CN102393484A - Device for detecting stability of current - Google Patents

Device for detecting stability of current Download PDF

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CN102393484A
CN102393484A CN 201110253260 CN201110253260A CN102393484A CN 102393484 A CN102393484 A CN 102393484A CN 201110253260 CN201110253260 CN 201110253260 CN 201110253260 A CN201110253260 A CN 201110253260A CN 102393484 A CN102393484 A CN 102393484A
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current
differential amplifier
mcu
stability
unit
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CN 201110253260
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Chinese (zh)
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卜令旗
徐春叶
方岚
焦贵忠
田波
郑宇�
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华东光电集成器件研究所
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Abstract

The invention relates to a device for detecting the stability of current of an electronic circuit. A digital-to-analog converter (DAC) is controlled by a main control unit (MCU) according to a data acquisition unit analog-to-digital converter (ADC) to output a threshold reference voltage Vref, and the threshold reference voltage Vref is required to be equal to V0. The threshold reference voltage Vref and real-time voltage difference V1 of both ends of a sampling resistor, which is output by a difference amplifier, are sent to the MCU through the data acquisition unit ADC after being amplified by the difference amplifier. At the time, current variable quantity deltaI can be calculated through a formula obtained in the method, and finally, whether the current variable quantity meets the requirement or not is judged through software in unit time, thereby, the stability of the whole loop current is judged. The device for detecting the stability of the current of the electronic circuit has the advantages that the interference of system noise can be effectively eliminated, thus, the slight changes of the current can be accurately detected; specifically implemented hardware has strong universality; the device for detecting the stability of the current of the electronic circuit can be suitable for detecting the stability of the current of ampere level or below in various direct-current circuits and has wide application range.

Description

一种电流稳定性检测装置 A current detecting means Stability

[0001] 技术领域: [0001] Technical Field:

本发明涉及电子线路中电流稳定性测试装置,尤其适用于大电流状态下微小变化的稳定性检测。 The present invention relates to an electronic circuit in the current stability test device, especially for small changes in the large current state stability testing.

[0002] 背景技术: [0002] BACKGROUND:

在对电子线路整体性能评价的参数项目中电流是重要的电特性指标,电源功耗电流、 回路漏电流、输出电流等多项电流指标的大小都直接表征着整个线路中各个电流回路是否正常,因此回路电流的具体大小往往是关注的对象,然而之前对电流变化状态即电流稳定性没有引起足够的重视。 In performance evaluation of parameters of the project of the entire electronic circuit electrical current is an important characteristic index, the size of the index number of the current supply current consumption, leakage current circuit, output current directly characterize the entire line of each current loop is normal, Therefore, the specific size of the loop current is often the object of concern, however, before the change of the current state of the current stability that is not taken seriously enough. 随着技术的发展,连接在电子线路中的各种电子器件越来越多, 器件的性能及工作的精细化要求程度越来越高,各个电流回路中电流微小的变动都有可能引起部分器件工作不可靠,导致整个线路状态出现异常,因此回路中电流稳定性检测逐步受到重视。 With the development of technology, electronic circuits connected in a variety of electronic devices more and more, the degree of precision required performance and operating devices become more sophisticated, small changes each current loop currents are likely to cause portions of the device unreliable operation, resulting in an abnormal state of the entire line appear, and therefore the stability of the loop current detection gradually attention. 目前在已公开的相关专利中已经开始出现关于电流变化的检测方法,如专利号为:200810140838. 5,专利名称为《利用电流变化率检测短路故障的方法》采用了根据线路或用电设备短路故障状态下的电流波形变化与正常情况下的电流波形变化的区别,实现对某一时间段内的电流变化率进行连续检测。 DETECTION OF now beginning to appear in the current variation related patent disclosure, as patent number: 2008101408385, and entitled "Method using a current change rate detector of the short-circuit failure" with a short circuit or electrical equipment according to the line variation of the difference between the current waveform and the current waveform change fault condition under normal circumstances, to achieve the current rate of change is continuously detected a certain time period. 这种方法对系统噪声的扰动没有有效的抑制,当需要检测变化率为万分之一的电流变量时,这种方法极易受到系统噪声的影响。 This method is not effective for suppressing noise perturbed system, when necessary to detect the current change rate variable parts per million, this method is highly susceptible to system noise.

