Energy consumption resistor temperature on-line monitoring method and related device

Abstract

The invention relates to the technical field of power electronic devices, in particular to an energy consumption resistor temperature online monitoring method and related device.The method comprises the steps that the equivalent heat capacity and the equivalent heat resistance of an energy consumption resistor to be measured are obtained, and the actually measured power of the energy consumption resistor in the current period, the reference temperature of the last period and the preset period time are obtained; according to the equivalent heat capacity, the equivalent heat resistance, the cycle time, the actually measured power, the reference temperature and a preset mapping relational expression of the energy consumption resistor, the temperature of the energy consumption resistor is calculated; the equivalent heat capacity, the equivalent heat resistance and the period time of the energy consumption resistor, the actually measured power of the current period, the reference temperature of the previous period and the mapping relation among the actual temperature of the current period of the energy consumption resistor are embedded in the mapping relation; according to the comparison result of the actual temperature of the current period and the preset temperature threshold value, the monitoring result of the energy consumption resistor in the current period is output, and the technical problem that the temperature of the energy consumption resistor cannot be effectively monitored in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, in particular to a kind of energy dissipation resistance temperature on-line monitoring method and related device. BACKGROUND

[0002] With the development of power electronics technology, the voltage and current level of high-power converter device gradually increases. Controllable switching energy dissipation circuit is widely used in high-power converter device to meet the needs of consuming excess energy in braking, fault and other working conditions, and avoiding system overvoltage. When the energy dissipation resistor consumes energy, it will convert the excess energy into heat energy, so there will be a temperature rise. In order to avoid excessive energy consumption, which leads to overheating and damage of energy dissipation resistor, and even affects the surrounding equipment, the temperature of energy dissipation resistor needs to be monitored and protected in time.

[0003] The traditional energy dissipation resistor temperature monitoring method is measured by sensor. But because the energy dissipation resistor itself is a live body, the temperature sensor of metal material placed inside the resistor will have insulation potential problem, and the optical fiber sensor needs a more complex demodulator, which increases the cost and layout compactness of power equipment. If the sensor is not placed outside the resistor body, there will be obvious measurement delay, and it is difficult to realize timely and effective over-temperature protection. Therefore, how to effectively monitor the temperature of energy dissipation resistor becomes a technical problem to be solved. SUMMARY

[0004] The present application provides an energy dissipation resistor temperature on-line monitoring method and related device, which solves the technical problem that the prior art cannot effectively monitor the temperature of energy dissipation resistor.

[0005] In one aspect, the present application provides an energy dissipation resistor temperature on-line monitoring method, comprising:

[0006] The equivalent heat capacity and equivalent thermal resistance of the energy dissipation resistor to be measured are obtained, and the measured power of the current period, the reference temperature of the last period and the preset period time of the energy dissipation resistor are obtained;

[0007] According to the equivalent heat capacity and equivalent thermal resistance of the energy dissipation resistor, the period time, the measured power, the reference temperature and the preset mapping relationship formula, the actual temperature of the current period of the energy dissipation resistor is calculated; The mapping relationship between the equivalent heat capacity and equivalent thermal resistance of the energy dissipation resistor, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the current period of the energy dissipation resistor is embedded in the mapping relationship formula;

[0008] According to the comparison result of the actual temperature of the current period and the preset temperature threshold, the monitoring result of the current period of the energy dissipation resistor is output.

[0009] Optionally, the obtaining the equivalent thermal capacity and the equivalent thermal resistance of the energy consumption resistor to be measured comprises:

[0010] constructing a thermal resistance and thermal capacity equivalent model of the energy consumption resistor;

[0011] determining the equivalent thermal capacity and the equivalent thermal resistance of the energy consumption resistor according to the thermal resistance and thermal capacity equivalent model.

[0012] Optionally, the calculating the actual temperature of the current period of the energy consumption resistor according to the equivalent thermal capacity, the equivalent thermal resistance of the energy consumption resistor, the period time, the measured power, the reference temperature and a preset mapping relationship comprises:

[0013] dividing the product of the equivalent thermal resistance of the energy consumption resistor and the period time by the sum of the product of the equivalent thermal capacity and the equivalent thermal resistance of the energy consumption resistor and the period time, to obtain a first parameter;

[0014] multiplying the first parameter by the measured power and adding the reference temperature of the last period to obtain the actual temperature of the current period of the energy consumption resistor.

[0015] Optionally, the obtaining the reference temperature of the last period comprises:

[0016] dividing the product of the equivalent thermal capacity and the equivalent thermal resistance of the energy consumption resistor by the sum of the product of the equivalent thermal capacity and the equivalent thermal resistance of the energy consumption resistor and the period time, to obtain a second parameter;

[0017] multiplying the second parameter by the actual temperature of the last period of the energy consumption resistor to obtain the reference temperature of the last period of the energy consumption resistor.

