CN211785700U - Differential-common mode signal separator and artificial power network system - Google Patents
Differential-common mode signal separator and artificial power network system Download PDFInfo
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- CN211785700U CN211785700U CN202022067488.3U CN202022067488U CN211785700U CN 211785700 U CN211785700 U CN 211785700U CN 202022067488 U CN202022067488 U CN 202022067488U CN 211785700 U CN211785700 U CN 211785700U
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Abstract
The application provides a differential-common mode signal separator and an artificial power network system. The differential-mode and common-mode signal separator comprises a thirteenth input end, a fourteenth input end, a fifth grounding end, a fourth differential-mode output end, a fourth common-mode output end, a second signal extraction node, a seventh resistor and an isolation element; the thirteenth input end and the fourteenth input end are respectively and directly connected with the second signal extraction node; the isolation element is connected between the second signal extraction node and the fourth differential mode output terminal; a seventh resistor connected between the fifth ground terminal and the second signal extraction node connected to the fourth common nodeAnd (4) a die output end. The differential mode signal current I is inhibited by not adopting an inductorDMTherefore, the influence of the inductance magnetic core and the winding on the common-differential mode isolation, the bandwidth limitation and the batch stability can be avoided, the common-differential mode isolation can be improved, the electromagnetic compatibility regulation requirement can be met, and the isolation stability is better.
Description
Technical Field
The application mainly relates to the technical field of electromagnetic signal extraction, in particular to a differential-common mode signal separator and an artificial power network system.
Background
Separating the conducted Differential Mode (DM) and Common Mode (CM) signals is critical to signal diagnostics and Electromagnetic Interference (EMI) filter design in power electronics applications.
At present, the mainstream differential-mode and common-mode separation technology extracts differential-mode signals and common-mode signals in a magnetic device in a magnetic line cancellation mode.
However, the mainstream differential-common mode signal separation technology is actually realized by adopting two inductors due to the relative permeability u of the magnetic corerThe saturation flux density of the core material and the parasitic parameters of the winding lead to the following 3 main drawbacks:
1. poor common mode isolation is insufficient: the prior art can only reach 40dB @150kHz-30MHz at most. Therefore, the extracted differential mode signal will be mixed with the common mode signal, and the extracted common mode signal will be mixed with the differential mode signal, which will mislead the signal diagnosis conclusion and affect the design result of the EMI filter.
2. The bandwidth cannot meet the requirements of electromagnetic compatibility regulations: the prior art can only meet the bandwidth of 150kHz-30MHz, and can not meet the requirement of 9 kHz-108 MHz bandwidth required by electromagnetic compatibility regulations, for example, the requirement of conducted interference regulations of electric vehicles on the bandwidth reaches 108MHz, while the bandwidth of the current differential common-mode separator can only reach 30 MHz; the requirement of the conduction interference regulation of household appliances and lamps on the bandwidth is as low as 9kHz, and the requirement of the bandwidth frequency band of 9 kHz-150 MHz can not be met due to the limit value of the saturation magnetic flux density of the magnetic core material of the magnetic device in the prior art.
3. Poor isolation stability: in the current mainstream scheme, a magnetic device is adopted to extract a differential mode signal and a common mode signal, parasitic parameters of the magnetic device can seriously influence the isolation index of more than 10MHz, and meanwhile, the stability of batch production cannot be ensured.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application will be solved provides a difference common mode signal separator and artifical power network system, can improve common mode isolation, satisfies the electromagnetic compatibility law requirement and has better isolation stability.
In order to solve the above technical problem, the present application provides a differential-mode and common-mode signal separator, which includes a thirteenth input terminal, a fourteenth input terminal, a fifth ground terminal, a fourth differential-mode output terminal, and a fourth common-mode output terminal, and further includes a second signal extraction node, a seventh resistor, a first double-pole double-throw switch, and an isolation element, where the first double-pole double-throw switch includes a first switch input terminal, a second switch input terminal, a first switch output terminal, a second switch output terminal, a third switch output terminal, and a fourth switch output terminal, and the isolation element includes a first pin and a third pin; the thirteenth input end and the fourteenth input end are respectively connected with the second switch input end and the first switch input end; the first switch output end and the third switch output end are connected with the second signal extraction node; the isolation element is connected between the first double-pole double-throw switch and the fourth differential mode output end; the second switch output end and the fourth switch output end are respectively connected with the first pin and the third pin; and the seventh resistor is connected between the fifth ground terminal and the second signal extraction node, and the second signal extraction node is connected to the fourth common mode output terminal.
Optionally, the seventh resistor is matched with an internal resistance of a tester connected to the fourth common mode output terminal.
Optionally, the differential-mode and common-mode signal separator further includes a third resistor and a fourth ground terminal, the third resistor is connected between the isolation element and the fourth ground terminal, and the third resistor is matched with an internal resistance of a tester connected to the fourth differential-mode output terminal.
