CN102393484A - Device for detecting stability of current - Google Patents
Device for detecting stability of current Download PDFInfo
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- CN102393484A CN102393484A CN2011102532606A CN201110253260A CN102393484A CN 102393484 A CN102393484 A CN 102393484A CN 2011102532606 A CN2011102532606 A CN 2011102532606A CN 201110253260 A CN201110253260 A CN 201110253260A CN 102393484 A CN102393484 A CN 102393484A
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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
Technical field:
The present invention relates to current stability proving installation in the electronic circuit, be particularly useful for the Detection of Stability of subtle change under the current state.
Background technology:
Electric current is important electrical characteristics index in to the parameter project of electronic circuit overall performance evaluation; Whether the size of multinomial electric current indexs such as power supply power consumption electric current, loop leakage current, output current is all directly characterizing in the whole circuit each current return normal; Therefore the object paid close attention to often of the concrete size of loop current, however be that current stability does not cause enough attention to the electric current variable condition before.Development along with technology; The various electron devices that are connected in the electronic circuit are more and more; Becoming more meticulous of the performance of device and work requires degree increasingly high; The change that electric current is small in each current return might cause that all part of devices work is unreliable, and it is unusual to cause whole line status to occur, so the current stability detection progressively comes into one's own in the loop.In disclosed related patent U.S. Patent No., begun at present to occur detection method about the electric current variation; Like the patent No. be: 200810140838.5; Patent name for " utilizing current changing rate to detect the method for short trouble " adopted according to the current waveform circuit or consumer short trouble state under change with normal condition under the difference that changes of current waveform, realize the interior current changing rate of section is sometime carried out continuous detecting.This method does not effectively suppress the disturbance of system noise, when need the change detected rate be ten thousand/ the electric current variable time, this method very easily receives the influence of system noise.
Summary of the invention:
The object of the invention is exactly that current detecting very easily receives the defective that system noise is disturbed, a kind of current return current stability pick-up unit that provides in the prior art in order to overcome.
For realizing the object of the invention, following technical solution has been proposed:
A kind of current stability pick-up unit is characterized in that: be made up of sample resistance, differential amplifier A, differential amplifier B, multi-channel gating device MUX, data acquisition unit ADC, D/A conversion unit DAC, main control unit MCU and display unit;
It is voltage and the input end that voltage is outputed to differential amplifier A that sample resistance R is serially connected in the current return current conversion to be measured;
The output of differential amplifier A receives the control of main control unit MCU, and the gating switch of main control unit MCU control multi-channel gating device MUX makes the output of differential amplifier A directly give gate MUX or be connected to differential amplifier B;
The input end of multi-channel gating device MUX receives the output signal from differential amplifier A or differential amplifier B, directly gives data acquisition unit ADC;
Data acquisition unit ADC will send into main control unit MCU with the form of ASII code from the signal that multi-channel gating device MUX obtains;
D/A conversion unit DAC receives the data from main control unit MCU and converts simulating signal to and gives differential amplifier B;
Main control unit MCU accepts the data that data acquisition unit ADC sends here, and outputs to D/A conversion unit DAC through software processes, or gives circuit switching SW or give display unit;
The data that circuit switching SW and display unit send according to main control unit MCU provide the break-make instruction of switch or send alerting signal.
The concrete course of work of the technical scheme that the present invention adopted comprises four parts:
1, carries out the baric flow conversion in the loop, accomplish current measurement.Sample resistance R is serially connected in the current return; Obtain the voltage difference V0 at sample resistance two ends for the differential amplifier A of G1 through a gain; This voltage is sent into main control unit MCU after being gathered by data acquisition module ADC; In MCU, at first deposited image data in register, calculated current value I in the loop through software editing then, whether be operated in normal condition through the I testing circuit.
2, accurate reference voltage V ref is set.After in proper working order through loop current value I decision circuitry, the data in the register in the main control unit MCU are accessed send into analog-to-digital conversion module DAC, by DAC control output one accurate reference voltage V ref, require Vref to equate with V0.
3, insert feedback threshold voltage and gather comparison in real time.Is that the differential amplifier B negative input of G2 be connected as feedback threshold voltage with gaining by the accurate reference voltage V ref of DAC output; Differential amplifier B positive input is connected with the output terminal of gathering the differential amplifier A of sample resistance two ends pressure reduction V1 in real time; Amplifier B output voltage △ V is the numerical value after the baric flow conversion of current change quantity △ I process and twice gain; △ V is undertaken sending into main control unit MCU after the data acquisition by ADC, in MCU through software editing according to formula:
△I=△V/（R*G1*G2）
Calculate single current change quantity in the loop.
