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Numéro de publicationCN102269775 A
Type de publicationDemande
Numéro de demandeCN 201110125578
Date de publication7 déc. 2011
Date de dépôt16 mai 2011
Date de priorité16 mai 2011
Numéro de publication201110125578.6, CN 102269775 A, CN 102269775A, CN 201110125578, CN-A-102269775, CN102269775 A, CN102269775A, CN201110125578, CN201110125578.6
Inventeurs钟小梅
Déposant钟小梅
Exporter la citationBiBTeX, EndNote, RefMan
Liens externes:  SIPO, Espacenet
一种低成本高精度的电压测量系统及其测量方法 A low-cost high-precision voltage measurement system and measurement methods Langue du texte original : Chinois
CN 102269775 A
Résumé  Langue du texte original : Chinois
一种低成本高精度的电压测量系统及其测量方法,包括开关切换电路、信号处理电路、处理器和显示模块,开关切换电路的输入端接测量电压和至少一个标准电压模块,开关切换电路的输出通过信号处理电路接处理器,处理器的控制信号输出端与开关切换电路相连,处理器通过显示模块输出测量结果。 A low-cost high-precision voltage measurement system and measurement method, comprising the switching circuit, a signal processing circuit, and a display processor input module, the switching circuit termination voltage measurement module and at least one standard voltage, the switching circuit output, a processor and a control signal output by the switching circuit is connected to a signal processing circuit connected to the processor, the processor outputs the measurement results through the display module. 本发明中,只要信号处理电路的线性度误差足够小,测量电压的误差就只与标准电压模块相关,从理论上消除了信号处理电路,如放大电路、A/D转换器等所带来的误差,达到了只需要使用低成本的信号处理电路就能实现高精度测量电压的目的;本发明中所需要的标准电压模块,在测量电路中都是作为A/D转换器的基准电压输入而现存的,本发明无须再为该模块增加成本。 The present invention, as long as the linearity error signal processing circuit is sufficiently small, the error is only measured voltage and the standard voltage module associated, theoretically eliminate the signal processing circuit, amplifier circuit, A / D converter or the like caused by error, to achieve the purpose only need to use low-cost signal processing circuit can realize high-precision measurement voltage; standard voltage module of the present invention is required, as in the measuring circuit are A / D converter's reference voltage input existing, the present invention without further increasing the cost for the module.
Revendications(10)  Langue du texte original : Chinois
1. 一种低成本高精度的电压测量系统,其特征是它包括开关切换电路、信号处理电路、 处理器和显示模块,所述的开关切换电路的输入端接测量电压和至少一个标准电压模块, 开关切换电路的输出端接信号处理电路的信号输入端,信号处理电路的信号输出端与处理器相连,处理器的控制信号输出端与开关切换电路相连,处理器与显示模块相连,显示模块作为电压测量系统的信号输出,显示测量结果。 A low-cost high-precision voltage measurement system, characterized in that it comprises a switching circuit, a signal processing circuit, a processor and a display module, said switching input terminal voltage measurement circuit and at least one standard voltage module , the signal input terminal of the switching circuit of the output termination signal processing circuit, signal processing circuit and a signal output terminal coupled to the processor, the processor of the control signal output terminal of the switching circuit is connected, is connected to the processor and display module, the display module As the signal output voltage measurement system, display the measurement results.
2.根据权利要求1所述的低成本高精度的电压测量系统,其特征是所述的开关切换电路包括与测量电压和标准电压模块相连的多个开关,各开关的一端分别连接测量电压和标准电压模块,各开关的另一端并接,与信号处理电路的信号输入端相连。 2. A low-cost high-precision voltage measurement system as claimed in claim 1, characterized in that said switching circuit includes a plurality of switches and the measured voltage and the standard voltage connected to the module, one end of each switch are connected to measure voltage and standard voltage module, and the other end of each switch contact connected to the signal input of the signal processing circuit.
3.根据权利要求1所述的低成本高精度的电压测量系统,其特征是所述的开关是模拟开关或继电器的触点开关,所有的开关由处理器控制打开或闭合。 The low-cost high-precision voltage measurement system as claimed in claim 1, wherein said switch is an analog switch or relay contact switch, all controlled by the processor switches to open or close.
4.根据权利要求1所述的低成本高精度的电压测量系统,其特征是所述的测量电压为一个或多个。 4. The low-cost high-precision voltage measurement system as claimed in claim 1, wherein said one or more measuring voltage.
5.根据权利要求1所述的低成本高精度的电压测量系统,其特征是所述的信号处理电路的为A/D转换器。 The low-cost high-precision voltage measurement system as claimed in claim 1, characterized in that the A / D converter of the signal processing circuit.
6.根据权利要求5所述的低成本高精度的电压测量系统,其特征是所述的信号处理电路还包括放大器、衰减电路和滤波器。 High accuracy at low cost according to claim 5, wherein the voltage measurement system, wherein said signal processing circuit further includes an amplifier, the attenuation circuits and filters.
