CN106124797B - Oscillator drift compensation device and method and rotating speed sensor - Google Patents
Oscillator drift compensation device and method and rotating speed sensor Download PDFInfo
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- CN106124797B CN106124797B CN201610418468.1A CN201610418468A CN106124797B CN 106124797 B CN106124797 B CN 106124797B CN 201610418468 A CN201610418468 A CN 201610418468A CN 106124797 B CN106124797 B CN 106124797B
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- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/49—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents
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Abstract
The invention discloses a drift compensation device and method of an oscillator and a rotating speed sensor. The drift compensation device of the oscillator comprises a temperature measuring unit, at least one potentiometer and a control unit. The temperature measuring unit is suitable for measuring the environment temperature of the oscillator. Each potentiometer is connected in an oscillator. The control unit is adapted to determine a target resistance value for each potentiometer based on the ambient temperature and instruct each potentiometer to adjust to its corresponding target resistance value to compensate for temperature drift of the oscillator.
Description
Technical Field
The invention relates to the field of mechanical equipment, in particular to a drift compensation device and method of an oscillator and a rotating speed sensor.
Background
The rotating speed sensor is suitable for being applied to the fields of wind power, chemical engineering, metallurgy and the like. An eddy current rotational speed sensor is a sensor that measures rotational speed based on the principle of eddy current effect. The eddy current speed sensor generates a high-frequency alternating current signal through an oscillating circuit, and the high-frequency alternating current signal is input into a coil to generate an alternating magnetic field. Figure 1 shows a schematic diagram of the eddy current effect. As shown, when a metal conductor is in close proximity to the coil, the alternating magnetic field H1 will generate an eddy current field at the surface of the conductor. The eddy current field also produces an alternating magnetic field H2 in the opposite direction to H1. Due to the reaction of H2, the amplitude and phase of the high frequency current in the coil is changed, i.e. the effective impedance of the coil is changed. The impedance change of the coil is related to parameters like the permeability u, the conductivity σ, the geometry r, the coil current I1 and the frequency f of the metal conductor and the distance x of the coil to the metal conductor. The functional expression of the equivalent impedance Z of the coil is: z ═ F (u, σ, r, I1, F, x). If u, σ, r, I1, f in the expression Z is constant, the impedance Z of the coil is a single-valued function of the spacing x. For example, if a metal conductor is fixed on the surface of a rotating object, the sensor will output a pulse signal related to the rotation frequency of the object to be measured.
However, the characteristics of the semiconductor device of the oscillation circuit are greatly affected by temperature, which causes the operating point of the oscillation circuit to drift, and in turn, affects the performance index of the rotation speed sensor.
The present invention therefore proposes a new drift compensation scheme.
Disclosure of Invention
To this end, the present invention provides a new drift compensation scheme that effectively addresses at least one of the above problems.
According to one aspect of the present invention, a drift compensation apparatus for an oscillator is provided. The device comprises a temperature measuring unit, at least one potentiometer and a control unit. The temperature measuring unit is suitable for measuring the environment temperature of the oscillator. Each potentiometer is connected in an oscillator. The control unit is adapted to determine a target resistance value for each potentiometer based on the ambient temperature and instruct each potentiometer to adjust to its corresponding target resistance value to compensate for temperature drift of the oscillator.
Optionally, in the drift compensation device according to the present invention, the temperature measuring unit includes a temperature measuring element, an amplifier connected to the temperature measuring element, and an analog-to-digital converter connected to the amplifier. The temperature measuring element is adapted to collect an electrical signal corresponding to the temperature of the oscillator. The amplifier is adapted to amplify the electrical signal collected by the temperature sensing element. The analog-to-digital converter is adapted to convert the amplified electrical signal into a digital signal corresponding to the ambient temperature.
Optionally, in the drift compensation device according to the present invention, the control unit further includes a storage module storing information corresponding to the compensation resistance value and the temperature of each potentiometer. The control unit is adapted to perform the operation of determining the target resistance value of each potentiometer depending on the ambient temperature according to the following manner: and calculating a compensation resistance value corresponding to the environment temperature according to the corresponding information of each potentiometer, and taking the calculated compensation resistance value as a target resistance value of the potentiometer.
