WO2021114813A1 - High-frequency wireless charging efficiency and loss testing system and method - Google Patents

High-frequency wireless charging efficiency and loss testing system and method Download PDF

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Publication number
WO2021114813A1
WO2021114813A1 PCT/CN2020/117347 CN2020117347W WO2021114813A1 WO 2021114813 A1 WO2021114813 A1 WO 2021114813A1 CN 2020117347 W CN2020117347 W CN 2020117347W WO 2021114813 A1 WO2021114813 A1 WO 2021114813A1
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wireless charging
coil
frequency
loss
test
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PCT/CN2020/117347
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French (fr)
Chinese (zh)
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许校嘉
张政
胡新跃
申屠嘉辉
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横店集团东磁股份有限公司
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Publication of WO2021114813A1 publication Critical patent/WO2021114813A1/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00Arrangements for measuring electric power or power factor
    • G01R21/001Measuring real or reactive component; Measuring apparent energy
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2688Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
    • G01R27/2694Measuring dielectric loss, e.g. loss angle, loss factor or power factor

Definitions

  • the invention relates to the field of wireless charging, in particular to a high-frequency wireless charging efficiency and loss testing system and method.
  • a "wireless charging system and its control method” disclosed in Chinese patent documents, its announcement number CN104716747B, and its application number on December 8, 2017, include impedance matching of the antenna to make the resonant frequency of the wireless charging system The point falls within an operating frequency range; to track the best frequency point, first transmit the test signal at a set transmission frequency, and calculate its transmission efficiency; determine whether the transmission efficiency meets the requirements, if not, repeat the above "Procedure" Optimal frequency point tracking, first transmit the test signal at a set transmission frequency and calculate its transmission efficiency” step until the transmission efficiency meets the requirements; if the transmission efficiency meets the requirements, set the transmission frequency to the best frequency point ; Use the optimal frequency point as the operating frequency of the system for charging; wherein, when tracking the optimal frequency point, one of the following two steps is used to determine whether the transmission efficiency meets the requirements: Step 1: Determine the efficiency change and Whether the ratio of frequency change is less than or equal to zero; if the ratio is greater than zero, add a frequency value to the originally set transmission
  • the present invention is to overcome the problem of low charging efficiency caused by material limitation of wireless charging in the prior art, and provides a high-frequency wireless charging efficiency and loss testing system and method, which can accurately test the wireless charging efficiency and loss under high frequency.
  • the high-frequency wireless charging performance test provides a method.
  • a high-frequency wireless charging efficiency and loss test system including a signal generator, a power amplifier, a test circuit test load, an oscilloscope and a controller, the signal generator and the The input end of the power amplifier is connected, the signal generator is used to generate a high-frequency signal required for testing, the output end of the power amplifier is connected to the input end of the test circuit, and the test load is connected to the output end of the test circuit
  • a wireless charging transmitting coil and a wireless charging receiving coil are connected between the input terminal and the output terminal of the test circuit, and the power amplifier is used to convert the high-frequency signal generated by the signal generator into a high-frequency power source.
  • the oscilloscope is connected to the test resistor, and the oscilloscope is used to display the waveforms of the current and voltage applied to the test load.
  • the signal generator and the oscilloscope are both connected to the controller.
  • the high-frequency signal used in the test is generated by the signal generator, which is amplified by the power amplifier to form a high-frequency power source, which is connected to the test circuit through a wire and used as a charging power source for the test circuit.
  • the voltage and current waveforms are displayed by an oscilloscope to adjust the test circuit.
  • the phase difference between the input current and the output current and the input voltage and the output voltage reduces the test error, the system is simple and convenient, and the cost is low.
  • the test circuit includes an ammeter A1, an ammeter A2, a voltmeter V1, a voltmeter V2, a resonant capacitor C1, and a resonant capacitor C2.
  • the wireless charging transmitting coil and the wireless charging receiving coil are respectively equipped with magnetic sheets.
  • the coil P1 and the coil P2 with the magnetic sheet the first end of the ammeter A1 is connected to the first end of the high-frequency power supply, and the second end of the ammeter A1 is connected to one end of the coil P1 with the magnetic sheet Connected, the second end of the high-frequency power supply is connected to the first end of the resonant capacitor C1, the second end of the resonant capacitor C1 is connected to the other end of the coil P1 with a magnetic sheet, and the voltmeter V1 is connected in parallel At both ends of the coil P1 with a magnetic sheet, the voltmeter V2 is connected in parallel to both ends of the coil P2 with a magnetic sheet, and the first end of the current meter A2 is connected to one end of the coil P2 with a magnetic sheet , The second end of the ammeter A2 is connected to the first end of the test load, the first end of the resonant capacitor C2 is connected to the other end of the coil P2 with a magnetic sheet, and the second end of the resonant
  • the current of the test circuit is detected by the ammeter A1 and the ammeter A2, and the voltage of the test circuit is detected by the voltmeter V1 and the voltmeter V2, which is convenient for the subsequent calculation of the wireless charging efficiency of the test circuit.
  • the coil is a magnetic sheet coil.
  • the magnetic sheet coils of different materials are tested to compare their wireless charging conversion efficiency and loss. Through loss analysis, the reasons that affect the wireless charging conversion efficiency are selected. Suitable wireless charging materials are selected to improve wireless charging efficiency and provide high-frequency wireless charging performance testing. ⁇ The method.
  • the material and shape of the magnetic sheet can be arbitrarily replaced.
  • the present invention also provides a high-frequency wireless charging efficiency and loss test method, which includes the following steps: S01: Start the signal generator to generate a voltage signal of the required frequency for the test, and adjust the power amplifier to output a stable high-frequency power voltage; S02: Select and adjust the resonant capacitor C1 and the resonant capacitor C2 so that the phase difference between the voltage and current on the coil P1 with the magnetic sheet and the coil P2 with the magnetic sheet is 0°; S03: When calculating the test band Magnetic induction intensity on the coil P2 with magnetic sheet; S04: Calculate the conversion efficiency of wireless charging.
  • the calculation formula of the magnetic induction intensity during the test is:
  • N 1 is the number of turns of the coil P1
  • a e is the effective cross-sectional area of the magnetic sheet
  • f is the test frequency
  • u out is the output voltage measured by the voltmeter V2
  • B is the magnetic induction intensity. The magnetic induction intensity during the test is calculated, and the magnetic induction intensity is included in the analysis when the wireless charging material is selected to prevent excessive magnetic induction from causing pollution or damage to the human body, and to ensure that the selected wireless charging material is a safe and pollution-free material.
  • the conversion efficiency of the wireless charging is obtained by calculating the input power and the output power, and the calculation formula of the input power is:
  • P in is the input power P1 of the coil
  • f is the test frequency
  • u in is measured by the voltmeter V1 input voltage, i in a current meter A1 input of the current measured
  • P out is the output power of the coil P2
  • u out is the output terminal voltage measured by the voltmeter V2
  • i out is the output terminal current measured by the ammeter A2;
  • the conversion efficiency of the magnetic sheet is:
  • is the conversion efficiency of wireless charging. Calculate the input power and output power of the test circuit through the voltage and current, and calculate the wireless charging conversion efficiency of the magnetic sheet through the input power and output power.
