CN105634409A - Error detector for electronic watch - Google Patents
Error detector for electronic watch Download PDFInfo
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- CN105634409A CN105634409A CN201410653087.2A CN201410653087A CN105634409A CN 105634409 A CN105634409 A CN 105634409A CN 201410653087 A CN201410653087 A CN 201410653087A CN 105634409 A CN105634409 A CN 105634409A
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Abstract
The present invention discloses an error detector for an electronic watch, comprising an LC resonance circuit module, a low-noise amplification circuit, a band-pass filtering circuit, a secondary amplification circuit, a level converting circuit, a chopper, a frequency division circuit and a main controller; wherein the output end of the LC resonance circuit module is connected with the input end of the low-noise amplification circuit, the output end of the low-noise amplification circuit is connected with the input end of the band-pass filtering circuit, the output end of the band-pass filtering circuit is connected with the input end of the secondary amplification circuit, the output end of the secondary amplification circuit is connected with the input end of the level converting circuit, the output end of the level converting circuit is connected with the input end of the chopper, the output end of the chopper is connected with the input end of the frequency division circuit, the output end of the frequency division circuit is connected with the input end of the main controller, the input end of the main controller is also connected with a temperature compensating circuit, and the output end of the main controller is connected with a display. The error detector for the electronic watch is simple in structure, high in reliability and accuracy, and can quickly detect error parameters.
Description
Technical field
The invention belongs to electronic watch detection technique field, be specifically related to a kind of electronic watch error detector.
Background technology
Along with developing rapidly of electronic information technology and industry, the especially extensive use of Digital Electronic Technique, the market demand of electronic watch quickly increases, and the requirement of its performance is improved simultaneously. Countries in the world are all at the timekeeping performance of the accutron of research update method, and define a series of accuracy test and method of adjustment. The application of electronic watch error detector become must equipment, this instrument needs the very high electronic watch crystal frequency sensor of sensitivity and very high standard crystal. By detecting it appeared that accutron Problems existing, take different research approaches to improve for these problems, constantly improve accutron, make it equally better product.
Summary of the invention
It is an object of the invention to overcome above-mentioned deficiency of the prior art, it is provided that a kind of electronic watch error detector. This electronic watch error detector simple in construction, reliability is high, and precision is high, it may be achieved quickly detect error parameter, it is simple to promote the use of.
For achieving the above object, the technical solution used in the present invention is: electronic watch error detector, it is characterized in that: include the LC resonant tank module for the faint electromagnetic field signal of electronic watch being detected, for described electromagnetic field signal being carried out the low-noise amplification circuit of a processing and amplifying, for the described electromagnetic field signal of amplified process being filtered the bandwidth-limited circuit processed, for the described electromagnetic field signal of filtered process being carried out secondary processing and amplifying and obtaining the secondary amplifying circuit of sinusoidal signal of low noise, for the described sinusoidal signal obtained through secondary processing and amplifying is carried out level conversion to obtain the level shifting circuit of matching voltage, for level shifting circuit output voltage being converted to the chopper of square-wave signal, square-wave signal for being exported by chopper carries out the frequency dividing circuit of scaling down processing and is used for receiving frequency dividing circuit output signal and carrying out the master controller of computing, the outfan of described LC resonant tank module connects with the input of low-noise amplification circuit, the outfan of described low-noise amplification circuit connects with the input of bandwidth-limited circuit, the outfan of described bandwidth-limited circuit connects with the input of secondary amplifying circuit, the described outfan of secondary amplifying circuit connects with the input of level shifting circuit, the outfan of described level shifting circuit connects with the input of chopper, the outfan of described chopper connects with the input of frequency dividing circuit, the outfan of described frequency dividing circuit connects with the input of master controller, the input of described master controller is further connected with temperature-compensation circuit, the outfan of described master controller is further connected with the display for the result of master controller computing being shown.
Above-mentioned electronic watch error detector, it is characterised in that: described frequency dividing circuit is CPLD frequency dividing circuit.
Above-mentioned electronic watch error detector, it is characterised in that: described secondary amplifying circuit adopts low noise amplifier OPA300.
Above-mentioned electronic watch error detector, it is characterised in that: described master controller adopts MSP430F247.
