Radio frequency conducted interference coupling and decoupling network device

Abstract

The invention provides a radio frequency conducted interference coupling and decoupling network device, and relates to the technical field of electrical measurement compatibility of immunity measurement. A radio frequency conducted interference coupling and decoupling network device comprises a radio frequency signal transmitter used for transmitting a radio frequency conducted interference signal; the alternating current power supply end is used for supplying power to the to-be-tested equipment; the coupling network comprises a three-phase four-wire coupling network and a three-phase five-wire coupling network and is used for dividing the radio frequency conducted interference signal into four paths of input signals and five paths of input signals, coupling the four paths of input signals to the cable of the alternating current power supply end in parallel and coupling the five paths of input signals to the cable of the alternating current power supply end in parallel; and the decoupling network is arranged between the alternating current power supply end and the coupling network and is used for absorbing radio frequency interference signals in the external environment.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrical compatibility of immunity measurement, and more specifically, to a radio frequency conducted interference coupling and decoupling network device. Background Art

[0002] Radio frequency conducted interference immunity testing is an important part of the electromagnetic compatibility assessment of medical devices, which aims to verify the device's immunity to conducted interference signals induced by electromagnetic radiation. For medical devices, radio frequency conducted interference immunity testing is not only related to the normal operation of the device, but also directly involves the safety of patients and operators. Therefore, ensuring that the device can operate normally in the presence of radio frequency interference is a key factor in the design and production process of medical devices.

[0003] Coupling / decoupling network (CDN) is widely considered the most reliable and optimal choice due to its reliable electrical performance and standardized operation process. The coupling network is used to couple the RF signal to the power line to simulate the electromagnetic interference in the actual working environment; while the decoupling network is used to absorb the RF signal and reduce the conducted interference.

[0004] The medical carbon ion therapy system is a complex and large medical device with a complex structure and a wide variety of components. In particular, the RF conducted interference immunity test of the high-power active devices (rated current greater than 200A) inside the system is particularly critical. However, traditional coupling / decoupling network devices are difficult to meet the needs of these high-power devices, which makes the RF conducted interference immunity test of high-power active devices difficult, limiting the reliability and safety assessment of these devices. Summary of the invention

[0005] In view of this, the present disclosure provides a radio frequency conducted interference coupling and decoupling network device.

[0006] The present disclosure provides a radio frequency conducted interference coupling and decoupling network device, comprising: a radio frequency signal transmitter, used for transmitting a radio frequency conducted interference signal; an alternating current power supply end, used for providing power to a device under test; a coupling network, comprising a three-phase four-wire coupling network and a three-phase five-wire coupling network, used for dividing the radio frequency conducted interference signal into four input signals and five input signals and coupling the four input signals in parallel to a cable at the alternating current power supply end and coupling the five input signals in parallel to a cable at the alternating current power supply end; and a decoupling network, arranged between the alternating current power supply end and the coupling network, used for absorbing radio frequency interference signals in an external environment.

[0007] According to an embodiment of the present disclosure, a three-phase four-wire coupling network includes four branches, and each of the four branches includes a first circuit breaker, a first resistor and a first capacitor connected in series in sequence; wherein the first circuit breaker is used to branch the radio frequency conducted interference signal to obtain four input signals; the first resistor is used to obtain a preset common-mode impedance, and the first capacitor is used to couple the four input signals in parallel.

[0008] According to an embodiment of the present disclosure, one end of each first capacitor in the four branches is respectively connected to the first phase line, the second phase line, the third phase line and the ground line of the AC power supply.

[0009] According to an embodiment of the present disclosure, a three-phase five-wire coupling network includes five branches, and each of the five branches includes a second circuit breaker, a second resistor and a second capacitor connected in series in sequence; wherein the second circuit breaker is used to branch the radio frequency conducted interference signal to obtain five input signals; the second resistor is used to obtain a preset common-mode impedance, and the second capacitor is used to couple the five input signals in parallel.

[0010] According to an embodiment of the present disclosure, one end of each first capacitor in the five branches is respectively connected to the first phase line, the second phase line, the third phase line, the neutral line and the ground line of the AC power supply.

