An EMS test auxiliary system

Abstract

The invention relates to an EMS test auxiliary system, comprising: an EMS generating device, a collecting device, a transient protection device, a differential mode inductor device, a common mode inductor device, and a ferrite device; the transient protection device comprises a transient protection unit and a first enabling switch connected in parallel; the differential mode inductor device comprises a differential mode inductor unit and a second enabling switch connected in parallel; the common mode inductor device comprises a common mode inductor unit and a third enabling switch connected in parallel; the ferrite device comprises a ferrite unit and a fourth enabling switch connected in parallel; the collecting device is connected to a control logic module, and the control logic module is respectively connected to the first enabling switch, the second enabling switch, the third enabling switch, and the fourth enabling switch; the collecting device collects a peak voltage signal and a peak current signal of an interference signal; the control logic module enables the first enabling switch, the second enabling switch, the third enabling switch, and the fourth enabling switch to be opened and / or closed according to a decision logic based on the peak voltage signal and the peak current signal.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic immunity test in industrial control, and in particular to an EMS test auxiliary system. Background Art

[0002] In order to determine the status of electromagnetic interference, it is usually necessary to conduct electromagnetic interference tests on electrical equipment (equipment under test). However, when conducting electromagnetic interference tests on equipment under test (EUT), since the auxiliary equipment (auxiliary equipment, AE) connected to the EUT includes devices that are sensitive to electromagnetic interference, the auxiliary equipment will affect the test results of the EUT, which may seriously affect the accuracy of the EUT's own anti-electromagnetic interference evaluation.

[0003] The existing technology for the protection of auxiliary equipment is mostly implemented based on the principle of national standards, but the requirements for residual voltage after decoupling in the relevant national standards are unclear or very loose. Taking the surge immunity test as an example, the national standard has no requirements for residual voltage, only principles (depending on the protection requirements of auxiliary equipment); in the electrical fast transient pulse group immunity test, the residual voltage requirement is 400V (when the interference voltage is 4000V), which is already a very high voltage (compared to the process signal in the industrial control field is only in the range of 0-5V). If the auxiliary equipment is not highly resistant to interference, its normal operation is likely to be affected. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an EMS test auxiliary system, which solves the technical problem in the prior art that the auxiliary equipment is interfered by interference signals.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] An embodiment of the present invention provides an EMS test auxiliary system, which is used to connect a device under test and an auxiliary device respectively, and is characterized in that the auxiliary system comprises: an EMS generating device, a collection device, a transient protection device, a differential mode inductor device, a common mode inductor device and a ferrite device connected to the auxiliary device, which are electrically connected in sequence;

[0009] The transient protection device comprises a transient protection unit and a first enabling switch connected in parallel; the differential mode inductor device comprises a differential mode inductor unit and a second enabling switch connected in parallel; the common mode inductor device comprises a common mode inductor unit and a third enabling switch connected in parallel; the ferrite device comprises a ferrite unit and a fourth enabling switch connected in parallel;

[0010] Wherein, the acquisition device is also connected to the control logic module, and the control logic module is respectively connected to the first enabling switch, the second enabling switch, the third enabling switch, and the fourth enabling switch; the acquisition device is used to collect the peak voltage signal and the peak current signal of the interference signal emitted by the EMS generating device;

[0011] The control logic module is used to enable opening and / or closing of a first enabling switch, a second enabling switch, a third enabling switch, and a fourth enabling switch connected to the control logic module respectively according to a preset decision logic based on the peak voltage signal and the peak current signal;

[0012] The transient protection unit is used to absorb the voltage in the interference signal that exceeds a preset first pressure value when the first enabling switch is disconnected; the differential mode inductance unit is used to absorb the high-frequency signal in the differential mode form in the interference signal when the second enabling switch is disconnected; the common mode inductance unit is used to absorb the common mode interference signal in the interference signal when the third enabling switch is disconnected; the ferrite unit is used to absorb the signal in the interference signal whose frequency is within a preset range and exceeds a preset second pressure value when the fourth enabling switch is disconnected.

[0013] Preferably,

[0014] The EMS generating device comprises: an EMS generator, a coupling module, and a decoupling module;

[0015] Wherein, the EMS generator is connected to the coupling module;

[0016] One end of the coupling module is used to connect to the device under test;

[0017] The other end of the coupling module is connected to one end of the decoupling module;

[0018] The other end of the decoupling module is connected to the collection device.

