Fuse simulation system

Abstract

The invention provides a fuse simulation system, and the system comprises an electrical model which is used for simulating the current flowing through a to-be-simulated fuse at different temperatures, and outputting a current value; the thermal model takes the current value output by the electrical model as input, and is used for simulating the temperature of the fuse to be simulated under the current current input and outputting a temperature value; the temperature value is used as an input value of the electrical model. The fuse simulation system provided by the invention comprises the electrical model and the thermal model, simulation of current conditions flowing through the fuse at different temperatures is realized through the electrical model, simulation of temperature conditions of the fuse at different currents is realized through the thermal model, and the electrical model and the thermal model are mutually coupled, so that dynamic simulation of a mutual influence relationship between the current and heat is realized; and the accuracy of the fuse application simulation process can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of fuse simulation, and in particular to a fuse simulation system. Background Art

[0002] As a current protection device, the fuse is often connected in series in the circuit as a fuse. When the current value flowing through the fuse exceeds the specified value, the heat generated by the fuse itself causes the fuse to melt and disconnect the circuit to achieve circuit protection. In actual engineering applications, it is necessary to accurately understand the characteristics of the fuse to ensure that the fuse achieves the ideal circuit protection function. In related technologies, the heat accumulation of the fuse under different currents is analyzed by performing thermal modeling of the fuse based on specific parameters such as the size and material of the fuse, so as to evaluate its temperature rise and melting behavior within a specific time. However, thermal modeling is usually based on a fixed current value for analysis, and cannot effectively deal with the transient thermal effects caused by current fluctuations, resulting in a large deviation between the simulation results and the actual situation, and cannot accurately simulate the performance of the fuse in actual applications. Summary of the invention

[0003] The present application provides a fuse simulation system to improve the accuracy of a fuse application performance simulation process.

[0004] The present application provides a fuse simulation system, including: an electrical model, used to simulate the current flowing through a fuse to be simulated at different temperatures, and output the current value; a thermal model, using the current value output by the electrical model as input, to simulate the temperature of the fuse to be simulated under the current current input, and output the temperature value; the temperature value serves as the input value of the electrical model.

[0005] In some embodiments, the thermal model includes: a controlled heat flux source, which is used to output heat flux, and the heat flux value output by the controlled heat flux source is equal to the square of the current value output by the electrical model; a thermal capacitor, which is connected between the heat source end and the heat sink end of the controlled heat flux source, and is used to simulate the heat generated when the heat flux output by the controlled heat flux source flows through the fuse to be simulated.

[0006] In some embodiments, the fuse simulation system further includes: a processor for configuring a thermally controlled heat flow source of the thermal capacitor according to a current value output by the electrical model and a relationship between the current value and heat.

[0007] In some embodiments, the relationship between current value and heat is based on i - i 2 t The data set obtained i - i 2 t The data set is based on the data sheet i -t The curve is determined by i is the current value, t is the fuse time, i 2 t for heat; the processor is used according to i - i 2 t The data set determines the amount of heat that corresponds to the current value output by the current model.

[0008] In some embodiments, the processor is used to configure the heat of the thermal capacitor according to the fitting curve of the current value and the heat; the fitting curve is based on i - i 2 t The data set is fitted.

[0009] In some embodiments, the functional relationship of the fitting curve is an exponential function of heat with respect to current value.

[0010] In some embodiments, the fitting curve is: ; in, i is the current value, for i 2 t , a , b , c , d are all constants.

[0011] In some embodiments, the functional relationship of the fitting curve is a power function of heat with respect to current value.

[0012] In some embodiments, the functional relationship of the fitting curve is: ; in, i is the current value, for i 2 t , a , b , c are all constants.

[0013] In some embodiments, the functional relationship of the fitting curve is a rational function or a polynomial function of heat with respect to current value.

