CN108318741A - A kind of impedance detection circuit and detection method - Google Patents
A kind of impedance detection circuit and detection method Download PDFInfo
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Abstract
本发明提供了一种阻抗检测电路及检测方法，阻抗检测电路包括充电器、待充电设备、充电线缆、参考电阻及控制开关，充电器包括电压输出端和第一接地端；待充电设备包括电压输入端和第二接地端；充电线缆包括连接电压输出端和电压输入端的第一线路，以及连接第一接地端和第二接地端的第二线路，充电器、第一线路、待充电设备以及第二线路形成一充电回路；参考电阻包括串联在第一线路和/或第二线路中的至少一个电阻；控制开关包括连接在电压输入端和第二接地端之间的第一开关；在阻抗检测状态，第一开关闭合，待充电设备停止充电，通过至少一个电阻计算得到充电线缆的阻抗。通过上述检测电路可以提高阻抗检测的精度，保证阻抗检测的有效性。
The invention provides an impedance detection circuit and a detection method. The impedance detection circuit includes a charger, a device to be charged, a charging cable, a reference resistor and a control switch. The charger includes a voltage output terminal and a first ground terminal; the device to be charged includes The voltage input terminal and the second ground terminal; the charging cable includes a first circuit connecting the voltage output terminal and the voltage input terminal, and a second circuit connecting the first ground terminal and the second ground terminal, the charger, the first circuit, and the device to be charged And the second circuit forms a charging loop; the reference resistor includes at least one resistor connected in series in the first circuit and/or the second circuit; the control switch includes a first switch connected between the voltage input terminal and the second ground terminal; In the impedance detection state, the first switch is closed, the device to be charged stops charging, and the impedance of the charging cable is obtained by calculating at least one resistor. The detection circuit can improve the precision of impedance detection and ensure the effectiveness of impedance detection.
Description
技术领域technical field
本发明涉及通信技术领域，尤其涉及一种阻抗检测电路及检测方法。The invention relates to the field of communication technology, in particular to an impedance detection circuit and a detection method.
背景技术Background technique
随着移动终端功能的多样化，移动终端的待机时间逐渐变短，为了延长待机时长，终端厂商期望通过增大电池容量来延长终端待机时长。但在增大电池容量的实际过程中会产生一系列的问题，在终端厂商难以解决电池技术的情况下，快速充电方案便应运而生。With the diversification of mobile terminal functions, the standby time of the mobile terminal is gradually shortened. In order to prolong the standby time, terminal manufacturers hope to prolong the terminal standby time by increasing the battery capacity. However, in the actual process of increasing the battery capacity, a series of problems will arise. When the terminal manufacturers are difficult to solve the battery technology, the fast charging solution will emerge as the times require.
半压充电是通过对一个大电容进行充放电，最终实现对电池的大电流充电，由于不需要直流电压变换器对MOS(metal oxide semiconductor，金属氧化物半导体)管进行开通关断处理，无形中减少了开通损耗和关断损耗；因此，半压充电技术可以实现高效的快速充电。Half-voltage charging is to charge and discharge a large capacitor, and finally realize the high current charging of the battery. Since there is no need for a DC voltage converter to turn on and off the MOS (metal oxide semiconductor, metal oxide semiconductor) tube, virtually The turn-on loss and turn-off loss are reduced; therefore, the half-voltage charging technique can realize fast charging with high efficiency.
目前，半压充电输入端的电压是电池端电压的两倍，输入端的电压比较高，无形中增加了充电端口的腐蚀风险；终端厂商往往通过检测线缆的阻抗，作为判断端口是否腐蚀的方式。At present, the voltage at the input terminal of half-voltage charging is twice the voltage at the battery terminal, and the voltage at the input terminal is relatively high, which invisibly increases the corrosion risk of the charging port; terminal manufacturers often use the impedance detection of the cable as a way to judge whether the port is corroded.
目前，常用的阻抗检测方法为：获取充电器侧的检测电压V1、终端侧的检测电压V2以及充电器侧或终端侧的检测电流I。然后计算检测电压V1与检测电压V2之差与电流I的比值，即可获取阻抗值。其中，电流的取值由充电器和终端的检测精度而决定，使用检测精准那一方的电流值。但是充电器采集电压和电流的时间点和终端采集电压的时间点无法做到同时采集，采集时间的偏差会带来数据准确性的偏差，进而降低了阻抗检测的准确性。At present, the commonly used impedance detection method is: obtaining the detection voltage V1 on the charger side, the detection voltage V2 on the terminal side, and the detection current I on the charger side or the terminal side. Then calculate the ratio of the difference between the detection voltage V1 and the detection voltage V2 to the current I to obtain the impedance value. Among them, the value of the current is determined by the detection accuracy of the charger and the terminal, and the current value of the accurate detection side is used. However, the time point when the charger collects the voltage and current and the time point when the terminal collects the voltage cannot be collected at the same time. The deviation of the collection time will lead to the deviation of the data accuracy, which in turn reduces the accuracy of the impedance detection.
发明内容Contents of the invention
本发明实施例提供一种阻抗检测电路及检测方法，以解决现有技术中进行阻抗检测时，由于充电器端与待充电设备端的数据采集所存在的时间偏差，导致阻抗检测准确性降低的问题。Embodiments of the present invention provide an impedance detection circuit and detection method to solve the problem of reduced accuracy of impedance detection due to the time difference between the data collection of the charger end and the device to be charged when performing impedance detection in the prior art .
第一方面，本发明实施例提供一种阻抗检测电路，包括：充电器、待充电设备、充电线缆、参考电阻及控制开关，其中：In the first aspect, an embodiment of the present invention provides an impedance detection circuit, including: a charger, a device to be charged, a charging cable, a reference resistor, and a control switch, wherein:
充电器包括：电压输出端和第一接地端；The charger includes: a voltage output terminal and a first ground terminal;
待充电设备包括：电压输入端和第二接地端；The equipment to be charged includes: a voltage input terminal and a second ground terminal;
充电线缆包括：第一线路和第二线路，第一线路连接电压输出端和电压输入端，第二线路连接第一接地端和第二接地端，充电器、第一线路、待充电设备以及第二线路形成一充电回路；The charging cable includes: a first line and a second line, the first line is connected to the voltage output end and the voltage input end, the second line is connected to the first ground end and the second ground end, the charger, the first line, the device to be charged and The second circuit forms a charging circuit;
参考电阻包括：串联在第一线路和/或第二线路中的至少一个电阻；The reference resistor includes: at least one resistor connected in series in the first line and/or the second line;
控制开关包括：连接在电压输入端和第二接地端之间的第一开关；The control switch includes: a first switch connected between the voltage input terminal and the second ground terminal;
其中，阻抗检测电路包括充电状态和阻抗检测状态，在充电状态，第一开关断开，充电器通过充电回路为待充电设备充电；在阻抗检测状态，第一开关闭合，待充电设备停止充电，通过至少一个电阻计算得到充电线缆的阻抗。Wherein, the impedance detection circuit includes a charging state and an impedance detection state. In the charging state, the first switch is turned off, and the charger charges the device to be charged through the charging circuit; in the impedance detection state, the first switch is closed, and the device to be charged stops charging. The impedance of the charging cable is calculated by at least one resistor.