[0019] Preferably,

[0020] The transient protection unit is one of a TVS, a varistor, a gas discharge tube, or the first combination unit or the second combination unit;

[0021] The first combination unit is a gas discharge tube, a decoupling resistor, and a TVS connected in series in sequence;

[0022] The second combination unit is a varistor, a decoupling resistor, and a TVS connected in series in sequence.

[0023] Preferably,

[0024] The differential mode inductor unit is a differential mode inductor;

[0025] The common mode inductor unit is a common mode inductor.

[0026] Preferably,

[0027] The ferrite unit is a ferrite bead or a ferrite ring.

[0028] Preferably,

[0029] The preset decision logic includes: if the peak voltage signal is greater than 50V and the peak current signal is greater than 0.5A, respectively enabling the first enabling switch, the second enabling switch, and the third enabling switch connected to the control logic module to be opened, and closing the fourth enabling switch.

[0030] Preferably,

[0031] The preset decision logic includes: if the peak voltage signal is greater than 50V and the peak current signal is less than 0.5A, respectively enabling the first enabling switch, the third enabling switch, and the fourth enabling switch connected to the control logic module to be opened, and closing the second enabling switch.

[0032] Preferably,

[0033] The preset decision logic includes: if the peak voltage signal is less than 50V and the peak current signal is greater than 0.5A, respectively enabling the first enabling switch, the second enabling switch, and the fourth enabling switch connected to the control logic module to be opened, and closing the third enabling switch.

[0034] Preferably,

[0035] The preset decision logic includes: if the peak voltage signal is less than 50V and the peak current signal is less than 0.5A, respectively enabling the second enabling switch, the third enabling switch, and the fourth enabling switch connected to the control logic module to be opened, and closing the first enabling switch.

[0036] Preferably, the system further comprises:

[0037] An isolated power supply device for connecting to the auxiliary equipment;

[0038] The isolated power supply device is one of an isolation transformer, an isolated AC / DC power supply, an isolated DC / DC power supply, and a battery;

[0039] Wherein, the auxiliary equipment is arranged in a floating test arrangement.

[0040] (III) Beneficial effects

[0041] The beneficial effects of the present invention are as follows: an EMS test auxiliary system of the present invention adopts a collection device, a transient protection device, a differential mode inductance device, a common mode inductance device, and a ferrite device; the collection device collects the peak voltage signal and the peak current signal of the interference signal; the control logic module enables the opening and / or closing of the first enabling switch, the second enabling switch, the third enabling switch, and the fourth enabling switch according to the decision logic based on the peak voltage signal and the peak current signal. It realizes the absorption of the voltage exceeding the preset first pressure value in the interference signal, the absorption of the high-frequency signal in the differential mode form in the interference signal, the absorption of the common mode interference signal in the interference signal, and the absorption of the signal whose frequency within the preset range in the interference signal exceeds the preset second pressure value at the same time, thereby solving the technical problem of the auxiliary equipment being interfered by the interference signal in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the structure of an EMS test auxiliary system of the present invention;

[0043] Figure 2 The present invention is a schematic structural diagram of an EMS test auxiliary system that connects a test device and auxiliary equipment when in use. DETAILED DESCRIPTION

[0044] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0045] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0046] See also Figure 1 and Figure 2 This embodiment provides an EMS test auxiliary system, which is used to connect the test equipment and the auxiliary equipment respectively. The auxiliary system includes: an EMS generating device, a collection device, a transient protection device, a differential mode inductor device, a common mode inductor device and a ferrite device connected to the auxiliary equipment, which are electrically connected in sequence.

[0047] The transient protection device includes a transient protection unit and a first enabling switch connected in parallel; the differential mode inductor device includes a differential mode inductor unit and a second enabling switch connected in parallel; the common mode inductor device includes a common mode inductor unit and a third enabling switch connected in parallel; and the ferrite device includes a ferrite unit and a fourth enabling switch connected in parallel.

[0048] Among them, the acquisition device is also connected to the control logic module, and the control logic module is respectively connected to the first enabling switch, the second enabling switch, the third enabling switch, and the fourth enabling switch; the acquisition device is used to collect the peak voltage signal and the peak current signal of the interference signal emitted by the EMS generating device.