  • the factors that determine the conversion efficiency of the magnetic sheet include hysteresis loss, eddy current loss and copper wire loss, where the calculation formula of eddy current loss is:
  • is the electrical conductivity of the magnetic sheet
  • is the magnetic permeability of the magnetic sheet
  • d is the width of the magnetic sheet
  • f is the test frequency
  • P cl is the eddy current loss power.
  • the resistance R Cu of the copper wire is measured by a multimeter, and the calculation formula of the copper wire loss is:
  • P Cul is the power loss of the copper wire used in the coil P1 and the coil P1
  • f is the test frequency
  • i in is the current at the input of the coil P1 measured by the ammeter A1
  • i out is the output of the coil P2 measured by the ammeter A2
  • the terminal current, R Cu is the resistance of the copper wire.
  • the calculation formula of the hysteresis loss is:
  • P in is the input power winding P1
  • P out is the output power winding P2
  • P Cul copper wire power loss P hl hysteresis loss of power
  • the wireless charging efficiency test system is constructed by a simple circuit, which is simple and convenient, and saves costs; (2) The magnetic sheet coil made of different materials is used to calculate the charging conversion of the material Efficiency, select more suitable wireless charging materials; (3) By accurately testing the wireless charging efficiency and loss under high frequency, it provides a method for high-frequency wireless charging performance testing and provides a basis for improving wireless charging efficiency.
  • Fig. 1 is a schematic diagram of the structure of the test system of the first embodiment.
  • Fig. 2 is a schematic diagram of the circuit connection of the test circuit of the first embodiment.
  • a high-frequency wireless charging efficiency and loss test system as shown in Figure 1, includes a signal generator 1, a power amplifier 2, a test circuit 3, a test load 5, an oscilloscope 4 and a controller, and the signal generator 1 Connect with the input end of the power amplifier 2.
  • the signal generator 1 is used to generate the high-frequency signal required for testing, the output end of the power amplifier 2 is connected with the test circuit 3, and the power amplifier 2 is used to transfer the high-frequency signal generated by the signal generator 1.
  • the signal is converted into a high-frequency power source, the test circuit 3 is connected to an oscilloscope 4, and the oscilloscope 4 is used to display the current waveform and size and the voltage waveform and size on the test circuit 3.
  • a coil P1 with a magnetic sheet and a coil P2 with a magnetic sheet are connected between the input terminal and the output terminal of the test circuit, which respectively serve as a wireless charging transmitting coil and a wireless charging receiving coil.
  • the test circuit 3 includes ammeter A1, ammeter A2, voltmeter V1, voltmeter V2, resonant capacitor C1, and resonant capacitor C2.
  • the other end of the coil P1 of the sheet is connected, the voltmeter V1 is connected in parallel with the two ends of the coil P1 with the magnetic sheet, the voltmeter V2 is connected in parallel with both ends of the coil P2 with the magnetic sheet, and the first end of the ammeter A2 is connected with the One end of the coil P2 with a magnetic sheet is connected, the second end of the ammeter A2 is connected with the first end of the test load 5, and the first end of the resonance capacitor C2 is connected with the other end of the coil P2 with a magnetic sheet. The second end is connected to the second end of the test load 5.
  • the material and shape of the magnetic sheet can be replaced arbitrarily.
  • a high-frequency wireless charging efficiency and loss test method including the following steps: S01: Start the signal generator 1 to generate a voltage signal of the required frequency for the test, and adjust the power amplifier 2 to output a stable high-frequency power voltage; S02: Select and adjust the resonant capacitor C1 and the resonant capacitor C2 so that the phase difference between the voltage and current on the coil P1 with the magnetic sheet and the coil P2 with the magnetic sheet is 0°.
  • N 1 is the number of turns of the coil P1
  • a e is the effective cross-sectional area of the magnetic sheet
  • f is the test frequency
  • u out is the output voltage measured by the voltmeter V2
  • B is the magnetic induction intensity.
  • P in is the input power P1 of the coil
  • f is the test frequency
  • u in is measured by the voltmeter V1 input voltage, i in a current meter A1 measured input current
  • output power calculation formula is:
  • P out is the output power of the coil P2
  • u out is the output voltage measured by the voltmeter V2
  • i out is the output current measured by the ammeter A2
  • the conversion efficiency of the magnetic sheet is:
  • is the conversion efficiency of the magnetic sheet.
  • the factors that determine the conversion efficiency of the magnetic sheet include hysteresis loss, eddy current loss and copper wire loss. Among them, the calculation formula of eddy current loss is:
  • is the electrical conductivity of the magnetic sheet
  • is the magnetic permeability of the magnetic sheet
  • d is the width of the magnetic sheet
  • f is the test frequency
  • P cl is the eddy current loss power
  • the resistance of the copper wire R Cu is measured by a multimeter.
  • the calculation formula of line loss is:
  • P Cul is the power loss of the copper wire used by the coil P1 and the coil P1
  • f is the test frequency
  • i in is the input current measured by the ammeter A1
  • i out is the output current measured by the ammeter A2
  • R Cu Is the resistance of the copper wire
  • the calculation formula of hysteresis loss is:
  • P Cul is the power loss of the copper wire.
  • Embodiment 2 the signal generator 1 is adjusted to output a signal with a frequency of 1 MHz, which is amplified by the power amplifier 2 and used as the power supply for the test circuit 3.
  • the magnification of the amplifier 2 controls the input power of the test circuit 3.
  • the magnetic coil made of nanocrystalline MS700 is selected for testing, and the input power is adjusted to 1W. After testing, the output power is calculated to be 0.909W, and its conversion efficiency is 90.90%.
  • the loss is 0.091, of which, the copper wire loss is 0.0345, the hysteresis loss is 0.0188, and the eddy current loss is 0.0376; the input power is adjusted to 13W, and the output power is calculated to be 11.47W after testing, the conversion efficiency is 88.23%, and the total loss is 1.53.
  • the copper wire loss is 0.4355
  • the hysteresis loss is 0.6399
  • the eddy current loss is 0.4545.
  • the third embodiment is to adjust the signal generator 1 to output a signal with a frequency of 1MHZ, select a magnetic coil made of manganese-zinc ferrite FS600B for testing, adjust the input power to 1W, and calculate the output power to be 0.938W after testing.
  • the conversion efficiency is 93.8%, and the total loss is 0.062.
  • the copper wire loss is 0.0319
  • the hysteresis loss is 0.0195
  • the eddy current loss is 0.0105
  • the adjusted input power is 13W
  • the output power is calculated to be 11.92W after testing, and its conversion efficiency is 91.69 %
  • the total loss is 1.08, of which, the copper wire loss is 0.4173, the hysteresis loss is 0.5264, and the eddy current loss is 0.1362.
  • the fourth embodiment is to adjust the signal generator 1 to output a signal with a frequency of 1MHZ, select a magnetic coil made of nickel-zinc ferrite FS700 for testing, adjust the input power to 1W, and calculate the output power to be 0.922W after testing.
  • the conversion efficiency is 92.2%, and the total loss is 0.078.
  • the copper wire loss is 0.0334
  • the hysteresis loss is 0.0330
  • the eddy current loss is 0.0115
  • the adjusted input power is 13W
  • the output power is calculated to be 11.48W after testing, and its conversion efficiency is 88.31 %
  • the total loss is 1.52, of which, the copper wire loss is 0.4223, the hysteresis loss is 0.9541, and the eddy current loss is 0.1435.

