CN117639482A - Common mode noise reduction circuit - Google Patents
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- CN117639482A CN117639482A CN202311590691.0A CN202311590691A CN117639482A CN 117639482 A CN117639482 A CN 117639482A CN 202311590691 A CN202311590691 A CN 202311590691A CN 117639482 A CN117639482 A CN 117639482A
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Abstract
The invention discloses a common mode noise reduction circuit which comprises a three-phase alternating current power supply port, a first filter circuit, a conversion circuit, a second filter circuit and a direct current side which are sequentially connected, wherein the second filter circuit comprises a first capacitor and a second capacitor which are electrically connected, the positive electrode of the first capacitor is connected with the positive electrode of the direct current side, the negative electrode of the first capacitor is connected with the positive electrode of the second capacitor, the negative electrode of the second capacitor is connected with the negative electrode of the direct current side, the connection point of the first capacitor and the second capacitor is a first connection point, the first filter circuit comprises three alternating current side capacitors and three alternating current side inductors, one ends of the three alternating current side capacitors are connected with the three-phase alternating current power supply port and one ends of the three alternating current side inductors, and the other ends of the three alternating current side capacitors are connected to the first connection point. The invention can inhibit high-frequency voltage ripple and effectively reduce common mode noise.
Description
Technical Field
The invention relates to the technical field of three-phase bidirectional ACDC conversion, in particular to a common mode noise reduction circuit.
Background
With the aggravation of energy crisis and environmental pollution, renewable energy power generation is receiving more and more attention. However, renewable energy sources are greatly affected by natural conditions, and power generation systems thereof have voltage and power instabilities. In order to solve the problem of power fluctuation, a system is generally connected with a large power grid to form a micro-grid, wherein the 380V direct-current micro-grid becomes a hot spot due to the advantages of less power conversion links and higher efficiency and reliability. In a 380V DC micro-grid, a bi-directional interface converter is required between the grid and the DC bus to achieve energy transfer between the system and the grid, a three-phase bi-directional AC/DC converter is often required in high power applications,
the three-phase bidirectional AC/DC converter usually adopts a three-phase voltage type pulse width modulation (pulse width modulation, PWM) rectifier, the input current of the converter is continuous, the power factor of the network side is higher, but the output is in a boosting characteristic, the output voltage of the three-phase 380V AC input voltage after the three-phase 380V AC input voltage is converted is 600-800V, and the converter does not realize electrical isolation. The traditional three-phase three-wire switch circuit topology structure can generate a high-frequency ripple voltage Vo-at the negative end of the direct-current output, so that high-frequency common-mode noise is generated.
Disclosure of Invention
The invention mainly aims to provide a common mode noise reduction circuit which aims to reduce common mode noise of output voltage.
In order to achieve the above objective, the present invention provides a common mode noise reduction circuit, which comprises a three-phase ac power port, a first filter circuit, a conversion circuit, a second filter circuit, and a dc side, wherein the three-phase ac power port, the first filter circuit, the conversion circuit, the second filter circuit, and the dc side are sequentially connected, the second filter circuit comprises a first capacitor and a second capacitor that are electrically connected, the positive electrode of the first capacitor is connected with the positive electrode of the dc side, the negative electrode of the first capacitor is connected with the positive electrode of the second capacitor, the negative electrode of the second capacitor is connected with the negative electrode of the dc side, the point at which the first capacitor is connected with the second capacitor is a first connection point, the first filter circuit comprises three ac side capacitors and three ac side inductors, one ends of the three ac side capacitors are connected with the three-phase ac power port and one ends of the three ac side inductors, and the other ends of the three ac side capacitors are connected to the first connection point.
In an embodiment, the common mode noise reduction circuit further includes a three-phase rectifier bridge, a second connection point is disposed on the three-phase rectifier bridge, and the three-phase rectifier bridge is connected with the three-phase ac power port and the first filter circuit through the second connection point.
In an embodiment, the three-phase rectifier bridge includes a common cathode group and a common anode group, wherein an anode of the common cathode group is connected with a cathode of the common anode group, a cathode of the common cathode group is connected with a conversion circuit and a direct current side positive electrode, and an anode of the common anode group is connected with the conversion circuit and a direct current side negative electrode.
In an embodiment, the conversion circuit is a three-phase full-bridge circuit or a three-level full-bridge circuit.