7. 一种低成本高精度的电压测量方法,应用如权利要求1所述的低成本高精度的电压测量系统,其特征是它包括以下三种处理方法:(a)、当信号处理电路的线性度误差满足测量精度的要求时,采用两个标准电压模块;处理器控制开关切换电路,将信号处理电路的输入电压χ依次切换为标准电压1和标准电压2,处理器读出各输入电压对应的信号处理电路的输出结果y,并代入线性传输方程y = kx + b;处理器解出信号处理电路的传输系数k和信号处理电路的零点偏移b,然后切换至测量电压,读出对应测量电压经信号处理电路后的输出结果y,根据以上步骤得到的传输方程和处理结果y,处理器得到测量电压值;(b)、当信号处理电路的线性度误差满足测量精度的要求时,且信号处理电路的零点偏移b或者传输系数k已知,采用一个标准电压模块;处理器控制开关切换电路,将信号处理电路的输入电压χ切换为标准电压1,处理器读出经过信号处理电路的输出结果y,并代入线性传输方程:y = kx + b,根据已知的零点偏移b或者传输系数k解出传输系数k或者零点偏移b ;然后切换至测量电压,读出对应测量电压经信号处理电路后的输出结果y,根据以上步骤得到的传输方程和处理结果y,处理器得到测量电压值;(C)、当信号处理电路的线性度误差超出测量精度的要求时,采用多个标准电压模块;处理器控制开关切换电路,将信号处理电路的输入电压χ依次切换到所有的标准电压模块和测量电压,读出它们经过信号处理电路的输出结果y,根据它们的y判断出离测量电压最近的比测量电压大的标准电压模块和离测量电压最近的比测量电压小的标准电压模块,根据这两个标准电压模块的电压χ和它们经过信号处理电路的输出结果y,代入线性传输方程y = kx + b;解出传输系数k和零点偏移b,然后根据测量电压经信号处理电路后的输出结果y计算出测量电压值。 A low-cost high-precision voltage measuring method, a low-cost high-precision voltage measurement system according to claim applications, characterized in that it comprises the following three processing methods: (a), when the signal processing circuit When the linearity error measurement accuracy meet the requirements, the use of two standard voltage modules; a processor controlling the switching circuit, the input voltage χ signal processing circuit 1 are sequentially switched to the standard voltage and the standard voltage 2, the processor reads the respective input voltages The output y corresponding signal processing circuit, and into the linear transfer equation y = kx + b; processor solved transmission coefficient k and the signal processing circuit signal processing circuit zero offset b, and then switch to measure the voltage readout When (b), when the linearity of the signal processing circuit to satisfy the requirement of measurement error; corresponding to the measured voltage by the signal processing circuit after the output y, and the result of the processing according to the transmission equation y obtained in the above step, the processor to obtain measured voltage value and zero offset b or transmission coefficient k of the signal processing circuit is known, using a standard voltage module; processor control switching circuit, the input voltage χ signal processing circuit 1 is switched to the standard voltage, the processor reads out via the signal processing circuit output y, and substituting the linear transfer equation: y = kx + b, b according to the known zero offset or transmission coefficient k solve transmission coefficient k or zero offset b; then switch to measure the voltage readout corresponding to the measured voltage by the signal processing circuit after the output y, and the result of the processing according to the transmission equation y obtained in the above step, the processor to obtain the measured voltage value; (C), when the linear error signal processing circuit outside the measurement accuracy requirements , using a plurality of standard voltage modules; a processor controlling the switching circuit, the input voltage χ signal processing circuit sequentially switched to all standard voltage module and measuring the voltage, which is read out through the signal processing circuit outputs y, depending on their y is determined that the measured voltage from the measured voltage is greater than the nearest standard voltage module from the measured voltage and the nearest smaller than the voltage of the standard voltage measurement module, according to the voltage χ these two modules and their standard voltage output through the signal processing circuit y, into the linear transport equation y = kx + b; solve transmission coefficient k and the offset b, and then calculate the value based on the measured voltage by measuring the voltage output of the signal processing circuit after y.
8.根据权利要求7所述的低成本高精度的电压测量方法,其特征是所述的方法a中,标准电压1和标准电压2设为待测量电压的上、下限或接近上、下限的电压值。 8. A low-cost high-precision voltage measuring method according to claim 7, wherein said method a, the standard voltage is set to 1 and the standard voltage to be measured voltage 2, close to the upper limit or lower limit of voltage value.
9.根据权利要求7所述的低成本高精度的电压测量方法,其特征是所述的方法b中,如果信号处理电路的传输系数k已知,则标准电压模块设置为测量电压输入的下限或接近下限的电压值;如果信号处理电路的零点偏移b已知,则标准电压模块设置为测量电压输入的上限或接近上限的电压值;当下限为零电压时,直接将信号地作为标准零电压。 9. A low-cost high-precision voltage measuring method according to claim 7, characterized in that the method b, if the transmission coefficient k of the signal processing circuit is known, the standard voltage input module is configured to measure voltage lower limit or close to the lower limit voltage value; the signal processing circuit if the zero offset b is known, the standard voltage module arranged to measure an upper limit voltage or near the upper limit of the input voltage value; when the lower bound of zero voltage, directly to the signal as a standard zero voltage.
10.根据权利要求7所述的低成本高精度的电压测量方法,其特征是所述的方法c中, 多个标准电压模块为多个独立的标准电压模块或者由一个标准电压模块和电阻衰减网络构成,所述的一个标准电压模块经电阻衰减网络产生多个标准电压。 7 according to low-cost high-precision voltage measuring method according to claim, characterized in that the method c, a plurality of modules for a plurality of standard voltage of the standard voltage independent module or attenuated by the voltage module and a standard resistor network of the module via a standard voltage attenuation resistor network produces more than the standard voltage.
Description  Langue du texte original : Chinois