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Abstract

A high-frequency wireless charging efficiency and loss testing system and method, the testing system comprising a signal generator (1), a power amplifier (2), a test circuit (3), a test load (5), an oscilloscope (4), and a controller (6), the signal generator (1) being connected to the power amplifier (2), the signal generator (1) being used for producing high-frequency signals required for testing, an output end of the power amplifier (2) being connected to an input end of the test circuit (3), a wireless charging transmission coil (P1) and a wireless charging receiving coil (P2) being connected between the input end and an output end of the test circuit (3), the power amplifier (2) being used for converting the high-frequency signals produced by the signal generator (1) into a high-frequency power source, and the signal generator (1) and the oscilloscope (4) both being connected to the controller (6). By means of using magnetic sheet coils made of different materials and calculating the charging conversion efficiency of said materials, more suitable wireless charging materials can be selected; by means of precisely testing wireless charging efficiency and loss at high frequencies, a method is provided for testing high-frequency wireless charging performance, providing a foundation for improving wireless charging efficiency.

Description

一种高频无线充电效率及损耗测试系统及方法High-frequency wireless charging efficiency and loss testing system and method 技术领域Technical field
本发明涉及无线充电领域,尤其是涉及一种高频无线充电效率及损耗测试系统及方法。The invention relates to the field of wireless charging, in particular to a high-frequency wireless charging efficiency and loss testing system and method.
背景技术Background technique
电子设备一直在往小型化、轻薄化和高效率方向发展,人们使用电子设备越来越频繁,更快更高效地给电子设备充电显得尤为重要,无线充电技术可以让电子设备的充电变得更加方便快捷,而无线充电的效率是影响无线充电的主要因素。因此,准确地测量无线充电的效率和损耗,尤其是高频条件下的无线充电效率和损耗可以定量地评价无线充电的优劣,从而选择出高性能的无线充电材料,提供给电子产品使用。Electronic devices have been developing in the direction of miniaturization, thinning and high efficiency. People use electronic devices more and more frequently. It is particularly important to charge electronic devices faster and more efficiently. Wireless charging technology can make the charging of electronic devices more Convenient and fast, and the efficiency of wireless charging is the main factor affecting wireless charging. Therefore, accurately measuring the efficiency and loss of wireless charging, especially the efficiency and loss of wireless charging under high-frequency conditions, can quantitatively evaluate the advantages and disadvantages of wireless charging, so as to select high-performance wireless charging materials for use in electronic products.
例如,一种在中国专利文献上公开的“无线充电系统及其控制方法”,其公告号CN104716747B,其申请号2017年12月08日,包括对天线进行阻抗匹配,使无线充电系统的共振频率点落在一操作频率范围内;进行最佳频率点追踪,先以一设定的发射频率传送测试信号,并计算其传输效率;判断传输效率是否符合要求,若不符合要求,重复上述“进行最佳频率点追踪,先以一设定的发射频率传送测试信号,并计算其传输效率”步骤,直到传输效率符合要求;若传输效率符合要求,将所述发射频率设定为最佳频率点;以所述最佳频率点作为系统操作频率进行充电;其中,进行最佳频率点追踪时,由以下两种步骤的其中一种步骤决定传输效率是否符合要求:步骤一:判断其效率变化与频率变化的比值是否小于或等于零;若比值大于零,即在原设定的发射频率上累加一频率值,随即重新设定发射频率、传送测试信号、计算所述测试信号的传输效率,并重新判断其效率变化与频率变化的比值是否小于或等于零;当所述比值小于或等于零,即将所述发射频率设定为最佳频率点;步骤二:判断其效率变化与频率变化的比值是否大于或等于零;若比值小于零,即在原设定的发射频率上递减一频率值,随即重新设定发射频率、传送测试信号、计算所述测试信号的传输效率,并重新判断其效率变化与频率变化的比值是否大于或等于零;当所述比值大于或等于零,即将所述发射频率设定为最佳频率点。通过选取最佳频率点,提高无线充电的充电效率,但是没有从充电材料的方面进行考虑, 提高的充电效率受到材料的限制,无法有效的提高充电效率。For example, a "wireless charging system and its control method" disclosed in Chinese patent documents, its announcement number CN104716747B, and its application number on December 8, 2017, include impedance matching of the antenna to make the resonant frequency of the wireless charging system The point falls within an operating frequency range; to track the best frequency point, first transmit the test signal at a set transmission frequency, and calculate its transmission efficiency; determine whether the transmission efficiency meets the requirements, if not, repeat the above "Procedure" Optimal frequency point tracking, first transmit the test signal at a set transmission frequency and calculate its transmission efficiency" step until the transmission efficiency meets the requirements; if the transmission efficiency meets the requirements, set the transmission frequency to the best frequency point ; Use the optimal frequency point as the operating frequency of the system for charging; wherein, when tracking the optimal frequency point, one of the following two steps is used to determine whether the transmission efficiency meets the requirements: Step 1: Determine the efficiency change and Whether the ratio of frequency change is less than or equal to zero; if the ratio is greater than zero, add a frequency value to the originally set transmission frequency, then reset the transmission frequency, transmit the test signal, calculate the transmission efficiency of the test signal, and judge again Whether the ratio of the efficiency change to the frequency change is less than or equal to zero; when the ratio is less than or equal to zero, the transmitting frequency is set as the optimal frequency point; Step 2: Determine whether the ratio of the efficiency change to the frequency change is greater than or equal to zero ; If the ratio is less than zero, the frequency value is decremented from the originally set transmitting frequency, then the transmitting frequency is reset, the test signal is transmitted, the transmission efficiency of the test signal is calculated, and the ratio of the efficiency change to the frequency change is re-judged Whether it is greater than or equal to zero; when the ratio is greater than or equal to zero, the transmitting frequency is set as the optimal frequency point. By selecting the optimal frequency point, the charging efficiency of wireless charging is improved, but without considering the charging material, the improved charging efficiency is limited by the material, and the charging efficiency cannot be effectively improved.
发明内容Summary of the invention
本发明是为了克服现有技术的无线充电受到材料限制导致充电效率低的问题,提供一种高频无线充电效率及损耗测试系统及方法,可以精确测试高频下的无线充电效率及损耗,为高频无线充电性能测试提供了方法。The present invention is to overcome the problem of low charging efficiency caused by material limitation of wireless charging in the prior art, and provides a high-frequency wireless charging efficiency and loss testing system and method, which can accurately test the wireless charging efficiency and loss under high frequency. The high-frequency wireless charging performance test provides a method.