In an embodiment, the three-phase full-bridge circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube; the source electrode of the first switching tube is connected with the drain electrode of the second switching tube to form a first bridge arm, the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube to form a second bridge arm, the source electrode of the fifth switching tube is connected with the drain electrode of the sixth switching tube to form a third bridge arm, and the drain electrodes of the first switching tube, the third switching tube and the fifth switching tube are connected with a first node; and the sources of the second switching tube, the fourth switching tube and the sixth switching tube are connected with a second node.
In an embodiment, the three-level full-bridge circuit is provided with a third connection point, the third connection point is connected with the first connection point, and the other ends of the three ac-side capacitors are connected with the first connection point through the three-level full-bridge circuit.
In one embodiment, the three-level full bridge circuit includes: the switching device comprises a first switching circuit, a second switching circuit and a third switching circuit, wherein a drain end, a source end and a connecting point end are arranged on the first switching circuit, the second switching circuit and the third switching circuit, the drain ends of the first switching circuit, the second switching circuit and the third switching circuit are connected with a direct current side positive electrode, the source ends of the first switching circuit, the second switching circuit and the third switching circuit are connected with a direct current side negative electrode, and the connecting point ends of the first switching circuit, the second switching circuit and the third switching circuit are connected with a first connecting point.
In an embodiment, the first switching circuit includes a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a first diode and a second diode, a source electrode of the first switching tube and a drain electrode of the second switching tube are connected to the same third node, a source electrode of the second switching tube and a drain electrode of the third switching tube are connected to the same fourth node, a source electrode of the third switching tube and a drain electrode of the fourth switching tube are connected to the same fifth node, a cathode of the first diode is connected to the third node, an anode of the first diode is connected to a cathode of the second diode, and an anode of the second diode is connected to the fifth node.
In an embodiment, the three ac side inductances include a first inductance, and the first inductance is connected to the fourth node.
In an embodiment, the three ac side inductors further include a second inductor and a third inductor, and the first inductor, the second inductor and the third inductor are connected in parallel.
According to the invention, three alternating-current side capacitors in the first filter circuit are connected with the first connection points of the first capacitor and the second capacitor, alternating current flows in from a three-phase alternating-current power supply port, and after being output through the first filter circuit, the conversion circuit and the second filter circuit, high-frequency voltage ripple is restrained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit diagram of a first embodiment of a common mode noise reduction circuit;
FIG. 2 is a circuit diagram of a second embodiment of a common mode noise reduction circuit;
FIG. 3 is a circuit diagram of a third embodiment of a common mode noise reduction circuit;
FIG. 4 is a circuit diagram of a fourth embodiment of a common mode noise reduction circuit;
fig. 5 is a diagram showing simulation results of voltage values at the first connection point of the output capacitor in the first embodiment.
Reference numerals illustrate:
1-first filter circuit, 2-three-phase full bridge circuit, 3-second filter circuit, 4-three-phase rectifier bridge, 5-three level full bridge circuit, 6-common cathode group, 7-common anode group, 8-first switch circuit, 9-second switch circuit, 10-third switch circuit, 11-three-phase alternating current power supply port, 12-direct current side.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The utility model provides a common mode noise reduction circuit, includes three-phase alternating current power port 11, first filter circuit 1, converting circuit, second filter circuit 3, direct current side 12 that connect gradually, first filter circuit 1, three-phase full bridge circuit 2, second filter circuit 3 are the series connection, second filter circuit 3 includes first electric capacity C1 and the second electric capacity C2 of electricity connection, the positive pole of first electric capacity C1 is connected with direct current side 12 positive pole, the negative pole of first electric capacity C1 with the positive pole of second electric capacity C2 is connected, the negative pole of second electric capacity C2 is connected with direct current side 12 negative pole, first electric capacity C1 with the tie point of second electric capacity C2 is first tie point J, first filter circuit 1 includes three alternating current side electric capacity, three alternating current side inductance, the one end of three alternating current side electric capacity is connected with three phase alternating current power port 11, the one end of three alternating current side inductance, the other end of three alternating current side electric capacity is connected to first tie point J.
The three-phase rectifier bridge 4 comprises a common cathode group 6 and a common anode group 7, wherein the anode of the common cathode group 6 is connected with the cathode of the common anode group 7, the cathode of the common cathode group 6 is connected with the positive electrode of the three-level full-bridge circuit 5 and the positive electrode of the direct current side 12, and the anode of the common anode group 7 is connected with the negative electrode of the three-phase full-bridge circuit 2 and the negative electrode of the direct current side 12. The three-level full bridge circuit 5 includes: the first switch circuit 8, the second switch circuit 9 and the third switch circuit 10, the first switch circuit 8, the second switch circuit 9 and the third switch circuit 10 are all provided with a drain terminal, a source terminal and a connection point terminal, the drain terminals of the first switch circuit 8, the second switch circuit 9 and the third switch circuit 10 are all connected with the positive electrode of the direct current side 12, the source terminals of the first switch circuit 8, the second switch circuit 9 and the third switch circuit 10 are all connected with the negative electrode of the direct current side 12, and the connection point terminals of the first switch circuit 8, the second switch circuit 9 and the third switch circuit 10 are all connected with the first connection point J.