一种低成本高精度的电压测量系统及其测量方法 A low-cost high-precision voltage measurement system and measurement methods

技术领域 FIELD

[0001] 本发明涉及一种测量方法,尤其是是一种利用在线校准法,根据输入端的标准电压校准测量电压的系统及方法,具体地说是一种低成本高精度的电压测量方法及采用该方法的测量系统。 [0001] The present invention relates to a measuring method, in particular, is a use line calibration method, according to the system and method of calibrating standard voltage input terminal of the voltage measurement, in particular to a low-cost and high-precision voltage measuring method using measuring system of the method.

[0002] [0002]

背景技术 BACKGROUND

[0003] 目前,绝大部分用于测量各种物理量的仪表,都是通过各种传感器先将需要测量的信号转化为电压信号,再通过对该电压信号的测量,得出实际测量物理量的值,因此对电压信号测量的准确性就直接决定了所测量的物理量值的准确性。 [0003] Currently, most of the instruments for measuring various physical quantities, the first signal conversion is to be measured by various sensors into a voltage signal, and then by measuring the voltage signal, the actual value of the derived physical measurement and therefore the accuracy of the measured voltage signal directly determines the accuracy of the measurement of the physical magnitude.

[0004] 传统的测量方法都是通过对传感器输出的电压信号进行处理(放大、衰减以及滤波等)后,得到符合A/D转换器(模拟/数字信号转换器)输入范围的电压值,再由A/D转换器输出电压的读数,并经过运算得到所测量的物理量的实际值;在此过程中,放大电路、A/D 转换器等都会给信号的测量带来误差,而且随着测量环境温度的变化,这些误差也会变化; 为了提高测量结果的准确性,必须使用高质量的信号处理电路(如高精密、低温漂的电阻、 运算放大器,以及高质量的A/D转换器等)来降低测量误差,而且不管使用多么精密的、价格多么昂贵的处理电路,误差或多或少总会存在,从理论上无法完全消除该误差。 [0004] The traditional method of measurement of the voltage through the sensor output signal processing (amplification, attenuation, and filtering) obtained after compliance with A / D converter (analog / digital signal converter) value of the input voltage range, and then by the A / D converter output voltage readings and obtained through the operation of the measured actual value of the physical quantity; In this procedure, the amplifier circuit, A / D converters and so will result in errors of the measurement signal, and with the measurement ambient temperature changes, these errors will change; in order to improve the accuracy of the measurement results, you must use high-quality signal processing circuit (such as high-precision, low temperature drift of resistance, operational amplifiers, and high-quality A / D converters, etc. ) to reduce the measurement error, and no matter how sophisticated, how expensive the price of the processing circuit, there will always be more or less error, the error can not be completely eliminated from the theory.

