CN110567739B - Method and device for rapid detection of heat dissipation state of radiator - Google Patents
Method and device for rapid detection of heat dissipation state of radiator Download PDFInfo
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Abstract
本发明公开了一种散热器散热状态快速检测方法及装置，该方法包括：首先建立散热器散热状态快速检测装置，通过软件方法，实现功率器件功率损耗的实时计算；其次通过变流装置散热器温升、散热器热阻与变流装置功率器件功率损耗三者的关系，利用实时计算所得的功率器件功率损耗，计算得到散热器的第一热阻；根据散热器第一热阻变化斜率快速判断热阻稳态值，然后根据热阻稳态值与散热器散热状态之间的对应关系，得到此时的变流装置散热器散热状态。本发明通过监测变流装置散热器的热阻变化斜率，来快速判断散热器的堵塞程度，是一种在线的智能快速检测方法，仅利用变流装置现有传感器，通过软件编程实现散热器堵塞程度的快速检测。
The invention discloses a method and a device for rapidly detecting the heat dissipation state of a radiator. The method comprises: firstly establishing a device for rapidly detecting the heat dissipation state of a radiator, realizing real-time calculation of the power loss of a power device through a software method; The relationship between the temperature rise, the thermal resistance of the radiator and the power loss of the power device of the converter device, the first thermal resistance of the radiator is calculated by using the power loss of the power device calculated in real time; according to the first thermal resistance of the radiator, the slope changes rapidly The steady state value of the thermal resistance is judged, and then the heat dissipation state of the radiator of the converter device at this time is obtained according to the corresponding relationship between the steady state value of the thermal resistance and the heat dissipation state of the heat sink. The invention can quickly judge the blockage degree of the radiator by monitoring the change slope of the thermal resistance of the radiator of the converter device, which is an online intelligent and rapid detection method. degree of rapid detection.
Description
技术领域technical field
本发明涉及轨道交通领域，尤其涉及一种变流装置的散热器散热状态快速检测方法及装置。The invention relates to the field of rail transportation, in particular to a method and device for rapidly detecting the heat dissipation state of a radiator of a converter device.
背景技术Background technique
变流装置是轨道交通车辆的核心装置，是轨道交通车辆牵引供电系统的重要组成部分，散热器作为变流装置散热的重要部件，对其散热状态进行评估是保证变流装置安全可靠运行的重要工作。The converter device is the core device of the rail transit vehicle and an important part of the traction power supply system of the rail transit vehicle. Work.
长期以来，对于散热器散热状态始终没有一种智能的快速检测方法，目前为了确保变流装置正常可靠工作，一般采用定期清理维护的方式，但定期监测具有盲目性，使得散热器清理维护存在欠维护、过维护的问题。为了解决这一问题，本发明提出了一种智能的散热器散热状态快速检测方法，仅利用变流装置现有的传感器，在不添加传感器、不改变变流装置结构的前提下，通过本发明提供的方法，可以实现散热器散热状态的快速检测。For a long time, there has not been an intelligent and rapid detection method for the heat dissipation state of the radiator. At present, in order to ensure the normal and reliable operation of the converter device, the method of regular cleaning and maintenance is generally adopted, but the regular monitoring is blind, which makes the cleaning and maintenance of the radiator insufficient. Maintenance and over-maintenance issues. In order to solve this problem, the present invention proposes an intelligent rapid detection method for the heat dissipation state of the radiator, which only uses the existing sensors of the converter, without adding sensors or changing the structure of the converter. The provided method can realize the rapid detection of the heat dissipation state of the radiator.
发明内容SUMMARY OF THE INVENTION
针对现有技术中存在的缺陷，本发明的目的在于提供一种散热器散热状态快速检测方法及装置，实现了散热器散热状态的快速检测与评估。In view of the defects existing in the prior art, the purpose of the present invention is to provide a method and device for rapid detection of the heat dissipation state of a radiator, so as to realize the rapid detection and evaluation of the heat dissipation state of the radiator.
