CN211374912U - Large-current linear impedance stabilizing network - Google Patents
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Abstract
The application relates to a high-current linear impedance stabilizing network which comprises an inductor, a first capacitor, a second capacitor, a first resistor and a second resistor; one end of the inductor is connected with the first capacitor in series and then is connected with one end of the first resistor; the other end of the inductor is connected with a second capacitor in series and then is connected with one end of a second resistor; one end of the inductor connected with the first capacitor is used as a live wire contact of the power input interface, one end of the inductor connected with the second capacitor is used as a live wire contact of the power output interface, the other end of the first resistor is connected with the other end of the second resistor to be used as a zero line contact shared by the power input interface and the power output interface, and two ends of the second resistor are respectively led out a line to be used as a contact of an external load. According to the technical scheme, the internal structure of the conventional linear impedance stabilization network is improved, so that the whole weight and the size of the linear impedance stabilization network can be reduced on the basis of supporting a large-current power supply, and the linear impedance stabilization network can be convenient to use, move and carry.
Description
Technical Field
The application relates to the technical field of conduction emission testing, in particular to a high-current linear impedance stabilization network.
Background
LISN (Line Impedance Stabilization Network) is used to simulate a stable Line Impedance that provides a 50 ohm Impedance to the device under test in the radio frequency range. Wherein, the larger the current of the device under test is, the more complicated the internal structure required by the LISN is, resulting in the larger the overall volume.
For example, the current of a conventional electric vehicle at the moment of starting is generally 300 amperes or more, and a specific high-current vehicle LISN is required for testing such a power supply. At present, similar high-current automobile LISN does not exist in China, products generally used by people are foreign, the sizes of the products are huge and heavy, the requirements on sites are high when the products are used, and the products are not convenient to move or carry in the foreign field.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present application provides a high current linear impedance stabilization network, so as to reduce the volume and weight thereof by improving the internal structure of the linear impedance stabilization network, and to facilitate the use, movement and carrying thereof.
The above object of the present application is achieved by the following technical solutions:
the embodiment of the application provides a linear impedance stabilization network of heavy current, includes: the circuit comprises an inductor, a first capacitor, a second capacitor, a first resistor and a second resistor;
one end of the inductor is connected with one end of the first resistor after being connected with the first capacitor in series to form a first low-pass filter for filtering high-frequency harmonic waves accessed into a power supply;
the other end of the inductor is connected with one end of the second resistor after being connected with the second capacitor in series to form a second low-pass filter for filtering interference voltage of the tested equipment;
the inductor is connected with one end of the first capacitor and used as a live wire contact of the power input interface, one end of the inductor connected with the second capacitor is used as a live wire contact of the power output interface, the other end of the first resistor is connected with the other end of the second resistor and used as a zero line contact shared by the power input interface and the power output interface, and two ends of the second resistor are respectively led out to form a line as a contact of an external load.
Optionally, the high-current linear impedance stabilizing network further includes a housing; the inductor, the first capacitor, the second capacitor, the first resistor and the second resistor are all arranged in the shell;
the shell comprises a power input interface, a power output interface, a detection port and a grounding column, wherein the power input interface and the power output interface at least comprise a live wire end and a zero line end, the live wire end and the zero line end are used for connecting corresponding live wire contact points or zero line contact points, and the detection port is used for externally connecting a load or test equipment.
Optionally, the power output interface, the detection port and the ground post are disposed on a front panel of the housing, and the power input interface is disposed on a rear panel of the housing.
Optionally, the inductor is made of oxygen-free copper.
Optionally, the number of turns of the inductor is 15, and the inductance is 50 microhenries.
Optionally, the coil of the inductor is a cylindrical coil, and the height of the cylinder is 285 mm.
Optionally, a capacitance value of the first capacitor is 1 microfarad, a capacitance value of the second capacitor is 0.1 microfarad, a resistance value of the first resistor is 1 ohm, and a resistance value of the second resistor is 1 kilo-ohm.
Optionally, both ends of the inductor include threads, so as to facilitate external connection of equipment.
