Method and device for determining immunity of protection device, equipment, medium and product

Abstract

The embodiment of the invention discloses a method and device for determining the immunity of a protection device, equipment, a medium and a product. The method comprises the following steps: determining a mapping relation between the voltage of a protection device and the current of the protection device; determining a simulation model of the protection device based on the mapping relation; creating a circuit topology comprising an interference generator and the simulation model; performing simulation operation on the circuit topology; and determining the immunity of the protection device based on the simulation result of the circuit topology. Actual testing does not need to be executed, the immunity of the protection device is determined in a simulation mode, and the economic cost and the time cost are reduced. For a protection circuit comprising a rectification filter circuit, the embodiment of the invention can quickly determine the immunity, and the operation difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic compatibility (EMC) protection technology, in particular to a method, device, equipment, medium and product for determining the anti-interference degree of a protection device. Background Art

[0002] EMC testing usually includes electromagnetic interference (EMI) testing and electromagnetic immunity (EMS) testing. EMS testing is usually used to test the immunity of equipment to electromagnetic interference. Immunity refers to the ability of electronic equipment or systems to maintain normal operation when facing electromagnetic interference. Immunity usually includes electrostatic discharge immunity, radio frequency electromagnetic field immunity, electrical fast transient pulse group immunity, surge immunity and conducted immunity, etc.

[0003] Currently, a series of actual tests are performed to evaluate the immunity of protection devices. However, actual tests have high economic and time costs. Moreover, when performing actual tests on power port circuits with rectification and filtering, due to the presence of filter capacitors, the evaluation results may have large deviations, and usually multiple iterations are required to obtain more accurate results. Summary of the invention

[0004] The embodiments of the present invention provide methods, devices, equipment, media and products for determining the immunity of a protection device, which are beneficial to reducing economic costs and time costs.

[0005] A method for determining the immunity of a protection device, comprising:

[0006] Determining a mapping relationship between a voltage of a protection device and a current of the protection device;

[0007] Based on the mapping relationship, determining a simulation model of the protection device;

[0008] creating a circuit topology including an interference generator and the simulation model;

[0009] Simulating and running the circuit topology;

[0010] Based on the simulation result of the circuit topology, the noise immunity of the protection device is determined.

[0011] Therefore, unlike the actual test of the immunity of the protection device, the embodiment of the present invention determines the simulation model of the protection device through the mapping relationship between the voltage and current of the protection device, simulates and runs the circuit topology including the interference generator and the simulation model, and thus determines the immunity of the protection device in a simulation manner, saving economic and time costs. Moreover, for the protection circuit scenario including the rectifier and filter circuit, the immunity is determined in a simulation manner, which reduces the difficulty of operation.

[0012] In one embodiment, the protection device is a metal oxide varistor (MOV);

[0013] The determining of a mapping relationship between a voltage of a protection device and a current of the protection device comprises:

[0014] Determine a mapping relationship formula of the MOV, wherein the mapping relationship formula includes a power function, the dependent variable of the power function is the voltage of the MOV, and the independent variable of the power function is the current of the MOV;

[0015] Based on a relationship curve between voltage and current of the MOV, determining at least two data points in a protection zone of the relationship curve;

[0016] Determining an exponential coefficient of the power function and a multiplication coefficient of the power function based on the at least two data points;

[0017] The mapping relationship is determined based on the exponential coefficient, the multiplication coefficient and the general formula of the mapping relationship.

[0018] It can be seen that the mapping relationship of MOV can be quickly determined based on the data points in the protection zone of the MOV relationship curve.

[0019] In one embodiment, the protection device is a transient voltage suppressor diode (TVS);

[0020] The determining of a mapping relationship between a voltage of a protection device and a current of the protection device comprises:

[0021] Determine a general formula of a mapping relationship of the TVS, wherein the general formula of the mapping relationship includes a linear function, the dependent variable of the linear function is the voltage of the TVS, and the independent variable of the linear function is the current of the TVS;

[0022] Based on a relationship curve between voltage and current of the TVS, determining at least two data points in a protection zone of the relationship curve;

[0023] Determining a slope and a constant term of the linear function based on the at least two data points;

[0024] The mapping relationship is determined based on the slope, the constant term and the general formula of the mapping relationship.

[0025] It can be seen that the mapping relationship of the TVS can be quickly determined based on the data points in the protection zone of the TVS relationship curve.

[0026] In one embodiment, the protection device is a TVS;

[0027] The determining of a mapping relationship between a voltage of a protection device and a current of the protection device comprises:

[0028] Determine a general formula of a mapping relationship of the TVS, wherein the general formula of the mapping relationship includes a linear function, the dependent variable of the linear function is the voltage of the TVS, and the independent variable of the linear function is the current of the TVS;

[0029] Determining the maximum breakdown voltage, maximum clamping voltage and peak clamping current of the TVS;

[0030] Determining a slope of the linear function based on the maximum clamping voltage, the maximum breakdown voltage, and the peak clamping current;

[0031] Based on the maximum breakdown voltage, determining a constant term of the linear function;

[0032] The mapping relationship is determined based on the slope, the constant term and the general formula of the mapping relationship.

[0033] It can be seen that based on the electrical parameters of the TVS, the mapping relationship of the TVS can be quickly determined.

[0034] In one embodiment, determining the simulation model of the protection device based on the mapping relationship includes:

[0035] Based on the mapping relationship, setting the property parameters of an arbitrary behavior voltage source (Arbitrary Behavioral Voltage Source) or an arbitrary behavior current source (Arbitrary Behavioral Current Source) in a simulation tool;

[0036] The arbitrary behavior voltage source or the arbitrary behavior current source is determined as a simulation model of the protection device.

[0037] Therefore, by setting an arbitrary behavior voltage source or an arbitrary behavior current source, it is convenient to generate a simulation model of the protection device.