为达到以上目的，本发明采取的技术方案是：In order to achieve the above purpose, the technical scheme adopted in the present invention is:
一种散热器散热状态快速检测方法，包括以下步骤：A method for quickly detecting the heat dissipation state of a radiator, comprising the following steps:
步骤1、获取所述散热器的温度、散热器入风口的温度；散热器的温度为第一温度，散热器入风口的温度为第二温度；
根据功率器件功率损耗相对于变流装置输入有功功率的占比计算功率器件功率损耗；Calculate the power loss of the power device according to the ratio of the power loss of the power device to the active power input by the converter;
步骤2、根据所述的第一温度、第二温度和所述功率器件功率损耗，确定第一热阻；
步骤3、根据第一热阻的暂态变化趋势得到热阻变化斜率，查找热阻变化斜率与热阻稳态值之间的对应关系，快速判断热阻稳态值；
步骤4、根据热阻稳态值，查找热阻稳态值与散热器散热状态之间的对应关系，快速判断散热器的散热状态，即散热器堵塞程度。
在上述方案的基础上，步骤1中，所述变流装置输入有功功率的计算公式如下式所示：On the basis of the above scheme, in
当变流装置为整流装置时，输入有功功率为：When the converter device is a rectifier device, the input active power is:
Po＝Udc·Idc (1)P o =U dc · I dc (1)
当变流装置为逆变装置时，输入有功功率为：When the converter device is an inverter device, the input active power is:
其中，P0为变流装置输入有功功率，Udc为变流装置直流侧电压，Idc为变流装置直流侧电流，Ua为变流装置交流侧A相相电压有效值，Ia为变流装置交流侧A相相电流有效值，
在上述方案的基础上，步骤1中，所述功率器件功率损耗计算公式：On the basis of the above scheme, in
Ploss＝P0·K (3)P loss =P 0 ·K (3)
其中，Ploss为功率器件功率损耗，K为功率器件功率损耗相对于变流装置输入侧有功功率的占比，根据变流装置的能效曲线得到。Among them, P loss is the power loss of the power device, and K is the ratio of the power loss of the power device to the active power at the input side of the converter device, which is obtained according to the energy efficiency curve of the converter device.
在上述方案的基础上，步骤2中，根据所述的第一温度、第二温度和所述功率器件功率损耗，确定第一热阻，具体为：On the basis of the above solution, in
将所述第一温度与第二温度的差值作为散热器的温升，即第三差值；将第三差值与功率器件功率损耗的比值确定为第一热阻R，计算公式如下：The difference between the first temperature and the second temperature is used as the temperature rise of the heat sink, that is, the third difference; the ratio between the third difference and the power loss of the power device is determined as the first thermal resistance R, and the calculation formula is as follows:
其中，T1为第一温度，T0为第二温度，△T为第三差值，Ploss为变流装置功率器件功率损耗。Wherein, T 1 is the first temperature, T 0 is the second temperature, ΔT is the third difference, and P loss is the power loss of the power device of the converter.
在上述方案的基础上，步骤3中，根据第一热阻的暂态变化趋势得到热阻变化斜率，热阻变化斜率计算公式如下：On the basis of the above scheme, in
其中，t1、t2分别为第一热阻变化过程中的两个相邻时刻，R11为t1时刻对应的热阻值，R21为t2时刻对应的热阻值，k为热阻变化斜率。Among them, t 1 and t 2 are two adjacent moments in the first thermal resistance change process, R 11 is the thermal resistance value corresponding to the time t 1 , R 21 is the thermal resistance value corresponding to the time t 2 , and k is the thermal resistance value. resistance change slope.
在上述方案的基础上，所述热阻变化斜率与热阻稳态值之间的对应关系、热阻稳态值与散热器散热状态之间的对应关系，通过实验数据获得。On the basis of the above solution, the corresponding relationship between the change slope of the thermal resistance and the steady-state value of the thermal resistance, and the corresponding relationship between the steady-state value of the thermal resistance and the heat dissipation state of the heat sink are obtained through experimental data.