Unipolar binary logic switching function
V 0 -＝-V 0 *∑(s a +s b +s c ),
Wherein V is 0 -is the output voltage, s a Is a switching function of A phase, s b Is a switching function of B phase, s c Switching function of C phase, V 0 Is the voltage across the dc side 12;
when s is a ＝s b ＝s c When=0 (upper bridge is off and lower bridge is on), vo- =0;
as shown in fig. 5, the ea curve represents the a-phase dc network voltage, the eb curve represents the B-phase dc network voltage, the ec curve represents the C-phase dc network voltage, the C6-N curve represents the output capacitor junction voltage Vo0, and at any time, there is always a phase voltage less than 0, and at this time, the negative output voltage Vo-is shorted to the phase voltage that is negative. However, in this embodiment, the three ac side capacitors in the first filter circuit 1 are connected to the first connection point J of the first capacitor C1 and the second capacitor C2, and the three-phase rectifier bridge 4 is added to prevent overstressing of the switching tube caused by abrupt change of the input current.
The three-phase rectifier bridge 4 comprises a common cathode group 6 and a common anode group 7, wherein the anode of the common cathode group 6 is connected with the cathode of the common anode group 7, the cathode of the common cathode group 6 is connected with a conversion circuit and the anode of a direct current side 12, the anode of the common anode group 7 is connected with the cathode of the conversion circuit and the anode of the direct current side 12, and the three-phase rectifier bridge 4 converts alternating current input by a three-phase alternating current power supply port 11 into direct current. The three-phase rectifier bridge 4 is composed of six diodes, each diode serves as a switch, and through proper control, the negative half-cycle part of the alternating current signal can be conducted through the conducting state of the diode, and the positive half-cycle part is cut off through the cut-off state of the diode, so that the conversion from alternating current to direct current is realized.
The conversion circuit is a three-phase full-bridge circuit 2 or a three-level full-bridge circuit 5.
Example 1
As shown in fig. 1, the present invention proposes a common mode noise reduction circuit in a three-phase three-wire switching circuit, which includes a three-phase ac power port 11, a first filter circuit 1, a three-phase full-bridge circuit 2, a second filter circuit 3, and a dc side 12 that are sequentially connected, where the first filter circuit 1, the three-phase full-bridge circuit 2, and the second filter circuit 3 are connected in series, the second filter circuit 3 includes a first capacitor C1 and a second capacitor C2 that are electrically connected, an anode of the first capacitor C1 is connected to an anode of the dc side 12, a cathode of the first capacitor C1 is connected to an anode of the second capacitor C2, a connection point of the first capacitor C1 and the second capacitor C2 is a first connection point J, the first filter circuit 1 includes three ac side capacitors, three ac side inductors, one ends of the three ac side capacitors are connected to one ends of the three-phase ac power port 11 and the three ac side inductors, and the other ends of the three ac side inductors are connected to the first connection point J.
In the embodiment of the invention, as shown in fig. 1, the other ends of three ac side capacitors in the common mode noise reduction circuit are connected to the first connection point J to eliminate the level bit, and after the ac flows in from the three-phase ac power port 11 and is output by the first filter circuit 1, the three-phase full bridge circuit 2 and the second filter circuit 3, the high frequency voltage ripple is suppressed, the common mode noise of the output voltage is reduced, and the input side is added with a multi-stage ac side inductor to eliminate the common mode noise interference to the power grid.
In an embodiment, the three-phase full-bridge circuit 2 includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5, and a sixth switching tube Q6; the source electrode of the first switching tube Q1 is connected with the drain electrode of the second switching tube Q2 to form a first bridge arm, the source electrode of the third switching tube Q3 is connected with the drain electrode of the fourth switching tube Q4 to form a second bridge arm, the source electrode of the fifth switching tube Q5 is connected with the drain electrode of the sixth switching tube Q6 to form a third bridge arm, and the drain electrodes of the first switching tube Q1, the third switching tube Q3 and the fifth switching tube Q5 are connected to a first node D; the sources of the second switching tube Q2, the fourth switching tube Q4 and the sixth switching tube Q6 are connected to a second node E, the first node D is connected with the positive electrode of the direct current side 12, and the second node E is connected with the negative electrode of the direct current side 12.