第二方面，本发明实施例还提供一种阻抗检测方法，应用于充电器，该方法包括：In the second aspect, the embodiment of the present invention also provides an impedance detection method, which is applied to a charger, and the method includes:
建立与待充电设备之间的通信连接；Establish a communication connection with the device to be charged;
在阻抗检测电路切换至阻抗检测状态时，接收待充电设备发送的阻抗检测指令；其中，阻抗检测电路包括：充电器的电压输出端和第一接地端，待充电设备的电压输入端和第二接地端，连接于充电器与待充电设备之间的充电线缆，充电线缆包括连接电压输出端和电压输入端的第一线路，连接第一接地端和第二接地端的第二线路，串联在第一线路和/或第二线路中的至少一个电阻，以及，连接在电压输入端和第二接地端之间的第一开关，且在阻抗检测状态下，第一开关闭合；When the impedance detection circuit switches to the impedance detection state, it receives the impedance detection instruction sent by the device to be charged; wherein, the impedance detection circuit includes: the voltage output terminal of the charger and the first ground terminal, the voltage input terminal of the device to be charged and the second The ground terminal is connected to the charging cable between the charger and the device to be charged. The charging cable includes a first line connecting the voltage output terminal and a voltage input terminal, and a second line connecting the first ground terminal and the second ground terminal, connected in series At least one resistor in the first line and/or the second line, and a first switch connected between the voltage input terminal and the second ground terminal, and in the impedance detection state, the first switch is closed;
获取充电器的电压输出端的输出电压和输出电流，根据输出电压、输出电流以及至少一个电阻，计算充电线缆的阻值；Obtain the output voltage and output current of the voltage output terminal of the charger, and calculate the resistance value of the charging cable according to the output voltage, output current and at least one resistor;
将计算得到的充电线缆的阻值发送至待充电设备。Send the calculated resistance value of the charging cable to the device to be charged.
第三方面，本发明实施例还提供一种阻抗检测方法，应用于待充电设备，该方法包括：In the third aspect, the embodiment of the present invention also provides an impedance detection method, which is applied to the device to be charged, and the method includes:
建立与充电器之间的通信连接；Establish a communication connection with the charger;
在阻抗检测电路切换至阻抗检测状态时，向充电器发送阻抗检测指令，由充电器根据阻抗检测指令计算充电线缆的阻值；其中，阻抗检测电路包括：充电器的电压输出端和第一接地端，待充电设备的电压输入端和第二接地端，连接于充电器与待充电设备之间的充电线缆，充电线缆包括连接电压输出端和电压输入端的第一线路，连接第一接地端和第二接地端的第二线路，串联在第一线路和/或第二线路中的至少一个电阻，以及，连接在电压输入端和第二接地端之间的第一开关，且在阻抗检测状态下，第一开关闭合；When the impedance detection circuit switches to the impedance detection state, an impedance detection command is sent to the charger, and the charger calculates the resistance value of the charging cable according to the impedance detection command; wherein, the impedance detection circuit includes: the voltage output terminal of the charger and the first The ground terminal, the voltage input terminal and the second ground terminal of the device to be charged, are connected to the charging cable between the charger and the device to be charged, the charging cable includes a first line connecting the voltage output terminal and the voltage input terminal, and is connected to the first The ground terminal and the second line of the second ground terminal, at least one resistor connected in series in the first line and/or the second line, and the first switch connected between the voltage input terminal and the second ground terminal, and between the impedance In the detection state, the first switch is closed;
接收充电器发送的至少一个充电线缆的阻值，并根据至少一个充电线缆的阻值获取充电线缆的目标阻值。The resistance value of at least one charging cable sent by the charger is received, and the target resistance value of the charging cable is obtained according to the resistance value of the at least one charging cable.
本发明技术方案，在待充电设备停止充电，阻抗检测电路处于阻抗检测状态时，检测充电器的电压输出端的输出电压和输出电流，根据输出电压、输出电流以及串联在充电器与待充电设备之间的线路中的至少一个电阻，获取充电器与待充电设备之间的充电线缆的阻抗，可以提高阻抗检测的精准度，保证阻抗检测的有效性，解决现有阻抗检测过程中由于充电器端与待充电设备端数据采集时间上的偏差，导致阻抗检测的准确性降低的问题。The technical scheme of the present invention detects the output voltage and output current of the voltage output terminal of the charger when the charging device stops charging and the impedance detection circuit is in the impedance detection state, and according to the output voltage, the output current and the voltage connected in series between the charger and the device to be charged Obtaining the impedance of the charging cable between the charger and the device to be charged can improve the accuracy of impedance detection, ensure the effectiveness of impedance detection, and solve the problem caused by the charger in the existing impedance detection process. The deviation in the data collection time between the terminal and the device to be charged leads to the problem that the accuracy of impedance detection is reduced.