[0003] 发明内容: [0003] SUMMARY OF THE INVENTION:

本发明的目的就是为了克服现有技术中电流检测极易受到系统噪声干扰的缺陷,提供的一种电流回路电流稳定性检测装置。 Defects object of the present invention is to overcome the prior art current sensing noise of the system vulnerable to a current loop current detection means for providing the stability.

[0004] 为实现本发明的目的,提出了以下技术解决方案: [0004] To achieve the object of the present invention, the following technical solutions proposed:

一种电流稳定性检测装置,其特征在于:由取样电阻、差分放大器A、差分放大器B、多路选通器MUX、数据采集单元ADC、数模转换单元DAC、主控单元MCU和显示单元组成; A current detecting device stability, comprising: a sampling resistor, a differential amplifier A, B of the differential amplifier, the MUX multiplexer strobe, the ADC data acquisition unit, the DAC digital-analog converting unit, the main control unit MCU and a display unit composed of ;

取样电阻R串接在电流回路中将待测电流转换为电压并将电压输出到差分放大器A的输入端; A current sampling resistor R connected in series in the loop current to be measured to convert the output voltage of the differential amplifier A and the voltage input terminal;

差分放大器A的输出受主控单元MCU的控制,主控单元MCU控制多路选通器MUX的选通开关,使差分放大器A的输出直接给选通器MUX或者连接到差分放大器B ; A differential amplifier receiving the output of the main control unit MCU, the master control unit MCU controls the multiplexer MUX strobe gate switch, the output of the differential amplifier to the gate A is directly connected to the MUX is a differential amplifier, or B;

多路选通器MUX的输入端接收从差分放大器A或差分放大器B的输出信号,直接送给数据采集单元ADC; Input of the multiplexer MUX strobe signal of the differential amplifier receives the output of the differential amplifier A or B from the data collection unit directly to the ADC;

数据采集单元ADC将从多路选通器MUX得到的信号以ASII代码的形式送入主控单元 Signal from the data acquisition unit ADC multiplexer MUX strobe obtained is fed to the main control unit in the form of code ASII

MCU ; MCU;

数模转换单元DAC接收从主控单元MCU来的数据并转换成模拟信号送给差分放大器 Digital to analog converting DAC receives from the MCU to the master unit and data into an analog signal to the differential amplifier

B ; B;

主控单元MCU接受数据采集单元ADC送来的数据,并通过软件处理输出到数模转换单元DAC,或送给回路开关SW或送给显示单元; The main control unit MCU receives the data sent from the data acquisition unit ADC, and output to the digital to analog conversion means DAC by software processing, or sent to the circuit switch SW or a display unit;

回路开关SW和显示单元根据主控单元MCU发送来的数据给出开关的通断指令或发出 The switch circuit SW and a display unit gives a command switch-off the main control unit MCU based on data transmitted or emitted

报警信号。 Alarm.

[0005] 本发明所采用的技术方案具体工作过程包含四个部分:1、回路中进行压流转换,完成电流测量。 [0005] Technical Solution specific working process used in the present invention comprises four parts: 1, the voltage-current conversion circuit is performed, to complete the current measurement. 将取样电阻R串接在电流回路中,通过一增益为Gl的差分放大器A得到取样电阻两端的电压差VO,该电压由数据采集模块ADC采集后送入主控单元MCU,在MCU内首先将采集数据被存入寄存器,然后通过软件编辑计算得到回路中电流值I,通过I检测电路是否工作在正常状态。 The sampling resistor R connected in series with the current loop, to obtain a voltage difference across the sense resistor for the VO Gl through a differential amplifier gain A, the voltage generated by the ADC acquisition data acquisition module into the master control unit MCU, the first MCU in data collected is stored in the register, then the circuit current value I obtained through calculation editing software, whether operating in a normal state by the I detection circuit.

