WO2020052023A1 - 一种基于无线充电技术的金属异物识别方法 - Google Patents

一种基于无线充电技术的金属异物识别方法 Download PDF

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Publication number
WO2020052023A1
WO2020052023A1 PCT/CN2018/113333 CN2018113333W WO2020052023A1 WO 2020052023 A1 WO2020052023 A1 WO 2020052023A1 CN 2018113333 W CN2018113333 W CN 2018113333W WO 2020052023 A1 WO2020052023 A1 WO 2020052023A1
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foreign object
wireless charging
foreign body
metal foreign
correction
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PCT/CN2018/113333
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English (en)
French (fr)
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郝鹏
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上海楚山电子科技有限公司
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Publication of WO2020052023A1 publication Critical patent/WO2020052023A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings

Definitions

  • the invention belongs to the field of wireless charging, and particularly relates to a method for identifying a foreign metal object based on wireless charging technology.
  • Wireless charging began to be widely used because of its convenience without an interface.
  • a high-power alternating magnetic field exists in the coupling space.
  • the alternating magnetic field will cause conductive materials such as metals to be affected by eddy current effects. Fever, if the heat is not released and accumulated too high, it will cause danger.
  • wireless foreign metal identification mainly includes power loss efficiency comparison method, temperature monitoring method, coil Q value method and the like.
  • the principle of the power loss efficiency comparison method is: a suitable power curve needs to be measured before use, and this curve is used to compare with the working state when judging. If it exceeds the error threshold, it is judged that there is a foreign body.
  • the disadvantage is that the consistency requirements of the product are very strict, or it must measure a suitable power curve and store a large amount of data or do fitting calculations in each product; another disadvantage of this method is its wireless transceiver It cannot support the power supply of one-to-many devices well, because the difference of the receiving end will cause the failure of foreign body determination; in addition, its principle determines that the device cannot support misaligned charging, because the misalignment will also cause power loss and other charging parameters to change This makes the foreign object determination fail.
  • the principle of the temperature monitoring method is: monitor the abnormal temperature rise of the coupling space at both ends of the transceiver, and determine that there is a foreign object if it reaches a certain threshold.
  • the disadvantages of this method are: a. In order to monitor the heat of the coupling space, additional devices such as temperature sensors need to be added. B. Because the coupling space is relatively large, in order to monitor a wide range of temperature rises, it may be necessary to add more temperature sensors. A shortcoming can be solved using thermal infrared, but thermal infrared probes need to be aligned with the target area, and their sensitivity changes with distance. At the same time, generally, the transmitting and receiving ends use a relatively complete and hard magnetic barrier, compared with infrared probes. It is difficult to find a good location to monitor the entire space, and the structure will be greatly complicated. Due to the characteristics of its optical structure, it is likely that it will be covered by foreign objects. For example, it is not convenient to use this method in outdoor conditions.
  • the principle of the coil Q value method is to calculate the Q value by adding a Q value measurement circuit or from its own loss. Once there is a metal foreign object in the space, it will affect the inductance or mutual inductance of the transmitting and receiving coils. The calculation of the coil Q is used to determine whether There are foreign bodies.
  • the disadvantages of this method are: a. Generally, in order to improve the sensitivity, an additional Q value detection coil circuit needs to be added, which increases the complexity of the system.
  • the power loss efficiency comparison method does not support one-to-many equipment power supply, and does not support misplaced charging; the temperature monitoring method requires a lot of temperature sensors, high cost, complex equipment, and coil Q value Method, the system is complex.
  • the present invention provides a method for identifying metal foreign objects based on wireless charging technology, which includes the following steps: Step 1: Handshake and communicate with the wireless charging device, start wireless charging in the second step, and charge each step in the third step. For a period of time, perform metal foreign body detection. If there is metal foreign body, perform foreign body treatment; if there is no foreign body, continue to charge normally.
  • Step 4 Repeat steps 2 to 3, where the process of metal foreign body detection in the third step : Step S01: Stop wireless charging and start foreign object detection; Step S02; Define the driving power of the transmitting end as f 1 , define the working loss in the uncoupled state as W 1 , define the target power loss W 0 , and define the threshold value preset by the system Is W thd , step S03: obtaining the current and voltage at the transmitting end, and calculating the working loss W1 in the uncoupled state, step S04 ,: subtracting W 1 from W 0 and comparing it with W thd , if W 1- If W 0 ⁇ W thd , proceed to step S05 to indicate that there is a foreign object, perform the foreign object processing link, stop emitting energy, and give a prompt; if W1-W0 ⁇ Wthd, proceed to step Step S06 indicates that it is determined that there is no foreign matter, and the driving frequency of the adjustment system is f 1 , and the normal charging process is entered