[0011] According to an embodiment of the present disclosure, it also includes: a double switch, one end of the double switch is connected to the radio frequency signal transmitter, and the other end is connected to one end of the first circuit breaker or one end of the second circuit breaker, which is used to control the radio frequency conducted interference signal to flow to the three-phase four-wire coupling network or the three-phase five-wire coupling network.

[0012] According to an embodiment of the present disclosure, the structure of the decoupling network is a clamp-on tube, which is nested on the cable at the AC power supply end.

[0013] According to an embodiment of the present disclosure, the clamp-on tube is a nickel-zinc soft ferrite magnetic ring, and the material of the nickel-zinc soft ferrite magnetic ring includes a NiFe2O4 solid solution and a NiZn2O4 solid solution.

[0014] According to the embodiments of the present disclosure, the relative initial magnetic permeability of the nickel-zinc soft ferrite magnetic ring is 15-70, and the Curie point temperature is 350°C-450°C.

[0015] According to an embodiment of the present disclosure, in the frequency band of 0.15 MHz-24 MHz, the common mode impedance is between 130Ω-170Ω; in the frequency band of 24 MHz-80 MHz, the common mode impedance is between 105Ω-210Ω.

[0016] According to the embodiments of the present disclosure, a modular design is adopted to design the coupling network and the decoupling network separately, which effectively reduces the size of the network device, facilitates carrying, and facilitates the field test arrangement of RF conducted interference of power lines of high-power active devices.

[0017] According to the embodiments of the present disclosure, since the three-phase four-wire coupling network and the three-phase five-wire coupling network technical means are adopted, a flexible selection can be made based on the conditions of the device to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0019] Figure 1 The structure diagram of a network device according to an embodiment of the present disclosure is schematically shown;

[0020] Figure 2 The schematic diagram of the test circuit according to the embodiment of the present disclosure is shown;

[0021] Explanation of the reference numerals: 1. RF signal source; 2. Coupling network; 3. AC power supply terminal; 4. Decoupling network; 5. Device under test; 6. Load. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0023] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0024] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0025] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0026] According to the national standard GB / T 17626.6-2017 "Electromagnetic compatibility test and measurement technology - Immunity to conducted interference induced by radio frequency fields", it is recommended to use a coupling / decoupling network CDN for all power connections. However, for high power (current ≥ 16A) and / or complex power systems (multi-phase or various parallel power supply voltages), the standard also allows the use of other injection methods. However, the standard emphasizes that other injection methods may not meet the requirements of the main parameters of the coupling / decoupling device due to their electrical performance. Therefore, using a coupling / decoupling network (CDN) to couple interference signals to the power line is still a reliable and optimal choice.

[0027] RF conducted interference signals usually refer to the electromagnetic field of the RF transmitter acting on the interconnecting cables of the equipment under test (Equipment Under Test, EUT for short). The input and output lines connected to the EUT may become passive receiving antenna networks and conduction paths for useful and useless signals. Sensitive equipment between cable networks is susceptible to interference currents flowing through the equipment. A coupling network device with a common mode impedance of 150Ω relative to the ground reference plane is used to replace this cable system.

[0028] Figure 1 The diagram schematically shows a structure diagram of a network device according to an embodiment of the present disclosure.

[0029] In some embodiments of the present disclosure, Figure 1 As shown, the RF signal source 1 emits a RF conducted interference signal and transmits the signal to the coupling network device 2, which receives the signal and couples the signal. The AC power supply terminal 3 is used to provide power to the device under test 5, and the decoupling network device 4 is arranged between the AC power supply terminal 3 and the device under test 5. The coupling network device couples the received signal to the cable between the decoupling network device 4 and the device under test 5, and the load 6 is used to simulate the actual working environment for the device under test 5.

[0030] Figure 2 The schematic diagram shows a principle diagram of a test circuit according to an embodiment of the present disclosure.

[0031] In some embodiments of the present disclosure, Figure 2As shown, the radio frequency conducted interference coupling and decoupling network device includes: a radio frequency signal transmitter, used to transmit a radio frequency conducted interference signal; an AC power supply end, used to provide power to the device under test; a coupling network, including a three-phase four-wire coupling network and a three-phase five-wire coupling network, used to divide the radio frequency conducted interference signal into four input signals and five input signals and couple the four input signals in parallel to the cables at the AC power supply end and couple the five input signals in parallel to the cables at the AC power supply end; a decoupling network, arranged between the AC power supply end and the coupling network, used to absorb radio frequency interference signals in the external environment.