[0006] 2、设置精密基准电压Vref。 [0006] 2, disposed precision reference voltage Vref. 在通过回路电流值I判断电路工作正常后,将主控单元MCU内寄存器中的数据调出送入模数转换模块DAC,由DAC控制输出一精密基准电压Vref,要求Vref与VO相等。 After determining the current value I loop circuit is working properly, the master control unit MCU data in register recall DAC into analog to digital conversion module, a precision reference voltage Vref output from the DAC control request is equal to Vref and VO.

[0007] 3、接入反馈阈值电压进行实时采集比较。 [0007] 3, access feedback threshold voltage comparing real-time acquisition. 由DAC输出的精密基准电压Vref作为反馈阈值电压与增益为G2的差分放大器B负向输入端连接,差分放大器B正向输入端与实时采集取样电阻两端压差Vl的差分放大器A的输出端连接,放大器B输出电压Δ V即电流变化量Δ I经过压流转换且两次增益后的数值,Δ V由ADC进行数据采集后送入主控单元MCU,在MCU中通过软件编辑按照公式: Precision reference voltage Vref outputted by the DAC as the feedback gain of the threshold voltage of the differential amplifier G2 is connected to the B negative input terminal of the differential amplifier B and the non-inverting input terminal of the output sampling resistor real-time acquisition Vl differential pressure across the amplifier A connection, the output voltage of the amplifier B i.e. the current change amount Δ V Δ I flows through the pressure value after the conversion gain and two, Δ V be fed to the main control unit MCU after the ADC by a data acquisition, editing by software in the MCU according to the formula:

Δ I= Δ V/ (R*G1*G2) 计算出回路中单次电流变化量。 Δ I = Δ V / (R * G1 * G2) calculates the amount of change per current loop.

[0008] 4、判断回路电流稳定性。 [0008] 4, the stability of the loop current is determined. 通过软件计算单位时间回路电流变化量Δ I与MCU内部预置的变化量Δ IS进行比较,判断回路电流稳定性是否满足要求。 Loop current change amount per unit time and the amount of change Δ I preset internal MCU Δ IS calculated by the software, and determines whether the loop current stability to meet the requirements.

[0009] 本发明的优点: [0009] The advantages of the present invention:

本发明与现有技术相比,其显著优点是: Compared with the prior art the present invention, which is a significant advantage:

1、本发明采用了将电流初值进行压流转换并设定为反馈阈值电压,然后与实时采集信号差分放大的方法进行电流稳定性检测,这种方法可以有效的排除系统噪声的干扰,精确的检测到电流微小的变化。 1, the present invention employs a pressure-current initial value is set to the stream converter and feedback threshold voltage, then the stability of the current real-time detection and signal acquisition method for differential amplification, this method can effectively eliminate the interference system noise, accurate the current is detected small changes.

[0010] 2、本发明具体实施的硬件通用性强,根据回路电流状态及检测精度要求,使用市场成熟的不同的性能的外围硬件均可实现本发明。 [0010] 2, the specific hardware embodiment of the present invention, versatility, and according to the state of loop current detection accuracy, the use of different market mature peripheral hardware performance of the present invention may be implemented.

[0011] 3、本发明可适用于各种直流回路中安培级以下电流稳定性检测,适用范围广。 [0011] 3, the present invention is applicable to a variety of DC loop current amps or less stability testing, a wide range.

[0012] 附图说明: [0012] BRIEF DESCRIPTION OF DRAWINGS:

附图1为本发明测试原理总框图; 附图2为本发明电流检测单元结构图; 附图3为本发明检测电流稳定性的流程图。 BRIEF 1 is a general block diagram the principle of the invention tested; current detecting means configuration diagram of the present invention. FIG. 2; the detected current flow chart 3 of the present invention the stability of the accompanying drawings.

