Loss decomposition device of flat plate type small-internal-resistance receiving end and experimental method

Abstract

The invention relates to a loss decomposition device of a flat plate type small-internal-resistance receiving end and an experiment method, and belongs to the technical field of dynamic wireless power supply. Comprising a parallel resonant inductor L0, a parallel resonant capacitor C0, a series resonant inductor L1 and a receiving end assembly, the series resonant inductor L1 and the receiving end assembly which are connected in series are connected with the parallel resonant capacitor C0 in parallel, and one end of the parallel resonant inductor L0 is connected with the parallel resonant capacitor C0 and the series resonant inductor L1; the receiving end assembly comprises a receiving end self-inductor LS, a receiving end series resonance compensation capacitor CS, a receiving end internal resistor RS and a non-inductive resistor R0. The series resonance inductor L1, the receiving end series resonance compensation capacitor CS, the receiving end self-inductor LS, the receiving end internal resistor RS and the non-inductive resistor R0 are connected in sequence. According to the invention, the influence of harmonic components on loss measurement in small internal resistance measurement is reduced, the requirement on the measurement precision of measurement equipment is reduced, and time and cost are saved; the approximate loss of the receiving end aluminum plate, the magnetic core and the coil is obtained, and operation calculation is facilitated.

Description

Technical Field

[0001] The invention relates to a loss device and an experimental method for a receiving end, and belongs to the technical field of dynamic wireless power supply. Background Art

[0002] As an important component of the automated logistics system, the Automated Guided Vehicle (AGV) effectively reduces human resources and costs and saves ground installation space by utilizing wireless power supply technology, increases endurance and work efficiency, can work for a long time without human intervention, and improves the degree of automation of warehousing logistics.

[0003] For the ground-based AGV wireless charging system, the transmitter adopts a long rail form with low construction cost, low control difficulty, and suitable for multiple loads. The shape and size of the receiver are limited to adapt to the narrow space of the AGV body installation. For small and medium power coupling mechanisms, a flat type is selected to make full use of the body space and obtain a higher power utilization rate. For this coupling mechanism, the loss of a single receiving end is an important indicator for judging performance, and it is particularly important to study the loss of the receiving end alone.

[0004] The flat receiving end is composed of a coil, a magnetic core, and an aluminum plate. It is difficult to calculate the loss of a non-uniform magnetic field. Currently, the loss results are obtained with the help of finite element simulation software to provide theoretical support for the loss measurement experiment. However, considering that the loss of the magnetic core and the aluminum plate is not easy to measure, and the measurement accuracy of the measuring equipment is required to be high, it is difficult to directly measure the loss of each part in one experiment.

[0005] Therefore, it is urgent to propose a loss decomposition device and experimental method for a flat-plate small internal resistance receiving end to solve the above technical problems. Summary of the invention

[0006] In order to solve the above problems, a loss decomposition device and experimental method for a flat-type small internal resistance receiving end are provided. A brief overview of the invention is given below to provide a basic understanding of certain aspects of the invention. It should be understood that this overview is not an exhaustive overview of the invention. It is not intended to determine the key or important parts of the invention, nor is it intended to limit the scope of the invention.

[0007] The technical solution of the present invention:

[0008] A loss decomposition device for a flat-plate type small internal resistance receiving end, comprising a parallel resonant inductor L0, a parallel resonant capacitor C0, a series resonant inductor L1 and a receiving end component, wherein the series resonant inductor L1 and the receiving end component are connected in parallel with the parallel resonant capacitor C0, and one end of the parallel resonant inductor L0 is connected with the parallel resonant capacitor C0 and the series resonant inductor L1;

[0009] The receiving end components include the receiving end self-inductance L S , receiving end series resonant compensation capacitor C S , internal resistance of receiving end R S And non-inductive resistor R0, series resonant inductor L1, receiving end series resonant compensation capacitor C S , receiving end self-inductance L S , internal resistance of receiving end R S , and non-inductive resistor R0 are connected in sequence.