Optionally, the isolation element comprises one inductor or a plurality of inductors connected in series, and the first pin and the third pin belong to different windings.
Optionally, the common mode signal rejection frequency bands of the plurality of inductors are different.
The present application further provides an artificial power network system, including: the artificial power supply network is provided with a live wire input end for connecting a live wire, a ground input end for connecting the ground and a zero line input end for connecting a zero line, and is provided with a first output end, a second output end, a third output end, a fourth output end and a fifth output end, wherein the third output end, the fourth output end and the fifth output end are used for outputting differential mode signals and common mode signals to the tested electronic equipment; a differential-common mode signal separator as described above; and the change-over switch circuit is provided with a first connecting path and a second connecting path which can be switched, the first connecting path is used for enabling the first output end and the second output end of the artificial power supply network to be output without passing through the difference-common mode signal separator, and the second connecting path is used for enabling the first output end and the second output end of the artificial power supply network to be connected to the tenth input end and the eleventh input end of the difference-common mode signal separator.
Optionally, the second connection path is further configured to connect a third differential mode output terminal and a third common mode output terminal of the differential-mode and common-mode signal separator to ground, respectively.
Optionally, the first connection path is further configured to connect a third differential mode output terminal and a third common mode output terminal of the differential-mode and common-mode signal separator to the first test pin and the second test pin.
Compared with the prior art, the method has the following advantages:
because no inductance is adopted to suppress the differential mode signal current IDMTherefore, the influence of the inductance magnetic core and the winding on the common-differential mode isolation, the bandwidth limitation and the batch stability can be avoided, the common-differential mode isolation can be improved, the electromagnetic compatibility regulation requirements can be met, and the isolation stability is better, so that the design and optimization of the differential-common mode component of the diagnostic signal and the EMI filter can be facilitated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the principle of the invention. In the drawings:
fig. 1 is a schematic diagram of an applied circuit structure of a differential-common mode signal separator.
Fig. 2 is a schematic circuit diagram of a differential-mode signal separator.
Fig. 3 is a schematic circuit diagram of a common mode signal extractor.
Fig. 4 is a schematic diagram of an applied circuit structure of a differential-common mode signal separator according to a first embodiment of the present application.
Fig. 5 is a schematic circuit diagram of a differential-common mode signal separator according to a first embodiment of the present application.
Fig. 6 is a schematic circuit diagram of a differential-common mode signal separator according to a second embodiment of the present application.
Fig. 7 is a schematic circuit configuration diagram of an artificial power supply network system according to a third embodiment of the present application.
Fig. 8 is a circuit schematic diagram of a first mode of a switcher circuit according to an embodiment of the application.
Fig. 9 is a circuit schematic diagram of a second mode of a switcher circuit according to an embodiment of the application.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only examples or embodiments of the application, from which the application can also be applied to other similar scenarios without inventive effort for a person skilled in the art. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.
It will be understood that when an element is referred to as being "on," "connected to," "coupled to" or "contacting" another element, it can be directly on, connected or coupled to, or contacting the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to" or "directly contacting" another element, there are no intervening elements present. Similarly, when a first component is said to be "in electrical contact with" or "electrically coupled to" a second component, there is an electrical path between the first component and the second component that allows current to flow. The electrical path may include capacitors, coupled inductors, and/or other components that allow current to flow even without direct contact between the conductive components.
Fig. 1 is a schematic diagram of an applied circuit structure of a differential-common mode signal separator. As shown in FIG. 1, the first artificial power network 120 is essential in the conducted interference standard testA signal extraction device is employed having a live input 121, a ground input 122, a neutral input 123, a first output 124, a second output 125, a third output 126, a fourth output 127 and a fifth output 128. The output current of the third output terminal 126 is IDM+ICM/2, and the output current of the fourth output terminal 127 is-IDM+ICM/2. Black arrows indicate common-mode signal current ICMOr component I thereofCM/2, open arrows indicate differential mode signal current IDM。
In fig. 1, the first differential-to-common mode signal separator 110 has a first input terminal 111, a second input terminal 112, a first ground terminal 113, a first differential-to-common mode output terminal 114, and a first common-to-common mode output terminal 115. The first input 111 of the first differential-common mode signal separator 110 is connected to a first output 124 of the first artificial power network 120. The second input 112 of the first differential-common mode signal separator 110 is connected to the second output 125 of the first artificial power network 120. The first ground terminal 113 of the first differential-common mode signal separator 110 is grounded. The electronic device under test 130 has a third input 131, a fourth input 132 and a fifth input 133. A third input 131 of the electronic device under test 130 is connected to the third output 126 of the first manual power supply network 120. The fourth input 132 of the electronic device under test 130 is connected to the fourth output 127 of the first manual power supply network 120. The fifth input 133 of the electronic device under test 130 is connected to the fifth output 128 of the first manual power supply network 120 and connected to ground. The first resistor R1 and the second resistor R2 are the internal resistance or 50W impedance of the tester to meet the impedance matching test requirement. One end of the first resistor R1 is connected to the first common-mode output terminal 115 of the first differential-common mode signal separator 110. The other end of the first resistor R1 is connected to the ground. One end of the second resistor R2 is connected to the first differential-mode output terminal 114 of the first differential-mode signal separator 110. The other end of the second resistor R2 is connected to the ground.