[0013] 具体实施方式: [0013] DETAILED DESCRIPTION:

下面结合附图对本发明的最佳实施例作进一步详细描述: DRAWINGS Examples of the preferred embodiments of the present invention will be described in further detail:

本发明提供一种回路直流电流稳定性检测装置,附图1中概括了此方法主要涉及的几个功能单元,包括:回路开关SW用于控制电流回路的通断状态;取样电阻R串接在电流回路中完成压流转换,将电流测量转换为电压测量模式;差分放大器A用于输出取样电阻两端的电压差;多路选通器MUX用于切换数据采集单元的输入状态;数据采集单元ADC用于采集各种电压信号;主控单元MCU是系统的核心构成,用于对采集信号进行存储、软件处理和判断,同时MCU还控制多路选通器MUX、回路开关SW、以及显示单元DIS的状态。 The present invention provides a stable DC loop current detector means, summarizes several features of this method it relates unit figures 1, comprising: a switch circuit SW for controlling on-off state of the current loop; sampling resistor R is connected in series complete flow in the current loop converter, converting the current measured as a voltage measurement mode; a differential amplifier for outputting a voltage difference between the ends of the sampling resistor; multiplexer MUX for strobe input state switching data acquisition unit; ADC data acquisition unit for acquiring various voltage signals; master control unit MCU constitutes a core of the system, for storing signal acquisition, and software processing is determined, and also controls the multiplexer MCU strobe the mUX, the switch circuit SW, and the display unit DIS status. 数模转换单元DAC主要在MCU控制下输出基准阈值电压;差分放大器B用于输出基准阈值电压Vref 与差分放大器A实时输出电压Vl的电压差Δ V。 Digital to analog converting DAC output main reference threshold voltage under control of MCU; B differential amplifier for outputting a voltage difference between the reference threshold voltage Vref and the output voltage of the differential amplifier A real Vl of Δ V.