[0010] Preferably, the receiving end includes a coil or a coil and a magnetic core or a coil, a magnetic core and an aluminum plate, wherein the coil, the magnetic core and the aluminum plate are stacked in sequence, and the internal resistance R of the receiving end is S It is the internal resistance of the coil or the internal resistance of the coil core or the internal resistance of the coil core aluminum plate.

[0011] Preferably: the power supply is connected to the other end of the parallel resonant inductor L0.

[0012] An experimental method for loss decomposition of a flat-type small internal resistance receiving end, using the loss decomposition device of the flat-type small internal resistance receiving end, an experimental method for loss decomposition of a flat-type small internal resistance receiving end, comprising the following steps:

[0013] Step 1: Connect the receiving end to the circuit;

[0014] Step 2: Use an LCL resonant compensation network at one end of the receiving end, without loading, so that the current flowing through the receiving end circuit remains at the rated current;

[0015] Step 3: Connect a series resonant compensation capacitor C to the receiving end S Harmony;

[0016] Step 4: Measure L S value, using L S The value is tuned to obtain the receiving end series resonant compensation capacitor C S The value of

[0017] Step 5: Measure the voltage U at the receiving end S 、Current I S .

[0018] Preferred: In step 3, L0, C0, and L1 resonate, and the receiving end is connected in series with the resonant compensation capacitor C S :

[0019]

[0020] Where w is the angular frequency.

[0021] Preferably: In step 5, use the measuring device to connect the receiving end to the series resonant compensation capacitor C SThe voltage U is obtained at the input end and the output end of the non-inductive resistor R0. S .

[0022] Preferably, the method further comprises step 6: using steps 1 to 5 to respectively calculate the losses of the coil, the magnetic core, and the aluminum plate at the receiving end, including:

[0023] ① The first set of receiving end structures includes coils, magnetic cores, and aluminum plates. The internal resistance and loss are measured, and the loss obtained is regarded as the overall loss P1.

[0024] ② The second set of receiving end structures includes coils and magnetic cores; their internal resistance and loss are measured, and the loss obtained is regarded as P2;

[0025] ③The third receiving end structure includes a coil; its internal resistance and loss are measured, and the loss obtained is regarded as P3;

[0026] ④ The second group loss P2 minus the first group loss P1 is the aluminum plate loss P Al , the third group loss P3 minus the second group loss P2 is the core loss P core , the third group loss P3 is the coil loss P coil The results of each part are the losses of the receiving end aluminum plate, magnetic core, and coil decomposed by the experiment.

[0027] The present invention has the following beneficial effects:

[0028] 1. The loss measurement of the present invention designs a small internal resistance loss measurement method, reduces the influence of harmonic components in small internal resistance measurement on loss measurement, reduces the requirements for measurement accuracy of measurement equipment, saves time and cost, and has a good prospect for promotion and application.

[0029] 2. The present invention uses multiple groups of experiments to decompose the losses of various parts of the receiving end, and indirectly obtains the approximate losses of the aluminum plate, magnetic core, and coil at the receiving end, which is convenient for operation and calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a system topology diagram for receiving end loss measurement.

[0031] Figure 2 It is a schematic diagram of the structure of the receiving end;

[0032] (2a) The first group of structures;

[0033] (2b) The second group of structures;

[0034] (2c) The third group of structures.

[0035] Figure 3 The topological diagram is a loss decomposition device of a flat-plate type small internal resistance receiving end.

[0036] Figure 4It is a schematic diagram of an experimental method for loss decomposition of a flat-plate type small internal resistance receiving end.

[0037] Figure 5 It is the voltage and current waveform diagram before and after the series resistance with different internal resistance;

[0038] (5a)R S =0.07Ω when no series resistance is connected;

[0039] (5b)R S =0.07Ω when the series resistance R0;

[0040] (5c)R S =0.03Ω when no series resistance is connected;

[0041] (5d)R S When =0.03Ω, the series resistance R0.