Above-mentioned electronic watch error detector, it is characterised in that: described display adopts liquid crystal display.
The present invention compared with prior art has the advantage that
1, adopting technique for temperature compensation: measure the frequency-temperature characteristic of high frequency common crystals, namely the precise frequencies of this crystal oscillator at different temperatures, just can compensate this common crystals frequency so in a program.
2, frequency is accurate: adopt high integration, the field programmable gate array CPLD of high speed provides guarantee for realization high speed, high-precision frequency measurement.
3, visualization: by single-chip microcomputer the frequency recorded be calculated and show.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the present invention.
Description of reference numerals:
1 LC resonant tank module; 2 low-noise amplification circuit; 3 bandwidth-limited circuits;
No. 4 two amplifying circuits; 5 level shifting circuits; 6 choppers;
7 frequency dividing circuits; 8 display; 9 master controllers;
10 temperature-compensation circuits.
Detailed description of the invention
Electronic watch error detector as shown in Figure 1, including the LC resonant tank module 1 for the faint electromagnetic field signal of electronic watch being detected, for described electromagnetic field signal being carried out the low-noise amplification circuit 2 of a processing and amplifying, for the described electromagnetic field signal of amplified process being filtered the bandwidth-limited circuit 3 processed, for the described electromagnetic field signal of filtered process being carried out secondary processing and amplifying and obtaining the secondary amplifying circuit 4 of sinusoidal signal of low noise, for the described sinusoidal signal obtained through secondary processing and amplifying being carried out level conversion to obtain the level shifting circuit 5 of matching voltage, for level shifting circuit 5 output voltage being converted to the chopper 6 of square-wave signal, square-wave signal for being exported by chopper 6 carries out the frequency dividing circuit 7 of scaling down processing and is used for receiving frequency dividing circuit 7 and exports signal and carry out the master controller 9 of computing, the described outfan of LC resonant tank module 1 connects with the input of low-noise amplification circuit 2, the outfan of described low-noise amplification circuit 2 connects with the input of bandwidth-limited circuit 3, the outfan of described bandwidth-limited circuit 3 connects with the input of secondary amplifying circuit 4, the outfan of described secondary amplifying circuit 4 connects with the input of level shifting circuit 5, the outfan of described level shifting circuit 5 connects with the input of chopper 6, the outfan of described chopper 6 connects with the input of frequency dividing circuit 7, the outfan of described frequency dividing circuit 7 connects with the input of master controller 9, the input of described master controller 9 is further connected with temperature-compensation circuit 10, the outfan of described master controller 9 is further connected with the display 8 for the result of master controller 9 computing being shown.
In the present embodiment, described frequency dividing circuit 7 is CPLD frequency dividing circuit. Described secondary amplifying circuit 4 adopts low noise amplifier OPA300. Described master controller 9 adopts MSP430F247. Described display 8 adopts liquid crystal display.
The work process of the present invention is: gather faint electromagnetic field signal by LC resonant tank module 1, the low-noise amplification circuit 2 amplified through the first order adopts field effect transistor amplification circuit, adopt, for two grades of secondary amplifying circuits 4 amplified, this signal is amplified the sinusoidal signal obtaining low noise, obtain meeting the voltage of collection through level shifting circuit 5, output is to chopper 6, it is converted into square wave, after CPLD frequency dividing, coordinates master controller 9 to calculate output display result through temperature-compensating. Display circuit in rear end is preferably put in shielding box. Such front and back end circuit all different shieldings and in, therefore can the structure of reasonable design works, make the interference of whole circuit reach minimum.