发明内容 SUMMARY

[0005] 本发明的目的是针对仪表在测量物理量的过程中,为了提高精度,必须采用价格昂贵的、高精度、低温漂的信号处理电路,而且就算如此也无法完全消除误差的问题,提出一种低成本高精度的电压测量系统及其测量方法。 Objective [0005] The present invention is directed to the instrument during the measurement of physical quantities, in order to improve the precision, must use expensive, high-precision, low temperature drift of the signal processing circuit, and even if so, it can not completely eliminate the problem of error, make a kinds of low-cost high-precision voltage measurement system and its measurement methods. 利用在线校准法,根据输入端的标准电压校准测量电压,从理论上完全消除了信号处理电路所引入的误差,以达到用低成本的电路实现高精度测量的目的。 Use line calibration method, the calibration measurement according to the standard voltage input terminal of the voltage, theoretically completely eliminate the error introduced by the signal processing circuit, in order to achieve a low cost to achieve the purpose of high-precision measurement circuits.

[0006] 本发明的技术方案: [0006] aspect of the present invention:

一种低成本高精度的电压测量系统,它包括开关切换电路、信号处理电路、处理器和显示模块,所述的开关切换电路的输入端接测量电压和至少一个标准电压模块,开关切换电路的输出端接信号处理电路的信号输入端,信号处理电路的信号输出端与处理器相连,处理器的控制信号输出端与开关切换电路相连,处理器与显示模块相连,显示模块作为电压测量系统的信号输出,显示测量结果。 A low-cost high-precision voltage measurement system, which includes the switching circuit, a signal processing circuit, the processor and the display module, the input of the switching circuit of the termination voltage measurement module and at least one standard voltage, the switching circuit output termination signal processing circuit signal input terminal, a signal output terminal of the signal processing circuit is connected to the processor, the control processor and the signal output terminal is connected to the switching circuit, connected to the processor and display module, the display module as a voltage measurement system signal output, display the measurement results.

[0007] 本发明的开关切换电路包括与测量电压和标准电压模块相连的多个开关,各开关的一端分别连接测量电压和标准电压模块,各开关的另一端并接,与信号处理电路的信号输入端相连。 [0007] The switch of the present invention, the switching circuit includes a plurality of switches and the measured voltage and the standard voltage connected to the module, one end of each switch are connected to measure voltage and standard voltage module, and the other end of each switch connected to the signal processing circuit of the signal connected to the input.

[0008] 本发明的开关是模拟开关或继电器的触点开关,所有的开关由处理器控制打开或闭合。 [0008] The present invention is a switch analog switch or relay contact switch, all controlled by the processor switches to open or close.

[0009] 本发明的测量电压为一个或多个。 [0009] The present invention is a measured voltage of one or more. [0010] 本发明的信号处理电路的为A/D转换器。 [0010] The signal processing circuit of the present invention is A / D converter.

[0011] 本发明的信号处理电路还包括放大器、衰减电路和滤波器。 The signal processing circuit [0011] The present invention further includes an amplifier, the attenuation circuits and filters.

[0012] 一种低成本高精度的电压测量方法,应用低成本高精度的电压测量系统,它包括以下三种处理方法: [0012] A low-cost high-precision voltage measuring method, the application of low-cost high-precision voltage measurement system, which includes the following three processing methods:

(a)、当信号处理电路的线性度误差满足测量精度的要求时,采用两个标准电压模块; 处理器控制开关切换电路,将信号处理电路的输入电压χ依次切换为标准电压1和标 (A), when the linear error signal processing circuit satisfies the requirements of the measurement accuracy, the use of two standard voltage modules; a processor controlling the switching circuit, the input voltage χ signal processing circuit sequentially switching the standard voltage and the subscript 1

准电压2,处理器读出各输入电压对应的信号处理电路的输出结果y,并代入线性传输方程y = kx + b ;处理器解出信号处理电路的传输系数k和信号处理电路的零点偏移b,然后切换至测量电压,读出对应测量电压经信号处理电路后的输出结果y,根据以上步骤得到的传输方程和处理结果y,处理器得到测量电压值; 2 reference voltage, the processor reads the output voltage corresponding to each input signal processing circuit y, and substituting the linear transfer equation y = kx + b; processor solved transmission coefficient k and the signal processing circuit signal processing circuit zero bias shift b, then switch to measure voltage, read out by measuring the voltage corresponding to the signal processing circuit after the output y, according to the transmission equation and the results obtained in the above step y, the processor be measured voltage value;