[0032] In the embodiments of the present disclosure, by designing a coupling network including a three-phase four-wire coupling network and a three-phase five-wire coupling network, a three-phase four-wire coupling network or a three-phase five-wire coupling network can be selected based on the conditions of the device under test, thereby improving the flexibility of selection in practical applications and facilitating on-site experimental testing. Secondly, the coupling network of the present disclosure couples the RF conducted interference signal and injects it in parallel into the cable between the decoupling network and the device under test, as well as the regional modular design, which effectively solves the operability and test reliability of the on-site test of the conducted immunity of the power line of the high-power active device in the carbon ion therapy system.

[0033] In the related art, for low-power devices under test, the coupling / decoupling device is connected in series to the power supply cable for testing, that is, the power supply at the power supply end passes through the coupling / decoupling device. However, for high-power active devices to conduct conducted immunity tests, it is difficult to achieve operability and safety by connecting the device in series to the power line.

[0034] The modular coupling and decoupling network device adopted in the present invention can conveniently and efficiently complete the application of RF conducted interference signals, ensure the implementation of RF conducted immunity tests, and provide a more effective and convenient testing method for on-site testing of RF conducted interference immunity of power lines of high-power active devices (rated current greater than 200A) in medical carbon ion therapy systems.

[0035] According to an embodiment of the present disclosure, a three-phase four-wire coupling network includes four branches, which are respectively a first circuit breaker S1, a first resistor R1 and a first capacitor C1 connected in series in sequence; a first circuit breaker S2, a first resistor R2 and a first capacitor C2 connected in series in sequence; a first circuit breaker S3, a first resistor R3 and a first capacitor C3 connected in series in sequence; and a first circuit breaker S3, a first resistor R3 and a first capacitor C3 connected in series in sequence.

[0036] Among them, the first circuit breaker is used to branch the radio frequency conducted interference signal to obtain four input signals; the first resistor is used to obtain a preset common mode impedance, and the first capacitor is used to couple the four input signals in parallel.

[0037] According to an embodiment of the present disclosure, one end of each first capacitor in the four branches is respectively connected to the first phase line, the second phase line, the third phase line and the ground line of the AC power supply.

[0038] According to an embodiment of the present disclosure, the three-phase five-wire coupling network includes five branches, and the five branches are respectively a second circuit breaker S5, a second resistor R5, and a second capacitor C5 connected in series in sequence; a second circuit breaker S6, a second resistor R6, and a second capacitor C6 connected in series in sequence; a second circuit breaker S7, a second resistor R7, and a second capacitor C7 connected in series in sequence; a second circuit breaker S8, a second resistor R8, and a second capacitor C8 connected in series in sequence; and a second circuit breaker S9, a second resistor R9, and a second capacitor C9 connected in series in sequence.

[0039] Among them, the second circuit breaker is used to branch the radio frequency conducted interference signal to obtain five input signals; the second resistor is used to obtain a preset common mode impedance, and the second capacitor is used to couple the five input signals in parallel.

[0040] According to an embodiment of the present disclosure, one end of each first capacitor in the five branches is respectively connected to the first phase line, the second phase line, the third phase line, the neutral line and the ground line of the AC power supply.

[0041] According to an embodiment of the present disclosure, it also includes: a double switch, one end of the double switch is connected to the radio frequency signal transmitter, and the other end is connected to one end of the first circuit breaker or one end of the second circuit breaker, which is used to control the radio frequency conducted interference signal to flow to the three-phase four-wire coupling network or the three-phase five-wire coupling network.

[0042] In the embodiment of the present disclosure, the radio frequency interference signal is divided into two paths S through R0 01 and S 02 , through S 01 Divided into four paths, the RF signal is coupled in parallel to the L1 end of the EUT through S1 in series with R1 and C1, the RF signal is coupled in parallel to the L2 end of the EUT through S2 in series with R2 and C2, the RF signal is coupled in parallel to the L3 end of the EUT through S3 in series with R3 and C3, and the RF interference signal is coupled in parallel to the PE end of the EUT through S4 in series with R4 and C4.