[0038] In one embodiment, the creating a circuit topology including the interference generator and the simulation model includes:

[0039] In the simulation tool, coupling the arbitrary behavior voltage source or the arbitrary behavior current source with a protection object of the protection device to form a protection circuit;

[0040] In the simulation tool, the interference generator is coupled with the protection circuit to create the circuit topology.

[0041] Therefore, based on simulation tools, circuit topology can be quickly established.

[0042] In one embodiment, coupling the interference generator to the protection circuit includes:

[0043] A coupling-decoupling network is provided between the interference generator and the protection circuit.

[0044] It can be seen that by setting a coupling and decoupling network, the interference signal provided by the interference generator can be selectively coupled to the protection circuit.

[0045] In one embodiment, the interference generator is a surge generator;

[0046] Determining the noise immunity of the protection device based on the simulation result of the circuit topology includes at least one of the following:

[0047] When the simulation result indicates that the clamping voltage of the protection device is greater than a predetermined safety voltage during the surge immunity test, it is determined that the surge immunity of the protection device is unqualified;

[0048] When the simulation result indicates that the clamping voltage of the protection device is less than a predetermined voltage threshold during the surge immunity test, it is determined that the surge immunity of the protection device is unqualified;

[0049] When the simulation result indicates that during the surge immunity test, the clamping voltage of the protection device is less than or equal to a predetermined safety voltage and greater than or equal to a predetermined voltage threshold, it is determined that the surge immunity of the protection device is qualified.

[0050] It can be seen that the surge immunity of the protection device can be determined through simulation.

[0051] In one embodiment, the simulating and running the circuit topology includes:

[0052] Based on the tolerance range of the component parameters of the circuit topology, simulate and run the circuit topology;

[0053] The determining the immunity of the protection device based on the simulation result of the circuit topology includes:

[0054] Based on a range of simulation results corresponding to the tolerance range, the noise immunity of the protection device is determined.

[0055] It can be seen that based on the tolerance range of component parameters of the circuit topology, the simulation result range corresponding to the tolerance range can be obtained, so that the anti-interference under different component parameters can be determined, for example, the anti-interference under the worst scenario can be simulated.

[0056] A device for determining the immunity of a protection device, comprising:

[0057] A first determination module, used to determine a mapping relationship between a voltage of a protection device and a current of the protection device;

[0058] A second determination module, configured to determine a simulation model of the protection device based on the mapping relationship;

[0059] A creation module, used for creating a circuit topology including an interference generator and the simulation model;

[0060] A simulation module, used for simulating and running the circuit topology;

[0061] The third determination module is used to determine the noise immunity of the protection device based on the simulation result of the circuit topology.

[0062] Therefore, unlike the actual test of the immunity of the protection device, the embodiment of the present invention determines the simulation model of the protection device through the mapping relationship between the voltage and current of the protection device, simulates and runs the circuit topology including the interference generator and the simulation model, and thus determines the immunity of the protection device in a simulation manner, saving economic and time costs. Moreover, for the protection circuit scenario including the rectifier and filter circuit, the immunity is determined in a simulation manner, which reduces the difficulty of operation.

[0063] In one embodiment, the protection device is a MOV;

[0064] The first determination module is used to determine a general formula of a mapping relationship of the MOV, wherein the general formula of the mapping relationship includes a power function, wherein the dependent variable of the power function is the voltage of the MOV, and the independent variable of the power function is the current of the MOV; based on a relationship curve between the voltage and current of the MOV, at least two data points in a protection zone of the relationship curve are determined; based on the at least two data points, an exponential coefficient of the power function and a multiplication coefficient of the power function are determined; and the mapping relationship is determined based on the exponential coefficient, the multiplication coefficient and the general formula of the mapping relationship.

[0065] It can be seen that the mapping relationship of MOV can be quickly determined based on the data points in the protection zone of the MOV relationship curve.

[0066] In one embodiment, the protection device is a TVS;

[0067] The first determination module is used to determine a general formula of a mapping relationship of the TVS, wherein the general formula of the mapping relationship includes a linear function, the dependent variable of the linear function is the voltage of the TVS, and the independent variable of the linear function is the current of the TVS; based on a relationship curve between the voltage and current of the TVS, at least two data points in a protection zone of the relationship curve are determined; based on the at least two data points, a slope and a constant term of the linear function are determined; and the mapping relationship is determined based on the slope, the constant term and the general formula of the mapping relationship.

[0068] It can be seen that the mapping relationship of the TVS can be quickly determined based on the data points in the protection zone of the TVS relationship curve.

[0069] In one embodiment, the protection device is a TVS;

[0070] The first determination module is used to determine the general formula of the mapping relationship of the TVS, the general formula of the mapping relationship includes a linear function, the dependent variable of the linear function is the voltage of the TVS, and the independent variable of the linear function is the current of the TVS; determine the maximum breakdown voltage, the maximum clamping voltage and the peak clamping current of the TVS; determine the slope of the linear function based on the maximum clamping voltage, the maximum breakdown voltage and the peak clamping current; determine the constant term of the linear function based on the maximum breakdown voltage; determine the mapping relationship based on the slope, the constant term and the general formula of the mapping relationship.

[0071] It can be seen that based on the electrical parameters of the TVS, the mapping relationship of the TVS can be quickly determined.

[0072] In one embodiment, the second determination module is used to set the property parameters of an arbitrary behavior voltage source or an arbitrary behavior current source in a simulation tool based on the mapping relationship; and determine the arbitrary behavior voltage source or arbitrary behavior current source as a simulation model of the protection device.

[0073] Therefore, by setting an arbitrary behavior voltage source or an arbitrary behavior current source, it is convenient to generate a simulation model of the protection device.