[0014] 检测方法的具体实现结合附图2说明如下:检测系统上电后,首先通过外部回路接入端1(200)和接入端2(210)被串接在电流回路中,然后由主控单元MCU (206)中处理器模块O06c)控制其I/O控制模块输出控制信号,依次完成控制差分放大器A(2(X3)的增益Gl和回路开关SW (201)导通状态的设定, 再将取样电阻R(202)串接在电流回路中,并将电阻两端与差分放大器A(203)的第1、2输入端连接。电阻两端的电压差VO由差分放大器A(203)输出端3输出,此时由MCW203)中处理器模块O06c)控制其I/O控制模块输出信号控制多路选通器MUX (204)状态, 将电压VO输送至数据采集单元ADC (20¾中。电压VO由数据采集模块ADC (20¾采集后送入主控单元MCU006),MCU内部包含了寄存器模块O06d、206e)、处理器模块(206c)、定时器模块G06b)以及IO控制模块O06a),ADC(205)输出的信号以ASCII码形式经MCU(206) 处理器模块O06c) 2 illustrates a specific implementation of [0014] Detection of the accompanying drawings as follows: After the system is detected, first the current loop connected in series through the external circuit to the terminal 1 (200) and an access terminal 2 (210), and then by the the main control unit MCU (206) in the processor module O06c) which controls I / O control module outputs a control signal, in order to complete the control of the differential amplifier a (2 (X3) gain Gl and the switch circuit SW (201) disposed in the conductive state set, then the sampling resistor R (202) connected in series in the current loop, and the resistance across the differential amplifier a (203) of the first and second input terminal connected to the voltage VO across the resistance difference by the differential amplifier a (203 ) output terminal 3 output, and the control by the MCW203) processor module O06c) which I / O control module output signal strobe controls the multiplexer mUX (204) state, the voltage VO is conveyed to the data acquisition unit ADC (20¾ in voltage VO by the data acquisition module ADC (20¾ after collection into the main control unit MCU006), MCU comprising a register block internal O06d, 206e), the processor module (206c), a timer module G06b) and the IO control module O06a), signal output from the ADC (205) in ASCII form by the MCU (206) processor module O06c) 终存入寄存器模块存储器A Q06d)中,此时采集的代码所代表的电压VO与回路电流I的关系为:I=V0/(R*G1);在MCUQ06)内部核心单元处理器模块O06c)中通过软件将代码进行处理后,完成采集数据与回路中电流的换算,得到回路电流I,再次通过软件判断电流I是否在正常范围内,电流异常则先通过MCU(206)内部处理器模块O06c) 控制其I/O控制模块输出信号控制回路开关SW(201)断开电流回路,然后MCU(206) 内部处理器模块O06c)控制其I/O控制模块输出信号控制显示单元DIS (209)输出声光报警信息,检测系统断电,检测结束。 Final memory module stored in the register A Q06d), the relationship between the voltage VO loop current I at this time is represented by the acquired code is: I = V0 / (R * G1); in MCUQ06) inside the core unit processor module O06c) after the processing by software code, data acquisition is completed and the current conversion circuit, the circuit current I is obtained, again by the software determines whether the current I within the normal range, an abnormal current through the first MCU (206) inside the processor module O06c ) control the I / O control module output signal for controlling the switch circuit SW (201) off current circuit and MCU (206) inside the processor module O06c) which controls I / O control module output signal controls the display (209) an output unit DIS sound and light alarm information, the detection system is powered off, the end of the test. 电流正常则调出MCU寄存器iU206d)中存储的数据代码,代码经处理器模块O06c)控制I/O控制模块输出并送入模数转换单元DAC(205)中,由其输出基准阈值电压Vref,作为后期的比较基准阈值,要求Vref与VO 相等。 Normal calls up the current MCU register iU206d) data stored code, the code by the processor module O06c) control I / O control module output and fed to analog-digital conversion unit DAC (205), the reference output by the threshold voltage Vref, the as a comparison reference threshold later required is equal to Vref and VO. 此处MCU(206)与DAC(207)之间的数据传输仅在首次数据采集后进行,随后的变量检测过程中,MCU(206)不再向DAC(207)传输数据。 Here the data transmission between the MCU (206) and the DAC (207) after initial data acquisition for the subsequent detection process variable, MCU (206) is no longer data to the DAC (207) transmission. 在DAC(207)设定Vref后,由主控单元MCW206)中处理器模块O06c)先后控制I/O控制模块输出控制信号依次完成差分放大器B(208)的增益G2、控制内部定时模块Q06b)单位定时T以及单位时间T回路电流变化极限比较阈值Δ IS的设定,Δ IS的值被存入寄存器W206e)中。 After the DAC (207) set to Vref, the main control unit MCW206) processor modules O06c) has control I / O control module outputs a control signal in order to complete the differential amplifier B (208) the gain G2, the timing of the internal control module Q06b) T units and the timing circuit current change per unit time T limit comparator threshold value [Delta] iS set, Δ value (iS) is stored in the register W206e) in. 然后差分放大器A(2(X3)输出端及基准阈值电压Vref分别连接到差分放大器B(208)的第1、2输入端口,此时差分放大器A(203)输出端电压为取样电阻R(202)两端的电压是实时压差VI,通过I=Vl/ (R*G1)可以得到回路中的实时电流。差分放大器B(208)输出端电压AV即为经过压流转换后的实时电流变化量Δ I。MCU(206)中处理器模块O06c)控制其I/O控制模块输出控制信号控制多路选通器MUX(204)状态,将电压Δ V输送至数据采集单元ADC(205)中,ADC(2(^)将采集的数据以ASII代码的形式送入主控单元MCUQ06),在处理器模块中通过软件还原Δ I数值:Δ I= Δ V/ (R*G1*G2),并将Δ I数值在寄存器B (206e)中存储的预置回路电流变化极限比较阈值Δ IS进行比较,当Δ I超出规定阈值,判定回路电流稳定性不满足要求,则先由MCU Q06)中处理器模块O06c)控制其I/O控制模块输出控制信号,首先使回路开关SWO01)处于断开 And a differential amplifier A (2 (X3) and the output of the threshold reference voltage Vref are connected to a differential amplifier B (208) of the first and second input ports, this time of the differential amplifier A (203) output terminal voltage sampling resistor R (202 voltage) across the real-time pressure VI, can be obtained in real time through the loop current I = Vl / (R * G1). the differential amplifier B (208) the output voltage AV is the change in the real-time current flow through the conversion press Δ I.MCU processor module O06c (206)) is a control module which controls the output I O / control signal strobe multiplexer mUX (204) state, the voltage Δ V will be delivered to the ADC data acquisition unit (205), ADC (data collected 2 (^) is fed as the main control unit ASII code MCUQ06), by reducing the value Δ I software module in a processor: Δ I = Δ V / (R * G1 * G2), and the value of the current change Δ I limit comparator threshold Δ iS comparison register B (206e) is stored in the preset circuit, when Δ I exceeds a predetermined threshold value, determines that the loop current does not satisfy the requirements of stability, first by MCU Q06) treated module O06c) which controls I / O control module outputs a control signal, first, the switch circuit SWO01) is in an off 态,切断回路电流通路,然后控制显示单元DIS(209)输出声光报警信息,检测系统断电,检测结束。 State, cut off the loop current path, and then controls the display unit DIS (209) output sound and light alarm information, the detection system is powered off, the end of the test. 如果Δ I数值与MCU预置的回路电流变化极限比较阈值值Δ IS进行比较,当Δ I满足规定则检测继续进行。 Loop current limit comparator changes the threshold value and if the value of Δ I Δ IS MCU compares the preset, predetermined satisfied when Δ I is detected continues. [0015] 本发明采用了将电流初值进行压流转换并设定为反馈阈值电压,然后与实时采集信号差分放大的方法进行电流稳定性检测,这种方法可以有效的排除系统噪声的干扰,精确的检测到电流微小的变化。 [0015] The present invention employs a pressure-current initial value is set to the stream converter and feedback threshold voltage, then the differential amplification method of signal acquisition in real time with a current stability testing, this method can effectively eliminate the interference of the system noise, accurate current is detected small changes. 该方法应用范围广实施成本低并且硬件的通用性强。 The method and the low hardware costs embodiment a wide range of applications versatility.

