CN113452241A - Common mode interference suppression device and frequency conversion electrical apparatus - Google Patents
Common mode interference suppression device and frequency conversion electrical apparatus Download PDFInfo
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- CN113452241A CN113452241A CN202110671801.0A CN202110671801A CN113452241A CN 113452241 A CN113452241 A CN 113452241A CN 202110671801 A CN202110671801 A CN 202110671801A CN 113452241 A CN113452241 A CN 113452241A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The embodiment of the invention provides a common mode interference suppression device and a variable frequency electric appliance, wherein the common mode interference suppression device comprises: the device comprises a live wire branch, a zero line branch, a ground wire branch, a first filter, a second filter and a third filter; one end of the live wire branch is connected with a live wire of an alternating current power supply, the other end of the live wire branch is connected with the load branch, and the live wire branch is provided with a first filter; one end of the zero line branch is connected with a zero line of an alternating current power supply, the other end of the zero line branch is connected with the load branch, and the zero line branch is provided with a second filter; one end of the ground wire branch is connected with the ground wire of the alternating current power supply, the other end of the ground wire branch is grounded, and the ground wire branch is provided with a third filter. Therefore, the common mode interference of the shell is prevented from being coupled to a power supply zero line and a power supply live line from a power supply ground wire through idle coupling between cables, the radiation interference of the power supply ground wire is avoided, the common mode interference suppression is carried out without increasing the filtering stage number and increasing the number of turns of the magnetic rings, and the filtering cost is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of circuits, in particular to a common-mode interference suppression device and a variable-frequency electric appliance.
Background
The high-power electric appliance has large working current, so that the generated interference current is also huge. There are many common mode interferences to ground, which results in common mode interferences in different frequency bands (e.g. 150KHz to 30 MHz). Common filters for suppressing common-mode interference are a common-mode capacitor (also called as a Y capacitor) and a common-mode inductor (also called as a common-mode choke), and most of these filters are used for conduction test (150KHz to 30MHz), and block and dredge interference current by way of main circuit resistance increasing and bypass current guiding.
At present, except for some devices which are connected with the casing in a protection mode, most common mode interference is bypassed through a Y capacitor of a filter circuit. However, the common mode interference of the enclosure is coupled from the power ground to the power zero line and the power line (low frequency) through idle coupling between the cables, which causes filtering failure, and even the power ground itself generates radiation interference (high frequency), which requires increasing the filtering stage number, increasing the number of turns of the magnetic ring, and performing common mode interference suppression, thereby further increasing the filtering cost.
Disclosure of Invention
In order to solve the technical problems that the common mode interference of the casing is coupled back to a zero line and a live line (low frequency) of a power supply through a ground wire of the power supply to cause filtering failure, and even the ground wire of the power supply generates radiation interference (high frequency), the filtering stage number is required to be increased, the number of turns of magnetic rings is increased, and the number of the magnetic rings is required to be suppressed, so that the filtering cost is further increased, the embodiment of the invention provides a common mode interference suppression device and a frequency conversion electric appliance.
In a first aspect of the embodiments of the present invention, there is provided a common mode interference suppression apparatus, including: the device comprises a live wire branch, a zero line branch, a ground wire branch, a first filter, a second filter and a third filter;
one end of the live wire branch is connected with a live wire of an alternating current power supply, the other end of the live wire branch is connected with a load branch, and the live wire branch is provided with the first filter;
one end of the zero line branch is connected with a zero line of the alternating current power supply, the other end of the zero line branch is connected with the load branch, and the zero line branch is provided with the second filter;
one end of the ground wire branch is connected with the ground wire of the alternating current power supply, the other end of the ground wire branch is grounded, and the third filter is arranged on the ground wire branch.
In an optional embodiment, the live line branch comprises a live line input terminal and a live line output terminal of the patch panel, one end of the live line input terminal is connected with a live line of an alternating current power supply, the other end of the live line input terminal is connected with one end of the live line output terminal, and the other end of the live line output terminal is connected with the load branch;
the first filter is arranged between the other end of the live wire output terminal and the load branch circuit, or the first filter is arranged between the other end of the live wire input terminal and one end of the live wire output terminal.
