Fuse simulation system

Abstract

This application provides a fuse simulation system, comprising: an electrical model for simulating the current flowing through the fuse under different temperatures and outputting the current value; and a thermal model, which takes the current value output by the electrical model as input, simulates the temperature of the fuse under the current input, and outputs the temperature value; the temperature value is used as the input value of the electrical model. The fuse simulation system provided by this application includes an electrical model and a thermal model. The electrical model simulates the current flowing through the fuse at different temperatures, while the thermal model simulates the temperature of the fuse under different currents. The two models are coupled, achieving a dynamic simulation of the interaction between current and heat, which helps improve the accuracy of fuse application simulation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuse simulation, and particularly relates to a fuse simulation system. BACKGROUND

[0002] As a current protection device, a fuse is often connected in series with a circuit as a fuse body, and when the current value flowing through the fuse exceeds a specified value, the heat generated by the fuse itself melts the fuse body to disconnect the circuit to achieve circuit protection. In actual engineering applications, the characteristics of the fuse need to be accurately understood to ensure that the fuse can achieve ideal circuit protection. In related technologies, the heat modeling of the fuse is often performed according to specific parameters such as the size and material of the fuse, and the heat accumulation of the fuse under different currents is analyzed to evaluate the temperature rise and melting behavior of the fuse within a specific time. However, heat modeling is usually based on a fixed current value for analysis, and cannot effectively cope with the transient thermal effects caused by current fluctuations, resulting in a large deviation between the simulation results and the actual situation, and the performance of the fuse in actual applications cannot be accurately simulated. SUMMARY

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

[0004] The present application provides a fuse simulation system, comprising: an electrical model for simulating the current flowing through a fuse to be simulated at different temperatures and outputting a current value; a thermal model taking the current value output by the electrical model as input for simulating the temperature of the fuse to be simulated under the current input and outputting a temperature value; and the temperature value as an input value of the electrical model.

[0005] In some embodiments, the thermal model comprises: a controlled heat flow source for outputting heat flow, and the heat flow value output by the controlled heat flow source is equal to the square of the current value output by the electrical model; and a heat container connected between the heat source end and the heat sink end of the controlled heat flow source for simulating the heat generated when the heat flow output by the controlled heat flow source flows through the fuse to be simulated.

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

[0007] In some embodiments, the relationship between the current value and the heat is obtained according to i - i 2 t a data set, i - i 2 t the data set is obtained according to the data in the data manual, i -t is determined by a curve, wherein i is a current value, t is a melting time, i 2 t is a heat; the processor is configured to determine the heat corresponding to the current value output by the current electrical model according to i - i 2 t the data set.

[0008] In some embodiments, the processor is configured to configure the heat of the thermal container according to a fitting curve of the current value and the heat; the fitting curve is obtained according to i - i 2 t the data set.

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

[0010] In some embodiments, the fitting curve is:

[0011] ;

[0012] wherein, i is a current value, is a i 2 t , a , b , c , d are all constants.

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

[0014] In some embodiments, the function relationship of the fitting curve is:

[0015] ;

[0016] wherein, i is a current value, is a i 2 t , a , b , c are all constants.

[0017] In some embodiments, the function relationship of the fitting curve is a rational function or a polynomial function of the heat with respect to the current value.

[0018] In some embodiments, the processor is configured to determine the current value corresponding to the current output of the electrical model according to the interpolation operation of the data set. i-i 2 t The data set is subjected to an interpolation operation to determine the heat corresponding to the current value output by the electrical model at present; and the heat container is configured according to the heat corresponding to the current value output by the electrical model at present. The fuse simulation system provided by the application comprises 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 at different currents. The two models are coupled with each other, and the dynamic simulation of the mutual influence relationship between the current and the heat is realized, which is beneficial to improving the accuracy of the fuse application simulation process. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic diagram of a fuse simulation system according to an embodiment of the application;

[0020] Figure 2 FIG. 2 is a schematic diagram of a thermal model in the fuse simulation system according to an embodiment of the application;

[0021] Figure 3 FIG. 3 is a schematic diagram of a current-heat fitting curve according to an embodiment of the application;

[0022] Figure 4 FIG. 4 is a schematic diagram of a current-heat fitting curve according to another embodiment of the application;

[0023] Figure 5 FIG. 5 is a schematic diagram of a current-heat fitting curve according to another embodiment of the application;

[0024] Figure 6 FIG. 6 is a schematic diagram of a current-heat fitting curve according to another embodiment of the application;

[0025] Figure 7 FIG. 7 is a schematic diagram of an electrical model in the fuse simulation system according to an embodiment of the application;

[0026] Figure 8 FIG. 8 is a schematic diagram of a control method of the fuse simulation system according to an embodiment of the application.

[0027] REFERENCE SIGNS:

[0028] 10: electrical model; 11: fuse simulation resistor; 12: switching switch; 121: input end; 122: first output end; 123: second output end; 131: first power supply end; 132: second power supply end; 14: short-circuit wire; 151: capacitor; 152: fuse resistor; 16: current monitoring device; 20: thermal model; 201: controlled heat flow source; 202: heat container. DETAILED DESCRIPTION

[0029] The exemplary embodiments will be described in detail below with reference to the accompanying drawings.

[0030] In conjunction with Figure 1 As shown in the figure, the embodiment of the present application provides a fuse simulation system, which includes 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 outputs the current value. The thermal model 20 takes the current value output by the electrical model 10 as input, and is used to simulate the temperature of the fuse to be simulated under the current input, and outputs the temperature value. And the temperature value is taken as the input value of the electrical model 10.

[0031] The fuse simulation system provided by 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 of the fuse under different currents through the thermal model 20. The two are coupled with each other, realizing the dynamic simulation of the mutual influence relationship between the current and the heat, which is beneficial to improve the accuracy of the fuse application simulation process.

[0032] In conjunction with Figure 2 As shown in the figure, in some embodiments, the thermal model 20 includes a controlled heat flow source 201 and a heat container 202 connected between the heat source end and the heat sink end of the controlled heat flow source 201. Wherein, the controlled heat flow source 201 is used to output heat flow, the heat flow flows from the heat source end to the heat sink end, and the heat flow value output by the controlled heat flow source 201 is equal to the square of the current value output by the electrical model 10. The heat container 202 is used to simulate the heat generated when the heat flow output by the controlled heat flow source 201 flows through the fuse to be simulated, and the temperature of the heat container 202 is taken as the temperature output by the thermal model 20. In this way, the heat flow value output by the controlled heat flow source 201 is set to be equal to the square of the current value output by the electrical model 10, realizing the synchronous change of the thermal model 20 and the electrical model 10. And through the heat container 202, the simulation of the heat change of the fuse to be simulated can be realized simply and accurately, without the need to obtain the specific parameters such as the size and material of the fuse for modeling.

[0033] Here, the setting of the heat container 202 is further described. In some embodiments, the fuse simulation system further includes a processor, which is used to configure the heat of the heat container 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 is real-time changing, and the heat of the heat container 202 is configured according to the current value output by the electrical model 10 at present, so that the heat container 202 is constantly updated according to the current value output by the electrical model 10, which is beneficial to guarantee the accuracy of the heat simulated by the heat container 202, thereby improving the accuracy of the temperature value output by the thermal model, and further improving the accuracy of the overall fuse simulation system simulation.

[0034] 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 manual. i - t The curve is determined, among which, i This is the current value. t For circuit breaker time, i 2 t For heat. The processor is used to determine... i - i 2 t The data set determines the heat corresponding to the current value currently output by electrical model 10. i 2 t The datasheet of the fuse to be simulated contains information describing the relationship between current value and fusing time. i-t Curve. Based on this known... i- t The data in the curve can be processed to obtain multiple sets. i - i 2 t Data, i.e. i - i 2 t Data group. According to this i - i 2 t The data set determines the heat corresponding to the actual current value, which helps to ensure the accuracy of the final determined heat, thereby improving the accuracy of the configuration of the heat container 202.

[0035] In some embodiments, the processor according to i - i 2 t The data set determines the heat corresponding to the current value currently output by electrical model 10. i 2 t The process is as follows: the processor is used to configure the heat of the heat container 202 according to the fitting curve of current value and heat; the fitting curve is based on... i - i 2 t The data was obtained by fitting the dataset. i - i2 t The data in the data set is curve-fitted, and the fitted curve is taken as a reference actually used to determine the heat corresponding to the current value. According to the fitted curve, the heat corresponding to any current value can be obtained, which overcomes the defect that the current value can not have a corresponding heat due to the data dispersion in the data set. Moreover, after the fitted curve is obtained, it can be continuously applied in the heat configuration process of the heat container 202 in the thermal model 20 of the fuse to be simulated, and only data calling needs to be performed in the simulation process, which is beneficial to improving the data processing efficiency. i - i 2 t The data in the data set is curve-fitted, and the fitted curve is taken as a reference actually used to determine the heat corresponding to the current value. According to the fitted curve, the heat corresponding to any current value can be obtained, which overcomes the defect that the current value can not have a corresponding heat due to the data dispersion in the data set. Moreover, after the fitted curve is obtained, it can be continuously applied in the heat configuration process of the heat container 202 in the thermal model 20 of the fuse to be simulated, and only data calling needs to be performed in the simulation process, which is beneficial to improving the data processing efficiency.

[0036] In some embodiments, the function relationship of the fitted curve is an exponential function of the heat with respect to the current value. In this way, it is beneficial to better describe the actual trend of the data, thereby improving the accuracy of the final fitted result. Specifically, in some embodiments, the function relationship of the fitted curve is: wherein, i is the current value, is the heat, i 2 t , a , b , c , d are all constants, and e is a natural constant. As shown in FIG. 2B, the heat corresponding to the current value is obtained through the function relationship. Figure 3 - i - i 2 t When the data set is fitted, the goodness of fit of the curve can reach 0.998, which realizes the accurate description of the data relationship between the current and the heat.

[0037] In some embodiments, the function relationship of the fitted curve is a power function of the heat with respect to the current value. In this way, it is beneficial to accurately describe the actual trend of the data, thereby improving the accuracy of the final fitted result. Specifically, the function relationship of the fitted curve is: wherein, i is the current value, is the heat, i 2 t , a , b , c are all constants. As shown in FIG. 2C, the heat corresponding to the current value is obtained through the function relationship. Figure 4 - i - i 2 tWhen fitting the data set, the goodness of fit of the curve can reach 0.9935, and the data relationship between the current and the heat is accurately described.

[0038] In some embodiments, the function relationship of the fitting curve is a rational function of the heat with respect to the current value. In this way, the actual trend of the data is accurately described, and thus the accuracy of the final fitting result is improved. Specifically, the function relationship of the fitting curve is: wherein, i is the current value, is i 2 t , , , are all constants. As shown in Figure 5 , when fitting the i-i2t data set through the function relationship, the goodness of fit of the curve can reach 0.9874, and the data relationship between the current and the heat is accurately described.

[0039] In some embodiments, the function relationship of the fitting curve is a polynomial function of the heat with respect to the current value. In this way, the actual trend of the data is accurately described, and thus the accuracy of the final fitting result is improved. Specifically, the function relationship of the fitting curve is: wherein, i is the current value, is i 2 t , , , , are all constants. As shown in Figure 6 , when fitting the i-i2t data set through the function relationship, i - i 2 t the goodness of fit of the curve can reach 0.9494, and the data relationship between the current and the heat is accurately described.

[0040] In some embodiments, the processor is configured to determine the function relationship of the fitting curve according to i - i 2 tThe data set is subjected to an interpolation operation to determine the heat corresponding to the current value output by the electrical model at present, and a heat container is configured according to the heat corresponding to the current value output by the electrical model at present. The interpolation operation is a calculation manner for calculating unknown values between known data points by constructing a function or a model through the known data points. The interpolation operation does not introduce additional assumptions or errors, can provide more reliable calculation results, and is relatively simple in operation process, can realize fast estimation, and balances the accuracy and efficiency of the heat calculation process.

[0041] In the implementation process, the aforementioned curve fitting process and / or interpolation operation process can be realized by a computer including a memory, a processor, and a computer program stored on the memory and executable on the processor. In some embodiments, the aforementioned curve fitting process and / or interpolation operation process can be realized by a DSP (Digital Signal Processor), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device) containing a signal sampling conditioning circuit and an internal operation program. In some embodiments, the curve fitting process and / or interpolation operation process can also be realized by combining the two manners.

[0042] In combination Figure 7As shown, the internal structure of the electrical model 10 is illustrated. The electrical model 10 includes a power terminal, a fuse simulation resistor 11, a first branch, a second branch, and a switching switch 12. The fuse simulation resistor 11 is configured to have a resistance value of a fuse to be simulated. The power terminal includes a first power terminal 131 and a second power terminal 132 for connecting with an external power source. In some embodiments, the fuse model system includes a power supply as the external power source connected with the first power terminal 131 and the second power terminal 132 in the electrical model 10 to realize power supply to the electrical model 10. The first branch includes a short-circuit wire 14. The second branch is connected in parallel with the first branch and in series with the fuse simulation resistor 11 between the first power terminal 131 and the second power terminal 132. The second branch includes a capacitor 151 and a fuse resistor 152 connected in series. 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 realize simulation of the fuse breaking condition when the capacitor 151, the fuse resistor 152, and the fuse simulation resistor 11 are turned on with the power terminal. The switching switch 12 is connected in series with the first branch and the second branch between the first power terminal 131 and the second power terminal 132, for switching the power terminal between the first branch and the second branch. That is, the switching switch 12 is controlled to form a conduction loop of the fuse simulation resistor 11, the first branch, and the power terminal, at this time, the simulated fuse is connected normally and not blown. Or the switching switch 12 is controlled to form a conduction loop of the fuse simulation resistor 11, the second branch, and the power terminal, at this time, the simulated fuse is blown.

[0043] In some embodiments, the switching switch 12 is a single-pole double-throw switch, including an input terminal 121 and two output terminals, which are a first output terminal 122 and a second output terminal 123. The first output terminal 122 is connected with the first branch, and the second output terminal 123 is connected with 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 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 terminal. In this way, switching between different operating conditions of the fuse is realized. In some embodiments, the switching switch 12 is configured to make the power terminal conduct with the first branch when the temperature value output by the thermal model 20 is less than the blowing temperature of the fuse to be simulated. When the temperature value is greater than or equal to the blowing temperature, the power terminal is made to conduct with the second branch. In this way, by setting the switching condition of the switching switch 12, automatic switching of the simulated working condition according to the actual temperature value obtained by the current simulation is realized.

[0044] In some embodiments, the switch 12 is configured to connect the power supply end to the first branch in response to a start instruction indicating that the fuse simulation is to be started. That is, after the start instruction indicating that the fuse simulation is to be started, the switch 12 is controlled to connect the first branch to the power supply end, so that the normal state of the fuse is taken as the initial state of the simulation.

[0045] In some embodiments, the electrical model 10 further comprises a current monitoring device 16. The current monitoring device 16 is configured to monitor the current value of the first branch or the second branch that is currently in the conducting state, and the current monitoring device 16 is in communication connection with the thermal model 20. Specifically, the current monitoring device 16 is in communication connection with the thermal model 20 through the processor. The processor is configured to configure the controlled heat source 201 and the heat reservoir 202 according to the current value monitored by the current monitoring device 16.

[0046] In combination with Figure 8 As shown, after the modeling of the fuse simulation system as described above, the control method of the fuse simulation system comprises steps S11 to S14.

[0047] In step S11, the processor controls the switch to connect the power supply end to the first branch in response to a start instruction indicating that the fuse simulation is to be started. In this way, the normal state of the fuse is taken as the initial state of the simulation.

[0048] In step S12, the processor acquires the temperature value output by the thermal model.

[0049] The thermal model is in electrical connection with the processor, so as to realize the transmission of the temperature value data.

[0050] In step S13, the processor determines whether the temperature is greater than or equal to the melting temperature.

[0051] If yes, step S14 is executed; if no, step S11 is continuously executed, so as to keep the power supply end connected to the first branch.

[0052] In step S14, the processor controls the switch to connect the power supply end to the second branch.

[0053] In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

Claims

1. A fuse simulation system, characterized by, The system comprises: an electrical model for simulating current flowing through a fuse to be simulated at different temperatures and outputting a current value; a thermal model for simulating temperature of the fuse to be simulated at a current input, taking the current value outputted by the electrical model as input and outputting a temperature value; the temperature value is taken as an input value of the electrical model; the thermal model comprises: a controlled heat flow source for outputting heat flow, and a heat flow value outputted by the controlled heat flow source is equal to a square of the current value outputted by the electrical model; a heat container connected between a heat source end and a heat sink end of the controlled heat flow source for simulating heat generated when the heat flow outputted by the controlled heat flow source flows through the fuse to be simulated; the temperature value outputted by the thermal model is a temperature of the heat container; The fuse system further comprises: a processor for determining i-i 2 t data sets according to i-t curves in a data manual and performing data processing on the i-i 2 t data sets by curve fitting or interpolation operation to determine heat corresponding to a current value output by the electrical model at present and configuring the heat container with the heat. where i is the current value, t is the melting time, i 2 t is the heat.

2. The fuse simulation system of claim 1, wherein a function relationship of the fitting curve is an exponential function of heat with respect to the current value.

3. The fuse simulation system of claim 2, wherein, The fitting curve is: f(i) = a e b·i + c e d·i ; where i is the current value, f(i) is i 2 t, a, b, c, d are all constants.

4. The fuse simulation system of claim 1, wherein, a function relationship of the fitting curve is a power function of heat with respect to the current value.

5. The fuse simulation system of claim 4, wherein, The function relationship of the fitting curve is: f(i) = a*i b + c; where i is the current value, f(i) is i 2 t, a, b, c are constants.

6. The fuse simulation system of claim 1, wherein, a function relationship of the fitting curve is a rational function or a polynomial function of heat with respect to the current value.

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