附图说明Description of drawings
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
图1表示本发明实施例的阻抗检测电路示意图之一；Fig. 1 shows one of the schematic diagrams of the impedance detection circuit of the embodiment of the present invention;
图2表示本发明实施例的阻抗检测电路示意图之二；Fig. 2 shows the second schematic diagram of the impedance detection circuit of the embodiment of the present invention;
图3表示本发明实施例的阻抗检测电路示意图之三；Fig. 3 shows the third schematic diagram of the impedance detection circuit of the embodiment of the present invention;
图4表示本发明实施例的阻抗检测电路示意图之四；Fig. 4 shows the fourth schematic diagram of the impedance detection circuit of the embodiment of the present invention;
图5表示本发明实施例阻抗检测方法示意图之一；Fig. 5 shows one of the schematic diagrams of the impedance detection method of the embodiment of the present invention;
图6表示本发明实施例获取充电线缆的阻值的实施流程图之一；Fig. 6 shows one of the implementation flow charts of obtaining the resistance value of the charging cable according to the embodiment of the present invention;
图7表示本发明实施例阻抗检测方法示意图之二；Fig. 7 shows the second schematic diagram of the impedance detection method of the embodiment of the present invention;
图8表示本发明实施例获取充电线缆的阻值的实施流程图之二。Fig. 8 shows the second implementation flow chart of obtaining the resistance value of the charging cable according to the embodiment of the present invention.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
本发明实施例提供一种阻抗检测电路，如图1所示，包括：充电器1、待充电设备2、充电线缆3、参考电阻及控制开关，其中：An embodiment of the present invention provides an impedance detection circuit, as shown in FIG. 1 , including: a charger 1, a device to be charged 2, a charging cable 3, a reference resistor and a control switch, wherein:
充电器1包括：电压输出端11和第一接地端12；The charger 1 includes: a voltage output terminal 11 and a first ground terminal 12;
待充电设备2包括：电压输入端21和第二接地端22；The device 2 to be charged includes: a voltage input terminal 21 and a second ground terminal 22;
充电线缆3包括：第一线路31和第二线路32，第一线路31连接电压输出端11和电压输入端21，第二线路32连接第一接地端12和第二接地端22，充电器1、第一线路31、待充电设备2以及第二线路32形成一充电回路；The charging cable 3 includes: a first line 31 and a second line 32, the first line 31 is connected to the voltage output terminal 11 and the voltage input terminal 21, the second line 32 is connected to the first ground terminal 12 and the second ground terminal 22, and the charger 1. The first line 31, the device to be charged 2 and the second line 32 form a charging circuit;
参考电阻包括：串联在第一线路31和/或第二线路32中的至少一个电阻；The reference resistor includes: at least one resistor connected in series in the first line 31 and/or the second line 32;
控制开关包括：连接在电压输入端21和第二接地端22之间的第一开关51；The control switch includes: a first switch 51 connected between the voltage input terminal 21 and the second ground terminal 22;
其中，阻抗检测电路包括充电状态和阻抗检测状态，在充电状态，第一开关51断开，充电器1通过充电回路为待充电设备2充电；在阻抗检测状态，第一开关51闭合，待充电设备2停止充电，通过至少一个电阻计算得到充电线缆3的阻抗。Wherein, the impedance detection circuit includes a charging state and an impedance detection state. In the charging state, the first switch 51 is disconnected, and the charger 1 charges the device 2 to be charged through the charging circuit; in the impedance detection state, the first switch 51 is closed, and the charging device 2 is charged. The device 2 stops charging, and the impedance of the charging cable 3 is obtained by calculating at least one resistor.
本发明实施例提供的阻抗检测电路，包括充电器1，待充电设备2、充电线缆3、参考电阻及控制开关，充电器1包括电压输出端11和第一接地端12；待充电设备2包括：电压输入端21和第二接地端22；充电线缆3包括：第一线路31和第二线路32。电压输出端11通过第一线路31连接至电压输入端21，第一接地端12通过第二线路32连接至第二接地端22，可以使得充电器1、第一线路31、待充电设备2以及第二线路32形成一充电回路，实现充电器1为待充电设备2的供电。The impedance detection circuit provided by the embodiment of the present invention includes a charger 1, a device to be charged 2, a charging cable 3, a reference resistor and a control switch, the charger 1 includes a voltage output terminal 11 and a first ground terminal 12; the device to be charged 2 It includes: a voltage input end 21 and a second ground end 22 ; the charging cable 3 includes: a first line 31 and a second line 32 . The voltage output terminal 11 is connected to the voltage input terminal 21 through the first line 31, and the first ground terminal 12 is connected to the second ground terminal 22 through the second line 32, so that the charger 1, the first line 31, the device to be charged 2 and The second circuit 32 forms a charging circuit, realizing the power supply of the charger 1 to the device 2 to be charged.
在电压输入端21和第二接地端22之间设置有第一开关51，在进行阻抗检测时，待充电设备2通过电源管理接口芯片进行设置，不拉负载停止吸收电能，此时第一开关51处于闭合状态时，待充电设备2停止充电，可以通过串联在第一线路31和/或第二线路32中的至少一个电阻，进行充电线缆3的阻抗检测；在第一开关51处于断开状态时，充电回路可以继续工作，此时充电器1为待充电设备2进行充电。A first switch 51 is provided between the voltage input terminal 21 and the second ground terminal 22. When performing impedance detection, the device 2 to be charged is set through the power management interface chip, and stops absorbing electric energy without pulling the load. At this time, the first switch 51 When 51 is in the closed state, the charging device 2 stops charging, and the impedance detection of the charging cable 3 can be performed through at least one resistor connected in series in the first line 31 and/or the second line 32; In the open state, the charging circuit can continue to work, and the charger 1 is charging the device 2 to be charged at this time.
在本发明实施例中，如图2所示，阻抗检测电路还包括:In an embodiment of the present invention, as shown in Figure 2, the impedance detection circuit also includes:
处理芯片6，用于在阻抗检测电路处于阻抗检测状态时，采集电压输出端11的输出电压和输出电流，根据输出电压、输出电流以及至少一个电阻，计算充电线缆3的阻抗。The processing chip 6 is used to collect the output voltage and output current of the voltage output terminal 11 when the impedance detection circuit is in the impedance detection state, and calculate the impedance of the charging cable 3 according to the output voltage, output current and at least one resistance.
在第一开关51处于闭合状态，阻抗检测电路处于阻抗检测状态时，可以通过处理芯片6对电压输出端11的输出电压和输出电流进行采集，在获取电压输出端11的输出电压和输出电流之后，可以根据所获取的输出电压、输出电流以及串联于第一线路31和/或第二线路32中的至少一个电阻，计算得到充电线缆3的阻抗。When the first switch 51 is in the closed state and the impedance detection circuit is in the impedance detection state, the output voltage and output current of the voltage output terminal 11 can be collected through the processing chip 6, after obtaining the output voltage and output current of the voltage output terminal 11 , the impedance of the charging cable 3 can be calculated according to the obtained output voltage, output current and at least one resistor connected in series in the first line 31 and/or the second line 32 .
其中串联于第一线路31和/或第二线路32中的至少一个电阻的阻值为固定值，在计算充电线缆3的阻抗时，需要根据所设置的电阻的数量以及电阻之间的连接形式，采用对应的方法进行计算。下面介绍本发明实施例所提供的不同的电阻形式，以及针对不同形式的电阻所对应的计算方式。The resistance value of at least one resistor connected in series with the first line 31 and/or the second line 32 is a fixed value. When calculating the impedance of the charging cable 3, it is necessary to calculate the resistance according to the number of resistors set and the connection between the resistors. Form, use the corresponding method to calculate. The different resistance forms provided by the embodiments of the present invention and the corresponding calculation methods for different forms of resistance are introduced below.
在本发明一实施例中，如图3所示，至少一个电阻包括：第一电阻41，第一电阻41串联于电压输出端11与第一线路31之间；控制开关还包括跨接于第一电阻41两端的第二开关52；其中在阻抗检测电路处于充电状态时，第二开关52闭合；在阻抗检测电路处于阻抗检测状态时，第二开关52断开。In an embodiment of the present invention, as shown in FIG. 3 , at least one resistor includes: a first resistor 41 connected in series between the voltage output terminal 11 and the first line 31; A second switch 52 at both ends of the resistor 41; when the impedance detection circuit is in the charging state, the second switch 52 is closed; when the impedance detection circuit is in the impedance detection state, the second switch 52 is open.