本发明提供一种散热器散热状态快速检测装置，包括：获取模块、第一确定模块、第二确定模块、第三确定模块和第四确定模块；The invention provides a rapid detection device for the heat dissipation state of a radiator, comprising: an acquisition module, a first determination module, a second determination module, a third determination module and a fourth determination module;
所述获取模块包括温度传感器和电流传感器、电压传感器，用于获取散热器的温度、散热器入风口的温度、变流装置直流侧电流Idc、变流装置直流侧电压Udc、变流装置交流侧A相相电流有效值Ia、变流装置交流侧A相相电压有效值Ua；所述散热器的温度为第一温度，散热器入风口的温度为第二温度；The acquisition module includes a temperature sensor, a current sensor, and a voltage sensor, which are used to acquire the temperature of the radiator, the temperature of the air inlet of the radiator, the DC side current I dc of the converter device, the DC side voltage U dc of the converter device, and the converter device. The effective value I a of the A-phase phase current on the AC side, and the effective value U a of the A-phase phase voltage on the AC side of the converter device; the temperature of the radiator is the first temperature, and the temperature of the air inlet of the radiator is the second temperature;
所述第一确定模块与获取模块连接，用于通过获取模块获取的变流装置直流侧电流Idc、变流装置直流侧电压Udc、变流装置交流侧A相相电流有效值Ia、变流装置交流侧A相相电压有效值Ua，计算变流装置的输入有功功率；然后根据功率器件功率损耗相对于变流装置输入有功功率的占比计算功率器件功率损耗；The first determination module is connected to the acquisition module, and is used for acquiring the DC side current I dc of the converter device, the DC side voltage U dc of the converter device, the effective value I a of the A-phase current on the AC side of the converter device, Calculate the input active power of the converter device according to the effective value U a of the A-phase voltage on the AC side of the converter device; then calculate the power device power loss according to the ratio of the power loss of the power device to the input active power of the converter device;
所述第二确定模块与获取模块、第一确定模块连接，用于根据所述第一温度、第二温度和所述的变流装置功率器件功率损耗，确定第一热阻；The second determination module is connected with the acquisition module and the first determination module, and is configured to determine the first thermal resistance according to the first temperature, the second temperature and the power loss of the power device of the converter device;
所述第三确定模块与第二确定模块连接，用于根据第一热阻的暂态变化趋势得到热阻变化斜率，根据第一样本数据快速确定散热器热阻稳态值；所述第一样本数据是特定时间段内热阻变化斜率与热阻稳态值之间的对应关系样本数据；The third determination module is connected with the second determination module, and is used for obtaining the change slope of the thermal resistance according to the transient change trend of the first thermal resistance, and quickly determining the steady-state value of the heat sink thermal resistance according to the first sample data; A sample data is the sample data of the corresponding relationship between the slope of thermal resistance change and the steady-state value of thermal resistance in a specific time period;
所述第四确定模块与第三确定模块连接，用于根据第三确定模块得到的热阻稳态值，结合第二样本数据快速确定散热器的散热状态；所述第二样本数据是热阻稳态值与散热器散热状态之间的对应关系样本数据。The fourth determination module is connected to the third determination module, and is used to quickly determine the heat dissipation state of the heat sink according to the steady-state value of the thermal resistance obtained by the third determination module in combination with the second sample data; the second sample data is the thermal resistance Sample data for the correspondence between steady state values and heat sink cooling states.
在上述方案的基础上，所述第一确定模块具有相应的存储功能与计算功能，用于存储功率器件功率损耗计算程序。On the basis of the above solution, the first determination module has a corresponding storage function and calculation function for storing the power loss calculation program of the power device.
在上述方案的基础上，所述第三确定模块还用于，存储热阻变化斜率与热阻稳态值之间的对应关系。On the basis of the above solution, the third determination module is further configured to store the corresponding relationship between the thermal resistance change slope and the steady state value of the thermal resistance.
在上述方案的基础上，所述第四确定模块还用于，存储热阻稳态值与散热器散热状态之间的对应关系。Based on the above solution, the fourth determination module is further configured to store the correspondence between the steady state value of the thermal resistance and the heat dissipation state of the heat sink.
本发明所述的散热器散热状态快速检测方法，当需要确定散热器的堵塞程度时，根据散热器的第一温度、第二温度和变流装置功率器件功率损耗，确定第一热阻，在样本数据库根据热阻变化斜率与热阻稳态值之间的对应关系，确定散热器热阻稳态值，然后在样本数据库中根据热阻稳态值与散热状态之间的对应关系，确定散热器的散热状态，样本数据库中的样本数据可以真实的反映热阻稳态值与散热器散热状态之间的对应关系。因此，可以通过第一热阻的计算和实验数据库的支撑，得到散热器的散热状态。In the method for quickly detecting the heat dissipation state of the radiator according to the present invention, when the blockage degree of the radiator needs to be determined, the first thermal resistance is determined according to the first temperature, the second temperature of the radiator and the power loss of the power device of the converter device, and the The sample database determines the steady state value of the thermal resistance of the radiator according to the corresponding relationship between the change slope of the thermal resistance and the steady state value of the thermal resistance, and then determines the heat dissipation in the sample database according to the corresponding relationship between the steady state value of the thermal resistance and the heat dissipation state. The sample data in the sample database can truly reflect the corresponding relationship between the steady-state value of thermal resistance and the heat dissipation state of the radiator. Therefore, the heat dissipation state of the heat sink can be obtained through the calculation of the first thermal resistance and the support of the experimental database.
附图说明Description of drawings
本发明有如下附图：The present invention has the following accompanying drawings:
图1为本发明实施例提供的散热器的结构示意图。FIG. 1 is a schematic structural diagram of a heat sink provided by an embodiment of the present invention.
图2为本发明实施例提供的散热器散热状态快速检测方法示意图。FIG. 2 is a schematic diagram of a method for quickly detecting a heat dissipation state of a heat sink according to an embodiment of the present invention.
图3为本发明实施例提供的根据散热器热阻暂态过程中热阻变化斜率快速判断热阻稳态值示意图Ⅰ。FIG. 3 is a schematic diagram I of quickly judging a steady-state value of thermal resistance according to the change slope of thermal resistance of a heat sink in a transient process according to an embodiment of the present invention.
图4为本发明实施例提供的散热器工作过程中突然堵塞，根据散热器热阻暂态过程中热阻变化斜率快速判断热阻稳态值示意图Ⅱ。4 is a schematic diagram II of quickly judging the steady state value of the thermal resistance according to the change slope of the thermal resistance in the transient process of the thermal resistance of the radiator according to the embodiment of the present invention, which is suddenly blocked during the working process.
图5为本发明实施例提供的变流装置的散热器散热状态快速检测装置示意图。FIG. 5 is a schematic diagram of a rapid detection device for a heat dissipation state of a heat sink of a converter device according to an embodiment of the present invention.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图1～5，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying
图1为本发明提供的散热器的结构示意图，如图1所示，所述散热器包括散热基板1、散热翅片2、风冷通道3和风机4。FIG. 1 is a schematic structural diagram of a heat sink provided by the present invention. As shown in FIG. 1 , the heat sink includes a
变流装置产生的热量由散热基板1扩散到散热翅片2上，风机4产生强对流空气，使得散热翅片2上的热量通过风冷通道3扩散到空气中。The heat generated by the converter device is diffused by the heat
在实际中，变流装置中散热器的散热翅片2上容易黏附大量灰尘，导致散热器散热状态下降，影响变流装置进行热量扩散的效果，散热器散热状态下降的两种影响方式：一是大量灰尘粘附在散热器散热翅片2上，灰尘的导热系数比散热翅片2的导热系数低3个数量级，因此增加散热器的热阻，降低散热性能；二是入风口的局部堵塞会使得通风口有效通风面积变小，使得通过散热器风道的冷却剂的流量减小,使得散热状态变差。为了准确地确定散热器的散热状态，本发明提供了一种散热器散热状态快速检测方法，具体见图2所示。In practice, a large amount of dust is easily adhered to the
图2为本发明实施例提供的散热器散热状态快速检测方法示意图，如图2所示，包括：FIG. 2 is a schematic diagram of a method for quickly detecting a heat dissipation state of a radiator provided by an embodiment of the present invention. As shown in FIG. 2 , the method includes:
本发明实施例的执行可通过软件实现，也可以通过软件和硬件的结合实现，将散热器堵塞程度确定方法通过软件编程，通过软硬件结合的方法，实现散热器堵塞程度的智能监测。The implementation of the embodiments of the present invention can be implemented by software or by a combination of software and hardware. The method for determining the degree of blockage of the radiator is programmed through software, and the intelligent monitoring of the degree of blockage of the radiator is realized by the method of combining software and hardware.
当需要确定散热器堵塞程度时，可以执行图2所示的技术方案，或者，按照某预设的执行周期，周期性的执行图2所示的技术方案。When the degree of blockage of the radiator needs to be determined, the technical solution shown in FIG. 2 may be executed, or the technical solution shown in FIG. 2 may be periodically executed according to a preset execution period.
通过散热器本身的温度传感器，可以获取散热器的第一温度、第二温度。Through the temperature sensor of the radiator itself, the first temperature and the second temperature of the radiator can be obtained.
当变流装置为整流装置时，根据变流装置直流侧电压Udc，变流装置直流侧电流Idc，通过相应的功率损耗计算算法，计算功率器件功率损耗。When the converter device is a rectifier device, according to the DC side voltage U dc of the converter device and the DC side current I dc of the converter device, the power loss of the power device is calculated through a corresponding power loss calculation algorithm.
当变流装置为逆变装置时，根据变流装置交流侧A相相电压有效值Ua，变流装置交流侧A相相电流有效值Ia，通过相应的功率损耗计算算法，计算功率器件功率损耗。When the converter device is an inverter device, according to the rms value U a of the A-phase voltage on the AC side of the converter device, and the rms value of the A-phase current I a on the AC side of the converter device, the power device is calculated through the corresponding power loss calculation algorithm. Power loss.
根据第一温度、第二温度和变流装置功率器件功率损耗，确定散热器第一热阻。The first thermal resistance of the heat sink is determined according to the first temperature, the second temperature and the power loss of the power device of the converter device.
根据散热器第一热阻的暂态变化趋势得到第一热阻的斜率变化曲线，根据数据库中第一热阻的斜率与热阻稳态值之间的对应关系，快速判断散热器的热阻稳态值。According to the transient change trend of the first thermal resistance of the radiator, the slope change curve of the first thermal resistance is obtained. According to the corresponding relationship between the slope of the first thermal resistance and the steady-state value of the thermal resistance in the database, the thermal resistance of the radiator can be quickly judged steady state value.
根据判断得到的散热器热阻稳态值，根据数据库中热阻稳态值与散热器散热状态之间的对应关系，快速判断散热器的散热状态。According to the determined steady-state value of thermal resistance of the radiator, and according to the corresponding relationship between the steady-state value of thermal resistance in the database and the heat dissipation state of the heat sink, the heat dissipation state of the heat sink can be quickly judged.
例如：假设第一温度为T1，第二温度为T0，第三差值为△T，变流装置功率器件功率损耗为Ploss，第一热阻为R。则T1、T0、△T、Ploss与R之间存在如下对应关系：For example, assuming that the first temperature is T 1 , the second temperature is T 0 , the third difference is ΔT, the power loss of the power device of the converter device is P loss , and the first thermal resistance is R. Then there is the following correspondence between T 1 , T 0 , ΔT, P loss and R:
计算第一热阻变化过程中一段时间内的热阻变化斜率，快速判断热阻稳态值。Calculate the change slope of the thermal resistance within a period of time during the change of the first thermal resistance, and quickly determine the steady state value of the thermal resistance.
例如：t1、t2分别为第一热阻变化过程中的两个时刻，R11为t1时刻对应的热阻值，R21为t2时刻对应的热阻值，热阻斜率用k表示，其中k1,k2,…,kn对应不同的热阻变化斜率，对应关系如下：For example: t1 and t2 are two moments in the first thermal resistance change process, R11 is the thermal resistance value corresponding to the time t1, R21 is the thermal resistance value corresponding to the time t2, and the thermal resistance slope is represented by k, where k1, k2 ,…,kn correspond to different slopes of thermal resistance change, and the corresponding relationship is as follows:
然后根据热阻变化斜率快速判断热阻稳态值和散热器散热状态。Then, according to the change slope of the thermal resistance, the steady-state value of the thermal resistance and the heat dissipation state of the radiator can be quickly judged.
图3为本发明实施例提供的根据散热器热阻暂态过程中热阻变化斜率快速判断热阻稳态值示意图Ⅰ，如图3所示，热阻变化斜率、热阻稳态值与散热器散热状态之间的对应关系，通过实验获得。FIG. 3 is a schematic diagram I of quickly judging the steady state value of thermal resistance according to the change slope of thermal resistance in the transient process of the thermal resistance of the heat sink according to an embodiment of the present invention. As shown in FIG. The corresponding relationship between the heat dissipation states of the radiator is obtained through experiments.
例如：在100％散热状态下热阻稳态值为R2、热阻暂态变化斜率为k1；80％散热状态下，热阻稳态值为R3、热阻暂态变化斜率为k2；40％散热状态下热阻稳态值为R4、热阻暂态变化斜率为k3；10％散热状态下热阻稳态值为R5、热阻暂态变化斜率为k4。假如此时计算所得的热阻变化斜率为k2，则能快速预测热阻稳态值为R3，从而判断散热器此时的散热状态为80％。如果检测到的热阻变化斜率在k1和k2之间，则判断散热器此时的散热状态为80％-100％之间。For example: in 100% heat dissipation state, the steady state value of thermal resistance is R2, and the transient change slope of thermal resistance is k1; in 80% heat dissipation state, the steady state value of thermal resistance is R3, and the transient change slope of thermal resistance is k2; 40% In the heat dissipation state, the steady state value of thermal resistance is R4, and the transient change slope of thermal resistance is k3; under 10% heat dissipation state, the steady state value of thermal resistance is R5, and the transient change slope of thermal resistance is k4. If the calculated thermal resistance change slope is k2 at this time, the steady-state value of the thermal resistance can be quickly predicted as R3, and the heat dissipation state of the radiator at this time can be judged to be 80%. If the detected change slope of the thermal resistance is between k1 and k2, it is determined that the heat dissipation state of the heat sink at this time is between 80% and 100%.
图4为本发明实施例提供的散热器工作过程中突然堵塞，根据散热器热阻暂态过程中热阻变化斜率快速判断热阻稳态值示意图Ⅱ，如图4所示，散热器达到热阻稳态值后散热器堵塞，热阻变化斜率、热阻稳态值与散热器散热状态之间的对应关系，通过实验获得。Fig. 4 is a schematic diagram II of the radiator suddenly blocked during the working process of the radiator provided by the embodiment of the present invention, and the steady state value of the thermal resistance is quickly judged according to the change slope of the thermal resistance of the radiator in the transient process. As shown in Fig. 4, the radiator reaches the thermal resistance The radiator is blocked after the steady-state resistance value, and the corresponding relationship between the slope of thermal resistance change, the steady-state value of thermal resistance and the heat dissipation state of the radiator is obtained through experiments.
