line where the first group of common mode capacitors is located may be increased through the first routing inductor, and the impedance of the line where the second group of common mode capacitors is located may be increased through the second routing inductor.
It should be noted that, inductance values of the first routing inductor and the second routing inductor may be set according to practical application, and the embodiment of the present disclosure is not limited. For example, the inductance values of the first and second trace inductances may each be 1.2 mega henries (mH); alternatively, the inductance value of the first trace inductor may be 1.2 mega henry, and the inductance value of the second trace inductor may be 2.2 mega henry; and so on.
Therefore, the impedance of the line corresponding to the first routing inductor and the second routing inductor respectively can be increased by arranging the first routing inductor between the first group of common mode capacitors and the first grounding end and arranging the second routing inductor between the second group of common mode capacitors and the second grounding end, so as to reduce the common mode interference in the filter circuit.
In one embodiment, as shown in fig. 4, the first set of common-mode capacitances YI may include: a first common-mode capacitor Y1 and a second common-mode capacitor Y2; the second set of common-mode capacitances yi may include: a third common mode capacitor Y3 and a fourth common mode capacitor Y4;
the first common mode capacitor Y1 is connected between the second input end a2 and the first routing inductor M1;
the second common-mode capacitor Y2 is connected between the first input end a1 and the first routing inductor M1;
the third common mode capacitor Y3 is connected between the second output end b2 and the second routing inductor M2;
the fourth common mode capacitor Y4 is connected between the first output end b1 and the second routing inductor M2.
It can be understood that the first common mode capacitor and the second common mode capacitor may be connected to the first ground terminal through the first trace inductor, and the third common mode capacitor and the fourth common mode capacitor may be connected to the second ground terminal through the second trace inductor.
In the embodiment of the disclosure, the common mode inductor may be connected between the power input end and the power output end of the filter circuit; the first input end can be connected with the live wire input end of the power input end, the second input end can be connected with the zero line input end of the power input end, the first output end can be connected with the live wire output end of the power output end, and the second output end can be connected with the zero line output end of the power output end. The first common-mode capacitor and the second common-mode capacitor may be connected in series between the live line input terminal and the neutral line input terminal, and the third common-mode capacitor and the fourth common-mode capacitor may be connected in series between the live line output terminal and the neutral line output terminal.
It should be noted that, specific specifications of the first common-mode capacitor and the second common-mode capacitor, and specific specifications of the third common-mode capacitor and the fourth common-mode capacitor may be set according to a practical application situation, and the embodiment of the present disclosure is not limited. For example, the specifications of the first common-mode capacitor and the second common-mode capacitor, and the specifications of the third common-mode capacitor and the fourth common-mode capacitor may be the same; or, the first common mode capacitor and the third common mode capacitor may have the same specification, and the second common mode capacitor and the fourth common mode capacitor may have the same specification; or, specifications of the first common mode capacitor and the second common mode capacitor, and specifications of the third common mode capacitor and the fourth common mode capacitor may be different; and so on.
The embodiment of the disclosure provides a filter circuit, which can increase the impedance of a line corresponding to a first line inductor and a second line inductor respectively by arranging the first line inductor between a first group of common mode capacitors and a first ground terminal and arranging the second line inductor between a second group of common mode capacitors and a second ground terminal, thereby reducing common mode interference in the filter circuit.
Fig. 5 is a schematic diagram illustrating a structure of a filter circuit according to an exemplary embodiment, and as shown in fig. 5, the filter circuit according to the embodiment of the present disclosure further adds other components, such as a power input terminal, a power output terminal, and a line impedance stabilizing network circuit, to the filter circuit shown in fig. 1.