至少一个电阻包括：串联于电压输出端11与第一线路31之间的第一电阻41，在第一电阻41的两端跨接一第二开关52，根据第二开关52的闭合或者断开状态控制第一电阻41的工作状态。其中第二开关52的第一端连接至电压输出端11，第二开关52的另一端连接至第一电阻41与第一线路31之间。At least one resistor includes: a first resistor 41 connected in series between the voltage output terminal 11 and the first line 31, a second switch 52 is connected across the two ends of the first resistor 41, according to the closing or opening of the second switch 52 State controls the working state of the first resistor 41 . The first terminal of the second switch 52 is connected to the voltage output terminal 11 , and the other terminal of the second switch 52 is connected between the first resistor 41 and the first line 31 .
在阻抗检测电路处于充电状态时，第一开关51处于断开状态，第二开关52处于闭合状态，此时通过第二开关52的闭合状态，可以将第一电阻41进行短路。在第一电阻41短路、第一开关51处于断开状态时，充电器通过充电回路为待充电设备充电。When the impedance detection circuit is in the charging state, the first switch 51 is in the open state, and the second switch 52 is in the closed state. At this time, the first resistor 41 can be short-circuited through the closed state of the second switch 52 . When the first resistor 41 is short-circuited and the first switch 51 is turned off, the charger charges the device to be charged through the charging circuit.
在阻抗检测电路处于阻抗检测状态时，第一开关51处于闭合状态，第二开关52处于断开状态，此时第一电阻41串联于第一线路31中正常工作，根据第一电阻41以及电压输出端的11的输出电压和输出电流，可以获取充电线缆3的阻抗。When the impedance detection circuit is in the impedance detection state, the first switch 51 is in the closed state, and the second switch 52 is in the open state. At this time, the first resistor 41 is connected in series in the first line 31 to work normally. According to the first resistor 41 and the voltage The output voltage and output current of the output terminal 11 can obtain the impedance of the charging cable 3 .
其中在根据第一电阻41以及电压输出端11的输出电压和输出电流获取充电线缆3的阻抗时，对应的计算过程为：计算电压输出端11的输出电压与输出电流的比值；根据比值与第一电阻41的阻值之差，获取充电线缆3的阻值。When obtaining the impedance of the charging cable 3 according to the output voltage and output current of the first resistor 41 and the voltage output terminal 11, the corresponding calculation process is: calculate the ratio of the output voltage of the voltage output terminal 11 to the output current; according to the ratio and The resistance value of the charging cable 3 is obtained from the difference between the resistance values of the first resistor 41 .
本发明技术方案，在待充电设备停止充电，阻抗检测电路处于阻抗检测状态时，检测充电器的电压输出端的输出电压和输出电流，根据输出电压、输出电流以及串联在充电器与待充电设备之间的线路中的第一电阻，获取充电器与待充电设备之间的充电线缆的阻抗，可以提高阻抗检测的精准度，保证阻抗检测的有效性，解决现有阻抗检测过程中由于充电器端与待充电设备端数据采集时间上的偏差，导致阻抗检测的准确性降低的问题。The technical scheme of the present invention detects the output voltage and output current of the voltage output terminal of the charger when the charging device stops charging and the impedance detection circuit is in the impedance detection state, and according to the output voltage, the output current and the voltage connected in series between the charger and the device to be charged Obtaining the impedance of the charging cable between the charger and the device to be charged can improve the accuracy of impedance detection, ensure the effectiveness of impedance detection, and solve the problem caused by the charger in the existing impedance detection process. The deviation in the data collection time between the terminal and the device to be charged leads to the problem that the accuracy of impedance detection is reduced.
在本发明另一实施例中，如图4所示，至少一个电阻包括：串联的第二电阻42和第三电阻43；In another embodiment of the present invention, as shown in FIG. 4, at least one resistor includes: a second resistor 42 and a third resistor 43 connected in series;
参考电阻还包括第四电阻44，控制开关还包括：第三开关53以及第四开关54，第三开关53与第四电阻44串联，第三开关53分别与第二电阻42的第二端以及第三电阻43的第一端连接，第二电阻42的第一端连接至电压输出端11，第二电阻42的第二端与第三电阻43的第一端连接，第四电阻44连接至第二线路32；第四开关54跨接在第二电阻42的第一端和第三电阻43的第二端之间；其中，在阻抗检测电路处于充电状态时，第四开关54闭合，第三开关53断开；在阻抗检测电路处于阻抗检测状态时，第四开关54断开，第三开关53闭合。The reference resistor also includes a fourth resistor 44, and the control switch further includes: a third switch 53 and a fourth switch 54, the third switch 53 is connected in series with the fourth resistor 44, and the third switch 53 is respectively connected to the second end of the second resistor 42 and the second end of the second resistor 42. The first end of the third resistor 43 is connected, the first end of the second resistor 42 is connected to the voltage output terminal 11, the second end of the second resistor 42 is connected to the first end of the third resistor 43, and the fourth resistor 44 is connected to The second line 32; the fourth switch 54 is connected between the first end of the second resistor 42 and the second end of the third resistor 43; wherein, when the impedance detection circuit is in the charging state, the fourth switch 54 is closed, and the fourth switch 54 is closed, The third switch 53 is turned off; when the impedance detection circuit is in the impedance detection state, the fourth switch 54 is turned off, and the third switch 53 is turned on.
至少一个电阻包括：串联的第二电阻42和第三电阻43，其中本发明所提供的参考电阻还包括：第四电阻44，控制开关还包括：第三开关53以及第四开关54。At least one resistor includes: a second resistor 42 and a third resistor 43 connected in series, wherein the reference resistor provided by the present invention further includes: a fourth resistor 44 , and the control switch further includes: a third switch 53 and a fourth switch 54 .
第二电阻42的第一端连接至电压输出端11，第二电阻42的第二端同时与第三电阻43的第一端以及第三开关53的第一端连接，第三开关53的第二端与第四电阻44的第一端连接，第四电阻44的第二端连接至第二线路32，第三电阻43的第二端连接至第一线路31。第四开关54的两端分别连接至电压输出端11以及第三电阻43与第一线路31之间。The first end of the second resistor 42 is connected to the voltage output terminal 11, the second end of the second resistor 42 is connected to the first end of the third resistor 43 and the first end of the third switch 53 at the same time, and the first end of the third switch 53 The two ends are connected to the first end of the fourth resistor 44 , the second end of the fourth resistor 44 is connected to the second line 32 , and the second end of the third resistor 43 is connected to the first line 31 . Two ends of the fourth switch 54 are respectively connected to the voltage output terminal 11 and between the third resistor 43 and the first line 31 .