[0018] Optionally, the temperature threshold comprises a first temperature threshold and a second temperature threshold, and the outputting the monitoring result of the current period of the energy consumption resistor according to the comparison result of the actual temperature of the current period and the preset temperature threshold comprises:

[0019] when the temperature of the energy consumption resistor is not less than the first temperature threshold, and the duration that the temperature of the energy consumption resistor is not less than the first temperature threshold is not less than a preset time threshold, determining that the energy consumption resistor is abnormal, stopping the use of the energy consumption resistor and issuing an alarm;

[0020] when the temperature of the energy consumption resistor is not greater than the second temperature threshold, and the duration that the temperature of the energy consumption resistor is not greater than the preset second temperature threshold is not less than a preset time threshold, determining that the energy consumption resistor is normal and using the energy consumption resistor.

[0021] The application further provides a kind of energy dissipation resistance temperature on-line monitoring circuit, comprising: energy dissipation circuit, analog-digital conversion sampling circuit, main control module, switch control module;The energy dissipation circuit includes energy dissipation resistance and controllable switching device in series with the energy dissipation resistance;

[0022] The input end of the analog-digital conversion sampling circuit is connected with the two ends of the energy dissipation resistance respectively, for collecting the voltage across the energy dissipation resistance;

[0023] The output end of the main control module and the analog-digital conversion sampling circuit are used to receive the voltage across the energy dissipation resistance, and calculate the measured power of the current period of the energy dissipation resistance according to the voltage across the energy dissipation resistance and the resistance value of the energy dissipation resistance obtained in advance, and obtain the equivalent heat capacity, equivalent thermal resistance of the energy dissipation resistance, preset period time and reference temperature of the last period of the energy dissipation resistance, and calculate the actual temperature of the current period of the energy dissipation resistance according to the equivalent heat capacity, equivalent thermal resistance of the energy dissipation resistance, the period time, the measured power, the reference temperature and the preset mapping relationship, and output the monitoring result of the current period of the energy dissipation resistance according to the comparison result of the actual temperature of the current period and the preset temperature threshold value;

[0024] The switch control module is connected with the controllable switching device and the main control module respectively, for disconnecting the controllable switching device when receiving the cut-off instruction output by the main control module, and for turning on the controllable switching device when receiving the input instruction output by the main control module;

[0025] The mapping relationship in the mapping relationship formula is embedded between the equivalent heat capacity, equivalent thermal resistance of the energy dissipation resistance, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the current period of the energy dissipation resistance.

[0026] The application further provides a kind of energy dissipation resistance temperature on-line monitoring device, comprising:

[0027] The acquisition module is used to acquire the equivalent heat capacity and equivalent thermal resistance of the energy dissipation resistance to be measured, and acquire the measured power of the current period, the reference temperature of the last period and the preset period time of the energy dissipation resistance;

[0028] The calculation module is used to calculate the actual temperature of the current period of the energy dissipation resistance according to the equivalent heat capacity, equivalent thermal resistance of the energy dissipation resistance, the period time, the measured power, the reference temperature and the preset mapping relationship;The mapping relationship in the mapping relationship formula is embedded between the equivalent heat capacity, equivalent thermal resistance of the energy dissipation resistance, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the current period of the energy dissipation resistance.

[0029] a monitoring module configured to output a monitoring result of the current period of the energy consumption resistor according to a comparison result of the actual temperature of the current period and a preset temperature threshold.

[0030] Optionally, the obtaining module comprises:

[0031] a constructing unit configured to construct a thermal resistance and thermal capacity equivalent model of the energy consumption resistor;

[0032] a determining unit configured to determine an equivalent thermal capacity and an equivalent thermal resistance of the energy consumption resistor according to the thermal resistance and thermal capacity equivalent model.

[0033] In another aspect, the present application provides an electronic device, which comprises a processor and a memory:

[0034] The memory is configured to store program codes and transmit the program codes to the processor.

[0035] The processor is configured to execute the method according to the instructions in the program codes.

[0036] In another aspect, the present application provides a computer readable storage medium, which is configured to store program codes for executing the method.

[0037] From the above technical solutions, the present application has the following advantages:

[0038] The present application provides an online temperature monitoring method for energy consumption resistor, which comprises: obtaining the equivalent thermal capacity and the equivalent thermal resistance of the energy consumption resistor to be measured, and obtaining the measured power of the current period of the energy consumption resistor, the reference temperature of the last period and the preset period time; calculating the actual temperature of the current period of the energy consumption resistor according to the equivalent thermal capacity and the equivalent thermal resistance of the energy consumption resistor, the period time, the measured power, the reference temperature and a preset mapping relationship; the mapping relationship is embedded with the mapping relationship between the equivalent thermal capacity and the equivalent thermal resistance of the energy consumption resistor, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the current period of the energy consumption resistor; outputting the monitoring result of the current period of the energy consumption resistor according to the comparison result of the actual temperature of the current period and a preset temperature threshold.