Alternatively, in the drift compensation device according to the invention, the control unit is adapted to determine the corresponding information for each potentiometer according to: and acquiring a plurality of data points corresponding to the potentiometer, wherein each data point comprises a temperature value and a compensation resistance value corresponding to the potentiometer at the temperature value. And grouping the data points, and performing straight line fitting operation on each group of data points to obtain the linear relation between the temperature value and the compensation resistance value in the temperature range of each group of data points.
Optionally, in the drift compensation device according to the invention, each set of data points comprises 2 data points. The control unit performs a line fitting operation on each set of data points according to the following manner:
k＝(r1-r2)/(t1-t2)
c＝((r1+r2)-k(t1+t2))/2
r＝kt+c
wherein, t1And r1Is the temperature value and compensation resistance value, t, of one data point in the set of data points2And r2Is the temperature value and compensation resistance value of another data point, t is the temperature value and r is the resistance value.
According to a further aspect of the invention, a tachometer sensor is provided comprising an oscillator and a drift compensation arrangement for the oscillator according to the invention.
Optionally, the revolution speed sensor according to the present invention further comprises a detection amplifying unit and a comparator. The detection amplifying unit is suitable for acquiring and amplifying the electric signal corresponding to the oscillation state of the oscillator. The comparator connected with the detection amplifying unit is suitable for converting the amplified electric signal corresponding to the oscillation state into a corresponding pulse signal.
Alternatively, in the revolution speed sensor according to the present invention, the oscillator includes: triode Q1And a collector thereof is connected to a power supply Vcc. A first resistor RbConnected between a power supply Vcc and a triode Q1Between the base electrodes. A second resistor ReA first terminal and a triode Q1Is connected to the emitter. First coil L1And a second coil L2First coil L1First terminal and second resistor ReSecond terminal, second coil L2Is connected to the first end of the first housing. First capacitorCbIs connected to a triode Q1Base and first coil L1Between the second ends. Second capacitor CoIs connected to the first coil L1Second terminal and second coil L2Between the second ends. Wherein the second coil L2And the second end of (1) is the output end Out. At least one potentiometer and a second resistor R of the drift compensation deviceeAnd (4) connecting in parallel. And the input end of the detection amplifying unit is connected with the output end Out of the oscillator, and the detection amplifying unit is suitable for acquiring and amplifying an electric signal corresponding to the current according to the current of the output end Out.
According to yet another aspect of the invention, an oscillator drift compensation method is provided. The method comprises the following steps. The ambient temperature of the oscillator is measured. And acquiring corresponding information of the compensation resistance value and the temperature of the potentiometer. And calculating the target resistance value of the potentiometer at the ambient temperature according to the ambient temperature and the corresponding information of the potentiometer. The potentiometer is adjusted to a target resistance value.
According to the oscillator drift compensation scheme, a mathematical model of the compensation resistance value and the temperature of the digital potentiometer can be established according to data points containing the corresponding relation between the temperature and the compensation resistance value. Thus, the compensation scheme of the present invention can determine a target resistance value for a potentiometer disposed in an oscillator by measuring the ambient temperature and based on a mathematical model. Furthermore, the compensation scheme of the present invention can adjust the potentiometer in the oscillator to a target resistance value to accurately compensate for the temperature drift of the oscillator. In addition, the eddy current rotating speed sensor applying the compensation scheme of the invention can stably and accurately measure the rotating speed.
Drawings
To the accomplishment of the foregoing and related ends, certain illustrative aspects are described herein in connection with the following description and the annexed drawings, which are indicative of various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to be within the scope of the claimed subject matter. The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description read in conjunction with the accompanying drawings. Throughout this disclosure, like reference numerals generally refer to like parts or elements.
FIG. 1 shows a schematic diagram of the eddy current effect;
FIG. 2 illustrates a schematic diagram of a tachometer sensor 200 according to some embodiments of the present invention;
FIG. 3 illustrates a schematic diagram of a tachometer sensor 300 according to some embodiments of the present invention;
FIG. 4 shows a schematic diagram of a temperature sensing unit 400 according to one embodiment of the invention;
FIG. 5 is a graph showing temperature versus compensation resistance for a potentiometer in an oscillator according to the present invention;
FIG. 6 shows a schematic diagram of an oscillator 600 according to one embodiment of the invention; and
fig. 7 illustrates a flow diagram of an oscillator drift compensation method 700 according to some embodiments of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
FIG. 2 illustrates a schematic diagram of a tachometer sensor 200 according to some embodiments of the present invention. As shown in fig. 2, the rotation speed sensor 200 includes an oscillator 210, and a drift compensation device 230. The oscillator 210 has a coil 211 that generates an alternating magnetic field. When the metal conductor is close to the coil 211, an induced current (eddy current) is generated on the surface of the conductor. As the metal conductor gradually approaches the coil 211, the induced current gradually increases and causes the load in the oscillator 210 to gradually increase. Accordingly, the oscillation of the oscillator 210 gradually weakens until stopped. On this basis, the rotation speed sensor 200 of the present invention can determine the distance from the metal conductor by detecting the oscillation state of the oscillator 210. In other words, the rotation speed sensor 200 can generate a pulse signal representing the rotation speed of the rotating shaft through the distance change of the metal conductor on the rotating shaft. Oscillator 210 may employ any of a variety of known oscillator circuits, as the present invention is not limited in this respect.