As shown in fig. 1, the output signal of the first artificial power network 120 is output to the first differential-common mode signal separator 110 for addition or subtraction to obtain the differential mode signal current IDMAnd common mode signal current ICMThe component (c).
At present, the mainstream differential-mode and common-mode separation technology extracts differential-mode signals and common-mode signals in a magnetic device in a magnetic line cancellation mode. Fig. 2 is a schematic circuit diagram of a differential-mode signal separator. As shown in fig. 1 and 2, the first output terminal 124 and the second output terminal 125 of the first manual power supply network 120 are respectively output to the first input terminal 111 and the second input terminal 112 of the first differential-common mode signal separator 110. Output current I of the first output 124 of the first manual power supply network 120DM+ICMThe output current-I flowing into the first input 111 of the first differential-common mode signal separator 110 and the second output 125 of the first artificial power network 120 isDM+ICMThe/2 signal will flow into the second input terminal 112 of the first differential-common mode signal separator 110.
When the output currents of the first output terminal 124 and the second output terminal 125 of the first manual power supply network 120 flow through the first inductor L1, the differential mode signal current I is supplied because the first winding N1 and the second winding N2 of the first inductor L1 are connected in series with the sixth pin 2 and the seventh pin 3 having opposite polaritiesDMA large impedance is created, resulting in a large attenuation. And a common mode signal current component I of the output signals from the first output terminal 124 and the second output terminal 125 of the first artificial power supply network 120CMThe voltage drop generated by the first winding N1 and the second winding N2 is just counteracted when the voltage drop is equal to/2 and flows in the same direction through the first winding N1 and the second winding N2 of the first inductor L1, so that the common-mode signal current component I is just counteractedCMThe/2 can smoothly pass through the first winding N1 and the second winding N2 of the first inductor L1 without attenuation. Finally, the common-mode signal voltage V without attenuation can be detected at the first common-mode output terminal 115 of the first differential-common-mode signal separator 110 by the tester 140 (the fifth resistor R5 is the internal resistance of the tester)CMAnd the greatly attenuated differential mode signal voltage VDM。
When the output signals of the first output terminal 124 and the second output terminal 125 of the first artificial power supply network 120 flow through the second inductor L2, since the third winding N3 and the fourth winding N4 of the second inductor L2 are connected to the output signals of the first output terminal 124 and the second output terminal 125 of the first artificial power supply network 120 through the first pin 11 and the third pin 13 having the same polarity, respectively, the second inductor L2 is connected to the output signals of the first output terminal 124 and the second output terminal 125 of the first artificial power supply network 120, respectivelyThe third winding N3 and the fourth winding N4 of the inductor L2 supply a common-mode signal current component ICMThe/2 generates a large impedance, resulting in a large attenuation. While the differential mode signal current IDMThe voltage drops generated when the current flows through the third winding N3 and the fourth winding N4 of the second inductor L2 are exactly balanced, so that the differential mode signal current IDMThe third winding N3 and the fourth winding N4 of the second inductor L2 can pass through smoothly without attenuation. Finally, the voltage V of the differential mode signal without attenuation is detected at the first differential mode output terminal 114 of the first differential-mode and common-mode signal separator 110 through the tester 140 (the eighth resistor R8 is the internal resistance of the tester, which is 50W)DMAnd a very attenuated common mode signal voltage VCM。
Fig. 3 is a schematic circuit diagram of a common mode signal extractor. As shown in fig. 3, the common mode signal extractor 210 has a sixth input terminal 211, a seventh input terminal 212, a second ground terminal 213 and a second common mode output terminal 214, and includes a first common mode signal extraction node 219 and a seventh resistor R7 therein. The seventh resistor R7 is connected between the second ground terminal 213 and the first common mode signal extraction node 219. The sixth input terminal 211 and the seventh input terminal 212 are directly connected to the first common mode signal extraction node 219, respectively. The first common mode signal extraction node 219 is connected to the second common mode output terminal 214. Optionally, the seventh resistor R7 is matched with the internal resistance of the tester 140 to which the second common mode output terminal 214 is connected, i.e., the fifth resistor R5.
