CN108226646A - sensitive resistance measuring device and measuring method - Google Patents
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Abstract
本发明提供一种敏感电阻测量装置及测量方法，其包括MCU电路、测量电路；MCU电路包括：用于采集测量电路电压值的ADC单元，用于为测量电路供电的电源IO接口；其中，ADC单元包括：第一电压采集通道电路、第二电压采集通道电路；测量电路包括：并联连接的敏感电阻支路和标准电阻支路；其中，敏感电阻支路包括串联连接的敏感电阻RT和标准电阻R；标准电路支路包括串联连接的两个标准电阻R；第一电压采集通道电路用于采集串联连接的敏感电阻RT和标准电阻R之间串联连接点的电压值；第二电压采集通道电路用于采集串联连接的两个标准电阻R之间串联连接点的电压值。该敏感电阻测量装置可有效提高敏感电阻阻值测量的准确性。
The present invention provides a sensitive resistor measuring device and a measuring method, which include an MCU circuit and a measuring circuit; the MCU circuit includes: an ADC unit for collecting the voltage value of the measuring circuit, and a power supply IO interface for powering the measuring circuit; wherein the ADC unit includes: a first voltage collection channel circuit and a second voltage collection channel circuit; the measuring circuit includes: a sensitive resistor branch and a standard resistor branch connected in parallel; wherein the sensitive resistor branch includes a sensitive resistor RT and a standard resistor R connected in series; the standard circuit branch includes two standard resistors R connected in series; the first voltage collection channel circuit is used to collect the voltage value of the series connection point between the series-connected sensitive resistor RT and the standard resistor R; the second voltage collection channel circuit is used to collect the voltage value of the series connection point between the two series-connected standard resistors R. The sensitive resistor measuring device can effectively improve the accuracy of the sensitive resistor resistance value measurement.
Description
技术领域technical field
本发明涉及测量技术，尤其涉及一种敏感电阻测量装置及测量方法。The invention relates to measurement technology, in particular to a sensitive resistance measurement device and a measurement method.
背景技术Background technique
敏感电阻是一种对光照强度、压力、湿度和温度等模拟量敏感的特殊电阻。例如，热敏电阻是一种电阻值随温度而变化的元件，分为正温度系数热敏电阻和负温度系数热敏电阻；湿敏电阻是一种电阻值随湿度而变化的元件，将湿度转换成电信号；除了上述对温/湿度敏感的电阻，还有很多其他类型的敏感电阻。Sensitive resistors are special resistors that are sensitive to analog quantities such as light intensity, pressure, humidity, and temperature. For example, a thermistor is a component whose resistance value changes with temperature, which is divided into a positive temperature coefficient thermistor and a negative temperature coefficient thermistor; Converted into an electrical signal; In addition to the temperature/humidity sensitive resistors mentioned above, there are many other types of sensitive resistors.
现有技术中，对敏感电阻进行测量一般采用模数转换器(Analog to DigitalConverter，简称“ADC”)直接电阻分压的方案，如图1所示，敏感电阻测量装置10包括微控制单元101(Microcontroller Unit，简称“MCU”)和测量电路102。MCU101包括ADC单元1011和电源IO接口1012，其中，ADC单元1011用于采集敏感电阻RT的电信号，并将电信号转换为数字信号进行计算机显示；电源IO接口1012用于为测量电路102提供电压为Vio的电源供电。测量电路102由两个电阻构成，其中敏感电阻RT一端接地，一端与标准电阻R连接。标准电阻R一端与敏感电阻RT连接，另一端连接电源IO接口1012，通过电源IO接口1012为测量电路102供电。由图1可知，采用ADC单元1011采集敏感电阻RT一端的电压Vx，标准电阻R连接电源IO接口1012的另一端电压为Vio，根据欧姆定律可知：In the prior art, an analog-to-digital converter (Analog to Digital Converter, referred to as "ADC") is generally used to directly divide the resistance voltage to measure the sensitive resistance. As shown in FIG. 1, the sensitive resistance measuring device 10 includes a micro control unit 101 ( Microcontroller Unit, referred to as “MCU”) and a measurement circuit 102 . The MCU 101 includes an ADC unit 1011 and a power supply IO interface 1012, wherein the ADC unit 1011 is used to collect the electrical signal of the sensitive resistor RT, and converts the electrical signal into a digital signal for computer display; the power supply IO interface 1012 is used to provide voltage for the measurement circuit 102 Power supply for V io . The measuring circuit 102 is composed of two resistors, one end of the sensitive resistor RT is grounded, and the other end is connected to the standard resistor R. One end of the standard resistor R is connected to the sensitive resistor RT, and the other end is connected to the power supply IO interface 1012 to supply power to the measurement circuit 102 through the power supply IO interface 1012 . It can be seen from Fig. 1 that the voltage Vx at one end of the sensitive resistor RT is collected by the ADC unit 1011, and the voltage at the other end of the standard resistor R connected to the power supply IO interface 1012 is V io , according to Ohm's law:
(Vio-Vx)/RR＝Vx/RRT (1)(V io -V x )/R R ＝V x /R RT (1)
根据公式(1)得到：According to formula (1) get:
RRT＝Vx╳RR/(Vio-Vx) (2)R RT ＝V x ╳R R /(V io -V x ) (2)
根据公式(2)可知，影响敏感电阻RT阻值的误差影响因子包括：Vx、R和Vio，其中，对于Vio来说：电源IO接口1012输出的电压Vio除了给测量电路102供电外，还给该敏感电阻测量装置10中的其它电路模块供电，不同时间各电路模块工作状态不同，即Vio的负载是动态变化的，加上受周围干扰等影响，Vio的值会产生较大的波动，产生误差；此外，对于Vx来说：由于ADC单元1011的参考电压Vb可能存在误差，导致ADC单元1011测量到的绝对电压值Vx也可能存在误差；最后，对于R来说：标准电阻R受到生产工艺和材料的影响，也可能存在一定的误差。因此通过上述方法测量得到的敏感电阻RT的电阻值存在较大的误差。According to the formula (2), it can be seen that the error influencing factors affecting the resistance of the sensitive resistor RT include: Vx, R and V io , wherein, for V io : the voltage V io output by the power supply IO interface 1012 supplies power to the measurement circuit 102 , and also supply power to other circuit modules in the sensitive resistance measuring device 10. The working states of each circuit module are different at different times, that is, the load of V io changes dynamically, and the value of V io will be relatively large due to the influence of surrounding interference and the like. Large fluctuations generate errors; in addition, for Vx: due to the possible errors in the reference voltage V b of the ADC unit 1011, there may also be errors in the absolute voltage value V x measured by the ADC unit 1011; finally, for R : The standard resistance R is affected by the production process and materials, and there may also be certain errors. Therefore, there is a large error in the resistance value of the sensitive resistor RT measured by the above method.
若敏感电阻是温/湿度敏感电阻，则其与待测量的温/湿度参数有关；如果敏感电阻测量值存在误差，则会影响采集的温/湿度参数的精确性，因此，亟需一种能精确测量敏感电阻的电阻值的敏感电阻测量装置及测量方法，以保证温/湿度参数采集的精确性。If the sensitive resistor is a temperature/humidity sensitive resistor, it is related to the temperature/humidity parameter to be measured; if there is an error in the measured value of the sensitive resistor, it will affect the accuracy of the collected temperature/humidity parameter. A sensitive resistance measuring device and a measuring method for accurately measuring the resistance value of a sensitive resistance, so as to ensure the accuracy of temperature/humidity parameter collection.
发明内容Contents of the invention
本发明提供一种敏感电阻测量装置及测量方法，以解决现有技术中敏感电阻的阻值测量不准确、误差较大的技术问题。The invention provides a sensitive resistor measuring device and a measuring method to solve the technical problems of inaccurate and large error in the resistance measurement of the sensitive resistor in the prior art.
本发明一个方面提供一种敏感电阻测量装置，包括：One aspect of the present invention provides a sensitive resistance measuring device, comprising:
MCU电路、测量电路；MCU circuit, measurement circuit;
所述MCU电路包括：用于采集所述测量电路电压值的ADC单元，用于为所述测量电路供电的电源IO接口；其中，所述ADC单元包括：第一电压采集通道电路、第二电压采集通道电路；所述第一电压采集通道电路与所述第二电压采集通道电路的参考电压相同；The MCU circuit includes: an ADC unit for collecting the voltage value of the measurement circuit, and a power supply IO interface for supplying power to the measurement circuit; wherein, the ADC unit includes: a first voltage acquisition channel circuit, a second voltage Acquisition channel circuit; the reference voltage of the first voltage acquisition channel circuit is the same as that of the second voltage acquisition channel circuit;
所述测量电路包括：并联连接的敏感电阻支路和标准电阻支路；其中，所述敏感电阻支路包括串联连接的敏感电阻RT和标准电阻R；所述标准电路支路包括串联连接的两个标准电阻R；The measuring circuit comprises: a sensitive resistance branch and a standard resistance branch connected in parallel; wherein, the sensitive resistance branch comprises a sensitive resistance RT and a standard resistance R connected in series; the standard circuit branch comprises two series connected a standard resistance R;
所述第一电压采集通道电路用于采集所述串联连接的所述敏感电阻RT和所述标准电阻R之间串联连接点的电压值；The first voltage acquisition channel circuit is used to acquire the voltage value of the series connection point between the sensitive resistor RT and the standard resistor R connected in series;
所述第二电压采集通道电路用于采集所述串联连接的两个所述标准电阻R之间串联连接点的电压值。The second voltage acquisition channel circuit is used to acquire the voltage value of the serial connection point between the two standard resistors R connected in series.