Optionally, the length of the thread is 72 mm.
Optionally, the detection port is an N-type detection port or a BNC-type detection port.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
in the technical scheme provided by the embodiment of the application, the internal structure of the conventional linear impedance stabilization network is improved, namely, the quantity of the inductor, the capacitor and the resistor is reduced, and meanwhile, the connection relation of circuit elements is optimized, so that the whole weight and the size of the linear impedance stabilization network can be reduced on the basis of supporting a large-current power supply, and the linear impedance stabilization network is convenient to use, move and carry and has higher practicability.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic circuit structure diagram of a large-current linear impedance stabilizing network according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an inductor according to an embodiment of the present disclosure;
fig. 3 is a schematic external structural diagram of a high-current linear impedance stabilization network according to an embodiment of the present disclosure;
fig. 4 is an equivalent circuit schematic diagram of a high-current linear impedance stabilizing network according to an embodiment of the present application;
fig. 5 is an equivalent circuit schematic diagram of another high-current linear impedance stabilization network provided in the embodiment of the present application;
FIG. 6 is a schematic diagram of a process for calibrating an instrument according to an embodiment of the present disclosure;
fig. 7 is a schematic wiring diagram of a through test process according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a coupling test process according to an embodiment of the present disclosure;
fig. 9 is a schematic wiring diagram of an output impedance testing process according to an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Before explaining the technical solution of the present application, a main purpose of the Linear Impedance Stabilization Network (LISN) is briefly explained.
The nature of LISN is a coupling and decoupling circuit that has three main roles in conducted emission testing:
(1) providing a stable impedance (50 omega) to the power input of the product under test in the LISN operating frequency range;
(2) coupling interference voltage input by a power supply of a product to be tested to electromagnetic compatibility testing equipment;
(3) the interference voltage of the power supply input end of the tested product is isolated from the interference voltage of the power supply end, the interference voltage of the power supply end is prevented from being coupled into the electromagnetic compatibility testing equipment to cause damage to the testing equipment, and meanwhile the interference voltage input by the power supply of the tested product is prevented from being coupled into the power supply to influence the use of other equipment.
In the existing GBT-18655-2010 specification, a detailed test method and test conditions are definitely specified for a conduction emission test, and a small and compact large-current LISN is designed according to the test rule of the specification. It should be noted that, at present, the starting current of the electric vehicle battery is the largest of the currents that can be achieved in similar power supply devices, so the LISN can also meet the use requirements of other occasions as long as the LISN meets the use requirements of the electric vehicle battery, and based on this, in the following description, the electric vehicle battery will be taken as an example when referring to a power supply.
Examples
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a large-current linear impedance stabilizing network according to an embodiment of the present disclosure. As shown in fig. 1, the high current linear impedance stabilization network includes: inductor L and first capacitor C2A second capacitor C1A first resistor R3And a second resistor R1；
One end of the inductor L is connected in series with the first capacitor C2Rear and first resistor R3One end of the first low-pass filter is connected to form a first low-pass filter which is used for filtering high-frequency harmonic waves accessed into a power supply and preventing the power supply noise from interfering the tested equipment;
the other end of the inductor L is connected in series with a second capacitor C1Rear and second resistors R1One end of the first low-pass filter is connected to form a second low-pass filter which is used for filtering the interference voltage of the tested equipment and preventing the high-frequency interference voltage of the tested equipment from influencing the power supply;
inductor L and first capacitor C2One end of the inductor L is used as a live wire contact of the power input interface, and the inductor L and the second capacitor C are connected1One end of the first resistor R is connected with the power output interface and serves as a live wire contact of the power output interface3And the other end of the first resistor and a second resistor R1The other end of the first resistor is connected with a zero line contact used as the common use of the power input interface and the power output interface, and a second resistor R1Two ends of the load are respectively led out a line as an external load R2The contact of (1).