[0014] In some embodiments, the processor is configured to: ii 2 tThe data group is interpolated to determine the heat corresponding to the current value currently output by the electrical model; and the thermal capacitor is configured according to the heat corresponding to the current value currently output by the electrical model. The fuse simulation system provided by the present application includes an electrical model and a thermal model. The electrical model is used to simulate the current flowing through the fuse at different temperatures, and the thermal model is used to simulate the temperature of the fuse under different currents. The two are coupled to each other to realize a dynamic simulation of the mutual influence relationship between current and heat, which is conducive to improving the accuracy of the fuse application simulation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a fuse simulation system provided by an embodiment of the present application; Figure 2 is a schematic diagram of a thermal model in a fuse simulation system provided by an embodiment of the present application; Figure 3 is a schematic diagram of a current value-heat fitting curve provided by an embodiment of the present application; Figure 4 is a schematic diagram of a current value-heat fitting curve provided by another embodiment of the present application; Figure 5 is a schematic diagram of a current value-heat fitting curve provided by another embodiment of the present application; Figure 6 is a schematic diagram of a current value-heat fitting curve provided by another embodiment of the present application; Figure 7 is a schematic diagram of an electrical model in a fuse simulation system provided by an embodiment of the present application; Figure 8 It is a schematic diagram of a control method of a fuse simulation system provided by an embodiment of the present application.

[0016] Reference numerals: 10: electrical model; 11: fuse simulation resistor; 12: switching switch; 121: input terminal; 122: first output terminal; 123: second output terminal; 131: first power supply terminal; 132: second power supply terminal; 14: short-circuit wire; 151: capacitor; 152: fuse resistor; 16: current monitoring device; 20: thermal model; 201: controlled heat flow source; 202: thermal capacitor. DETAILED DESCRIPTION

[0017] Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings.

[0018] Combination Figure 1As shown, the embodiment of the present application provides a fuse simulation system, including an electrical model 10 and a thermal model 20. The electrical model 10 is used to simulate the current flowing through the fuse to be simulated at different temperatures and output the current value. The thermal model 20 uses the current value output by the electrical model 10 as input to simulate the temperature of the fuse to be simulated under the current current input and output the temperature value. And the temperature value is used as the input value of the electrical model 10.

[0019] The fuse simulation system provided in the present application realizes the simulation of the current flowing through the fuse at different temperatures through the electrical model 10, and realizes the simulation of the temperature condition of the fuse under different currents through the thermal model 20. The two are coupled with each other to realize the dynamic simulation of the mutual influence relationship between current and heat, which is beneficial to improving the accuracy of the fuse application simulation process.

[0020] Combination Figure 2 As shown, in some embodiments, the thermal model 20 includes a controlled heat flux source 201 and a thermal capacitor 202 connected between the heat source end and the heat sink end of the controlled heat flux source 201. The controlled heat flux source 201 is used to output heat flux, and the heat flux flows from the heat source end to the heat sink end, and the heat flux value output by the controlled heat flux source 201 is equal to the square of the current value output by the electrical model 10. The thermal capacitor 202 is used to simulate the heat generated when the heat flux output by the controlled heat flux source 201 flows through the fuse to be simulated, and the temperature of the thermal capacitor 202 is used as the temperature output by the thermal model 20. In this way, the heat flux value output by the controlled heat flux source 201 is set to be equal to the square of the current value output by the electrical model 10, so that the thermal model 20 and the electrical model 10 are changed synchronously. Moreover, the thermal capacitor 202 can be used to concisely and accurately simulate the heat change of the fuse to be simulated, without obtaining the specific parameters such as the size and material of the fuse for modeling.

[0021] Here, the setting of the thermal capacitor 202 is further described. In some embodiments, the fuse simulation system further includes a processor, which is used to configure the heat of the thermal capacitor 202 according to the current value output by the electrical model 10 and the relationship between the current value and the heat. The current value output by the electrical model 10 changes in real time. The heat of the thermal capacitor 202 is configured according to the current value currently output by the electrical model 10, so that the thermal capacitor 202 is continuously updated according to the current value output by the electrical model 10, which is conducive to ensuring the accuracy of the heat simulated by the thermal capacitor 202, thereby improving the accuracy of the temperature value output by the thermal model, and further improving the accuracy of the simulation of the overall fuse simulation system.