可选的，还包括：供电支路；Optionally, it also includes: power supply branch circuit;
所述供电支路接入所述电源IO接口为所述测量电路供电的电路中；The power supply branch is connected to the circuit that the power supply IO interface supplies power to the measurement circuit;
所述供电支路包括：选择开关、电容；The power supply branch includes: a selection switch and a capacitor;
所述选择开关包括两个开关触点；第一开关触点用于连通所述电容和所述电源IO接口的电路，以使所述电源IO接口为所述电容充电；第二开关触点用于连通所述电容和所述测量电路的电路，以使所述电容为所述测量电路供电。The selection switch includes two switch contacts; the first switch contact is used to connect the circuit between the capacitor and the power supply IO interface, so that the power supply IO interface charges the capacitor; the second switch contact is used for A circuit for connecting the capacitor and the measuring circuit, so that the capacitor supplies power to the measuring circuit.
可选的，所述敏感电阻支路中的标准电阻R的一端与所述电源IO接口连接，另一端与所述敏感电阻RT和所述第一电压采集通道电路分别连接；Optionally, one end of the standard resistor R in the sensitive resistor branch is connected to the power supply IO interface, and the other end is connected to the sensitive resistor RT and the first voltage acquisition channel circuit respectively;
或者，or,
所述敏感电阻支路中的敏感电阻RT的一端与所述电源IO接口连接，另一端与所述标准电阻R和所述第一电压采集通道电路分别连接。One end of the sensitive resistor RT in the sensitive resistor branch is connected to the power supply IO interface, and the other end is respectively connected to the standard resistor R and the first voltage acquisition channel circuit.
可选的，所述敏感电阻支路中的标准电阻R的一端与所述第二开关触点连接，另一端与所述敏感电阻RT和所述第一电压采集通道电路分别连接；Optionally, one end of the standard resistor R in the sensitive resistor branch is connected to the second switch contact, and the other end is connected to the sensitive resistor RT and the first voltage acquisition channel circuit respectively;
或者，or,
所述敏感电阻支路中的敏感电阻RT的一端与所述第二开关触点连接，另一端与所述标准电阻R和所述第一电压采集通道电路分别连接。One end of the sensitive resistor RT in the sensitive resistor branch is connected to the second switch contact, and the other end is respectively connected to the standard resistor R and the first voltage acquisition channel circuit.
可选的，所述标准电阻R为定值电阻。Optionally, the standard resistor R is a fixed value resistor.
本发明另一个方面提供一种敏感电阻测量方法，所述方法使用前述的敏感电阻测量装置实施测量，包括：Another aspect of the present invention provides a sensitive resistance measurement method, the method uses the aforementioned sensitive resistance measurement device to perform measurement, including:
接收敏感电阻测量指令；Receive sensitive resistance measurement instructions;
根据所述敏感电阻测量指令，分别获取所述第一电压采集通道电路测量得到的第一电压值和所述第二电压采集通道电路测量得到的第二电压值；Acquiring the first voltage value measured by the first voltage acquisition channel circuit and the second voltage value measured by the second voltage acquisition channel circuit according to the sensitive resistance measurement instruction;
根据所述标准电阻R的阻值、所述第一电压值、所述第二电压值，确定所述敏感电阻RT的阻值。According to the resistance value of the standard resistance R, the first voltage value, and the second voltage value, the resistance value of the sensitive resistance RT is determined.
可选的，若所述敏感电阻支路中的标准电阻R的一端与所述电源IO接口连接，另一端与所述敏感电阻RT和所述第一电压采集通道电路分别连接，其中，所述敏感电阻RT一端接地；则所述第一电压值为所述敏感电阻RT两端的电压值；相应的，所述根据所述标准电阻R的阻值、所述第一电压值、所述第二电压值，确定所述敏感电阻RT的阻值，包括：Optionally, if one end of the standard resistor R in the sensitive resistor branch is connected to the power supply IO interface, and the other end is connected to the sensitive resistor RT and the first voltage acquisition channel circuit respectively, wherein the One end of the sensitive resistor RT is grounded; then the first voltage value is the voltage value at both ends of the sensitive resistor RT; correspondingly, according to the resistance value of the standard resistor R, the first voltage value, the second The voltage value determines the resistance value of the sensitive resistor RT, including:
根据RRT＝Vx╳RR/(2Vref-Vx)，确定所述敏感电阻RT的阻值；According to R RT =Vx╳R R /(2Vref-Vx), determine the resistance value of the sensitive resistor RT;
其中，所述RRT表示所述敏感电阻RT的阻值，所述Vx表示所述第一电压值，所述RR表示所述标准电阻R的阻值，所述Vref表示所述第二电压值。Wherein, the R RT represents the resistance value of the sensitive resistor RT, the Vx represents the first voltage value, the R R represents the resistance value of the standard resistance R, and the Vref represents the second voltage value.
可选的，若所述敏感电阻支路中的敏感电阻RT的一端与所述电源IO接口连接，另一端与所述标准电阻R和所述第一电压采集通道电路分别连接，其中，所述标准电阻R一端接地；则所述第一电压值为所述标准电阻R两端的电压值；相应的，所述根据所述标准电阻R的阻值、所述第一电压值、所述第二电压值，确定所述敏感电阻RT的阻值，包括：Optionally, if one end of the sensitive resistor RT in the sensitive resistor branch is connected to the power supply IO interface, and the other end is respectively connected to the standard resistor R and the first voltage acquisition channel circuit, wherein the One end of the standard resistance R is grounded; then the first voltage value is the voltage value at both ends of the standard resistance R; correspondingly, according to the resistance value of the standard resistance R, the first voltage value, the second The voltage value determines the resistance value of the sensitive resistor RT, including:
根据RRT＝(2Vref–Vx)╳RR/Vx，确定所述敏感电阻RT的阻值；According to R RT =(2Vref-Vx)╳R R /Vx, determine the resistance value of the sensitive resistor RT;
其中，所述RRT表示所述敏感电阻RT的阻值，所述Vx表示所述第一电压值，所述RR表示所述标准电阻R的阻值，所述Vref表示所述第二电压值。Wherein, the R RT represents the resistance value of the sensitive resistor RT, the Vx represents the first voltage value, the R R represents the resistance value of the standard resistance R, and the Vref represents the second voltage value.
本发明另一个方面提供一种敏感电阻测量方法，所述方法使用前述的敏感电阻测量装置实施测量，包括：Another aspect of the present invention provides a sensitive resistance measurement method, the method uses the aforementioned sensitive resistance measurement device to perform measurement, including:
接收敏感电阻测量指令；Receive sensitive resistance measurement instructions;
根据所述敏感电阻测量指令，向所述选择开关发送第一开关触点切换指令；所述第一开关触点切换指令用于使所述选择开关从所述第一开关触点切换到所述第二开关触点，以使所述电源IO接口停止向所述电容充电，所述电容向所述测量电路供电；According to the sensitive resistance measurement instruction, a first switch contact switching instruction is sent to the selection switch; the first switch contact switching instruction is used to switch the selection switch from the first switch contact to the a second switch contact, so that the power supply IO interface stops charging the capacitor, and the capacitor supplies power to the measurement circuit;
分别获取所述第一电压采集通道电路测量得到的第一电压值和所述第二电压采集通道电路测量得到的第二电压值；Respectively acquiring a first voltage value measured by the first voltage acquisition channel circuit and a second voltage value measured by the second voltage acquisition channel circuit;
根据所述标准电阻R的阻值、所述第一电压值、所述第二电压值，确定所述敏感电阻RT的阻值。According to the resistance value of the standard resistance R, the first voltage value, and the second voltage value, the resistance value of the sensitive resistance RT is determined.
可选的，所述确定所述敏感电阻RT的阻值之后，还包括：Optionally, after determining the resistance value of the sensitive resistor RT, it also includes:
向所述选择开关发送第二开关触点切换指令；所述第二开关触点切换指令用于使所述选择开关从所述第二开关触点切换到所述第一开关触点，以使所述电容与所述测量电路之间的电路断开，所述电容停止向所述测量电路供电，所述电容与所述电源IO接口之间的电路连通，所述电源IO接口向所述电容充电。Sending a second switch contact switching instruction to the selection switch; the second switch contact switching instruction is used to switch the selection switch from the second switch contact to the first switch contact, so that The circuit between the capacitor and the measurement circuit is disconnected, the capacitor stops supplying power to the measurement circuit, the capacitor is connected to the circuit between the power supply IO interface, and the power supply IO interface supplies power to the capacitor Charge.