例如：在100％散热状态下热阻稳态值为R2、热阻暂态变化斜率为k1；突然堵塞导致散热器在80％散热状态下，热阻稳态值为R3、热阻暂态变化斜率为k5；突然堵塞导致散热器在40％散热状态下热阻稳态值为R4、热阻暂态变化斜率为k6；突然堵塞导致散热器在10％散热状态下热阻稳态值为R5、热阻暂态变化斜率为k7。假如热阻达到稳态值一段时间突然堵塞，此时计算所得的热阻变化斜率为k5，则能快速预测热阻稳态值为R3，从而判断散热器此时的散热状态为80％。如果检测到的热阻斜率在相邻两个斜率之间，则判断散热器此时在散热状态在两种相邻散热状态之间。散热状态的划分，根据工程实际需求，可按10％或20％间隔进行划分。For example: under 100% heat dissipation state, the steady state value of thermal resistance is R2, and the transient change slope of thermal resistance is k1; when the heat sink is suddenly blocked, the steady state value of thermal resistance is R3, and the transient change of thermal resistance is caused by 80% heat dissipation state. The slope is k5; the steady state value of thermal resistance of the radiator at 40% heat dissipation state caused by sudden blockage is R4, and the transient change slope of thermal resistance is k6; the steady state value of thermal resistance of the radiator at 10% heat dissipation state caused by sudden blockage is R5 , The thermal resistance transient change slope is k7. If the thermal resistance reaches the steady state value and suddenly blocks for a period of time, the calculated slope of the thermal resistance change is k5, and the steady state value of the thermal resistance can be quickly predicted as R3, thus judging that the heat dissipation state of the radiator is 80% at this time. If the detected slope of the thermal resistance is between two adjacent slopes, it is determined that the heat sink is in a heat dissipation state between two adjacent heat dissipation states at this time. The division of heat dissipation state can be divided into 10% or 20% intervals according to the actual needs of the project.
本发明提供的散热器散热状态快速检测方法，当需要快速确定散热器散热状态时，根据第一温度、第二温度和变流装置功率器件功率损耗，确定第一热阻，然后计算热阻变化斜率，在数据库查找热阻变化斜率与散热器热阻稳态值之间的对应关系，就可得到散热器的热阻稳态值，然后在数据库中查找热阻稳态之与散热器散热状态之间的对应关系，就可判断此时的散热器散热状态。In the method for quickly detecting the heat dissipation state of the radiator provided by the present invention, when the heat dissipation state of the heat sink needs to be quickly determined, the first thermal resistance is determined according to the first temperature, the second temperature and the power loss of the power device of the converter device, and then the change of the thermal resistance is calculated. Slope, find the corresponding relationship between the slope of the thermal resistance change and the steady-state value of the thermal resistance of the radiator in the database, you can get the steady-state value of the thermal resistance of the radiator, and then look up the steady state of the thermal resistance and the heat dissipation state of the radiator in the database The corresponding relationship between them can be used to judge the heat dissipation state of the radiator at this time.
在确定散热器散热性能退化程度的过程中，无需依靠人工观察来确定散热器的散热状态，仅利用变流装置现有的传感器，通过软硬件结合，程序编写，就可实现智能快速检测，这不仅节省了人工检测的成本，更提高了检测的效率与准确度。由于本发明中所示的散热器的散热状态确定方法，不再依赖人工观察，因此，本发明所示的散热器的散热状态确定方法可以适用于任何结构的散热器，使得本发明所示的散热器的散热性能确定方法具有通用性。In the process of determining the degree of degradation of the heat dissipation performance of the radiator, there is no need to rely on manual observation to determine the heat dissipation state of the radiator. Only using the existing sensors of the converter device, through the combination of software and hardware, and programming, intelligent and rapid detection can be realized. It not only saves the cost of manual detection, but also improves the efficiency and accuracy of detection. Since the method for determining the heat dissipation state of the radiator shown in the present invention no longer relies on manual observation, the method for determining the heat dissipation state of the radiator shown in the present invention can be applied to radiators of any structure, so that the The method for determining the heat dissipation performance of the heat sink is universal.
