CN219179481U - Single-phase common mode disturbance voltage measurement module - Google Patents
Single-phase common mode disturbance voltage measurement module Download PDFInfo
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- CN219179481U CN219179481U CN202223164367.6U CN202223164367U CN219179481U CN 219179481 U CN219179481 U CN 219179481U CN 202223164367 U CN202223164367 U CN 202223164367U CN 219179481 U CN219179481 U CN 219179481U
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Abstract
The utility model discloses a single-phase common mode disturbance voltage measurement module, which comprises a shielding shell and an internal circuit, wherein a 3P socket, a first N-type female head, a second N-type female head and a power filter socket are arranged on the shielding shell; the internal circuit includes the first branch road that connects that is used for connecting the L line of 3P socket and first N type female head and the second branch road that is used for connecting the N line of 3P socket and second N type female head, and first branch road is including electric capacity C1, electric capacity C2 and the resistance R1 that establish ties in proper order, and electric capacity C2's one end and the inner conductor electricity of first N type female head are kept away from to resistance R1, and electric capacity C1 keeps away from electric capacity C2's one end and is connected with 3P socket's L line electricity. The utility model has simple internal structure, strong practicability and stronger anti-interference capability, can display the common mode disturbance voltage value of the L line or the N line of the measured sample with single-phase power supply in real time by being matched with the electromagnetic interference measuring receiver, has good use effect and is convenient for popularization and use in an electromagnetic compatibility laboratory.
Description
Technical Field
The utility model belongs to the technical field of common mode disturbance voltage measurement, and particularly relates to a single-phase common mode disturbance voltage measurement module.
Background
Common mode disturbance voltage is the radio frequency voltage between the electrical midpoint of two wires and the reference ground, or the vector sum of the effective disturbance voltages of the whole bundle of wires measured with a current clamp (current transformer) with respect to the reference ground for a bundle of wires under a specified termination impedance condition, and is a metrology term.
When the power port conduction disturbance voltage test is generally carried out in an electromagnetic compatibility laboratory, an artificial power network is required to be used as a coupling network, and the common mode conduction disturbance voltage on a power cable of a sample to be tested is coupled to an electromagnetic interference measurement receiver, so that a common mode conduction disturbance voltage value on a certain power cable of the sample to be tested is obtained. The common mode conduction disturbance voltage test needs to be carried out in an anechoic chamber or a shielding chamber, has high requirements on the background electromagnetic noise of a field, and generally cannot be carried out on the field where the tested sample is located. The artificial power supply network used for the common mode conduction disturbance voltage test is more in variety and mainly comprises a V-type network and a delta-type network, but the internal structures of the two networks are complex, and the measurement cost is higher. Therefore, there is a need for a single-phase common mode disturbance voltage measurement module with low measurement site requirements and simple internal structure.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides the single-phase common mode disturbance voltage measurement module which has the advantages of simple internal structure, convenient use and operation, strong practicability and stronger anti-interference capability, can display the common mode disturbance voltage value of the L line or the N line of the measured sample with single-phase power supply in real time by matching with an electromagnetic interference measurement receiver, has good use effect, and is convenient for popularization and use in an electromagnetic compatibility laboratory.
In order to solve the technical problems, the utility model adopts the following technical scheme: a single-phase common mode disturbance voltage measurement module is characterized in that: the device comprises a shielding shell and an internal circuit, wherein a 3P socket used for being connected with a single-phase tested sample, a first N-type female head and a second N-type female head used for leading out signals of the internal circuit, and a power filter socket are arranged on the shielding shell; the L line of the 3P socket is electrically connected with the L line of the power filter socket, and the N line of the 3P socket is electrically connected with the N line of the power filter socket;
the internal circuit comprises a first connecting branch used for connecting an L line of the 3P socket with a first N-type female connector and a second connecting branch used for connecting an N line of the 3P socket with a second N-type female connector, wherein the first connecting branch comprises a capacitor C1, a capacitor C2 and a resistor R1 which are sequentially connected in series, one end of the resistor R1, far away from the capacitor C2, is electrically connected with an inner conductor of the first N-type female connector, one end of the capacitor C1, far away from the capacitor C2, is electrically connected with the L line of the 3P socket, and a resistor R2 is connected between the inner conductor of the first N-type female connector and an outer shielding shell; the second connecting branch comprises a capacitor C3, a capacitor C4 and a resistor R3 which are sequentially connected in series, one end of the resistor R3, which is far away from the capacitor C4, is electrically connected with an inner conductor of the second N-type female connector, one end of the capacitor C3, which is far away from the capacitor C4, is electrically connected with an N line of the 3P socket, and the resistor R4 is connected between the inner conductor of the second N-type female connector and the outer shielding shell.
The single-phase common mode disturbance voltage measurement module is characterized in that: the capacitance values of the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are 22nF, the resistance values of the resistor R1 and the resistor R3 are 1.5kΩ, and the resistance values of the resistor R2 and the resistor R4 are 1.2kΩ.