The common mode signal extractor 210 may be connected to a first artificial power network 120 like fig. 1. The sixth input 211 of the common mode signal extractor 210 is connected to the first output 124 of the first manual power supply network 120, the seventh input 212 of the common mode signal extractor 210 is connected to the second output 125 of the first manual power supply network 120, and the second ground 213 of the common mode signal extractor 210 is grounded. The sixth input terminal 211, the seventh input terminal 212 and the second common-mode output terminal 214 of the common-mode signal extractor 210 are connected to one end of a seventh resistor R7. The other end of the seventh resistor R7 is grounded via the second ground terminal 213 of the common mode signal extractor 210. The second common mode output terminal 214 of the common mode signal extractor 210 is connected to the tester 140. The internal resistance of the tester 140, i.e. the fifth resistor R5, may be 50W, and the impedance of the seventh resistor R7 may be 50W, to achieve the impedance matching test requirements.
As can be taken from fig. 3, the differential-mode signal current I in the output currents from the first output 124 and the second output 125 of the first artificial power supply network 120DMDoes not flow through the fifth resistor R5 and the seventh resistor R7 which are connected to the ground, and only has the common-mode signal current component I in the same directionCMThe/2 will flow into the fifth resistor R5 and the seventh resistor R7, respectively, to ground. Thus, the tester 140 will only detect the common mode signal current component ICM/2 common mode signal voltage V generatedCMTherefore, high isolation of 80dB can be obtained, and the bandwidth can be expanded to more than 300 MHz.
The common mode signal extractor does not adopt an inductor to suppress the differential mode signal current IDMTherefore, the defects of the prior art can be overcome, and the influence of the inductance magnetic core and the winding on the common-differential mode isolation, the bandwidth limitation and the batch stability can be avoided.
The common mode signal extractor can be further applied to a differential-common mode signal separator and an artificial power network system.
Example 1
Fig. 4 is a schematic diagram of an applied circuit structure of a differential-common mode signal separator according to a first embodiment of the present application. Fig. 5 is a schematic circuit diagram of a differential-common mode signal separator according to a first embodiment of the present application. The second differential-common mode signal separator 210a described in this embodiment can be applied to the scheme shown in fig. 4.
As shown in fig. 4, when conducting the conducted interference test on the electronic device under test 130, the third input terminal 131 of the electronic device under test 130 is connected to the sixth output terminal 222 of the second artificial power supply network 220a, the fourth input terminal 132 of the electronic device under test 130 is connected to the eighth output terminal 225 of the third artificial power supply network 220b, and the fifth input terminal 133 of the electronic device under test 130 is connected to the ground. An eighth input 221 of the second artificial power supply network 220a is connected to the dc input Vin +, and a seventh output 223 of the second artificial power supply network 220a is connected to a thirteenth input 211a of the second differential-common mode signal separator 210 a. A ninth input 224 of the third artificial power supply network 220b is connected to the dc input Vin-, and a ninth output 226 of the third artificial power supply network 220b is connected to the fourteenth input 212a of the second differential-common mode signal separator 210 a. The fifth ground terminal 213a of the second differential-common mode signal separator 210a is grounded. The fourth common mode output terminal 214a of the second differential-common mode signal separator 210a is connected to a fifth resistor R5, and the fifth resistor R5 is an equivalent impedance 50W or an equivalent impedance matching 50W of the tester. The fourth differential mode output terminal 215a of the second differential-mode signal separator 210a is connected to an eighth resistor R8, and the eighth resistor R8 is an equivalent impedance 50W or an equivalent matching impedance 50W of the tester.
In the application of the second differential-common mode signal separator 210a shown in fig. 4, the common mode signal component can be obtained at the fourth common mode output terminal 214a of the second differential-common mode signal separator 210a, and the differential mode signal component can be obtained at the fourth differential mode output terminal 215a of the second differential-common mode signal separator 210a, so as to be used for signal common-differential mode component diagnosis of the device under test, and corresponding EMI filter design and optimization.
Fig. 5 is a schematic circuit diagram of a differential-common mode signal separator according to a first embodiment of the present application. The common mode signal extractor described above and in fig. 3 can be used in particular as shown in fig. 5.
As shown in fig. 5, the second differential-common mode signal separator 210a includes a thirteenth input terminal 211a, a fourteenth input terminal 212a, a fifth ground terminal 213a, a fourth common mode output terminal 214a, a fourth differential mode output terminal 215a, a second signal extraction node 216, a seventh resistor R7, a first double-pole double-throw switch 330, and an isolation element 217. Optionally, the second differential-common mode signal separator 210a further includes a third resistor R3 and a fourth ground terminal 413. The third resistor R3 is connected between the second pin 12 of the third winding N3 of the isolation element 217 and the fourth ground 413. The third resistor R3 matches the internal resistance of the tester (i.e., the eighth resistor R8) to which the fourth differential mode output terminal 215a is connected. The thirteenth input 211a and the fourteenth input 212a of the second differential-common mode signal separator 210a are connected to the first switch input 327a and the second switch input 328a, respectively, of the first double pole double throw switch 330. A first pin 11 of the third winding N3 of the isolation element 217 is connected to a pin of the second switch output 327c of the first double pole double throw switch 330; the third pin 13 of the fourth winding N4 of the isolation element 217 is connected to the pin of the fourth switch output 328c of the first double pole double throw switch 330; the second pin 12 of the third winding N3 of the isolation element 217 is connected to ground via a third resistor R3; the fourth pin 14 of the fourth winding N4 of the isolation element 217 is connected to the fourth differential mode output terminal 215 a; one end of the seventh resistor R7 is connected to the fifth ground terminal 213 a; the other end of the seventh resistor R7 is connected to the second signal extraction node 216, the second signal extraction node 216 is connected to the pin of the first switch output 327b and the pin of the third switch output 328b of the first double pole double throw switch 330, and the second signal extraction node 216 is connected to the fourth common mode output 214 a.