As shown in fig. 5, the filter circuit 100 provided in the embodiment of the present disclosure may further include: the power supply circuit comprises a power supply input end IN, a power supply output end OUT and a line impedance stabilizing network circuit LISN;
the common-mode inductor L is connected between the line impedance stabilizing network circuit LISN and the power output end OUT;
the input end s1 of the line impedance stabilization network circuit LISN is connected with the power input end IN;
a first output end s2 of the line impedance stabilization network circuit LISN is connected to the first input end a1 of the common-mode inductor L, and a second output end s3 of the line impedance stabilization network circuit LISN is connected to the second input end a2 of the common-mode inductor L;
the ground terminal s4 of the line impedance stabilization network circuit LISN is connected to the first ground terminal D1.
The Line Impedance Stabilization Network circuit (LISN) is an important auxiliary device in an electromagnetic compatibility test in a power system; the LISN can isolate radio interference, provide stable test impedance, and act as a filter.
In an embodiment of the disclosure, the line impedance stabilizing network circuit and the first group of common mode capacitors may be connected to the first ground terminal. The line impedance stabilizing network circuit can be connected in series between the power input end and the common-mode inductor, so that the impedance in the filter circuit can be tested through the line impedance stabilizing network circuit.
It should be noted that, in order to test the impedance in the filter circuit, values of each device in the line impedance stabilization network circuit may be fixed, and may be set according to an actual application situation, which is not limited in the embodiment of the present disclosure.
In one embodiment, as shown in fig. 6, the line impedance stabilization network circuit LISN may include: the circuit comprises a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1 and a second resistor R2;
the first inductor L1 is connected between the power input terminal IN and the first input terminal a1, and is connected between the first capacitor C1 and the third capacitor C3;
the second inductor L2 is connected between the power input terminal IN and the second input terminal a2, and is connected between the second capacitor C2 and the fourth capacitor C4;
the first capacitor C1 is connected to the first inductor L1 and the first ground terminal D1;
the second capacitor C2 is connected to the second inductor L2 and the first ground terminal D1;
the third capacitor C3 is connected to the first inductor L1 and the first resistor R1;
the fourth capacitor C4 is connected to the second inductor L2 and the second resistor R2;
the first resistor R1 is connected to the third capacitor C3 and the first ground D1;
the second resistor R2 is connected to the fourth capacitor C4 and the first ground terminal D1.
Here, the power input terminal may include a live input terminal and a neutral input terminal, and the power output terminal may include a live output terminal and a neutral output terminal; accordingly, the first inductor may be connected between the live input and the first input of the common mode inductor, and the second inductor may be connected between the neutral input and the second input of the common mode inductor; the first output end of the common mode inductor can be connected with the live wire output end, and the second output end of the common mode inductor can be connected with the zero line output end.
The first capacitor can be connected between the input end of the live wire and the first grounding end, and the second capacitor can be connected between the input end of the zero wire and the second grounding end; the third capacitor may be connected between the first input terminal of the common mode inductor and the first resistor, and the fourth capacitor may be connected between the second input terminal of the common mode inductor and the second resistor.
It will be appreciated that the first capacitor and the second capacitor may be connected in series between the live input and the neutral input; the third capacitor, the first resistor, the second resistor, and the fourth capacitor may be connected in series between the first inductor and the second inductor in this order.
It should be noted that various values of the first inductor, the second inductor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the first resistor, and the second resistor may be set according to an actual application situation, and the embodiment of the present disclosure is not limited. For example, the inductance values of the first inductor and the second inductor may be the same, the capacitance values of the first capacitor and the second capacitor may be the same, the capacitance values of the third capacitor and the fourth capacitor may be the same, and the resistance values of the first resistor and the second resistor may be the same.
The embodiment of the disclosure provides a filter circuit, which can test the impedance of the filter circuit by arranging a line impedance stabilizing network circuit between a power input end and a common mode inductor; and the first grounding terminal connected with the line impedance stabilizing network circuit and the second grounding terminal connected with the second group of common-mode capacitors are respectively arranged at different positions, so that the second group of common-mode capacitors are coupled to the line impedance stabilizing network circuit, and the influence of common-mode interference in the filter circuit is reduced.