4, judge loop current stability.The variable quantity △ IS that presets through computed in software unit interval loop current variable quantity △ I and MCU inside compares, and judges whether loop current stability meets the demands.
Advantage of the present invention:
The present invention compared with prior art, its remarkable advantage is:
1, the present invention has adopted the electric current initial value is carried out the baric flow conversion and is set at feedback threshold voltage; Carrying out current stability with the method for real-time acquired signal difference amplification then detects; This method is the removal system interference of noise effectively, accurately detects the small variation of electric current.
2, the hardware highly versatile of practical implementation of the present invention according to loop current state and accuracy of detection requirement, uses the peripheral hardware of the different performance of market-ripe all can realize the present invention.
3, the present invention detects applicable to the following current stability of ampere level in the various DC loops, and is applied widely.
Description of drawings:
Accompanying drawing 1 is test philosophy general diagram of the present invention;
Accompanying drawing 2 is current detecting unit structural drawing of the present invention;
Accompanying drawing 3 detects the process flow diagram of current stability for the present invention.
Embodiment:
Below in conjunction with accompanying drawing most preferred embodiment of the present invention is described in further detail:
The present invention provides a kind of loop DC current stability detector, has summarized several functional units that the method relates generally in the accompanying drawing 1, and comprising: circuit switching SW is used for the on off operating mode in Control current loop; Sample resistance R is serially connected in and accomplishes the baric flow conversion in the current return, converts current measurement into the voltage measurement pattern; Differential amplifier A is used to export the voltage difference at sample resistance two ends; Multi-channel gating device MUX is used for the input state of switch data collecting unit; Data acquisition unit ADC is used to gather various voltage signals; Main control unit MCU is that the core of system constitutes, be used for to acquired signal store, software processes and judgement, MCU also controls the state of multi-channel gating device MUX, circuit switching SW and display unit DIS simultaneously.D/A conversion unit DAC is output reference threshold voltage under MCU control mainly; Differential amplifier B is used for the voltage difference △ V of output reference threshold voltage Vref and the real-time output voltage V 1 of differential amplifier A.
The concrete realization of detection method combines accompanying drawing 2 explanations as follows:
After detection system powers on; At first be serially connected in the current return through external circuit incoming end 1 (200) and incoming end 2 (210); Control its I/O control module (206a) output control signal by processor module (206c) among the main control unit MCU (206) then; Accomplish the setting of gain G 1 and circuit switching SW (201) conducting state of control differential amplifier A (203) successively; Again sample resistance R (202) is serially connected in the current return, and the resistance two ends are connected with the 1st, 2 input ends of differential amplifier A (203).The voltage difference V0 at resistance two ends is by 3 outputs of differential amplifier A (203) output terminal; Control its I/O control module (206a) output signal controlling multi-channel gating device MUX (204) state by processor module (206c) among the MCU (203) this moment, and voltage V0 is delivered among the data acquisition unit ADC (205).Voltage V0 sends into main control unit MCU (206) after being gathered by data acquisition module ADC (205); MCU inside has comprised register module (206d, 206e), processor module (206c), timer module (206b) and IO control module (206a); The signal of ADC (205) output finally deposits among the register module storer A (206d) through MCU (206) processor module (206c) with the ASCII character form, and the voltage V0 of the code representative that gather this moment and the relation of loop current I are: I=V0/ (R*G1); After in MCU (206) internal core Cell processor module (206c), code being handled through software; Accomplish the conversion of electric current in image data and the loop; Obtain loop current I; Judge electric current I whether in normal range through software once more, current anomaly is then controlled its I/O control module (206a) output signal controlling circuit switching SW (201) turn-off current loop through MCU (206) internal