Optionally, the seventh resistor R7 is matched with the internal resistance of the tester 140 connected to the fourth common mode output terminal 214a, i.e., the fifth resistor R5. In the present embodiment, the isolation element 217 includes a second inductor L2, and the first pin 11 of the third winding N3 of the second inductor L2 and the third pin 13 of the fourth winding N4 are of the same polarity.
The first double pole double throw switch 330 has two switching modes: an up-cut mode and an down-cut mode.
When the first double pole double throw switch 330 operates in the up-cut mode, the pin of the first switch input 327a and the pin of the second switch input 328a are connected to the pin of the first switch output 327b and the pin of the third switch output 328b, respectively, to form a first connection path, and the thirteenth input end 211a and the fourteenth input end 212a of the second differential-common mode signal splitter 210a are directly connected to the second signal extraction node 216, the seventh resistor R7 and the fourth common mode output 214a, so as to implement the function of the common mode signal extractor shown in fig. 3. As can be taken from fig. 4, the differential-mode signal current I in the output currents from the seventh output 223 of the second artificial power supply network 220a and the ninth output 226 of the third artificial power supply network 220bDMWill not flow through the fifth resistor R5 and the seventh resistor R7 connected to ground in the second differential-common mode signal separator 210a, and only has the common mode signal current component I in the same directionCMThe/2 will flow into the fifth resistor R5 and the seventh resistor R7, respectively, to ground. Thus, the tester 140 will only detect the common mode signal current component ICM/2 common mode signal voltage V generatedCMThus, it isThe high isolation of the differential mode signal of 80dB can be obtained, and the bandwidth can be expanded to more than 300 MHz.
When the first double pole double throw switch 330 is operating in the down-switch mode, the pin of the first switch input 327a and the pin of the second switch input 328a are connected to the pin of the second switch output 327c and the pin of the fourth switch output 328c, respectively, to form a second connection path, the thirteenth input 211a and the fourteenth input 212a of the second differential-common mode signal separator 210a are connected to the pin of the second switch output 327c and the pin of the fourth switch output 328c of the first double pole double throw switch 330, respectively, and the pin of the second switch output 327c and the pin of the fourth switch output 328c are connected to the first pin 11 of the third winding N3 and the third pin 13 of the fourth winding N4 of the second inductor L2, respectively, as shown in fig. 5. As can be seen from fig. 4, when the output signal currents from the seventh output terminal 223 of the second artificial power supply network 220a and the ninth output terminal 226 of the third artificial power supply network 220b flow through the second inductor L2, since the first pin 11 of the third winding N3 of the second inductor L2 and the third pin 13 of the fourth winding N4 are of the same polarity, the third winding N3 and the fourth winding N4 of the second inductor L2 give the common mode signal current component ICMThe/2 generates a large impedance, resulting in a large attenuation. While the differential mode signal current IDMThe voltage drops generated when the current flows through the third winding N3 and the fourth winding N4 of the second inductor L2 are exactly balanced, so that the differential mode signal current IDMThe third N3 and the fourth winding N4 of the second inductor L2 can be smoothly passed without attenuation. Finally, the voltage V of the differential mode signal without attenuation is detected by the tester 140 (the eighth resistor R8 is the internal resistance of the tester, which is 50W)DMAnd a very attenuated common mode signal voltage VCM。
The second differential-common mode signal separator 210a proposed in this embodiment can obtain a common mode signal and a differential mode signal with high isolation respectively through the up-cut mode and the down-cut mode of the first double-pole double-throw switch 330. The embodiment can be applied to extracting common-mode signals and differential-mode signals from direct-current power supply electric equipment, and is particularly suitable for being applied to electromagnetic interference tests of electric automobile parts and military electronic equipment, and helps to diagnose the differential-mode and common-mode components of signals and design and optimize an EMI filter.