  • the f 1 is outside the operating frequency range of the system.
  • the W thd is 1 / 9-1 / 11 of W 0 .
  • the W thd is 1/10 of W 0 .
  • the W 0 is in the case of weak coupling. If the transmitting and receiving ends are relatively close to each other, the receiving end disconnects the load and achieves the conditions of the weak coupling.
  • a temperature sensor is arranged at the transmitting end of the wireless charging device.
  • the present invention provides a method for identifying metal foreign objects based on wireless charging technology, which includes the following steps: Step 1: Handshake and communicate with the wireless charging device, start wireless charging in the second step, and charge each step in the third step. For a period of time, perform metal foreign body detection. If there is metal foreign body, perform foreign body treatment; if there is no foreign body, continue to charge normally.
  • Step 4 Repeat steps 2 to 3, where the process of metal foreign body detection in the third step : Step S01: Stop wireless charging and start foreign object detection; Step S02; Define the driving power of the transmitting end as f 1 , define the working loss in the uncoupled state as W 1 , define the target power loss W 0 , and define the threshold value preset by the system Is W thd , step S03: obtaining the current and voltage at the transmitting end, and calculating the working loss W1 in the uncoupled state, step S04 ,: subtracting W 1 from W 0 and comparing it with W thd , if W 1- If W 0 ⁇ W thd , proceed to step S05 to indicate that there is a foreign object, perform the foreign object processing link, stop emitting energy, and give a prompt; if W1-W0 ⁇ Wthd, proceed to step Step S06 indicates that it is determined that there is no foreign matter, and the driving frequency of the adjustment system is f 1 , and the normal charging process is entered
  • the f 1 is outside the operating frequency range of the system.
  • the W thd is 1 / 9-1 / 11 of W 0 .
  • the W thd is 1/10 of W 0 .
  • the W 0 is in the case of weak coupling. If the transmitting and receiving ends are relatively close to each other, the receiving end disconnects the load and achieves the conditions of the weak coupling.
  • a temperature sensor is arranged at the transmitting end of the wireless charging device.
  • Figure 1 is a schematic diagram of the charging control process.
  • FIG. 2 is a flowchart of metal foreign object detection.
  • a method for identifying a metal foreign object based on wireless charging technology includes the following steps: Step 1: shaking hands with a wireless charging device, starting wireless charging in the second step, and charging each step in the third step, Carry out metal foreign body detection, if there is metal foreign body, perform foreign body treatment; if there is no foreign body, continue to charge normally, step 4: repeat the second step to the third step.
  • Step S01 The wireless charging is stopped, foreign object detection;
  • Step S02 is: a drive power transmitting end defined as f 1, the work loss at defined non-coupling state W 1, the definition of the target
  • the power loss W 0 is defined as a preset threshold value of the system W thd .
  • Step S03 Obtain the current and voltage at the transmitting end, calculate the working loss W 1 in the uncoupled state, and step S04: combine W 1 with the target power loss W 0. Subtract and compare with W thd .
  • the target power is a built-in parameter when the system leaves the factory. Since it is only related to the transmitter, the value is relatively fixed.
  • W thd is the threshold value preset by the system.
  • the W thd is 1 / 9-1 / 11 of W 0 , preferably 1/10, if W1-W0 ⁇ Wthd, go to step S05 to determine the presence of a foreign body, perform the processing of the foreign body, stop emitting energy, and give a prompt; if W1-W0 ⁇ Wthd, go to step S06 to determine that there is no foreign body, adjust the drive frequency of the system to f1 and enter normal charging process.
  • the invention calculates its own power loss, in the case of weak coupling, the calculated power loss at the frequency f 1 is more accurate. If the transmitting and receiving ends are relatively close, then the receiving end can be disconnected according to requirements. Open load to achieve low coupling conditions.
  • the method for identifying metal foreign objects based on wireless charging technology can detect as small as the size of a paper clip according to the sensitivity of the system, but it is more sensitive, there will always be smaller metal foreign objects that cannot be detected, and small Although the metal foreign body has a small loss, its temperature can still rise to a high level and cause danger. Therefore, the transmitter of the wireless charging device is generally equipped with a temperature sensor for further assistance.
  • the invention provides a method for identifying metal foreign objects based on wireless charging technology, which does not require additional auxiliary circuits, and only needs to add certain control rules in the process of controlling charging; the method for detecting metal foreign objects has nothing to do with the receiving end, which can be very Good support for one-to-many, misplaced charging and other features.