由上述技术方案可知，本发明提供的敏感电阻测量装置及测量方法，其包括MCU电路、测量电路；MCU电路包括：用于采集测量电路电压值的ADC单元，用于为测量电路供电的电源IO接口；其中，ADC单元包括：第一电压采集通道电路、第二电压采集通道电路；测量电路包括：并联连接的敏感电阻支路和标准电阻支路；其中，敏感电阻支路包括串联连接的敏感电阻RT和标准电阻R；标准电路支路包括串联连接的两个标准电阻R；第一电压采集通道电路用于采集串联连接的敏感电阻RT和标准电阻R之间串联连接点的电压值；第二电压采集通道电路用于采集串联连接的两个标准电阻R之间串联连接点的电压值。该敏感电阻测量装置通过采集并联连接且电阻对称布局的敏感电阻支路和标准电阻支路两条支路的电压，实现两条支路的电压测量误差呈现等比例变化，从而消除了电压测量误差对敏感电阻阻值的影响，则通过本发明提供的敏感电阻测量装置测试的敏感电阻阻值的准确性较高。As can be seen from the above technical solution, the sensitive resistance measuring device and measuring method provided by the present invention include an MCU circuit and a measuring circuit; the MCU circuit includes: an ADC unit for collecting the voltage value of the measuring circuit, and a power supply IO for powering the measuring circuit Interface; wherein, the ADC unit includes: a first voltage acquisition channel circuit, a second voltage acquisition channel circuit; the measurement circuit includes: a sensitive resistance branch connected in parallel and a standard resistance branch; wherein, the sensitive resistance branch includes a series connected sensitive Resistor RT and standard resistance R; The standard circuit branch includes two standard resistances R connected in series; the first voltage acquisition channel circuit is used to collect the voltage value of the series connection point between the sensitive resistance RT and the standard resistance R connected in series; the second The two-voltage acquisition channel circuit is used to acquire the voltage value of the serial connection point between two standard resistors R connected in series. The sensitive resistance measurement device realizes that the voltage measurement error of the two branches presents an equal proportional change by collecting the voltages of the sensitive resistance branch and the standard resistance branch connected in parallel and having a symmetrical layout of the resistance, thereby eliminating the voltage measurement error For the influence on the resistance value of the sensitive resistor, the accuracy of the resistance value of the sensitive resistor tested by the sensitive resistor measuring device provided by the present invention is relatively high.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.
图1为现有技术的敏感电阻测量装置的结构示意图；Fig. 1 is the structural representation of the sensitive resistance measuring device of prior art;
图2为本发明一示例性实施例示出的敏感电阻测量装置的结构示意图；Fig. 2 is a schematic structural diagram of a sensitive resistance measuring device shown in an exemplary embodiment of the present invention;
图3为本发明另一示例性实施例示出的敏感电阻测量装置的结构示意图；Fig. 3 is a schematic structural diagram of a sensitive resistance measuring device shown in another exemplary embodiment of the present invention;
图4为本发明另一示例性实施例示出的敏感电阻测量装置的结构示意图；Fig. 4 is a schematic structural diagram of a sensitive resistance measuring device shown in another exemplary embodiment of the present invention;
图5为本发明另一示例性实施例示出的敏感电阻测量装置的结构示意图；5 is a schematic structural diagram of a sensitive resistance measuring device shown in another exemplary embodiment of the present invention;
图6为本发明一示例性实施例示出的敏感电阻测量方法；Fig. 6 is a sensitive resistance measuring method shown in an exemplary embodiment of the present invention;
图7为本发明另一示例性实施例示出的敏感电阻测量方法。Fig. 7 shows a method for measuring sensitive resistance according to another exemplary embodiment of the present invention.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚，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。In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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2为本发明一示例性实施例示出的敏感电阻测量装置的结构示意图，如图2所示，本实施例提供一种敏感电阻测量装置20，包括：MCU电路201、测量电路202；MCU电路201包括：用于采集测量电路电压值的ADC单元2011，用于为测量电路202供电的电源IO接口2012；其中，ADC单元2011包括：第一电压采集通道电路2011a、第二电压采集通道电路2011b；第一电压采集通道电路2011a与第二电压采集通道电路2011b的参考电压Vb相同；测量电路202包括：并联连接的敏感电阻支路2021和标准电阻支路2022；其中，敏感电阻支路2021包括串联连接的敏感电阻RT和标准电阻R；标准电路支路2022包括串联连接的两个标准电阻R；第一电压采集通道电路2011a用于采集串联连接的敏感电阻RT和标准电阻R之间串联连接点的电压值；第二电压采集通道电路2011b用于采集串联连接的两个标准电阻R之间串联连接点的电压值。FIG. 2 is a schematic structural diagram of a sensitive resistance measuring device shown in an exemplary embodiment of the present invention. As shown in FIG. 2 , the present embodiment provides a sensitive resistance measuring device 20, including: 201 includes: an ADC unit 2011 for collecting the voltage value of the measurement circuit, and a power supply IO interface 2012 for supplying power to the measurement circuit 202; wherein, the ADC unit 2011 includes: a first voltage acquisition channel circuit 2011a, a second voltage acquisition channel circuit 2011b The reference voltage V b of the first voltage acquisition channel circuit 2011a and the second voltage acquisition channel circuit 2011b is the same; the measurement circuit 202 includes: a sensitive resistance branch 2021 and a standard resistance branch 2022 connected in parallel; wherein, the sensitive resistance branch 2021 Including sensitive resistor RT and standard resistor R connected in series; standard circuit branch 2022 includes two standard resistors R connected in series; the first voltage acquisition channel circuit 2011a is used to collect the series connection between sensitive resistor RT and standard resistor R connected in series The voltage value of the connection point; the second voltage acquisition channel circuit 2011b is used to collect the voltage value of the series connection point between two standard resistors R connected in series.
具体的，MCU电路201其包括了用于采集测量电路202电压值的ADC单元2011和用于为测量电路202供电的电源IO接口2012。ADC单元2011中包括有两个采集电压的电路，即第一电压采集通道电路2011a和第二电压采集通道电路2011b，可以分别采集到测量电路202的两个点的电压值，向ADC单元2011的两个采集电压的电路供电的参考电压为Vb。电源IO接口2012连接测量电路202，并输出电源电压Vio为测量电路202供电。Specifically, the MCU circuit 201 includes an ADC unit 2011 for collecting the voltage value of the measurement circuit 202 and a power supply IO interface 2012 for supplying power to the measurement circuit 202 . The ADC unit 2011 includes two circuits for collecting voltages, that is, the first voltage collecting channel circuit 2011a and the second voltage collecting channel circuit 2011b, which can respectively collect the voltage values of two points of the measuring circuit 202 and send them to the ADC unit 2011 The reference voltage supplied by the two circuits for collecting voltages is V b . The power supply IO interface 2012 is connected to the measurement circuit 202 and outputs a power supply voltage V io to supply power to the measurement circuit 202 .
测量电路202，包括并联连接的敏感电阻支路2021和标准电阻支路2022。其中，敏感电阻支路2021由标准电阻R和敏感电阻RT串联组成。标准电阻R和敏感电阻RT的布局关系可以如图2所示，标准电阻R一端连接电源IO接口2012，另一端连接敏感电阻RT。敏感电阻一端接地，另一端连接标准电阻R。当然，也可以两者交换位置(如图4所示)，只要保证两者是串联的关系即可。标准电阻支路2022由两个标准电阻R串联组成，两只串联的标准电阻R一端相互连接，一个标准电阻R的另一端接地，另一个标准电阻R的另一端连接电源IO接口2012。The measurement circuit 202 includes a sensitive resistance branch 2021 and a standard resistance branch 2022 connected in parallel. Wherein, the sensitive resistor branch 2021 is composed of a standard resistor R and a sensitive resistor RT connected in series. The layout relationship between the standard resistor R and the sensitive resistor RT can be shown in FIG. 2 . One end of the standard resistor R is connected to the power supply IO interface 2012 , and the other end is connected to the sensitive resistor RT. One end of the sensitive resistor is grounded, and the other end is connected to the standard resistor R. Of course, the positions of the two can also be exchanged (as shown in FIG. 4 ), as long as the relationship between the two is guaranteed to be in series. The standard resistance branch 2022 is composed of two standard resistances R connected in series. One end of the two series standard resistances R is connected to each other, the other end of one standard resistance R is grounded, and the other end of the other standard resistance R is connected to the power supply IO interface 2012 .