Example 2
Fig. 6 is a schematic circuit diagram of a differential-common mode signal separator according to a second embodiment of the present application. Compared with the first embodiment, for differential-mode signal extraction, the third differential-common mode signal separator 210b of the present embodiment adds a third inductor L3 in series with the second inductor L2 in the isolation element 217, forming a dual-inductor signal extraction scheme. Optionally, the isolation element 217 may include more than two series inductors, and the number of series inductors is not limited in the present application. Alternatively, when the isolation element 217 includes multiple inductors, the common mode signal rejection band of the multiple inductors may be different.
When the second inductor L2 uses a magnetic core material with poor high-frequency characteristics and the suppression capability of the second inductor L3 for the common-mode signal is not sufficient in the high-frequency band, the third inductor L2 can use a magnetic core material with good high-frequency characteristics to compensate the deficiency of the suppression capability of the second inductor L2 for the common-mode signal in the high-frequency band. For example, the second inductor L2 can be made of manganese-zinc magnetic material and is mainly used for processing signals in a frequency band of 9 kHz-10 MHz; the third inductor L3 can be made of nickel-zinc magnetic material, and is mainly used for processing signals in the frequency range of 1MHz to 500MHz and above. The third inductor L3 can also be used as the only inductor in the differential-mode signal splitter as in the second inductor L2 and can perform the differential-mode signal extraction effect, but may be limited by the frequency band range.
The third differential-to-common mode signal separator 210b in this embodiment does not use an inductor to suppress the differential mode signal current IDMTherefore, the defects of the prior art can be overcome, and the influence of the inductance magnetic core and the winding on the common-differential mode isolation, the bandwidth limitation and the batch stability can be avoided. Meanwhile, the differential-mode and common-mode signal separator in the embodiment can widen the bandwidth of differential-mode signal extraction and extract differential-mode signals with high isolation by adopting double inductors to extract signals.
Example 3
Fig. 7 is a schematic circuit configuration diagram of an artificial power supply network system according to a third embodiment of the present application. Fig. 8 is a circuit schematic diagram of a first mode of a switcher circuit according to an embodiment of the application. Fig. 9 is a circuit schematic diagram of a second mode of a switcher circuit according to an embodiment of the application. As shown in fig. 7, the fourth artificial power network system 300 includes the first artificial power network 120, a fourth differential-common mode signal separator 310, and a switch circuit 320.
The first manual power supply network 120 has a live input 121, a ground input 122, and a neutral input 123, and has a first output 124, a second output 125, a third output 126, a fourth output 127, a fifth output 128, and a tenth output 129 connected to ground through a fourth resistor R4. The third output 126, the fourth output 127 and the fifth output 128 are used for connecting an electronic device 130 to be tested. The first artificial power network 120 may be a conventional artificial power network in the prior art.
The fourth differential-to-common mode signal separator 310 can be any of the aforementioned second differential-to-common mode signal separator 210a, third differential-to-common mode signal separator 210b, or a variation thereof. The switch circuit 320 is connected to the first manual power supply network 120 and the fourth differential-common mode signal separator 310. The switch circuit 320 has a switchable four-pole double-throw switch 320a and a second double-pole double-throw switch 320 b. In summary, the switching of the four-pole double-throw switch 320a and the second double-pole double-throw switch 320B can form the first connection path 3A shown in fig. 8 and the second connection path 3B shown in fig. 9, respectively. The first connection path 3A is used to connect the first output terminal 124 and the second output terminal 125 of the first manual power supply network 120 to ground through the ninth resistor R9 and the fourth resistor R4, respectively, without passing through the fourth differential-common mode signal separator 310. Meanwhile, the first connection path 3A also connects the third common mode output terminal 314 and the third differential mode output terminal 315 of the fourth differential-common mode signal separator 310 to a pin of the eleventh switch output terminal 324b and a pin of the ninth switch output terminal 323b, respectively. The second connection path 3B is used to connect the first output 124 and the second output 125 of the first manual power supply network 120 to the tenth input 312 and the eleventh input 311 of the fourth differential-common mode signal separator 310, and connect the third common mode output 314 and the third differential mode output 315 of the fourth differential-common mode signal separator 310 to the pin of the twelfth switch output 324c and the pin of the tenth switch output 323c, respectively.
Therefore, the fourth manual power supply network system 300 of the present embodiment can implement two modes by switching the four-pole double-throw switch 320a and the second double-pole double-throw switch 320b when testing the conducted interference signal: a conventional conducted interference signal test mode (shown with reference to fig. 8) and a differential-common mode signal separation test mode (shown with reference to fig. 9). A conventional conducted interference signal test pattern may be used for conventional conducted interference testing. The differential-to-common mode signal separation test mode can be used for common-to-differential mode component diagnosis and corresponding EMI filter design and optimization of the device under test signals.