[0022] Specifically, in some embodiments, the relationship between the current value and the heat is based on i - i 2 t The data set obtained i -i 2 t The data set is based on the data sheet i - t The curve is determined by i is the current value, t is the fuse time, i 2 t The processor is used to i - i 2 t The data set determines the heat corresponding to the current value currently output by the electrical model 10 i 2 t The data sheet of the fuse to be simulated contains the corresponding relationship between the current value and the melting time. it Curve. According to this known i- t The data in the curve can be processed to obtain multiple groups i - i 2 t Data, that is i - i 2 t Data set. i - i 2 t The data set determines the heat corresponding to the actual current value, which is helpful to ensure the accuracy of the heat finally determined, thereby improving the accuracy of the configuration of the thermal capacitor 202.

[0023] In some embodiments, the processor i - i 2 t The data set determines the heat corresponding to the current value currently output by the electrical model 10 i 2 t The specific process is as follows: the processor is used to configure the heat of the thermal capacitor 202 according to the fitting curve of the current value and the heat; the fitting curve is based on i - i 2 t The data set is fitted. i - i 2 t The data in the data group are curve-fitted, and the fitted curve is used as the actual basis for determining the heat corresponding to the current value. The heat corresponding to any current value can be obtained according to the fitted curve, overcoming the problem ofi - i 2 t The data in the data group is discrete, which may cause the current current value to have no corresponding heat. In addition, after the fitting curve is obtained, it can be continuously applied to the heat configuration process of the thermal capacitor 202 in the thermal model 20 of the fuse to be simulated. During the simulation process, only data call is required, which is conducive to improving data processing efficiency.

[0024] In some embodiments, the functional relationship of the fitting curve is an exponential function of the heat with respect to the current value. This is conducive to better describing the actual trend of the data, thereby improving the accuracy of the final fitting result. Specifically, in some embodiments, the functional relationship of the fitting curve is: .in, i is the current value, for i 2 t , a , b , c , d are all constants, and e is a natural constant. Figure 3 As shown, through this functional relationship i - i 2 t When the data set is fitted, the curve fitting goodness can reach 0.998, achieving an accurate description of the data relationship between current and heat.

[0025] In some embodiments, the functional relationship of the fitting curve is a power function of the heat with respect to the current value. This is conducive to accurately describing the actual trend of the data, thereby improving the accuracy of the final fitting result. Specifically, the functional relationship of the fitting curve is: .in, i is the current value, for i 2 t , a , b , c are constants. Figure 4 As shown, through this functional relationship i - i 2 t When the data set is fitted, the goodness of fit of the curve can reach 0.9935, achieving an accurate description of the data relationship between current and heat.

[0026] In some embodiments, the functional relationship of the fitting curve is a rational function of heat with respect to the current value. This is helpful to accurately describe the actual trend of the data, thereby improving the accuracy of the final fitting result. Specifically, the functional relationship of the fitting curve is: .in, i is the current value, for i 2 t , , , are constants. Figure 5 As shown, when the i-i2t data set is fitted by this functional relationship, the curve fitting goodness can reach 0.9874, achieving an accurate description of the data relationship between current and heat.

[0027] In some embodiments, the functional relationship of the fitting curve is a polynomial function of heat with respect to the current value. This is conducive to accurately describing the actual trend of the data, thereby improving the accuracy of the final fitting result. Specifically, the functional relationship of the fitting curve is: .in, i is the current value, for i 2 t , , , , are constants. Figure 6 As shown, through this functional relationship i - i 2 t When the data set is fitted, the curve fitting goodness can reach 0.9494, achieving an accurate description of the data relationship between current and heat.