processor module (206c) earlier, and MCU (206) internal processor module (206c) is controlled its I/O control module (206a) and exported signal controlling display unit DIS (209) and export sound and light alarm information then; The detection system outage detects and finishes.Electric current normally then accesses the data code of storage among the MCU register A (206d); The treated device module of code (206c) control I/O control module (206a) is exported and is sent among the AD conversion unit DAC (205); By its output reference threshold voltage Vref; As the benchmark threshold value in later stage, require Vref to equate with V0.Data transmission between MCU (206) and the DAC (207) is only carried out after data acquisition first here, and in the variable testing process subsequently, MCU (206) is no longer to DAC (207) transmission data.After DAC (207) sets Vref; Successively control the setting that I/O control module (206a) output control signal is accomplished the gain G 2 of differential amplifier B (208), control internal timing module (206b) the timing T of unit and unit interval T loop current change limitation compare threshold △ IS successively by processor module (206c) among the main control unit MCU (206), the value of △ IS is deposited among the register B (206e).Differential amplifier A (203) output terminal and baseline threshold voltage Vref are connected respectively to the 1st, 2 input ports of differential amplifier B (208) then; This moment, differential amplifier A (203) output end voltage was that the voltage at sample resistance R (202) two ends is real-time pressure reduction V1, can obtain the real-time current in the loop through I=V1/ (R*G1).Differential amplifier B (208) output end voltage △ V is through the real-time current variable quantity △ I after the baric flow conversion.Processor module (206c) is controlled its I/O control module (206a) output control signal control multi-channel gating device MUX (204) state among the MCU (206); Voltage △ V is delivered among the data acquisition unit ADC (205); ADC (205) sends into main control unit MCU (206) with the data of gathering with the form of ASII code, in processor module, passes through software reduction △ I numerical value: △ I=△ V/ (R*G1*G2), and the loop current change limitation compare threshold △ IS that presets that △ I numerical value is stored in register B (206e) is compared; When △ I overshoot threshold value; The determination circuit current stability does not meet the demands, and then controls its I/O control module (206a) output control signal by processor module (206c) among the MCU (206) earlier, at first makes circuit switching SW (201) be in off-state; The cut-off loop current path; Control display unit DIS (209) output sound and light alarm information then, the detection system outage detects and finishes.If the loop current change limitation compare threshold value △ IS that △ I numerical value and MCU preset compares,, △ I stipulates then to detect to proceed when satisfying.
The present invention has adopted the electric current initial value is carried out the baric flow conversion and is set at feedback threshold voltage; Carrying out current stability with the method for real-time acquired signal difference amplification then detects; This method is the removal system interference of noise effectively, accurately detects the small variation of electric current.This method applied range implementation cost is low and generality of hardware is strong.
Claims (1)
1. a current stability pick-up unit is characterized in that: be made up of sample resistance, differential amplifier A, differential amplifier B, multi-channel gating device MUX, data acquisition unit ADC, D/A conversion unit DAC, main control unit MCU and display unit;
It is voltage that sample resistance R is serially connected in the current return current conversion to be measured, and voltage is outputed to the input end of differential amplifier A;
The gating switch of main control unit MCU control multi-channel gating device MUX makes the output of differential amplifier A directly give gate MUX or be connected to differential amplifier B;
The input end of multi-channel gating device MUX receives the output signal from differential amplifier A or differential amplifier B, directly gives data acquisition unit ADC;
Data acquisition unit ADC will send into main control unit MCU with the form of ASII code from the signal that multi-channel gating device MUX obtains;
D/A conversion unit DAC accepts the data from main control unit MCU and converts simulating signal to give differential amplifier B;
Main control unit MCU receives the data that data acquisition unit ADC sends here, and outputs to D/A conversion unit DAC through software processes, or gives circuit switching SW or give display unit.
