CN101359010A - Measuring device for inductance value of printing inductor - Google Patents
Measuring device for inductance value of printing inductor Download PDFInfo
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- CN101359010A CN101359010A CNA2008100423157A CN200810042315A CN101359010A CN 101359010 A CN101359010 A CN 101359010A CN A2008100423157 A CNA2008100423157 A CN A2008100423157A CN 200810042315 A CN200810042315 A CN 200810042315A CN 101359010 A CN101359010 A CN 101359010A
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- inductance
- data processor
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- frequency generator
- analog switch
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Abstract
The present invention relates to the technical field of the measurement of parameters of the electronic component, in particular to the measuring device of the inductance value of the printed inductor, and a measurement method thereof. Because of the structural complexity of the spiral inductor, in particular for the rapid measurement of a PCB with a plurality of coils, the conventional method can not perform the measurement. The invention adopts the principle that the single chip is used for measuring the frequency of the LC oscillation loop, and then the corresponding inductance is calculated according to the oscillation frequency. In order to improve the accuracy, the invention adopts the Study-Measurement mode: the known standard inductance L0 is used as a benchmark to measure the oscillator frequency F0; the F0 is used as a benchmark, and the detected inductance is calculated by the computer according to the calculation formulas of the inductance and the capacitance. The device comprises a frequency generator 1, a data processor 2, an auxiliary electronic component connecting component 3 which is connected with the detected printing inductor printing through electrical signals, a host computer and so on. The device has the advantage of simply and rapidly detecting the inductance of the electric apparatuses.
Description
Technical field
The present invention relates to the field of measuring technique of electronic devices and components parameter, specifically refer to the pick-up unit and the measuring method thereof of the inductance value deviation that a kind of short circuit that causes because of manufacture craft for printed sensors and open circuit cause.
Background technology
So that it is shaped as spiral helicine mode on plan view, spiral inductor L that on Semiconductor substrate or printed-wiring board (PWB) metal line is set and forms and variable condenser C form lc circuit and produce the wave of oscillation, in RF (radio frequency) analog device or high-speed figure device, as being widely adopted in voltage-controlled oscillator (VCO) and PLL (phaselocked loop) link etc.
Because of the complicacy of spiral inductor structure,, multiple measuring method had been proposed for detecting its inductance value.For example: patent documentation 1 (spy opens hurdle, 2000-28662 communique the 7th hurdle-the 9th), disclose a kind ofly, obtained the inductance value and the resistance value of spiral inductor by the Smith curve map by to being measured reflection coefficient by the scattering parameter (S parameter) that combines the defined matrix of the incident wave of spiral inductor and reflection wave.And for example, patent documentation 2 (spy opens hurdle, 2-300670 communique the 4th hurdle-the 6th) discloses and has flow through variable current with measuring voltage on inductor, calculates the method for inductance value etc. according to magnitude of voltage.Really can measure some printed sensors with these methods or commercially available inductance apparatus, but work efficiency is extremely low, because the existence of measuring lead wire makes measuring error increase, the interference that the parasitic elements that electromagnetic induction forms produces also makes to disturb and increases.Just seem powerless for the quick measurement of requirement that tens inductance are arranged on the PCB.
Summary of the invention
Purpose of the present invention is for solving the disappearance that above-mentioned prior art exists, and propose a kind of simple and easy, be used for the measurement mechanism and the method thereof of printed sensors inductance value fast.The principle of this programme is to adopt the frequency of single chip computer measurement LC oscillation circuit, calculates corresponding inductance value according to oscillation frequency then.Be to improve measuring accuracy, the present invention has adopted " study-measurement " pattern, is benchmark with a known standard inductance L0 promptly, measuring oscillator frequency F0, and be benchmark with this F0, press inductance, electric capacity computing formula again:
Method carry out " study-measurement ", finish until detection.
As shown from the above formula, square being directly proportional of inductance value and frequency, i.e. square being directly proportional of the variation of inductance value and frequency change.The present invention promptly comes the slight change of indirect inductance measuring by the variation that detects frequency.Wherein, core circuit is to adopt common voltage comparator, and it and L1C0 connect to form oscillator.By measuring principle as can be known circuit the precision of C0 is not had strict requirement, but standard inductance L0 is accurate as much as possible.After the oscillator work, the frequency F1 that oscillation frequency obtains behind 16 frequency divisions by frequency divider, single-chip microcomputer is measured this frequency and it is transferred to host computer in real time, finally carries out computational analysis by upper computer software, obtains the result that inductance detects.
Apparatus of the present invention mainly comprise:
Constituted with being connected of electric signal with tested printed sensors and host computer by a frequency generator, data processor and auxiliary electron link.