[0043] By S 02 Divided into five paths, the RF signal is coupled in parallel to the L1 end of the EUT through S5, R5 and C5 in series; the RF signal is coupled in parallel to the L2 end of the EUT through S6, R7 and C6 in series, the RF signal is coupled in parallel to the L3 end of the EUT through S7, R8 and C8 in series, the RF signal is coupled in parallel to the N end of the EUT through S8, and the RF interference signal is coupled in parallel to the PE end of the EUT through S9, R9 and C9 in series, forming a coupling network device.

[0044] In a possible embodiment of the present disclosure, the output impedance R0 of the RF signal transmitter is 50Ω, R1, R2, R3 and R4 are respectively 400Ω resistors, and when the circuit breakers R1, R2, R3 and R4 are all closed, R1, R2, R3 and R4 are all in parallel state, and the resistance value R （1-4） =100Ω, the calculated common mode impedance Z=R0+R （1-4） =150Ω.

[0045] In a possible embodiment of the present disclosure, R5, R6, R7, R8 and R9 are respectively 500Ω resistors. When the circuit breakers R5, R6, R7, R8 and R9 are all closed, R5, R6, R7, R8 and R9 are in parallel state, and the resistance value R （5-9） =100Ω, the calculated common mode impedance Z=R0+R （5-9） =150Ω.

[0046] Therefore, the three-phase four-wire coupling network and the three-phase five-wire coupling network designed in the present invention both meet the common mode impedance between 130Ω and 170Ω in the 0.15MHz-24MHz frequency band; in the 24MHz-80MHz frequency band, the common mode impedance is between 105Ω and 210Ω, and meet the requirements of the GB / T 17626.6-2017 "Electromagnetic Compatibility Test and Measurement Technology Radio Frequency Field Induced Conducted Interference Immunity" standard for the use of coupling / decoupling networks (CDNs) for power lines.

[0047] In a possible embodiment of the present disclosure, the RF conducted interference signal emitted by the RF signal transmitter is amplitude modulated with a 1kHz sine wave (modulation degree is 80%), and the frequency range is 150kHz-80MHz to simulate the actual test level interference signal.

[0048] According to an embodiment of the present disclosure, the structure of the decoupling network is a clamp-on tube B1, B2, B3, B3 and B5, which is nested on the cable at the AC power supply end.

[0049] In the embodiments of the present disclosure, the decoupling network uses a mosaic tube to facilitate the operability of field testing of high-power active equipment.

[0050] According to an embodiment of the present disclosure, the clamp-on tube is a nickel-zinc soft ferrite magnetic ring, and the material of the nickel-zinc soft ferrite magnetic ring includes a NiFe2O4 solid solution and a NiZn2O4 solid solution.

[0051] According to the embodiments of the present disclosure, the relative initial magnetic permeability of the nickel-zinc soft ferrite magnetic ring is 15-70, and the Curie point temperature is 350°C-450°C.

[0052] In the embodiments of the present disclosure, a decoupling network is constructed using a nickel-zinc soft ferrite magnetic ring, which can generate high impedance in the entire frequency range, ensuring that the conducted immunity test of the device to be tested is effectively carried out. Among them, the material of the nickel-zinc soft ferrite magnetic ring includes a NiFe2O4 solid solution and a NiZn2O4 solid solution, which has a low magnetic permeability and a high resistivity, so the high-frequency eddy current loss is small. In the low-frequency range, the ferrite magnetic ring has magneto-electric induction; in the high-frequency range, the ferrite magnetic ring has inductance performance, which can block high-frequency interference like a capacitor. When a high-frequency current passes through the ferrite magnetic ring, it will generate a magnetic field inside the magnetic ring. Since ferrite has a certain absorption effect on the magnetic field, the high-frequency noise is converted into heat energy and dissipated, thereby reducing electromagnetic interference. By using a ferrite magnetic ring on the power line to suppress the conducted interference signal, the interference signal can be effectively suppressed and the impact of electromagnetic radiation on the circuit can be reduced.

[0053] Among them, the inductance calculation formula of the nickel-zinc soft ferrite magnetic ring is:

[0054] ,

[0055] Where, L is the inductance in Henry;

[0056] μ0 is the vacuum magnetic permeability, which is 4π×10 -7 H / m;

[0057] μ r is the relative magnetic permeability;

[0058] N is the number of coil turns;

[0059] S is the magnetic cross-sectional area, and the calculation formula is:

[0060] ,

[0061] Where D is the outer diameter of the magnetic ring, d is the inner diameter of the magnetic ring, and h is the height;

[0062] I is the ratio of the effective magnetic path length to the average magnetic path length, and the calculation formula is:

[0063] .