[0028] In some embodiments, the processor is configured to: i - i 2 t The data group is interpolated to determine the heat corresponding to the current value currently output by the electrical model; and the heat container is configured according to the heat corresponding to the current value currently output by the electrical model. Interpolation is a calculation method that constructs a function or model through existing data points to infer the unknown values ​​between known data points. The interpolation method does not introduce additional assumptions or errors, and can provide more reliable calculation results; at the same time, the calculation process is relatively simple, and can achieve rapid estimation, taking into account the accuracy and efficiency of the heat calculation process.

[0029] In the implementation process, the aforementioned curve fitting process and / or interpolation operation process can be implemented by a computer and a computer program including a memory, a processor, and a computer program stored in the memory and running on the processor. In some embodiments, the aforementioned curve fitting process and / or interpolation operation process can be implemented by a DSP (Digital Signal Processor) including a signal sampling and conditioning circuit, an FPGA (Field-Programmable Gate Array) or a CPLD (Complex Programmable Logic Device) and an internal operation program. In some embodiments, the curve fitting process and / or interpolation operation process can also be implemented in combination with the two methods.

[0030] Combination Figure 7 As shown, the internal structure of the electrical model 10 is explained. The electrical model 10 includes a power supply terminal, a fuse simulation resistor 11, a first branch, a second branch and a switch 12. The resistance of the fuse simulation resistor 11 is configured as the resistance of the fuse to be simulated. The power supply terminal includes a first power supply terminal 131 and a second power supply terminal 132, which are used to connect to an external power supply. In some embodiments, the fuse model system includes a power supply, which is connected to the first power supply terminal 131 and the second power supply terminal 132 in the electrical model 10 as the external power supply to realize power supply to the electrical model 10. The first branch includes a short-circuit wire 14. After the second branch is connected in parallel with the first branch, it is connected in series with the fuse simulation resistor 11 between the first power supply terminal 131 and the second power supply terminal 132. The second branch includes a capacitor 151 and a fuse resistor 152 connected in series. Among them, the capacitance value of the capacitor 151 and the resistance value of the fuse resistor 152 are determined according to the discharge characteristics of the fuse to be simulated, so as to simulate the fuse breaking condition when the capacitor 151, the fuse resistor 152 and the fuse simulation resistor 11 are connected to the power supply end. The switching switch 12 is connected in series with the first branch and the second branch between the first power supply end 131 and the second power supply end 132, and is used to switch the power supply end between the first branch and the second branch. That is, the switching switch 12 is controlled to form a conductive loop between the fuse simulation resistor 11, the first branch and the power supply end, and at this time, the simulated fuse connection is normal and not blown. Or the switching switch 12 is controlled to form a conductive loop between the fuse simulation resistor 11, the second branch and the power supply end, and at this time, the fuse blowing condition is simulated.

[0031] In some embodiments, the switching switch 12 is a single-pole double-throw switch, including an input terminal 121 and two output terminals, the output terminals are respectively a first output terminal 122 and a second output terminal 123. The first output terminal 122 is connected to the first branch, and the second output terminal 123 is connected to the second branch. When the single-pole double-throw switch is placed at the first output terminal 122, the first branch forms a conduction loop with the power supply terminal. When the single-pole double-throw switch is placed at the second output terminal 123, the second branch forms a conduction loop with the power supply terminal. In this way, the switching between the simulations of different operating conditions of the fuse is realized. In some embodiments, the switching switch 12 is configured to make the power supply terminal and the first branch conductive when the temperature value output by the thermal model 20 is less than the fusing temperature of the fuse to be simulated. When the temperature value is greater than or equal to the fusing temperature, the power supply terminal is conductive with the second branch. In this way, by setting the switching condition of the switching switch 12, the automatic switching of the simulated working condition according to the actual temperature value obtained by the current simulation is realized.

[0032] In some embodiments, the switch 12 is configured to connect the power supply end with the first branch in response to a start instruction indicating the start of the fuse simulation. That is, after the start instruction of the fuse simulation, the switch 12 is controlled to connect the first branch with the power supply end, and the normal state of the fuse is used as the initial state of the simulation.