The single-phase common mode disturbance voltage measurement module is characterized in that: and the PE wires of the 3P socket and the PE wires of the power filter socket are connected with the shielding shell.
The single-phase common mode disturbance voltage measurement module is characterized in that: the first N-type female head and the second N-type female head are positioned at the top of the shielding shell.
The single-phase common mode disturbance voltage measurement module is characterized in that: the shielding shell is a metal shielding shell.
Compared with the prior art, the utility model has the following advantages:
1. according to the utility model, the internal circuit is arranged and combined with the first N-type female head and the second N-type female head, the circuit structure is simple, the common mode disturbance voltage on the single-phase power supply tested sample power line can be coupled to the electromagnetic interference measurement receiver, the rapid pre-test is realized, the common mode disturbance voltage value of the tested sample at 9 kHz-30 MHz is obtained, and the common mode disturbance voltage value of the tested sample after the filtering measures are applied can be rapidly and intuitively obtained, so that the rectifying and modifying efficiency is improved.
2. The utility model greatly reduces the influence of external interference signals on the measurement result by arranging the shielding shell and the power filter socket, so that the common mode disturbance voltage test operation is not limited by a test site, the common mode disturbance voltage test operation can be performed in an anechoic chamber or a shielding chamber, and can be performed on the site of a sample, thereby facilitating the pre-test and correction work of common mode conduction disturbance on the tested sample with larger volume and weight, and the common mode disturbance voltage test device is flexible to use.
In conclusion, the electromagnetic interference measuring device has the advantages of simple internal structure, convenience in use and operation, strong practicability and strong anti-interference capability, and can display the common mode disturbance voltage value of the L line or the N line of the measured sample with single-phase power supply in real time by matching with the electromagnetic interference measuring receiver, so that the electromagnetic interference measuring device has a good use effect and is convenient for popularization and use in an electromagnetic compatibility laboratory.
The technical scheme of the utility model is further described in detail through the drawings and the embodiments.
Drawings
Fig. 1 is a schematic circuit diagram of the present utility model.
Fig. 2 is a schematic structural view of a shielding case used in the present utility model.
Reference numerals illustrate:
4-a second N-type female head; 5-power filter receptacle.
Detailed Description
As shown in fig. 1 and 2, the utility model comprises a shielding shell 1 and an internal circuit, wherein a 3P socket 2 for connecting with a single-phase tested sample, a first N-type female head 3 and a second N-type female head 4 for leading out signals of the internal circuit, and a power filter socket 5 are arranged on the shielding shell 1; the L line of the 3P socket 2 is electrically connected with the L line of the power filter socket 5, and the N line of the 3P socket 2 is electrically connected with the N line of the power filter socket 5;
the internal circuit comprises a first connecting branch used for connecting an L line of the 3P socket 2 with the first N-type female connector 3 and a second connecting branch used for connecting an N line of the 3P socket 2 with the second N-type female connector 4, the first connecting branch comprises a capacitor C1, a capacitor C2 and a resistor R1 which are sequentially connected in series, one end of the resistor R1, far away from the capacitor C2, is electrically connected with an inner conductor of the first N-type female connector 3, one end of the capacitor C1, far away from the capacitor C2, is electrically connected with the L line of the 3P socket 2, and a resistor R2 is connected between the inner conductor of the first N-type female connector 3 and an outer shielding shell; the second connection branch comprises a capacitor C3, a capacitor C4 and a resistor R3 which are sequentially connected in series, one end of the resistor R3, which is far away from the capacitor C4, is electrically connected with an inner conductor of the second N-type female connector 4, one end of the capacitor C3, which is far away from the capacitor C4, is electrically connected with an N line of the 3P socket 2, and the resistor R4 is connected between the inner conductor of the second N-type female connector 4 and an outer shielding shell.
In this embodiment, the internal circuit is integrated on a circuit board inside the shield case 1.
As shown in fig. 1, the first N-type female head 3 is represented by two circles, the inner circle is an inner conductor of the first N-type female head 3, the outer circle is an outer shielding shell of the first N-type female head 3, and the second N-type female head 4 has the same structure as the first N-type female head 3.
The internal circuit is arranged and combined with the first N-type female head 3 and the second N-type female head 4, so that the circuit structure is simple, the common mode disturbance voltage on a single-phase power supply tested sample power line can be coupled to an electromagnetic interference measurement receiver, the quick pre-test is realized, the common mode disturbance voltage value of the tested sample at 9 kHz-30 MHz is obtained, and the common mode disturbance voltage value of the tested sample after the filtering measures are applied can be quickly and intuitively obtained, so that the rectifying and modifying efficiency is improved;
the influence of external interference signals on a measurement result is greatly reduced by arranging the shielding shell 1 and the power filter socket 5, so that the common mode disturbance voltage test operation is not limited by a test site, the common mode disturbance voltage test operation can be performed in an anechoic chamber or a shielding chamber, and can be performed on the site of a sample, thereby facilitating the pre-test and correction work of common mode conduction disturbance on the tested sample with larger volume and weight, and the common mode disturbance voltage test device is flexible to use.