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  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
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  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

一种基于无线充电技术的金属异物的识别方法，包括以下步骤：第一步：和被无线充电设备握手通信，第二步开始无线充电，第三步每充电一段时间，进行金属异物检测，如果有金属异物，进行异物处理；如果有不存在异物，继续正常充电，第四步：重复第二步到第三步，其中第三步中金属异物检测的过程：停止无线充电，开始异物检测；获取发射端的电流与电压，计算W1，把W1与W0进行相减，并与Wthd进行比较，如果W1-W0≥Wthd，表示判定存在异物，进行异物处理环节，停止发射能量、进行提示；如果W1-W0＜Wthd，进表示判定不存在异物，调节系统的驱动频率为f1，进入正常充电过程。该金属异物检测方法跟接收端没有关系，可以很好的支持一对多、错位充电等特性。

Description

一种基于无线充电技术的金属异物识别方法 技术领域
本发明属于无线充电领域，特别涉及到基于无线充电技术的金属异物识别方法。
 背景技术
无线充电因其无需接口的便利而开始得到广泛应用，但是由于其电磁能量耦合传递的原理决定了耦合空间内存在大功率的交变磁场，而交变磁场会使得金属等导电物品因涡流效应而发热，如果热量得不到释放而累积过高，就会引发危险。目前针对无线充电的金属异物识别主要有功率损耗效率比对法、温度监控法、线圈Q值法等。
目前功率损耗效率比对法原理是：需要在使用前测定一条合适的功率曲线，判定时使用这条曲线与工作状态进行比较，如果其超出误差阀值，判定其有异物。缺点是对产品的一致性要求非常的严格，或者其在每一款产品都要测量一条合适的功率曲线并存储大量数据或者做拟合计算；这种方法的另一个弊端是其对无线收发端不能很好的支持一对多的设备供电，因为接收端的差别会导致异物判定失败；另外，其原理决定了该设备不能很好的支持错位充电，因为错位同样会导致功率损失等充电参数改变而使得异物判定失败。
温度监控法的原理是：监测收发两端耦合空间的异常温升，如果达到一定阀值则判定有异物。该方法的缺点有：a、为了监测耦合空间的热量，需要添加温度传感器等额外装置 b、由于耦合空间比较大，为了监测大范围的温升，其可能需要添加更多的温度传感器 c、上一条缺点可以使用热红外解决，但是热红外探头需要对准目标区域、随着距离的变化其灵敏度发生变化等缺点，同时，一般收发端都使用了比较完整的坚硬的隔磁片，红外探头比较难以找到一个好的位置来监测整个空间，并且结构上会大大复杂化 d、由于其光学结构的特性，导致其很可能被异物盖住探头，如户外条件就不太方便使用这种方法。
线圈Q值法的原理是：通过添加Q值测量电路或者由本身的损耗来计算Q值，一旦空间存在金属异物，其会影响收发线圈的电感或者互感，通过对线圈Q的计算，来判定是否有异物。该方法的缺点是：a、一般为了提高灵敏度，需要添加额外的Q值检测线圈电路，增加了系统复杂度。
 技术问题
    现有常规的无线充电对金属异物的识别方法，功率损耗效率比对法不支持一对多设备供电，不支持错位充电；温度监控法需要很多的温度传感器，成本高，设备复杂，线圈Q值法，系统复杂。
 技术解决方案
为了解决以上问题，本发明提供了一种基于无线充电技术的金属异物的识别方法，包括以下步骤： 第一步：和被无线充电设备握手通信，第二步开始无线充电，第三步每充电一段时间，进行金属异物检测，如果有金属异物，进行异物处理；如果有不存在异物，继续正常充电，第四步：重复第二步到第三步，其中第三步中金属异物检测的过程：步骤S01：停止无线充电，开始异物检测；步骤S02；定义发射端的驱动功率为f 1，定义非耦合状态下的工作损耗为W 1，定义目标功率损耗W 0，定义系统预设的阀值为W thd，步骤S03：获取发射端的电流于电压，计算出非耦合状态下的工作损耗W1，步骤S04,：把W 1与W 0进行相减，并与W thd进行比较，如果W 1-W 0≥W thd，进入步骤S05表示判定存在异物，进行异物处理环节，停止发射能量、进行提示；如果W1-W0<Wthd，进入步骤S06表示判定不存在异物，调节系统的驱动频率为f 1，进入正常充电过程。
所述的f 1在系统的工作频率范围外。
所述的W thd为W 0的1/9-1/11。
所述的W thd为W 0的1/10。