In an embodiment of the present disclosure, as shown in fig. 7, the filter circuit 100 may further include: a first differential mode capacitor X1 connected between the first input terminal a1 and the second input terminal a2 of the common mode inductor L, and a second differential mode capacitor X2 connected between the first output terminal b1 and the second output terminal b2 of the common mode inductor L, so that the differential mode interference in the filter circuit can be suppressed by providing the first differential mode capacitor and the second differential mode capacitor.
Here, the first differential mode capacitor and the second differential mode capacitor may be capacitors connected across two lines of the power line (i.e., the live line and the neutral line), and are generally metal thin film capacitors. The differential capacitance (X capacitance) is another type of safety capacitance, and the safety capacitance can be a capacitance which can not cause electric shock and does not endanger personal safety after the capacitor fails. Wherein, X electric capacity is microfarad (uF) level, and X electric capacity can be used for suppressing differential mode interference.
Fig. 8 is a schematic diagram illustrating a structure of a conventional filter circuit according to an exemplary embodiment. As shown in fig. 8, the front stage of the conventional common mode inductor L in the conventional filter circuit 200 provided by the embodiment of the present disclosure is provided with Y1 and Y2 capacitors, and the rear stage is provided with Y3 and Y4 capacitors. The grounding of the Y1 and Y2 capacitors and the grounding of the Y3 and Y4 capacitors have good inhibition effect on common-mode interference. However, since the Y1 and Y2 capacitors and the Y3 and Y4 capacitors are connected to the same ground terminal at the board level, a mutual inductance always exists between the first routing inductor M1 connected to the preceding Y1 and Y2 capacitors and the second routing inductor M2 connected to the succeeding Y3 and Y4 capacitors, and the capacitors are easily coupled to the circuit of the preceding Y1 and Y2 capacitors and the line impedance stabilization network circuit LISN through the succeeding Y3 and Y4 capacitors, which has a great influence on the common mode interference of the conventional filter circuit.
Based on this, with reference to fig. 7 and fig. 8, in order to reduce the influence of common mode interference, in the filter circuit provided in the embodiment of the present disclosure, on the basis of the above conventional filter circuit, the first group of common mode capacitors and the second group of common mode capacitors are grounded respectively, so as to reduce a mutual inductance phenomenon between the first group of common mode capacitors and the second group of common mode capacitors, and reduce the coupling of the second group of common mode capacitors to a loop of the first group of common mode capacitors, thereby reducing the influence of common mode interference in the filter circuit, suppressing common mode interference from a board-level source head, and improving the stability of the filter circuit; meanwhile, the first group of common-mode capacitors and the second group of common-mode capacitors are grounded separately to replace an original magnetic ring, so that the cost is reduced.
Fig. 9 is a schematic diagram of a printed circuit board on which a filter circuit is disposed according to an example embodiment. As shown in fig. 9, in the filter circuit according to the above embodiment of the disclosure, the first ground terminal D1 is disposed on a side of the second common mode capacitor Y2 on the PCB, which is far from the fourth common mode capacitor Y4, and the second ground terminal D2 is disposed between the second common mode capacitor Y2 and the fourth common mode capacitor Y4 on the PCB, so that the first ground terminal and the second ground terminal are separately disposed to reduce a mutual inductance between the first group of common mode capacitors and the second group of common mode capacitors.
Fig. 10a is a schematic diagram illustrating noise interference in a conventional filter circuit according to an exemplary embodiment. As shown in fig. 10a, in the conventional filter circuit, since the first common mode capacitor and the second common mode capacitor are connected to the same ground line, a mutual inductance phenomenon exists between the first wiring inductor connected to the first common mode capacitor and the second wiring inductor connected to the second common mode capacitor, so that noise of the conventional filter circuit at a high frequency band exceeds a set average value, that is, common mode interference of the conventional filter circuit at the high frequency band exceeds a standard.