[0074] In one embodiment, the creation module is used to couple the arbitrary behavior voltage source or arbitrary behavior current source with the protection object to form a protection circuit in the simulation tool; in the simulation tool, couple the interference generator with the protection circuit to create the circuit topology.

[0075] Therefore, based on simulation tools, circuit topology can be quickly established.

[0076] An electronic device, comprising:

[0077] processor;

[0078] A memory, configured to store executable instructions of the processor;

[0079] The processor is used to read the executable instructions from the memory and execute the executable instructions to implement any of the methods for determining the immunity of a protection device as described above.

[0080] A computer-readable storage medium stores computer instructions, which, when executed by a processor, implement any of the above methods for determining the immunity of a protection device.

[0081] A computer program product comprises a computer program, wherein when the computer program is executed by a processor, the computer program implements any of the above methods for determining the immunity of a protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the above and other features and advantages of the present invention will be more apparent to those skilled in the art. In the accompanying drawings:

[0083] Figure 1 is an exemplary flow chart of a method for determining the immunity of a protection device according to an embodiment of the present invention.

[0084] Figure 2 FIG. 4 is an exemplary schematic diagram of a curve showing a relationship between a voltage and a current of an MOV according to an embodiment of the present invention.

[0085] Figure 3 is an exemplary schematic diagram of a protection circuit of a power port according to an embodiment of the present invention.

[0086] Figure 4 is an exemplary structural diagram of a circuit topology including an interference generator and a simulation model according to an embodiment of the present invention.

[0087] Figure 5 is an exemplary schematic diagram of simulation results according to an embodiment of the present invention.

[0088] Figure 6 is an exemplary schematic diagram of test results according to an embodiment of the present invention.

[0089] Figure 7 is an exemplary structural diagram of an apparatus for determining the immunity of a protection device according to an embodiment of the present invention.

[0090] Figure 8 is an exemplary structural diagram of an electronic device according to an embodiment of the present invention.

[0091] The reference numerals are as follows:

[0092]

[0093] DETAILED DESCRIPTION

[0094] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail with reference to the following embodiments. Nouns and pronouns related to people in this patent application are not limited to specific genders.

[0095] For the sake of brevity and intuitiveness in description, the scheme of the present invention is explained below by describing several representative implementations. A large number of details in the implementations are only used to help understand the scheme of the present invention. However, it is obvious that the technical scheme of the present invention may not be limited to these details when implemented. In order to avoid unnecessarily obscuring the scheme of the present invention, some implementations are not described in detail, but only a framework is given. Hereinafter, "including" means "including but not limited to", and "according to..." means "at least according to..., but not limited to only according to...". Due to the language habits of Chinese, when the number of a component is not specifically specified below, it means that the component can be one or more, or can be understood as at least one.

[0096] The approach of evaluating the immunity of protection components through actual testing has many drawbacks (e.g., high economic and time costs, test results rely on user experience, etc.). In addition, the rectifier and filter circuit contains filter capacitors, and the filter capacitors can absorb different surge currents according to their capacitance. Therefore, it is quite difficult to perform actual testing on the protection circuit containing the rectifier and filter circuit.

[0097] In the embodiment of the present invention, a simulation model of the protection device is established, a simulation is performed for the circuit topology including the simulation model of the interference generator and the protection device, and the immunity of the protection device is determined based on the simulation results. Therefore, the embodiment of the present invention does not need to perform actual testing, which reduces economic and time costs. Moreover, for the protection circuit including the rectifier and filter circuit, the embodiment of the present invention can also quickly obtain the simulation results and determine the immunity of the protection device, reducing the difficulty of operation.

[0098] The above disclosure details the technical defects existing in the prior art, the causes of the technical defects, and the thinking and analysis process of overcoming the technical defects. In fact, the cognition of the above technical defects is not common knowledge in the field, but a novel discovery made by the applicant in research. In addition, the cause tracing of the technical defects and the thinking and analysis process of overcoming the technical defects are also the gradual analysis results of the applicant in the actual research process, and are not common knowledge in the field.

[0099] Figure 1 FIG. 1 is an exemplary flow chart of a method for determining the immunity of a protection device according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0100] Step 101: Determine a mapping relationship between a voltage of a protection device and a current of the protection device.

[0101] Here, the protection device may include a device that has a protective effect on at least one of the interferences of electrostatic discharge, radio frequency electromagnetic field, electrical fast transient pulse group (EFT), surge, etc. For example, the protection device may include: MOV, ceramic gas discharge tube (Gas Discharge Tube, GDT), glass discharge tube (Spark Gap Protector, SPG), TVS, electrostatic discharge suppressor (Electrostatic Discharge Suppressor, ESD) and semiconductor discharge tube (Thyristor Surge Suppressor, TSS), etc.

[0102] The above exemplary descriptions are typical examples of protection devices. Those skilled in the art will appreciate that such descriptions are merely exemplary and are not intended to limit the protection scope of the embodiments of the present invention.

[0103] In step 101, a mapping relationship between a voltage of a protection device and a current of the protection device may be represented by a function expression.

[0104] In one embodiment, the protection device is an MOV. Step 101 includes: determining a mapping relationship formula of the MOV, the mapping relationship formula includes a power function, the dependent variable of the power function is the voltage of the MOV, and the independent variable of the power function is the current of the MOV; based on a relationship curve between the voltage and the current of the MOV, determining at least two data points in a protection area of ​​the relationship curve; based on the at least two data points, determining an exponential coefficient of the power function and a multiplication coefficient of the power function; and determining a mapping relationship based on the exponential coefficient, the multiplication coefficient and the mapping relationship formula.

[0105] For example, the general mapping relationship of MOV can be:

[0106] V=A*I B ; Formula (1)

[0107] Where V is the voltage of MOV; I is the current of MOV; A is the multiplication coefficient; B is the exponential coefficient. The mapping relationship shown in formula (1) is applicable to various types of MOVs.