The drift compensation device 230 includes a potentiometer 231, a temperature measuring unit 232, and a control unit 233. The potentiometer 231 is connected in the circuit of the oscillator. In other words, the potentiometer 231 is part of the oscillator 210 circuit. The drift compensation means 230 may comprise a plurality of potentiometers arranged in the oscillator 210. Each potentiometer may adjust the resistance as instructed by the control unit 233 to compensate for temperature drift of the oscillator. The following is an exemplary explanation of the resistance value adjustment process of the potentiometer 231.
The temperature measuring unit 232 is adapted to measure the ambient temperature of the oscillator 210. The control unit 233 may determine a target resistance value of the potentiometer 231 according to the ambient temperature. According to an embodiment of the present invention, the temperature measuring unit 232 and the control unit 233 may be integrated in a single chip microcomputer.
FIG. 3 illustrates a schematic diagram of a tachometer sensor 300 according to some embodiments of the present invention. As shown in fig. 3, the rotation speed sensor 300 includes an oscillator 310, a drift compensation device 330, a detection amplification unit 350, and a comparator 370. The specific operation of the oscillator 310 and the drift compensation device 330 is the same as that of the oscillator 210 and the drift compensation device 230, and is not described herein again. In addition, the detection amplifying unit 350 is adapted to acquire and amplify an electric signal corresponding to the oscillation state of the oscillator 310. Here, the oscillation state of the oscillator 310 may be a physical quantity such as an amplitude of oscillation, a current or voltage value in the oscillation circuit, or the like, but is not limited thereto. Depending on the specific circuit of the oscillator 310, the detection amplifying unit 350 may be connected to the oscillator 310 in a corresponding manner to obtain the electric signal corresponding to the oscillation state. The comparator 370 (also referred to as a switching circuit) connected to the detection amplifying unit 350 is adapted to convert the amplified electric signal corresponding to the oscillation state into a corresponding pulse signal. In one embodiment, the comparator 370 determines whether the amplified electric signal corresponding to the oscillation state is less than a threshold value, and outputs a corresponding pulse signal when the amplified electric signal is less than the threshold value, but is not limited thereto.
Alternatively, the temperature measuring unit in fig. 2 and 3 may also be a separate temperature measuring device. FIG. 4 shows a schematic diagram of a thermometric unit 400 according to one embodiment of the present invention. The temperature sensing unit 400 includes a temperature sensing element 410, an amplifier 420, and an analog-to-digital converter 430. The temperature sensing element 410 is adapted to collect an electrical signal corresponding to the ambient temperature around the oscillator. Here, the temperature measuring element 410 is, for example, a thermocouple, a thermistor, or the like. An amplifier 420 coupled to the temperature sensing element 410 is adapted to amplify the electrical signal collected by the temperature sensing element 410. The analog-to-digital converter 430 converts the amplified electrical signal into a digital signal that can be processed by the control unit. In other words, the control unit may determine the ambient temperature from the digital signal.
The control unit can determine the target resistance value of the potentiometer according to the current environmental temperature value. According to one embodiment of the invention, the control unit further comprises a memory module (not shown). The storage module stores corresponding information of the compensation resistance value and the temperature of each potentiometer. The control unit may calculate a compensation resistance value corresponding to the ambient temperature according to the corresponding information of each potentiometer, and use the calculated compensation resistance value as a target resistance value of the potentiometer. In this way, the control unit can instruct the potentiometer to adjust to the target resistance value in order to compensate for the temperature drift of the oscillator. The process of the control unit determining the target resistance value of the potentiometer is described in more detail below with reference to fig. 5.