[0042] In the figure: L0-parallel resonant inductor, C0-parallel resonant capacitor, L1-series resonant inductor, L S - Receiver self-inductance, C S - Receiving end series resonant compensation capacitor, R S -Internal resistance of the receiving end, R0-non-inductive resistor. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0044] Specific implementation method 1: Combination Figure 1-3 The present embodiment is described. A loss decomposition device of a flat-plate type small internal resistance receiving end of the present embodiment includes a parallel resonant inductor L0, a parallel resonant capacitor C0, a series resonant inductor L1 and a receiving end component. The series resonant inductor L1 and the receiving end component arranged in series are connected in parallel with the parallel resonant capacitor C0. One end of the parallel resonant inductor L0 is connected to the parallel resonant capacitor C0 and the series resonant inductor L1.

[0045] The receiving end components include the receiving end self-inductance L S , receiving end series resonant compensation capacitor C S , internal resistance of receiving end R S And non-inductive resistor R0, series resonant inductor L1, receiving end series resonant compensation capacitor C S , receiving end self-inductance L S , internal resistance of receiving end R S, non-inductive resistor R0 are connected in sequence; the property of reducing the influence of harmonic components by using series resistors can reduce the peaks and burrs of the waveform, reduce the requirements for the accuracy of the measuring equipment, and shorten the tuning time;

[0046] The receiving end includes a coil or a coil and a magnetic core or a coil, a magnetic core and an aluminum plate, wherein the coil, the magnetic core and the aluminum plate are stacked in sequence, and the internal resistance R of the receiving end is S It is the internal resistance of the coil or the internal resistance of the coil core or the internal resistance of the coil core aluminum plate when working;

[0047] The power supply is connected to the other end of the parallel resonant inductor L0, and the power supply is controlled by an H-bridge module.

[0048] Specific implementation method 2: Combination Figure 1-5 The present embodiment is described. The present embodiment is a method for experimentally analyzing the loss of a flat plate type small internal resistance receiving end. The loss analysis device of the flat plate type small internal resistance receiving end is used. One end of the parallel resonant inductor L0 is connected to the power supply U through an H bridge. DC The other end is connected, the parallel resonant capacitor C0 and one end of the series resonant inductor L1 are connected to the other end of the parallel resonant inductor L0, and the other end of the series resonant inductor L1 and the receiving end series resonant compensation capacitor C S , receiving end self-inductance L S , internal resistance of receiving end R S , one end of the non-inductive resistor R0 is connected in series, and the other end of the non-inductive resistor R0 is connected to the power supply U through an H bridge DC One end is connected, and the other end of the parallel resonant capacitor C0 is connected to the power supply U through an H bridge. DC One end connected;

[0049] An experimental method for loss decomposition of a flat-type small internal resistance receiving end is used to measure the receiving end loss, comprising the following steps:

[0050] Step 1: Connect only the receiving end to the circuit (a flat-type small internal resistance receiving end loss decomposition device with a receiving end internal resistance R S There is no transmitter during the measurement process to ensure that the loss measurement of the receiving end is accurate;

[0051] Step 2: Use an LCL resonant compensation network at the receiving end (series resonant inductor L1 and receiving end series resonant compensation capacitor C S , receiving end self-inductance L S ), no-load, keep the current flowing through the circuit at the receiving end at the rated current; ensure that the measured loss at the receiving end is the loss at the rated power when loaded;

[0052] Step 3: Measure L S value, using L S The value is tuned to obtain the receiving end series resonant compensation capacitor C Svalue to reduce the coil voltage during measurement and avoid damage to the measuring instrument;

[0053] In step 3, L0, C0, and L1 resonate, and the receiving end is connected in series with the resonant compensation capacitor C S :

[0054]

[0055] Where w is the angular frequency;