在充电器通过充电回路为待充电设备充电时，第四开关54处于闭合状态，第三开关53处于断开状态，第一开关51处于断开状态，此时充电器通过充电回路可以为待充电设备充电。在需要阻抗检测电路进行阻抗检测时，待充电设备通过电源管理接口芯片进行设置，不拉负载停止吸收电能，第一开关51处于闭合状态，第四开关54处于断开状态，第三开关53处于闭合状态，通过电压输出端11的输出电压和输出电流、第二电阻42、第三电阻43以及第四电阻44，可以计算获取充电线缆3的阻值。When the charger is charging the device to be charged through the charging circuit, the fourth switch 54 is in the closed state, the third switch 53 is in the open state, and the first switch 51 is in the open state. At this time, the charger can charge the device to be charged through the charging circuit. The device is charging. When the impedance detection circuit is required for impedance detection, the device to be charged is set through the power management interface chip, and stops absorbing electric energy without pulling the load. The first switch 51 is in the closed state, the fourth switch 54 is in the open state, and the third switch 53 is in the In the closed state, the resistance value of the charging cable 3 can be calculated and obtained through the output voltage and output current of the voltage output terminal 11 , the second resistor 42 , the third resistor 43 and the fourth resistor 44 .
其中第二电阻42、第三电阻43以及第四电阻44的阻值均为已知值，在通过电压输出端11的输出电压和输出电流、第二电阻42、第三电阻43以及第四电阻44，计算充电线缆3的阻值时，对应的计算过程如下所示。The resistance values of the second resistor 42, the third resistor 43 and the fourth resistor 44 are all known values, and the output voltage and output current of the voltage output terminal 11, the second resistor 42, the third resistor 43 and the fourth resistor 44. When calculating the resistance value of the charging cable 3, the corresponding calculation process is as follows.
假设第二电阻(R1)42上对应的电流为I，第三电阻(R2)43上对应的电流为I1，第四电阻(R3)44上对应的电流为I2，第二电阻42与第三电阻43之间对应的电压为V，电压输出端11的输出电压为Vbus，充电线缆3的阻值为R，则上述电压电流之间的对应关系为：Assuming that the corresponding current on the second resistor (R1) 42 is I, the corresponding current on the third resistor (R2) 43 is I1, and the corresponding current on the fourth resistor (R3) 44 is I2, the second resistor 42 and the third resistor The corresponding voltage between the resistors 43 is V, the output voltage of the voltage output terminal 11 is V bus , and the resistance of the charging cable 3 is R, then the corresponding relationship between the above voltages and currents is:
V＝Vbus-I*R1；V＝ Vbus -I*R1;
I＝I1+I2；I=I1+I2;
I2＝V/R3；I2=V/R3;
I1(R2+R)＝I2R3；I1(R2+R)=I2R3;
则根据上述关系可以推导出充电线缆3的阻值R，其中充电线缆3的阻值可以表示为：Then according to the above relationship, the resistance R of the charging cable 3 can be deduced, wherein the resistance of the charging cable 3 can be expressed as:
至此，即可获取充电线缆3的阻抗，根据上述过程可以看出最终计算所得的阻抗，在R1，R2，R3都是固定值的情况下，只与Vbus和I相关，上述方式可以消除线缆阻抗计算时，待充电设备端采样和充电器端采样不同时引起的偏差。At this point, the impedance of the charging cable 3 can be obtained. According to the above process, it can be seen that the final calculated impedance is only related to V bus and I when R1, R2, and R3 are all fixed values. The above method can eliminate When calculating the cable impedance, the deviation caused by the difference between the sampling at the device to be charged and the sampling at the charger.
本发明技术方案，在待充电设备停止充电，阻抗检测电路处于阻抗检测状态时，检测充电器的电压输出端的输出电压和输出电流，根据输出电压、输出电流、第二电阻、第三电阻以及第四电阻，获取充电线缆的阻值，可以提高阻抗检测的精准度，保证阻抗检测的有效性，解决现有阻抗检测过程中由于充电器端与待充电设备端数据采集时间上的偏差，导致阻抗检测的准确性降低的问题。The technical solution of the present invention detects the output voltage and output current of the voltage output terminal of the charger when the charging device stops charging and the impedance detection circuit is in the impedance detection state, and according to the output voltage, output current, the second resistance, the third resistance and the first Four resistors, obtaining the resistance value of the charging cable can improve the accuracy of impedance detection, ensure the effectiveness of impedance detection, and solve the problem of data collection time deviation between the charger end and the device to be charged in the existing impedance detection process. There is a problem that the accuracy of impedance detection decreases.
本发明实施例还提供一种阻抗检测方法，应用于充电器，如图5所示，该方法包括：The embodiment of the present invention also provides an impedance detection method applied to a charger, as shown in FIG. 5 , the method includes:
步骤501、建立与待充电设备之间的通信连接。Step 501, establishing a communication connection with the device to be charged.
充电器首先需要建立与待充电设备之间的通信连接，实现与待充电设备之间的通信握手。The charger first needs to establish a communication connection with the device to be charged, and realize the communication handshake with the device to be charged.
步骤502、在阻抗检测电路切换至阻抗检测状态时，接收待充电设备发送的阻抗检测指令。Step 502, when the impedance detection circuit switches to the impedance detection state, receive an impedance detection instruction sent by the device to be charged.
在充电器与待充电设备握手成功之后，待充电设备通过电源管理接口芯片进行设置，不拉负载停止吸收电能，此时阻抗检测电路切换至阻抗检测状态，待充电设备可以向充电器发送阻抗检测指令。After the handshake between the charger and the device to be charged is successful, the device to be charged is set through the power management interface chip, and stops absorbing electric energy without pulling the load. At this time, the impedance detection circuit switches to the impedance detection state, and the device to be charged can send impedance detection to the charger. instruction.
需要说明的是，阻抗检测电路包括：充电器的电压输出端和第一接地端，待充电设备的电压输入端和第二接地端，连接于充电器与待充电设备之间的充电线缆，充电线缆包括连接电压输出端和电压输入端的第一线路，连接第一接地端和第二接地端的第二线路，串联在第一线路和/或第二线路中的至少一个电阻，以及，连接在电压输入端和第二接地端之间的第一开关，且在阻抗检测状态下，第一开关闭合。It should be noted that the impedance detection circuit includes: a voltage output terminal and a first ground terminal of the charger, a voltage input terminal and a second ground terminal of the device to be charged, a charging cable connected between the charger and the device to be charged, The charging cable includes a first line connecting the voltage output end and the voltage input end, a second line connecting the first ground end and the second ground end, at least one resistor connected in series in the first line and/or the second line, and connecting The first switch is between the voltage input terminal and the second ground terminal, and in the state of impedance detection, the first switch is closed.
接收待充电设备发送的阻抗检测指令的过程为：建立与待充电设备的通信连接，且第一开关闭合、待充电设备停止充电后，接收待充电设备发送的阻抗检测指令。The process of receiving the impedance detection instruction sent by the device to be charged is: after establishing a communication connection with the device to be charged, and after the first switch is closed and the device to be charged stops charging, the impedance detection instruction sent by the device to be charged is received.
在待充电设备通过电源管理接口芯片进行设置，不拉负载，第一开关处于闭合状态时，阻抗检测电路处于阻抗检测状态，待充电设备可以向充电器发送阻抗检测指令，充电器接收阻抗检测指令，并根据接收到的阻抗检测指令执行步骤503。When the device to be charged is set through the power management interface chip, the load is not pulled, and the first switch is in the closed state, the impedance detection circuit is in the impedance detection state, the device to be charged can send an impedance detection command to the charger, and the charger receives the impedance detection command , and execute step 503 according to the received impedance detection instruction.
步骤503、获取充电器的电压输出端的输出电压和输出电流，根据输出电压、输出电流以及至少一个电阻，计算充电线缆的阻值。Step 503: Obtain the output voltage and output current of the voltage output terminal of the charger, and calculate the resistance value of the charging cable according to the output voltage, output current and at least one resistor.
在阻抗检测状态下，根据阻抗检测电路所包含的不同电阻以及开关的情况，可以采用不同的方式进行计算。In the impedance detection state, different methods can be used for calculation according to different resistors and switches included in the impedance detection circuit.
第一种实施情况：至少一个电阻包括：第一电阻，第一电阻串联于充电输出端与第一线路之间；阻抗检测电路还包括跨接于第一电阻两端的第二开关。A first implementation situation: the at least one resistor includes: a first resistor connected in series between the charging output terminal and the first line; the impedance detection circuit further includes a second switch connected across the two ends of the first resistor.
获取充电器的电压输出端的输出电压和输出电流，根据输出电压、输出电流以及至少一个电阻，计算充电线缆的阻值的步骤，包括：在第二开关处于断开状态时，计算电压输出端的输出电压与输出电流的比值；根据比值与第一电阻的阻值之差，获取充电线缆的阻值。The step of obtaining the output voltage and output current of the voltage output terminal of the charger, and calculating the resistance value of the charging cable according to the output voltage, output current and at least one resistor includes: calculating the voltage output terminal when the second switch is in the disconnected state The ratio of the output voltage to the output current; according to the difference between the ratio and the resistance of the first resistor, the resistance of the charging cable is obtained.
在计算充电线缆的阻值时，第一开关处于闭合状态，第二开关处于断开状态，此时需要获取电压输出端的输出电压和输出电流，根据输出电压和输出电流的比值计算出对应的阻抗值。由于第一电阻串联于电压输出端与第一线路之间，在得到输出电压和输出电流的比值后，将所得比值减去第一电阻的阻值，即可得到充电线缆的阻值。When calculating the resistance of the charging cable, the first switch is in the closed state and the second switch is in the open state. At this time, it is necessary to obtain the output voltage and output current of the voltage output terminal, and calculate the corresponding Impedance value. Since the first resistor is connected in series between the voltage output terminal and the first line, after obtaining the ratio of the output voltage to the output current, the resistance of the charging cable can be obtained by subtracting the resistance of the first resistor from the obtained ratio.
需要说明的是，在阻抗检测电路处于充电状态时，第二开关闭合；在阻抗检测电路处于阻抗检测状态时，第二开关断开。It should be noted that, when the impedance detection circuit is in the charging state, the second switch is closed; when the impedance detection circuit is in the impedance detection state, the second switch is turned off.
第二种实施情况，在本发明实施例另一实施过程中，至少一个电阻包括：串联的第二电阻和第三电阻；阻抗检测电路还包括：串联的第三开关与第四电阻，以及跨接在第二电阻的第一端和第三电阻的第二端之间的第四开关，第三开关分别与第二电阻的第二端以及第三电阻的第一端连接，第二电阻的第一端连接至电压输出端，第二电阻的第二端与第三电阻的第一端连接，第四电阻连接至第二线路。In the second implementation situation, in another implementation process of the embodiment of the present invention, at least one resistor includes: a second resistor and a third resistor connected in series; the impedance detection circuit further includes: a third switch and a fourth resistor connected in series, and A fourth switch connected between the first end of the second resistor and the second end of the third resistor, the third switch is respectively connected to the second end of the second resistor and the first end of the third resistor, and the second end of the second resistor The first terminal is connected to the voltage output terminal, the second terminal of the second resistor is connected to the first terminal of the third resistor, and the fourth resistor is connected to the second circuit.
获取充电器的电压输出端的输出电压和输出电流，根据输出电压、输出电流以及至少一个电阻，计算充电线缆的阻值的步骤，包括：计算输出电压与第二电阻的阻值和输出电流乘积之间的差值，获取第一参考值；计算第一参考值与第四电阻的阻值之比，获取第二参考值；计算输出电流与第二参考值的差值，获取第三参考值；计算第一参考值与第三参考值的比值，将第一参考值与第三参考值的比值与第三电阻的阻值之差确定为充电线缆的阻值。Obtaining the output voltage and output current of the voltage output terminal of the charger, and calculating the resistance value of the charging cable according to the output voltage, output current and at least one resistor, including: calculating the product of the output voltage and the resistance value of the second resistor and the output current Calculate the difference between the first reference value and the resistance value of the fourth resistor to obtain the second reference value; calculate the difference between the output current and the second reference value to obtain the third reference value ; Calculate the ratio of the first reference value to the third reference value, and determine the difference between the ratio of the first reference value to the third reference value and the resistance of the third resistor as the resistance of the charging cable.
在阻抗检测电路处于阻抗检测状态，计算充电线缆的阻值时，第一开关处于闭合状态，第四开关断开，第三开关闭合。在阻抗检测电路处于充电状态时，第一开关断开，第四开关闭合，第三开关断开。When the impedance detection circuit is in the impedance detection state and calculating the resistance of the charging cable, the first switch is in the closed state, the fourth switch is open, and the third switch is closed. When the impedance detection circuit is in a charging state, the first switch is turned off, the fourth switch is turned on, and the third switch is turned off.
计算充电线缆的阻值时，需要获取电压输出端的输出电压和输出电流，根据输出电压、输出电流以及对应的电阻计算出充电线缆的阻抗值。When calculating the resistance value of the charging cable, it is necessary to obtain the output voltage and output current of the voltage output terminal, and calculate the impedance value of the charging cable according to the output voltage, output current and corresponding resistance.
假设第二电阻(R1)上对应的电流为I，第三电阻(R2)上对应的电流为I1，第四电阻(R3)上对应的电流为I2，第二电阻与第三电阻之间对应的电压为V，电压输出端的输出电压为Vbus，充电线缆的阻值为R，则上述电压电流之间的对应关系为：Assuming that the corresponding current on the second resistor (R1) is I, the corresponding current on the third resistor (R2) is I1, and the corresponding current on the fourth resistor (R3) is I2, the correspondence between the second resistor and the third resistor The voltage of the voltage is V, the output voltage of the voltage output terminal is V bus , and the resistance of the charging cable is R, then the corresponding relationship between the above voltage and current is:
V＝Vbus-I*R1；V＝ Vbus -I*R1;
I＝I1+I2；I=I1+I2;
I2＝V/R3；I2=V/R3;
I1(R2+R)＝I2R3；I1(R2+R)=I2R3;
则根据上述关系可以推导出充电线缆的阻值R，则在计算充电线缆的阻值R时，需要计算第二电阻的阻值和输出电流的乘积，计算输出电压与所得乘积之差，获取第一参考值。然后计算第一参考值与第四电阻的阻值之比，获取第二参考值。根据输出电流与第二参考值的差值，获取第三参考值。确定第一参考值与第三参考值的比值，计算所得比值与第三电阻的阻值的差值为充电线缆的阻值。According to the above relationship, the resistance value R of the charging cable can be deduced. When calculating the resistance value R of the charging cable, it is necessary to calculate the product of the resistance value of the second resistor and the output current, and calculate the difference between the output voltage and the obtained product. Get the first reference value. Then calculate the ratio of the first reference value to the resistance value of the fourth resistor to obtain the second reference value. A third reference value is acquired according to the difference between the output current and the second reference value. The ratio of the first reference value to the third reference value is determined, and the difference between the calculated ratio and the resistance of the third resistor is the resistance of the charging cable.
在计算完成充电线缆的阻值后，执行步骤504。After the calculation of the resistance value of the charging cable is completed, step 504 is executed.
步骤504、将计算得到的充电线缆的阻值发送至待充电设备。Step 504, sending the calculated resistance value of the charging cable to the device to be charged.
在充电器获取充电线缆的阻值之后，会将得到的阻值发送至待充电设备，待充电设备可以根据充电器所传输的至少一个阻值获取充电线缆的目标阻值。After the charger obtains the resistance value of the charging cable, it will send the obtained resistance value to the device to be charged, and the device to be charged can obtain the target resistance value of the charging cable according to at least one resistance value transmitted by the charger.
其中，在将计算得到的充电线缆的阻值发送至待充电设备后，还包括：Among them, after sending the calculated resistance value of the charging cable to the device to be charged, it also includes:
向待充电设备发送切换指令，使得待充电设备控制第一开关断开，阻抗检测电路由阻抗检测状态切换至充电状态。A switching instruction is sent to the device to be charged, so that the device to be charged controls the first switch to be turned off, and the impedance detection circuit is switched from the impedance detection state to the charging state.
将计算得到的充电线缆的阻值发送至待充电设备之后，充电器可以向待充电设备发送切换指令，待充电设备控制第一开关断开，阻抗检测电路可以切换至充电状态，其中针对第一种实施情况而言，切换至充电状态时，第一开关处于断开状态，第二开关需要处于闭合状态，通过将第二开关设置为闭合状态，可以避免第一电阻消耗能量，进而提高充电效率。After sending the calculated resistance value of the charging cable to the device to be charged, the charger can send a switching command to the device to be charged, the device to be charged controls the first switch to be turned off, and the impedance detection circuit can switch to the charging state, wherein for the second In one implementation situation, when switching to the charging state, the first switch is in the off state, and the second switch needs to be in the closed state. By setting the second switch to the closed state, energy consumption by the first resistor can be avoided, thereby improving charging. efficiency.
针对第二种实施情况而言，切换至充电状态时，第一开关处于断开状态，第三开关处于断开状态，第四开关处于闭合状态，通过将第四开关闭合、第三开关断开，可以避免第二电阻、第三电阻以及第四电阻的能量消耗，进而提高充电效率。For the second implementation situation, when switching to the charging state, the first switch is in the open state, the third switch is in the open state, and the fourth switch is in the closed state. By closing the fourth switch and opening the third switch , the energy consumption of the second resistor, the third resistor and the fourth resistor can be avoided, thereby improving the charging efficiency.
本发明实施例充电器获取充电线缆的阻值的具体实施流程如图6所示：The specific implementation process of obtaining the resistance value of the charging cable by the charger in the embodiment of the present invention is shown in Figure 6:
步骤601、建立与待充电设备的通信连接。Step 601, establishing a communication connection with the device to be charged.
步骤602、与待充电设备握手成功后，检测是否接收到阻抗检测指令，若接收到则执行步骤603，否则继续进行检测过程。Step 602 , after the handshake with the device to be charged is successful, check whether the impedance detection command is received, if so, execute step 603 , otherwise continue the detection process.
步骤603、充电器输出电压和电流，并采集输出电压和输出电流。Step 603, the charger outputs voltage and current, and collects the output voltage and current.
其中本发明实施例中以充电器输出5V电压和2A电流为例进行说明。充电器通过协议IC(integrated circuit，集成电路)芯片同时采集到电压和电流。通过充电器来完成采样，可以消除采样时间不同时的问题。In the embodiment of the present invention, the charger outputs a voltage of 5V and a current of 2A as an example for illustration. The charger simultaneously collects voltage and current through a protocol IC (integrated circuit, integrated circuit) chip. Sampling is done by the charger, which can eliminate the problem of different sampling times.
步骤604、根据采集的输出电压、输出电流以及串联于充电器与待充电设备之间的至少一个电阻，计算得到充电线缆的阻值。Step 604: Calculate the resistance value of the charging cable according to the collected output voltage, output current and at least one resistor connected in series between the charger and the device to be charged.
步骤605、将计算得到的阻值发送至待充电设备。Step 605, sending the calculated resistance value to the device to be charged.
步骤606、向待充电设备发送切换指令，使得待充电设备控制阻抗检测电路切换至充电状态。Step 606: Send a switching instruction to the device to be charged, so that the device to be charged controls the impedance detection circuit to switch to the charging state.
本发明实施例，可以提高阻抗检测的精准度，保证阻抗检测的有效性，解决现有阻抗检测过程中由于充电器端与待充电设备端数据采集时间上的偏差，导致阻抗检测的准确性降低的问题。The embodiments of the present invention can improve the accuracy of impedance detection, ensure the effectiveness of impedance detection, and solve the problem of lower accuracy of impedance detection due to the deviation in data collection time between the charger end and the device to be charged in the existing impedance detection process. The problem.
本发明实施例还提供一种阻抗检测方法，应用于待充电设备，如图7所示，该方法包括：The embodiment of the present invention also provides an impedance detection method, which is applied to the device to be charged, as shown in FIG. 7, the method includes:
步骤701、建立与充电器之间的通信连接。Step 701, establishing a communication connection with the charger.
待充电设备需要建立与充电器之间的通信连接。The device to be charged needs to establish a communication connection with the charger.
步骤702、在阻抗检测电路切换至阻抗检测状态时，向充电器发送阻抗检测指令，由充电器根据阻抗检测指令计算充电线缆的阻值。Step 702, when the impedance detection circuit switches to the impedance detection state, send an impedance detection instruction to the charger, and the charger calculates the resistance value of the charging cable according to the impedance detection instruction.
在完成通信连接之后，待充电设备通过电源管理接口芯片进行设置，不拉负载停止吸收电能，此时阻抗检测电路切换至阻抗检测状态。待充电设备可以向充电器发送阻抗检测指令，使得充电器根据阻抗检测指令计算充电线缆的阻值。After the communication connection is completed, the device to be charged is set through the power management interface chip, and stops absorbing electric energy without pulling the load. At this time, the impedance detection circuit switches to the impedance detection state. The device to be charged may send an impedance detection instruction to the charger, so that the charger calculates the resistance value of the charging cable according to the impedance detection instruction.
其中阻抗检测电路包括：充电器的电压输出端和第一接地端，待充电设备的电压输入端和第二接地端，连接于充电器与待充电设备之间的充电线缆，充电线缆包括连接电压输出端和电压输入端的第一线路，连接第一接地端和第二接地端的第二线路，串联在第一线路和/或第二线路中的至少一个电阻，以及，连接在电压输入端和第二接地端之间的第一开关，且在阻抗检测状态下，第一开关闭合。充电器利用阻抗检测电路计算充电线缆阻值的情况不在赘述。The impedance detection circuit includes: the voltage output terminal and the first ground terminal of the charger, the voltage input terminal and the second ground terminal of the device to be charged, and a charging cable connected between the charger and the device to be charged, and the charging cable includes A first line connected to the voltage output terminal and a voltage input terminal, a second line connected to the first ground terminal and the second ground terminal, at least one resistor connected in series in the first line and/or the second line, and connected to the voltage input terminal and the first switch between the second ground terminal, and in the state of impedance detection, the first switch is closed. The case where the charger uses the impedance detection circuit to calculate the resistance of the charging cable will not be described in detail.
步骤703、接收充电器发送的至少一个充电线缆的阻值，并根据至少一个充电线缆的阻值获取充电线缆的目标阻值。Step 703: Receive the resistance value of at least one charging cable sent by the charger, and obtain the target resistance value of the charging cable according to the resistance value of the at least one charging cable.
在充电器获取充电线缆的阻值之后，发送至待充电设备，待充电设备根据接收到的至少一个充电线缆的阻值获取充电线缆的目标阻值。其中根据至少一个充电线缆的阻值获取充电线缆的目标阻值时，需要计算至少一个充电线缆的阻值的平均值，确定所得平均阻值为充电线缆的目标阻值。After the charger obtains the resistance value of the charging cable, it sends it to the device to be charged, and the device to be charged obtains the target resistance value of the charging cable according to the received resistance value of at least one charging cable. When obtaining the target resistance of the charging cable according to the resistance of at least one charging cable, it is necessary to calculate the average value of the resistance of at least one charging cable, and determine the obtained average resistance as the target resistance of the charging cable.
本发明实施例待充电设备获取充电线缆的阻值的实施流程如图8所示：The implementation process of obtaining the resistance value of the charging cable by the device to be charged in the embodiment of the present invention is shown in Figure 8:
步骤801、建立与充电器的通信连接。Step 801, establishing a communication connection with the charger.
步骤802、与充电器握手成功后，通过电源管理接口芯片进行设置，不拉负载停止吸收电能，控制阻抗检测电路处于阻抗检测状态。其中步骤802可以使得充电器侧的检测不受待充电设备侧的影响。Step 802 , after the handshake with the charger is successful, the power management interface chip is used to set, stop absorbing electric energy without pulling the load, and control the impedance detection circuit to be in the impedance detection state. Wherein step 802 can make the detection on the charger side not be affected by the device to be charged side.
步骤803、向充电器发送阻抗检测指令。Step 803, sending an impedance detection command to the charger.
步骤804、接收充电器发送的至少一个充电线缆的阻值。Step 804, receiving the resistance value of at least one charging cable sent by the charger.
步骤805、计算至少一个充电线缆的阻值的平均值，获取充电线缆的目标阻值。本发明实施例中可以根据6个充电线缆的阻值计算平均值，当然还可以是其他数量，在这里不做限定。Step 805: Calculate the average value of the resistance of at least one charging cable to obtain the target resistance of the charging cable. In the embodiment of the present invention, the average value may be calculated according to the resistance values of the six charging cables, of course, other numbers may also be used, which is not limited here.
806、控制阻抗检测电路切换至充电状态。806. Control the impedance detection circuit to switch to the charging state.
通过本发明的改进，可以由充电器侧完成阻抗检测过程，消除阻抗检测时，待充电设备侧与充电器侧检测时间点不同步的问题，无形中提高了阻抗检测的精准度。Through the improvement of the present invention, the impedance detection process can be completed by the charger side, eliminating the problem of out-of-synchronization detection time points between the device to be charged and the charger side during impedance detection, and imperceptibly improving the accuracy of impedance detection.
本发明不局限于手机和充电器组成的快充系统，对于平板电脑，可穿戴设备等智能终端在和充电器进行快速充电时，需要进行线缆阻抗检测的过程也同样适用。The present invention is not limited to a fast charging system composed of a mobile phone and a charger, and is also applicable to the process of performing cable impedance detection when smart terminals such as tablet computers and wearable devices perform fast charging with a charger.
本说明书中的每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。Each embodiment in this specification focuses on the differences from other embodiments, and the same and similar parts of the various embodiments can be referred to each other.
尽管已描述了本发明实施例的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例做出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明实施例范围的所有变更和修改。Having described preferred embodiments of embodiments of the present invention, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be construed to cover the preferred embodiment and all changes and modifications which fall within the scope of the embodiments of the present invention.
最后，还需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者终端设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者终端设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者终端设备中还存在另外的相同要素。Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or terminal equipment comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements identified, or also include elements inherent in such a process, method, article, or end-equipment. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising said element.
以上所述的是本发明的优选实施方式，应当指出对于本技术领域的普通人员来说，在不脱离本发明所述的原理前提下还可以作出若干改进和润饰，这些改进和润饰也在本发明的保护范围内。What has been described above is a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can also be made without departing from the principles described in the present invention. within the scope of protection of the invention.
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| CN112213586A (en) * | 2020-10-10 | 2021-01-12 | 广州云从人工智能技术有限公司 | Equipment state detection method, system, equipment and medium |
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| CN114221400A (en) * | 2021-11-04 | 2022-03-22 | 荣耀终端有限公司 | Impedance detection method for charging cable, electronic device and power supply device |
| CN114221400B (en) * | 2021-11-04 | 2022-11-04 | 荣耀终端有限公司 | Impedance detection method for charging cable, electronic device and power supply device |
| CN114465319A (en) * | 2022-02-21 | 2022-05-10 | Oppo广东移动通信有限公司 | Electronic device, method for determining path impedance, chip, and storage medium |
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