A single phase common mode interference separation system

Abstract

The utility model discloses a single -phase common mode interference separation system, including the live wire port, zero line port, first load port, second load port, first power supply network, second power supply network, capacitor CA, capacitor CB and resistance RA. This technical scheme in the utility model discloses utilizes coupling capacitor CA and coupling capacitor CB respectively to extract the electromagnetic interference of live wire and zero line of the electric load, and this electromagnetic interference includes common mode component and differential mode component, and the one end of coupling capacitor CA is short -circuited with the one end of coupling capacitor CB to eliminate its differential mode component, and the common mode component in electromagnetic interference is separated in this way, and need not change the circuit structure of V type artificial power supply network, and is easy to realize.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field more particularly, the utility model relates to a single phase common mode interference separation system. BACKGROUND

[0002] V-type artificial power network (V-AMN) is the necessary measuring equipment in the electromagnetic compatibility conducted interference test of electronic and electrical products, and its functions include coupling the conducted interference voltage signal of the EUT power port to the measuring receiver, providing impedance matching for the measurement line, providing power supply path for the EUT, and isolating the power supply interference. Generally, the electromagnetic interference measured by the V-type artificial power network is the asymmetric interference voltage of the EUT power port, which contains both common mode interference and differential mode interference. In electromagnetic compatibility diagnosis and optimization design, in order to make the design targeted, it is necessary to determine the type of interference voltage and develop design schemes for common mode interference and differential mode interference respectively. Therefore, it is necessary to separate the common mode interference voltage from the interference voltage measured by the V-type artificial power network in engineering practice.

[0003] The method for separating single-phase differential common mode interference in the prior art is based on the modification of the V-type artificial power network, which needs to change the design structure of the traditional V-type artificial power network, and it is very difficult to change the design structure of the existing equipment, and it is also easy to damage the standard V-type artificial power network. SUMMARY

[0004] To solve the above technical problems, the purpose of the utility model is to provide a single-phase common mode interference separation system.

[0005] The technical scheme adopted by the utility model to solve the problems is:

[0006] A single-phase common mode interference separation system, comprising:

[0007] A hot line port for connecting with the hot line of AC mains;

[0008] A neutral line port for connecting with the neutral line of AC mains;

[0009] A first load port and a second load port for connecting with the electrical load;

[0010] A first power network, a second power network, a capacitor CA, a capacitor CB, and a resistor RA;

[0011] The firewire port and the first load port are connected with the first power supply network respectively, the zero line port and the second load port are connected with the second power supply network respectively, the first load port is connected with one end of the capacitor CA, the second load port is connected with one end of the capacitor CB, the other end of the capacitor CA and the other end of the capacitor CB are connected together and connected with the ground through the resistor RA.

[0012] As a further improvement of the above technical solution, the first power supply network comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an inductor L1, the firewire port is connected with the ground through the capacitor C1 and the resistor R1 in sequence, one end of the inductor L1 is connected with the firewire port, the other end of the inductor L1 is connected with the ground through the capacitor C2 and the resistor R2 in sequence, and the first load port is connected at the connecting point of the inductor L1 and the capacitor C2.

[0013] As a further improvement of the above technical solution, the second power supply network comprises a resistor R3, a resistor R4, a capacitor C3, a capacitor C4 and an inductor L2, the zero line port is connected with the ground through the capacitor C3 and the resistor R3 in sequence, one end of the inductor L2 is connected with the zero line port, the other end of the inductor L2 is connected with the ground through the capacitor C4 and the resistor R4 in sequence, and the second load port is connected at the connecting point of the inductor L2 and the capacitor C4.

[0014] As a further improvement of the above technical solution, the capacitance of the capacitor CA is consistent with the capacitance of the capacitor CB, the capacitance of the capacitor CA and the capacitance of the capacitor CB are both 10nF, and the resistance of the resistor RA is 50Ω.

[0015] As a further improvement of the above technical solution, the resistance of the resistor R1 and the resistance of the resistor R3 are both 5Ω, the resistance of the resistor R2 and the resistance of the resistor R4 are both 50Ω, the capacitance of the capacitor C1 and the capacitance of the capacitor C3 are both 8uF, the capacitance of the capacitor C2 and the capacitance of the capacitor C4 are both 10nF, and the inductance of the inductor L1 and the inductance of the inductor L2 are both 50uH.

[0016] The beneficial effect of the present application is that: in the technical solution, the electromagnetic interference of the firewire and the zero line of the electric load is extracted by the coupling capacitor CA and the coupling capacitor CB, the electromagnetic interference includes common mode component and differential mode component, one end of the coupling capacitor CA is short-circuited with one end of the coupling capacitor CB to eliminate the differential mode component, the common mode component in the electromagnetic interference is separated out, the circuit structure of the V-shaped artificial power supply network is not changed, the application is easy to realize and the application cost is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further explained and described in connection with the description and specific embodiments of the drawings.

[0018] Figure 1 It is the circuit schematic diagram of the utility model. Specific implementation

[0019] This part will describe the specific embodiments of the utility model in detail, the preferred embodiments of the utility model are shown in the drawings, the role of the drawings is to supplement the description of the written part with graphics, so that people can intuitively and visually understand each technical feature and overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0020] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model.

[0021] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are not included in the number, above, below, etc. are understood as including the number.If there is a description to the first, the second is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be interpreted broadly, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0022] Referring to Figure 1 The application discloses a single-phase common-mode interference separation system, which comprises a first embodiment.