As shown in fig. 7 and 8, the first output 124 of the first manual power network 120 is connected to the pin of the third switch input 321a of the four-pole double-throw switch 320a, and the second output 125 is connected to the pin of the fourth switch input 322a of the four-pole double-throw switch 320 a. The eleventh input 311 of the fourth differential-common mode signal separator 310 is connected to the eighth switch output 322c of the four-pole double-throw switch 320a, the tenth input 312 of the fourth differential-common mode signal separator 310 is connected to the pin of the sixth switch output 321c of the four-pole double-throw switch 320a, and the third ground 313 of the fourth differential-common mode signal separator 310 is grounded. In one embodiment, the third common mode output terminal 314 and the third differential mode output terminal 315 of the fourth differential-common mode signal separator 310 are connected to a first test pin and a second test pin, respectively, wherein the first test pin may be a pin of the sixth switch input terminal 324a of the four-pole double-throw switch 320a, and the second test pin may be a pin of the fifth switch input terminal 323a of the four-pole double-throw switch 320 a. That is, the third common mode output terminal 314 of the fourth differential-common mode signal separator 310 is connected to the pin of the sixth switch input terminal 324a of the four-pole double throw switch 320a, and the third differential mode output terminal 315 of the fourth differential-common mode signal separator 310 is connected to the pin of the fifth switch input terminal 323a of the four-pole double throw switch 320 a. A pin of the fifth switch output terminal 321b of the four-pole double-throw switch 320a and a pin of the tenth switch output terminal 323c are connected to be connected to a pin of the seventh switch input terminal 325a of the second double-pole double-throw switch 320b, and a pin of the seventh switch output terminal 322b of the four-pole double-throw switch 320a and a pin of the twelfth switch output terminal 324c are connected to be connected to a pin of the eighth switch input terminal 326a of the second double-pole double-throw switch 320 b. The pin of the thirteenth switch output 325b of the second double pole double throw switch 320b is connected to a ninth resistor R9, wherein the ninth resistor R9 may be 50W matched impedance. The pin of the sixteenth switch output 326c of the second double pole double throw switch 320b is connected to a sixth resistor R6, wherein the sixth resistor R6 may be 50W matched impedance. A pin of the fourteenth switch output 325c of the second double pole double throw switch 320b and a pin of the fifteenth switch output 326b are connected to connect to the tenth output 129 of the fourth manual power supply network system 300. The tenth output terminal 129 of the fourth artificial power network system 300 is connected to a fourth resistor R4, wherein the fourth resistor R4 may be the internal impedance 50W of the tester.
The four pole, double throw switch 320a has 2 switching modes: up-cut and down-cut modes. As shown in fig. 8, when the four-pole double-throw switch 320a is turned on, the pin of the third switch input 321a is connected to the pin of the fifth switch output 321b, the pin of the fourth switch input 322a is connected to the pin of the seventh switch output 322b, the pin of the fifth switch input 323a is connected to the pin of the ninth switch output 323b, and the pin of the sixth switch input 324a is connected to the pin of the eleventh switch output 324 b. As shown in fig. 9, when the four-pole double-throw switch 320a is switched down, the pin of the third switch input 321a is connected to the pin of the sixth switch output 321c, the pin of the fourth switch input 322a is connected to the eighth switch output 322c, the pin of the fifth switch input 323a is connected to the pin of the tenth switch output 323c, and the pin of the sixth switch input 324a is connected to the pin of the twelfth switch output 324 c.
The second double pole double throw switch 320b has 2 switching modes: up-cut and down-cut modes. As shown in fig. 8, when the second double-pole double-throw switch 320b is turned on, the pin of the seventh switch input 325a is connected to the pin of the thirteenth switch output 325b, and the pin of the eighth switch input 326a is connected to the pin of the fifteenth switch output 326 b. As shown in fig. 9, when the second double-pole double-throw switch 320b is switched down, the pin of the seventh switch input 325a is connected to the pin of the fourteenth switch output 325c, and the pin of the eighth switch input 326a is connected to the pin of the sixteenth switch output 326 c.
When the four-pole double-throw switch 320a operates in the up-cut mode, the fourth manual power supply network system 300 of the present embodiment operates in the normal conducted interference signal test mode. And then by operating the up-cut mode or the down-cut mode of the second double-pole double-throw switch 320b, the test of the conducted interference signal of the live wire-L or the zero wire-N can be realized, and whether the conducted interference signal of the tested equipment meets the requirement of the electromagnetic interference regulation limit value or not is judged. When the second double-pole double-throw switch 320b operates in the up-cutting mode, the fourth manual power supply network system 300 can realize a conducted interference signal test for testing the neutral line-N; when the second double pole double throw switch 320b operates in the down-switch mode, the fourth manual power supply network system 300 may implement a conducted jammer test for testing line-L.