[0108] When the mapping relationship of a specific model of MOV needs to be determined, based on the relationship curve between the voltage and current of the specific model of MOV, which is usually provided by the MOV equipment manufacturer, at least two data points can be selected in the protection area of ​​the relationship curve, wherein each data point contains a quantitative current and a quantitative voltage that can be read based on the relationship curve. Then, the at least two data points are respectively substituted into the above formula (1) to calculate the respective values ​​of the multiplication coefficient A and the exponential coefficient B, thereby determining the mapping relationship of the specific model of MOV.

[0109] Figure 2 FIG. 1 is an exemplary schematic diagram of a relationship curve between voltage and current of an MOV according to an embodiment of the present invention. Figure 2 In the coordinate system shown, a relationship curve between the voltage and current of a specific model of MOV is shown, where the horizontal axis is the current (I) and the vertical axis is the voltage (V). The relationship curve 10 includes a non-working area S1, a protection area S2 and a damage area S3. For example, two data points are selected in the protection area S2, such as point f (b, V1) and point g (c, V2). For ease of calculation, the data point g when c is equal to 1 can be selected. The horizontal coordinate b and vertical coordinate V1 of point f, and the horizontal coordinate c and vertical coordinate V2 of point g are all known values ​​that can be read from the relationship curve 10. Then, by respectively substituting point f (b, V1) and point g (c, V2) into formula (1), the respective values ​​of the multiplication coefficient A and the exponential coefficient B can be calculated, so that the mapping relationship of the specific model of MOV can be determined.

[0110] In one embodiment, the protection device is a TVS; step 101 includes: determining a general mapping relationship formula of the TVS, the general mapping relationship formula includes a linear function, the dependent variable of the linear function is the voltage of the TVS, and the independent variable of the linear function is the current of the TVS; based on a relationship curve between the voltage and current of the TVS, determining at least two data points in a protection area of ​​the relationship curve; based on the at least two data points, determining the slope and constant term of the linear function; based on the slope, the constant term and the general mapping relationship formula, determining the mapping relationship.

[0111] For example, the general mapping relationship of TVS can be:

[0112] V=K*I+B; Formula (2)

[0113] Where V is the voltage of TVS; I is the current of TVS; K is the slope; B is the constant term. The mapping relationship shown in formula (2) is applicable to various types of TVS.

[0114] When it is necessary to determine the mapping relationship of a specific model of TVS, based on the relationship curve between the voltage and current of the specific model of TVS, which is usually provided by the TVS equipment manufacturer of the specific model, at least two data points can be selected in the protection area of ​​the relationship curve, wherein each data point contains a quantitative current and a quantitative voltage. Then, the at least two data points are respectively substituted into the above formula (2), and the respective values ​​of the slope K and the constant term B can be calculated, thereby determining the mapping relationship of the specific model of TVS.

[0115] In the above description, the coefficient values ​​in the mapping relationship formula are determined based on the data points selected from the relationship curve between voltage and current. In one embodiment, the coefficient values ​​in the mapping relationship formula may be determined by the electrical property parameters of the protection device instead of the relationship curve.

[0116] In one embodiment, the protection device is a TVS. Step 101 includes: determining a mapping relationship formula of the TVS, the mapping relationship formula includes a linear function, the dependent variable of the linear function is the voltage of the TVS, and the independent variable of the linear function is the current of the TVS; determining the maximum breakdown voltage, the maximum clamping voltage and the peak clamping current of the TVS; determining the slope of the linear function based on the maximum clamping voltage, the maximum breakdown voltage and the peak clamping current; determining the constant term of the linear function based on the maximum breakdown voltage; determining the mapping relationship based on the slope, the constant term and the mapping relationship formula.

[0117] For example: The general formula of TVS mapping relationship can be:

[0118] V=I*((V C_MAX -V BR_MAX ) / I PPM )+V BR_MAX Formula (3)

[0119] The general mapping relationship shown in formula (3) is applicable to various types of TVS.

[0120] Where V is the voltage of TVS; I is the current of TVS; V BR_MAX is the maximum breakdown voltage of TVS;

[0121] V C_MAX is the maximum clamping voltage of TVS; I PPM is the peak clamping current of TVS. The mapping relationship shown in formula (3) is applicable to various types of TVS.

[0122] When you need to determine the mapping relationship of a specific model of TVS, you can read the TVS equipment manual and other introductory documents to determine the maximum breakdown voltage V of the specific model of TVS. BR_MAX , Maximum clamping voltage V C_MAX and the peak clamping current IPPM Then, calculate the slope of the linear function ((V C_MAX -V BR_MAX ) / I PPM ), and calculate the constant term V of the linear function BR_MAX , thereby determining the mapping relationship of the TVS of this specific model.

[0123] The above describes a typical example of determining the mapping relationship of the protection device by taking MOV and TVS as examples. Those skilled in the art can appreciate that such description is only exemplary and is not intended to limit the protection scope of the embodiments of the present invention.

[0124] Step 102: Determine a simulation model of the protection device based on the mapping relationship.

[0125] In one embodiment, step 102 includes: setting attribute parameters of an arbitrary behavior voltage source or an arbitrary behavior current source (Arbitrary Behavioral Voltage Source) in a simulation tool based on the mapping relationship; determining the arbitrary behavior voltage source or the arbitrary behavior current source as a simulation model of the protection device. For example, the simulation tool can be implemented as LTSpice or MATLAB, etc.