[0039] In the application, the equivalent thermal capacity and the equivalent thermal resistance of the energy consumption resistor to be measured are obtained, so that the equivalent of the thermal circuit conversion circuit of the energy consumption resistor is realized, and the corresponding equivalent thermal capacity and equivalent thermal resistance are determined, which provides effective data support for monitoring the temperature of the energy consumption resistor; the measured power of the energy consumption resistor is obtained, the real-time collection of the power of the energy consumption resistor is realized, and the reference temperature of the energy consumption resistor in the previous period and the period time are obtained, which provides effective data support for monitoring the temperature of the energy consumption resistor in the current period; and according to the mapping relationship between the equivalent thermal capacity, the equivalent thermal resistance, the period time, the measured power, the reference temperature of the energy consumption resistor, and the preset mapping relationship of the equivalent thermal capacity, the equivalent thermal resistance, the period time, the measured power in the current period, the reference temperature in the previous period and the actual temperature of the energy consumption resistor in the current period, the temperature of the energy consumption resistor is calculated, so that the actual temperature value of the energy consumption resistor in the current period is quickly and accurately obtained, and according to the comparison result of the actual temperature in the current period and the preset temperature threshold, the monitoring result of the energy consumption resistor in the current period is output, the temperature monitoring of the energy consumption resistor in the current period is realized, so as to avoid the delay measurement and low measurement accuracy caused by the existing energy consumption resistor temperature measurement technology, realize the effective online temperature monitoring of the energy consumption resistor, and provide effective technical support for realizing the fast over-temperature protection of the energy consumption resistor and improving the operation safety of the power equipment. Therefore, the application as a whole solves the technical problem that the temperature of the energy consumption resistor cannot be effectively monitored in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 A flowchart of a kind of energy consumption resistor temperature online monitoring method provided by the embodiment of the application;

[0042] Figure 2 A flowchart of a kind of energy consumption resistor temperature online monitoring method provided by another embodiment of the application;

[0043] Figure 3 A principle diagram of a kind of energy consumption resistor temperature online monitoring method provided by the embodiment of the application;

[0044] Figure 4 An energy consumption resistor temperature-time variation curve diagram provided by the application example;

[0045] Figure 5A structure block diagram of a kind of energy consumption resistance temperature on-line monitoring device provided in the embodiment of the application. DETAILED DESCRIPTION

[0046] The embodiment of the application provides an energy consumption resistance temperature on-line monitoring method and related device, to solve the technical problem that the temperature of energy consumption resistance cannot be effectively monitored in the prior art.

[0047] To make the application purpose, features and advantages of the application more obvious and easy to understand, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the following described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0048] Please refer to Figure 1 The embodiment of the application provides an energy consumption resistance temperature on-line monitoring method, which comprises the following steps of:

[0049] 101, the equivalent heat capacity of the energy consumption resistance to be measured, the equivalent thermal resistance is obtained, and the measured power of the current period of the energy consumption resistance, the reference temperature of the last period and the preset period time are obtained.

[0050] It should be noted that the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistance to be measured are determined based on the thermal resistance and heat capacity equivalent model of the energy consumption resistance. The thermal resistance and heat capacity equivalent model of the energy consumption resistance is obtained by fitting the simulation obtained energy consumption resistance temperature-time curve. The measured power of the energy consumption resistance refers to the power consumed by the energy consumption resistance in real time, which can be collected by using a sampling circuit to collect the voltage across the energy consumption resistance, and the resistance value of the energy consumption resistance itself is calculated. The period time is used to represent the time interval of the temperature monitoring of the energy consumption resistance each time, which is set according to the actual monitoring requirement. In an example, the period time can be 50us.

[0051] In the embodiment, the temperature of the energy consumption resistance is monitored once every period. Among them, the current period refers to the time period corresponding to the current step 101. Taking the current period as the division reference, according to the time sequence, the last period refers to the period before the current period. The reference temperature of the last period refers to the temperature value calculated by the equivalent heat capacity, the equivalent thermal resistance and the temperature of the energy consumption resistance calculated in the last period, which is used to participate in the calculation of the temperature of the energy consumption resistance in the current period.

[0052] It should be noted that the reference temperature of the last period can be calculated and stored in the information storage module in advance after the actual temperature of the energy consumption resistor is monitored in the last period, and the reference temperature of the last period can be obtained by calling the information storage module when step 101 is performed, or the reference temperature of the last period can be calculated in parallel when step 101 is performed.

[0053] In one embodiment, the step of obtaining the reference temperature of the last period comprises:

[0054] S1, the product of the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor is divided by the sum of the product of the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor and the period time, to obtain the second parameter;

[0055] It should be noted that when calculating the reference temperature of the last period, the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor are obtained in advance, the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor are multiplied to obtain a product, and the product is divided by the sum of the product of the equivalent heat capacity and the equivalent thermal resistance and the period time, to obtain the second parameter, that is, the expression of the second parameter is:

[0056]

[0057] Wherein, C t is the equivalent capacitance, R t is the equivalent thermal resistance, and T is the period time.

[0058] S2, the second parameter is multiplied by the actual temperature of the energy consumption resistor in the last period to obtain the reference temperature of the energy consumption resistor in the last period.

[0059] It should be noted that the actual temperature of the energy consumption resistor in the last period refers to the actual temperature obtained by using the equivalent heat capacity, the equivalent thermal resistance, the measured power of the last period, and the reference temperature of the last period and the mapping relationship formula of the last period in the last period. It can be understood that if the current period is the first period to start monitoring the temperature of the energy consumption resistor, the actual temperature of the last period used in the reference temperature of the last period refers to the initial ambient temperature.