Since the weight and volume of the inductor are large in proportion to the weight and volume of the LISN, improvement of the inductor is a key factor in reducing the weight and volume of the LISN. In the traditional LISN, in order to meet the use requirement on large current, a plurality of inductors, a large number of capacitors and resistors are usually involved, and in the technical scheme of the application, the number of the inductors is reduced to one through the optimization and improvement of an inductor structure and other circuit structures, and the number of the capacitors and the resistors is reduced, so that the weight and the volume of the LISN are reduced on the basis of ensuring that a large-current power supply can be supported. On the other hand, the selection of the inductor material also has an influence on the inductor performance, and oxygen-free copper can be selected to manufacture the inductor in the embodiment, so that the excellent conductivity of the inductor is ensured.
Specifically, in some embodiments, please refer to fig. 2 for structural parameters of the inductor L, and fig. 2 is a schematic structural diagram of the inductor L according to an embodiment of the present disclosure. As shown in fig. 2, the inductance L is a cylindrical coil, the height of the cylinder is 285mm (mm), the coil has 15 turns, and the corresponding inductance is 50 μ H (microhenries). Of course, it should be understood that the number of turns of the inductor L is not fixed, but the number of turns may be increased or decreased according to actual requirements, and thus the inductance may also be increased or decreased.
In addition to the inductance L, the values of the capacitors and resistors shown in fig. 1 may be: a first capacitor C2Has a capacitance value of 1 muF (microfarad), and a second capacitance C1Has a capacitance of 0.1 muF and a first resistance R3Has a resistance value of 1 omega (ohm), and a second resistor R1The resistance value of (a) is 1K Ω (kilo-ohm).
For the current storage battery of the electric automobile, the LISN made of the inductor L, the capacitor and the resistor corresponding to the values in the embodiment can be used sufficiently.
In addition, as shown in fig. 2, both ends of the inductor L may further include threads to facilitate external connection of devices. Further, the length of the thread may be 72 mm.
In the technical scheme that the embodiment of this application provided, through the inner structure of improvement conventional power impedance stabilization network, reduce the quantity of inductance, electric capacity and resistance promptly to optimize circuit element's relation of connection simultaneously, thereby can alleviate power impedance stabilization network's whole weight and volume on the basis of supporting heavy current power, and then make it can convenient to use, remove and carry, make it have higher practicality.
In addition, when in actual use, the device to be tested and other external devices are convenient to wire, and the circuit elements are prevented from being mistakenly contacted in the using processSurprisingly, on the basis of the above-mentioned circuit, as shown in fig. 3, the LISN usually further comprises a housing 1, so that the inductor L and the first capacitor C are connected together2A second capacitor C1A first resistor R3And a second resistor R1Are disposed within the housing 1. The shell 1 comprises a power input interface (not shown in the figure), a power output interface 2, a detection port 3 and a grounding column 4, wherein the power input interface and the power output interface 2 at least comprise a live wire end and a zero wire end, the live wire end and the zero wire end are used for connecting corresponding live wire connection points or zero wire connection points, the detection port 3 is used for externally connecting a load or test equipment, and the grounding column 4 is connected with the zero wire connection point of an internal circuit. Further, the power output interface 2, the detection port 3 and the ground post 4 are disposed on the front panel of the housing 1, and the power input interface is disposed on the rear panel (not shown) of the housing 1.
The actual type of power input interface and power output interface 2 can be selected from a variety of interface types (e.g., German standard conversion plugs) according to actual needs. The test port 3 may be an N-type test port or a BNC (Bayonet NutConnector) type test port, i.e., the interface type may be an N-type or BNC type. An N-type connector is a medium power connector for threaded connections, typically used to connect radio frequency coaxial cables. A BNC connector is also a connector for coaxial cables, and LISN currently on the market is generally the BNC connector used.
In order to better explain the technical solution of the present application, the following will explain the main performance parameters of the LISN provided by the above embodiments.
The two most important parameters for LISN are insertion loss and output impedance. The insertion loss refers to energy or gain loss when some devices or branch circuits (filters, impedance matchers, etc.) are added to a certain circuit, and for LISN, that is, energy loss caused after the LISN is connected to a test circuit when a conduction emission test is performed.