In an optional embodiment, the zero line branch includes a zero line input terminal and a zero line output terminal of a patch panel, one end of the zero line input terminal is connected to a zero line of the ac power supply, the other end of the zero line input terminal is connected to one end of the zero line output terminal, and the other end of the zero line output terminal is connected to the load branch;
the second filter is arranged between the other end of the zero line output terminal and the load branch circuit, or the second filter is arranged between the other end of the zero line input terminal and one end of the zero line output terminal.
In an alternative embodiment, the ground line branch includes a ground line input terminal and a ground line output terminal of the patch panel, one end of the ground line input terminal is connected to a ground line of the ac power supply, the other end of the ground line input terminal is connected to one end of the ground line output terminal, and the other end of the ground line output terminal is grounded;
the third filter is disposed between the other end of the ground line output terminal and the ground, or the third filter is disposed between the other end of the ground line input terminal and one end of the ground line output terminal.
In an optional embodiment, the common mode interference rejection apparatus further includes a communication branch, a fourth filter;
one end of the communication branch is connected with the communication line, the other end of the communication branch is connected with the communication load branch, and the communication branch is provided with the fourth filter.
In an optional embodiment, the communication branch comprises a communication input terminal and a communication output terminal of the patch panel, one end of the communication input terminal is connected with the communication line, the other end of the communication input terminal is connected with one end of the communication output terminal, and the other end of the communication output terminal is connected with the communication load branch;
the fourth filter is arranged between the other end of the communication output terminal and the communication load branch, or the fourth filter is arranged between the other end of the communication input terminal and one end of the communication output terminal.
In an optional embodiment, the first filter, the second filter, the third filter, and the fourth filter each include a magnetic loop, and the type of the magnetic loop includes a loop type or a snap type.
In an alternative embodiment, the third filter comprises one of: the resistor, the magnetic beads, and the resistor and the capacitor which are connected in series;
the other end of the ground wire output terminal is connected with one end of the third filter, and the other end of the third filter is grounded;
the other end of the ground input terminal is connected to one end of the third filter, and the other end of the third filter is connected to one end of the ground output terminal.
In an alternative embodiment, one end of the ground input terminal comprises a tab or alternatively, one end of the ground input terminal comprises a disc and fastening assembly.
In a second aspect of the embodiments of the present invention, there is provided a variable frequency electric appliance, including: the common mode interference rejection device of any one of the first aspect.
The common mode interference suppression device provided by the embodiment of the invention comprises a live wire branch, a zero line branch, a ground wire branch, a first filter, a second filter and a third filter, wherein one end of the live wire branch is connected with a live wire of an alternating current power supply, the other end of the live wire branch is connected with a load branch, the live wire branch is provided with the first filter, one end of the zero line branch is connected with a zero line of the alternating current power supply, the other end of the zero line branch is connected with the load branch, the zero line branch is provided with the second filter, one end of the ground wire branch is connected with a ground wire of the alternating current power supply, the other end of the ground wire branch is grounded, and the ground wire branch is provided with the third filter. Therefore, by adding the ground wire branch, one end of the ground wire branch is connected with the ground wire of the alternating current power supply, the other end of the ground wire branch is grounded, the ground wire branch is provided with the third filter, the casing common mode interference can be suppressed, the casing common mode interference is prevented from being coupled to a power supply zero line and a power line from the power supply ground wire through idle coupling among cables, the radiation interference of the power supply ground wire is avoided, the filtering stage number is not required to be increased, the number of turns of the magnetic ring is not required to be increased, the common mode interference suppression is carried out, and the filtering cost is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
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 description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a common mode interference rejection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another common mode interference rejection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another common mode interference rejection apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a power cord connection shown in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another common mode interference rejection apparatus according to an embodiment of the present invention;
fig. 6 is a left side view of a ground input terminal and a ground output terminal shown in the embodiment of the present invention;
fig. 7 is a left side view of the ground input terminal and the ground output terminal of another embodiment of the present invention;
fig. 8 is a schematic structural diagram of another common mode interference rejection apparatus according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another common mode interference rejection apparatus according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another common mode interference suppression apparatus according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another common mode interference suppression apparatus according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of another common mode interference rejection apparatus according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a variable frequency electrical appliance shown in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
At present, except for some devices which are connected with a casing in a protection mode, most common mode interference is bypassed through a Y capacitor of a filter circuit, so that the common mode interference suppression of the zero/live wire of the power supply is only considered in the current design, measures (such as a magnetic ring) are added on the zero/live wire of the power supply, and no measures are taken on the ground wire of the power supply, and the ground wire of the power supply is only effectively connected with the casing.