为了实现上述目的,本发明采用以下技术方案:一种高频无线充电效率及损耗测试系统,包括信号发生器、功率放大器、测试电路测试负载、示波器和控制器,所述信号发生器与所述功率放大器的输入端连接,所述信号发生器用于产生测试所需的高频信号,所述功率放大器的输出端与所述测试电路输入端连接,所述测试负载与所述测试电路输出端连接,所述测试电路输入端和输出端之间连接有无线充电发射线圈及无线充电接收线圈,所述功率放大器用于将所述信号发生器产生的高频信号转换成高频功率电源,所述示波器与测试电阻连接,所述示波器用于显示加到测试负载上的电流及电压的波形,所述信号发生器以及示波器均与控制器连接。通过信号发生器产生测试所用的高频信号,经功率放大器放大后形成一高频功率电源,通过导线与测试电路连接,当做测试电路的充电电源,通过示波器显示电压和电流的波形,调节测试电路输入电流与输出电流以及输入电压与输出电压之间的相位差,减小测试误差,系统简易方便,成本低。In order to achieve the above objectives, the present invention adopts the following technical solutions: a high-frequency wireless charging efficiency and loss test system, including a signal generator, a power amplifier, a test circuit test load, an oscilloscope and a controller, the signal generator and the The input end of the power amplifier is connected, the signal generator is used to generate a high-frequency signal required for testing, the output end of the power amplifier is connected to the input end of the test circuit, and the test load is connected to the output end of the test circuit A wireless charging transmitting coil and a wireless charging receiving coil are connected between the input terminal and the output terminal of the test circuit, and the power amplifier is used to convert the high-frequency signal generated by the signal generator into a high-frequency power source. The oscilloscope is connected to the test resistor, and the oscilloscope is used to display the waveforms of the current and voltage applied to the test load. The signal generator and the oscilloscope are both connected to the controller. The high-frequency signal used in the test is generated by the signal generator, which is amplified by the power amplifier to form a high-frequency power source, which is connected to the test circuit through a wire and used as a charging power source for the test circuit. The voltage and current waveforms are displayed by an oscilloscope to adjust the test circuit. The phase difference between the input current and the output current and the input voltage and the output voltage reduces the test error, the system is simple and convenient, and the cost is low.
作为优选,所述测试电路包括电流计A1、电流计A2、电压计V1、电压计V2、谐振电容C1和谐振电容C2,所述无线充电发射线圈及无线充电接收线圈分别为带有磁片的线圈P1和带有磁片的线圈P2,所述电流计A1的第一端与高频功率电源的第一端连接,所述电流计A1的第二端与带有磁片的线圈P1的一端连接,所述高频功率电源的第二端与谐振电容C1的第一端连接,所述谐振电容C1的第二端与带有磁片的线圈P1的另一端连接,所述电压计V1并联在带有磁片的线圈P1的两端,所述电压计V2并联在带有磁片的线圈P2的两端,所述电流计A2的第一端与带有磁片的线圈P2的一端连接,所述电流计A2的第二端与测试负载第一端连接,所述谐振电容C2的第一端与带有磁片的线圈P2的另一端连接,所述谐振电容C2的第二端与测试负载的第二端连接。通过电流计A1和电流计A2对测试电路的电流进行检测,通过电压计V1和电压计V2对测试电路的电压进行检测,便于后续计算测试电路的无线充电效率, 线圈为磁片线圈,通过对不同材料的磁片线圈进行测试,比较其无线充电转换效率以及损耗,通过损耗分析影响无线充电转换效率的原因,选取合适的无线充电材料,提高无线充电效率的同时为高频无线充电性能测试提供了方法。所述的磁片的材料和形状是可以任意替换的。Preferably, the test circuit includes an ammeter A1, an ammeter A2, a voltmeter V1, a voltmeter V2, a resonant capacitor C1, and a resonant capacitor C2. The wireless charging transmitting coil and the wireless charging receiving coil are respectively equipped with magnetic sheets. The coil P1 and the coil P2 with the magnetic sheet, the first end of the ammeter A1 is connected to the first end of the high-frequency power supply, and the second end of the ammeter A1 is connected to one end of the coil P1 with the magnetic sheet Connected, the second end of the high-frequency power supply is connected to the first end of the resonant capacitor C1, the second end of the resonant capacitor C1 is connected to the other end of the coil P1 with a magnetic sheet, and the voltmeter V1 is connected in parallel At both ends of the coil P1 with a magnetic sheet, the voltmeter V2 is connected in parallel to both ends of the coil P2 with a magnetic sheet, and the first end of the current meter A2 is connected to one end of the coil P2 with a magnetic sheet , The second end of the ammeter A2 is connected to the first end of the test load, the first end of the resonant capacitor C2 is connected to the other end of the coil P2 with a magnetic sheet, and the second end of the resonant capacitor C2 is connected to the The second end of the test load is connected. The current of the test circuit is detected by the ammeter A1 and the ammeter A2, and the voltage of the test circuit is detected by the voltmeter V1 and the voltmeter V2, which is convenient for the subsequent calculation of the wireless charging efficiency of the test circuit. The coil is a magnetic sheet coil. The magnetic sheet coils of different materials are tested to compare their wireless charging conversion efficiency and loss. Through loss analysis, the reasons that affect the wireless charging conversion efficiency are selected. Suitable wireless charging materials are selected to improve wireless charging efficiency and provide high-frequency wireless charging performance testing.了方法。 The method. The material and shape of the magnetic sheet can be arbitrarily replaced.
本发明还提供一种高频无线充电效率及损耗测试方法,包括以下步骤:S01:启动信号发生器使其产生测试所需频率的电压信号,调节功率放大器使其输出稳定的高频功率电压;S02:选取并调节谐振电容C1和谐振电容C2,使带有磁片的线圈P1和带有磁片的线圈P2上的电压和电流之间的相位差都为0°;S03:计算测试时带有磁片的线圈P2上的磁感应强度;S04:计算无线充电的转换效率。The present invention also provides a high-frequency wireless charging efficiency and loss test method, which includes the following steps: S01: Start the signal generator to generate a voltage signal of the required frequency for the test, and adjust the power amplifier to output a stable high-frequency power voltage; S02: Select and adjust the resonant capacitor C1 and the resonant capacitor C2 so that the phase difference between the voltage and current on the coil P1 with the magnetic sheet and the coil P2 with the magnetic sheet is 0°; S03: When calculating the test band Magnetic induction intensity on the coil P2 with magnetic sheet; S04: Calculate the conversion efficiency of wireless charging.
作为优选,所述的步骤S03中,测试时的磁感应强度计算式为:Preferably, in the step S03, the calculation formula of the magnetic induction intensity during the test is:
Figure PCTCN2020117347-appb-000001
Figure PCTCN2020117347-appb-000001
其中N 1是线圈P1的匝数,A e是磁片的有效横截面积,f是测试频率,u out为电压计V2测得的输出端电压,B为磁感应强度。对测试时的磁感应强度进行计算,在选取无线充电材料时将磁感应强度纳入分析中,防止出现磁感应强度过高造成污染或损害人体的情况,保证选取的无线充电材料是安全无污染的材料。 Where N 1 is the number of turns of the coil P1, A e is the effective cross-sectional area of the magnetic sheet, f is the test frequency, u out is the output voltage measured by the voltmeter V2, and B is the magnetic induction intensity. The magnetic induction intensity during the test is calculated, and the magnetic induction intensity is included in the analysis when the wireless charging material is selected to prevent excessive magnetic induction from causing pollution or damage to the human body, and to ensure that the selected wireless charging material is a safe and pollution-free material.