When the four-pole double-throw switch 320a operates in the down-switch mode, the fourth artificial power network system 300 with differential-common mode separation proposed in the present application operates in the differential-common mode signal separation test mode. The testing of the common mode component and the differential mode component of the conducted signal can be achieved by operating the up-cut mode or the down-cut mode of the second double-pole double-throw switch 320 b. The fourth artificial power network system 300 is used for common-difference mode component diagnosis of the device under test signal and corresponding EMI filter design and optimization. When the second double-pole double-throw switch 320b operates in the up-cut mode, the fourth artificial power network system 300 can implement a test of a common-mode component of a conducted signal; the fourth artificial power network system 300 conducts a test of the differential mode component of the signal when the second double pole double throw switch 320b is operating in the down-cut mode.
The artificial power network system in the embodiment of the present application, by integrating the differential-common mode signal separator in the foregoing embodiments of the present application, may be applied to an electronic device with ac input to extract a common mode signal and a differential mode signal, and help to diagnose the differential-common mode component of the signal and design and optimize an EMI filter.
Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.
Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.
Similarly, it should be noted that in the preceding description of embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.
Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.
Although the present application has been described with reference to the present specific embodiments, it will be recognized by those skilled in the art that the foregoing embodiments are merely illustrative of the present application and that various changes and substitutions of equivalents may be made without departing from the spirit of the application, and therefore, it is intended that all changes and modifications to the above-described embodiments that come within the spirit of the application fall within the scope of the claims of the application.
Claims (8)
1. A differential-mode and common-mode signal separator comprises a thirteenth input end, a fourteenth input end, a fifth grounding end, a fourth differential-mode output end and a fourth common-mode output end, and is characterized by further comprising a second signal extraction node, a seventh resistor, a first double-pole double-throw switch and an isolation element,
wherein the first double-pole double-throw switch comprises a first switch input terminal, a second switch input terminal, a first switch output terminal, a second switch output terminal, a third switch output terminal and a fourth switch output terminal, and the isolation element comprises a first pin and a third pin;
the thirteenth input end and the fourteenth input end are respectively connected with the second switch input end and the first switch input end;
the first switch output end and the third switch output end are connected with the second signal extraction node;
the isolation element is connected between the first double-pole double-throw switch and the fourth differential mode output end, wherein the second switch output end and the fourth switch output end are respectively connected with the first pin and the third pin; and
the seventh resistor is connected between the fifth ground terminal and the second signal extraction node, and the second signal extraction node is connected to the fourth common mode output terminal.
2. The differential-and-common mode signal separator of claim 1, wherein the seventh resistor is matched to an internal resistance of a tester to which the fourth common mode output is connected.
3. The differential-and-common mode signal separator according to claim 1, further comprising a third resistor and a fourth ground, the third resistor being connected between the isolation element and the fourth ground, the third resistor matching an internal resistance of a tester to which the fourth differential mode output terminal is connected.
4. The differential-mode and common-mode signal separator according to claim 1, wherein the isolation element comprises an inductor or a plurality of inductors connected in series, and the first pin and the third pin belong to different windings in the same inductor and have the same polarity.
5. The differential-and-common mode signal separator of claim 4, wherein the common mode signal rejection bands of the plurality of inductors are different.
6. An artificial power network system, comprising:
the artificial power supply network is provided with a live wire input end for connecting a live wire, a ground input end for connecting the ground and a zero line input end for connecting a zero line, and is provided with a first output end, a second output end, a third output end, a fourth output end and a fifth output end, wherein the third output end, the fourth output end and the fifth output end are used for outputting differential mode signals and common mode signals to the tested electronic equipment;
the differential-and-common mode signal separator of any one of claims 1-5; and
the switching circuit is provided with a first connecting path and a second connecting path which can be switched, the first connecting path is used for enabling the first output end and the second output end of the artificial power supply network to be output without passing through the difference-common mode signal separator, and the second connecting path is used for enabling the first output end and the second output end of the artificial power supply network to be connected to the tenth input end and the eleventh input end of the difference-common mode signal separator.
7. The artificial power network system according to claim 6, wherein the second connection path is further for connecting a third differential mode output terminal and a third common mode output terminal of the differential-and-common mode signal separator to ground, respectively.
8. The artificial power network system of claim 6 wherein the first connection path is further for connecting a third differential mode output and a third common mode output of the differential-mode and common-mode signal splitter to a first test pin and a second test pin.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112578191A (en) * | 2020-12-25 | 2021-03-30 | 中汽研汽车检验中心（天津）有限公司 | New energy vehicle and component electromagnetic compatibility performance test system |
| CN112666414A (en) * | 2020-12-16 | 2021-04-16 | 北京航天微电科技有限公司 | Differential mode and common mode interference separator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666414A (en) * | 2020-12-16 | 2021-04-16 | 北京航天微电科技有限公司 | Differential mode and common mode interference separator |
| CN112666414B (en) * | 2020-12-16 | 2023-10-27 | 北京航天微电科技有限公司 | Differential mode common mode interference separator |
| CN112578191A (en) * | 2020-12-25 | 2021-03-30 | 中汽研汽车检验中心（天津）有限公司 | New energy vehicle and component electromagnetic compatibility performance test system |
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