CN212811562U - Frequency converter EMC circuit - Google Patents
Frequency converter EMC circuit Download PDFInfo
- Publication number
- CN212811562U CN212811562U CN202120171776.5U CN202120171776U CN212811562U CN 212811562 U CN212811562 U CN 212811562U CN 202120171776 U CN202120171776 U CN 202120171776U CN 212811562 U CN212811562 U CN 212811562U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- circuit
- mode circuit
- frequency converter
- power supply
- 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
- Noise Elimination (AREA)
Abstract
The utility model provides a converter EMC circuit relates to power electronics's technical field, include: a differential mode circuit and a common mode circuit; one end of the differential mode circuit is connected with one end of the common mode circuit, the other end of the differential mode circuit is respectively connected with three live wires in the three-phase power supply, and the other end of the common mode circuit is grounded; wherein, the three-phase power supply is connected with the frequency converter; the differential mode circuit and the common mode circuit act together to suppress high-frequency interference; the high-frequency interference is generated in the process that the three-phase power supply provides power supply input for the frequency converter. Through the utility model discloses well interconnect's differential mode circuit and common mode circuit can restrain the high frequency interference that three phase current produced, and then guarantees the normal work of equipment, has prolonged the life-span of equipment.
Description
Technical Field
The utility model belongs to the technical field of the power electronic technology and specifically relates to a converter EMC circuit is related to.
Background
Because the application field of the power electronic equipment (especially the frequency converter) is particularly complex, the power input distortion of the power electronic equipment is serious, high-frequency harmonic interference is easy to generate, the normal work of the equipment is seriously influenced, and even the equipment is damaged. The existing EMC structure is complex, only partial problems can be solved, but when the power distortion is serious, the normal operation of the equipment can not be ensured, so that the equipment is easy to damage, and the service life of the equipment is influenced. Therefore, a new solution is urgently needed to overcome the above technical problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a converter EMC (Electromagnetic Compatibility) circuit to the power input distortion that exists is more serious among the alleviating prior art, produces high frequency interference easily, has seriously influenced the normal work of equipment, can cause the technical problem of equipment damage even.
The utility model provides a pair of converter EMC circuit, wherein, include: a differential mode circuit and a common mode circuit; one end of the differential mode circuit is connected with one end of the common mode circuit, the other end of the differential mode circuit is respectively connected with three live wires in a three-phase power supply, and the other end of the common mode circuit is grounded; the three-phase power supply is connected with the frequency converter; the differential mode circuit and the common mode circuit act together to suppress high-frequency interference; the high-frequency interference is generated in the process that the three-phase power supply provides power supply input for the frequency converter.
Further, the differential mode circuit includes: the first capacitor is connected with a first live wire in the three-phase power supply, the second capacitor is connected with a second live wire in the three-phase power supply, and the third capacitor is connected with a third live wire in the three-phase power supply; the other end of the first capacitor and the other end of the third capacitor are connected with the other end of the second capacitor.
Further, the common mode circuit includes: a fourth capacitor and/or diode; one end of the fourth capacitor is connected with the midpoint of the first capacitor and the second capacitor, and the other end of the fourth capacitor is grounded; one end of the diode is connected with the middle point of the second capacitor and the third capacitor, and the other end of the diode is grounded.
Further, the diode is a discharge diode.
Further, the differential mode circuit is configured to construct a differential mode loop, where the first capacitor, the second capacitor, and the third capacitor form the differential mode loop.
Further, the differential mode circuit and the common mode circuit are used for jointly constructing a first common mode loop and/or a second common mode loop; wherein the first common-mode loop comprises: a first line formed by the first capacitor and the fourth capacitor, a second line formed by the second capacitor and the fourth capacitor, and a third line formed by the third capacitor and the fourth capacitor; the second common mode loop comprises: the first capacitor and the discharge diode form a fourth circuit, the second capacitor and the discharge diode form a fifth circuit, and the third capacitor and the discharge diode form a sixth circuit.
Furthermore, the model of the first capacitor, the model of the second capacitor and the model of the third capacitor are all equal.
Furthermore, the model of the fourth capacitor is not equal to the model of the first capacitor.