In the present embodiment, owing to the frequency of its inside crystal oscillator is measured when not taking electronic watch apart, it is therefore desirable to go faradism sublist crystal oscillator to vibrate the weak electromagnetic field signal sent by LC resonant tank module 1 near electronic watch. In order to strengthen the intensity of induced signal, it is necessary at LC resonant tank module 1 two ends, a frequency in parallel is the crystal oscillator of 32768Hz. Owing to induced signal is very faint and is mingled with very strong noise, it is therefore desirable to take the measures such as amplification, filtering to carry out purified signal. Induced signal is very faint, for the first order amplify low-noise amplification circuit 2 adopt field effect transistor amplification circuit. In bandwidth-limited circuit 3, in view of needing to obtain very pure single frequency signal, used here as crystal oscillator series resonant circuit. Two crystal oscillators are together in series, and add LC antiresonant circuit between crystal oscillator and filter high-frequency signal. Owing to passive filter circuit has bigger loss, therefore needing again low noise to amplify after filtering, amplification reaches 300 times. Owing to back-end processing circuit needs input square-wave signal, therefore after two grades of amplifications, signal enters chopper 6, and sinusoidal signal is converted into square-wave signal. This electronic watch error detector adopts measuring period method indirectly to measure frequency, and periodic method needs CPLD to enter frequency dividing in measuring, finally calculated the cycle of crystal oscillation signal by single-chip microcomputer, and then draw phase frequency, just can measure afterwards a second error, day the parameter such as error.
The above; it it is only presently preferred embodiments of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure transformation above example made according to the technology of the present invention essence, all still fall within the protection domain of technical solution of the present invention.
Claims (5)
1. electronic watch error detector, it is characterized in that: include LC resonant tank module (1) for the faint electromagnetic field signal of electronic watch being detected, for described electromagnetic field signal being carried out the low-noise amplification circuit (2) of a processing and amplifying, for the described electromagnetic field signal of amplified process being filtered the bandwidth-limited circuit (3) processed, for the described electromagnetic field signal of filtered process being carried out secondary processing and amplifying and obtaining the secondary amplifying circuit (4) of sinusoidal signal of low noise, for the described sinusoidal signal obtained through secondary processing and amplifying being carried out level conversion to obtain the level shifting circuit (5) of matching voltage, for level shifting circuit (5) output voltage being converted to the chopper (6) of square-wave signal, for the square-wave signal that chopper (6) exports being carried out the frequency dividing circuit (7) of scaling down processing and being used for receiving frequency dividing circuit (7) output signal and carrying out the master controller (9) of computing, the outfan of described LC resonant tank module (1) connects with the input of low-noise amplification circuit (2), the outfan of described low-noise amplification circuit (2) connects with the input of bandwidth-limited circuit (3), the outfan of described bandwidth-limited circuit (3) connects with the input of secondary amplifying circuit (4), the outfan of described secondary amplifying circuit (4) connects with the input of level shifting circuit (5), the outfan of described level shifting circuit (5) connects with the input of chopper (6), the outfan of described chopper (6) connects with the input of frequency dividing circuit (7), the outfan of described frequency dividing circuit (7) connects with the input of master controller (9), the input of described master controller (9) is further connected with temperature-compensation circuit (10), the outfan of described master controller (9) is further connected with the display (8) for the result of master controller (9) computing being shown.
2. electronic watch error detector according to claim 1, it is characterised in that: described frequency dividing circuit (7) is CPLD frequency dividing circuit.
3. electronic watch error detector according to claim 1, it is characterised in that: described secondary amplifying circuit (4) adopts low noise amplifier OPA300.
4. electronic watch error detector according to claim 1, it is characterised in that: described master controller (9) adopts MSP430F247.
5. electronic watch error detector according to claim 1, it is characterised in that: described display (8) adopts liquid crystal display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410653087.2A CN105634409A (en) | 2014-11-16 | 2014-11-16 | Error detector for electronic watch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410653087.2A CN105634409A (en) | 2014-11-16 | 2014-11-16 | Error detector for electronic watch |
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| Publication Number | Publication Date |
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| CN105634409A true CN105634409A (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410653087.2A Pending CN105634409A (en) | 2014-11-16 | 2014-11-16 | Error detector for electronic watch |
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| CN (1) | CN105634409A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106503338A (en) * | 2016-10-24 | 2017-03-15 | 上海华力微电子有限公司 | The crystal oscillator resonant tank circuit of electromagnetism interference |
-
2014
- 2014-11-16 CN CN201410653087.2A patent/CN105634409A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106503338A (en) * | 2016-10-24 | 2017-03-15 | 上海华力微电子有限公司 | The crystal oscillator resonant tank circuit of electromagnetism interference |
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Application publication date: 20160601 |