Claims (1)

  1. 1. 一种电流稳定性检测装置,其特征在于:由取样电阻、差分放大器A、差分放大器B、 多路选通器MUX、数据采集单元ADC、数模转换单元DAC、主控单元MCU和显示单元组成;取样电阻R串接在电流回路中将待测电流转换为电压,并将电压输出到差分放大器A 的输入端;主控单元MCU控制多路选通器MUX的选通开关,使差分放大器A的输出直接给选通器MUX或者连接到差分放大器B ;多路选通器MUX的输入端接收从差分放大器A或差分放大器B的输出信号,直接送给数据采集单元ADC;数据采集单元ADC将从多路选通器MUX得到的信号以ASII代码的形式送入主控单元MCU ;数模转换单元DAC接受从主控单元MCU来的数据并转换成模拟信号送给差分放大器B ;主控单元MCU接收数据采集单元ADC送来的数据,并通过软件处理输出到数模转换单元DAC,或送给回路开关SW或送给显示单元。 A stable current detecting means, wherein: a sampling resistor, a differential amplifier A, B of the differential amplifier, the MUX multiplexer strobe, the ADC data acquisition unit, the DAC digital-analog converting unit, the main control unit MCU and a display units; current sampling resistor R connected in series in the loop current to be measured is converted to a voltage, and the voltage output to the a input of the differential amplifier; a main control unit MCU controls the multiplexer MUX strobe gating switch of the differential a direct output of the amplifier to the gate of the MUX is connected to a differential amplifier, or B; input of the multiplexer MUX and the gate receives the output signal from the differential amplifier a or B of the differential amplifier, the data collection unit directly to the ADC; data collection unit signal from the ADC multiplexer MUX strobe obtained is fed to the main control unit MCU as ASII code; DAC digital to analog conversion means for receiving from the main control unit MCU and converted into an analog data signal to the differential amplifier B; main control unit MCU ADC data acquisition unit receives data sent by software processing, and outputs to the DAC digital-analog converting unit, or switch SW to the loop or to the display unit.
CN 201110253260 2011-08-31 2011-08-31 Device for detecting stability of current CN102393484A (en)

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CN107064611A (en) * 2017-02-24 2017-08-18 北京深思数盾科技股份有限公司 Leakage current detection method and device

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