[0056] Step 4: Connect a non-inductive resistor R0 in series with the other end of the receiving end to reduce the influence of harmonic components and make the voltage and current waveforms tend to be sinusoidal. For the receiving end, its self-inductance value is much larger than the internal resistance value, and the impedance angle is close to 90°. In order to accurately measure the active power loss, it is necessary to minimize the influence of the reactive component caused by self-inductance, such as the waveform distortion caused by multiple harmonics. Figure 1 In the measurement circuit shown, theoretical analysis shows that the internal resistance R S The value of has a great influence on the harmonic content, so a series non-inductive internal resistor is used;

[0057] Step 5: Use the measuring device to measure the voltage U at the receiving end S 、Current I S , get the receiving end loss;

[0058] In step 5, use the measuring device to connect the resonant compensation capacitor C in series with the receiving end. S The voltage U is obtained at the input end and the output end of the non-inductive resistor R0. S ;

[0059] Step 6: Use steps 3 to 5 to calculate the losses of the coil, magnetic core, and aluminum plate at the receiving end, including:

[0060] ① The first set of receiving end structures includes coils, magnetic cores, and aluminum plates. The internal resistance and loss are measured, and the loss obtained is regarded as the overall loss P1.

[0061] ② The second set of receiving end structures includes coils and magnetic cores, but does not include aluminum plates. Its internal resistance and loss are measured, and the loss obtained is regarded as P2.

[0062] ③ The third receiving end structure includes a coil but does not include a magnetic core or an aluminum plate. Its internal resistance and loss are measured, and the loss obtained is regarded as P3.

[0063] ④ The second group loss P2 minus the first group loss P1 is the aluminum plate loss P Al , the third group loss P3 minus the second group loss P2 is the core loss P core , the third group loss P3 is the coil loss P coil, the results of each part are approximately regarded as the loss of the receiving end aluminum plate, magnetic core, and coil decomposed by the experiment; using the change of loss under different structures of the receiving end, the loss data of different structures are measured, and the approximate loss of each part such as the aluminum plate, magnetic core, and coil is obtained by data processing;

[0064] If the internal resistance of the receiving end is small, the voltage waveform in the resonant network is prone to spikes and burrs, which requires a higher accuracy of the measuring equipment. The use of series resistance to reduce harmonic components improves the waveform quality and the accuracy of loss measurement. The difference in loss when the receiving end has different structures is used to measure the loss data of different structures, and the approximate loss of each part such as the aluminum plate, magnetic core, and coil is obtained through data processing, thus realizing the approximate decomposition of the loss of the receiving end by experiment.

[0065] Embodiment 1:

[0066] The measurement system used in this example is Figure 3 As shown, the LCL resonant topology is adopted, and the series internal resistance is determined by the measured system. In this example, 1Ω is selected. The influence of small internal resistance on harmonic components is verified through circuit simulation.

[0067] The frequency used by the system is 85kHz and the rated current is 24A. The experimental self-inductance values ​​of the three groups of receiving ends are not equal. Here, the values ​​of the parameters of the first group of receiving ends are taken as an example, as shown in Table 1.

[0068] Table 2 Simulation parameter values

[0069]

[0070] The voltage and current waveforms of the receiving end before and after the series resistance are obtained by simulation as follows Figure 5 As shown in the figure, it can be seen from the waveform that the voltage waveform after the series resistor is approximately a sine wave, which reduces the influence of the harmonic components. When comparing the internal resistances of the receiving end with different sizes, it is found that the smaller the internal resistance of the receiving end, the greater the influence of the harmonic components. This proves that the series resistor can effectively improve the waveform quality when the internal resistance is small.

[0071] Usually, the oscilloscope measures loss by multiplying voltage and current. Slight detuning and glitches may affect the measurement results, requiring high-precision measurement equipment. However, the sine wave with no peaks after the series resistor reduces the requirements for the measurement equipment, which proves the effectiveness of this method.

[0072] The experimental equipment and models used in Table 2 are as follows:

[0073] Table 3 Experimental equipment and models used

[0074]

[0075] The measured data are shown in Table 3. The decomposed aluminum plate, magnetic core, and coil losses are PAl, Pcore, and Pcoil, respectively, completing the loss decomposition experiment at the receiving end.