Example two
As shown in fig. 2, the second embodiment is identical to the first embodiment except that the common mode noise reduction circuit further includes a three-phase rectifier bridge 4, a second connection point K is disposed on the three-phase rectifier bridge 4, and the three-phase rectifier bridge 4 is connected with the three-phase ac power port 11 and the first filter circuit 1 through the second connection point K.
The three-phase rectifier bridge 4 is added to the three-phase alternating current power port 11, so that the influence of high-frequency jump of the negative output voltage Vo-can be prevented, the influence of input voltage fluctuation on a switching tube in the three-phase full-bridge circuit 2 is prevented, and the reliability of the bidirectional ACDC conversion circuit is improved.
Example III
As shown in fig. 3, the present invention further provides a common mode noise reduction circuit in a three-phase three-wire I-type three-level circuit, and the common mode noise reduction circuit adopts all the technical solutions of all the above embodiments, so that the present invention at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail herein. The common-mode noise reduction circuit comprises a three-phase alternating current power supply port 11, a first filter circuit 1, a three-phase full-bridge circuit 2, a second filter circuit 3 and a direct current side 12 which are sequentially connected, the second filter circuit 3 comprises a first capacitor C1 and a second capacitor C2 which are electrically connected, the positive electrode of the first capacitor C1 is connected with the positive electrode of the direct current side 12, the negative electrode of the first capacitor C1 is connected with the positive electrode of the second capacitor C2, the negative electrode of the second capacitor C2 is connected with the negative electrode of the direct current side 12, the connection point of the first capacitor C1 and the second capacitor C2 is a first connection point J, the three bridge arm connection points of the three-level full-bridge circuit 5 are connected with the first connection point J, the first filter circuit 1 comprises three alternating current side capacitors and three alternating current side inductors, one ends of the three alternating current side capacitors are connected with one ends of the three alternating current power supply port 11 and the three alternating current side inductors, the three level full-bridge circuit is provided with a third connection point M, the third connection point M is connected with the third connection point J, and the other end of the three level full-bridge circuit is connected with the third connection point J through the three full-bridge circuit connection point J.
Example IV
As shown in fig. 4, the fourth embodiment is identical to the third embodiment, and is different in that the common-mode noise reduction circuit further includes a three-phase rectifier bridge 4, a second connection point K is disposed on the three-phase rectifier bridge 4, the three-phase rectifier bridge 4 is connected with the three-phase ac power port 11 and the first filter circuit 1 through the second connection point K, the addition of the three-phase rectifier bridge 4 solves the impact on the switching tube of the inverter when the power grid fluctuates, the addition of the three-phase rectifier bridge 4 to the three-phase ac power port 11 can prevent the negative output voltage Vo-from having the influence of high-frequency jump, prevent the input voltage fluctuation from having the influence on the switching tube in the three-phase full-bridge circuit 2, and prevent the transient high current from flowing through the switching tube when the input voltage suddenly changes, thereby reducing the current stress of the switching tube and improving the reliability of the bidirectional ACDC conversion circuit.
The first switching circuit 8 includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a first diode D1 and a second diode D2, where a source of the first switching tube Q1 and a drain of the second switching tube Q2 are connected to the same third node F, a source of the second switching tube Q2 and a drain of the third switching tube Q3 are connected to the same fourth node G, a source of the third switching tube Q3 and a drain of the fourth switching tube Q4 are connected to the same fifth node H, a cathode of the first diode D1 is connected to the third node F, an anode of the first diode D1 is connected to a cathode of the second diode D2, an anode of the second diode D2 is connected to the fifth node H, and in this embodiment, the compositions of the first switching circuit 8 are not listed, and the compositions of the second switching circuit 9, the third switching circuit 10 and the first switching circuit 8 are not identical; the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4 are N-type MOS tubes (N-type metal oxide semiconductor field effect tubes) that can control the on and off states of the channels by controlling the gate voltage. When the grid voltage is higher than the critical voltage, the channel of the N-type MOS tube is conductive and allows current to pass through; when the gate voltage is below the threshold voltage, the channel is turned off, preventing current from passing.