Because impedance exists between the casing and the real earth, when a large amount of electromagnetic interference exists on the casing, the electromagnetic interference can be coupled to a power supply zero line and a power supply live line (low frequency) from a power supply ground wire through idle coupling among cables, so that filtering is invalid, even the power supply ground wire generates radiation interference (high frequency), the filtering stages are required to be increased, the number of turns of the magnetic rings is increased, and common-mode interference suppression is carried out, so that the filtering cost is further increased.
Based on this, in order to reduce the filtering cost, as shown in fig. 1, a schematic structural diagram of a common mode interference suppression device provided in an embodiment of the present invention is shown, where the common mode interference suppression device includes: the device comprises a live wire branch, a zero wire branch, a ground wire branch, a first filter, a second filter and a third filter.
One end of the live wire branch is connected with a live wire of an alternating current power supply, the other end of the live wire branch is connected with the load branch, and the live wire branch is provided with a first filter; one end of the zero line branch is connected with a zero line of an alternating current power supply, the other end of the zero line branch is connected with the load branch, and the zero line branch is provided with a second filter; one end of the ground wire branch is connected with the ground wire of the alternating current power supply, the other end of the ground wire branch is grounded (here, the ground refers to a casing in an actual application scene), and the ground wire branch is provided with a third filter.
The first filter, the second filter and the third filter may include magnetic rings, the magnetic rings may be ring-shaped or snap-fit, the corresponding magnetic rings may be replaced according to the interference frequency band to be solved, the magnetic rings may wind the live wire/zero wire/ground wire into a suitable number of turns according to the actual impedance requirement, the best mode is that a single live wire/zero wire/ground wire passes through the magnetic rings, the magnetic rings are fixed by using a heat-shrinkable sleeve, and if the sliding influence of the magnetic rings is considered, wire ties may be added at both ends of the magnetic rings.
Therefore, by adding the ground wire branch, one end of the ground wire branch is connected with the ground wire of the alternating current power supply, the other end of the ground wire branch is grounded, the ground wire branch is provided with the third filter, the casing common mode interference can be suppressed, the casing common mode interference is prevented from being coupled to a power supply zero line and a power line from the power supply ground wire through idle coupling among cables, the radiation interference of the power supply ground wire is avoided, the filtering stage number is not required to be increased, the number of turns of the magnetic ring is not required to be increased, the common mode interference suppression is carried out, and the filtering cost is reduced. In addition, a first filter is arranged on the live wire branch, and a second filter is arranged on the zero line branch, so that the common mode interference of the power supply zero line/live wire can be inhibited.
As shown in fig. 2, a schematic structural diagram of another common mode interference rejection apparatus according to an embodiment of the present invention is provided, where the common mode interference rejection apparatus includes: the live wire branch circuit comprises a live wire input terminal and a live wire output terminal of a wiring disc, the zero wire branch circuit comprises a zero wire input terminal and a zero wire output terminal of the wiring disc, and the ground wire branch circuit comprises a ground wire input terminal and a ground wire output terminal of the wiring disc.
The one end of live wire input terminal is connected with alternating current power supply's live wire, and the other end of live wire input terminal is connected with the one end of live wire output terminal, and the other end and the load branch road of live wire output terminal are connected, are provided with first wave filter between the other end of live wire output terminal and the load branch road, perhaps, are provided with first wave filter between the other end of live wire input terminal and the one end of live wire output terminal.
The first filter can be a magnetic ring, the magnetic ring can be a ring type or a buckle type, the corresponding magnetic ring can be replaced according to the interference frequency band which needs to be solved, the magnetic ring can wind the live wire into a proper number of turns according to the actual impedance requirement, the best mode is that a single live wire penetrates through the magnetic ring, the magnetic ring is fixed by using a heat-shrinkable sleeve, and wire ties can be added at the two ends of the magnetic ring if the sliding influence of the magnetic ring is considered.