[0064] In some possible embodiments, the magnetic permeability of the nickel-zinc soft ferrite ring material is between 5 and 1500, and a nickel-zinc soft ferrite ring with an inner diameter of 30 mm, an outer diameter of 50 mm, a height of 20 mm, and a relative magnetic permeability of about 1000 is selected, and 14-16 nickel-zinc soft ferrite rings are arranged on each cable at the AC power supply end to meet the inductance As a decoupling network device for RF conducted interference in the power lines of high-power active devices (rated current greater than 200A), it can effectively suppress interference signals and reduce the impact of electromagnetic radiation on circuits.

[0065] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0066] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A radio frequency conducted interference coupling and decoupling network device, characterized in that: include: A radio frequency signal transmitter, used to transmit a radio frequency conducted interference signal; AC power supply terminal, used to provide power to the device under test; A coupling network, including a three-phase four-wire coupling network and a three-phase five-wire coupling network, for dividing the radio frequency conducted interference signal into four input signals and five input signals and coupling the four input signals in parallel to the cables at the AC power supply end and coupling the five input signals in parallel to the cables at the AC power supply end; The decoupling network is arranged between the AC power supply terminal and the coupling network, and is used for absorbing radio frequency interference signals in the external environment.

2. The radio frequency conducted interference coupling and decoupling network device according to claim 1, characterized in that: The three-phase four-wire coupling network includes four branches, each of which includes a first circuit breaker, a first resistor and a first capacitor connected in series in sequence; Among them, the first circuit breaker is used to branch the radio frequency conducted interference signal to obtain the four input signals; the first resistor is used to obtain a preset common mode impedance, and the first capacitor is used to couple the four input signals in parallel.

3. The radio frequency conducted interference coupling and decoupling network device according to claim 2, characterized in that: One end of each of the first capacitors in the four branches is respectively connected to the first phase line, the second phase line, the third phase line and the ground line of the AC power supply.

4. The radio frequency conducted interference coupling and decoupling network device according to claim 1, characterized in that: The three-phase five-wire coupling network includes five branches, each of which includes a second circuit breaker, a second resistor and a second capacitor connected in series in sequence; Among them, the second circuit breaker is used to branch the radio frequency conducted interference signal to obtain the five input signals; the second resistor is used to obtain a preset common mode impedance, and the second capacitor is used to couple the five input signals in parallel.

5. The radio frequency conducted interference coupling and decoupling network device according to claim 4, characterized in that: One end of each of the first capacitors in the five branches is respectively connected to the first phase line, the second phase line, the third phase line, the neutral line and the ground line of the AC power supply.

6. The radio frequency conducted interference coupling and decoupling network device according to claim 1, characterized in that: Also includes: A double switch, one end of which is connected to the radio frequency signal transmitter, and the other end of which is connected to one end of the first circuit breaker or one end of the second circuit breaker, for controlling the radio frequency conducted interference signal to flow to a three-phase four-wire coupled network or a three-phase five-wire coupled network.

7. The radio frequency conducted interference coupling and decoupling network device according to claim 1, characterized in that: The decoupling network is structured as a clamp-on tube, which is nested on the cable at the AC power supply end.

8. The radio frequency conducted interference coupling and decoupling network device according to claim 7, characterized in that: The clamp-on tube is a nickel-zinc soft ferrite magnetic ring, and the material of the nickel-zinc soft ferrite magnetic ring includes a NiFe2O4 solid solution and a NiZn2O4 solid solution.

9. The radio frequency conducted interference coupling and decoupling network device according to claim 8, characterized in that: The relative initial magnetic permeability of the nickel-zinc soft ferrite magnetic ring is 15-70, and the Curie point temperature is 350°C-450°C.

10. The radio frequency conducted interference coupling and decoupling network device according to claim 2 or 4, characterized in that: In the frequency band of 0.15MHz-24MHz, the common mode impedance is between 130Ω-170Ω; in the frequency band of 24MHz-80MHz, the common mode impedance is between 105Ω-210Ω.

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