[0060] 102, according to the equivalent heat capacity, the equivalent thermal resistance, the period time, the measured power, the reference temperature and the preset mapping relationship formula, the actual temperature of the energy consumption resistor in the current period is calculated; the mapping relationship formula is embedded with the mapping relationship between the equivalent heat capacity, the equivalent thermal resistance, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the energy consumption resistor in the current period.

[0061] It should be noted that, since the mapping relationship formula is embedded with the mapping relationship between the equivalent heat capacity, the equivalent thermal resistance, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the energy-consuming resistor in the current period, based on this, by inputting the equivalent heat capacity, the equivalent thermal resistance and the measured power of the energy-consuming resistor into the mapping relationship formula, the corresponding temperature value of the energy-consuming resistor is calculated.

[0062] 103. According to the comparison result of the actual temperature of the current period and the preset temperature threshold, the monitoring result of the energy-consuming resistor in the current period is output.

[0063] It should be noted that, after the actual temperature of the current period is calculated, the actual temperature of the current period is compared with the preset temperature threshold, and the normal state or abnormal state of the energy-consuming resistor is determined based on the comparison result, and an alarm prompt is issued when it is abnormal, thereby realizing the temperature monitoring of the energy-consuming resistor in the current period.

[0064] As can be seen from the above, the equivalent heat capacity and the equivalent thermal resistance of the energy-consuming resistor to be measured are obtained, thereby realizing the equivalent of the thermal circuit conversion circuit of the energy-consuming resistor, and the corresponding equivalent heat capacity and equivalent thermal resistance are determined, which provides effective data support for monitoring the temperature of the energy-consuming resistor. The measured power of the energy-consuming resistor is obtained, the real-time collection of the power of the energy-consuming resistor is realized, and the reference temperature of the energy-consuming resistor in the last period and the period time are obtained, which provides effective data support for monitoring the temperature of the energy-consuming resistor in the current period. According to the equivalent heat capacity, the equivalent thermal resistance, the period time, the measured power, the reference temperature and the preset mapping relationship formula embedded with the mapping relationship between the equivalent heat capacity, the equivalent thermal resistance, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the energy-consuming resistor in the current period, the temperature of the energy-consuming resistor is calculated, thereby quickly and accurately obtaining the actual temperature value of the energy-consuming resistor in the current period, and according to the comparison result of the actual temperature of the current period and the preset temperature threshold, the monitoring result of the energy-consuming resistor in the current period is output, realizing the temperature monitoring of the energy-consuming resistor in the current period, thereby avoiding the problem of delayed measurement caused by sensor measurement in the existing energy-consuming resistor temperature measurement, realizing effective online monitoring of the temperature of the energy-consuming resistor, providing effective technical support for realizing fast over-temperature protection of the energy-consuming resistor and improving the operation safety of the power equipment. The method is simple, easy to implement and low in cost. Therefore, the present application solves the technical problem that the temperature of the energy-consuming resistor cannot be effectively monitored in the prior art.

[0065] Please refer to Figure 2 The energy-consuming resistor temperature online monitoring method provided by the embodiment of the present application comprises the following steps.

[0066] 201. A thermal resistance and thermal capacity equivalent model of the energy-consuming resistor is constructed.

[0067] It should be noted that by simulating the energy consumption resistor, a thermal resistance curve of the temperature of the energy consumption resistor changing with time is obtained, and the curve is fitted to construct a thermal resistance and heat capacity equivalent model of the energy consumption resistor. The thermal resistance and heat capacity model adopts a first-order parameter, and its expression is:

[0068]

[0069] Wherein, R th is the thermal resistance curve, P th is the power applied to the energy consumption resistor, T Δ is the temperature rise of the energy consumption resistor, t is the time, R t is the equivalent thermal resistance, and C t is the equivalent heat capacity.

[0070] 202、According to the thermal resistance and heat capacity equivalent model, the equivalent heat capacity and equivalent thermal resistance of the energy consumption resistor are determined.

[0071] It should be noted that according to the expression of the thermal resistance and heat capacity model, after obtaining the simulated thermal resistance curve, the corresponding equivalent heat capacity and equivalent thermal resistance can be determined based on the thermal resistance curve.

[0072] 203、Obtain the measured power of the current period of the energy consumption resistor, the reference temperature of the last period and the preset period time.

[0073] It should be noted that for the energy consumption resistor used in the energy consumption circuit, the voltage across the energy consumption resistor is collected in real time, and the resistance value of the energy consumption resistor is obtained. The collected voltage and resistance value are input into the power calculation formula to obtain the measured power. The calculation formula is as follows:

[0074]

[0075] Wherein, P R is the energy power consumed by the resistor, U R is the collected voltage across the resistor, and R is the resistance value of the energy consumption resistor.

[0076] 204、The product of the equivalent thermal resistance of the energy consumption resistor and the period time is divided by the sum of the product of the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor and the period time, to obtain the first parameter.