Then be provided with first wave filter between the other end of live wire output terminal and the load branch road, can be specifically that the live wire can wind into the magnetic ring of suitable number of turns between the other end of live wire output terminal and the load branch road, and best mode is that single live wire between the other end of live wire output terminal and the load branch road passes the magnetic ring, uses heat shrinkage bush fixed the magnetic ring, if considers the magnetic ring slip influence can add the ligature at the magnetic ring both ends.
Or, be provided with first wave filter between the other end of live wire input terminal and the one end of live wire output terminal, specifically can be that the live wire can wind into the magnetic ring of suitable number of turns between the other end of live wire input terminal and the one end of live wire output terminal, and best mode is that single live wire passes the magnetic ring between the other end of live wire input terminal and the one end of live wire output terminal, uses heat shrinkage bush to fix the magnetic ring, if consider that the magnetic ring slides the influence and can add the ligature at the magnetic ring both ends.
One end of the zero line input terminal is connected with a zero line of an alternating current power supply, the other end of the zero line input terminal is connected with one end of the zero line output terminal, the other end of the zero line output terminal is connected with the load branch, a second filter is arranged between the other end of the zero line output terminal and the load branch, or a second filter is arranged between the other end of the zero line input terminal and one end of the zero line output terminal.
The second filter can be a magnetic ring, the magnetic ring can be a ring type or a buckle type, the corresponding magnetic ring can be replaced according to the interference frequency band which needs to be solved, the magnetic ring can wind the zero line into a proper number of turns according to the actual impedance requirement, the best mode is that a single zero line penetrates through the magnetic ring, the magnetic ring is fixed by using a heat shrinkage sleeve, and wire ties can be added at two ends of the magnetic ring if the sliding influence of the magnetic ring is considered.
A second filter is arranged between the other end of the zero line output terminal and the load branch, specifically, a magnetic ring with a proper number of turns can be wound around the zero line between the other end of the zero line output terminal and the load branch, the best mode is that a single zero line between the other end of the zero line output terminal and the load branch passes through the magnetic ring, a heat-shrinkable sleeve is used for fixing the magnetic ring, and wire ties can be added at two ends of the magnetic ring if the sliding influence of the magnetic ring is considered.
Or a second filter is arranged between the other end of the zero line input terminal and one end of the zero line output terminal, specifically, a magnetic ring with proper number of turns can be wound around a zero line between the other end of the zero line input terminal and one end of the zero line output terminal, the best mode is that a single zero line between the other end of the zero line input terminal and one end of the zero line output terminal passes through the magnetic ring, a heat-shrinkable sleeve is used for fixing the magnetic ring, and if the sliding influence of the magnetic ring is considered, a wire tie can be added at two ends of the magnetic ring.
One end of the ground wire input terminal is connected with a ground wire of the alternating current power supply, the other end of the ground wire input terminal is connected with one end of the ground wire output terminal, the other end of the ground wire output terminal is grounded, and a third filter is arranged between the other end of the ground wire output terminal and the ground, or a third filter is arranged between the other end of the ground wire input terminal and one end of the ground wire output terminal.
The third filter can be a magnetic ring, the magnetic ring can be a ring type or a buckle type, the corresponding magnetic ring can be replaced according to the interference frequency band which needs to be solved, the magnetic ring can wind the ground wire into a proper number of turns according to the actual impedance requirement, the best mode is that a single ground wire penetrates through the magnetic ring, the magnetic ring is fixed by using a heat-shrinkable sleeve, and wire ties can be added at the two ends of the magnetic ring if the sliding influence of the magnetic ring is considered.
A third filter is arranged between the other end of the ground wire output terminal and the ground, specifically, a magnetic ring with a proper number of turns can be wound in the ground wire between the other end of the ground wire output terminal and the ground, as shown in fig. 3, a single zero line between the other end of the ground wire output terminal and the ground (casing) passes through the magnetic ring in a best mode, as shown in fig. 4, a heat shrinkable sleeve is used for fixing the magnetic ring, and wire ties can be added at two ends of the magnetic ring if the sliding influence of the magnetic ring is considered.