[0126] Considering that the arbitrary behavior voltage source or arbitrary behavior current source is programmable, the mapping relationship can be imported into the attribute parameters (e.g., "value") of the arbitrary behavior voltage source or arbitrary behavior current source. In the subsequent circuit simulation, the arbitrary behavior voltage source or arbitrary behavior current source with the imported mapping relationship is used as the simulation model of the protection device. For example: Assume that the mapping relationship of the protection device is: V = 590*I 0.03 , V=590*I 0.03 Set it to the "value" in the arbitrary behavioral voltage source or arbitrary behavioral current source in LTSpice, and in subsequent simulations, use the arbitrary behavioral voltage source or arbitrary behavioral current source as the simulation model of the protection device.

[0127] The above exemplary descriptions are typical examples of simulation tools. Those skilled in the art will appreciate that such descriptions are merely exemplary and are not intended to limit the protection scope of the embodiments of the present invention.

[0128] The mapping relationship may include a power function, and the exponent value of the power function is determined by the material properties of the protection device and is usually less than 1. Simulation tools usually consume a lot of resources and time when calculating such power functions, and even overflow occurs during the simulation process. In one embodiment, the power function in the mapping relationship is converted into a logarithmic function (for example, the conversion is achieved based on Taylor series), and then the mapping relationship is imported into the attribute parameters of any behavior voltage source or any behavior current source, thereby reducing the amount of calculation.

[0129] For example: when the mapping relationship is V = A*I B , the mapping relationship is converted to V = A*(1+(ln(I))*B). Then, V = A*(1+(ln(I))*B) is set to the "value" in any behavioral voltage source or any behavioral current source in LTSpice.

[0130] Example: Assume the mapping relationship is V = 590*I 0.03 , convert the mapping relationship to V = 590 * (1 + (ln (I) * 0.03)), and then set V = 590 * (1 + (ln (I) * 0.03)) to the "value" in any behavioral voltage source or any behavioral current source in LTSpice. After the above-mentioned converted mapping relationship, the simulation time can be significantly reduced (for example, by 99%), and the simulation result deviation is very small (for example, less than 1%).

[0131] Step 103: Create a circuit topology including a jammer and a simulation model.

[0132] In one embodiment, step 103 includes: in a simulation tool, coupling an arbitrary behavior voltage source or an arbitrary behavior current source, a protection device, and a protection object of the protection device to form a protection circuit; in the simulation tool, coupling an interference generator with the protection circuit to create a circuit topology.

[0133] An interference generator is a simulation module in a simulation tool that is used to generate simulated interference signals. For example, interference generators can include electrostatic discharge generators, radio frequency electromagnetic field generators, electrical fast transient pulse group generators, surge generators, and conduction generators, etc. Protection devices provide protection for the protected object. The protected object can be implemented as a power port or a signal port.

[0134] Figure 3 is an exemplary schematic diagram of a protection circuit of a power port according to an embodiment of the present invention.

[0135] exist Figure 3 In the example, the protection objects include the rectifier diode D, the filter capacitor C and the load R L The protected object needs to pass the standard surge immunity test (1Kv; differential mode (DM); 2 ohm (Ω) coupling). That is, when a surge occurs, the diode rectifier D, the filter capacitor C and the load R L The voltage on the resistor should not exceed its rated value. Therefore, a protection device 20 (eg, MOV) is provided to form a protection circuit.

[0136] In one embodiment, coupling the interference generator to the protection circuit includes: providing a coupling decoupling network (CDN) between the interference generator and the protection circuit. The CDN is used to achieve signal coupling or decoupling, isolate noise signals, and couple interference signals to the protection circuit.

[0137] Figure 4 is an exemplary structural diagram of a circuit topology including an interference generator and a simulation model according to an embodiment of the present invention. Figure 4 In the embodiment, the surge generator 30 is coupled to the protection circuit 50 via CDN 40. The protection circuit 50 includes an arbitrary behavior voltage source B5. The arbitrary behavior voltage source B5 is a simulation model of the protection device. It can be seen that the protection circuit 50 also includes a rectifier diode D1, a filter capacitor C2 and a load R1. The surge generator 30 can generate a surge voltage in a simulation manner.

[0138] Step 104: Simulate and run the circuit topology.

[0139] Here, the circuit topology is simulated and run in the simulation tool. For example, the simulation is run Figure 4 In the circuit topology shown, a surge voltage is generated by a surge generator 30 to initiate a surge immunity test.

[0140] Step 105: Determine the noise immunity of the protection device based on the simulation result of the circuit topology.

[0141] In one embodiment, the interference generator is a surge generator; step 105 includes at least one of the following:

[0142] (1) When the simulation result indicates that the clamping voltage of the protection device is greater than the predetermined safety voltage during the surge immunity test, it is determined that the surge immunity of the protection device is unqualified.

[0143] For example, assuming that the safety voltage is 265V, when the voltage of any behavioral voltage source B5 is greater than 265V during the surge immunity test, it is determined that the protection device cannot resist the surge, and therefore the surge immunity is unqualified.

[0144] (2) When the simulation result indicates that the clamping voltage of the protection device is less than a predetermined voltage threshold during the surge immunity test, it is determined that the surge immunity of the protection device is unqualified.

[0145] When the clamping voltage of the protection device is too small, it may affect the normal use of the load, and the surge immunity of the protection device is also considered unqualified. For example, assuming that the voltage threshold is 100V, when the clamping voltage of the protection device is less than 100V during the surge immunity test, the clamping voltage of the protection device is considered too low, so the surge immunity is unqualified.

[0146] (3) When the simulation results indicate that during the surge immunity test, the clamping voltage of the protection device is less than or equal to the predetermined safety voltage and greater than or equal to the predetermined voltage threshold, it is determined that the surge immunity of the protection device is qualified.

[0147] In addition to simulating protection circuits under normal conditions, embodiments of the present invention can also be used for worst-case evaluation, which is difficult to achieve through actual testing. Embodiments of the present invention can achieve accurate risk assessment of different ranges of component parameters (such as tolerance and degradation).