For the circuit configuration shown in fig. 1, the insertion loss is determined by the coupling capacitance C1And a resistor R1Is connected in series with the 50 omega input impedance of the receiver (namely the test equipment in the conducted transmission test), and the equivalent of the impedance isThe circuit is shown in fig. 4.
The equivalent circuit can calculate the current in the whole circuit as:
from this calculation:
in the above formula, U1The voltage input by the tested device can be directly read when the frequency spectrograph is connected with the power output interface 2 of the LISN, and the U is2Is a second capacitor C1The voltage at the two ends can be directly read out by connecting the frequency spectrograph with the detection port 3 of the LISN. Then the insertion loss (in dB) S-U can be calculated from the above results1/U2. In practice, the insertion loss is usually expressed in logarithmic form, and the conversion logarithm is S20 log (U)1-U2)。
As for the output impedance, as described above, one of the roles of the LISN is to provide a stable impedance (50 Ω) to the power input terminal of the product to be tested in the operating frequency range, and therefore, the accuracy of the output impedance of the LISN is important to design.
The components in the above embodiments determine the output impedance of the LISN. Wherein the second capacitor C1The impedance to 50Hz (low frequency) signals is large and therefore serves to isolate the coupling between the voltage of the power supply (referring to the power supply accessed from the power input interface of the LISN) and the receiver (i.e. the test equipment in conducted transmission tests), but because the impedance to high frequency signals is small, the interference voltage generated by the device under test (i.e. the power supply under test) can be coupled to the receiver. In addition, since R1＝1KΩ>>R250 Ω, so R1And R2When connected in parallel, R1Has little influence on impedance, which only plays a role of giving C1The function of providing a discharge path (i.e. R)1A bleed-off resistor).
An equivalent circuit for calculating the output impedance of the LISN is shown in fig. 5.
To the left of the equivalent circuit (i.e., L, C)2And R3) Is X1Right side (i.e. C)1、R1And R2) Is X2The circuit output impedance Z can be regarded as X1And X2Parallel connection:
wherein,
it can be calculated that,
the above is a principle of designing a circuit structure based on insertion loss and output impedance, and a practical test procedure will be described below. Note that the following description is made based on the LISN detection port being an N-type detection port.
The instrument (spectrum analyzer) may be calibrated first before the test is performed, thereby increasing the accuracy of the test. Referring to fig. 6, fig. 6 is a schematic wiring diagram illustrating an instrument calibration process according to an embodiment of the present disclosure. As shown in fig. 6, the output end of the signal source (power supply) and the input end of the spectrum analyzer are respectively connected to two ends of the T-shaped three-way joint, a standard load of 50 Ω is inserted into the remaining end of the three-way joint, and finally the reading of the spectrum analyzer is adjusted to the standard value. Wherein the three way connection is an N-type three-core connection corresponding to the N-type detection port.
After the instrument calibration is performed, the insertion loss and output impedance can be tested.
The insertion loss test is carried out in two steps, namely, the U in the principle is obtained through a direct connection test1And obtaining U through coupling test2。
Referring to fig. 7, fig. 7 is a schematic wiring diagram illustrating a through test process according to an embodiment of the present disclosure. As shown in fig. 7The output end of a signal source (power supply), the input end of the spectrum analyzer and the power supply output interface 2 of the LISN are respectively connected with the three ends of the three-way joint, a standard load of 50 omega is inserted into a detection port of the LISN, and then the U subjected to logarithmic conversion can be directly read from the spectrum analyzer1。
Referring to fig. 8, fig. 8 is a schematic wiring diagram illustrating a coupling test process according to an embodiment of the present disclosure. As shown in fig. 7, the output end of the signal source (power supply) and the power output interface 2 of the LISN are respectively connected to two ends of the three-way joint, a standard load of 50 Ω is inserted into the remaining end of the three-way joint, and the input end of the spectrometer is connected to the detection port 3 of the LISN, and then the logarithmically converted U can be directly read out from the spectrometer2。
Finally, since the spectrometer displays logarithmically converted readings, the insertion loss s (db) can be calculated by subtracting the two readings.
