CN202661573U - Capacitance and inductance measurement circuit - Google Patents
Capacitance and inductance measurement circuit Download PDFInfo
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- CN202661573U CN202661573U CN 201220337985 CN201220337985U CN202661573U CN 202661573 U CN202661573 U CN 202661573U CN 201220337985 CN201220337985 CN 201220337985 CN 201220337985 U CN201220337985 U CN 201220337985U CN 202661573 U CN202661573 U CN 202661573U
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Abstract
The utility model relates to a capacitance and inductance measurement circuit which comprises a signal source circuit, and a virtual/actual part separation circuit connected with the signal source circuit, wherein the virtual/actual part separation circuit is sequentially connected with a singlechip through an analog switch and an analog/digital converter; the singlechip is connected with a keyboard; and a signal modulation circuit is arranged between the signal source circuit and the virtual/actual part separation circuit. The capacitance and inductance measurement circuit has the advantages of high precision, low cost and rapid and automatic measurement, so that the performances of a capacitor and an inductor can be rapidly and accurately judged.
Description
Technical field
The utility model relates to measuring technique, is specifically related to a kind of capacitor and inductance measurement circuit.
Background technology
Capacitor and inductor are the basic electronic devices and components that form various circuit, the every field of various circuit application in commercial production that forms, the quality of its performance has determined the quality of circuit various functions, is very important to the judgement of capacitor and inductor performance therefore.
The major parameter of capacitor has electric capacity and error thereof, rated voltage, temperature coefficient, loss factor etc., and what need in the practical application to measure is electric capacity and loss factor; The major parameter of inductor has inductance value and error thereof, rated current, temperature coefficient, quality factor etc., and what need in the practical application to measure is inductance value and quality factor.At present, the measuring instrument of capacitor and inductor alternating-current parameter being measured mainly contains traditional analog formula and digital intellectualization two classes.
Traditional analog formula measuring instrument ubiquity measuring accuracy is not high, easily be disturbed, complex operation, can not realize the shortcomings such as fast automatic measurement, progressively replaced by novel digital intellectualization measuring instrument.In the digital intellectualization measuring instrument on the market, high expensive of precision, the precision that price is low is inadequate.
The utility model content
The technical solution of the utility model is: a kind of capacitor and inductance measurement circuit, comprise signal source circuit, and the actual situation that is connected with signal source circuit part is from circuit, described actual situation part is passed through analog switch successively from circuit, AD converter is connected with single-chip microcomputer, described single-chip microcomputer also is connected with a keyboard, and described signal source circuit and actual situation part are from also being provided with signal modulation circuit between the circuit.
Above-mentioned a kind of capacitor and inductance measurement circuit, described single-chip microcomputer also is connected with display circuit.
Above-mentioned a kind of capacitor and inductance measurement circuit, described single-chip microcomputer also is connected with the serial communication interface.
Above-mentioned a kind of capacitor and inductance measurement circuit, described single-chip microcomputer model is STC89C52.
Above-mentioned a kind of capacitor and inductance measurement circuit, described signal source circuit is to actual situation section input reference sine wave and cosine wave signal, and the voltage signal that contains testing capacitance or inductance alternating-current parameter of process signal modulation circuit modulation, real part voltage signal after actual situation section will separate and solid part signal are successively through analog switch, and AD converter is sent into single-chip microcomputer.
Above-mentioned a kind of capacitor and inductance measurement circuit, described signal source circuit comprises metering circuit, and is respectively metering circuit and actual situation part provides reference sine wave and cosine wave signal from circuit 10kHz signal source.
The utility model possesses the advantage of high precision, low cost, measuring quickly and automatically, can make fast and accurately judgement to capacitor and inductor performance.
Description of drawings
Fig. 1 is capacitive measuring principle figure.
Fig. 2 is the inductance measurement schematic diagram.
Fig. 3 is one-piece construction structural representation block diagram
Fig. 4 is 10kHz signal source circuit figure.
Fig. 5 is metering circuit.
Fig. 6 is that the actual situation part is from circuit diagram.
Fig. 7 is AD conversion and main controller circuit figure.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Be the used capacitive measuring principle figure of the utility model as shown in Figure 1, the signal source sinusoidal signal can be expressed as:
Testing capacitance is introduced in the metering circuit anti-phase ratio amplifier output end voltage
Can be expressed as:
From circuit, can obtain real part voltage U 1 and imaginary part voltage U 2 by the actual situation part, can be expressed as;
As calculated, loss factor D can be expressed as:
Be the used inductance measurement schematic diagram of the utility model as shown in Figure 2, inductance to be measured introduced in the metering circuit anti-phase ratio amplifier output end voltage
Can be expressed as:
In like manner can get real part voltage U 1 and imaginary part voltage U 2, can be expressed as:
As calculated, quality factor q can be expressed as:
The utility model one-piece construction schematic diagram as shown in Figure 3, capacitor and inductor need to be measured under the 10kHz sinusoidal signal, therefore measuring system needs the 10kHz signal generator to provide reference sine wave and cosine wave signal to metering circuit and actual situation part from circuit, through the voltage signal that contains testing capacitance or inductance alternating-current parameter of metering circuit modulation
Send into simultaneously the actual situation part from circuit with cosine and sine signal for reference, can be with modulation signal
Be separated into the real part voltage U
1With the imaginary part voltage U
2, the gating of process analog switch is sent into respectively and is converted digital quantity in the A/D converter to, by single-chip microcomputer STC89C52 these digital quantities is carried out analytical calculation, and measurement result is shown by display circuit.Keyboard is used for the State selective measurements range, simultaneously control simulation switching gate and return information initiating terminal.Serial communication circuit is used for realizing the communication of host computer and slave computer, can also can transfer data to host computer from slave computer by serial communication circuit from the host computer slave computer that downloads, and processes by software at host computer.Signal source circuit is to actual situation section input reference sine wave and cosine wave signal, and the voltage signal that contains testing capacitance or inductance alternating-current parameter of process signal modulation circuit modulation, real part voltage signal after actual situation section will separate and solid part signal are successively through analog switch, and AD converter is sent into single-chip microcomputer.
10kHz signal source circuit figure as shown in Figure 4,10kHz signal source circuit adopt EPROM (M27C256) and DA converter (DAC0832) to finish.Produce synchronously 10kHz standard sine and cosine signal by this circuit.Its principle of work is as follows: EPROM is used for storing sine or 100 sampling point informations of cosine signal, carry out addressing by the 1MHz pulse, the sexadecimal information of 100 sampled points is sent into the DA change-over circuit, export corresponding analog sine or cosine signal through conversion by LF356.
The utility model metering circuit as shown in Figure 5, this main circuit will be comprised of anti-phase computing circuit and the relay that integrated transporting discharging LF356 consists of.The correlation parameter of testing capacitance or inductance can be modulated into voltage signal by this circuit, realize electric capacity (inductance) voltage transitions.Its principle of work is as follows: testing capacitance or inductance are put into capacitor and inductor detection head place, when relay K 2 is positioned at normally opened contact, when K4 is positioned at normally closed contact, carry out inductance measurement.When relay K 2 is positioned at normally closed contact, when K4 is positioned at normally opened contact, carry out capacitance measurement.K1 and K3 are used for selecting range ability.Modulated voltage signal is exported by the integrated transporting discharging output terminal.
The utility model actual situation part as shown in Figure 6 is from circuit diagram, and circuit is made of AD633 multiplier and low-pass filter.Its principle of work is as follows: the voltage signal of metering circuit output is sent in the multiplier, multiplied each other with 10kHz standard sine and cosine reference signal respectively, multiplier output obtains respectively real part and imaginary part voltage by low-pass filtering.