[0033] In some embodiments, the electrical model 10 further includes a current monitoring device 16. The current monitoring device 16 is used to monitor the current value of the first branch or the second branch that is currently in the on state, and the current monitoring device 16 is communicatively connected to the thermal model 20. Specifically, the current monitoring device 16 is communicatively connected to the thermal model 20 through a processor. The processor is used to configure the controlled heat flow source 201 and the thermal capacitor 202 according to the current value monitored by the current monitoring device 16.

[0034] Combination Figure 8 As shown, after completing the aforementioned modeling of the fuse simulation system, the control method of the fuse simulation system includes steps S11 to S14.

[0035] In step S11, the processor controls the switch to connect the power supply end with the first branch circuit in response to the start instruction indicating the start of the fuse simulation, so as to simulate the normal condition of the fuse.

[0036] Step S12: the processor obtains the temperature value output by the thermal model.

[0037] The thermal model is electrically connected to the processor to achieve the transmission of temperature value data.

[0038] Step S13: the processor determines whether the temperature is greater than or equal to the fusing temperature.

[0039] If yes, then execute step S14; if no, then continue to execute step S11 to keep the power supply end and the first branch in a conducting state.

[0040] In step S14, the processor controls the switch to connect the power supply end to the second branch.

[0041] In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A fuse simulation system, characterized in that: include: An electrical model, used to simulate the current flowing through the fuse to be simulated at different temperatures and output the current value; A thermal model, which uses the current value output by the electrical model as input, is used to simulate the temperature of the fuse to be simulated under the current current input, and outputs the temperature value; The temperature value is used as an input value of the electrical model.

2. The fuse simulation system according to claim 1, characterized in that: The thermal model includes: A controlled heat flux source, used to output a heat flux, wherein the heat flux value output by the controlled heat flux source is equal to the square of the current value output by the electrical model; The thermal capacitor is connected between the heat source end and the heat sink end of the controlled heat flux source and is used to simulate the heat generated when the heat flux output by the controlled heat flux source flows through the fuse to be simulated.

3. The fuse simulation system according to claim 2, characterized in that: The fuse simulation system further comprises: The processor is used to configure the heat of the thermal capacitor according to the current value output by the electrical model and the relationship between the current value and the heat.

4. The fuse simulation system according to claim 3, characterized in that: The relationship between the current value and the heat is based on i - i 2 t The data set obtained i - i 2 t The data set is based on the data sheet i - t The curve is determined by i is the current value, t is the fuse time, i 2 t for heat; The processor is used to i - i 2 t The data set identifies a heat amount corresponding to a current value currently being output by the electrical model.

5. The fuse simulation system according to claim 4, characterized in that: The processor is used to configure the heat of the thermal capacitor according to the fitting curve of the current value and the heat; the fitting curve is based on i - i 2 t The data set is fitted.

6. The fuse simulation system according to claim 5, characterized in that: The functional relationship of the fitting curve is an exponential function of heat with respect to current value.

7. The fuse simulation system according to claim 6, characterized in that: The fitting curve is: ； in, i is the current value, for i 2 t , a , b , c , d are all constants.

8. The fuse simulation system according to claim 5, characterized in that: The functional relationship of the fitting curve is a power function of heat with respect to current value.

9. The fuse simulation system according to claim 8, characterized in that: The functional relationship of the fitting curve is: ； in, i is the current value, for i 2 t , a , b , c are all constants.

10. The fuse simulation system according to claim 5, characterized in that: The functional relationship of the fitting curve is a rational function or a polynomial function of heat with respect to current value.

11. The fuse simulation system according to claim 4, characterized in that: The processor is used to ii 2 t The data group is interpolated to determine the heat corresponding to the current value currently output by the electrical model; and the thermal capacitor is configured according to the heat corresponding to the current value currently output by the electrical model.

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