When the utility model is in practical use, a common three-wire power line is inserted into the power filter socket 5, the power line is connected with a commercial power grid, a plug of a tested sample is inserted into the 3P socket 2, and the tested sample is started to be in a working state required by an authentication test. When the common mode disturbance voltage of the L line of the measured sample is required to be measured, the electromagnetic interference measuring receiver is connected to the first N-type female head 3 through the coaxial cable, when the common mode disturbance voltage of the N line of the measured sample is required to be measured, the measuring receiver is connected to the second N-type female head 4 through the coaxial cable, the electromagnetic interference measuring receiver displays the measured voltage value, and the common mode disturbance voltage value of the L line or the N line of the measured sample can be obtained through data conversion, so that the use effect is good.
In this embodiment, the capacitance values of the capacitor C1, the capacitor C2, the capacitor C3, and the capacitor C4 are all 22nF, the resistance values of the resistor R1 and the resistor R3 are all 1.5kΩ, and the resistance values of the resistor R2 and the resistor R4 are all 1.2kΩ.
It should be noted that, two series-connected 22nF capacitors are used for isolating the direct current signal, the total resistance between the L line or the N line of the power line and the PE line is 1.5kΩ, and after the electromagnetic interference measuring receiver with characteristic impedance of 50Ω is connected to the first N-type female terminal 3 or the second N-type female terminal 4, the common mode disturbance voltage v= (1500/50) ×u of the measured sample is the voltage value measured by the electromagnetic interference measuring receiver.
In this embodiment, the PE line of the 3P jack 2 and the PE line of the power filter jack 5 are connected to the shielding shell 1.
In this embodiment, the first N-type female connector 3 and the second N-type female connector 4 are located at the top of the shielding shell 1.
In this embodiment, the shielding shell 1 is a metal shielding shell.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.
Claims (5)
1. A single-phase common mode disturbance voltage measurement module is characterized in that: the device comprises a shielding shell (1) and an internal circuit, wherein a 3P socket (2) used for being connected with a single-phase tested sample, a first N-type female head (3) and a second N-type female head (4) used for leading out signals of the internal circuit, and a power filter socket (5) are arranged on the shielding shell (1); the L line of the 3P socket (2) is electrically connected with the L line of the power filter socket (5), and the N line of the 3P socket (2) is electrically connected with the N line of the power filter socket (5);
the internal circuit comprises a first connecting branch used for connecting an L line of the 3P socket (2) with a first N-type female connector (3) and a second connecting branch used for connecting an N line of the 3P socket (2) with a second N-type female connector (4), wherein the first connecting branch comprises a capacitor C1, a capacitor C2 and a resistor R1 which are sequentially connected in series, one end of the resistor R1 far away from the capacitor C2 is electrically connected with an inner conductor of the first N-type female connector (3), one end of the capacitor C1 far away from the capacitor C2 is electrically connected with the L line of the 3P socket (2), and a resistor R2 is connected between the inner conductor of the first N-type female connector (3) and an outer shielding shell; the second connecting branch comprises a capacitor C3, a capacitor C4 and a resistor R3 which are sequentially connected in series, one end of the resistor R3, which is far away from the capacitor C4, is electrically connected with an inner conductor of the second N-type female connector (4), one end of the capacitor C3, which is far away from the capacitor C4, is electrically connected with an N line of the 3P socket (2), and the resistor R4 is connected between the inner conductor of the second N-type female connector (4) and the outer shielding shell.
2. A single phase common mode disturbance voltage measurement module according to claim 1, wherein: the capacitance values of the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are 22nF, the resistance values of the resistor R1 and the resistor R3 are 1.5kΩ, and the resistance values of the resistor R2 and the resistor R4 are 1.2kΩ.
3. A single phase common mode disturbance voltage measurement module according to claim 1, wherein: PE wires of the 3P socket (2) and PE wires of the power filter socket (5) are connected with the shielding shell (1).
4. A single phase common mode disturbance voltage measurement module according to claim 1, wherein: the first N-type female head (3) and the second N-type female head (4) are positioned at the top of the shielding shell (1).
5. A single phase common mode disturbance voltage measurement module according to claim 1, wherein: the shielding shell (1) is a metal shielding shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223164367.6U CN219179481U (en) | 2022-11-28 | 2022-11-28 | Single-phase common mode disturbance voltage measurement module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223164367.6U CN219179481U (en) | 2022-11-28 | 2022-11-28 | Single-phase common mode disturbance voltage measurement module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219179481U true CN219179481U (en) | 2023-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223164367.6U Active CN219179481U (en) | 2022-11-28 | 2022-11-28 | Single-phase common mode disturbance voltage measurement module |
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| Country | Link |
|---|---|
| CN (1) | CN219179481U (en) |
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- 2022-11-28 CN CN202223164367.6U patent/CN219179481U/en active Active
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