Fig. 10b is a schematic diagram illustrating noise interference in a filter circuit according to an exemplary embodiment. As shown in fig. 10b, in the filter circuit provided in the embodiment of the present disclosure, since the first group of common-mode capacitors and the second group of common-mode capacitors are grounded respectively, a mutual inductance phenomenon between the first group of common-mode capacitors and the second group of common-mode capacitors is reduced, and the second group of common-mode capacitors is reduced from being coupled to a loop of the first group of common-mode capacitors, so that noise of the filter circuit in a high frequency band does not exceed a set average value, that is, the filter circuit in the embodiment of the present disclosure solves the problem that common-mode interference in the high frequency band exceeds a standard.
The power supply module provided by the embodiment of the disclosure can include: a power supply circuit; the filter circuit provided by the above embodiment of the present disclosure is connected to the power supply circuit, and is configured to filter the power supply signal output by the power supply circuit. Therefore, the power supply signal output by the power supply circuit can be filtered by arranging the filter circuit, so that the noise in the power supply signal output by the power supply circuit is reduced, and the stability of the power supply module is improved.
An air conditioner provided in an embodiment of the present disclosure may include: the power supply module and the power utilization module are connected with the filter circuit in the power supply module; the power supply circuit of the power supply module can better supply power to the power utilization module through the filter circuit.
Here, the power supply module may be a power supply terminal of the air conditioner, and is connected to an external power supply to energize the air conditioner; the electricity utilization module can be a compressor, an evaporator or a motor of an air conditioner and the like.
So, can export the signal of power supply module output to the power consumption module through filter circuit for the power consumption module can carry out work based on stable signal, thereby improves the stability of air conditioner.
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 phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus comprising the element.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A filter circuit, the filter circuit comprising: the common mode inductor, the first group of common mode capacitors, the second group of common mode capacitors, a first grounding terminal and a second grounding terminal which is arranged at different positions from the first grounding terminal;
the common mode inductor comprises a first input end, a second input end, a first output end and a second output end; the first input end and the first output end are two ends of a first coil of the common mode inductor, and the second input end and the second output end are two ends of a second coil of the common mode inductor;
the first group of common mode capacitors are connected between the first input end and the second input end and connected with the first grounding end;
and the second group of common mode capacitors are connected between the first output end and the second output end and connected with the second grounding end.
2. Filter circuit according to claim 1,
the first grounding end is positioned at one side of the first group of common-mode capacitors far away from the second group of common-mode capacitors;
the second ground terminal is located between the first set of common mode capacitors and the second set of common mode capacitors.
3. The filter circuit of claim 1,
the first grounding end is positioned on one side of the first group of common-mode capacitors far away from the second group of common-mode capacitors;
the second grounding end is positioned on one side of the second group of common-mode capacitors far away from the first group of common-mode capacitors.
4. The filter circuit of claim 1,
the first ground terminal is positioned between the first group of common-mode capacitors and the second group of common-mode capacitors;
the second grounding end is positioned on one side of the second group of common-mode capacitors far away from the first group of common-mode capacitors.
5. The filter circuit according to any one of claims 1 to 4, further comprising:
the first routing inductor is connected with the first group of common-mode capacitors and the first grounding end and used for increasing the impedance of a circuit where the first group of common-mode capacitors are located;
and the second routing inductor is connected with the second group of common-mode capacitors and the second grounding terminal and is used for increasing the impedance of the circuit where the second group of common-mode capacitors are located.
6. The filter circuit of claim 5, wherein the first set of common-mode capacitances comprises: a first common mode capacitance and a second common mode capacitance; the second set of common mode capacitances comprises: a third common mode capacitor and a fourth common mode capacitor;
the first common mode capacitor is connected between the second input end and the first routing inductor;
the second common mode capacitor is connected between the first input end and the first routing inductor;
the third common mode capacitor is connected between the second output end and the second routing inductor;
the fourth common mode capacitor is connected between the first output end and the second routing inductor.