作为优选,所述步骤S04中,所述无线充电的转换效率通过计算输入功率和输出功率获得,输入功率的计算式为:Preferably, in the step S04, the conversion efficiency of the wireless charging is obtained by calculating the input power and the output power, and the calculation formula of the input power is:
Figure PCTCN2020117347-appb-000002
Figure PCTCN2020117347-appb-000002
其中,P in为线圈P1的输入功率,f是测试频率,u in是电压计V1测得的输入端电压,i in是电流计A1测得的输入端电流; Wherein, P in is the input power P1 of the coil, f is the test frequency, u in is measured by the voltmeter V1 input voltage, i in a current meter A1 input of the current measured;
输出功率的计算式为:The calculation formula of output power is:
Figure PCTCN2020117347-appb-000003
Figure PCTCN2020117347-appb-000003
其中,P out是线圈P2的输出功率,u out是电压计V2测得的输出端电压,i out是电流计A2测得的输出端电流; Among them, P out is the output power of the coil P2, u out is the output terminal voltage measured by the voltmeter V2, and i out is the output terminal current measured by the ammeter A2;
磁片的转换效率为:The conversion efficiency of the magnetic sheet is:
Figure PCTCN2020117347-appb-000004
Figure PCTCN2020117347-appb-000004
其中,μ是无线充电的转换效率。通过电压以及电流计算测试电路的输入功率和输出功率,通过输入功率和输出功率计算磁片的无线充电转换效率。Among them, μ is the conversion efficiency of wireless charging. Calculate the input power and output power of the test circuit through the voltage and current, and calculate the wireless charging conversion efficiency of the magnetic sheet through the input power and output power.
作为优选,决定所述磁片转换效率的因素包括磁滞损耗、涡流损耗以及铜线损耗,其中,涡流损耗的计算式为:Preferably, the factors that determine the conversion efficiency of the magnetic sheet include hysteresis loss, eddy current loss and copper wire loss, where the calculation formula of eddy current loss is:
Figure PCTCN2020117347-appb-000005
Figure PCTCN2020117347-appb-000005
其中,σ是磁片的电导率,μ是磁片的磁导率,d是磁片的宽度,f是测试频率,P cl是涡流损耗功率。通过涡流损耗的计算,对材料本身以及材料的宽度进行选取,选取出涡流损耗较小的无线充电材料。 Among them, σ is the electrical conductivity of the magnetic sheet, μ is the magnetic permeability of the magnetic sheet, d is the width of the magnetic sheet, f is the test frequency, and P cl is the eddy current loss power. Through the calculation of eddy current loss, the material itself and the width of the material are selected, and the wireless charging material with smaller eddy current loss is selected.
作为优选,通过万用表测得铜线的电阻R Cu,所述铜线损耗的计算式为: Preferably, the resistance R Cu of the copper wire is measured by a multimeter, and the calculation formula of the copper wire loss is:
Figure PCTCN2020117347-appb-000006
Figure PCTCN2020117347-appb-000006
其中,P Cul是线圈P1和线圈P1使用的铜线的损耗功率,f是测试频率,i in是电流计A1测得的线圈P1输入端电流,i out是电流计A2测得的线圈P2输出端电流,R Cu是铜线的电阻。通过铜线损耗的计算,将测试电路的导线对无线充电效率的影响进行排除,减小测试误差。 Among them, P Cul is the power loss of the copper wire used in the coil P1 and the coil P1, f is the test frequency, i in is the current at the input of the coil P1 measured by the ammeter A1, and i out is the output of the coil P2 measured by the ammeter A2 The terminal current, R Cu is the resistance of the copper wire. Through the calculation of copper wire loss, the influence of the wires of the test circuit on the wireless charging efficiency is eliminated, and the test error is reduced.
作为优选,所述的磁滞损耗的计算式为:Preferably, the calculation formula of the hysteresis loss is:
P hl=(P in-P out)-P cl-P Cul    (7) P hl = (P in -P out )-P cl -P Cul (7)
其中,P hl为磁滞损耗功率,P in为线圈P1的输入功率,P out是线圈P2的输出功率,P Cul是铜线损耗功率。 Wherein, P hl hysteresis loss of power, P in is the input power winding P1, P out is the output power winding P2, P Cul copper wire power loss.
因此,本发明具有如下有益效果:(1)通过简单的电路搭建无线充电效率测试系统,简易方便,节约成本;(2)通过采用不同的材料制作成的磁片线 圈,计算该材料的充电转换效率,选取出更加合适的无线充电材料;(3)通过精确测试高频下的无线充电效率及损耗,为高频无线充电性能测试提供了方法,为无线充电效率的提高提供了基础。Therefore, the present invention has the following beneficial effects: (1) The wireless charging efficiency test system is constructed by a simple circuit, which is simple and convenient, and saves costs; (2) The magnetic sheet coil made of different materials is used to calculate the charging conversion of the material Efficiency, select more suitable wireless charging materials; (3) By accurately testing the wireless charging efficiency and loss under high frequency, it provides a method for high-frequency wireless charging performance testing and provides a basis for improving wireless charging efficiency.
附图说明Description of the drawings
图1是实施例一的测试系统的结构示意图。Fig. 1 is a schematic diagram of the structure of the test system of the first embodiment.
图2是实施例一的测试电路的电路连接原理图。Fig. 2 is a schematic diagram of the circuit connection of the test circuit of the first embodiment.
图中:1、信号发生器,2、功率放大器,3、测试电路。4、示波器,5、测试负载,6、控制器。In the figure: 1. Signal generator, 2. Power amplifier, 3. Test circuit. 4. Oscilloscope, 5. Test load, 6. Controller.
具体实施方式Detailed ways
下面结合附图与具体实施方式对本发明做进一步的描述。The present invention will be further described below in conjunction with the drawings and specific embodiments.
实施例一,一种高频无线充电效率及损耗测试系统,如图1所示,包括信号发生器1、功率放大器2、测试电路3、测试负载5、示波器4和控制器,信号发生器1与功率放大器2的输入端连接,信号发生器1用于产生测试所需的高频信号,功率放大器2的输出端与测试电路3连接,功率放大器2用于将信号发生器1产生的高频信号转换成高频功率电源,测试电路3与示波器4连接,示波器4用于显示测试电路3上的电流波形和大小以及电压波形和大小。测试电路输入端和输出端之间连接有带有磁片的线圈P1和带有磁片的线圈P2,分别作为无线充电发射线圈及无线充电接收线圈。The first embodiment, a high-frequency wireless charging efficiency and loss test system, as shown in Figure 1, includes a signal generator 1, a power amplifier 2, a test circuit 3, a test load 5, an oscilloscope 4 and a controller, and the signal generator 1 Connect with the input end of the power amplifier 2. The signal generator 1 is used to generate the high-frequency signal required for testing, the output end of the power amplifier 2 is connected with the test circuit 3, and the power amplifier 2 is used to transfer the high-frequency signal generated by the signal generator 1. The signal is converted into a high-frequency power source, the test circuit 3 is connected to an oscilloscope 4, and the oscilloscope 4 is used to display the current waveform and size and the voltage waveform and size on the test circuit 3. A coil P1 with a magnetic sheet and a coil P2 with a magnetic sheet are connected between the input terminal and the output terminal of the test circuit, which respectively serve as a wireless charging transmitting coil and a wireless charging receiving coil.