[0077] It should be noted that the product of the equivalent thermal resistance of the energy consumption resistor and the period time is divided by the sum of the product of the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor and the period time, to obtain the first parameter. The expression of the first parameter is:

[0078]

[0079] Wherein, Ct R is the equivalent thermal resistance, T is the period time. t R is the equivalent thermal resistance, T is the period time.

[0080] 205、The first parameter is multiplied by the measured power, and then added to the reference temperature of the last period to obtain the actual temperature of the energy consumption resistor in the current period.

[0081] It should be noted that in the embodiment, the first parameter is multiplied by the measured power of the energy consumption resistor obtained in the current period to obtain a product, and the product is added to the first parameter to obtain the actual temperature in the current period.

[0082] In one example, the mapping relationship is:

[0083]

[0084] Wherein, u c (k) is the actual temperature of the energy consumption resistor calculated in the current period, u c (k-1) is the actual temperature of the energy consumption resistor calculated in the last period, P R (k) is the measured power calculated in the current period; T is the period time, k is the current period, and k-1 represents the last period.

[0085] As can be seen from the above, in the embodiment, the product of the equivalent thermal resistance of the energy consumption resistor and the period time is divided by the sum of the equivalent thermal capacity of the energy consumption resistor and the product of the equivalent thermal resistance and the period time, to obtain the first parameter, and the first parameter is multiplied by the measured power, and then added to the reference temperature of the last period to obtain the actual temperature of the energy consumption resistor in the current period, to realize the temperature monitoring of the energy consumption resistor in the current period.

[0086] 206、When the temperature of the energy consumption resistor is not less than the preset first temperature threshold, and the duration that the temperature of the energy consumption resistor is not less than the first temperature threshold is not less than the preset time threshold, stop feeding the energy consumption resistor, and issue an alarm.

[0087] 207、When the temperature of the energy consumption resistor is not greater than the preset second temperature threshold, and the duration that the temperature of the energy consumption resistor is not greater than the preset second temperature threshold is not less than the preset time threshold, feed the energy consumption resistor.

[0088] It should be noted that in the embodiment, the actual temperature of the energy consumption resistor in the current period is compared with the preset temperature threshold, the actual temperature in the current period is compared with the preset temperature threshold, the normal state or abnormal state of the energy consumption resistor is determined based on the comparison result, and an alarm prompt is issued when it is abnormal, and protection is performed according to a certain time delay, so that the temperature monitoring of the energy consumption resistor in the current period is realized. The temperature threshold includes the first temperature threshold and the second temperature threshold.

[0089] Assuming that the first temperature threshold is Tp and the second temperature threshold is Tf, there is:

[0090] When the temperature of the energy consumption resistor is ≥ Tp, and the duration of the temperature of the energy consumption resistor ≥ Tp is ≥ Td, it is considered that the energy consumption resistor is overloaded, the energy consumption circuit is stopped from being put into operation, and a warning signal is reported. When the calculated resistor temperature rise ≤ Tf and the duration is ≥ Td, it is determined that the energy consumption resistor recovers, the energy consumption resistor warning signal is reset, and the energy consumption circuit can be put into operation again.

[0091] As can be seen from the above, the embodiment converts the equivalent of the thermal circuit of the energy consumption resistor by obtaining the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor to be measured, determines the corresponding equivalent heat capacity and equivalent thermal resistance, and provides effective data support for monitoring the temperature of the energy consumption resistor. The measured power of the energy consumption resistor is obtained, the real-time collection of the power of the energy consumption resistor is realized, the reference temperature of the energy consumption resistor in the last period and the period time are obtained, and effective data support is provided for monitoring the temperature of the energy consumption resistor in the current period. According to the mapping relationship between the equivalent heat capacity, the equivalent thermal resistance, the period time, the measured power, the reference temperature of the energy consumption resistor, and the preset mapping relationship formula of the equivalent heat capacity, the equivalent thermal resistance, the period time, the measured power in the current period, the reference temperature in the last period, and the actual temperature of the energy consumption resistor in the current period, the temperature of the energy consumption resistor is calculated, so that the actual temperature value of the energy consumption resistor in the current period is quickly and accurately obtained. According to the comparison result of the actual temperature in the current period and the preset temperature threshold, the monitoring result of the energy consumption resistor in the current period is output, the temperature monitoring of the energy consumption resistor in the current period is realized, the problem of delayed measurement caused by sensor measurement in the existing energy consumption resistor temperature measurement is avoided, effective online monitoring of the temperature of the energy consumption resistor is realized, and effective technical support is provided for realizing the rapid over-temperature protection of the energy consumption resistor and improving the operation safety of the power equipment. The method is simple, easy to implement, and low in cost. Therefore, the present application solves the technical problem that the temperature of the energy consumption resistor cannot be effectively monitored in the prior art.

[0092] It should be understood that, although Figure 2 The steps in the flowchart of the method are displayed in sequence according to the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, Figure 2 At least part of the steps in the method can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or sub-steps or stages of other steps.