Or, a third filter is arranged between the other end of the ground wire input terminal and one end of the ground wire output terminal, specifically, a magnetic ring with a proper number of turns can be wound around the ground wire between the other end of the ground wire input terminal and one end of the ground wire output terminal, as shown in fig. 5, in the best implementation mode, a single zero line between the other end of the ground wire input terminal and one end of the ground wire output terminal passes through the magnetic ring, the magnetic ring is fixed by using a heat shrinkage bush, and if the sliding influence of the magnetic ring is considered, a wire tie can be added at two ends of the magnetic ring.
At this time, a (flat type) magnetic ring is arranged between the other end of the ground wire input terminal and one end of the ground wire output terminal, the other end of the ground wire output terminal directly uses a fastening component (such as a long screw) to directly and effectively contact the ground wire output terminal with the casing, one end of the ground wire input terminal is in good contact in an insertion sheet mode as shown in fig. 6 (a rectangle in fig. 6 is a flat type magnetic ring), or one end of the ground wire input terminal is in good contact with the fastening component (such as a long screw) in a wafer mode as shown in fig. 7 (a rectangle in fig. 7 is a flat type magnetic ring).
In addition, the common mode interference suppression device may further include a communication branch and a fourth filter (other communication modes or functionalities may be sequentially increased, which is not limited in the embodiment of the present invention), where one end of the communication branch is connected to the communication line, the other end of the communication branch is connected to the communication load branch, and the communication branch is provided with the fourth filter, as shown in fig. 8.
The communication branch comprises a communication input terminal and a communication output terminal of a patch panel, one end of the communication input terminal is connected with a communication line, the other end of the communication input terminal is connected with one end of the communication output terminal, the other end of the communication output terminal is connected with a communication load branch, a fourth filter is arranged between the other end of the communication output terminal and the communication load branch, or the other end of the communication input terminal and one end of the communication output terminal are provided with the fourth filter.
The fourth filter can be a magnetic ring, the magnetic ring can be a ring type or a buckle type, the corresponding magnetic ring can be replaced according to the interference frequency band which needs to be solved, the magnetic ring can wind the communication line into a proper number of turns according to the actual impedance requirement, the best mode is that a single communication line penetrates through the magnetic ring, the magnetic ring is fixed by using a heat-shrinkable sleeve, and the wire binding can be added at the two ends of the magnetic ring if the sliding influence of the magnetic ring is considered.
A fourth filter is disposed between the other end of the communication output terminal and the communication load branch, and specifically, a communication line between the other end of the communication output terminal and the communication load branch may be wound with a magnetic ring with an appropriate number of turns, as shown in fig. 9, in a preferred embodiment, a single communication line between the other end of the communication output terminal and the communication load branch passes through the magnetic ring, the magnetic ring is fixed by using a heat shrinkable sleeve, and if considering the sliding effect of the magnetic ring, a wire tie may be added at both ends of the magnetic ring.
Or, a fourth filter is disposed at the other end of the communication input terminal and the one end of the communication output terminal, specifically, a communication line between the other end of the communication input terminal and the one end of the communication output terminal may be wound with a magnetic ring with an appropriate number of turns, as shown in fig. 10, in a preferred embodiment, a single communication line between the other end of the communication input terminal and the one end of the communication output terminal passes through the magnetic ring, the magnetic ring is fixed by using a heat-shrinkable sleeve, and if considering the sliding effect of the magnetic ring, a wire tie may be added at both ends of the magnetic ring.
In addition, according to different electromagnetic interference frequency bands, the magnetic ring can be replaced by other equivalent alternatives, and the third filter comprises one of the following solutions: the resistor, the magnetic bead, the resistor and the capacitor are connected in series. For example, when the third filter is a resistor or a magnetic bead, as shown in fig. 11, and when the third filter is a resistor and a capacitor connected in series, as shown in fig. 12.
A third filter is disposed between the other end of the ground line output terminal and the ground, and specifically, the other end of the ground line output terminal is connected to one end of the third filter, and the other end of the third filter is grounded.
Alternatively, a third filter may be disposed between the other end of the ground input terminal and the one end of the ground output terminal, and specifically, the other end of the ground input terminal may be connected to one end of the third filter, and the other end of the third filter may be connected to one end of the ground output terminal.