[0049] The control logic module is used to enable opening and / or closing of a first enabling switch, a second enabling switch, a third enabling switch, and a fourth enabling switch connected to the control logic module respectively according to a preset decision logic based on the peak voltage signal and the peak current signal.

[0050] The transient protection unit is used to absorb the voltage (excessive, medium-to-high energy voltage) in the interference signal that exceeds a preset first pressure value when the first enabling switch is disconnected; the differential mode inductor unit is used to absorb the high-frequency signal in the differential mode form in the interference signal when the second enabling switch is disconnected; the common mode inductor unit is used to absorb the common-mode interference signal in the interference signal when the third enabling switch is disconnected; the ferrite unit is used to absorb the signal (low-energy, high-frequency, high-voltage interference signal) in the interference signal whose frequency is within a preset range and exceeds a preset second pressure value when the fourth enabling switch is disconnected.

[0051] Specifically, the first enabling switch is a bypass electronic jumper of the transient protection unit (automatically switched in conjunction with the control logic module, rather than manually operated). When the first enabling switch is closed, a low-resistance bypass circuit is formed, so that the transient protection unit does not participate in protecting the auxiliary equipment. When the first enabling switch is disconnected, the interference signal can only pass through the transient protection unit, so the transient protection unit participates in protecting the auxiliary equipment. The other enabling switches are similar and will not be described in detail here.

[0052] Specifically, the auxiliary device itself may be a signal source. The auxiliary device allows the device under test to fully simulate the actual working scene, or to better observe the state of the device under test. For example, if the device under test is a current signal acquisition module, the current signal source, resistor, and electric control valve may all be auxiliary devices.

[0053] In the practical application of this embodiment, the EMS generating device includes: an EMS generator, a coupling module, and a decoupling module.

[0054] Wherein, the EMS generator is connected to the coupling module.

[0055] One end of the coupling module is used to connect to the device under test.

[0056] The other end of the coupling module is connected to one end of the decoupling module.

[0057] The other end of the decoupling module is connected to the collection device.

[0058] In practical applications of this embodiment, the transient protection unit is one of a TVS, a varistor, a gas discharge tube, or the first combination unit or the second combination unit.

[0059] The first combination unit is a gas discharge tube, a decoupling resistor, and a TVS connected in series in sequence.

[0060] The second combination unit is a varistor, a decoupling resistor, and a TVS connected in series in sequence.

[0061] Transient voltage suppressor diode, or TVS for short, is a high-efficiency protection device in the form of a diode. When the two poles of a TVS diode are subjected to a reverse transient high-energy impact, it can change the high impedance between the two poles into a low impedance at a speed of 10 to the negative 12th power of a second, absorbing surge power of up to several kilowatts, clamping the voltage between the two poles to a predetermined value, effectively protecting the precision components in the electronic circuit and preventing damage from various surge pulses.

[0062] Transient protection unit prevents excessive, medium and high energy voltage from directly entering auxiliary equipment.

[0063] In practical applications of this embodiment, the differential mode inductor unit is a differential mode inductor.

[0064] The differential mode inductor unit uses the high-frequency inductance characteristics of the coil itself to block the flow of high-frequency interference signals in the form of differential mode, and works together with the common mode inductor to suppress the influence of interference signals on auxiliary equipment. The differential mode inductor is an inductor with a large inductive reactance to differential mode high-frequency interference.

[0065] The common mode inductor unit is a common mode inductor.

[0066] The common-mode inductor unit uses the principle of large inductance generated by the superposition of magnetic flux of two groups of inductor coils of the same specification, which strongly suppresses the common-mode interference current signal flowing through and minimizes the common-mode interference current flowing into the auxiliary equipment.

[0067] Common mode inductors, also called common mode chokes, are often used in computer switching power supplies to filter common mode electromagnetic interference signals. In board design, common mode inductors also play the role of EMI filtering, which is used to suppress the electromagnetic waves generated by high-speed signal lines from radiating outward.

[0068] In practical applications of this embodiment, the ferrite unit is a ferrite bead or a ferrite ring.

[0069] The ferrite unit utilizes the high magnetic permeability and high-frequency loss characteristics of ferrite devices to effectively suppress low-energy, high-frequency, and high-voltage interference signals entering auxiliary equipment.