敏感电阻测量装置20通过电源IO接口2012为测量电路202提供电源电压Vio，通过ADC单元2011的第一电压采集通道电路2011a采集串联连接的敏感电阻RT和标准电阻R之间串联连接点的电压值，即采集敏感电阻支路2021中敏感电阻RT与标准电阻R相互连接一端的电压Vx，通过ADC单元2011的第二电压采集通道电路2011b采集串联连接的两个标准电阻R之间串联连接点的电压值，即采集标准电阻支路2022中两只串联标准电阻R相互连接一端的电压Vref，根据欧姆定律可知：The sensitive resistance measuring device 20 provides the measuring circuit 202 with a power supply voltage V io through the power supply IO interface 2012, and collects the voltage at the series connection point between the sensitive resistance RT and the standard resistance R connected in series through the first voltage acquisition channel circuit 2011a of the ADC unit 2011 value, that is, to collect the voltage V x at the end where the sensitive resistor RT and the standard resistor R are connected to each other in the sensitive resistor branch 2021, and the second voltage acquisition channel circuit 2011b of the ADC unit 2011 collects the voltage V x connected in series between two standard resistors R connected in series The voltage value at point 2022, that is, the voltage V ref at the end where two series standard resistors R are connected to each other in the standard resistance branch 2022, can be known according to Ohm’s law:
Vio＝2╳Vref (3)V io ＝2╳V ref (3)
(2Vref-Vx)/RR＝Vx/RRT (4)(2V ref -V x )/R R ＝V x /R RT (4)
RRT＝Vx╳RR/(2Vref-Vx) (5)R RT ＝V x ╳R R /(2V ref -V x ) (5)
从公式(5)中，可以看出，影响敏感电阻RT阻值的误差影响因子包括：Vx、Vref和RR。Vref和Vx可通过ADC单元2011的第一电压采集通道电路2011a和第二电压采集通道电路2011b采集得到，为了保证标准电阻R的稳定性，标准电阻R可以选定定值电阻，且选定高精度的定制电阻，例如，精度为±0.5％或±1％的高精度定值电阻。ADC单元2011的第一电压采集通道电路2011a采集的电压Vx和第二电压采集通道电路2011b采集的Vref，两个电压值的变化会随参考电压Vb等比例变化。From the formula (5), it can be seen that the error factors affecting the resistance of the sensitive resistor RT include: V x , V ref and R R . V ref and V x can be collected by the first voltage acquisition channel circuit 2011a and the second voltage acquisition channel circuit 2011b of the ADC unit 2011. In order to ensure the stability of the standard resistance R, the standard resistance R can be selected as a fixed value resistor, and the selected Customized resistors with high precision, for example, high-precision fixed-value resistors with an accuracy of ±0.5% or ±1%. The voltage V x collected by the first voltage collection channel circuit 2011a of the ADC unit 2011 and the voltage V ref collected by the second voltage collection channel circuit 2011b , the changes of the two voltage values will change in proportion to the reference voltage V b .
具体的，如背景技术中所述，由于参考电压Vb的误差，导致ADC单元2011测量到的电压值Vx可能存在误差。但是，如图2所示结构，ADC单元2011的两个电压采集通道电路(2011a和2011b)测量时采用同一参考电压Vb，其测量误差的比例是相同的，因此，可以消除掉Vx和Vref的误差影响。举例来说，若第一电压采集通道电路2011a和第二电压采集通道电路2011b使用同一参考电压Vb，参考电压Vb上/下偏10％，则相应的，第一电压采集通道电路2011a和第二电压采集通道电路2011b测得的电压同时上/下偏10％。则根据公式(5)可知，当Vref和Vx的测量误差比例相同，假设都为等比例上偏10％，则测量出来的电压值分别为1.1Vref和1.1Vx，则敏感电阻RT的阻值为：Specifically, as described in the background, due to the error of the reference voltage V b , the voltage value V x measured by the ADC unit 2011 may have errors. However, with the structure shown in Figure 2, the two voltage acquisition channel circuits (2011a and 2011b) of the ADC unit 2011 use the same reference voltage V b for measurement, and the ratio of the measurement error is the same, therefore, V x and Error effect of V ref . For example, if the first voltage acquisition channel circuit 2011a and the second voltage acquisition channel circuit 2011b use the same reference voltage V b , and the reference voltage V b deviates 10% up/down, then correspondingly, the first voltage acquisition channel circuit 2011a and The voltage measured by the second voltage acquisition channel circuit 2011b is deviated up/down by 10% at the same time. According to formula (5), it can be seen that when the measurement error ratios of V ref and V x are the same, assuming that they are all proportionally biased upward by 10%, the measured voltage values are 1.1V ref and 1.1V x respectively, and the sensitive resistor RT The resistance value is:
RRT＝1.1Vx╳RR/(2╳1.1Vref-1.1╳Vx)＝Vx╳RR/(2Vref-Vx) (6)R RT ＝1.1V x ╳R R /(2╳1.1V ref -1.1╳V x )＝V x ╳R R /(2V ref -V x ) (6)
由公式(6)可以看出，由于Vx和Vref采用同一参考电压Vb，测量误差等比例上偏10％，因此可以消除Vx和Vref的误差影响，则敏感电阻RT的测量误差仅与标准电阻R的误差相关，由于标准电阻R为定值电阻，且若其采用高精度的定值电阻，则通过本实施例提供的敏感电阻测量装置20测试得到的敏感电阻的阻值准确性较高。It can be seen from the formula (6) that since V x and V ref use the same reference voltage V b , the measurement error is proportionally biased upward by 10%, so the error influence of V x and V ref can be eliminated, and the measurement error of the sensitive resistor RT It is only related to the error of the standard resistor R. Since the standard resistor R is a fixed-value resistor, and if it adopts a high-precision fixed-value resistor, the resistance value of the sensitive resistor obtained by the test of the sensitive resistor measuring device 20 provided by this embodiment is accurate. Sex is higher.
本实施例提供的敏感电阻测量装置，其包括MCU电路、测量电路；MCU电路包括：用于采集测量电路电压值的ADC单元，用于为测量电路供电的电源IO接口；其中，ADC单元包括：第一电压采集通道电路、第二电压采集通道电路；测量电路包括：并联连接的敏感电阻支路和标准电阻支路；其中，敏感电阻支路包括串联连接的敏感电阻RT和标准电阻R；标准电路支路包括串联连接的两个标准电阻R；第一电压采集通道电路用于采集串联连接的敏感电阻RT和标准电阻R之间串联连接点的电压值；第二电压采集通道电路用于采集串联连接的两个标准电阻R之间串联连接点的电压值。该敏感电阻测量装置通过采集并联连接且电阻对称布局的敏感电阻支路和标准电阻支路两条支路的电压，实现两条支路的电压测量误差呈现等比例变化，从而消除了电压测量误差对敏感电阻阻值的影响，则通过本实施例提供的敏感电阻测量装置测试的敏感电阻阻值的准确性较高。The sensitive resistance measurement device provided in this embodiment includes an MCU circuit and a measurement circuit; the MCU circuit includes: an ADC unit for collecting the voltage value of the measurement circuit, and a power supply IO interface for supplying power to the measurement circuit; wherein the ADC unit includes: The first voltage acquisition channel circuit, the second voltage acquisition channel circuit; the measurement circuit includes: a sensitive resistance branch connected in parallel and a standard resistance branch; wherein, the sensitive resistance branch includes a series connected sensitive resistance RT and a standard resistance R; the standard The circuit branch includes two standard resistors R connected in series; the first voltage acquisition channel circuit is used to collect the voltage value of the series connection point between the sensitive resistor RT connected in series and the standard resistor R; the second voltage acquisition channel circuit is used to collect The voltage value at the series connection point between two standard resistors R connected in series. The sensitive resistance measurement device realizes that the voltage measurement error of the two branches presents an equal proportional change by collecting the voltages of the sensitive resistance branch and the standard resistance branch connected in parallel and having a symmetrical layout of the resistance, thereby eliminating the voltage measurement error For the influence on the resistance value of the sensitive resistor, the accuracy of the resistance value of the sensitive resistor tested by the sensitive resistor measuring device provided in this embodiment is relatively high.