(b)、当信号处理电路的线性度误差满足测量精度的要求时,且信号处理电路的零点偏移b或者传输系数k已知,采用一个标准电压模块; (B), when the linearity of the signal processing circuit to meet the requirement of measurement error, and zero offset b or transmission coefficient k known signal processing circuit, using a standard voltage module;

处理器控制开关切换电路,将信号处理电路的输入电压χ切换为标准电压1,处理器读出经过信号处理电路的输出结果y,并代入线性传输方程:y = kx + b,根据已知的零点偏移b或者传输系数k解出传输系数k或者零点偏移b ;然后切换至测量电压,读出对应测量电压经信号处理电路后的输出结果y,根据以上步骤得到的传输方程和处理结果y,处理器得到测量电压值; Processor control switching circuit, the input voltage χ signal processing circuit 1 is switched to the standard voltage, the processor reads the output of the signal processing circuit through y, and substituting into the linear transfer equation: y = kx + b, in accordance with known b zero offset or transmission coefficient k solve transmission coefficient k or zero offset b; then switch to measure voltage, read the corresponding voltage by measuring the signal processing circuit after the output y, according to the transmission and processing of the above equation results obtained in Step y, the processor to obtain measured voltage value;

(C)、当信号处理电路的线性度误差超出测量精度的要求时,采用多个标准电压模块; 处理器控制开关切换电路,将信号处理电路的输入电压χ依次切换到所有的标准电压模块和测量电压,读出它们经过信号处理电路的输出结果y,根据它们的y判断出离测量电压最近的比测量电压大的标准电压模块和离测量电压最近的比测量电压小的标准电压模块,根据这两个标准电压模块的电压χ和它们经过信号处理电路的输出结果y,代入线性传输方程y = kx + b;解出传输系数k和零点偏移b,然后根据测量电压经信号处理电路后的输出结果y计算出测量电压值。 (C), when the linear error signal processing circuit outside the measurement accuracy requirements, the use of a plurality of standard voltage modules; a processor controlling the switching circuit, the input voltage χ signal processing circuit sequentially switching the standard voltage to all modules and measuring voltage, which is read out through the signal processing circuit of the output y, according to their y is judged from the measured voltage nearest larger than the measured voltage and the standard voltage module from the measured voltage smaller than the voltage closest standard voltage measurement module, according to Both standard voltage module voltage χ and they pass the signal processing circuit output y, into the linear transport equation y = kx + b; solve transmission coefficient k and the offset b, then the measured voltage by the signal processing circuit after The output y of the measured voltage values is calculated.

[0013] 本发明的方法a中,标准电压1和标准电压2设为待测量电压的上、下限或接近上、下限的电压值。 [0013] a method of the present invention, the standard voltage and the standard voltage is set to a voltage to be measured 2, close to the upper limit or lower limit voltage value.

[0014] 本发明的方法b中,如果信号处理电路的传输系数k已知,则标准电压模块设置为测量电压输入的下限或接近下限的电压值;如果信号处理电路的零点偏移b已知,则标准电压模块设置为测量电压输入的上限或接近上限的电压值;当下限为零电压时,直接将信号地作为标准零电压。 [0014] Method b present invention, if the transmission coefficient k of the signal processing circuit is known, the standard voltage module arranged to measure the voltage input of the lower limit or near the lower limit voltage value; if the signal processing circuit is known zero offset b , the standard voltage module arranged to measure an upper limit voltage value of the input voltage or close to the upper limit; zero voltage when the lower limit, the signal directly to the zero voltage as a standard.

[0015] 本发明的方法c中,多个标准电压模块为多个独立的标准电压模块或者由一个标准电压模块和电阻衰减网络构成,所述的一个标准电压模块经电阻衰减网络产生多个标准电压。 [0015] c methods of the present invention, a plurality of the standard voltage generating a plurality of standard modules for a plurality of independent standard-voltage module or modules and by a standard voltage attenuation network of resistors, said voltage module via a standard resistive attenuator network Voltage.

