CN103175984B - Wide-range high-accuracy tachometric survey circuit - Google Patents
Wide-range high-accuracy tachometric survey circuit Download PDFInfo
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- CN103175984B CN103175984B CN201310086952.5A CN201310086952A CN103175984B CN 103175984 B CN103175984 B CN 103175984B CN 201310086952 A CN201310086952 A CN 201310086952A CN 103175984 B CN103175984 B CN 103175984B
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Abstract
The invention provides a kind of wide-range high-accuracy tachometric survey circuit.Use the digital circuit of wideband magnetic induction speed transducer, high-speed comparator, resistor, capacitor, microprocessor composition.Use signal filtering, compare shaping and the rotating speed utilizing system under test (SUT) to export, change the fiducial value of microprocessor output comparator so that the measuring precision improves, and solve system under test (SUT) can not measure problem the most continuously.Circuit of the present invention has that circuit composition is simple, economical and practical, be easily integrated, certainty of measurement is high, test the speed the advantages such as wide ranges.The present invention is applicable to control rotating mechanism, needs the most accurately to measure the occasion of rotating speed during control.
Description
Technical field
The present invention relates to a kind of tachometer circuit, the wide-range high-accuracy tachometric survey circuit of a kind of rotating mechanism for measuring high-speed cruising.
Background technology
In small sized turbine jet engine running, running speed is per minute to be forwarded to more than hundreds of thousands turns, need wide scope, high-precision measurement rotational speed devices to measure its rotating speed from tens.Major part uses magnetoelectric induction sensor to measure its rotating speed as measuring device at present.Although magnetoelectric induction sensor has the advantage such as noncontact, strong interference immunity；But because when its sensing rotating speed is the highest, signal output voltage is the highest, corresponding noise voltage is the highest；When rotating speed is relatively low, signal output voltage is low.The speed error that common tachometer circuit easily causes measurement when measuring rotating speed is relatively big, and the certainty of measurement error of the widest generation of measured scope is the biggest, causes that measurement scope is narrower, precision is relatively low.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that the tachometric survey circuit of a kind of wide-range high-accuracy, solve the problem that measurement error is relatively big and the scope that tests the speed is narrower that existing tachometer circuit exists.
The technical scheme provided according to the present invention, described wide-range high-accuracy tachometric survey circuit includes: the signal output part of speed probe connects one end of the second resistor, one end of the second electric capacity, one end of the 3rd electric capacity respectively, the 3rd electric capacity other end connects inverting input and one end of the 7th resistor of comparator respectively, the other end of the 7th resistor connects outfan and the external interrupt mouth of microprocessor of comparator, and the positive input of comparator connects one end of the 5th resistor, one end of the 3rd resistor and one end of the first resistor respectively；The 5th resistor other end is connected with the digital-to-analogue conversion outfan of microprocessor；The power end of one end of the first resistor, one end of the first capacitor and sensor connects, the first resistor other end, the second resistor other end, the 3rd resistor other end are all connected with power supply, and the first capacitor other end, the 4th resistor other end, the second capacitor other end are connected with power supply ground.
Described microprocessor uses embedded microprocessor.Described speed probe is magnetic induction speed transducer.
The invention have the advantage that
1 circuit structure of the present invention is simple, economical, be easily integrated.
2 circuit measuring precision of the present invention height, the wide ranges that tests the speed, strong interference immunity.
3 circuit fiducial values of the present invention can regulate according to practical situation, is suitable for various tach sensor circuit.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The novel wide-range high-accuracy tachometric survey circuit that this circuit is made up of wideband magnetic induction speed transducer, high-speed comparator, resistor, capacitor, embedded microprocessor.
As shown in Figure 1, the signal output part of speed probe connects one end of the second resistor R2, one end of the second electric capacity C2, one end of the 3rd electric capacity C3 respectively, for the pull-up effect of wideband magnetic induction speed probe and signal is filtered, strengthen tach signal capacity of resisting disturbance；3rd electric capacity C3 is used for filtering of the noise signal of tach signal；The 3rd electric capacity C3 other end connects inverting input (input of tach signal) and one end of the 7th resistor R7 of comparator IC1 respectively, the other end of the 7th resistor R7 connects outfan and the external interrupt mouth INT of microprocessor IC2 of comparator IC1, triggers the interruption of microprocessor for tach signal；The positive input of comparator IC1 connects one end of the 5th resistor R5, one end of the 3rd resistor R3 and one end of the first resistor R4 respectively；The 5th resistor R5 other end is connected with the digital-to-analogue conversion outfan D/A of microprocessor IC2；For the microprocessor regulation to comparator IC1 forward end signal；The power end of one end of the first resistor R1, one end of the first capacitor C1 and sensor connects, the first resistor R1 other end, the second resistor R2 other end, the 3rd resistor R3 other end are all connected with power supply, and the first capacitor C1 other end, the 4th resistor R4 other end, the second capacitor C2 other end are connected with power supply ground.
The tach signal of speed probe output, because the function having pullup resistor R2 makes signal anti-interference strengthen, filtered electric capacity is filtered, the comparing voltage value of D/A mouth output is regulated further according to the rate signal size resolved by microprocessor, thus regulate the height of high-speed comparator limit signal end to limit the spacing value of high-speed comparator IC1 (when the rotating speed in system under test (SUT) is less than when arranging critical speed, export relatively low fiducial value, when the rotating speed in system under test (SUT) is higher than when arranging critical speed, output HIGH voltage fiducial value), trigger output end output low and high level signal is carried out through high-speed comparator IC1, embedded microprocessor response external interrupt trigger signal measures rotating speed, thus reach high accuracy, wide scope measures rotating speed.
As can be seen here, the present invention uses output signal to carry out pull-up and filtering data processes, and solves, easily by external interference, to improve certainty of measurement problem.Meanwhile, using the critical speed of system under test (SUT) output, change the fiducial value of microprocessor output comparator, solve system under test (SUT) can not measure problem the most continuously.
In sum, the wide scope of the present invention, in high precision tachometric survey circuit solve the problem that measurement error is relatively big and the scope that tests the speed is narrower that in prior art, tachometer circuit exists；And can be widely applied in various measurement rotating speed module.
Claims (1)
1. wide-range high-accuracy tachometric survey circuit, including speed probe, it is characterized in that: the signal output part of described speed probe connects one end of the second resistor (R2) respectively, one end of second electric capacity (C2), one end of 3rd electric capacity (C3), 3rd electric capacity (C3) other end connects inverting input and one end of the 7th resistor (R7) of comparator (IC1) respectively, the other end of the 7th resistor (R7) connects outfan and the external interrupt mouth of microprocessor (IC2) of comparator (IC1), the positive input of comparator (IC1) connects one end of the 5th resistor (R5) respectively, one end of 3rd resistor (R3) and one end of the 4th resistor (R4)；5th resistor (R5) other end is connected with the digital-to-analogue conversion outfan of microprocessor (IC2)；The power supply of one end of the first resistor (R1), one end of the first capacitor (C1) and sensor connects, first resistor (R1) other end, the second resistor (R2) other end, the 3rd resistor (R3) other end are all connected with power supply, and the first capacitor (C1) other end, the 4th resistor (R4) other end, the second capacitor (C2) other end are connected with power supply ground；
Described microprocessor (IC2) uses embedded microprocessor；Described speed probe is magnetic induction speed transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310086952.5A CN103175984B (en) | 2013-03-18 | 2013-03-18 | Wide-range high-accuracy tachometric survey circuit |
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| CN201310086952.5A CN103175984B (en) | 2013-03-18 | 2013-03-18 | Wide-range high-accuracy tachometric survey circuit |
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| CN103175984A CN103175984A (en) | 2013-06-26 |
| CN103175984B true CN103175984B (en) | 2016-08-10 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101097129A (en) * | 2007-07-13 | 2008-01-02 | 重庆大学 | CCD data acquisition and processing equipment used for high-speed displacement measuring |
| CN101997523A (en) * | 2010-10-15 | 2011-03-30 | 北京联合大学生物化学工程学院 | Window voltage comparator circuit capable of adjusting up limit voltage and low limit voltage automatically |
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2013
- 2013-03-18 CN CN201310086952.5A patent/CN103175984B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101097129A (en) * | 2007-07-13 | 2008-01-02 | 重庆大学 | CCD data acquisition and processing equipment used for high-speed displacement measuring |
| CN101997523A (en) * | 2010-10-15 | 2011-03-30 | 北京联合大学生物化学工程学院 | Window voltage comparator circuit capable of adjusting up limit voltage and low limit voltage automatically |
Non-Patent Citations (2)
| Title |
|---|
| 一种基于线性霍尔传感器的直流电机转速测量方法;田汉波等;《机械与电子》;20071231(第1期);31-33 * |
| 电压比较器可变阈值的实现;范晓俊;《电子技术》;19971231(第9期);35-36 * |
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