图3为本发明另一示例性实施例示出的敏感电阻测量装置的结构示意图，如图3所示，在图2所示实施例的基础上，还包括：供电支路203；供电支路203接入电源IO接口2012为测量电路202供电的电路中；供电支路203包括：选择开关2031、电容C；选择开关2031包括两个开关触点；第一开关触点a用于连通电容C和电源IO接口2012的电路，以使电源IO接口2012为电容C充电；第二开关触点b用于连通电容C和测量电路202的电路，以使电容C为测量电路202供电。Fig. 3 is a schematic structural diagram of a sensitive resistance measuring device shown in another exemplary embodiment of the present invention. As shown in Fig. 3, on the basis of the embodiment shown in Fig. 2, it also includes: a power supply branch 203; a power supply branch 203 Connect the power supply IO interface 2012 to the circuit that supplies power to the measurement circuit 202; the power supply branch 203 includes: a selection switch 2031 and a capacitor C; the selection switch 2031 includes two switch contacts; the first switch contact a is used to communicate with the capacitor C and The circuit of the power supply IO interface 2012, so that the power supply IO interface 2012 charges the capacitor C;
具体的，MCU电路201其包括了用于采集测量电路202电压值的ADC单元2011和用于为测量电路202供电的电源IO接口2012。ADC单元2011中包括有两个采集电压的电路，即第一电压采集通道电路2011a和第二电压采集通道电路2011b，可以分别采集到测量电路202的两个点的电压值，向ADC单元2011的两个采集电压的电路供电的参考电压为Vb。电源IO接口2012连接测量电路202，并输出电源电压Vio为测量电路202供电。Specifically, the MCU circuit 201 includes an ADC unit 2011 for collecting the voltage value of the measurement circuit 202 and a power supply IO interface 2012 for supplying power to the measurement circuit 202 . The ADC unit 2011 includes two circuits for collecting voltages, that is, the first voltage collecting channel circuit 2011a and the second voltage collecting channel circuit 2011b, which can respectively collect the voltage values of two points of the measuring circuit 202 and send them to the ADC unit 2011 The reference voltage supplied by the two circuits for collecting voltages is V b . The power supply IO interface 2012 is connected to the measurement circuit 202 and outputs a power supply voltage V io to supply power to the measurement circuit 202 .
测量电路202，包括并联连接的敏感电阻支路2021和标准电阻支路2022。其中，敏感电阻支路2021由标准电阻R和敏感电阻RT串联组成。标准电阻R和敏感电阻RT的布局关系可以如图3所示，标准电阻R一端连接选择开关2031，另一端连接敏感电阻RT。敏感电阻RT一端接地，另一端连接标准电阻R。标准电阻支路2022由两个标准电阻R串联组成，两只串联的标准电阻R一端相互连接，一个标准电阻R的另一端接地，另一个标准电阻R的另一端连接选择开关2031。The measurement circuit 202 includes a sensitive resistance branch 2021 and a standard resistance branch 2022 connected in parallel. Wherein, the sensitive resistor branch 2021 is composed of a standard resistor R and a sensitive resistor RT connected in series. The layout relationship between the standard resistor R and the sensitive resistor RT can be shown in FIG. 3 , one end of the standard resistor R is connected to the selection switch 2031 , and the other end is connected to the sensitive resistor RT. One end of the sensitive resistor RT is grounded, and the other end is connected to the standard resistor R. The standard resistance branch 2022 is composed of two standard resistances R connected in series. One end of the two series standard resistances R is connected to each other, the other end of one standard resistance R is grounded, and the other end of the other standard resistance R is connected to the selection switch 2031 .
供电支路203包括：选择开关2031和电容C；选择开关2031包括两个开关触点；可选择连接电源IO接口2012的开关触点a，也可选择连接敏感电阻支路2021和标准电阻支路2022并联的开关触点b。当选择开关2031连接开关触点a时，通过电源IO接口2012对电容C进行充电；当选择开关2031连接开关触点b时，电容C开始放电，为敏感电阻支路2021和标准电阻支路2022供电。当敏感电阻测量装置20处于空闲状态时，选择开关2031连接开关触点a，通过电源IO接口2012为电容C充电，存储电能；当唤醒敏感电阻测量装置20进行敏感电阻RT电阻值测量时，则选择开关2031连接开关触点b，电容C开始放电，为测量电路202供电，开始采集Vref和Vx的电压值。因此，图3所示的敏感电阻测量装置20除了可以获得准确性高的敏感电阻的电阻值，还可以在不进行测量时对电容C进行充电，执行测量时停止对电容C进行充电，从而具有功耗低的优点，同时，因为为测量电路202供电的为电容C而不是电源IO接口2012输出的电源电压Vio，从而使得电源电压Vio所受到的负载波动的影响不会波及到测量电路202，从而进一步保证了敏感电阻RT电阻值测量的准确性。The power supply branch 203 includes: a selection switch 2031 and a capacitor C; the selection switch 2031 includes two switch contacts; the switch contact a of the power supply IO interface 2012 can be selected to be connected, and the sensitive resistance branch 2021 and the standard resistance branch can also be selected to be connected 2022 parallel switch contacts b. When the selector switch 2031 is connected to the switch contact a, the capacitor C is charged through the power supply IO interface 2012; when the selector switch 2031 is connected to the switch contact b, the capacitor C starts to discharge, which is the sensitive resistance branch 2021 and the standard resistance branch 2022 powered by. When the sensitive resistance measuring device 20 is in an idle state, the selection switch 2031 is connected to the switch contact a, and the capacitor C is charged through the power supply IO interface 2012 to store electric energy; when the sensitive resistance measuring device 20 is awakened to measure the resistance value of the sensitive resistance RT, then The selection switch 2031 is connected to the switch contact b, the capacitor C starts to discharge, supplies power to the measurement circuit 202, and starts to collect the voltage values of V ref and V x . Therefore, in addition to obtaining the resistance value of the sensitive resistor with high accuracy, the sensitive resistance measuring device 20 shown in FIG. The advantage of low power consumption, at the same time, because the power supply for the measurement circuit 202 is the capacitor C instead of the power supply voltage V io output by the power supply IO interface 2012, so that the influence of the load fluctuation on the power supply voltage V io will not affect the measurement circuit 202, thereby further ensuring the accuracy of the resistance value measurement of the sensitive resistor RT.
图3所示的敏感电阻测量装置20，其工作过程为：通过电容C放电为测量电路202提供电源电压Vio，通过ADC单元2011的第一电压采集通道电路2011a采集敏感电阻支路2021中敏感电阻RT与标准电阻R连接一端的电压Vx，通过ADC单元2011的第二电压采集通道电路2011b采集标准电阻支路2022中两只串联电阻相互连接一端的电压为Vref，ADC单元2011的两个电压采集通道实施测量时采用同一参考电压Vb，其测量的误差比例是相同的，可以消除Vx和Vref的误差影响，则敏感电阻RT的测量误差仅与标准电阻R的误差相关，由于标准电阻R可以采用高精度的定值电阻，则通过本实施例提供的敏感电阻测量装置20测试的敏感电阻RT阻值的精度较高。其中，敏感电阻RT的阻值计算方法与图2所示的敏感电阻测量装置20相同，当第一电压采集通道电路2011a和第二电压采集通道电路2011b使用同一参考电压Vb，参考电压Vb上/下偏10％，则相应的，第一电压采集通道电路2011a和第二电压采集通道电路2011b测得的电压同时上/下偏10％。则根据公式(5)可知，当Vref和Vx的测量误差比例相同，假设都为等比例上偏10％，则测量出来的电压值分别为1.1Vref和1.1Vx，则敏感电阻RT的阻值为：The sensitive resistance measurement device 20 shown in FIG. 3 , its working process is: provide the power supply voltage V io for the measurement circuit 202 through the discharge of the capacitor C, and collect the sensitive resistance in the sensitive resistance branch 2021 through the first voltage acquisition channel circuit 2011a of the ADC unit 2011. The voltage V x at one end connected to the resistance RT and the standard resistance R is collected by the second voltage acquisition channel circuit 2011b of the ADC unit 2011, and the voltage at the end connected with the two series resistances in the standard resistance branch 2022 is V ref . The same reference voltage V b is used for the measurement of two voltage acquisition channels, and the error ratio of the measurement is the same, which can eliminate the error influence of V x and V ref , then the measurement error of the sensitive resistor RT is only related to the error of the standard resistor R, Since the standard resistor R can be a high-precision fixed-value resistor, the resistance value of the sensitive resistor RT tested by the sensitive resistor measuring device 20 provided in this embodiment has high precision. Wherein, the resistance calculation method of the sensitive resistor RT is the same as that of the sensitive resistor measuring device 20 shown in FIG. If it is biased downward by 10%, correspondingly, the voltages measured by the first voltage acquisition channel circuit 2011a and the second voltage acquisition channel circuit 2011b will deviate upwards/downwards by 10% at the same time. According to formula (5), it can be seen that when the measurement error ratios of V ref and V x are the same, assuming that they are all proportionally biased upward by 10%, the measured voltage values are 1.1V ref and 1.1V x respectively, and the sensitive resistor RT The resistance value is:
RRT＝1.1Vx╳RR/(2╳1.1Vref-1.1╳Vx)＝Vx╳RR/(2Vref-Vx) (6)R RT ＝1.1V x ╳R R /(2╳1.1V ref -1.1╳V x )＝V x ╳R R /(2V ref -V x ) (6)
由公式(6)可以看出，由于Vx和Vref采用同一参考电压Vb，测量误差等比例上偏10％，因此可以消除Vx和Vref的误差影响，则敏感电阻RT的测量误差仅与标准电阻R的误差相关，由于标准电阻R为定值电阻，且若其采用高精度的定值电阻，则通过本实施例提供的敏感电阻测量装置20测试得到的敏感电阻的阻值准确性较高。同时，供电支路203还提供不进行测量时对电容C充电，测量时停止对电容C充电的功能，具有功耗低优点；并且由于采用电容C替代电源IO接口2012向测量电路202供电，使得电源电压Vio所受到的负载波动的影响不会波及到测量电路202，进一步保证了敏感电阻RT电阻值测量的精确性。It can be seen from the formula (6) that since V x and V ref use the same reference voltage V b , the measurement error is proportionally biased upward by 10%, so the error influence of V x and V ref can be eliminated, and the measurement error of the sensitive resistor RT It is only related to the error of the standard resistor R. Since the standard resistor R is a fixed-value resistor, and if it adopts a high-precision fixed-value resistor, the resistance value of the sensitive resistor obtained by the test of the sensitive resistor measuring device 20 provided by this embodiment is accurate. Sex is higher. At the same time, the power supply branch 203 also provides the function of charging the capacitor C when not measuring, and stopping the charging of the capacitor C during measurement, which has the advantage of low power consumption; The impact of the load fluctuation on the power supply voltage V io will not affect the measurement circuit 202 , which further ensures the accuracy of the resistance value measurement of the sensitive resistor RT.