[0016] 本发明的标准电压模块为根据系统测量精度的要求选用的电压基准芯片、或电压基准芯片加放大或衰减电路;如系统测量精度要求0到70度范围内精度优于0. 5%时,可选用精度优于0. 2%、温漂优于20ppm的电压基准芯片,如ADR01AR。 [0016] standard voltage module of the invention according to the system requirement of measurement selected voltage reference chip, or chip voltage reference with amplifier or attenuator circuit; system measurement accuracy requirements in the range of 0-70 degrees accuracy of better than 0.5% , the choice of accuracy of better than 0.2%, better than 20ppm drift voltage reference chip, such as ADR01AR.

[0017] 本发明的有益效果: [0017] The beneficial effects of the present invention:

在本发明中,只要信号处理电路的线性度误差足够小(实际使用中,就算是低成本的信号处理电路所使用的器件,如电阻、运算放大器以及A/D转换器等,它们的线性度误差都是可以忽略不计的),测量电压的误差就只与标准电压模块相关,这就从理论上消除了信号处理电路,如放大器电路、A/D转换器等所带来的误差,从而达到了只需要使用低成本的信号处理电路就能实现高精度测量电压的目的;而本发明中所需要的标准电压模块,在测量电路中都是作为A/D转换器的基准电压输入而现存的,本发明无须再为该模块增加成本。 In the present invention, as long as the linearity error signal processing circuit is sufficiently small (in actual use, even low-cost signal processing circuit used in the device, such as resistors, operational amplifiers and A / D converters, etc., their linearity error is negligible), the error of the measured voltage to the module associated with only the standard voltage, which theoretically eliminate the signal processing circuit, such as an amplifier circuit, A / D converters, etc. caused by error, so as to achieve the only need to use low-cost high-accuracy signal processing circuit can realize the purpose of measuring the voltage; and a standard voltage module of the present invention is required, as in the measuring circuit are A / D converter reference voltage input and the existing , the present invention is no need to increase the cost for the module. [0018] [0018]

附图说明 Brief Description

[0019] 图1是本发明的原理框图。 [0019] Figure 1 is a schematic block diagram of the present invention.

[0020] 图2是使用多个标准电压模块的传输曲线图。 [0020] Figure 2 is a voltage of the module using a plurality of transmission standard graph.

[0021] 图3是使用一个标准电压模块和电阻衰减网络产生多个标准电压模块的示意图。 [0021] FIG. 3 is a standard voltage generation module and a schematic view of a plurality of resistive attenuation network standard voltage modules.

[0022] [0022]

具体实施方式 DETAILED DESCRIPTION

[0023] 下面结合附图和实施例对本发明作进一步的说明。 [0023] accompanying drawings and the following embodiment of the present invention will be further described.

[0024] 如图1所示,一种低成本高精度的电压测量系统,其特征是它包括开关切换电路、 信号处理电路、处理器和显示模块,所述的开关切换电路的输入端接测量电压和至少一个标准电压模块,开关切换电路的输出端接信号处理电路的信号输入端,信号处理电路的信号输出端与处理器相连,处理器的控制信号输出端与开关切换电路相连,处理器与显示模块相连,显示模块作为电压测量系统的信号输出,显示测量结果。 [0024] Figure 1, a low-cost high-precision voltage measurement system, characterized in that it comprises a switching circuit, a signal processing circuit, a processor and a display module, said measurement input terminal of the switching circuit voltage module and at least one standard voltage, the signal input terminal of the switching circuit of the output termination signal processing circuit, signal processing circuit and a signal output terminal coupled to the processor, the processor of the control signal output terminal of the switching circuit is connected to the processor is connected with the display module, the display module as the signal output of a voltage measurement system, the measurement result is displayed.

[0025] 本发明的信号处理电路包括A/D转换器、放大器、衰减电路和滤波器。 The signal processing circuit [0025] The present invention includes A / D converters, amplifiers, attenuation circuits and filters. 信号处理电路的作用是把测量电压和标准电压经过放大或衰减以及滤波等,处理成符合A/D转换器要求的电压,如果测量电压不需要任何处理就符合A/D转换器要求的电压,则放大器、衰减电路和滤波器可以省略。 Role of the signal processing circuit is to measure the voltage and the standard voltage is amplified or attenuated, and filtering, processing to conform to A / D converter required voltage, if the measured voltage does not require any treatment for the voltage A / D converter is required, the amplifier, the attenuation circuits and filters may be omitted.