Wherein, described frequency generator is that a voltage comparator LM311 and L1C0 connect into oscillator and connect to form with standard C 0, standard inductance L0, does being connected of electric signal with data processor by frequency divider behind 16 frequency divisions; And be connected with data transmission with host computer;
Described data processor is a single chip processing module and connects as follows: have 15 pin-22 pin of at least 2 analog switch ADG732 that are connected with tested inductor to link to each other with Chip Microcomputer A tmel-mega32 port pinout respectively, by the mode of operation of Single-chip Controlling analog switch ADG732.All control break-make pins of analog switch ADG732 all can be connected (comprising a standard printed sensors) with printed sensors, all inductors are connected with frequency generator, only there is 1 printed sensors to keep channel status but data processor must be controlled analog switch ADG732 synchronization, keeps other printed sensors to keep off state simultaneously.The frequency generator output terminal links to each other with the data processor input port, and frequency signal is passed through this path by the frequency generator Input Data Process.Auxiliary electron partly is divided into power module and communication interface two large divisions, power module is connected respectively to the power supply port of frequency generator and data processor, for two big modules provide power supply, in this programme, adopt LM7805 level chip to provide direct supply for system.Communication interface connects data processor and PC respectively, in this programme, adopts chip MX232 as communication interface chip, and communication protocol adopts the asynchronous serial host-host protocol.The power module of auxiliary electron part provides constant DC source for frequency generator, guarantees the operate as normal of frequency generator.
The frequency generator of any other principle satisfies inductance value and influence the frequency generator of frequency values all can replace the LM311 frequency generator circuit, and the LM311 frequency generator circuit only is a kind of selection scheme in this measurement mechanism.
The analog switch that described and tested inductance is connected is provided with and can connects 80 at most;
The measuring method of described device is:
Pass through serial port Data transmission and order between host computer and the data processor;
After single-chip microcomputer received initiation command, single-chip microcomputer was by the break-make of pc port control analog switch, and synchronization guarantees only have a passage to open, and measuring an inductance time is 100 milliseconds;
Analog switch is initialized as standard inductance to begin to measure;
Through analog switch successively all inductance are all measured finish after, send data by serial port of single chip computer to host computer, make the inductance numerical value that further computing detects until output.
Description of drawings
Fig. 1 connects block diagram for the measurement mechanism module of a kind of printed sensors inductance value of the present invention;
Fig. 2 is the measurement mechanism core circuit figure of a kind of printed sensors inductance value of the present invention;
Fig. 3 is the measurement FB(flow block) of a kind of printed sensors inductance value of the present invention.
Embodiment
Be further described below in conjunction with the measurement mechanism of accompanying drawing a kind of printed sensors inductance value of the present invention:
As previously mentioned, main technical principle of the present invention is: will be converted to frequency measurement to inductance measurement, and by implementing " study, relatively " to the benchmark inductance, and then measure the pattern of unknown inductance, and finish by system and device as shown in Figure 1.
The measurement mechanism of a kind of printed sensors inductance value of the present invention is made of with being connected of electric signal with tested printed sensors and host computer a frequency generator 1, data processor 2 and auxiliary electron link 3.
Described frequency generator 1 is that a voltage comparator LM311 and L1C0 connect into oscillator and connect to form with standard C 0, standard inductance L0, by frequency divider behind 16 frequency divisions, output terminal links to each other with data processor 2 input ends, and frequency signal is by this circuit output; Frequency generator 1 and analog switch control printed sensors down is connected, and forms loop state by 1 printed sensors and frequency generator again and only in the synchronization assurance, and all the other printed sensors to be measured all keep open-circuit condition.
The frequency generator of any other principle satisfies inductance value and influence the frequency generator of frequency values all can replace the LM311 frequency generator circuit, and the LM311 frequency generator circuit only is a kind of selection scheme in this measurement mechanism.
Described data processor 2 is a single chip processing module, and this programme adopts Atmel-mega32 as core processor, and connects as follows:
There is 15 pin-22 pin of at least 2 analog switch ADG732 that are connected with tested inductor to link to each other with Chip Microcomputer A tmel-mega32 port pinout respectively, by the mode of operation of Single-chip Controlling analog switch ADG732;
All control break-make pins of analog switch ADG732 all can be connected (comprising a standard printed sensors) with printed sensors, all inductance are connected with frequency generator 1, only there is 1 printed sensors to keep channel status but data processor 1 must be controlled analog switch ADG732 synchronization, keeps other printed sensors to keep off state simultaneously;
Frequency generator 1 output terminal links to each other with data processor 2 input ports, and frequency signal is passed through this path by frequency generator 1 Input Data Process 2;
Communication interface connects data processor 2 and PC respectively, in this programme, adopts chip MX232 as communication interface chip, and communication protocol adopts the asynchronous serial host-host protocol;
The analog switch that described and tested inductance is connected is provided with and can connects 80 at most.