[0093] The above is an embodiment of the present invention providing an online temperature monitoring method for an energy-consuming resistor. The equivalent heat capacity and equivalent thermal resistance of the energy-consuming resistor in the present invention will be explained below with reference to specific simulation application examples.

[0094] In a simulation application example, such as Figure 4 As shown, Figure 4 The figure shows the temperature change curve of the energy-consuming resistor over time. Based on this curve, the equivalent thermal capacity of the energy-consuming resistor can be fitted to a value of 300F, and the equivalent thermal resistance can be fitted to a value of 0.1Ω.

[0095] Please see Figure 3 , Figure 3 An online temperature monitoring circuit for an energy-consuming resistor is provided, comprising: an energy-consuming circuit, an analog-to-digital conversion sampling circuit, a main control module, and a switch control module; the energy-consuming circuit includes an energy-consuming resistor and a controllable switching device connected in series with the energy-consuming resistor;

[0096] The input terminals of the analog-to-digital conversion sampling circuit are connected to both ends of the energy-consuming resistor to collect the voltage across the energy-consuming resistor.

[0097] The output of the main control module and the analog-to-digital conversion sampling circuit is used to receive the voltage across the energy-consuming resistor. Based on the voltage across the energy-consuming resistor and the pre-acquired resistance value of the energy-consuming resistor, the measured power of the energy-consuming resistor in the current cycle is calculated. The equivalent thermal capacity, equivalent thermal resistance, preset cycle time, and reference temperature of the energy-consuming resistor in the previous cycle are also acquired. Based on the equivalent thermal capacity, equivalent thermal resistance, cycle time, measured power, reference temperature, and preset mapping relationship, the actual temperature of the energy-consuming resistor in the current cycle is calculated. Based on the comparison between the actual temperature of the current cycle and the preset temperature threshold, the monitoring result of the energy-consuming resistor in the current cycle is output.

[0098] The switch control module is connected to the controllable switch device and the main control module respectively. It is used to disconnect the controllable switch device when it receives the cut-off command output by the main control module, and to turn on the controllable switch device when it receives the turn-on command output by the main control module.

[0099] The mapping formula contains the mapping relationship between the equivalent thermal capacity, equivalent thermal resistance, cycle time, measured power of the current cycle, reference temperature of the previous cycle, and actual temperature of the energy-consuming resistor in the current cycle.

[0100] It should be noted that, as Figure 3As shown, the energy consumption resistor is connected in series with the controllable switching device, which plays a role in consuming excess energy and avoiding overvoltage of the capacitor. The A / D sampling circuit (i.e. analog-to-digital conversion sampling circuit) is connected to both ends of the energy consumption resistor. The switch control module is connected to the control end of the controllable switching device. The main control module includes an operation unit, and an information storage unit and a fault analysis unit connected to the operation unit, respectively. The operation unit is connected to the switch control module and the A / D sampling circuit, respectively. The controllable switching device can be a semiconductor power switching device capable of responding to a control signal to turn on and turn off.

[0101] The workflow of the embodiment is as follows: in the current period, the A / D sampling circuit collects the voltage signal at both ends of the energy consumption resistor, wherein the collected voltage signal is an analog signal, the A / D sampling circuit converts the analog signal into a digital signal, and transmits the voltage of the digital signal type to the operation unit. The operation unit calculates the power of the energy consumption resistor as the measured power, combines the measured power, and calls the reference temperature of the last period, the equivalent heat capacity and equivalent thermal resistance of the energy consumption resistor, and the period time stored in the information storage unit, to calculate the actual temperature of the energy consumption resistor in the current period, and transmits the actual temperature to the information storage unit and the fault analysis unit. The fault analysis unit determines whether the energy consumption resistor is abnormal according to the actual temperature in the current period, and outputs the monitoring result. When it is determined that the energy consumption resistor is abnormal, a cut-off instruction is output to the switch control module, and the switch control module responds to the cut-off instruction to turn off the controllable switching device, thereby cutting off the energy consumption resistor. When it is determined that the energy consumption resistor is normal, a turn-on instruction is output to the switch control module, and the switch control module responds to the turn-on instruction to continuously turn on the controllable switching device, thereby realizing the input of the energy consumption resistor.

[0102] In one embodiment, the information storage unit and the fault analysis unit are connected to the upper layer controller, respectively.

[0103] It should be noted that in each period, the information storage unit and the fault analysis unit will upload the temperature information and determination results obtained in the current period to the upper layer controller through an optical fiber. The upper layer controller can issue corresponding protection instructions to the fault analysis unit according to the device running condition, the fault analysis unit transmits the protection instructions to the operation unit, so that the operation unit outputs corresponding instructions to the switch control module, thereby controlling the turn-on and turn-off of the controllable switching device, and further controlling the input or cut-off of the energy consumption resistor, realizing the temperature regulation of the energy consumption resistor, and achieving the effect of over-temperature protection.

[0104] In one embodiment, the controllable switching device can be an IGBT, an IGCT, or the like.

[0105] In one embodiment, the operation unit is an FPGA chip.