[0026] 图1中信号处理电路的传输方程为(假设信号处理电路的线性度误差忽略不计): y = kx + b [0026] FIG signal transfer equation for a processing circuit (signal processing circuit assuming linearity error is negligible): y = kx + b

其中:y——信号处理电路的输出结果; χ——输入电压; k——电路的传输系数; b——零点偏移; 根据测量系统精度要求的不同,该发明有以下四种实现方式: A、信号处理电路的线性度误差忽略不计,只需要得到准确的信号处理电路的零点偏移和传输系数,就能满足测量精度要求时(此时需要两个标准电压模块,这两个标准电压模块的电压通常设置为测量电压输入的上、下限,该处理方法为该发明最常见的一种处理方法, 因为就算是低成本的处理电路所使用的器件,其线性度误差都可以忽略不计,但其零点偏移和传输系数会误差较大,而且最关键的是他们同时会随着时间和温度的变化而变化): Where: y-- output signal processing circuit; χ-- input voltage; transmission coefficient k-- circuit; b-- zero offset; depending on the accuracy of the measurement system, the invention has the following four ways: A, the linearity of the error signal processing circuit is negligible, only needs to be offset and the transmission coefficient accurate signal processing circuit, the measurement accuracy can meet requirements (in this case requires two standard voltage module, both standard voltage voltage module is normally set to measure the voltage input, the lower limit, the processing method for the invention of the most common form of treatment, because even if the device is used for low-cost processing circuit, the linearity error can be negligible, But it will be offset and the transmission coefficient error is larger, but the key is that they will also change over time and temperature changes):

处理器控制开关切换电路,将信号处理电路的输入电压χ依次切换为标准电压1和标准电压2,处理器读出各输入电压对应的信号处理电路的输出结果y,并代入线性传输方程y = kx + b ;处理器解出信号处理电路的传输系数k和信号处理电路的零点偏移b,然后切换至测量电压,读出对应测量电压经信号处理电路后的输出结果y,根据以上步骤得到的传输方程和输出结果y,处理器得到测量电压值; Processor control switching circuit, the input voltage χ signal processing circuit 1 are sequentially switched to the standard voltage and the standard voltage 2, the processor reads out an output y corresponding to the respective input voltage signal processing circuit, and substituted into the linear equation y = transmission kx + b; processor solve the signal processing circuit of the transmission coefficient k and the signal processing circuit of the zero offset b, and then switch to the measured voltage, the measured voltage is read out by the corresponding signal processing circuit after the output y, obtained according to the above step The transfer equation and the output y, the processor be measured voltage value;

在实际使用时,随着温度和时间的变化,信号处理电路本身的参数会发生变化(也就是传输方程中的k和b会发生变化),但只要处理器控制开关切换电路重新切换到标准电压并修正k和b (该动作可以定时进行,如果处理器还连接有温度传感器,也可以根据温度的变化进行),就能保证实际测量电压的值与电路本身参数的变化无关。 In actual use, with the change of temperature and time parameters of the signal processing circuit itself vary (i.e. transmission equation k and b vary), but as long as the processor controlling the switching circuit to switch back to the standard voltage and corrected k and b (the timing operation can, if the processor is also connected with a temperature sensor, can also be based on temperature changes), we can guarantee the change of the actual measurement voltage independent of the value of the parameters of the circuit itself.

[0027] B、信号处理电路的线性度误差忽略不计,只需要得到准确的信号处理电路的零点偏移,就能满足测量精度要求时(此时只需要一个标准电压模块,这个标准电压模块的电压通常设置为测量电压输入的下限,当下限为零电压时,可以直接将信号地作为标准电压): [0027] B, the linearity of the error signal processing circuit is negligible, only need to be offsets accurate signal processing circuit, the measurement accuracy can meet requirements (in this case only a standard voltage module, the module of the standard voltage voltage is typically set to a lower limit voltage measurement input, when the lower bound of zero voltage, the signal can be directly used as a standard voltage):

处理器通过开关切换电路,将信号处理电路的输入电压X切换为标准电压1,处理器读出对应的信号处理电路的输出结果y,并代入线性传输方程:y = kx + b,传输系数k根据实际电路的理论计算值或人工测量值代入方程,根据方程式解出b,然后切换输入电压χ 为测量电压输入,读出对应的信号处理电路的输出结果y,根据以上步骤得到的传输方程和输出结果y,处理器得到测量电压值。 Processor through the switching circuit, the input voltage of the signal processing circuit X 1 is switched to the standard voltage, the processor reads a corresponding signal processing circuit of the output y, and substituting into the linear transfer equation: y = kx + b, the transmission coefficient k According to the theoretical calculation value of the actual circuit or manual measurement values into the equation, according to the equation solved for b, and then switch the input voltage χ for measuring voltage input, reads out an output y corresponding to the signal processing circuit, the transfer equation based on the above steps obtained and output y, the processor be measured voltage value.

[0028] C、信号处理电路的线性度误差忽略不计,只需要得到准确的信号处理电路的传输系数,就能满足测量精度要求时(此时只需要一个标准电压模块,这个标准电压模块的电压通常设置为测量电压输入的上限): When the [0028] C, the linearity of the error signal processing circuit is negligible, only the transmission coefficient needs to be accurate signal processing circuit, the measurement accuracy can meet the requirements of the voltage (in this case only a standard voltage module, the module of the standard voltage the upper limit is usually set to measure the voltage input):

处理器通过开关切换电路,将信号处理电路的输入电压χ切换为标准电压1,处理器读出对应的信号处理电路的输出结果y,并代入线性传输方程:y = kx + b,零点偏移b根据实际电路的理论计算值或人工测量值代入方程,根据方程式解出k,然后切换输入电压χ 为测量电压输入,读出对应的信号处理电路的输出结果y,根据以上步骤得到的传输方程和输出结果y,处理器得到测量电压值。 Processor through the switching circuit, the input voltage χ signal processing circuit 1 is switched to the standard voltage, the processor reads a corresponding signal processing circuit of the output y, and substituting into the linear transfer equation: y = kx + b, zero offset b. Depending on the calculated value of actual circuit or manual measurement value generation equation according to equation solved for k, and then switch the input voltage χ for measuring voltage input, reads out the output corresponding to the signal processing circuit of y, transfer equation based on the above steps obtained and output y, the processor to obtain the measured voltage value.

[0029] D、信号处理电路的线性度误差不能忽略不计,也就是传输方程不能作为一个直线方程处理时,可以根据线性度误差的大小(相对与测量精度而言)将传输曲线平均分为多段,线性度误差越大则需要分段数越多,每一小段作为直线来处理来,这样就需要多个标准电压模块来校准每一小段范围内的测量电压,如图2,而且这多个标准电压模块也可以直接由一个标准电压模块和电阻衰减网络代替,如图3): [0029] D, linearity error signal processing circuit can not be ignored, that is, the transmission equation can not be treated as a linear equation, it is possible according to the size of the linearity error (relative to the measuring accuracy in terms of) the transmission curves were divided into multi-segment linearity error of the greater number of segments you need more, as per a short straight line processing, which will require more than the standard voltage module to calibrate the measured voltage range within each segment, shown in Figure 2, and this more than Standard voltage module can also be attenuated directly from a standard voltage module and replace the resistor network shown in Figure 3):

处理器控制开关切换电路,将信号处理电路的输入电压χ依次切换到所有的标准电压模块和测量电压,读出它们经过信号处理电路处理的结果y,根据它们的y判断出离测量电压最近的比测量电压大的标准电压模块和离测量电压最近的比测量电压小的标准电压模块,根据这两个标准电压模块的电压χ和它们经过信号处理电路处理的结果y,代入线性传输方程y = kx + b;解出传输系数k和零点偏移b,然后根据测量电压经信号处理电路后的处理结果y计算出测量电压值; Processor control switching circuit, the input voltage χ signal processing circuit sequentially switched to all standard voltage module and measuring the voltage, which is read out through the signal processing circuit processing the result of y, according to their y is judged from the latest measurement voltage larger than the measured voltage standard voltage module and measure the voltage from the nearest smaller than the voltage measurement standard voltage module, according to the two standard voltage module voltage χ and they go through the results of the signal processing circuit y, into the linear transport equation y = kx + b; solve transmission coefficient k and the offset b, y then calculated by measuring the voltage according to the processing results of the signal processing circuit after the measured voltage value;

本发明未涉及部分均与现有技术相同或可采用现有技术加以实现。 The present invention relates to parts are not the same as the prior art or prior art can be realized.

7 7

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Référencé par
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Classifications
Classification internationaleG01R19/00
Événements juridiques
DateCodeÉvénementDescription
7 déc. 2011C06Publication
25 janv. 2012C10Entry into substantive examination
6 nov. 2013C02Deemed withdrawal of patent application after publication (patent law 2001)