所述W 0是在弱耦合情况下的，如果发收端隔得比较近，那么接收端断开负载，实现弱耦合的条件要求。
在无线充电设备的发射端配置有温度传感器。
 有益效果
为了解决以上问题，本发明提供了一种基于无线充电技术的金属异物的识别方法，包括以下步骤： 第一步：和被无线充电设备握手通信，第二步开始无线充电，第三步每充电一段时间，进行金属异物检测，如果有金属异物，进行异物处理；如果有不存在异物，继续正常充电，第四步：重复第二步到第三步，其中第三步中金属异物检测的过程：步骤S01：停止无线充电，开始异物检测；步骤S02；定义发射端的驱动功率为f 1，定义非耦合状态下的工作损耗为W 1，定义目标功率损耗W 0，定义系统预设的阀值为W thd，步骤S03：获取发射端的电流于电压，计算出非耦合状态下的工作损耗W1，步骤S04,：把W 1与W 0进行相减，并与W thd进行比较，如果W 1-W 0≥W thd，进入步骤S05表示判定存在异物，进行异物处理环节，停止发射能量、进行提示；如果W1-W0<Wthd，进入步骤S06表示判定不存在异物，调节系统的驱动频率为f 1，进入正常充电过程。
所述的f 1在系统的工作频率范围外。
所述的W thd为W 0的1/9-1/11。
所述的W thd为W 0的1/10。
所述W 0是在弱耦合情况下的，如果发收端隔得比较近，那么接收端断开负载，实现弱耦合的条件要求。
在无线充电设备的发射端配置有温度传感器。
 附图说明
图1为充电控制过程示意图。
图2为金属异物检测的流程图。
 本发明的最佳实施方式
  实施例1
给宝时德割草机器人的无线充电系统中，其是每隔15s进行一次异物检测，每次检测时间为100ms。其正常充电过程中的工作频率为80khz，在进行异物检测时其频率为20khz，调节其占空比（降低功耗）为10%，其自身损耗在无异物的情况下是1.02W，如果在充电空间放一枚硬币，其功率会变为1.1W以上，以此可以快速准确的识别一枚硬币大小的金属异物。
虽然本发明已以较佳实施例公开如上，但它们并不是用来限定本发明的，任何熟习此技艺者，在不脱离本发明之精神和范围内，自当可作各种变化或润饰，因此本发明的保护范围应当以本申请的权利要求保护范围所界定的为准。
 本发明的实施方式
下面通过附图和实施例来对本发明进行详细说明。
如图1所示，一种基于无线充电技术的金属异物的识别方法，包括以下步骤： 第一步：和被无线充电设备握手通信，第二步开始无线充电，第三步每充电一段时间，进行金属异物检测，如果有金属异物，进行异物处理；如果有不存在异物，继续正常充电，第四步：重复第二步到第三步。
如图1所示，金属异物检测的方法为：步骤S01：停止无线充电，开始异物检测；步骤S02：定义发射端的驱动功率为f 1，定义非耦合状态下的工作损耗为W 1，定义目标功率损耗W 0，定义系统预设的阀值为W thd，步骤S03: 获取发射端的电流与电压，计算其非耦合状态下的工作损耗W 1,步骤S04：把W 1与目标功率损耗W 0进行相减，并与W thd进行比较。 目标功率是在系统出厂的时候内置的一个参数，由于其仅与发射端相关，数值比较固定。该参数一般定为无异物时的功率损耗；W thd为义为系统预设的阀值，所述的W thd为W 0的1/9-1/11，优选1/10, 如果W1-W0≥Wthd，进入步骤S05表示判定存在异物，进行异物处理环节，停止发射能量、进行提示；如果W1-W0<Wthd，进入步骤S06表示判定不存在异物，调节系统的驱动频率为f1，进入正常充电过程。
本发明在计算自身功率损耗的时候，在弱耦合情况下时，那么其计算的f 1频率点的功率损耗就比较准确，如果发收端隔得比较近，那么要求其接收端可以按照要求断开负载，以实现低耦合的条件要求。
本发明提供的基于无线充电技术的金属异物的识别方法，依据系统的灵敏度可以检测到低至一枚回形针的大小，但是其再灵敏，总会有更小的金属异物无法检测出来，而小的金属异物虽然损耗小，但是其温度依然可以升到很高而发生危险。因此，无线充电设备的发射端一般配置温度传感器来做进一步的辅助。
实施例1
给宝时德割草机器人的无线充电系统中，其是每隔15s进行一次异物检测，每次检测时间为100ms。其正常充电过程中的工作频率为80khz，在进行异物检测时其频率为20khz，调节其占空比（降低功耗）为10%，其自身损耗在无异物的情况下是1.02W，如果在充电空间放一枚硬币，其功率会变为1.1W以上，以此可以快速准确的识别一枚硬币大小的金属异物。
 工业实用性
本发明提供的一种基于无线充电技术的金属异物的识别方法，不需要额外的辅助电路，只需要在控制充电过程中添加一定的控制规则；其金属异物检测方法跟接收端没有关系，可以很好的支持一对多、错位充电等特性。