The measuring method of device of the present invention is:
Pass through serial port Data transmission and order between host computer and the data processor;
After single-chip microcomputer received initiation command, single-chip microcomputer was by the break-make of pc port control analog switch, and synchronization guarantees only have a passage to open, and measuring an inductance time is 100 milliseconds;
Analog switch is initialized as standard inductance to begin to measure;
Through analog switch successively all inductance are all measured finish after, send data by serial port of single chip computer to host computer, do further computing.
In sum,, in measuring process, overcome factor especially, improved precision the inductance measuring value because of the influence of environmental noise measuring accuracy to the high-frequency band more than the 1GHZ by inductance measuring system and device of the present invention.And can increase in interpolation analog switch quantity and measure the printed sensors number.
Claims (3)
1, a kind of measurement mechanism of printed sensors inductance value is characterized in that, is made of with being connected of electric signal with tested printed sensors and host computer a frequency generator (1), data processor (2), auxiliary electron link (3).
2, the measurement mechanism of a kind of printed sensors inductance value as claimed in claim 1, it is characterized in that, described frequency generator (1) is that a voltage comparator LM311 and L1C0 connect into oscillator and connect to form with standard C 0, standard inductance L0, does being connected of electric signal with data processor (2) and be connected with data transmission with host computer behind 16 frequency divisions by frequency divider;
Described data processor (2) is the single chip processing module of an Atmel-mega32 as core processor, and connects as follows:
There is 15 pin-22 pin of at least 2 analog switch ADG732 that are connected with tested inductor to link to each other with the Atmel-mega32 port pinout respectively;
All control break-make pins of ADG732 all are connected with the printed sensors that comprises a standard printed sensors L0, and all inductors are connected with frequency generator (1);
Frequency generator (1) output terminal links to each other with data processor (2) input port;
Described auxiliary electron part (3) is made up of as the communication interface of acp chip as the power module and the MAX232 of acp chip LM7805, and LM7805 is connected respectively to the power supply port of frequency generator (1) and data processor (2);
MAX232 transfers to data processor (2) and PC with asynchronous serial;
The analog switch that described and tested inductance is connected is provided with and can connects 80 at most.
3, want the measuring method of device as described in 1 as right, it is characterized in that: pass through serial port Data transmission and order between host computer and the data processor;
After single-chip microcomputer received initiation command, single-chip microcomputer was by the break-make of pc port control analog switch, and synchronization guarantees only have a passage to open, and measuring an inductance time is 100 milliseconds;
Analog switch is initialized as standard inductance to begin to measure;
Through analog switch successively all inductance are all measured finish after, send data by serial port of single chip computer to host computer, do further computing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100423157A CN101359010B (en) | 2008-08-29 | 2008-08-29 | Measuring device for inductance value of printing inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100423157A CN101359010B (en) | 2008-08-29 | 2008-08-29 | Measuring device for inductance value of printing inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101359010A true CN101359010A (en) | 2009-02-04 |
| CN101359010B CN101359010B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100423157A Expired - Fee Related CN101359010B (en) | 2008-08-29 | 2008-08-29 | Measuring device for inductance value of printing inductor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777082A (en) * | 2014-01-03 | 2014-05-07 | 浙江大学 | Digital display inductance parameter test device |
| CN106950432A (en) * | 2017-05-04 | 2017-07-14 | 北京华垚高新技术研究所有限公司 | The multi-frequency inductance measurement method and circuit of a kind of long wire of earth's surface |
| CN107037267A (en) * | 2017-06-17 | 2017-08-11 | 丹凤县荣毅电子有限公司 | A kind of inductance detection device and detection method |
| CN108982972A (en) * | 2018-08-22 | 2018-12-11 | 西安飞芯电子科技有限公司 | A kind of micro- inductance measurement method and apparatus |
-
2008
- 2008-08-29 CN CN2008100423157A patent/CN101359010B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777082A (en) * | 2014-01-03 | 2014-05-07 | 浙江大学 | Digital display inductance parameter test device |
| CN106950432A (en) * | 2017-05-04 | 2017-07-14 | 北京华垚高新技术研究所有限公司 | The multi-frequency inductance measurement method and circuit of a kind of long wire of earth's surface |
| CN107037267A (en) * | 2017-06-17 | 2017-08-11 | 丹凤县荣毅电子有限公司 | A kind of inductance detection device and detection method |
| CN107037267B (en) * | 2017-06-17 | 2019-03-22 | 丹凤县荣毅电子有限公司 | A kind of inductance detection method |
| CN108982972A (en) * | 2018-08-22 | 2018-12-11 | 西安飞芯电子科技有限公司 | A kind of micro- inductance measurement method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101359010B (en) | 2012-07-04 |
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