图4为本发明另一示例性实施例示出的敏感电阻测量装置的结构示意图，如图4所示，其在图2所示实施例的基础上，将敏感电阻支路2021中的标准电阻R与标准电阻R的位置调换。也就是说，图2所示的敏感电阻测量装置20中，敏感电阻支路2021中的标准电阻R的一端与电源IO接口2012连接，另一端与敏感电阻RT和第一电压采集通道电路2011a分别连接；图4所示的敏感电阻测量装置20中，敏感电阻支路2021中的敏感电阻RT的一端与电源IO接口2012连接，另一端与标准电阻R和第一电压采集通道电路2011a分别连接。Fig. 4 is a schematic structural diagram of a sensitive resistance measuring device shown in another exemplary embodiment of the present invention. As shown in Fig. 4, on the basis of the embodiment shown in Fig. 2, the standard resistance R in the sensitive resistance branch 2021 is The position of the standard resistor R is exchanged. That is to say, in the sensitive resistance measuring device 20 shown in FIG. 2, one end of the standard resistance R in the sensitive resistance branch 2021 is connected to the power supply IO interface 2012, and the other end is connected to the sensitive resistance RT and the first voltage acquisition channel circuit 2011a respectively. Connection; in the sensitive resistance measuring device 20 shown in FIG. 4, one end of the sensitive resistance RT in the sensitive resistance branch 2021 is connected to the power supply IO interface 2012, and the other end is connected to the standard resistance R and the first voltage acquisition channel circuit 2011a respectively.
具体的，本实施例所提供的敏感电阻测量装置20与图2所提供的敏感电阻测量装置20的区别之处在于，敏感电阻支路2021的标准电阻R和敏感电阻RT的位置不同，敏感电阻RT一端连接电源IO接口2012，另一端连接标准电阻R。标准电阻R一端接地，另一端连接敏感电阻RT。Specifically, the difference between the sensitive resistance measuring device 20 provided in this embodiment and the sensitive resistance measuring device 20 provided in FIG. 2 is that the positions of the standard resistance R and the sensitive resistance RT of the sensitive resistance branch 2021 are different, One end of RT is connected to the power supply IO interface 2012, and the other end is connected to a standard resistor R. One end of the standard resistor R is grounded, and the other end is connected to the sensitive resistor RT.
由图4所示，通过电源IO接口2012为测量电路202提供电源电压Vio，通过ADC单元2011的第一电压采集通道电路2011a采集敏感电阻支路2021中敏感电阻RT与标准电阻R连接一端的电压Vx，通过ADC单元2011的第二电压采集通道电路2011b采集标准电阻支路2022中两只串联电阻R相互连接一端的电压为Vref，根据欧姆定律可知：As shown in FIG. 4 , the power supply IO interface 2012 provides the power supply voltage V io for the measurement circuit 202, and the first voltage acquisition channel circuit 2011a of the ADC unit 2011 collects the voltage of the sensitive resistance RT connected to the standard resistance R in the sensitive resistance branch 2021. The voltage Vx is collected by the second voltage acquisition channel circuit 2011b of the ADC unit 2011. The voltage at one end of the two series resistors R connected to each other in the standard resistance branch 2022 is Vref. According to Ohm’s law:
Vio＝2╳Vref (7)V io ＝2╳V ref (7)
(2Vref-Vx)/RRT＝Vx/RR (8)(2V ref -V x )/R RT ＝V x /R R (8)
RRT＝(2Vref–Vx)╳RR/Vx (9)R RT ＝(2V ref –V x )╳R R /V x (9)
由于参考电压Vb的误差，ADC单元2011测量的电压值可能存在误差。ADC单元2011的两个电压采集通道测量时采用同一参考电压Vb，其测量的误差比例是相同的，可以消除Vx和Vref的误差影响。例如第一电压采集通道电路2011a和第二电压采集通道电路2011b使用同一参考电压Vb，参考电压Vb上/下偏10％，则第一电压采集通道电路2011a和第二电压采集通道电路2011b测得的电压同时上/下偏10％。根据公式(9)可知，当Vx和Vref的误差比例相同，假设都为等比例上偏10％，则测量出来的电压值分别为1.1Vref和1.1Vx，则敏感电阻RT的阻值RRT为：Due to the error of the reference voltage Vb , the voltage value measured by the ADC unit 2011 may have errors. The two voltage acquisition channels of the ADC unit 2011 use the same reference voltage V b for measurement, and the measurement error ratios are the same, which can eliminate the error influence of V x and V ref . For example, the first voltage acquisition channel circuit 2011a and the second voltage acquisition channel circuit 2011b use the same reference voltage Vb , and the reference voltage Vb is biased upward/downward by 10%, then the first voltage acquisition channel circuit 2011a and the second voltage acquisition channel circuit 2011b The measured voltage is biased up/down by 10% at the same time. According to the formula (9), we can know that when the error ratio of V x and V ref is the same, assuming that they are all proportionally biased up by 10%, the measured voltage values are 1.1V ref and 1.1V x respectively, and the resistance of the sensitive resistor RT The value R RT is:
RT＝(2╳1.1╳Vref–1.1Vx)╳R/1.1Vx＝(2Vref–Vx)╳R/Vx (10)RT＝(2╳1.1╳Vref–1.1Vx)╳R/1.1Vx＝(2Vref–Vx)╳R/Vx (10)
由公式(10)可以看出，由于Vx和Vref采用同一参考电压Vb，测量误差等比例上偏10％，因此可以消除Vx和Vref的误差的影响，则敏感电阻RT的测量误差仅与标准电阻R的误差相关，标准电阻R可以采用定值电阻，更优选的，采用高精度的定值电阻，则通过本实施例提供的敏感电阻测量装置20测试的敏感电阻RT阻值的精度较高。It can be seen from the formula (10) that since V x and V ref adopt the same reference voltage V b , the measurement error is proportionally biased upward by 10%, so the influence of the error of V x and V ref can be eliminated, and the measurement of the sensitive resistance RT The error is only related to the error of the standard resistance R. The standard resistance R can be a fixed-value resistor. More preferably, a high-precision fixed-value resistor is used. The resistance value of the sensitive resistor RT tested by the sensitive resistor measuring device 20 provided in this embodiment is The accuracy is higher.
图5为本发明另一示例性实施例示出的敏感电阻测量装置的结构示意图，如图5所示，其在图3所示实施例的基础上，将敏感电阻支路2021中的标准电阻R与标准电阻R的位置调换。也就是说，图3所示的敏感电阻测量装置20中，敏感电阻支路2021中的标准电阻R的一端与第二开关触点b连接，另一端与敏感电阻RT和第一电压采集通道电路2011a分别连接；图5所示的敏感电阻测量装置20中，敏感电阻支路2021中的敏感电阻RT的一端与第二开关触点b连接，另一端与标准电阻R和第一电压采集通道电路2011a分别连接。Fig. 5 is a schematic structural diagram of a sensitive resistance measuring device shown in another exemplary embodiment of the present invention. As shown in Fig. 5, on the basis of the embodiment shown in Fig. 3, the standard resistance R in the sensitive resistance branch 2021 is The position of the standard resistor R is exchanged. That is to say, in the sensitive resistance measuring device 20 shown in FIG. 3 , one end of the standard resistance R in the sensitive resistance branch 2021 is connected to the second switch contact b, and the other end is connected to the sensitive resistance RT and the first voltage acquisition channel circuit 2011a are respectively connected; in the sensitive resistance measuring device 20 shown in Figure 5, one end of the sensitive resistance RT in the sensitive resistance branch 2021 is connected with the second switch contact b, and the other end is connected with the standard resistance R and the first voltage acquisition channel circuit 2011a connected separately.
具体的，本实施例所提供的敏感电阻测量装置20与图3所提供的敏感电阻测量装置20的区别之处在于，敏感电阻支路2021的标准电阻R和敏感电阻RT的位置不同，敏感电阻RT一端连接选择开关2031，另一端连接标准电阻R。标准电阻R一端接地，另一端连接敏感电阻RT。其中，敏感电阻RT的阻值计算方法与图4所示的敏感电阻测量装置20相同，第一电压采集通道电路2011a和第二电压采集通道电路2011b使用同一参考电压Vb，参考电压Vb上/下偏10％，则第一电压采集通道电路2011a和第二电压采集通道电路2011b测得的电压同时上/下偏10％。根据公式(9)可知，当Vx和Vref的误差比例相同，假设都为等比例上偏10％，则测量出来的电压值分别为1.1Vref和1.1Vx，则敏感电阻RT的阻值RRT为：Specifically, the difference between the sensitive resistance measuring device 20 provided in this embodiment and the sensitive resistance measuring device 20 provided in FIG. One end of RT is connected to the selection switch 2031, and the other end is connected to the standard resistor R. One end of the standard resistor R is grounded, and the other end is connected to the sensitive resistor RT. Wherein, the calculation method of the resistance value of the sensitive resistor RT is the same as that of the sensitive resistor measuring device 20 shown in FIG. If / is biased downward by 10%, then the voltages measured by the first voltage acquisition channel circuit 2011a and the second voltage acquisition channel circuit 2011b will deviate upward/downward by 10% at the same time. According to the formula (9), we can know that when the error ratio of V x and V ref is the same, assuming that they are all proportionally biased up by 10%, the measured voltage values are 1.1V ref and 1.1V x respectively, and the resistance of the sensitive resistor RT The value R RT is:
RT＝(2╳1.1╳Vref–1.1Vx)╳R/1.1Vx＝(2Vref–Vx)╳R/Vx (10)RT＝(2╳1.1╳Vref–1.1Vx)╳R/1.1Vx＝(2Vref–Vx)╳R/Vx (10)
由公式(10)可以看出，由于Vx和Vref采用同一参考电压Vb，测量误差等比例上偏10％，因此可以消除Vx和Vref的误差的影响，则敏感电阻RT的测量误差仅与标准电阻R的误差相关，标准电阻R可以采用定值电阻，更优选的，采用高精度的定值电阻，则通过本实施例提供的敏感电阻测量装置20测试的敏感电阻RT阻值的精度较高。It can be seen from the formula (10) that since V x and V ref adopt the same reference voltage V b , the measurement error is proportionally biased upward by 10%, so the influence of the error of V x and V ref can be eliminated, and the measurement of the sensitive resistance RT The error is only related to the error of the standard resistance R. The standard resistance R can be a fixed-value resistor. More preferably, a high-precision fixed-value resistor is used. The resistance value of the sensitive resistor RT tested by the sensitive resistor measuring device 20 provided in this embodiment is The accuracy is higher.
图6为本发明一示例性实施例示出的敏感电阻测量方法，如图6所示，本实施例的敏感电阻测量方法可以基于图2或图4所示的敏感电阻测量装置20实施测量，该测量方法具体包括：Fig. 6 is a sensitive resistance measuring method shown in an exemplary embodiment of the present invention. As shown in Fig. 6, the sensitive resistance measuring method of this embodiment can be measured based on the sensitive resistance measuring device 20 shown in Fig. 2 or Fig. 4 , which Measurement methods specifically include:
步骤601、接收敏感电阻测量指令。Step 601, receiving a sensitive resistance measurement instruction.
步骤602、根据敏感电阻测量指令，分别获取第一电压采集通道电路测量得到的第一电压值和第二电压采集通道电路测量得到的第二电压值。Step 602: Acquire the first voltage value measured by the first voltage acquisition channel circuit and the second voltage value measured by the second voltage acquisition channel circuit according to the sensitive resistance measurement instruction.
步骤603、根据标准电阻R的阻值、第一电压值、第二电压值，确定敏感电阻RT的阻值。Step 603: Determine the resistance value of the sensitive resistor RT according to the resistance value of the standard resistance R, the first voltage value, and the second voltage value.
具体的，用于接收该敏感电阻测量指令的处理器可以是集成在MCU电路201中的处理器，也可以是该敏感电阻测量装置20外部的处理器，其与MCU电路201保持通讯交互，以使MCU电路201根据该处理器的指令执行对应的操作，例如，处理器接收到敏感电阻测量指令后，触发该MCU电路201向测量电路202供电，以使ADC单元2011采集敏感电阻支路2021和标准电阻支路2022的电压以获得敏感电阻RT的阻值。Specifically, the processor used to receive the sensitive resistance measurement instruction may be a processor integrated in the MCU circuit 201, or a processor outside the sensitive resistance measurement device 20, which maintains communication and interaction with the MCU circuit 201 to Make the MCU circuit 201 perform corresponding operations according to the instruction of the processor, for example, after the processor receives the sensitive resistance measurement instruction, trigger the MCU circuit 201 to supply power to the measurement circuit 202, so that the ADC unit 2011 collects the sensitive resistance branch 2021 and The voltage of the standard resistor branch 2022 is used to obtain the resistance value of the sensitive resistor RT.
基于图2所示的敏感电阻测量装置，即，若敏感电阻支路2021中的标准电阻R的一端与电源IO接口2012连接，另一端与敏感电阻RT和第一电压采集通道电路2011a分别连接，其中，敏感电阻RT一端接地；则第一电压值为敏感电阻RT两端的电压值；则相应的，步骤603中根据标准电阻R的阻值、第一电压值、第二电压值，确定敏感电阻RT的阻值具体包括：Based on the sensitive resistance measuring device shown in FIG. 2, that is, if one end of the standard resistance R in the sensitive resistance branch 2021 is connected to the power supply IO interface 2012, and the other end is connected to the sensitive resistance RT and the first voltage acquisition channel circuit 2011a respectively, Wherein, one end of the sensitive resistor RT is grounded; then the first voltage value is the voltage value at both ends of the sensitive resistor RT; correspondingly, in step 603, the sensitive resistor is determined according to the resistance value, the first voltage value, and the second voltage value of the standard resistor R The resistance value of RT specifically includes:
根据RRT＝Vx╳RR/(2Vref-Vx)，确定敏感电阻RT的阻值；其中，RRT表示敏感电阻RT的阻值，Vx表示第一电压值，RR表示标准电阻R的阻值，Vref表示第二电压值。According to R RT = Vx╳R R /(2Vref-Vx), determine the resistance value of the sensitive resistor RT; where, R RT represents the resistance value of the sensitive resistor RT, Vx represents the first voltage value, R R represents the resistance of the standard resistance R value, Vref represents the second voltage value.
基于图4所示的敏感电阻测量装置，即，若敏感电阻支路2021中的敏感电阻RT的一端与电源IO接口2012连接，另一端与标准电阻R和第一电压采集通道电路2011a分别连接，其中，标准电阻R一端接地；则第一电压值为标准电阻R两端的电压值；则相应的，步骤603中根据标准电阻R的阻值、第一电压值、第二电压值，确定敏感电阻RT的阻值具体包括：Based on the sensitive resistance measuring device shown in FIG. 4, that is, if one end of the sensitive resistance RT in the sensitive resistance branch 2021 is connected to the power supply IO interface 2012, and the other end is connected to the standard resistance R and the first voltage acquisition channel circuit 2011a respectively, Wherein, one end of the standard resistor R is grounded; then the first voltage value is the voltage value at both ends of the standard resistor R; correspondingly, in step 603, the sensitive resistor is determined according to the resistance value, the first voltage value, and the second voltage value of the standard resistor R The resistance value of RT specifically includes:
根据RRT＝(2Vref–Vx)╳RR/Vx，确定敏感电阻RT的阻值；其中，RRT表示敏感电阻RT的阻值，Vx表示第一电压值，RR表示标准电阻R的阻值，Vref表示第二电压值。According to R RT = (2Vref–Vx)╳R R /Vx, determine the resistance value of the sensitive resistor RT; wherein, R RT represents the resistance value of the sensitive resistor RT, Vx represents the first voltage value, R R represents the resistance of the standard resistance R value, Vref represents the second voltage value.