[0106] Please refer toFigure 5 The embodiment of the present application provides a kind of energy dissipation resistance temperature on-line monitoring device, comprising:

[0107] The acquisition module 301 is used to acquire the equivalent heat capacity of the energy dissipation resistance to be measured, the equivalent thermal resistance, and the measured power of the current period of the energy dissipation resistance, the reference temperature of the last period and the preset period time;

[0108] The calculation module 302 is used to calculate the actual temperature of the current period of the energy dissipation resistance according to the equivalent heat capacity of the energy dissipation resistance, the equivalent thermal resistance, the period time, the measured power, the reference temperature and the preset mapping relationship formula;The mapping relationship formula is embedded with the mapping relationship between the equivalent heat capacity of the energy dissipation resistance, the equivalent thermal resistance, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the current period of the energy dissipation resistance;

[0109] The monitoring module 303 is used to output the monitoring result of the current period of the energy dissipation resistance according to the comparison result of the actual temperature of the current period and the preset temperature threshold.

[0110] In one embodiment, the acquisition module 301 comprises:

[0111] The construction unit is used to construct the thermal resistance and heat capacity equivalent model of the energy dissipation resistance;

[0112] The determination unit is used to determine the equivalent heat capacity and the equivalent thermal resistance of the energy dissipation resistance according to the thermal resistance and heat capacity equivalent model.

[0113] In one embodiment, the calculation module 302 is used to divide the product of the equivalent thermal resistance of the energy dissipation resistance and the period time by the sum of the product of the equivalent heat capacity and the equivalent thermal resistance of the energy dissipation resistance and the period time, to obtain a first parameter;After multiplying the first parameter with the measured power, add the reference temperature of the last period to obtain the actual temperature of the current period of the energy dissipation resistance.

[0114] In one embodiment, the acquisition module 301 is also used to divide the product of the equivalent heat capacity and the equivalent thermal resistance of the energy dissipation resistance by the sum of the product of the equivalent heat capacity and the equivalent thermal resistance of the energy dissipation resistance and the period time, to obtain a second parameter;And used to multiply the second parameter with the actual temperature of the last period of the energy dissipation resistance to obtain the reference temperature of the last period of the energy dissipation resistance.

[0115] In one embodiment, the temperature threshold includes a first temperature threshold and a second temperature threshold, and the monitoring module 303 comprises:

[0116] The alarm module is used to determine that the energy dissipation resistance is abnormal when the temperature of the energy dissipation resistance is not less than the first temperature threshold, and the duration that the temperature of the energy dissipation resistance is not less than the first temperature threshold is not less than the preset time threshold, stop putting in the energy dissipation resistance, and issue an alarm;

[0117] The recovery module is configured to determine that the energy consumption resistor is normal and to put the energy consumption resistor into operation when the temperature of the energy consumption resistor is not greater than the second temperature threshold and the duration for which the temperature of the energy consumption resistor is not greater than the preset second temperature threshold is not less than the preset time threshold.

[0118] The embodiment of the present application further provides an electronic device, which comprises a processor and a memory:

[0119] The memory is configured to store program code and transmit the program code to the processor.

[0120] The processor is configured to execute the method according to any one of the above embodiments according to instructions in the program code.

[0121] The embodiment of the present application further provides a computer readable storage medium, which is configured to store program code, and the program code is configured to execute the method according to any one of the above embodiments.

[0122] As can be seen from the above, the energy consumption resistor temperature online monitoring method and related device provided by the present application can realize real-time calculation of the temperature of the current period of the energy consumption resistor by establishing a temperature monitoring model of the energy consumption resistor, taking the energy power consumed by the energy consumption resistor in the current period, the reference temperature in the last period, the period time, the equivalent heat capacity and the equivalent thermal resistance as inputs, and outputting the monitoring result of the current period of the energy consumption resistor according to the comparison result of the actual temperature of the current period and the preset temperature threshold, thereby realizing online monitoring of the temperature of the energy consumption resistor. The thermal resistance and heat capacity equivalent model parameters of the energy consumption resistor are fitted according to the simulated energy consumption resistor temperature-time curve, and the energy power consumed by the energy consumption resistor is calculated according to the real-time measurement of the voltage across the resistor. The energy consumption resistor temperature online monitoring method can quickly and accurately obtain the temperature value of the energy consumption resistor and obtain the running state of the energy consumption resistor, thereby avoiding the measurement delay problem caused by sensor measurement in the existing energy consumption resistor temperature monitoring method, realizing rapid protection of resistor over-temperature, and ensuring the safe operation of the power equipment device.

[0123] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the above-described device embodiments are merely schematic. For example, the division of the units is only a logical function division. There can be another division manner for the actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0124] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed to multiple network units. Part or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

[0125] In addition, each functional unit in various embodiments of the application can be integrated into one processing unit, or each functional unit can be a separate physical existence, or two or more functional units can be integrated into one processing unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0126] If the integrated unit is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the various embodiment methods of the application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0127] The terms "first", "second", "third", "fourth" and the like (if any) in the specification of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0128] It also needs to be explained that in the description of the present application, it needs to be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0129] The above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent substitutions for part of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for on-line monitoring of energy dissipation resistors, characterized in that, The method comprises the steps of: obtaining the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor to be measured, and obtaining the measured power of the current period of the energy consumption resistor, the reference temperature of the last period and the preset period time; calculating the actual temperature of the current period of the energy consumption resistor according to the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor, the period time, the measured power, the reference temperature and a preset mapping relationship; the mapping relationship has a mapping relationship between the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the current period of the energy consumption resistor; outputting the monitoring result of the current period of the energy consumption resistor according to the comparison result of the actual temperature of the current period and the preset temperature threshold.