7. The filter circuit according to any one of claims 1 to 4, further comprising: the circuit comprises a power input end, a power output end and a line impedance stabilizing network circuit;
the common mode inductor is connected between the line impedance stabilizing network circuit and the power output end;
the input end of the line impedance stabilizing network circuit is connected with the power supply input end;
a first output terminal of the line impedance stabilization network circuit is connected to the first input terminal of the common mode inductor, and a second output terminal of the line impedance stabilization network circuit is connected to the second input terminal of the common mode inductor;
and the grounding end of the line impedance stabilizing network circuit is connected with the first grounding end.
8. The filter circuit of claim 7, wherein the line impedance stabilization network circuit comprises: the circuit comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor and a second resistor;
the first inductor is connected between the power supply input end and the first input end and is connected with the first capacitor and the third capacitor;
the second inductor is connected between the power input end and the second input end and is connected with the second capacitor and the fourth capacitor;
the first capacitor is connected with the first inductor and the first grounding end;
the second capacitor is connected with the second inductor and the first grounding end;
the third capacitor is connected with the first inductor and the first resistor;
the fourth capacitor is connected with the second inductor and the second resistor;
the first resistor is connected with the third capacitor and the first grounding end;
the second resistor is connected with the fourth capacitor and the first grounding terminal.
9. A power module, comprising:
a power supply circuit;
the filter circuit of any of claims 1 to 8, connected to the power supply circuit for filtering a supply signal output by the power supply circuit.
10. An air conditioner, comprising:
the power supply module set of claim 9 and a power consumption module set connected to the filter circuit in the power supply module set;
and the power supply circuit of the power supply module supplies power to the power utilization module through the filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222639405.2U CN218276459U (en) | 2022-09-30 | 2022-09-30 | Filter circuit, power supply module and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222639405.2U CN218276459U (en) | 2022-09-30 | 2022-09-30 | Filter circuit, power supply module and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218276459U true CN218276459U (en) | 2023-01-10 |
Family
ID=84749877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222639405.2U Active CN218276459U (en) | 2022-09-30 | 2022-09-30 | Filter circuit, power supply module and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218276459U (en) |
-
2022
- 2022-09-30 CN CN202222639405.2U patent/CN218276459U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4667173A (en) | Line filter | |
| WO2013026221A1 (en) | Common mode choke apparatus and method | |
| US10498309B2 (en) | Common mode inductor apparatus having coil winding wound in multiple winding areas, and related winding method of common mode inductor apparatus and electromagnetic interference filter circuit | |
| CN209233717U (en) | A kind of EMC filter circuit | |
| CN213125842U (en) | EMI filter circuit based on switching power supply | |
| US4999594A (en) | AC line filter with tapped balun winding | |
| CN111478577A (en) | High-voltage direct-current power supply electromagnetic interference filter for vehicle motor controller | |
| CN203554278U (en) | A household electrical appliance and an EMI filter circuit thereof | |
| CN2482269Y (en) | Three-phase input filter unit for switch power supply | |
| CN218276459U (en) | Filter circuit, power supply module and air conditioner | |
| CN210041770U (en) | High-low frequency band filtering device and electrical equipment | |
| CN115149515A (en) | Low-voltage power supply filter circuit and motor controller | |
| CN110729978A (en) | High-frequency common mode rejection circuit and electrical apparatus | |
| CN217935443U (en) | Filtering device and microwave oven | |
| CN209374246U (en) | A kind of inductor, filter circuit and functional circuit | |
| CN115360897A (en) | Airborne DC-DC filtering current suppression device | |
| CN114977774A (en) | Drive circuit with EMI restraines and car motor drive system | |
| CN209692718U (en) | Filter device and electric apparatus | |
| CN210093187U (en) | High-frequency-band filtering device and electrical equipment | |
| CN107069730A (en) | High current is without magnetic core EMC wave filters | |
| CN210838954U (en) | Harmonic current suppression circuit | |
| CN217037045U (en) | High-power supply filter | |
| CN110601516A (en) | Filtering device, power supply and filtering method thereof | |
| CN218850623U (en) | Conducted interference suppression circuit based on unbalanced circuit | |
| CN217824765U (en) | Output filter for use in a gradient power amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |