CN205246094U - Quartz crystal sensor frequency conversion drive circuit - Google Patents
Quartz crystal sensor frequency conversion drive circuit Download PDFInfo
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- CN205246094U CN205246094U CN201521116454.1U CN201521116454U CN205246094U CN 205246094 U CN205246094 U CN 205246094U CN 201521116454 U CN201521116454 U CN 201521116454U CN 205246094 U CN205246094 U CN 205246094U
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- frequency
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Abstract
The utility model discloses a quartz crystal sensor frequency conversion drive circuit, including little the control unit, frequency synthesis unit, input unit and display element, frequency synthesis unit, input unit, display element all are connected with little the control unit electricity, the frequency synthesis unit includes frequency discriminator, a low pass filter, voltage controlled oscillator, first detector, the 2nd low pass filter and frequency divider. Quartz crystal sensor frequency conversion drive circuit produces the vibration through little the control unit control frequency synthesis unit drive quartz crystal, and input unit control little the control unit scan "Frequency" to show "Frequency" numerical value at display element, thereby can drive quartz crystal produces stable vibration, guarantees quartz crystal sensor measurements's accuracy.
Description
Technical field
The utility model relates to sensor technical field, relates in particular to a kind of quartz crystal sensor frequency conversion drive circuit.
Background technology
In recent years, quartz crystal sensor has obtained development fast as a kind of detecting instrument, is widely used in the fields such as medical diagnosis, military monitoring, environmental monitoring, food hygiene and industrial production Real-Time Monitoring. Its operation principle is that quartz crystal is through suitably cutting and be placed in testing medium, drive circuit drives quartz crystal to produce vibration, in the time that testing medium relevant parameter changes, its frequency of oscillation also changes thereupon, therefore the frequency of oscillation to quartz crystal is sampled, in conjunction with frequency, ambient parameter curve, can obtain testing medium related parameter values, as temperature, density, viscosity etc. But, there is oscillatory instability, the problem of failure of oscillation even, thereby cause quartz crystal sensor measure error larger, the problem that certainty of measurement is low in current drive circuit poor stability.
Utility model content
For above-mentioned technical problem, the purpose of this utility model is to provide a kind of quartz crystal sensor drive circuit, can drive quartz crystal to produce stable vibration, thereby ensures the accuracy that quartz crystal sensor is measured.
For reaching this object, the utility model by the following technical solutions:
A kind of quartz crystal sensor frequency conversion drive circuit, is characterized in that comprising: micro-control unit, frequency synthesis unit, input block and display unit;
Described micro-control unit is electrically connected with frequency synthesis unit, for controlled frequency synthesis unit;
The external quartz crystal in described frequency synthesis unit, for driving quartz crystal vibration according to the control instruction of micro-control unit;
Described input block is electrically connected with micro-control unit, carries out single step or cline frequency scanning for controlling micro-control unit;
Described display unit is electrically connected with micro-control unit, for showing the frequency of oscillation of quartz crystal sensor;
Described frequency synthesis unit comprises frequency discriminator, the first low pass filter, voltage controlled oscillator, frequency mixer, the second low pass filter and frequency divider, described frequency discriminator input connects micro-control unit, output is external quartz crystal after the first low pass filter and voltage controlled oscillator successively, and described voltage controlled oscillator output feeds back to frequency discriminator through frequency mixer, the second low pass filter and frequency divider successively.
Especially, described micro-control unit adopts 89S52 series monolithic.
Especially, described input block adopts keyboard.
Especially, described display unit adopts LCM141 liquid crystal display.
The quartz crystal sensor frequency conversion drive circuit the utility model proposes, produce vibration by micro-control unit controls frequency synthesis unit drives quartz crystal, input block control micro-control unit scans frequency of oscillation, and show frequency of oscillation numerical value at display unit, thereby can drive quartz crystal to produce stable vibration, ensure the accuracy that quartz crystal sensor is measured.
Brief description of the drawings
Fig. 1 is the quartz crystal sensor frequency conversion drive circuit structure block diagram that the utility model embodiment provides.
Fig. 2 is the quartz crystal sensor frequency synthesis element circuit structured flowchart that the utility model embodiment provides.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail. Be understandable that, specific embodiment described herein is only for explaining the utility model, but not to restriction of the present utility model. It also should be noted that, for convenience of description, in accompanying drawing, only show the part relevant to the utility model but not full content, unless otherwise defined, all technology that use are herein identical with the implication that belongs to the common understanding of those skilled in the art of the present utility model with scientific terminology. The term using in description of the present utility model herein, just in order to describe the object of specific embodiment, is not intended to be restriction the utility model. Term as used herein " and/or " comprise one or more relevant Listed Items arbitrarily with all combinations.
Embodiment mono-
Please refer to shown in Fig. 1 the quartz crystal sensor frequency conversion drive circuit structure block diagram that Fig. 1 provides for the utility model embodiment.
In the present embodiment, quartz crystal sensor drive circuit specifically comprises: micro-control unit 101, frequency synthesis unit 102, input block 103 and display unit 104.