[0070] In the actual application of this embodiment, the pre-set decision logic includes: if the peak voltage signal is greater than 50V and the peak current signal is greater than 0.5A, the first enabling switch, the second enabling switch, the third enabling switch connected to the control logic module are respectively enabled to be disconnected, and the fourth enabling switch is closed.

[0071] In the actual application of this embodiment, the pre-set decision logic includes: if the peak voltage signal is greater than 50V and the peak current signal is less than 0.5A, the first enabling switch, the third enabling switch, and the fourth enabling switch connected to the control logic module are respectively enabled to be disconnected, and the second enabling switch is closed.

[0072] In the actual application of this embodiment, the pre-set decision logic includes: if the peak voltage signal is less than 50V and the peak current signal is greater than 0.5A, the first enabling switch, the second enabling switch, and the fourth enabling switch connected to the control logic module are respectively enabled to be disconnected, and the third enabling switch is closed.

[0073] In the actual application of this embodiment, the pre-set decision logic includes: if the peak voltage signal is less than 50V and the peak current signal is less than 0.5A, the second enabling switch, the third enabling switch, and the fourth enabling switch connected to the control logic module are respectively enabled to be disconnected, and the first enabling switch is closed.

[0074] In the practical application of this embodiment, the system further includes:

[0075] An isolated power supply device for connecting to the auxiliary equipment.

[0076] The isolated power supply device is one of an isolation transformer, an isolated AC / DC power supply, an isolated DC / DC power supply, and a battery.

[0077] The auxiliary equipment is arranged in a floating test arrangement. In this embodiment, the floating test arrangement uses an insulating support of 0.8m high (or above), and the auxiliary equipment is placed on a ground reference plane, and there is no metal material within 0.5m around it (except for its own signal and power interconnection lines), so that the auxiliary equipment has a sufficiently small distributed capacitance to the ground to achieve a "floating" effect. The power supply module is isolated in coordination to electrically "isolate" the auxiliary equipment from the outside world.

[0078] Specifically, each isolated power supply module is powered separately to prevent one module from being damaged due to high voltage discharge or other reasons and affecting other modules. The purpose of this is to ensure that each module works independently without interference.

[0079] Five functions of the isolated power supply device:

[0080] 1. Isolation, specifically including safety isolation, noise isolation and ground loop elimination. Safety isolation includes: strong and weak current isolation IGBT isolation drive\surge isolation protection\lightning isolation protection (such as isolation protection of medical electronic equipment that comes into contact with the human body). Noise isolation includes: isolation of analog circuits and digital circuits, isolation of strong and weak signals. Ground loop elimination: remote signal transmission, distributed power supply system. 2. Protection, specifically including: short circuit protection, overvoltage protection, undervoltage protection, overcurrent protection, and other protections. 3. Voltage conversion. 4. Voltage stabilization AC, specifically including: AC power supply\remote DC power supply\distributed power supply system\battery power supply. 5. Noise reduction, specifically including active filtering and isolators. Isolators are a type of device that uses the linear optocoupler isolation principle to convert input signals and output them. The input, output and working power supply are isolated from each other, and are particularly suitable for use with equipment and instruments that require electrical isolation. Isolators, also known as signal isolators, are an important component of industrial control systems. They are mainly used to reduce shock and vibration transmission.

[0081] An EMS test auxiliary system in this embodiment adopts a collection device, a transient protection device, a differential mode inductor device, a common mode inductor device, and a ferrite device; the collection device collects the peak voltage signal and the peak current signal of the interference signal; the control logic module enables the opening and / or closing of the first enabling switch, the second enabling switch, the third enabling switch, and the fourth enabling switch according to the decision logic based on the peak voltage signal and the peak current signal. It realizes the absorption of the voltage exceeding the preset first pressure value in the interference signal, the absorption of the high-frequency signal in the differential mode form in the interference signal, the absorption of the common mode interference signal in the interference signal, and the absorption of the signal exceeding the preset frequency value and the preset second pressure value in the interference signal, thereby solving the technical problem of the auxiliary equipment being interfered by the interference signal in the prior art.

[0082] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0083] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions.

[0084] It should be noted that in the claims, any reference numerals placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the claims enumerating several means, several of these means may be embodied by the same hardware. The use of the words first, second, third, etc., is for convenience of expression only and does not indicate any order. These words may be understood as part of the component name.