如图2所示,测试电路3包括电流计A1、电流计A2、电压计V1、电压计V2、谐振电容C1和谐振电容C2,电流计A1的第一端与高频功率电源的第一端连接,电流计A1的第二端与带有磁片的线圈P1的一端连接,高频功率电源的第二端与谐振电容C1的第一端连接,谐振电容C1的第二端与带有磁片的线圈P1的另一端连接,电压计V1并联在带有磁片的线圈P1的两端,电压计V2并联在带有磁片的线圈P2的两端,电流计A2的第一端与带有磁片的线圈P2的一端连接,电流计A2的第二端与测试负载5第一端连接,谐振电容C2的第一端与带有磁片的线圈P2的另一端连接,谐振电容C2的第二端与测试负载5的第二端连接。磁片的材料和形状是可以任意替换的。As shown in Figure 2, the test circuit 3 includes ammeter A1, ammeter A2, voltmeter V1, voltmeter V2, resonant capacitor C1, and resonant capacitor C2. The first end of the ammeter A1 and the first end of the high-frequency power supply Connected, the second end of the ammeter A1 is connected to one end of the coil P1 with a magnetic sheet, the second end of the high-frequency power supply is connected to the first end of the resonant capacitor C1, and the second end of the resonant capacitor C1 is connected to the second end of the resonant capacitor C1. The other end of the coil P1 of the sheet is connected, the voltmeter V1 is connected in parallel with the two ends of the coil P1 with the magnetic sheet, the voltmeter V2 is connected in parallel with both ends of the coil P2 with the magnetic sheet, and the first end of the ammeter A2 is connected with the One end of the coil P2 with a magnetic sheet is connected, the second end of the ammeter A2 is connected with the first end of the test load 5, and the first end of the resonance capacitor C2 is connected with the other end of the coil P2 with a magnetic sheet. The second end is connected to the second end of the test load 5. The material and shape of the magnetic sheet can be replaced arbitrarily.
一种高频无线充电效率及损耗测试方法,包括以下步骤:S01:启动信号发生器1使其产生测试所需频率的电压信号,调节功率放大器2使其输出稳定的高频功率电压;S02:选取并调节谐振电容C1和谐振电容C2,使带有磁片的 线圈P1和带有磁片的线圈P2上的电压和电流之间的相位差都为0°。A high-frequency wireless charging efficiency and loss test method, including the following steps: S01: Start the signal generator 1 to generate a voltage signal of the required frequency for the test, and adjust the power amplifier 2 to output a stable high-frequency power voltage; S02: Select and adjust the resonant capacitor C1 and the resonant capacitor C2 so that the phase difference between the voltage and current on the coil P1 with the magnetic sheet and the coil P2 with the magnetic sheet is 0°.
S03:计算测试时的磁感应强度;测试时的磁感应强度计算式为:S03: Calculate the magnetic induction intensity during the test; the calculation formula of the magnetic induction intensity during the test is:
Figure PCTCN2020117347-appb-000007
Figure PCTCN2020117347-appb-000007
其中N 1是线圈P1的匝数,A e是磁片的有效横截面积,f是测试频率,u out为电压计V2测得的输出端电压,B为磁感应强度。 Where N 1 is the number of turns of the coil P1, A e is the effective cross-sectional area of the magnetic sheet, f is the test frequency, u out is the output voltage measured by the voltmeter V2, and B is the magnetic induction intensity.
S04:计算磁片的转换效率;磁片的转换效率通过计算输入功率和输出功率获得,输入功率的计算式为:S04: Calculate the conversion efficiency of the magnetic sheet; the conversion efficiency of the magnetic sheet is obtained by calculating the input power and the output power. The calculation formula of the input power is:
Figure PCTCN2020117347-appb-000008
Figure PCTCN2020117347-appb-000008
其中,P in为线圈P1的输入功率,f是测试频率,u in是电压计V1测得的输入端电压,i in是电流计A1测得的输入端电流;输出功率的计算式为: Wherein, P in is the input power P1 of the coil, f is the test frequency, u in is measured by the voltmeter V1 input voltage, i in a current meter A1 measured input current; output power calculation formula is:
Figure PCTCN2020117347-appb-000009
Figure PCTCN2020117347-appb-000009
其中,P out是线圈P2的输出功率,u out是电压计V2测得的输出端电压,i out是电流计A2测得的输出端电流;磁片的转换效率为: Among them, P out is the output power of the coil P2, u out is the output voltage measured by the voltmeter V2, and i out is the output current measured by the ammeter A2; the conversion efficiency of the magnetic sheet is:
Figure PCTCN2020117347-appb-000010
Figure PCTCN2020117347-appb-000010
其中,μ是磁片的转换效率。Among them, μ is the conversion efficiency of the magnetic sheet.
决定磁片转换效率的因素包括磁滞损耗、涡流损耗以及铜线损耗,其中,涡流损耗的计算式为:The factors that determine the conversion efficiency of the magnetic sheet include hysteresis loss, eddy current loss and copper wire loss. Among them, the calculation formula of eddy current loss is:
Figure PCTCN2020117347-appb-000011
Figure PCTCN2020117347-appb-000011
其中,σ是磁片的电导率,μ是磁片的磁导率,d是磁片的宽度,f是测试频率,P cl是涡流损耗功率,通过万用表测得铜线的电阻R Cu,铜线损耗的计算式 为: Among them, σ is the electrical conductivity of the magnetic sheet, μ is the magnetic permeability of the magnetic sheet, d is the width of the magnetic sheet, f is the test frequency, P cl is the eddy current loss power, and the resistance of the copper wire R Cu is measured by a multimeter. The calculation formula of line loss is:
Figure PCTCN2020117347-appb-000012
Figure PCTCN2020117347-appb-000012
其中,P Cul是线圈P1和线圈P1使用的铜线损耗功率,f是测试频率,i in是电流计A1测得的输入端电流,i out是电流计A2测得的输出端电流,R Cu是铜线的电阻,磁滞损耗的计算式为: Among them, P Cul is the power loss of the copper wire used by the coil P1 and the coil P1, f is the test frequency, i in is the input current measured by the ammeter A1, i out is the output current measured by the ammeter A2, R Cu Is the resistance of the copper wire, and the calculation formula of hysteresis loss is:
P hl=(P in-P out)-P cl-P Cul   (7) P hl = (P in -P out )-P cl -P Cul (7)
其中,P Cul是铜线损耗功率。 Among them, P Cul is the power loss of the copper wire.