Further, the capacitance value of the fourth capacitor is not equal to the capacitance value of the first capacitor.
The utility model provides a pair of converter EMC circuit, include: a differential mode circuit and a common mode circuit; one end of the differential mode circuit is connected with one end of the common mode circuit, the other end of the differential mode circuit is respectively connected with three live wires in the three-phase power supply, and the other end of the common mode circuit is grounded; wherein, the three-phase power supply is connected with the frequency converter; the differential mode circuit and the common mode circuit act together to suppress high-frequency interference; the high-frequency interference is generated in the process that the three-phase power supply provides power supply input for the frequency converter. Through the utility model discloses well interconnect's differential mode circuit and common mode circuit can restrain the high frequency interference that three phase current produced, and then guarantees the normal work of equipment, has prolonged the life-span of equipment.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an EMC circuit of a frequency converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another frequency converter EMC circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a differential mode loop according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first common mode loop according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second common mode loop according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a connection mode between an EMC circuit and a frequency converter provided by an embodiment of the present invention.
Icon:
10-differential mode circuitry; 20-common mode circuitry; 100-frequency converter EMC circuit; 200-frequency converter.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Because the normal operation of equipment can not be guaranteed to current EMC when the power distortion is serious very much to cause the damage of equipment easily, and influence the life-span of equipment. Based on this, the embodiment of the utility model provides a converter EMC circuit through the differential mode circuit and the common mode circuit of interconnect, can restrain the high frequency interference that three phase current produced, and then guarantees the normal work of equipment, has prolonged the life-span of equipment. The frequency converter EMC circuit can be applied to the field of power electronic frequency converters, particularly the field of environments with severe electromagnetic compatibility environments.
In order to facilitate understanding of the present embodiment, a detailed description is first given of an EMC circuit of a frequency converter disclosed in an embodiment of the present invention.
Referring to fig. 1, the embodiment of the utility model provides a frequency converter EMC circuit, include: a differential mode circuit 10 and a common mode circuit 20;
one end of the differential mode circuit 10 is connected with one end of the common mode circuit 20, the other end of the differential mode circuit 10 is respectively connected with three live wires in a three-phase power supply, and the other end of the common mode circuit 20 is grounded (PE in fig. 1); wherein, the three-phase power supply is connected with the frequency converter; the symbols R, S and T in fig. 1 are used to represent the three live wires of a three-phase power supply. It should be noted that the frequency converter in this embodiment may be replaced by any other power electronic device. In this embodiment, the number of the differential mode circuits and the common mode circuits is not particularly limited.
The differential mode circuit 10 and the common mode circuit 20 work together to suppress high-frequency interference; the high-frequency interference is generated in the process that the three-phase power supply provides power supply input for the frequency converter.
The utility model provides a pair of converter EMC circuit, include: a differential mode circuit and a common mode circuit; one end of the differential mode circuit is connected with one end of the common mode circuit, the other end of the differential mode circuit is respectively connected with three live wires in the three-phase power supply, and the other end of the common mode circuit is grounded; wherein, the three-phase power supply is connected with the frequency converter; the differential mode circuit and the common mode circuit act together to suppress high-frequency interference; the high-frequency interference is generated in the process that the three-phase power supply provides power supply input for the frequency converter. Through the utility model discloses well interconnect's differential mode circuit and common mode circuit can restrain the high frequency interference that three phase current produced, and then guarantee the normal work of converter, have prolonged the life-span of converter.
Referring to fig. 2 and 3, the symbols R, S and T are again used to represent the three hot wires of the three-phase power supply. In an alternative embodiment, the differential mode circuit comprises: a first capacitor (i.e., C1 in fig. 2) connected to a first hot conductor (i.e., T in fig. 2) of the three-phase power supply, a second capacitor (i.e., C2 in fig. 2) connected to a second hot conductor (i.e., S in fig. 2) of the three-phase power supply, and a third capacitor (i.e., C3 in fig. 2) connected to a third hot conductor (i.e., R in fig. 2) of the three-phase power supply; referring to fig. 2 and 3, the other end of the first capacitor and the other end of the third capacitor are both connected to the other end of the second capacitor. In an alternative embodiment, the type of the first capacitor, the type of the second capacitor, and the type of the third capacitor are all equal. In addition, the three capacitors may have different types, and this embodiment is not particularly limited to this.