本实施例的敏感电阻测量方法，基于敏感电阻测量装置，该装置包括MCU电路、测量电路；MCU电路包括：用于采集测量电路电压值的ADC单元，用于为测量电路供电的电源IO接口；其中，ADC单元包括：第一电压采集通道电路、第二电压采集通道电路；测量电路包括：并联连接的敏感电阻支路和标准电阻支路；其中，敏感电阻支路包括串联连接的敏感电阻RT和标准电阻R；标准电路支路包括串联连接的两个标准电阻R；第一电压采集通道电路用于采集串联连接的敏感电阻RT和标准电阻R之间串联连接点的电压值；第二电压采集通道电路用于采集串联连接的两个标准电阻R之间串联连接点的电压值。通过上述装置，分别获取到第一电压采集通道电路测量得到的第一电压值和第二电压采集通道电路测量得到的第二电压值，由于敏感电阻支路和标准电阻支路的并联结构，且两个支路的电阻对称分布，使得两个电压值的电压测量误差呈现等比例变化，从而消除了电压测量误差对敏感电阻阻值的影响，使得基于本实施例的敏感电阻测量装置测试得到的敏感电阻阻值的准确性提升。The sensitive resistance measurement method of the present embodiment is based on a sensitive resistance measurement device, the device includes an MCU circuit and a measurement circuit; the MCU circuit includes: an ADC unit for collecting the voltage value of the measurement circuit, and a power supply IO interface for supplying power to the measurement circuit; Wherein, the ADC unit includes: a first voltage acquisition channel circuit, a second voltage acquisition channel circuit; the measurement circuit includes: a sensitive resistance branch connected in parallel and a standard resistance branch; wherein, the sensitive resistance branch includes a series connected sensitive resistance RT and standard resistor R; the standard circuit branch includes two standard resistors R connected in series; the first voltage acquisition channel circuit is used to collect the voltage value of the series connection point between the sensitive resistor RT connected in series and the standard resistor R; the second voltage The acquisition channel circuit is used to acquire the voltage value of the series connection point between two standard resistors R connected in series. Through the above device, the first voltage value measured by the first voltage acquisition channel circuit and the second voltage value measured by the second voltage acquisition channel circuit are obtained respectively, due to the parallel structure of the sensitive resistance branch and the standard resistance branch, and The symmetrical distribution of the resistances of the two branches makes the voltage measurement errors of the two voltage values change in equal proportions, thereby eliminating the influence of the voltage measurement errors on the resistance of the sensitive resistor, so that the measured value obtained based on the sensitive resistance measuring device of this embodiment The accuracy of the resistance value of the sensitive resistor is improved.
图7为本发明另一示例性实施例示出的敏感电阻测量方法，如图7所示，本实施例的敏感电阻测量方法可以基于图3或图5所示的敏感电阻测量装置20实施测量，该测量方法具体包括：FIG. 7 is a sensitive resistance measurement method shown in another exemplary embodiment of the present invention. As shown in FIG. 7 , the sensitive resistance measurement method of this embodiment can be measured based on the sensitive resistance measurement device 20 shown in FIG. 3 or FIG. 5 , Specifically, the measurement method includes:
步骤701、接收敏感电阻测量指令。Step 701, receiving a sensitive resistance measurement instruction.
步骤702、根据敏感电阻测量指令，向选择开关发送第一开关触点切换指令；第一开关触点切换指令用于使选择开关从第一开关触点切换到第二开关触点，以使电源IO接口停止向电容充电，电容向测量电路供电。Step 702, according to the sensitive resistance measurement command, send the first switch contact switching command to the selector switch; the first switch contact switch command is used to switch the selector switch from the first switch contact to the second switch contact, so that the power supply The IO interface stops charging the capacitor, and the capacitor supplies power to the measurement circuit.
步骤703、分别获取第一电压采集通道电路测量得到的第一电压值和第二电压采集通道电路测量得到的第二电压值。Step 703: Obtain the first voltage value measured by the first voltage acquisition channel circuit and the second voltage value measured by the second voltage acquisition channel circuit respectively.
步骤704、根据标准电阻R的阻值、第一电压值、第二电压值，确定敏感电阻RT的阻值。Step 704: Determine the resistance value of the sensitive resistor RT according to the resistance value of the standard resistance R, the first voltage value, and the second voltage value.
具体的，同上一实施例，用于接收敏感电阻测量指令的处理器可以是集成在MCU电路201中的处理器，也可以是该敏感电阻测量装置20外部的处理器，其与MCU电路201保持通讯交互，以使MCU电路201根据该处理器的指令执行对应的操作，例如，处理器接收到敏感电阻测量指令后，触发该MCU电路201向选择开关2031发送第一开关触点切换指令，以使选择开关2031从第一开关触点a切换到第二开关触点b，使得该敏感电阻测量装置20从空闲状态转换为工作状态，所谓空闲状态就是第一开关触点a闭合时，电源IO接口2012向电容C充电，存储电能的状态；所谓工作状态就是第二开关触点b闭合时，电源IO接口2012停止向电容C充电，电容C放电为测量电路202供电的状态；该敏感电阻测量装置20在工作状态下，执行对敏感电阻RT的阻值的测量，以确定敏感电阻RT的阻值。在确定了敏感电阻RT的阻值之后，还可以向选择开关发送第二开关触点切换指令；该第二开关触点切换指令用于使选择开关2031从第二开关触点b切换到第一开关触点a，以使电容C与测量电路202之间的电路断开，电容C停止向测量电路202供电，电容C与电源IO接口2012之间的电路连通，电源IO接口2012向电容C充电。Specifically, as in the previous embodiment, the processor used to receive the sensitive resistance measurement instruction may be a processor integrated in the MCU circuit 201, or a processor outside the sensitive resistance measurement device 20, which is maintained with the MCU circuit 201. Communication interaction, so that the MCU circuit 201 performs corresponding operations according to the instruction of the processor. For example, after the processor receives the sensitive resistance measurement instruction, it triggers the MCU circuit 201 to send the first switch contact switching instruction to the selection switch 2031 to The selector switch 2031 is switched from the first switch contact a to the second switch contact b, so that the sensitive resistance measuring device 20 is converted from the idle state to the working state. The so-called idle state is that when the first switch contact a is closed, the power supply 10 The interface 2012 charges the capacitor C to store electric energy; the so-called working state is when the second switch contact b is closed, the power supply IO interface 2012 stops charging the capacitor C, and the capacitor C discharges to supply power to the measurement circuit 202; the sensitive resistance measurement In the working state, the device 20 measures the resistance of the sensitive resistor RT to determine the resistance of the sensitive resistor RT. After the resistance value of the sensitive resistor RT is determined, a second switch contact switching instruction can also be sent to the selection switch; the second switch contact switching instruction is used to switch the selection switch 2031 from the second switch contact b to the first Switch contact a to disconnect the circuit between the capacitor C and the measurement circuit 202, the capacitor C stops supplying power to the measurement circuit 202, the circuit between the capacitor C and the power supply IO interface 2012 is connected, and the power supply IO interface 2012 charges the capacitor C .
基于图3所示的敏感电阻测量装置，即，若敏感电阻支路2021中的标准电阻R的一端与第二开关触点b连接，另一端与敏感电阻RT和第一电压采集通道电路2011a分别连接，其中，敏感电阻RT一端接地；则第一电压值为敏感电阻RT两端的电压值；则相应的，步骤704中根据标准电阻R的阻值、第一电压值、第二电压值，确定敏感电阻RT的阻值具体包括：根据RRT＝Vx╳RR/(2Vref-Vx)，确定敏感电阻RT的阻值；其中，RRT表示敏感电阻RT的阻值，Vx表示第一电压值，RR表示标准电阻R的阻值，Vref表示第二电压值。Based on the sensitive resistance measurement device shown in Figure 3, that is, if one end of the standard resistance R in the sensitive resistance branch 2021 is connected to the second switch contact b, the other end is connected to the sensitive resistance RT and the first voltage acquisition channel circuit 2011a respectively connection, wherein, one end of the sensitive resistor RT is grounded; then the first voltage value is the voltage value at both ends of the sensitive resistor RT; The resistance value of the sensitive resistor RT specifically includes: according to R RT = Vx╳R R /(2Vref-Vx), determine the resistance value of the sensitive resistor RT; wherein, R RT represents the resistance value of the sensitive resistor RT, and Vx represents the first voltage value , RR represents the resistance value of the standard resistor R, and Vref represents the second voltage value.
基于图5所示的敏感电阻测量装置，即，若敏感电阻支路2021中的敏感电阻RT的一端与第二开关触点b连接，另一端与标准电阻R和第一电压采集通道电路2011a分别连接，其中，标准电阻R一端接地；则第一电压值为标准电阻R两端的电压值；则相应的，步骤704中根据标准电阻R的阻值、第一电压值、第二电压值，确定敏感电阻RT的阻值具体包括：根据RRT＝(2Vref–Vx)╳RR/Vx，确定敏感电阻RT的阻值；其中，RRT表示敏感电阻RT的阻值，Vx表示第一电压值，RR表示标准电阻R的阻值，Vref表示第二电压值。Based on the sensitive resistance measuring device shown in Figure 5, that is, if one end of the sensitive resistance RT in the sensitive resistance branch 2021 is connected to the second switch contact b, the other end is connected to the standard resistance R and the first voltage acquisition channel circuit 2011a respectively connection, wherein, one end of the standard resistance R is grounded; then the first voltage value is the voltage value at both ends of the standard resistance R; The resistance value of the sensitive resistor RT specifically includes: according to R RT = (2Vref-Vx)╳R R /Vx, determine the resistance value of the sensitive resistor RT; wherein, R RT represents the resistance value of the sensitive resistor RT, and Vx represents the first voltage value , RR represents the resistance value of the standard resistor R, and Vref represents the second voltage value.
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
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| CN113589045B (en) | 2024-09-20 |
| CN108226646B (en) | 2022-02-22 |
| CN113589045A (en) | 2021-11-02 |
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