In an embodiment, the three ac side inductors include a first inductor L3, the first inductor L3 is connected to the fourth node G, the three ac side inductors further include a second inductor L2 and a third inductor L1, and the first inductor L3, the second inductor L2 and the third inductor L1 are connected in parallel. The connection manner of the second inductor L2 and the second switch circuit 9, and the connection manner of the third inductor L1 and the third switch circuit 10 are the same as the connection manner of the first inductor L3 and the first switch circuit 8, and are not described in detail herein.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The utility model provides a common mode noise reduction circuit, its characterized in that, including three-phase alternating current power port, first filter circuit, converting circuit, second filter circuit, direct current side that connect gradually, second filter circuit includes first electric capacity and the second electric capacity of electricity connection, the anodal of first electric capacity is connected with the direct current side anodal, the negative pole of first electric capacity with the anodal of second electric capacity is connected, the negative pole of second electric capacity is connected with the direct current side negative pole, the first electric capacity with the point that the second electric capacity is connected is first connecting point, first filter circuit includes three alternating current side electric capacity, three alternating current side inductance, the one end of three alternating current side electric capacity is connected with three-phase alternating current power port, three alternating current side inductance's one end, the other end of three alternating current side electric capacity is connected to first connecting point.
2. The common mode noise reduction circuit of claim 1, further comprising a three-phase rectifier bridge, wherein a second connection point is provided on the three-phase rectifier bridge, and wherein the three-phase rectifier bridge is connected to the three-phase ac power supply port and the first filter circuit through the second connection point.
3. The common mode noise reduction circuit of claim 1, wherein the three-phase rectifier bridge comprises a common cathode group and a common anode group, wherein an anode of the common cathode group is connected with a cathode of the common anode group, a cathode of the common cathode group is connected with a conversion circuit and a direct current side positive electrode, and an anode of the common anode group is connected with the conversion circuit and a direct current side negative electrode.
4. The common mode noise reduction circuit of claim 1, wherein the conversion circuit is a three-phase full-bridge circuit or a three-level full-bridge circuit.
5. The common mode noise reduction circuit of claim 4, wherein the three-phase full-bridge circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube; the source electrode of the first switching tube is connected with the drain electrode of the second switching tube to form a first bridge arm, the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube to form a second bridge arm, the source electrode of the fifth switching tube is connected with the drain electrode of the sixth switching tube to form a third bridge arm, and the drain electrodes of the first switching tube, the third switching tube and the fifth switching tube are connected with a first node; and the sources of the second switching tube, the fourth switching tube and the sixth switching tube are connected with a second node.
6. The common mode noise reduction circuit according to claim 4, wherein the three-level full-bridge circuit is provided with a third connection point, the third connection point being connected to the first connection point, and the other ends of the three ac-side capacitors being connected to the first connection point via the three-level full-bridge circuit.
7. The common mode noise reduction circuit of claim 4, wherein the three-level full bridge circuit comprises: the switching device comprises a first switching circuit, a second switching circuit and a third switching circuit, wherein a drain end, a source end and a connecting point end are arranged on the first switching circuit, the second switching circuit and the third switching circuit, the drain ends of the first switching circuit, the second switching circuit and the third switching circuit are connected with a direct current side positive electrode, the source ends of the first switching circuit, the second switching circuit and the third switching circuit are connected with a direct current side negative electrode, and the connecting point ends of the first switching circuit, the second switching circuit and the third switching circuit are connected with a first connecting point.
8. The common mode noise reduction circuit of claim 7, wherein the first switching circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a first diode, and a second diode, wherein a source of the first switching tube and a drain of the second switching tube are connected to a same third node, a source of the second switching tube and a drain of the third switching tube are connected to a same fourth node, a source of the third switching tube and a drain of the fourth switching tube are connected to a same fifth node, a cathode of the first diode is connected to the third node, an anode of the first diode is connected to a cathode of the second diode, and an anode of the second diode is connected to the fifth node.
9. The common mode noise reduction circuit of claim 8, wherein three of the ac side inductances include a first inductance, the first inductance being connected to the fourth node.
10. The common mode noise reduction circuit of claim 8, wherein the three ac side inductors further comprise a second inductor, a third inductor, the first inductor, the second inductor, and the third inductor being connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311590691.0A CN117639482A (en) | 2023-11-24 | 2023-11-24 | Common mode noise reduction circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311590691.0A CN117639482A (en) | 2023-11-24 | 2023-11-24 | Common mode noise reduction circuit |
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| CN117639482A true CN117639482A (en) | 2024-03-01 |
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| CN202311590691.0A Pending CN117639482A (en) | 2023-11-24 | 2023-11-24 | Common mode noise reduction circuit |
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| CN (1) | CN117639482A (en) |
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