Claims (7)

  1. [根据细则26更正 14.12.2018]　
    一种基于无线充电技术的金属异物的识别方法，包括以下步骤： 第一步：和被无线充电设备握手通信，第二步开始无线充电，第三步每充电一段时间，进行金属异物检测，如果有金属异物，进行异物处理；如果有不存在异物，继续正常充电，第四步：重复第二步到第三步，其中第三步中金属异物检测的过程：步骤S01：停止无线充电，开始异物检测；步骤S02；定义发射端的驱动功率为f 1，定义非耦合状态下的工作损耗为W 1，定义目标功率损耗W 0，定义系统预设的阀值为W thd，步骤S03：获取发射端的电流于电压，计算出非耦合状态下的工作损耗W1，步骤S04,：把W 1与W 0进行相减，并与W thd进行比较，如果W 1-W 0≥W thd，进入步骤S05表示判定存在异物，进行异物处理环节，停止发射能量、进行提示；如果W1-W0<Wthd，进入步骤S06表示判定不存在异物，调节系统的驱动频率为f 1，进入正常充电过程。
  2. [根据细则26更正 14.12.2018]　
    如权利要求1所述的方法，其特征在于：所述的f 1在系统的工作频率范围外。
  3. [根据细则26更正 14.12.2018]　
    如权利要求1所述的方法，其特征在于：所述的W thd为W 0的1/9-1/11。
  4. [根据细则26更正 14.12.2018]　
    如权利要求3所述的方法，其特征在于：所述的W thd为W 0的1/10。
  5. [根据细则26更正 14.12.2018]　
    如权利要求1-4任一权利要求所述的方法，其特征在于：所述W 0是在弱耦合情况下的，如果发收端隔得比较近，那么接收端断开负载，实现弱耦合的条件要求。
  6. [根据细则26更正 14.12.2018]　
    如权利要求1-4任一权利要求所述的方法，其特征在于：在无线充电设备的发射端配置有温度传感器。
  7. [根据细则26更正 14.12.2018]　
    如权利要求5所述的所述的方法，其特征在于：在无线充电设备的发射端配置有温度传感器。
PCT/CN2018/113333 2018-09-11 2018-11-01 一种基于无线充电技术的金属异物识别方法 WO2020052023A1 (zh)

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