In an embodiment of the present invention, there is further provided an inverter (for example, an inverter air conditioner), as shown in fig. 13, including a processor 131, a communication interface 132, a memory 133, and a communication bus 134, where the processor 131, the communication interface 132, and the memory 133 complete communications with each other through the communication bus 134, and the inverter includes the common mode interference suppression device as described in any one of the above.
The communication bus mentioned in the above frequency converter may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the variable frequency electric appliance and other equipment.
The Memory may include a Random Access Memory (RAM) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a storage medium or transmitted from one storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A common mode interference rejection device, comprising: the device comprises a live wire branch, a zero line branch, a ground wire branch, a first filter, a second filter and a third filter;
one end of the live wire branch is connected with a live wire of an alternating current power supply, the other end of the live wire branch is connected with a load branch, and the live wire branch is provided with the first filter;
one end of the zero line branch is connected with a zero line of the alternating current power supply, the other end of the zero line branch is connected with the load branch, and the zero line branch is provided with the second filter;
one end of the ground wire branch is connected with the ground wire of the alternating current power supply, the other end of the ground wire branch is grounded, and the third filter is arranged on the ground wire branch.
2. The common mode interference rejection device according to claim 1, wherein said live line branch comprises a live line input terminal and a live line output terminal of a patch panel, one end of said live line input terminal is connected to a live line of said ac power source, the other end of said live line input terminal is connected to one end of said live line output terminal, the other end of said live line output terminal is connected to a load branch;
the first filter is arranged between the other end of the live wire output terminal and the load branch circuit, or the first filter is arranged between the other end of the live wire input terminal and one end of the live wire output terminal.
3. The common mode interference rejection device according to claim 1, wherein said neutral branch comprises a neutral input terminal and a neutral output terminal of a patch panel, one end of said neutral input terminal is connected to a neutral of said ac power supply, the other end of said neutral input terminal is connected to one end of said neutral output terminal, and the other end of said neutral output terminal is connected to said load branch;
the second filter is arranged between the other end of the zero line output terminal and the load branch circuit, or the second filter is arranged between the other end of the zero line input terminal and one end of the zero line output terminal.
4. The common mode interference rejection device according to claim 1, wherein said ground line branch includes a ground line input terminal and a ground line output terminal of a patch panel, one end of said ground line input terminal is connected to a ground line of said alternating current power supply, the other end of said ground line input terminal is connected to one end of said ground line output terminal, and the other end of said ground line output terminal is grounded;
the third filter is disposed between the other end of the ground line output terminal and the ground, or the third filter is disposed between the other end of the ground line input terminal and one end of the ground line output terminal.
5. A common-mode interference rejection device according to any one of claims 1 to 4, further comprising a communication branch, a fourth filter;
one end of the communication branch is connected with the communication line, the other end of the communication branch is connected with the communication load branch, and the communication branch is provided with the fourth filter.
6. A common-mode interference rejection device according to claim 5, wherein said communication branch comprises a communication input terminal and a communication output terminal of a patch panel, one end of said communication input terminal is connected to a communication line, the other end of said communication input terminal is connected to one end of said communication output terminal, the other end of said communication output terminal is connected to a communication load branch;
the fourth filter is arranged between the other end of the communication output terminal and the communication load branch, or the fourth filter is arranged between the other end of the communication input terminal and one end of the communication output terminal.
7. A common-mode interference rejection device according to claim 5, wherein said first filter, said second filter, said third filter, said fourth filter each comprise a magnetic loop, and wherein said type of magnetic loop comprises a ring type or a snap-in type.
8. A common-mode interference rejection device according to claim 4, wherein said third filter comprises one of: the resistor, the magnetic beads, and the resistor and the capacitor which are connected in series;
the other end of the ground wire output terminal is connected with one end of the third filter, and the other end of the third filter is grounded;
the other end of the ground input terminal is connected to one end of the third filter, and the other end of the third filter is connected to one end of the ground output terminal.
9. A common-mode interference rejection device according to claim 4, wherein one end of said ground input terminal comprises a tab or said one end of said ground input terminal comprises a wafer and fastening assembly.
10. A variable frequency electrical appliance, comprising: a common mode interference rejection device as claimed in any one of claims 1 to 9.
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