In an alternative embodiment, referring to fig. 2, 4 and 5, the common mode circuit comprises: a fourth capacitor (i.e., C4 in fig. 2) and/or a diode; one end of the fourth capacitor is connected with the midpoint of the first capacitor and the second capacitor, and the other end of the fourth capacitor is grounded; one end of the diode is connected with the middle points of the second capacitor and the third capacitor, and the other end of the diode is grounded. It should be noted that the type of the fourth capacitor is not equal to the type of the first capacitor. In an alternative embodiment, the diode is a discharge diode (i.e., D1 in fig. 2).
In an alternative embodiment, referring to fig. 3, the differential mode circuit is configured to construct a differential mode loop, wherein the first capacitor, the second capacitor and the third capacitor form the differential mode loop.
In an alternative embodiment, the differential mode circuit and the common mode circuit are used for jointly constructing a first common mode loop and/or a second common mode loop; referring to fig. 4, the first common mode loop includes: the first circuit is composed of a first capacitor and a fourth capacitor, the second circuit is composed of a second capacitor and a fourth capacitor, and the third circuit is composed of a third capacitor and a fourth capacitor; referring to fig. 5, the second common mode loop includes: the first capacitor and the discharge diode form a fourth circuit, the second capacitor and the discharge diode form a fifth circuit, and the third capacitor and the discharge diode form a sixth circuit.
Referring to fig. 2, the embodiment of the present invention provides another frequency converter EMC circuit, which is composed of capacitors C1, C2, and C3 of X type (capacitance value is 1 uF), capacitor C4 of Y type (capacitance value is 470 pF), and discharge diode D1. The utility model provides a this converter EMC circuit both includes the differential mode return circuit, includes two common mode return circuits again. Since the high-frequency interference includes differential mode interference and common mode interference, the present embodiment can suppress the differential mode interference through the differential mode loop, and can suppress the common mode interference through the two common mode loops.
The utility model provides a converter EMC circuit includes a plurality of electric capacity C1, C2, C3, C4 and discharge diode D1. The first loop is a differential mode loop consisting of C1, C2 and C3, the second loop is a first common mode loop consisting of three lines of C1, C4, C2, C4, C3 and C4, and the third loop is a second common mode loop consisting of three lines of C1, D1, C2, D1, C3 and D1. Generally, when the high-frequency interference of the power input is relatively serious or the distortion of the power input is serious, the circuits consisting of the C1, the C2, the C3 and the C4 work together, so that the common-mode interference can be suppressed while the differential-mode interference is suppressed.
Referring to fig. 6, the following connection relationship can be seen: the inverter EMC circuit 100 described in embodiment 1 is connected to a three-phase power supply, and the inverter 200 is also connected to the three-phase power supply.
After the frequency converter EMC circuit 100 suppresses the high-frequency interference generated by the three-phase power supply, in order to check the suppression effect, the power input of the frequency converter 200 may be detected by an oscilloscope.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process described above may refer to the corresponding process of the frequency converter EMC circuit 100, and will not be described herein again.
Claims (9)
1. Frequency converter EMC circuit, characterized in that it comprises: a differential mode circuit and a common mode circuit;
one end of the differential mode circuit is connected with one end of the common mode circuit, the other end of the differential mode circuit is respectively connected with three live wires in a three-phase power supply, and the other end of the common mode circuit is grounded; the three-phase power supply is connected with the frequency converter;
the differential mode circuit and the common mode circuit act together to suppress high-frequency interference; the high-frequency interference is generated in the process that the three-phase power supply provides power supply input for the frequency converter.
2. Frequency converter EMC circuit according to claim 1, characterized in that the differential mode circuit comprises: the first capacitor is connected with a first live wire in the three-phase power supply, the second capacitor is connected with a second live wire in the three-phase power supply, and the third capacitor is connected with a third live wire in the three-phase power supply;
the other end of the first capacitor and the other end of the third capacitor are connected with the other end of the second capacitor.