[0148] In one embodiment, step 104 includes: simulating and running the circuit topology based on the tolerance range of the component parameters of the circuit topology; step 105 includes: determining the noise immunity of the protection device based on the range of simulation results corresponding to the tolerance range.

[0149] For example: Assume that the capacitance value of capacitor C2 is 22 microfarads (μF) and the tolerance range is ±20%. Based on the tolerance range, it can be determined that the possible value range of capacitor C2 is [17.6 (μF), 26.4 (μF)]. Select multiple capacitance values ​​in this possible value range (for example, including two interval values ​​17.6 and 26.4), and perform multiple simulations based on the selected multiple capacitance values ​​to test whether the protection device can pass the surge immunity test in the possible value range. When it passes, it is determined that it can pass the worst-case test.

[0150] Figure 5 is an exemplary schematic diagram of simulation results according to an embodiment of the present invention. Figure 5 In Figure 4 Exemplary simulation results of the circuit topology shown. The simulation results include: a clamping voltage curve 61 of an arbitrary behavior voltage source B5 of the simulated protection device, a voltage curve 62 of the load R1, a clamping current curve 63 of the arbitrary behavior voltage source B5, and a current curve 64 of the capacitor C2. Figure 6 is an exemplary schematic diagram of the test results according to an embodiment of the present invention. Figure 6 In Figure 4 Exemplary actual test results of the circuit topology shown. The actual test includes: a clamping voltage curve 71 of the protection device, a voltage curve 72 of the load R1, a clamping current curve 73 of the protection device, and a current curve 74 of the capacitor C2.

[0151] based on Figure 5 and Figure 6 It can be seen that the deviation between the simulation results and the test results is small (usually less than 10%), which further verifies the feasibility and accuracy of the simulation model.

[0152] The following describes a typical application of an embodiment of the present invention. When it is necessary to determine the immunity of a certain type of protection device, first determine the mapping relationship between the voltage and current of the protection device of the model, and then determine the simulation model of the protection device of the model based on the mapping relationship. Then, create a circuit topology including an interference generator (for example, a surge generator based on a standard surge test) and the simulation model of the model, simulate and run the circuit topology in a simulation tool, and finally determine the immunity of the protection device of the model based on the simulation results of the circuit topology.

[0153] The embodiments of the present invention also provide a device for determining the immunity of a protection device. Figure 7 is an exemplary structural diagram of an apparatus for determining the immunity of a protection device according to an embodiment of the present invention. Figure 7 As shown, the apparatus 700 for determining the immunity of a protection device includes:

[0154] A first determining module 701, configured to determine a mapping relationship between a voltage of a protection device and a current of the protection device;

[0155] The second determination module 702 is used to determine the simulation model of the protection device based on the mapping relationship; the creation module 703 is used to create a circuit topology including an interference generator and a simulation model; the simulation module 704 is used to simulate the running circuit topology; the third determination module 705 is used to determine the immunity of the protection device based on the simulation results of the circuit topology.

[0156] In one embodiment, the protection device is an MOV; the first determination module 701 is used to determine a mapping relationship formula of the MOV, the mapping relationship formula includes a power function, the dependent variable of the power function is the voltage of the MOV, and the independent variable of the power function is the current of the MOV; based on a relationship curve between the voltage and current of the MOV, at least two data points in the protection area of ​​the relationship curve are determined; based on the at least two data points, an exponential coefficient of the power function and a multiplication coefficient of the power function are determined; based on the exponential coefficient, the multiplication coefficient and the mapping relationship formula, the mapping relationship is determined.

[0157] In one embodiment, the protection device is a TVS; the first determination module 701 is used to determine the general formula of the mapping relationship of the TVS, the general formula of the mapping relationship includes a linear function, the dependent variable of the linear function is the voltage of the TVS, and the independent variable of the linear function is the current of the TVS; based on the relationship curve between the voltage and current of the TVS, at least two data points in the protection area of ​​the relationship curve are determined; based on the at least two data points, the slope and the constant term of the linear function are determined; based on the slope, the constant term and the general formula of the mapping relationship, the mapping relationship is determined.

[0158] In one embodiment, the protection device is a TVS; the first determination module 701 is used to determine the general formula of the mapping relationship of the TVS, the general formula of the mapping relationship includes a linear function, the dependent variable of the linear function is the voltage of the TVS, and the independent variable of the linear function is the current of the TVS; determine the maximum breakdown voltage, the maximum clamping voltage and the peak clamping current of the TVS; determine the slope of the linear function based on the maximum clamping voltage, the maximum breakdown voltage and the peak clamping current; determine the constant term of the linear function based on the maximum breakdown voltage; determine the mapping relationship based on the slope, the constant term and the general formula of the mapping relationship.

[0159] In one embodiment, the second determination module 702 is used to set the property parameters of the arbitrary behavior voltage source or the arbitrary behavior current source in the simulation tool based on the mapping relationship; and determine the arbitrary behavior voltage source or the arbitrary behavior current source as the simulation model of the protection device.

[0160] In one embodiment, the creation module 703 is used to couple an arbitrary behavior voltage source or an arbitrary behavior current source with a protection object to form a protection circuit in a simulation tool; in the simulation tool, couple an interference generator with the protection circuit to create a circuit topology.

[0161] In one implementation, the creation module 703 is configured to set a CDN between the interference generator and the protection circuit.

[0162] In one embodiment, the interference generator is a surge generator; the third determination module 705 is used to perform at least one of the following: when the simulation result indicates that during the surge immunity test, the clamping voltage of the protection device is greater than a predetermined safety voltage, determining that the surge immunity of the protection device is unqualified; when the simulation result indicates that during the surge immunity test, the clamping voltage of the protection device is less than a predetermined voltage threshold, determining that the surge immunity of the protection device is unqualified; when the simulation result indicates that during the surge immunity test, the clamping voltage of the protection device is less than or equal to a predetermined safety voltage and greater than or equal to a predetermined voltage threshold, determining that the surge immunity of the protection device is qualified.

[0163] In one embodiment, the simulation module 704 is used to simulate the circuit topology based on the tolerance range of the component parameters of the circuit topology; the third determination module 705 is used to determine the immunity of the protection device based on the simulation result range corresponding to the tolerance range.

[0164] The embodiment of the present invention further provides an electronic device having a processor-memory architecture. Figure 8 is a structural diagram of an electronic device according to an embodiment of the present invention. Figure 8As shown, the electronic device 800 includes a processor 801, a memory 802, and a computer program stored in the memory 802 and executable on the processor 801. When the computer program is executed by the processor 801, any of the above methods for determining the immunity of the protection device is implemented. Among them, the memory 802 can be specifically implemented as a variety of storage media such as an electrically erasable programmable read-only memory (EEPROM), a flash memory (Flash memory), and a programmable program read-only memory (PROM). The processor 801 can be implemented as including one or more central processing units or one or more field programmable gate arrays, wherein the field programmable gate array integrates one or more central processing unit cores. Specifically, the central processing unit or the central processing unit core can be implemented as a CPU, an MCU or a DSP, and so on.

[0165] It should be noted that not all steps and modules in the above processes and structure diagrams are necessary, and some steps or modules can be ignored according to actual needs. The execution order of each step is not fixed and can be adjusted as needed. The division of each module is only for the convenience of describing the functional division adopted. In actual implementation, a module can be implemented by multiple modules, and the functions of multiple modules can also be implemented by the same module. These modules can be located in the same device or in different devices.

[0166] The hardware modules in each embodiment can be implemented mechanically or electronically. For example, a hardware module may include a specially designed permanent circuit or logic device (such as a dedicated processor, such as an FPGA or ASIC) for performing a specific operation. The hardware module may also include a programmable logic device or circuit (such as a general-purpose processor or other programmable processor) temporarily configured by software to perform a specific operation. As for whether to implement the hardware module mechanically, or using a dedicated permanent circuit, or using a temporarily configured circuit (such as configured by software), it can be decided based on cost and time considerations.

[0167] The present invention also provides a machine-readable storage medium, storing instructions for making a machine perform the method as described in the present application. Specifically, a system or device equipped with a storage medium can be provided, on which a software program code for realizing the function of any of the embodiments described in the above embodiments is stored, and the computer (such as CPU, MCU or MPU) of the system or device is read out and executes the program code stored in the storage medium. In addition, the operating system etc. operated on the computer can also be completed part or all of the actual operation by the instruction based on the program code. The program code read out from the storage medium can also be written to the memory provided in the expansion board inserted into the computer or to the memory provided in the expansion unit connected to the computer, and then the control unit etc. installed on the expansion board or the expansion unit are made to perform part and all of the actual operation based on the instruction of the program code, so as to realize the function of any of the embodiments described in the above embodiments. The storage medium implementation for providing the program code includes a floppy disk, a hard disk, a magneto-optical disk, an optical disk (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), a magnetic tape, a non-volatile memory card and a ROM. Alternatively, the program code may be downloaded from a server computer or the cloud via a communications network.

[0168] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for determining the immunity of a protection device, characterized in that: include: Determining (101) a mapping relationship between a voltage of a protection device and a current of the protection device; Based on the mapping relationship, determining (102) a simulation model of the protection device; Creating (103) a circuit topology including an interference generator and the simulation model; Simulating and running (104) the circuit topology; Based on the simulation results of the circuit topology, the noise immunity of the protection device is determined (105).

2. The method according to claim 1, characterized in that: The protection device is a metal oxide varistor; The determining (101) of a mapping relationship between a voltage of a protection device and a current of the protection device comprises: Determine a general formula of a mapping relationship of the metal oxide varistor, wherein the general formula of the mapping relationship includes a power function, the dependent variable of the power function is the voltage of the metal oxide varistor, and the independent variable of the power function is the current of the metal oxide varistor; Based on a relationship curve between voltage and current of the metal oxide varistor, determining at least two data points in a protection zone of the relationship curve; Determining an exponential coefficient of the power function and a multiplication coefficient of the power function based on the at least two data points; The mapping relationship is determined based on the exponential coefficient, the multiplication coefficient and the general formula of the mapping relationship.

3. The method according to claim 1, characterized in that The protection device is a transient voltage suppression diode; The determining (101) of a mapping relationship between a voltage of a protection device and a current of the protection device comprises: Determine a mapping relationship formula of the transient voltage suppression diode, wherein the mapping relationship formula includes a linear function, the dependent variable of the linear function is the voltage of the transient voltage suppression diode, and the independent variable of the linear function is the current of the transient voltage suppression diode; Based on a relationship curve between voltage and current of the transient voltage suppressor diode, determining at least two data points in a protection zone of the relationship curve; Determining a slope and a constant term of the linear function based on the at least two data points; The mapping relationship is determined based on the slope, the constant term and the general formula of the mapping relationship.

4. The method according to claim 1, characterized in that: The protection device is a transient voltage suppression diode; The determining (101) of a mapping relationship between a voltage of a protection device and a current of the protection device comprises: Determine a mapping relationship formula of the transient voltage suppression diode, wherein the mapping relationship formula includes a linear function, the dependent variable of the linear function is the voltage of the transient voltage suppression diode, and the independent variable of the linear function is the current of the transient voltage suppression diode; Determining the maximum breakdown voltage, maximum clamping voltage and peak clamping current of the transient voltage suppression diode; Determining a slope of the linear function based on the maximum clamping voltage, the maximum breakdown voltage, and the peak clamping current; Based on the maximum breakdown voltage, determining a constant term of the linear function; The mapping relationship is determined based on the slope, the constant term and the general formula of the mapping relationship.

5. The method according to any one of claims 1 to 4, characterized in that The determining (102) of the simulation model of the protection device based on the mapping relationship includes: Based on the mapping relationship, setting the property parameters of the arbitrary behavior voltage source or the arbitrary behavior current source in the simulation tool; The arbitrary behavior voltage source or the arbitrary behavior current source is determined as a simulation model of the protection device.

6. The method according to claim 5, characterized in that The creating (103) of a circuit topology including an interference generator and the simulation model comprises: In the simulation tool, coupling the arbitrary behavior voltage source or the arbitrary behavior current source with a protection object of the protection device to form a protection circuit; In the simulation tool, the interference generator is coupled with the protection circuit to create the circuit topology.

7. The method according to claim 6, characterized in that The coupling of the interference generator to the protection circuit comprises: A coupling-decoupling network is provided between the interference generator and the protection circuit.

8. The method according to any one of claims 1 to 4, characterized in that The interference generator is a surge generator; The determining (105) of the noise immunity of the protection device based on the simulation result of the circuit topology includes at least one of the following: When the simulation result indicates that the clamping voltage of the protection device is greater than a predetermined safety voltage during the surge immunity test, it is determined that the surge immunity of the protection device is unqualified; When the simulation result indicates that the clamping voltage of the protection device is less than a predetermined voltage threshold during the surge immunity test, it is determined that the surge immunity of the protection device is unqualified; When the simulation result indicates that during the surge immunity test, the clamping voltage of the protection device is less than or equal to a predetermined safety voltage and greater than or equal to a predetermined voltage threshold, it is determined that the surge immunity of the protection device is qualified.

9. The method according to any one of claims 1 to 4, characterized in that: The simulation operation (104) of the circuit topology includes: Based on the tolerance range of the component parameters of the circuit topology, simulate and run the circuit topology; The determining (105) the noise immunity of the protection device based on the simulation result of the circuit topology includes: Based on a range of simulation results corresponding to the tolerance range, the noise immunity of the protection device is determined.

10. A device for determining the immunity of a protection device, characterized in that: include: A first determination module (701) is used to determine a mapping relationship between a voltage of a protection device and a current of the protection device; A second determination module (702) is used to determine a simulation model of the protection device based on the mapping relationship; A creation module (703) for creating a circuit topology including an interference generator and the simulation model; A simulation module (704), configured to simulate and run the circuit topology; The third determination module (705) is used to determine the noise immunity of the protection device based on the simulation result of the circuit topology.

11. The device according to claim 10, characterized in that The protection device is a metal oxide varistor; The first determination module (701) is used to determine a general formula of a mapping relationship of the metal oxide varistor, wherein the general formula of the mapping relationship includes a power function, wherein the dependent variable of the power function is the voltage of the metal oxide varistor, and the independent variable of the power function is the current of the metal oxide varistor; based on a relationship curve between the voltage and the current of the metal oxide varistor, determining at least two data points in a protection zone of the relationship curve; based on the at least two data points, determining an exponential coefficient of the power function and a multiplication coefficient of the power function; The mapping relationship is determined based on the exponential coefficient, the multiplication coefficient and the general formula of the mapping relationship.

12. The device according to claim 10, characterized in that The protection device is a transient voltage suppression diode; The first determination module (701) is used to determine a general formula of a mapping relationship of the transient voltage suppression diode, wherein the general formula of the mapping relationship includes a linear function, wherein the dependent variable of the linear function is the voltage of the transient voltage suppression diode, and the independent variable of the linear function is the current of the transient voltage suppression diode; based on a relationship curve between the voltage and the current of the transient voltage suppression diode, at least two data points in a protection zone of the relationship curve are determined; based on the at least two data points, a slope and a constant term of the linear function are determined; and based on the slope, the constant term and the general formula of the mapping relationship, the mapping relationship is determined.

13. The device according to claim 10, characterized in that The protection device is a transient voltage suppression diode; The first determination module (701) is used to determine a general formula of a mapping relationship of the transient voltage suppression diode, wherein the general formula of the mapping relationship includes a linear function, wherein the dependent variable of the linear function is the voltage of the transient voltage suppression diode, and the independent variable of the linear function is the current of the transient voltage suppression diode; determine the maximum breakdown voltage, the maximum clamping voltage and the peak clamping current of the transient voltage suppression diode; determine the slope of the linear function based on the maximum clamping voltage, the maximum breakdown voltage and the peak clamping current; determine the constant term of the linear function based on the maximum breakdown voltage; and determine the mapping relationship based on the slope, the constant term and the general formula of the mapping relationship.

14. The device according to any one of claims 10 to 13, characterized in that The second determination module (702) is used to set the property parameters of the arbitrary behavior voltage source or the arbitrary behavior current source in the simulation tool based on the mapping relationship; and determine the arbitrary behavior voltage source or the arbitrary behavior current source as the simulation model of the protection device.

15. The device according to claim 14, characterized in that The creation module (703) is used to couple the arbitrary behavior voltage source or the arbitrary behavior current source with the protection object to form a protection circuit in the simulation tool; and to couple the interference generator with the protection circuit to create the circuit topology in the simulation tool.

16. An electronic device, characterized in that: include: Processor (801); A memory (802), configured to store executable instructions of the processor (801); The processor (801) is used to read the executable instructions from the memory (802), and execute the executable instructions to implement the method for determining the immunity of a protection device according to any one of claims 1 to 9.

17. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the computer instructions are executed by a processor, the method for determining the immunity of a protection device according to any one of claims 1 to 9 is implemented.

18. A computer program product, characterized in that The invention comprises a computer program, which, when executed by a processor, implements the method for determining the immunity of a protection device according to any one of claims 1 to 9.

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