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| CN2011102532606A CN102393484A (en) | 2011-08-31 | 2011-08-31 | Device for detecting stability of current |
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| CN2011102532606A CN102393484A (en) | 2011-08-31 | 2011-08-31 | Device for detecting stability of current |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102681531A (en) * | 2012-05-10 | 2012-09-19 | 四川金网通电子科技有限公司 | Method for implementing self-calibration of current-limiting current value of motor controller |
| CN103374959A (en) * | 2012-04-23 | 2013-10-30 | 广东恒洁卫浴有限公司 | Invisible-rim veneering potty washing basin |
| CN103472286A (en) * | 2013-09-30 | 2013-12-25 | 常熟市明阳电器安装工程有限公司 | Electrical appliance abnormal voltage monitoring system |
| CN103472285A (en) * | 2013-09-30 | 2013-12-25 | 常熟市明阳电器安装工程有限公司 | Electrical appliance abnormal current detector |
| CN103487639A (en) * | 2012-06-07 | 2014-01-01 | 亚旭电脑股份有限公司 | Current measuring system |
| CN103543319A (en) * | 2013-09-06 | 2014-01-29 | 国家电网公司 | High-precision fast measuring circuit and method for wide-range currents in power system |
| CN106199162A (en) * | 2015-05-08 | 2016-12-07 | 中兴通讯股份有限公司 | The testing circuit of a kind of high-side current and detection method |
| CN107064611A (en) * | 2017-02-24 | 2017-08-18 | 北京深思数盾科技股份有限公司 | A kind of creepage detection method and device |
| CN107179471A (en) * | 2017-05-26 | 2017-09-19 | 云南电网有限责任公司电力科学研究院 | Bus plug-in unit method of testing between a kind of plate |
| CN108226620A (en) * | 2016-12-22 | 2018-06-29 | 航天信息股份有限公司 | A kind of voltage sensor signal conditioning circuit |
| CN109471012A (en) * | 2018-10-23 | 2019-03-15 | 浙江慧控科技有限公司 | Circuit for checking input signals and method in universal input circuit |
| CN110441043A (en) * | 2019-08-15 | 2019-11-12 | 西京学院 | A kind of electric lock screw tool stripped thread detection system and method based on motor characteristic |
| CN111239476A (en) * | 2018-11-29 | 2020-06-05 | 瑞昱半导体股份有限公司 | Signal detector and signal detection method |
| WO2020206411A1 (en) * | 2019-04-05 | 2020-10-08 | Texas Instruments Incorporated | Dynamic security protection in configurable analog signal chain |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103374959A (en) * | 2012-04-23 | 2013-10-30 | 广东恒洁卫浴有限公司 | Invisible-rim veneering potty washing basin |
| CN102681531A (en) * | 2012-05-10 | 2012-09-19 | 四川金网通电子科技有限公司 | Method for implementing self-calibration of current-limiting current value of motor controller |
| CN102681531B (en) * | 2012-05-10 | 2014-02-05 | 四川金网通电子科技有限公司 | Method for implementing self-calibration of current-limiting current value of motor controller |
| CN103487639A (en) * | 2012-06-07 | 2014-01-01 | 亚旭电脑股份有限公司 | Current measuring system |
| CN103543319A (en) * | 2013-09-06 | 2014-01-29 | 国家电网公司 | High-precision fast measuring circuit and method for wide-range currents in power system |
| CN103543319B (en) * | 2013-09-06 | 2016-06-15 | 国家电网公司 | The measuring method of the high-precision rapid survey circuit of power system inner width range current |
| CN103472286A (en) * | 2013-09-30 | 2013-12-25 | 常熟市明阳电器安装工程有限公司 | Electrical appliance abnormal voltage monitoring system |
| CN103472285A (en) * | 2013-09-30 | 2013-12-25 | 常熟市明阳电器安装工程有限公司 | Electrical appliance abnormal current detector |
| CN106199162A (en) * | 2015-05-08 | 2016-12-07 | 中兴通讯股份有限公司 | The testing circuit of a kind of high-side current and detection method |
| CN108226620A (en) * | 2016-12-22 | 2018-06-29 | 航天信息股份有限公司 | A kind of voltage sensor signal conditioning circuit |
| CN107064611A (en) * | 2017-02-24 | 2017-08-18 | 北京深思数盾科技股份有限公司 | A kind of creepage detection method and device |
| CN107179471A (en) * | 2017-05-26 | 2017-09-19 | 云南电网有限责任公司电力科学研究院 | Bus plug-in unit method of testing between a kind of plate |
| CN109471012A (en) * | 2018-10-23 | 2019-03-15 | 浙江慧控科技有限公司 | Circuit for checking input signals and method in universal input circuit |
| CN111239476A (en) * | 2018-11-29 | 2020-06-05 | 瑞昱半导体股份有限公司 | Signal detector and signal detection method |
| CN111239476B (en) * | 2018-11-29 | 2022-11-22 | 瑞昱半导体股份有限公司 | Signal detector and signal detection method |
| WO2020206411A1 (en) * | 2019-04-05 | 2020-10-08 | Texas Instruments Incorporated | Dynamic security protection in configurable analog signal chain |
| US10935600B2 (en) | 2019-04-05 | 2021-03-02 | Texas Instruments Incorporated | Dynamic security protection in configurable analog signal chains |
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| CN110441043A (en) * | 2019-08-15 | 2019-11-12 | 西京学院 | A kind of electric lock screw tool stripped thread detection system and method based on motor characteristic |
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Application publication date: 20120328 |