2. The method of claim 1, wherein, The method comprises the steps of: constructing a thermal resistance and heat capacity equivalent model of the energy consumption resistor; determining the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor according to the thermal resistance and heat capacity equivalent model.

3. The method of claim 2, wherein, The method comprises the steps of: multiplying the equivalent thermal resistance of the energy consumption resistor by the period time, and dividing the product by the sum of the product of the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor and the period time to obtain a first parameter; multiplying the first parameter by the measured power, and adding the reference temperature of the last period to obtain the actual temperature of the current period of the energy consumption resistor.

4. The method of claim 3, wherein, The method comprises the steps of: multiplying the product of the equivalent heat capacity and the equivalent thermal resistance of the energy consumption resistor by the period time to obtain a second parameter; multiplying the second parameter by the actual temperature of the last period of the energy consumption resistor to obtain the reference temperature of the last period of the energy consumption resistor.

5. The method of claim 4, wherein, The temperature threshold comprises a first temperature threshold and a second temperature threshold, and the method comprises the steps of: when the temperature of the energy consumption resistor is not less than the first temperature threshold, and the duration that the temperature of the energy consumption resistor is not less than the first temperature threshold is not less than a preset time threshold, determining that the energy consumption resistor is abnormal, stopping the use of the energy consumption resistor and issuing an alarm; when the temperature of the energy consumption resistor is not greater than the second temperature threshold, and the duration that the temperature of the energy consumption resistor is not greater than the preset second temperature threshold is not less than a preset time threshold, determining that the energy consumption resistor is normal and using the energy consumption resistor.

6. An energy dissipating resistance temperature on-line monitoring circuit, characterized by, The method comprises the steps of: an energy consumption circuit, an analog-to-digital conversion sampling circuit, a main control module and a switch control module; the energy consumption circuit comprises an energy consumption resistor and a controllable switching device connected in series with the energy consumption resistor; the input end of the analog-to-digital conversion sampling circuit is connected with both ends of the energy consumption resistor, and is used for collecting the voltage between the two ends of the energy consumption resistor; The main control module is connected with the output end of the analog-digital conversion sampling circuit, used for receiving the voltage across the energy consumption resistor, and calculating the measured power of the current period of the energy consumption resistor according to the voltage across the energy consumption resistor and the pre-acquired resistance value of the energy consumption resistor, and acquiring the equivalent heat capacity, equivalent thermal resistance of the energy consumption resistor, preset period time and reference temperature of the last period of the energy consumption resistor, and calculating the actual temperature of the current period of the energy consumption resistor according to the equivalent heat capacity, equivalent thermal resistance of the energy consumption resistor, the period time, the measured power, the reference temperature and a preset mapping relationship, and outputting the monitoring result of the current period of the energy consumption resistor according to the comparison result of the actual temperature of the current period and a preset temperature threshold. The switch control module is connected with the controllable switching device and the main control module, used for disconnecting the controllable switching device when receiving the cut-off instruction output by the main control module, and used for turning on the controllable switching device when receiving the input instruction output by the main control module. The mapping relationship in the mapping relationship formula is embedded with the mapping relationship between the equivalent heat capacity, equivalent thermal resistance of the energy consumption resistor, the period time, the measured power of the current period, the reference temperature of the last period and the actual temperature of the current period of the energy consumption resistor.

7. An energy dissipating resistance temperature on-line monitoring device, characterized by, It comprises: An acquisition module is configured to acquire the equivalent heat capacity and equivalent thermal resistance of the energy consumption resistor to be measured, and acquire the measured power of the current period of the energy consumption resistor, the reference temperature of the last period and the preset period time. A calculation module is configured to calculate the actual temperature of the current period of the energy consumption resistor according to the equivalent heat capacity, equivalent thermal resistance of the energy consumption resistor, the period time, the measured power, the reference temperature and a preset mapping relationship. A monitoring module is configured to output the monitoring result of the current period of the energy consumption resistor according to the comparison result of the actual temperature of the current period and a preset temperature threshold.

8. The apparatus of claim 7, wherein, The acquisition module comprises: A construction unit is configured to construct a thermal resistance and heat capacity equivalent model of the energy consumption resistor. A determination unit is configured to determine the equivalent heat capacity and equivalent thermal resistance of the energy consumption resistor according to the thermal resistance and heat capacity equivalent model.

9. An electronic device, comprising: The device comprises a processor and a memory: The memory is configured to store program code and transmit the program code to the processor. The processor is configured to execute the method according to any one of claims 1-5 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium is configured to store program code, and the program code is configured to execute the method according to any one of claims 1-5.

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