[0023] A live wire port is used for being connected with a live wire of an alternating current mains;

[0024] A neutral wire port is used for being connected with a neutral wire of the alternating current mains;

[0025] A first load port and a second load port are used for being connected with an electric load;

[0026] A first power supply network, a second power supply network, a capacitor CA, a capacitor CB and a resistor RA, wherein the capacitor CA and the capacitor CB are used as coupling capacitors;

[0027] The live wire port and the first load port are connected to the first power supply network respectively, the zero wire port and the second load port are connected to the second power supply network respectively, the first load port is connected to one end of the capacitor CA, the second load port is connected to one end of the capacitor CB, the other end of the capacitor CA and the other end of the capacitor CB are connected together and connected to the ground through the resistor RA.

[0028] Specifically, in the embodiment, the coupling capacitor CA and the coupling capacitor CB are used to extract the electromagnetic interference of the live wire and the zero wire of the load, the electromagnetic interference includes common mode component and differential mode component, one end of the coupling capacitor CA is short-circuited with one end of the coupling capacitor CB to eliminate the differential mode component, so that the common mode component in the electromagnetic interference is separated out, and the circuit structure of the V-shaped artificial power supply network does not need to be changed, and the implementation is easy.

[0029] In practical application, through repeated tests for many times, it is summarized that the embodiment can realize the function of extracting common mode interference without attenuation, and realize the function of attenuating differential mode interference by more than 30dB.

[0030] As a further preferred embodiment, in the embodiment, the first power supply network includes a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an inductor L1, the live wire port is connected to the ground through the capacitor C1 and the resistor R1 in sequence, one end of the inductor L1 is connected to the live wire port, the other end of the inductor L1 is connected to the ground through the capacitor C2 and the resistor R2 in sequence, and the first load port is connected to the connection point of the inductor L1 and the capacitor C2.

[0031] As a further preferred embodiment, in the embodiment, the second power supply network includes a resistor R3, a resistor R4, a capacitor C3, a capacitor C4 and an inductor L2, the zero wire port is connected to the ground through the capacitor C3 and the resistor R3 in sequence, one end of the inductor L2 is connected to the zero wire port, the other end of the inductor L2 is connected to the ground through the capacitor C4 and the resistor R4 in sequence, and the second load port is connected to the connection point of the inductor L2 and the capacitor C4.

[0032] In practical application, the resistor RA, the resistor R2 and the resistor R4 in the embodiment are the internal resistance of a test receiver, and the embodiment needs to separate them out from the test receiver in order to more completely illustrate the structure of the system.

[0033] As a further preferred embodiment, in the embodiment, the capacitance of the capacitor CA is consistent with the capacitance of the capacitor CB, the capacitance of the capacitor CA and the capacitance of the capacitor CB are both 10nF, and the resistance of the resistor RA is 50Ω.

[0034] Further as the preferred implementation, in the embodiment, the resistance R1 and the resistance R3 are both 5Ω, the resistance R2 and the resistance R4 are both 50Ω, the capacitance C1 and the capacitance C3 are both 8uF, the capacitance C2 and the capacitance C4 are both 10nF, and the inductance L1 and the inductance L2 are both 50uH.

[0035] The above are only preferred embodiments of the present application, and do not limit the patent range of the present application, and any equivalent structural transformation, direct or indirect application in other related technical fields under the concept of the present application, using the content of the present application specification and drawings, are included in the patent protection range of the present application.

Claims

1. A single phase common mode interference separation system, characterized by, Comprise: a live wire port for connecting with a live wire of an alternating current mains; a neutral wire port for connecting with a neutral wire of the alternating current mains; a first load port and a second load port for connecting with an electrical load; a first power supply network, a second power supply network, a capacitor CA, a capacitor CB and a resistor RA; the live wire port and the first load port are connected with the first power supply network respectively, the neutral wire port and the second load port are connected with the second power supply network respectively, the first load port is connected with one end of the capacitor CA, the second load port is connected with one end of the capacitor CB, the other end of the capacitor CA and the other end of the capacitor CB are connected together and connected with a ground terminal through the resistor RA.

2. A single phase common mode interference separation system as claimed in claim 1, characterized in that, the first power supply network comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an inductor L1, the live wire port is connected with the ground terminal through the capacitor C1 and the resistor R1 in sequence, one end of the inductor L1 is connected with the live wire port, the other end of the inductor L1 is connected with the ground terminal through the capacitor C2 and the resistor R2 in sequence, the first load port is connected at the connection point of the inductor L1 and the capacitor C2.

3. A single phase common mode interference separation system according to claim 2, characterized in that, the second power supply network comprises a resistor R3, a resistor R4, a capacitor C3, a capacitor C4 and an inductor L2, the neutral wire port is connected with the ground terminal through the capacitor C3 and the resistor R3 in sequence, one end of the inductor L2 is connected with the neutral wire port, the other end of the inductor L2 is connected with the ground terminal through the capacitor C4 and the resistor R4 in sequence, the second load port is connected at the connection point of the inductor L2 and the capacitor C4.

4. A single phase common mode interference separation system as claimed in claim 3, characterized in that the capacitance of the capacitor CA is consistent with the capacitance of the capacitor CB, the capacitance of the capacitor CA and the capacitance of the capacitor CB are both 10nF, and the resistance of the resistor RA is 50Ω.

5. A single phase common mode interference separation system as claimed in claim 3, wherein, the resistance of the resistor R1 and the resistance of the resistor R3 are both 5Ω, the resistance of the resistor R2 and the resistance of the resistor R4 are both 50Ω, the capacitance of the capacitor C1 and the capacitance of the capacitor C3 are both 8uF, the capacitance of the capacitor C2 and the capacitance of the capacitor C4 are both 10nF, and the inductance of the inductor L1 and the inductance of the inductor L2 are both 50uH.

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