3. Frequency converter EMC circuit according to claim 2, characterized in that the common-mode circuit comprises: a fourth capacitor and/or diode;
one end of the fourth capacitor is connected with the midpoint of the first capacitor and the second capacitor, and the other end of the fourth capacitor is grounded;
one end of the diode is connected with the middle point of the second capacitor and the third capacitor, and the other end of the diode is grounded.
4. Frequency converter EMC circuit according to claim 3, characterized in that the diode is a discharge diode.
5. Frequency converter EMC circuit according to claim 2, characterized in that the differential mode circuit is arranged to build a differential mode loop, wherein the first, second and third capacitances constitute the differential mode loop.
6. Frequency converter EMC circuit according to claim 4, characterized in that the differential-mode circuit and the common-mode circuit together constitute a first common-mode loop and/or a second common-mode loop; wherein the first common-mode loop comprises: a first line formed by the first capacitor and the fourth capacitor, a second line formed by the second capacitor and the fourth capacitor, and a third line formed by the third capacitor and the fourth capacitor; the second common mode loop comprises: the first capacitor and the discharge diode form a fourth circuit, the second capacitor and the discharge diode form a fifth circuit, and the third capacitor and the discharge diode form a sixth circuit.
7. Frequency converter EMC circuit according to claim 2, characterized in that the type of said first capacitance, the type of said second capacitance and the type of said third capacitance are all equal.
8. Frequency converter EMC circuit according to claim 3, characterized in that the model of said fourth capacitance is not equal to the model of said first capacitance.
9. Frequency converter EMC circuit according to claim 3, characterized in that the capacitance value of said fourth capacitance is not equal to the capacitance value of said first capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120171776.5U CN212811562U (en) | 2021-01-22 | 2021-01-22 | Frequency converter EMC circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120171776.5U CN212811562U (en) | 2021-01-22 | 2021-01-22 | Frequency converter EMC circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212811562U true CN212811562U (en) | 2021-03-26 |
Family
ID=75087432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120171776.5U Active CN212811562U (en) | 2021-01-22 | 2021-01-22 | Frequency converter EMC circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212811562U (en) |
-
2021
- 2021-01-22 CN CN202120171776.5U patent/CN212811562U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9455646B2 (en) | Filter device, power converter and common mode noise suppression method | |
| EP3255770B1 (en) | Filter and power supply system | |
| US9887641B2 (en) | Power converter | |
| CN100530891C (en) | Sampling circuit for three-level power factor correction circuit and voltage sampling method thereof | |
| CN112019039A (en) | Power interface circuit with high-grade surge protection and high EMI performance | |
| EP3291453B1 (en) | Power carrier signal coupling circuit and communication system | |
| JP2010288381A (en) | Noise reduction circuit of power conversion equipment | |
| CN212811562U (en) | Frequency converter EMC circuit | |
| CN109450236A (en) | A kind of EMI damping filter circuit and filtering method | |
| CN214674885U (en) | EMI filter circuit and system | |
| CN204349789U (en) | AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus | |
| CN107689734B (en) | High power conversion system | |
| CN208571933U (en) | A kind of frequency converter that refrigerator uses | |
| CN113258800B (en) | Bidirectional power supply equipment, power supply control method and device | |
| CN2476134Y (en) | On-off power supply single phase input filter | |
| US2308013A (en) | Filter circuit | |
| CN209184476U (en) | A kind of EMI damping filter circuit | |
| CN214959276U (en) | Power supply circuit with low ripple noise input and output | |
| CN209896905U (en) | Interference pulse suppression circuit | |
| CN100365903C (en) | Single-phase AC inputting electromagnetic interference killer circuit | |
| CN101005275A (en) | Clock generator circuit | |
| CN217445240U (en) | High-frequency suppression frequency converter | |
| CN101232274A (en) | Filter circuit for reducing differential signal electromagnetic interference | |
| CN220156498U (en) | Elevator EMI power filter circuit | |
| CN210157082U (en) | Control circuit, circuit board and electrical apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |