A method for measuring the loss of magnetic components and related components

Abstract

This invention discloses a method and related components for measuring the loss of magnetic components, relating to the field of power electronics magnetic technology. The method includes controlling a heater to heat a magnetic component to a preset temperature; determining the temperature difference between the magnetic component and a heat spreader on its surface; controlling an excitation source to excite the magnetic component; controlling the power of the heater to decrease to maintain a constant temperature difference; and determining the power reduction of the heater, where the power reduction is equal to the power loss of the magnetic component. When the excitation source excites the magnetic component, the loss of the magnetic component is dissipated as heat. The increased temperature of the magnetic component increases the temperature difference between it and the heat spreader. By controlling the power of the heater to decrease, and under the condition of a constant temperature difference, the power reduction of the heater is equal to the power of the magnetic component. This allows for the determination of the power loss of the magnetic component without considering its electrical characteristics. Measuring the loss using the heat generated by the magnetic component yields more accurate results.

Description

Technical Field

[0001] This invention relates to the field of power electronics magnetic technology, and in particular to a method for measuring the loss of magnetic components and related components. Background Technology

[0002] Magnetic component losses include winding losses and core losses. Winding losses are linear and can be obtained using finite element simulation software. However, core losses are affected by numerous factors, and their accurate quantification has always been a challenge and a hot topic in the industry. The AC method has a large error in measuring the core loss of magnetic components with impedance angles close to 90°, and it is also difficult to accurately measure the core loss of integrated magnetic components with complex magnetic flux distributions. Therefore, the measurement of magnetic component losses is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to provide a method and related components for measuring the loss of magnetic components. This method does not require consideration of the electrical characteristics of the magnetic components and utilizes the heat generated by the magnetic components to measure their losses, resulting in more accurate results.

[0004] To solve the above-mentioned technical problems, the present invention provides a method for measuring the loss of magnetic components, comprising:

[0005] The heater controls the magnetic components to heat to a preset temperature;

[0006] Determine the temperature difference between the magnetic element and the heat exchange block disposed on the surface of the magnetic element;

[0007] The excitation source is controlled to excite the magnetic element;

[0008] The power of the heater is reduced to maintain the temperature difference constant;

[0009] The power reduction of the heater is determined to be equal to the power loss of the magnetic element.

[0010] On the other hand, determining the temperature difference between the magnetic element and the heat exchange block disposed on the surface of the magnetic element includes:

[0011] When the heater heats the magnetic element to a preset temperature, the temperature difference relationship is determined based on the heater's power and specific heat capacity coefficient. The temperature difference relationship is as follows: ;

[0012] When controlling the excitation source to excite the magnetic element, the temperature difference relationship is determined based on the power and specific heat capacity coefficient of the heater. The temperature difference relationship is as follows: ;

[0013] Wherein, P1 is the power of the heater during the process of heating the magnetic element to the preset temperature, k is the specific heat capacity coefficient, ΔT is the temperature difference, and P 磁元件 P1 represents the power loss of the magnetic element, and P2 represents the power of the heater after the power of the heater is reduced.

[0014] On the other hand, a heat sink is also provided on the side of the heat spreader away from the magnetic element, and the power reduction of the heater is determined by:

[0015] Construct an equivalent heat transfer model between the magnetic element, the heater, the heat exchange block, and the heat sink;

[0016] The power reduction of the heater is determined based on the equivalent heat transfer model.

[0017] On the other hand, constructing an equivalent heat transfer model between the magnetic element, the heater, the heat spreader, and the heat sink includes:

[0018] The heat generation power of the magnetic element is equivalent to a first power, and the power of the heater is equivalent to a second power;

[0019] The specific heat capacity of the magnetic element is equivalent to the first heat capacity, the specific heat capacity of the heater is equivalent to the second heat capacity, and the specific heat capacity of the heat spreader is equivalent to the third heat capacity.

[0020] The temperature of the magnetic element is equivalent to a first node, the temperature of the heater is equivalent to a second node, the temperature of the heat spreader is equivalent to a third node, and the temperature of the heat sink is equivalent to a fourth node.

[0021] The thermal resistance between the magnetic element and the heater is equivalent to the first thermal resistance, the thermal resistance between the heater and the heat spreader is equivalent to the second thermal resistance, and the thermal resistance between the heat sink and the heat spreader is equivalent to the third thermal resistance.

[0022] An equivalent heat transfer model is constructed between the magnetic element, the heater, the heat spreader and the heat sink based on the first power, the second power, the first heat capacity, the second heat capacity, the third heat capacity, the first node, the second node, the third node, the fourth node, the first thermal resistance, the second thermal resistance and the third thermal resistance.

[0023] On the other hand, the connection relationships of the equivalent heat transfer model include:

[0024] The first terminal of the first power supply is connected to the first terminal of the first heat capacitor and the first terminal of the first thermal resistor, and the common terminal of the connection is the first node. The second terminal of the first thermal resistor is connected to the first terminal of the second power supply, the first terminal of the second heat capacitor, and the first terminal of the second thermal resistor, and the common terminal of the connection is the second node. The second terminal of the second thermal resistor is connected to the first terminal of the third heat capacitor and the first terminal of the third thermal resistor, and the common terminal of the connection is the third node. The second terminal of the third thermal resistor is the fourth node. The common terminal of the first power supply, the first heat capacitor, the second power supply, the second heat capacitor, and the second terminal of the third heat capacitor is grounded.

[0025] On the other hand, determining the power reduction of the heater based on the equivalent heat transfer model includes:

[0026] Based on the first, second, and third nodes in the equivalent heat transfer model, a heat transfer relationship is constructed, which includes... , and ;

[0027] Where, q dut For the first power, q h For the second power, C dut For the first heat capacity, C h For the second heat capacity, C a For the third heat capacity, T dut For the first node, T h For the second node, T a For the third node, T s For the fourth node, R1 is the first thermal resistance, R2 is the second thermal resistance, and R3 is the third thermal resistance;

[0028] The heat transfer equation is obtained based on the heat transfer relationship, and the expression of the heat transfer equation is as follows: ;

[0029] The power reduction of the heater is determined based on the heat transfer equation.

[0030] On the other hand, it also includes:

[0031] Before the excitation source excites the magnetic element, a reference power is determined for the heater to heat the magnetic element to a preset temperature. The expression for the reference power is: ;

[0032] The expression for the steady-state power of the magnetic element after it has been excited by the control excitation source is determined, and the expression for the steady-state power is q = q base-q h ;

[0033] Based on the reference power and the steady-state power, the heat transfer equation is processed, and the expression of the processed heat transfer equation is as follows: ;

[0034] Where, q base Let q be the reference power, τ be the steady-state power, and τ be the time constant. , ;

[0035] Determining the power reduction of the heater based on the heat transfer equation includes:

[0036] The power reduction of the heater is determined based on the processed heat transfer equation.

[0037] On the other hand, determining the reduced power of the heater based on the processed heat transfer equation includes:

[0038] Determine the expression for the steady-state power, the expression for the steady-state power is: ;

[0039] Where q(t0) is the power value of the magnetic element at the initial moment;

[0040] The power reduction of the heater is determined based on the expression for the steady-state power and the expression for the processed heat transfer equation.

[0041] To address the aforementioned technical problems, the present invention also provides a measurement system for magnetic component losses, comprising:

[0042] The heating unit is used to control the heater to heat the magnetic components to a preset temperature.

[0043] A temperature difference determination unit is used to determine the temperature difference between the magnetic element and the heat exchange block disposed on the surface of the magnetic element.

[0044] An excitation unit is used to control the excitation source to excite the magnetic element;

[0045] A power control unit is used to control the power of the heater to decrease so that the temperature difference remains constant;

[0046] A power determination unit is used to determine the power reduction of the heater, wherein the power reduction of the heater is equal to the power loss of the magnetic element.

[0047] To address the aforementioned technical problems, the present invention also provides a device for measuring the loss of magnetic components, comprising:

[0048] Memory, used to store computer programs;

[0049] A processor is used to implement the steps of the above-described method for measuring the loss of magnetic components when executing the computer program.

[0050] To solve the above-mentioned technical problems, the present invention also provides a magnetic component loss measuring device, including the above-mentioned magnetic component loss measuring device, and further including a heater, a heat spreader and an excitation source;

[0051] The heater covers the surface of the magnetic element and is used to heat the magnetic element;

[0052] The heat spreader covers the surface of the heater to uniformly distribute the temperature of the magnetic element surface.

[0053] The excitation source is connected to the magnetic element and is used to apply excitation to the magnetic element.

[0054] On the other hand, it also includes an electrical control box, and the heater is a resistance wire;

[0055] The resistance wire is wound around the upper and lower surfaces of the magnetic element, and the heat dissipation block covers the resistance wire on the upper surface of the magnetic element and the resistance wire on the lower surface of the magnetic element, respectively.

[0056] The electrical control box is used to control the heating of the resistance wire.

[0057] On the other hand, it also includes heat sinks and temperature control devices;

[0058] The constant temperature device is connected to the heat sink, and the heat sink covers the heat spreader on the upper surface of the magnetic element and the heat spreader on the lower surface of the magnetic element respectively.

[0059] The temperature control device is used to provide a constant temperature for the heat sink, and the temperature of the heat sink is the same as the temperature of the heat exchange block.

[0060] On the other hand, it also includes insulated boxes;

[0061] The heater, the heat spreader, the magnetic element and the heat sink are all located inside the insulation box, while the magnetic element loss measuring device, the temperature control device and the electrical control box are all located outside the insulation box.

[0062] The surface of the insulated box is covered with insulation material to maintain a constant temperature inside the box.

[0063] To address the aforementioned technical problems, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described method for measuring the loss of magnetic components.

[0064] This invention discloses a method and related components for measuring the loss of magnetic components, relating to the field of power electronic magnetic technology. The method includes controlling a heater to heat a magnetic component to a preset temperature; determining the temperature difference between the magnetic component and a heat spreader on its surface; controlling an excitation source to excite the magnetic component; controlling the power of the heater to decrease to maintain a constant temperature difference; and determining the power reduction of the heater, where the power reduction is equal to the power loss of the magnetic component. When the excitation source excites the magnetic component, the loss of the magnetic component is dissipated as heat. The increased temperature of the magnetic component increases the temperature difference between it and the heat spreader. By controlling the power of the heater to decrease, under the condition of a constant temperature difference, the power reduction of the heater is equal to the power increase of the magnetic component. This allows for the determination of the power loss of the magnetic component without considering its electrical characteristics. Measuring from the perspective of constant heat yields more accurate results. Attached Figure Description

[0065] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0066] Figure 1 A flowchart of a method for measuring the loss of magnetic components provided by the present invention;

[0067] Figure 2 A schematic diagram of the structure of a magnetic component loss measuring device provided by the present invention;

[0068] Figure 3 This is a schematic diagram of the structure of an equivalent heat transfer model provided by the present invention;

[0069] Figure 4 A schematic diagram of the structure of a magnetic component loss measurement system provided by the present invention;

[0070] Figure 5 This is a schematic diagram of the structure of a magnetic component loss measuring device provided by the present invention. Detailed Implementation

[0071] The core of this invention is to provide a method and related components for measuring the loss of magnetic components. This method does not require consideration of the electrical characteristics of the magnetic components and utilizes the heat generated by the magnetic components to measure their losses, resulting in more accurate results.

[0072] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] Figure 1 This is a flowchart of a method for measuring the loss of magnetic components provided by the present invention. Figure 2 A schematic diagram of the structure of a magnetic component loss measuring device provided by the present invention;

[0074] The methods for measuring the loss of this magnetic component include:

[0075] S11: Controls the heater to heat the magnetic components to a preset temperature;

[0076] S12: Determine the temperature difference between the magnetic element and the heat exchange block placed on the surface of the magnetic element;

[0077] When the heater heats the magnetic element, the temperature of the magnetic element rises. A heat spreader is mounted on the surface of the magnetic element, and a heat sink is mounted on the surface of the heat spreader. The heat sink is connected to a temperature control device, and the heater is connected to an electrical control box. Because the temperature control device is connected to the heat sink, the temperature of the heat sink is constant. The function of the heat sink is to maintain a constant temperature for the heat spreader on the surface of the magnetic element. During the temperature rise of the magnetic element, a temperature difference will be generated between the magnetic element and the heat spreader.

[0078] It should be noted that the heating of the magnetic components by the heater is controlled by an electrical control box, and the heating power can be determined based on the electrical control box.

[0079] S13: Control the excitation source to excite the magnetic components;

[0080] When a high-frequency excitation source is used to excite a magnetic component, the magnetic component will experience losses, causing its temperature to rise. Since the temperature of the heat spreader is constant, this will lead to a larger temperature difference between the magnetic component and the heat spreader.

[0081] S14: Control the heater power to decrease in order to maintain a constant temperature difference;

[0082] S15: Determine the power reduction of the heater, which is equal to the power loss of the magnetic element.

[0083] The power of the heater is reduced using the electrical control box. When the reduction in power equals the loss of the magnetic component, the temperature difference between the magnetic component under test and the heat spreader remains constant. The reduction in the heater's power is the loss of the magnetic component under test. Throughout the experiment, the temperature difference between the magnetic component under test and the heat spreader is kept stable.

[0084] Please refer to Figure 2 The magnetic component under test is placed in a test chamber constructed of appropriately sized insulating material. Inside the chamber are a heat spreader and a heater. The heat spreader is kept at a constant temperature by a thermostat and its surface is covered with aluminum foil to uniformly heat the magnetic component and reduce errors caused by radiative heat transfer. The heater consists of resistance wire with a large surface area wound around the magnetic component. When the heater operates, it heats the magnetic component to the target temperature, creating a temperature difference between it and the heat spreader. Ideally, all the losses from the high-frequency excitation of the magnetic component under test are converted into heat, causing the surface temperature of the magnetic component to rise. Reducing the heater power keeps the temperature difference between the magnetic component and the heat spreader constant; the reduced heater power represents the power loss of the magnetic component.

[0085] The constant temperature device can be achieved by using a constant temperature water bath or a constant temperature oil bath.

[0086] This invention discloses a method for measuring the loss of magnetic components, relating to the field of power electronic magnetic technology. The method includes controlling a heater to heat a magnetic component to a preset temperature; determining the temperature difference between the magnetic component and a heat spreader on its surface; controlling an excitation source to excite the magnetic component; controlling the power of the heater to decrease to maintain a constant temperature difference; and determining the power reduction of the heater, where the power reduction is equal to the power loss of the magnetic component. When the excitation source excites the magnetic component, the loss of the magnetic component is dissipated as heat. The increased temperature of the magnetic component increases the temperature difference between it and the heat spreader. By controlling the power of the heater to decrease, under the condition of a constant temperature difference, the power reduction of the heater is equal to the power increase of the magnetic component. This allows for the determination of the power loss of the magnetic component without considering its electrical characteristics. Measuring from the perspective of constant heat yields more accurate results.

[0087] Based on the above embodiments:

[0088] In some embodiments, determining the temperature difference between a magnetic element and a heat spreader disposed on the surface of the magnetic element includes:

[0089] When controlling the heater to heat the magnetic element to a preset temperature, the temperature difference relationship is determined based on the heater's power and specific heat capacity coefficient. The temperature difference relationship is as follows: ;

[0090] When controlling the excitation source to excite the magnetic element, the temperature difference relationship is determined based on the heater's power and specific heat coefficient. The temperature difference relationship is as follows: ;

[0091] Where P1 is the power of the heater during the process of heating the magnetic element to the preset temperature, k is the specific heat capacity coefficient, ΔT is the temperature difference, and P 磁元件 P1 represents the power loss of the magnetic component, and P2 represents the power of the heater after the power of the heater is reduced.

[0092] In the first stage, only the heater heats the magnetic element. Therefore, under the action of the heater power P1, a temperature difference ΔT will be formed between the magnetic element under test and the heat exchange block, where k is a coefficient related to the mass and specific heat capacity of the object. P1 is the power generated by the heater, which is easy to obtain.

[0093] In the second stage, not only does the heater heat the magnetic element, but the magnetic element also experiences heat losses due to excitation. P2 is the power generated by the heater, which is readily available. Therefore, the power loss P of the magnetic element... 代测件 =P1-P2.

[0094] Figure 3 This is a schematic diagram of the structure of an equivalent heat transfer model provided by the present invention;

[0095] In some embodiments, a heat sink is further provided on the side of the heat spreader away from the magnetic element, and determining the reduced power of the heater includes:

[0096] Construct an equivalent heat transfer model between magnetic components, heaters, heat exchange blocks, and heat sinks;

[0097] The power reduction of the heater is determined based on the equivalent heat transfer model.

[0098] During the measurement process, due to the large heat capacity of the magnetic component under test, the measurement of the heat generated by the magnetic component due to heat loss exhibits a certain hysteresis effect. This effect prevents the measurement result from being directly equivalent to the transient heat generated by the magnetic component. Thermal balance analysis is the basis for calculating the accuracy of heat generation of the magnetic component under test. Under the premise of neglecting convective heat dissipation, an equivalent heat transfer model of the measuring device can be obtained based on heat transfer theory.

[0099] In some embodiments, an equivalent heat transfer model is constructed between the magnetic element, heater, heat spreader, and heat sink, including:

[0100] The heat generation power of the magnetic element is equivalent to the first power, and the power of the heater is equivalent to the second power;

[0101] The specific heat capacity of the magnetic element is equivalent to the first heat capacity, the specific heat capacity of the heater is equivalent to the second heat capacity, and the specific heat capacity of the heat spreader is equivalent to the third heat capacity.

[0102] The temperature of the magnetic element is equivalent to the first node, the temperature of the heater is equivalent to the second node, the temperature of the heat spreader is equivalent to the third node, and the temperature of the heat sink is equivalent to the fourth node.

[0103] The thermal resistance between the magnetic element and the heater is equivalent to the first thermal resistance, the thermal resistance between the heater and the heat spreader is equivalent to the second thermal resistance, and the thermal resistance between the heat sink and the heat spreader is equivalent to the third thermal resistance.

[0104] An equivalent heat transfer model is constructed between the magnetic element, heater, heat spreader and heat sink based on the first power, second power, first heat capacity, second heat capacity, third heat capacity, first node, second node, third node, fourth node, first thermal resistance, second thermal resistance and third thermal resistance.

[0105] In some embodiments, the connection relationships of the equivalent heat transfer model include:

[0106] The first terminal of the first power is connected to the first terminal of the first heat capacitor and the first terminal of the first thermal resistor, and the common terminal of the connection is the first node. The second terminal of the first thermal resistor is connected to the first terminal of the second power, the first terminal of the second heat capacitor and the first terminal of the second thermal resistor, and the common terminal of the connection is the second node. The second terminal of the second thermal resistor is connected to the first terminal of the third heat capacitor and the first terminal of the third thermal resistor, and the common terminal of the connection is the third node. The second terminal of the third thermal resistor is the fourth node. The second terminal of the first power, the second terminal of the first heat capacitor, the second terminal of the second power, the second terminal of the second heat capacitor and the second terminal of the third heat capacitor are connected and the common terminal of the connection is grounded.

[0107] In some embodiments, determining the power reduction of the heater based on an equivalent heat transfer model includes:

[0108] The heat transfer relationship is constructed based on the first, second, and third nodes in the equivalent heat transfer model. The heat transfer relationship includes... , and ;

[0109] Where, q dut The first power (power of the magnetic component under test), q h For the second power (the power applied by the heater), C dut For the first heat capacity (heat capacity of the magnetic element under test), C h For the second heat capacity (heater heat capacity), C a The third heat capacity (heat capacity of the heat exchanger), T dut As the first node, T h For the second node, T a As the third node, T sFor the fourth node, R1 is the first thermal resistance (the thermal resistance between the magnetic component under test and the heater), R2 is the second thermal resistance (the thermal resistance between the heater and the heat spreader), and R3 is the third thermal resistance (the thermal resistance between the heat sink and the heat spreader).

[0110] The heat transfer equation is derived from the heat transfer relations. The expression for the heat transfer equation is: ;

[0111] The power reduction of the heater is determined based on the heat transfer equation.

[0112] According to Kirchhoff's laws and thermoelectric analogy, in T dut T h and T a At the nodes, heat transfer equations can be established. According to the principle of isothermal calorimetry, T... a and T s If kept constant, its derivative is zero, and the heat transfer equation can be obtained from the heat transfer relations.

[0113] In some embodiments, it also includes:

[0114] Before the excitation source excites the magnetic element, a reference power is determined for the heater to heat the magnetic element to a preset temperature. The expression for the reference power is: ;

[0115] Determine the expression for the steady-state power of the magnetic element after it has been excited by the control excitation source. The expression for the steady-state power is q = q base -q h ;

[0116] Based on the reference power and steady-state power, the heat transfer equation is processed, and the expression of the processed heat transfer equation is as follows: ;

[0117] Where, q base Let q be the reference power, τ be the steady-state power, and τ be the time constant. , ;

[0118] The power reduction of the heater is determined based on the heat transfer equation, including:

[0119] The power reduction of the heater is determined based on the processed heat transfer equation.

[0120] When the magnetic component is not subjected to high-frequency excitation, the power of the heater when heating the magnetic component to the target temperature is the reference power q. base time constant It is the key factor affecting the dynamic performance of the calorimeter.

[0121] Therefore, the heat transfer equation can be rewritten as And since q=qbase -q h Therefore, the heat transfer equation is further rewritten as follows: ,because Therefore, after processing the heat transfer equation, we finally obtain .

[0122] In some embodiments, determining the reduced power of the heater based on the processed heat transfer equation includes:

[0123] Determine the expression for steady-state power. The expression for steady-state power is: ;

[0124] Where q(t0) is the power value of the magnetic element at the initial moment;

[0125] The power reduction of the heater is determined based on the expression for steady-state power and the expression for the processed heat transfer equation.

[0126] Regarding the first-order dynamic response expression of q, when the magnetic component under test does not generate heat, one solution can be obtained as q=0, then q can be expressed as: Logarithmic operations yield the following results. The time constant τ in the equation can be obtained through linear fitting. Then, the time constant and the filtered dq / dt are substituted into... The heat generation power of the device under test can be obtained.

[0127] Figure 4 This is a schematic diagram of a magnetic component loss measurement system provided by the present invention. The magnetic component loss measurement system includes:

[0128] Heating unit 41 is used to control the heater to heat the magnetic element to a preset temperature;

[0129] Temperature difference determination unit 42 is used to determine the temperature difference between the magnetic element and the heat exchange block disposed on the surface of the magnetic element;

[0130] Excitation unit 43 is used to control the excitation source to excite the magnetic element;

[0131] The power control unit 44 is used to control the power of the heater to decrease so that the temperature difference remains constant;

[0132] The power determination unit 45 is used to determine the power reduction of the heater, which is equal to the power loss of the magnetic element.

[0133] The description of the magnetic component loss measurement system provided in this application is given in the above embodiments and will not be repeated here.

[0134] Based on the above embodiments:

[0135] The temperature difference determination unit 42 is specifically used to determine the temperature difference relationship based on the heater's power and specific heat capacity coefficient when controlling the heater to heat the magnetic element to a preset temperature. The temperature difference relationship is as follows: ;

[0136] When controlling the excitation source to excite the magnetic element, the temperature difference relationship is determined based on the heater's power and specific heat coefficient. The temperature difference relationship is as follows: ;

[0137] Where P1 is the power of the heater during the process of heating the magnetic element to the preset temperature, k is the specific heat capacity coefficient, ΔT is the temperature difference, and P 磁元件 P1 represents the power loss of the magnetic component, and P2 represents the power of the heater after the power of the heater is reduced.

[0138] A heat sink is also provided on the side of the heat spreader away from the magnetic element;

[0139] The equivalent heat transfer model building unit is used to build an equivalent heat transfer model between magnetic components, heaters, heat exchange blocks and heat sinks.

[0140] The power determination unit 45 is specifically used to determine the reduced power of the heater based on the equivalent heat transfer model.

[0141] The equivalent heat transfer model construction unit is specifically used to convert the heat generation power of the magnetic element into a first power and the power of the heater into a second power.

[0142] The specific heat capacity of the magnetic element is equivalent to the first heat capacity, the specific heat capacity of the heater is equivalent to the second heat capacity, and the specific heat capacity of the heat spreader is equivalent to the third heat capacity.

[0143] The temperature of the magnetic element is equivalent to the first node, the temperature of the heater is equivalent to the second node, the temperature of the heat spreader is equivalent to the third node, and the temperature of the heat sink is equivalent to the fourth node.

[0144] The thermal resistance between the magnetic element and the heater is equivalent to the first thermal resistance, the thermal resistance between the heater and the heat spreader is equivalent to the second thermal resistance, and the thermal resistance between the heat sink and the heat spreader is equivalent to the third thermal resistance.

[0145] An equivalent heat transfer model is constructed between the magnetic element, heater, heat spreader and heat sink based on the first power, second power, first heat capacity, second heat capacity, third heat capacity, first node, second node, third node, fourth node, first thermal resistance, second thermal resistance and third thermal resistance.

[0146] The connection relationships in the equivalent heat transfer model include:

[0147] The first terminal of the first power is connected to the first terminal of the first heat capacitor and the first terminal of the first thermal resistor, and the common terminal of the connection is the first node. The second terminal of the first thermal resistor is connected to the first terminal of the second power, the first terminal of the second heat capacitor and the first terminal of the second thermal resistor, and the common terminal of the connection is the second node. The second terminal of the second thermal resistor is connected to the first terminal of the third heat capacitor and the first terminal of the third thermal resistor, and the common terminal of the connection is the third node. The second terminal of the third thermal resistor is the fourth node. The second terminal of the first power, the second terminal of the first heat capacitor, the second terminal of the second power, the second terminal of the second heat capacitor and the second terminal of the third heat capacitor are connected and the common terminal of the connection is grounded.

[0148] The heat transfer relationship determination unit is used to construct heat transfer relationships based on the first, second, and third nodes in the equivalent heat transfer model. The heat transfer relationships include... , and ;

[0149] Where, q dut The first power (power of the magnetic component under test), q h For the second power (the power applied by the heater), C dut For the first heat capacity (heat capacity of the magnetic element under test), C h For the second heat capacity (heater heat capacity), C a The third heat capacity (heat capacity of the heat exchanger), T dut As the first node, T h For the second node, T a As the third node, T s For the fourth node, R1 is the first thermal resistance (the thermal resistance between the magnetic component under test and the heater), R2 is the second thermal resistance (the thermal resistance between the heater and the heat spreader), and R3 is the third thermal resistance (the thermal resistance between the heat sink and the heat spreader).

[0150] The heat transfer equation determination unit is used to derive the heat transfer equation from the heat transfer relations. The expression of the heat transfer equation is as follows: ;

[0151] The power determination unit 45 is specifically used to determine the power reduction of the heater based on the heat transfer equation.

[0152] The reference power determination unit is used to determine the reference power required for the heater to heat the magnetic element to a preset temperature before the excitation source excites the magnetic element. The expression for the reference power is as follows: ;

[0153] The steady-state power determination unit is used to determine the expression for the steady-state power of the magnetic element after the excitation source excites the magnetic element. The expression for the steady-state power is q = q base -q h ;

[0154] Based on the reference power and steady-state power, the heat transfer equation is processed, and the expression of the processed heat transfer equation is as follows: ;

[0155] Where, q base Let q be the reference power, τ be the steady-state power, and τ be the time constant. , ;

[0156] The power determination unit 45 is specifically used to determine the reduced power of the heater based on the processed heat transfer equation.

[0157] The steady-state power expression determination unit is used to determine the expression for steady-state power, which is as follows: ;

[0158] Where q(t0) is the power value of the magnetic element at the initial moment;

[0159] The power determination unit 45 is specifically used to determine the power reduction of the heater based on the expression of steady-state power and the expression of the processed heat transfer equation.

[0160] Figure 5 This is a schematic diagram of a magnetic component loss measuring device provided by the present invention. The magnetic component loss measuring device includes:

[0161] Memory 51 is used to store computer programs;

[0162] The processor 52 is used to execute a computer program to implement the steps of the above-described method for measuring the loss of magnetic components.

[0163] The description of the magnetic component loss measuring device provided in this application is given in the above embodiments and will not be repeated here.

[0164] Figure 2 This is a schematic diagram of the structure of a magnetic component loss measuring device provided by the present invention. The magnetic component loss measuring device includes the above-mentioned magnetic component loss measuring apparatus, and also includes a heater 1, a heat spreader 2 and an excitation source 3.

[0165] Heater 1 covers the surface of the magnetic element and is used to heat the magnetic element;

[0166] The heat spreader 2 covers the surface of the heater 1 to uniformly heat the surface of the magnetic element;

[0167] Excitation source 3 is connected to the magnetic element and is used to apply excitation to the magnetic element.

[0168] In some embodiments, the device also includes an electrical control box 4, and the heater 1 is a resistance wire;

[0169] Resistance wires are wound around the upper and lower surfaces of the magnetic element, and heat spreader 2 covers the resistance wires on the upper surface and the lower surface of the magnetic element, respectively.

[0170] The electrical control box 4 is used to control the heating of the resistance wire.

[0171] In some embodiments, a heat sink 5 and a temperature control device 6 are also included;

[0172] The constant temperature device 6 is connected to the heat sink 5, and the heat sink 5 covers the heat spreader 2 on the upper surface of the magnetic element and the heat spreader 2 on the lower surface of the magnetic element respectively.

[0173] The temperature control device 6 is used to provide a constant temperature for the heat sink 5, and the temperature of the heat sink 5 is the same as the temperature of the heat spreader 2.

[0174] In some embodiments, an insulated box 7 is also included;

[0175] Heater 1, heat spreader 2, magnetic element and heat sink 5 are all installed inside the heat preservation box 7, while the magnetic element loss measuring device, constant temperature device 6 and electrical control box 4 are all installed outside the heat preservation box 7.

[0176] The surface of the insulated box 7 is covered with insulation material to maintain a constant temperature inside the insulated box 7.

[0177] The magnetic component under test is placed in an insulated box 7 constructed of appropriately sized insulating material. Inside the box 7 are a heat spreader 2 and a heater 1. The heat spreader 2 is kept at a constant temperature by a thermostat 6 via an oil bath or water bath, and its surface is covered with aluminum foil to uniformly heat the magnetic component and reduce errors caused by radiative heat transfer. The heater 1 consists of resistance wire with a large surface area wound around the magnetic component. When the heater 1 operates, it heats the magnetic component to the target temperature, creating a temperature difference with the heat spreader 2. Ideally, all losses from the high-frequency excitation of the magnetic component are converted into heat, causing the surface temperature of the magnetic component to rise. Reducing the power of the heater 1 keeps the temperature difference between the test component and the heat spreader constant; the reduced power of the heater 1 represents the power loss of the magnetic component.

[0178] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described method for measuring the loss of magnetic components.

[0179] The description of the computer-readable storage medium provided in this application is given in the above embodiments and will not be repeated here.

[0180] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0181] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0182] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for measuring the loss of a magnetic component, characterized in that, include: The heater controls the magnetic components to heat to a preset temperature; Determine the temperature difference between the magnetic element and the heat exchange block disposed on the surface of the magnetic element; The excitation source is controlled to excite the magnetic element; The power of the heater is reduced to maintain the temperature difference constant; The power reduction of the heater is determined to be equal to the power loss of the magnetic element; A heat sink is also provided on the side of the heat spreader away from the magnetic element. Determining the reduction in power of the heater includes: Construct an equivalent heat transfer model between the magnetic element, the heater, the heat exchange block, and the heat sink; The power reduction of the heater is determined based on the equivalent heat transfer model. Constructing an equivalent heat transfer model between the magnetic element, the heater, the heat exchanger, and the heat sink includes: The heat generation power of the magnetic element is equivalent to a first power, and the power of the heater is equivalent to a second power; The specific heat capacity of the magnetic element is equivalent to the first heat capacity, the specific heat capacity of the heater is equivalent to the second heat capacity, and the specific heat capacity of the heat spreader is equivalent to the third heat capacity. The temperature of the magnetic element is equivalent to a first node, the temperature of the heater is equivalent to a second node, the temperature of the heat spreader is equivalent to a third node, and the temperature of the heat sink is equivalent to a fourth node. The thermal resistance between the magnetic element and the heater is equivalent to the first thermal resistance, the thermal resistance between the heater and the heat spreader is equivalent to the second thermal resistance, and the thermal resistance between the heat sink and the heat spreader is equivalent to the third thermal resistance. An equivalent heat transfer model is constructed between the magnetic element, the heater, the heat spreader and the heat sink based on the first power, the second power, the first heat capacity, the second heat capacity, the third heat capacity, the first node, the second node, the third node, the fourth node, the first thermal resistance, the second thermal resistance and the third thermal resistance. Determining the power reduction of the heater based on the equivalent heat transfer model includes: Based on the first, second, and third nodes in the equivalent heat transfer model, a heat transfer relationship is constructed, which includes... , and ; Where, q dut For the first power, q h For the second power, C dut For the first heat capacity, C h For the second heat capacity, C a For the third heat capacity, T dut For the first node, T h For the second node, T a For the third node, T s For the fourth node, R1 is the first thermal resistance, R2 is the second thermal resistance, and R3 is the third thermal resistance; The heat transfer equation is obtained based on the heat transfer relationship, and the expression of the heat transfer equation is as follows: ; The power reduction of the heater is determined based on the heat transfer equation.

2. The method for measuring the loss of magnetic components as described in claim 1, characterized in that, Determining the temperature difference between the magnetic element and the heat exchange block disposed on the surface of the magnetic element includes: When the heater heats the magnetic element to a preset temperature, the temperature difference relationship is determined based on the heater's power and specific heat capacity coefficient. The temperature difference relationship is as follows: ; When controlling the excitation source to excite the magnetic element, the temperature difference relationship is determined based on the power and specific heat capacity coefficient of the heater. The temperature difference relationship is as follows: ; Wherein, P1 is the power of the heater during the process of heating the magnetic element to the preset temperature, k is the specific heat capacity coefficient, ΔT is the temperature difference, and P 磁元件 P1 represents the power loss of the magnetic element, and P2 represents the power of the heater after the power of the heater is reduced.

3. The method for measuring the loss of magnetic components as described in claim 1, characterized in that, The connection relationships of the equivalent heat transfer model include: The first terminal of the first power supply is connected to the first terminal of the first heat capacitor and the first terminal of the first thermal resistor, and the common terminal of the connection is the first node. The second terminal of the first thermal resistor is connected to the first terminal of the second power supply, the first terminal of the second heat capacitor, and the first terminal of the second thermal resistor, and the common terminal of the connection is the second node. The second terminal of the second thermal resistor is connected to the first terminal of the third heat capacitor and the first terminal of the third thermal resistor, and the common terminal of the connection is the third node. The second terminal of the third thermal resistor is the fourth node. The common terminal of the first power supply, the first heat capacitor, the second power supply, the second heat capacitor, and the second terminal of the third heat capacitor is grounded.

4. The method for measuring the loss of magnetic components as described in claim 1, characterized in that, Also includes: Before the excitation source excites the magnetic element, a reference power is determined for the heater to heat the magnetic element to a preset temperature. The expression for the reference power is: ; The expression for the steady-state power of the magnetic element after it has been excited by the control excitation source is determined, and the expression for the steady-state power is q = q base -q h ; Based on the reference power and the steady-state power, the heat transfer equation is processed, and the expression of the processed heat transfer equation is as follows: ; Where, q base Let q be the reference power, τ be the steady-state power, and τ be the time constant. , ; Determining the power reduction of the heater based on the heat transfer equation includes: The power reduction of the heater is determined based on the processed heat transfer equation.

5. The method for measuring the loss of magnetic components as described in claim 4, characterized in that, Determining the reduced power of the heater based on the processed heat transfer equation includes: Determine the expression for the steady-state power, the expression for the steady-state power is: ; Where q(t0) is the power value of the magnetic element at the initial time, and t0 is the initial time; The power reduction of the heater is determined based on the expression for the steady-state power and the expression for the processed heat transfer equation.

6. A system for measuring the loss of a magnetic component, characterized in that, include: The heating unit is used to control the heater to heat the magnetic components to a preset temperature. A temperature difference determination unit is used to determine the temperature difference between the magnetic element and the heat exchange block disposed on the surface of the magnetic element. An excitation unit is used to control the excitation source to excite the magnetic element; A power control unit is used to control the power of the heater to decrease so that the temperature difference remains constant; A power determination unit is used to determine the power reduction of the heater, wherein the power reduction of the heater is equal to the power loss of the magnetic element; A heat sink is also provided on the side of the heat spreader away from the magnetic element; Also includes: An equivalent heat transfer model construction unit is used to construct an equivalent heat transfer model between the magnetic element, the heater, the heat exchange block and the heat sink. The power determination unit is specifically used to determine the reduced power of the heater based on the equivalent heat transfer model; The equivalent heat transfer model construction unit is specifically used to convert the heat generation power of the magnetic element into a first power and the power of the heater into a second power. The specific heat capacity of the magnetic element is equivalent to the first heat capacity, the specific heat capacity of the heater is equivalent to the second heat capacity, and the specific heat capacity of the heat spreader is equivalent to the third heat capacity. The temperature of the magnetic element is equivalent to a first node, the temperature of the heater is equivalent to a second node, the temperature of the heat spreader is equivalent to a third node, and the temperature of the heat sink is equivalent to a fourth node. The thermal resistance between the magnetic element and the heater is equivalent to the first thermal resistance, the thermal resistance between the heater and the heat spreader is equivalent to the second thermal resistance, and the thermal resistance between the heat sink and the heat spreader is equivalent to the third thermal resistance. An equivalent heat transfer model is constructed between the magnetic element, the heater, the heat spreader and the heat sink based on the first power, the second power, the first heat capacity, the second heat capacity, the third heat capacity, the first node, the second node, the third node, the fourth node, the first thermal resistance, the second thermal resistance and the third thermal resistance. A heat transfer relationship determination unit is used to construct heat transfer relationships based on the first node, second node, and third node in the equivalent heat transfer model. The heat transfer relationships include... , and ; Where, q dut For the first power, q h For the second power, C dut For the first heat capacity, C h For the second heat capacity, C a For the third heat capacity, T dut For the first node, T h For the second node, T a For the third node, T s For the fourth node, R1 is the first thermal resistance, R2 is the second thermal resistance, and R3 is the third thermal resistance; The heat transfer equation determination unit is used to derive the heat transfer equation based on the heat transfer relationship, wherein the expression of the heat transfer equation is: ; The power reduction of the heater is determined based on the heat transfer equation.

7. A device for measuring the loss of a magnetic component, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the steps of the method for measuring the loss of magnetic components as described in any one of claims 1 to 5.

8. A measuring device for magnetic component loss, characterized in that, The device for measuring magnetic component loss as described in claim 7 further includes a heater, a heat spreader, and an excitation source. The heater covers the surface of the magnetic element and is used to heat the magnetic element; The heat spreader covers the surface of the heater to uniformly distribute the temperature of the magnetic element surface. The excitation source is connected to the magnetic element and is used to apply excitation to the magnetic element.

9. The measuring device for magnetic component loss as described in claim 8, characterized in that, It also includes an electrical control box, and the heater is a resistance wire; The resistance wire is wound around the upper and lower surfaces of the magnetic element, and the heat spreader blocks cover the resistance wire on the upper surface and the resistance wire on the lower surface of the magnetic element, respectively. The electrical control box is used to control the heating of the resistance wire.

10. The measuring device for magnetic component loss as described in claim 9, characterized in that, It also includes heat sinks and temperature control devices; The constant temperature device is connected to the heat sink, and the heat sink covers the heat spreader on the upper surface of the magnetic element and the heat spreader on the lower surface of the magnetic element respectively. The temperature control device is used to provide a constant temperature for the heat sink, and the temperature of the heat sink is the same as the temperature of the heat exchange block.

11. The measuring device for magnetic component loss as described in any one of claims 8 to 10, characterized in that, It also includes insulated boxes; The heater, the heat spreader, the magnetic element and the heat sink are all located inside the insulation box, while the magnetic element loss measuring device, the temperature control device and the electrical control box are all located outside the insulation box. The surface of the insulated box is covered with insulation material to maintain a constant temperature inside the box.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the method for measuring the loss of magnetic components as described in any one of claims 1 to 5.

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