AD conversion and main controller circuit figure as shown in Figure 7, imaginary part and real part voltage are sent into respectively AD converter by analog switch and are carried out analog to digital conversion, and the digital signal that obtains is sent into single-chip microcomputer and is processed calculating.AD converter adopts ICL7135, and wherein MC1403 provides the voltage reference of 1V for ICL7135, and ICL7660 provides-the 5V operating voltage for ICL7135.Single-chip microcomputer is the control core of whole measuring instrument, requires and overall performance according to measuring, and such as arithmetic speed, antijamming capability, I/O port, interrupt source, memory capacity, cost performance etc., adopts the STC89C52 of superior performance as processor.Adopt the serial transmission mode between ICL7135 and the single-chip microcomputer, this mode is to obtain to measure transformation result by the method for counting umber of pulse.Mainly be that the BUSY port of ICL7135 and the INT0 port of single-chip microcomputer are coupled together, the CLK port of ICL7135 and the T0 mouth of single-chip microcomputer couple together, and the timer T0 by single-chip microcomputer counts umber of pulse.Because the CLK frequency that timer T0 is used is identical with the CLK frequency of ICL7135.Therefore can utilize the 2MHz ALE square-wave signal of single-chip microcomputer to carry out 16 frequency divisions obtains the 125kHz square-wave signal and inputs as pulse (CLK) input and the T0 pulse of ICL7135.So far, the step-by-step counting of T0 just reflects the digital conversion results of ICL7135.Count pulse and the required impulsive synchronization of ICL7135 work in order to make timer T0 can be connected to the BUSY signal of ICL7135 on P3.2 (INT0) pin of STC89C52, and the gating control signal GATE of timer T0 is put 1.Whether timer T0 worked and will be subjected to the control of BUSY signal this moment.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (6)
1. capacitor and inductance measurement circuit, it is characterized in that: comprise signal source circuit, and the actual situation that is connected with signal source circuit part is from circuit, described actual situation part is passed through analog switch successively from circuit, AD converter is connected with single-chip microcomputer, described single-chip microcomputer also is connected with a keyboard, and described signal source circuit and actual situation part are from also being provided with signal modulation circuit between the circuit.
2. a kind of capacitor and inductance measurement circuit according to claim 1, it is characterized in that: described single-chip microcomputer also is connected with display circuit.
3. a kind of capacitor and inductance measurement circuit according to claim 1, it is characterized in that: described single-chip microcomputer also is connected with the serial communication interface.
4. a kind of capacitor and inductance measurement circuit according to claim 1, it is characterized in that: described single-chip microcomputer model is STC89C52.
5. each described a kind of capacitor and inductance measurement circuit according to claim 1-4, it is characterized in that: described signal source circuit is to actual situation section input reference sine wave and cosine wave signal, and the voltage signal that contains testing capacitance or inductance alternating-current parameter of process signal modulation circuit modulation, real part voltage signal after actual situation section will separate and solid part signal are successively through analog switch, and AD converter is sent into single-chip microcomputer.
6. each described a kind of capacitor and inductance measurement circuit according to claim 1-4, it is characterized in that: described signal source circuit comprises metering circuit, and is respectively metering circuit and actual situation part provides reference sine wave and cosine wave signal from circuit 10kHz signal source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220337985 CN202661573U (en) | 2012-07-13 | 2012-07-13 | Capacitance and inductance measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220337985 CN202661573U (en) | 2012-07-13 | 2012-07-13 | Capacitance and inductance measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202661573U true CN202661573U (en) | 2013-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220337985 Expired - Fee Related CN202661573U (en) | 2012-07-13 | 2012-07-13 | Capacitance and inductance measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202661573U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247191A (en) * | 2017-06-18 | 2017-10-13 | 丹凤县鑫伟电子有限公司 | A kind of inductance measurement method |
| CN107727940A (en) * | 2017-12-01 | 2018-02-23 | 北京航天试验技术研究所 | A kind of portable tiny capacitance instrument |
| CN107727938A (en) * | 2017-08-31 | 2018-02-23 | 广西电网有限责任公司电力科学研究院 | Capacitive/inductive automatically adjusts frequency conversion measurement apparatus and its measuring method |
-
2012
- 2012-07-13 CN CN 201220337985 patent/CN202661573U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247191A (en) * | 2017-06-18 | 2017-10-13 | 丹凤县鑫伟电子有限公司 | A kind of inductance measurement method |
| CN107727938A (en) * | 2017-08-31 | 2018-02-23 | 广西电网有限责任公司电力科学研究院 | Capacitive/inductive automatically adjusts frequency conversion measurement apparatus and its measuring method |
| CN107727940A (en) * | 2017-12-01 | 2018-02-23 | 北京航天试验技术研究所 | A kind of portable tiny capacitance instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20140713 |
|
| EXPY | Termination of patent right or utility model |