[0076] Table 3 Simulation parameter values

[0077]

[0078] The above detailed description of the embodiments of the present invention is also applicable to flat-type receiving ends with other internal resistance values.

[0079] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A loss decomposition device for a flat-plate type small internal resistance receiving end, characterized in that: It includes a parallel resonant inductor L0, a parallel resonant capacitor C0, a series resonant inductor L1 and a receiving end component, wherein the series resonant inductor L1 and the receiving end component are connected in parallel with the parallel resonant capacitor C0, and one end of the parallel resonant inductor L0 is connected with the parallel resonant capacitor C0 and the series resonant inductor L1; The receiving end components include the receiving end self-inductance L S , receiving end series resonant compensation capacitor C S 、Receiving end internal resistance R S And non-inductive resistor R0, series resonant inductor L1, receiving end series resonant compensation capacitor C S , receiving end self-inductance L S 、Receiving end internal resistance R S , and non-inductive resistor R0 are connected in sequence.

2. The loss decomposition device of a flat-plate type small internal resistance receiving end according to claim 1, characterized in that: The receiving end includes a coil or a coil and a magnetic core or a coil, a magnetic core and an aluminum plate, wherein the coil, the magnetic core and the aluminum plate are stacked in sequence, and the internal resistance R of the receiving end is S It is the internal resistance of the coil or the internal resistance of the coil core or the internal resistance of the coil core aluminum plate.

3. A loss decomposition device for a flat-plate type small internal resistance receiving end according to claim 1 or 2, characterized in that: The power supply is connected to the other end of the parallel resonant inductor L0.

4. An experimental method for loss decomposition of a flat-type small internal resistance receiving end, characterized in that: Using the loss decomposition device of a flat-plate type small internal resistance receiving end as described in any one of claims 1 to 3, an experimental method for loss decomposition of a flat-plate type small internal resistance receiving end comprises the following steps: Step 1: Connect the receiving end to the circuit; Step 2: Use an LCL resonant compensation network at one end of the receiving end, without loading, so that the current flowing through the receiving end circuit remains at the rated current; Step 3: Measure L S value, using L S The value is tuned to obtain the receiving end series resonant compensation capacitor C S The value of Step 4: Connect a non-inductive resistor R0 in series with the other end of the receiving end; Step 5: Measure the voltage U at the receiving end S 、Current I S .

5. The experimental method for loss decomposition of a flat-type small internal resistance receiving end according to claim 4 is characterized in that: In step 3, L0, C0, and L1 resonate, and the receiving end is connected in series with the resonant compensation capacitor C S : Where w is the angular frequency.

6. The experimental method for loss decomposition of a flat-type small internal resistance receiving end according to claim 4, characterized in that: In step 5, use the measuring device to connect the resonant compensation capacitor C in series with the receiving end. S The voltage U is obtained at the input end and the output end of the non-inductive resistor R0. S .

7. The experimental method for loss decomposition of a flat-type small internal resistance receiving end according to claim 4, characterized in that: The method further includes step 6: using steps 3 to 5 to respectively calculate the losses of the coil, magnetic core, and aluminum plate at the receiving end, including: ① The first set of receiving end structures includes coils, magnetic cores, and aluminum plates. The internal resistance and loss are measured, and the loss obtained is regarded as the overall loss P1. ② The second set of receiving end structures includes coils and magnetic cores; their internal resistance and loss are measured, and the loss obtained is regarded as P2; ③The third receiving end structure includes a coil; its internal resistance and loss are measured, and the loss obtained is regarded as P3; ④ The second group loss P2 minus the first group loss P1 is the aluminum plate loss P Al , the third group loss P3 minus the second group loss P2 is the core loss P core , the third group loss P3 is the coil loss P coil The results of each part are the losses of the receiving end aluminum plate, magnetic core, and coil decomposed by the experiment.

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