[0085] In addition, it should be noted that, in the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0086] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments after knowing the basic creative concept. Therefore, the claims should be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0087] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention should also include these modifications and variations.

Claims

1. An EMS test auxiliary system, the EMS test auxiliary system is used to connect the test equipment and the auxiliary equipment respectively, characterized in that: The auxiliary system includes: an EMS generating device, a collecting device, a transient protection device, a differential mode inductor device, a common mode inductor device and a ferrite device connected to the auxiliary device, which are electrically connected in sequence; The transient protection device comprises a transient protection unit and a first enabling switch connected in parallel; the differential mode inductor device comprises a differential mode inductor unit and a second enabling switch connected in parallel; the common mode inductor device comprises a common mode inductor unit and a third enabling switch connected in parallel; the ferrite device comprises a ferrite unit and a fourth enabling switch connected in parallel; Wherein, the acquisition device is also connected to the control logic module, and the control logic module is respectively connected to the first enabling switch, the second enabling switch, the third enabling switch, and the fourth enabling switch; the acquisition device is used to collect the peak voltage signal and the peak current signal of the interference signal emitted by the EMS generating device; The control logic module is used to enable opening and / or closing of a first enabling switch, a second enabling switch, a third enabling switch, and a fourth enabling switch connected to the control logic module respectively according to a preset decision logic based on the peak voltage signal and the peak current signal; The transient protection unit is used to absorb the voltage in the interference signal that exceeds a preset first pressure value when the first enabling switch is disconnected; the differential mode inductance unit is used to absorb the high-frequency signal in the differential mode form in the interference signal when the second enabling switch is disconnected; the common mode inductance unit is used to absorb the common mode interference signal in the interference signal when the third enabling switch is disconnected; the ferrite unit is used to absorb the signal in the interference signal whose frequency is within a preset range and exceeds a preset second pressure value when the fourth enabling switch is disconnected.

2. The system according to claim 1, characterized in that The EMS generating device comprises: an EMS generator, a coupling module, and a decoupling module; Wherein, the EMS generator is connected to the coupling module; One end of the coupling module is used to connect to the device under test; The other end of the coupling module is connected to one end of the decoupling module; The other end of the decoupling module is connected to the collection device.

3. The system according to claim 2, characterized in that The transient protection unit is one of a TVS, a varistor, a gas discharge tube, or the first combination unit or the second combination unit; The first combination unit is a gas discharge tube, a decoupling resistor, and a TVS connected in series in sequence; The second combination unit is a varistor, a decoupling resistor, and a TVS connected in series in sequence.

4. The system according to claim 3, characterized in that The differential mode inductor unit is a differential mode inductor; The common mode inductor unit is a common mode inductor.

5. The system according to claim 4, characterized in that The ferrite unit is a ferrite bead or a ferrite ring.

6. The system according to claim 5, characterized in that The preset decision logic includes: if the peak voltage signal is greater than 50V and the peak current signal is greater than 0.5A, respectively enabling the first enabling switch, the second enabling switch, and the third enabling switch connected to the control logic module to be opened, and closing the fourth enabling switch.

7. The system according to claim 6, characterized in that The preset decision logic includes: if the peak voltage signal is greater than 50V and the peak current signal is less than 0.5A, respectively enabling the first enabling switch, the third enabling switch, and the fourth enabling switch connected to the control logic module to be opened, and closing the second enabling switch.

8. The system according to claim 7, characterized in that The preset decision logic includes: if the peak voltage signal is less than 50V and the peak current signal is greater than 0.5A, respectively enabling the first enabling switch, the second enabling switch, and the fourth enabling switch connected to the control logic module to be opened, and closing the third enabling switch.

9. The system according to claim 8, characterized in that The preset decision logic includes: if the peak voltage signal is less than 50V and the peak current signal is less than 0.5A, respectively enabling the second enabling switch, the third enabling switch, and the fourth enabling switch connected to the control logic module to be opened, and closing the first enabling switch.

10. The system according to claim 9, characterized in that The system further comprises: An isolated power supply device for connecting to the auxiliary equipment; The isolated power supply device is one of an isolation transformer, an isolated AC / DC power supply, an isolated DC / DC power supply, and a battery; Wherein, the auxiliary equipment is arranged in a floating test arrangement.

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