Described micro-control unit 101 adopts 89S52 series monolithic, 89S52 grows up on the basis of 80C51, there is the singlechip chip of EEPROM in 8KB sheet, comprising one 8 is arithmetic logic unit, 32 I/O mouths, 4 groups of 8 separately addressable ports, 3 16 bit timing counters, 6 interrupt source, 2 interrupt priority levels, 256 byte built-in RAMs, independently 64K byte-addressable data and code area, and each 89S52 treatment cycle comprises 12 cycles of oscillation. Described micro-control unit 101 is electrically connected with frequency synthesis unit 102, sends the control instruction that drives quartz crystal vibration to frequency synthesis unit 102.
Please refer to shown in Fig. 2 the quartz crystal sensor frequency synthesis element circuit structured flowchart that Fig. 2 provides for the utility model embodiment.
Described frequency synthesis unit 102 comprises frequency discriminator 201, the first low pass filter 202, voltage controlled oscillator 203, frequency mixer 204, the second low pass filter 205 and frequency divider 206, described frequency discriminator 201 inputs connect micro-control unit 101, output is external quartz crystal after the first low pass filter 202 and voltage controlled oscillator 203 successively, and described voltage controlled oscillator 203 outputs feed back to frequency discriminator 201 through frequency mixer 204, the second low pass filter 205 and frequency divider 206 successively. Wherein, frequency discriminator 201 claims again phase comparator, phase difference between the signal that the control signal that detection micro-control unit 101 sends and frequency divider 206 feed back, and export this phase difference to the first low pass filter 202, filtered phase difference is controlled the frequency of voltage controlled oscillator 203 output signals. Meanwhile, the frequency of voltage controlled oscillator 203 output signals is done addition or subtraction through frequency mixer 204, and the signal after computing exports the second low pass filter 205 to and carries out filtering, and filtered signal feeds back to frequency discriminator 201 through frequency divider 206. Described frequency divider 206 adopts programmable frequency divider, can realize the frequency scanning under microcomputer control. The above-mentioned course of work forms closed-loop control, thereby frequency synthesis unit 102 output signal frequencies are locked as to micro-control unit 101 frequency input signals, and then ensure that frequency synthesis unit 102 drives quartz crystal to produce stable vibration according to the control instruction of micro-control unit 101.
Described input block 103 adopts keyboard, is connected with the P04 pin of 89S52 single-chip microcomputer, sends scan instruction to micro-control unit 101, controls micro-control unit 101 quartz crystal frequency of oscillation is carried out to single step scanning or continuous sweep.
Described output unit 104 adopts LCM141 liquid crystal display, be electrically connected with micro-control unit 101, be specially DATA, the WR of LCM1411 liquid crystal display, P20, P21, the P22 pin that CS pin connects respectively 89S52 single-chip microcomputer, show the frequency of oscillation of quartz crystal sensor.
The technical solution of the utility model produces vibration by micro-control unit controls frequency synthesis unit drives quartz crystal, input block control micro-control unit scans frequency of oscillation, and show frequency of oscillation numerical value at display unit, thereby can drive quartz crystal to produce stable vibration, ensure the accuracy that quartz crystal sensor is measured.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle. Skilled person in the art will appreciate that the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection domain of the present utility model. Therefore, although the utility model is described in further detail by above embodiment, but the utility model is not limited only to above embodiment, in the situation that not departing from the utility model design, can also comprise more other equivalent embodiment, and scope of the present utility model is determined by appended claim scope.
Claims (4)
1. a quartz crystal sensor frequency conversion drive circuit, is characterized in that comprising: micro-control unit, frequency synthesis unit, input block and display unit;
Described micro-control unit is electrically connected with frequency synthesis unit, for controlled frequency synthesis unit;
The external quartz crystal in described frequency synthesis unit, for driving quartz crystal vibration according to the control instruction of micro-control unit;
Described input block is electrically connected with micro-control unit, carries out single step or cline frequency scanning for controlling micro-control unit;
Described display unit is electrically connected with micro-control unit, for showing the frequency of oscillation of quartz crystal sensor;
Described frequency synthesis unit comprises frequency discriminator, the first low pass filter, voltage controlled oscillator, frequency mixer, the second low pass filter and frequency divider, described frequency discriminator input connects micro-control unit, output is external quartz crystal after the first low pass filter and voltage controlled oscillator successively, and described voltage controlled oscillator output feeds back to frequency discriminator through frequency mixer, the second low pass filter and frequency divider successively.
2. quartz crystal sensor frequency conversion drive circuit according to claim 1, is characterized in that described micro-control unit adopts 89S52 series monolithic.
3. quartz crystal sensor frequency conversion drive circuit according to claim 1, is characterized in that described input block adopts keyboard.
4. quartz crystal sensor frequency conversion drive circuit according to claim 1, is characterized in that described display unit adopts LCM141 liquid crystal display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521116454.1U CN205246094U (en) | 2015-12-30 | 2015-12-30 | Quartz crystal sensor frequency conversion drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521116454.1U CN205246094U (en) | 2015-12-30 | 2015-12-30 | Quartz crystal sensor frequency conversion drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205246094U true CN205246094U (en) | 2016-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521116454.1U Expired - Fee Related CN205246094U (en) | 2015-12-30 | 2015-12-30 | Quartz crystal sensor frequency conversion drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205246094U (en) |
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2015
- 2015-12-30 CN CN201521116454.1U patent/CN205246094U/en not_active Expired - Fee Related
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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: 20160518 Termination date: 20181230 |
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| CF01 | Termination of patent right due to non-payment of annual fee |