实施例二,在本实施例中,如表1所示,通过调节信号发生器1,使其输出一频率为1MHZ的信号,经功率放大器2放大后作为测试电路3的供电电源,通过调节功率放大器2的放大倍数,控制测试电路3的输入功率大小,选取纳米晶MS700制作的磁片线圈进行测试,调节输入功率为1W,经过测试算出输出功率为0.909W,其转换效率为90.90%,总损耗为0.091,其中,铜线损耗为0.0345,磁滞损耗为0.0188,涡流损耗为0.0376;调节输入功率为13W,经过测试算出输出功率为11.47W,其转换效率为88.23%,总损耗为1.53,其中,铜线损耗为0.4355,磁滞损耗为0.6399,涡流损耗为0.4545。Embodiment 2. In this embodiment, as shown in Table 1, the signal generator 1 is adjusted to output a signal with a frequency of 1 MHz, which is amplified by the power amplifier 2 and used as the power supply for the test circuit 3. The magnification of the amplifier 2 controls the input power of the test circuit 3. The magnetic coil made of nanocrystalline MS700 is selected for testing, and the input power is adjusted to 1W. After testing, the output power is calculated to be 0.909W, and its conversion efficiency is 90.90%. The loss is 0.091, of which, the copper wire loss is 0.0345, the hysteresis loss is 0.0188, and the eddy current loss is 0.0376; the input power is adjusted to 13W, and the output power is calculated to be 11.47W after testing, the conversion efficiency is 88.23%, and the total loss is 1.53. Among them, the copper wire loss is 0.4355, the hysteresis loss is 0.6399, and the eddy current loss is 0.4545.
表1若干种测试材料的测试结果Table 1 Test results of several test materials
Figure PCTCN2020117347-appb-000013
Figure PCTCN2020117347-appb-000013
Figure PCTCN2020117347-appb-000014
Figure PCTCN2020117347-appb-000014
表1Table 1
实施例三,调节信号发生器1,使其输出一频率为1MHZ的信号,选取锰锌铁氧体FS600B制作的磁片线圈进行测试,调节输入功率1W,经过测试算出输出功率为0.938W,其转换效率为93.8%,总损耗为0.062,其中,铜线损耗为0.0319,磁滞损耗为0.0195,涡流损耗为0.0105;调节输入功率为13W,经过测试算出输出功率为11.92W,其转换效率为91.69%,总损耗为1.08,其中,铜线损耗为0.4173,磁滞损耗为0.5264,涡流损耗为0.1362。The third embodiment is to adjust the signal generator 1 to output a signal with a frequency of 1MHZ, select a magnetic coil made of manganese-zinc ferrite FS600B for testing, adjust the input power to 1W, and calculate the output power to be 0.938W after testing. The conversion efficiency is 93.8%, and the total loss is 0.062. Among them, the copper wire loss is 0.0319, the hysteresis loss is 0.0195, and the eddy current loss is 0.0105; the adjusted input power is 13W, and the output power is calculated to be 11.92W after testing, and its conversion efficiency is 91.69 %, the total loss is 1.08, of which, the copper wire loss is 0.4173, the hysteresis loss is 0.5264, and the eddy current loss is 0.1362.
实施例四,调节信号发生器1,使其输出一频率为1MHZ的信号,选取镍锌铁氧体FS700制作的磁片线圈进行测试,调节输入功率1W,经过测试算出输出功率为0.922W,其转换效率为92.2%,总损耗为0.078,其中,铜线损耗为0.0334,磁滞损耗为0.0330,涡流损耗为0.0115;调节输入功率为13W,经过测试算出输出功率为11.48W,其转换效率为88.31%,总损耗为1.52,其中,铜线损耗为0.4223,磁滞损耗为0.9541,涡流损耗为0.1435。The fourth embodiment is to adjust the signal generator 1 to output a signal with a frequency of 1MHZ, select a magnetic coil made of nickel-zinc ferrite FS700 for testing, adjust the input power to 1W, and calculate the output power to be 0.922W after testing. The conversion efficiency is 92.2%, and the total loss is 0.078. Among them, the copper wire loss is 0.0334, the hysteresis loss is 0.0330, and the eddy current loss is 0.0115; the adjusted input power is 13W, and the output power is calculated to be 11.48W after testing, and its conversion efficiency is 88.31 %, the total loss is 1.52, of which, the copper wire loss is 0.4223, the hysteresis loss is 0.9541, and the eddy current loss is 0.1435.
通过实施例二、实施例三以及实施例四,可以看出在相同测试频率和相同输入功率的前提下,锰锌铁氧体FS600B制作的磁片线圈的转换效率明显较高,因此,通过本发明可以选取出更加合适的无线充电材料,同时,为高频无线充电性能测试提供了方法,也为无线充电效率的提高提供了基础。Through embodiment two, embodiment three and embodiment four, it can be seen that under the premise of the same test frequency and the same input power, the conversion efficiency of the magnetic coil made of manganese-zinc ferrite FS600B is significantly higher. Therefore, through this The invention can select more suitable wireless charging materials, and at the same time, provides a method for high-frequency wireless charging performance testing, and also provides a basis for improving the efficiency of wireless charging.
以上所述的实施例只是本发明的一种较佳的方案,并非对本发明作任何形式上的限制,在不超出权利要求所记载的技术方案的前提下还有其它的变体及改型。The above-mentioned embodiment is only a preferred solution of the present invention, and does not limit the present invention in any form. There are other variations and modifications under the premise of not exceeding the technical solution described in the claims.

Claims (8)

  1. 一种高频无线充电效率及损耗测试系统,其特征是,包括A high-frequency wireless charging efficiency and loss test system, which is characterized in that it includes
    信号发生器、功率放大器、测试电路、测试负载、示波器和控制器,所述信号发生器与所述功率放大器的输入端连接,所述信号发生器用于产生测试所需的高频信号,所述功率放大器的输出端与所述测试电路输入端连接,所述测试负载与所述测试电路输出端连接,所述测试电路输入端和输出端之间连接有无线充电发射线圈及无线充电接收线圈,所述功率放大器用于将所述信号发生器产生的高频信号转换成高频功率电源,所述示波器与测试电阻连接,所述示波器用于显示加到测试负载上的电流及电压的波形,所述信号发生器以及示波器均与控制器连接。A signal generator, a power amplifier, a test circuit, a test load, an oscilloscope, and a controller, the signal generator is connected to the input end of the power amplifier, and the signal generator is used to generate high-frequency signals required for the test. The output end of the power amplifier is connected to the input end of the test circuit, the test load is connected to the output end of the test circuit, and a wireless charging transmitting coil and a wireless charging receiving coil are connected between the input end and the output end of the test circuit, The power amplifier is used to convert the high-frequency signal generated by the signal generator into a high-frequency power source, the oscilloscope is connected to a test resistor, and the oscilloscope is used to display the waveforms of current and voltage applied to the test load, Both the signal generator and the oscilloscope are connected to the controller.
  2. 根据权利要求1所述的一种高频无线充电效率及损耗测试系统,其特征是,所述测试电路包括电流计A1、电流计A2、电压计V1、电压计V2、谐振电容C1和谐振电容C2,所述无线充电发射线圈及无线充电接收线圈分别为带有磁片的线圈P1和带有磁片的线圈P2,所述电流计A1的第一端与高频功率电源的第一端连接,所述电流计A1的第二端与带有磁片的线圈P1的一端连接,所述高频功率电源的第二端与谐振电容C1的第一端连接,所述谐振电容C1的第二端与带有磁片的线圈P1的另一端连接,所述电压计V1并联在带有磁片的线圈P1的两端,所述电压计V2并联在带有磁片的线圈P2的两端,所述电流计A2的第一端与带有磁片的线圈P2的一端连接,所述电流计A2的第二端与测试负载第一端连接,所述谐振电容C2的第一端与带有磁片的线圈P2的另一端连接,所述谐振电容C2的第二端与测试负载的第二端连接。The high-frequency wireless charging efficiency and loss test system according to claim 1, wherein the test circuit includes an ammeter A1, an ammeter A2, a voltmeter V1, a voltmeter V2, a resonant capacitor C1, and a resonant capacitor C2, the wireless charging transmitting coil and the wireless charging receiving coil are respectively a coil P1 with a magnetic sheet and a coil P2 with a magnetic sheet, and the first end of the ammeter A1 is connected to the first end of the high-frequency power supply , The second end of the ammeter A1 is connected to one end of the coil P1 with a magnetic sheet, the second end of the high-frequency power source is connected to the first end of the resonant capacitor C1, and the second end of the resonant capacitor C1 The end is connected to the other end of the coil P1 with a magnetic sheet, the voltmeter V1 is connected in parallel with both ends of the coil P1 with a magnetic sheet, and the voltmeter V2 is connected in parallel with both ends of the coil P2 with a magnetic sheet, The first end of the ammeter A2 is connected to one end of the coil P2 with a magnetic sheet, the second end of the ammeter A2 is connected to the first end of the test load, and the first end of the resonant capacitor C2 is connected to the first end of the test load. The other end of the coil P2 of the magnetic sheet is connected, and the second end of the resonant capacitor C2 is connected to the second end of the test load.
  3. 一种高频无线充电效率及损耗测试方法,采用如权利要求1或2所述的一种高频无线充电效率及损耗测试系统,包括以下步骤:A high-frequency wireless charging efficiency and loss testing method, using a high-frequency wireless charging efficiency and loss testing system as claimed in claim 1 or 2, includes the following steps:
    S01:启动信号发生器使其产生测试所需频率的电压信号,调节功率放大器使其输出稳定的高频功率电压;S01: Start the signal generator to generate a voltage signal of the frequency required for the test, and adjust the power amplifier to output a stable high-frequency power voltage;
    S02:选取并调节谐振电容C1和谐振电容C2,使带有磁片的线圈P1和带有磁片的线圈P2上的电压和电流之间的相位差都为0°;S02: Select and adjust the resonant capacitor C1 and the resonant capacitor C2 so that the phase difference between the voltage and current on the coil P1 with the magnetic sheet and the coil P2 with the magnetic sheet is 0°;
    S03:计算测试时带有磁片的线圈P2上的磁感应强度;S03: Calculate the magnetic induction intensity on the coil P2 with a magnetic sheet during the test;
    S04:计算无线充电的转换效率。S04: Calculate the conversion efficiency of wireless charging.
  4. 根据权利要求3所述的一种高频无线充电效率及损耗测试方法,其特征是,所述步骤S03中,测试时带有磁片的线圈P2上的磁感应强度计算式为:A high-frequency wireless charging efficiency and loss testing method according to claim 3, characterized in that, in the step S03, the calculation formula of the magnetic induction intensity on the coil P2 with the magnetic sheet during the test is:
    Figure PCTCN2020117347-appb-100001
    Figure PCTCN2020117347-appb-100001
    其中N 1是线圈P1的匝数,A e是磁片的有效横截面积,f是测试频率,u out为电压计V2测得的输出端电压,B为磁感应强度。 Where N 1 is the number of turns of the coil P1, A e is the effective cross-sectional area of the magnetic sheet, f is the test frequency, u out is the output voltage measured by the voltmeter V2, and B is the magnetic induction intensity.
  5. 根据权利要求3所述的一种高频无线充电效率及损耗测试方法,其特征是,所述步骤S04中,所述无线充电的转换效率通过计算输入功率和输出功率获得,输入功率的计算式为:A high-frequency wireless charging efficiency and loss testing method according to claim 3, characterized in that, in the step S04, the conversion efficiency of the wireless charging is obtained by calculating the input power and the output power, and the calculation formula of the input power for:
    Figure PCTCN2020117347-appb-100002
    Figure PCTCN2020117347-appb-100002
    其中,P in为线圈P1的输入功率,f是测试频率,u in是电压计V1测得的输入端电压,i in是电流计A1测得的输入端电流; Wherein, P in is the input power P1 of the coil, f is the test frequency, u in is measured by the voltmeter V1 input voltage, i in a current meter A1 input of the current measured;
    输出功率的计算式为:The calculation formula of output power is:
    Figure PCTCN2020117347-appb-100003
    Figure PCTCN2020117347-appb-100003
    其中,P out是线圈P2的输出功率,u out是电压计V2测得的输出端电压,i out是电流计A2测得的输出端电流; Among them, P out is the output power of the coil P2, u out is the output terminal voltage measured by the voltmeter V2, and i out is the output terminal current measured by the ammeter A2;
    磁片的转换效率为:The conversion efficiency of the magnetic sheet is:
    Figure PCTCN2020117347-appb-100004
    Figure PCTCN2020117347-appb-100004
    其中,μ是无线充电的转换效率。Among them, μ is the conversion efficiency of wireless charging.
  6. 根据权利要求3所述的一种高频无线充电效率及损耗测试方法,其特征是,决定所述无线充电转换效率的因素包括磁滞损耗、涡流损耗以及铜线损耗,其中,涡流损耗的计算式为:A high-frequency wireless charging efficiency and loss testing method according to claim 3, wherein the factors determining the conversion efficiency of the wireless charging include hysteresis loss, eddy current loss and copper wire loss, wherein the calculation of eddy current loss The formula is:
    Figure PCTCN2020117347-appb-100005
    Figure PCTCN2020117347-appb-100005
    其中,σ是磁片的电导率,μ是磁片的磁导率,d是磁片的宽度,f是测试频率,P cl是涡流损耗功率。 Among them, σ is the electrical conductivity of the magnetic sheet, μ is the magnetic permeability of the magnetic sheet, d is the width of the magnetic sheet, f is the test frequency, and P cl is the eddy current loss power.
  7. 根据权利要求6所述的一种高频无线充电效率及损耗测试方法,其特征是,铜线损耗的计算式为:A high-frequency wireless charging efficiency and loss testing method according to claim 6, wherein the calculation formula of copper wire loss is:
    Figure PCTCN2020117347-appb-100006
    Figure PCTCN2020117347-appb-100006
    其中,P Cul是线圈P1和线圈P1使用的铜线的损耗功率,f是测试频率,i in是电流计A1测得的线圈P1输入端电流,i out是电流计A2测得的线圈P2输出端电流,R Cu是铜线的电阻。 Among them, P Cul is the power loss of the copper wire used in the coil P1 and the coil P1, f is the test frequency, i in is the current at the input of the coil P1 measured by the ammeter A1, and i out is the output of the coil P2 measured by the ammeter A2 The terminal current, R Cu is the resistance of the copper wire.
  8. 根据权利要求6所述的一种高频无线充电效率及损耗测试方法,其特征是,磁滞损耗的计算式为:A high-frequency wireless charging efficiency and loss testing method according to claim 6, wherein the calculation formula of hysteresis loss is:
    P hl=(P in-P out)-P cl-P Cul   (7) P hl = (P in -P out )-P cl -P Cul (7)
    其中,P hl为磁滞损耗功率,P in为线圈P1的输入功率,P out是线圈P2的输出功率,P Cul是铜线损耗功率。 Wherein, P hl hysteresis loss of power, P in is the input power winding P1, P out is the output power winding P2, P Cul copper wire power loss.
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