For testing the output impedance, please refer to fig. 9, and fig. 9 is a schematic wiring diagram of an output impedance testing process according to an embodiment of the present disclosure. As shown in fig. 9, the signal port and the ground post of the network analyzer are respectively connected to the power output interface 2 and the ground post 4 of the LISN, and a standard load of 50 Ω is inserted into the detection port 3 of the LISN, so that the impedance value of the LISN at the required operating frequency can be read by the network analyzer.
Actual tests show that compared with the traditional LISN, the technical scheme of the application reduces the insertion loss and improves the accuracy of the output impedance.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A high current linear impedance stabilization network, comprising: the circuit comprises an inductor, a first capacitor, a second capacitor, a first resistor and a second resistor;
one end of the inductor is connected with one end of the first resistor after being connected with the first capacitor in series to form a first low-pass filter for filtering high-frequency harmonic waves accessed into a power supply;
the other end of the inductor is connected with one end of the second resistor after being connected with the second capacitor in series to form a second low-pass filter for filtering interference voltage of the tested equipment;
the inductor is connected with one end of the first capacitor and used as a live wire contact of the power input interface, one end of the inductor connected with the second capacitor is used as a live wire contact of the power output interface, the other end of the first resistor is connected with the other end of the second resistor and used as a zero line contact shared by the power input interface and the power output interface, and two ends of the second resistor are respectively led out to form a line as a contact of an external load.
2. The high current linear impedance stabilization network of claim 1, further comprising a housing; the inductor, the first capacitor, the second capacitor, the first resistor and the second resistor are all arranged in the shell;
the shell comprises a power input interface, a power output interface, a detection port and a grounding column, wherein the power input interface and the power output interface at least comprise a live wire end and a zero line end, the live wire end and the zero line end are used for connecting corresponding live wire contact points or zero line contact points, and the detection port is used for externally connecting a load or test equipment.
3. The high current linear impedance stabilization network of claim 2, wherein said power output interface, said detection port and said ground post are disposed on a front panel of said housing, and said power input interface is disposed on a rear panel of said housing.
4. The high current linear impedance stabilization network of claim 1, wherein said inductor material is oxygen free copper.
5. The high current linear impedance stabilization network of claim 4, wherein said inductor has 15 turns and an inductance of 50 microhenries.
6. The high current linear impedance stabilization network of claim 5, wherein the windings of said inductors are cylindrical windings, and the height of the cylinders is 285 mm.
7. The high current linear impedance stabilization network of claim 5, wherein said first capacitor has a capacitance of 1 microfarad, said second capacitor has a capacitance of 0.1 microfarad, said first resistor has a resistance of 1 ohm, and said second resistor has a resistance of 1 kilo-ohm.
8. The high current linear impedance stabilization network of claim 4, wherein both ends of said inductor comprise threads to facilitate external connection to a device.
9. The high current linear impedance stabilization network of claim 8, wherein said threads are 72 millimeters in length.
10. The high current linear impedance stabilization network of claim 2, wherein said sensing port is an N-type sensing port or a BNC-type sensing port.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740640A (en) * | 2021-08-18 | 2021-12-03 | 西安交通大学 | Line impedance stabilization network structure suitable for pulse current injection |
| CN114336940A (en) * | 2021-12-30 | 2022-04-12 | 广电计量检测（成都）有限公司 | Power stabilizing device capable of being used for military product test |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740640A (en) * | 2021-08-18 | 2021-12-03 | 西安交通大学 | Line impedance stabilization network structure suitable for pulse current injection |
| CN114336940A (en) * | 2021-12-30 | 2022-04-12 | 广电计量检测（成都）有限公司 | Power stabilizing device capable of being used for military product test |
| CN114336940B (en) * | 2021-12-30 | 2024-05-31 | 广电计量检测（成都）有限公司 | Power supply stabilizing device for product test |
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