图5为本发明实施例提供的变流装置的散热器散热状态快速检测装置示意图。如图5所示，该装置可以包括获取模块、第一确定模块、第二确定模块、第三确定模块和第四确定模块，其中，FIG. 5 is a schematic diagram of a rapid detection device for a heat dissipation state of a heat sink of a converter device according to an embodiment of the present invention. As shown in FIG. 5 , the apparatus may include an acquisition module, a first determination module, a second determination module, a third determination module and a fourth determination module, wherein,
所述获取模块包括温度传感器和电流传感器、电压传感器，用于获取散热器的温度、散热器入风口的温度、变流装置直流侧电流Idc、变流装置直流侧电压Udc、变流装置交流侧A相相电流有效值Ia、变流装置交流侧A相相电压有效值Ua；所述散热器的温度为第一温度，散热器入风口的温度为第二温度；The acquisition module includes a temperature sensor, a current sensor, and a voltage sensor, which are used to acquire the temperature of the radiator, the temperature of the air inlet of the radiator, the DC side current I dc of the converter device, the DC side voltage U dc of the converter device, and the converter device. The effective value I a of the A-phase phase current on the AC side, and the effective value U a of the A-phase phase voltage on the AC side of the converter device; the temperature of the radiator is the first temperature, and the temperature of the air inlet of the radiator is the second temperature;
所述第一确定模块与获取模块连接，用于通过获取模块获取的变流装置直流侧电流Idc、变流装置直流侧电压Udc、变流装置交流侧A相相电流有效值Ia、变流装置交流侧A相相电压有效值Ua，计算变流装置的输入有功功率；然后根据功率器件功率损耗相对于变流装置输入有功功率的占比计算功率器件功率损耗；The first determination module is connected to the acquisition module, and is used for acquiring the DC side current I dc of the converter device, the DC side voltage U dc of the converter device, the effective value I a of the A-phase current on the AC side of the converter device, Calculate the input active power of the converter device according to the effective value U a of the A-phase voltage on the AC side of the converter device; then calculate the power device power loss according to the ratio of the power loss of the power device to the input active power of the converter device;
所述第二确定模块与获取模块、第一确定模块连接，用于根据所述第一温度、第二温度和所述的变流装置功率器件功率损耗，确定第一热阻；The second determination module is connected with the acquisition module and the first determination module, and is configured to determine the first thermal resistance according to the first temperature, the second temperature and the power loss of the power device of the converter device;
所述第三确定模块与第二确定模块连接，用于根据第一热阻的暂态变化趋势得到热阻变化斜率，根据第一样本数据快速确定散热器热阻稳态值；所述第一样本数据是特定时间段内热阻变化斜率与热阻稳态值之间的对应关系样本数据；The third determination module is connected with the second determination module, and is used for obtaining the change slope of the thermal resistance according to the transient change trend of the first thermal resistance, and quickly determining the steady-state value of the heat sink thermal resistance according to the first sample data; A sample data is the sample data of the corresponding relationship between the slope of thermal resistance change and the steady-state value of thermal resistance in a specific time period;
所述第四确定模块与第三确定模块连接，用于根据第三确定模块得到的热阻稳态值，结合第二样本数据快速确定此时散热器的散热状态；所述第二样本数据是热阻稳态值与散热器散热状态之间的对应关系样本数据。The fourth determination module is connected to the third determination module, and is used to quickly determine the heat dissipation state of the heat sink at this time according to the steady-state value of thermal resistance obtained by the third determination module in combination with the second sample data; the second sample data is: Sample data of the correspondence between the steady-state value of thermal resistance and the heat dissipation state of the heat sink.
本发明提供的变流装置的散热器散热状态快速检测装置可以执行上述方法实施例所示的技术方案，其实现原理以及有益效果类似，此处不再进行赘述。The device for quickly detecting the heat dissipation state of the radiator of the converter device provided by the present invention can implement the technical solutions shown in the above method embodiments, and the implementation principles and beneficial effects thereof are similar, which will not be repeated here.
最后应说明的是：以上各实施例仅用以说明本发明实施例的技术方案，而非对其限制；尽管参照前述各实施例对本发明实施例进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明实施例方案的范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, but not to limit them; although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those of ordinary It should be understood that: it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the embodiments of the present invention scope of the programme.
本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。Contents not described in detail in this specification belong to the prior art known to those skilled in the art.
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