Fig. 5 shows a graph of temperature versus compensation resistance for a potentiometer in an oscillator. The graph of fig. 5 includes a plurality of data points. The graph of fig. 5 is formed by plotting a plurality of data points. Each data point may be represented as (t, r). t is a temperature value, and r is a compensation resistance value corresponding to t. Here, each data point is a resistance value r obtained by actually measuring the digital potentiometer while compensating for the drift of the operating point of the oscillator at the temperature value t.
In order to facilitate the adjustment of the potentiometer, the present invention is adapted to establish a mathematical model of the temperature and the compensation resistance value based on the plurality of data points. The mathematical model building process according to an embodiment of the present invention is described below, but is not limited thereto.
First, a plurality of data points in a curve are grouped. For example, each set includes two adjacent points in the graph. It should be noted that one data point may be divided into different data groups. Then, a straight line fitting operation is performed based on the data points in each group. Thus, the mathematical model created is a line graph consisting of straight line segments. For example, the temperature of a set of data points is at [ t ]1，t2]In between, the set includes data points (t)1,r1) And (t)2,r2)。[t1，t2]The straight line segments within the range are determined in the following manner.
k＝(r1-r2)/(t1-t2)
c＝((r1+r2)-k(t1+t2))/2
r＝kt+c
Wherein, t1And r1Is the temperature value and compensation resistance value, t, of one data point in the set of data points2And r2Is the temperature value and compensation resistance value of another data point, t is the temperature value and r is the resistance value.
Fig. 6 shows a schematic diagram of an oscillator 600 according to an embodiment of the invention.
The oscillator 600 is adapted to be installed in the rotation speed sensor according to the present invention. As shown in fig. 6, the oscillator 600 includes a transistor Q1And a collector thereof is connected to a power supply Vcc. A first resistor RbConnected between a power supply Vcc and a triode Q1Between the base electrodes. A second resistor ReA first terminal and a triode Q1Is connected to the emitter. First coil L1And a second coil L2First coil L1First terminal and second resistor ReSecond terminal, second coil L2Is connected to the first end of the first housing. A first capacitor CbIs connected to a triode Q1Base and first coil L1Between the second ends. Second capacitor CoIs connected to the first coil L1Second terminal and second coil L2Between the second ends. Wherein the second coil L2And the second end of (1) is the output end Out. Potentiometer R of drift compensation devicetAnd a second resistor ReIn parallel. The input end of the detection amplifying unit is connected with the output end Out of the oscillator 600, and is adapted to obtain and amplify an electrical signal corresponding to the oscillation state of the oscillator 600 according to the current of the output end Out. For example, the detection amplifying unit includes a sampling resistor and an amplifier. The detection amplifying unit is suitable for converting a current signal flowing through the sampling resistor at the output end Out into a voltage signal, and then amplifying the voltage signal through the amplifier. But not limited thereto, the sense amplifying unit may also sense the current signal at the output terminal Out in various known manners, and these manners should fall within the scope of the present invention.
Other components of the rotational speed sensor may take a variety of known configurations and will not be described in detail herein. The control unit according to the invention can regulate R via an interface such as I2C or SPItThe resistance value of (c). It should be noted that fig. 6 is only a schematic diagram of the principle of one oscillator. The revolution speed sensor according to the present invention may also employ various known oscillation circuits. For simplicity of description, a digital potentiometer R is shown in FIG. 6tThe connection in the oscillator. But not limited thereto, those skilled in the art can configure a plurality of digital potentiometers into the oscillator according to the compensation requirements of the oscillator. The invention does not limit the connection mode of each digital potentiometer too much.
Fig. 7 illustrates a flow diagram of an oscillator drift compensation method 700 according to some embodiments of the invention.
As shown in fig. 7, the method 700 begins with step S710, measuring the ambient temperature of the oscillator. The method 700 further includes step S720. In step S720, information corresponding to the compensation resistance value and the temperature of the potentiometer is acquired. The step S720 acquires the corresponding information as follows according to an embodiment of the present invention. First, a plurality of data points corresponding to the potentiometer are acquired. Each data point includes a temperature value and a corresponding compensation resistance value for the potentiometer at the temperature value. Then, a plurality of data points are grouped and a straight line fitting operation is performed on each group of data points. Thus, step S720 may obtain a linear relationship between the temperature and the compensation resistance value within the temperature range where each set of data points is located. The straight line fitting operation for a set of data points is as follows.
k＝(r1-r2)/(t1-t2)，
c＝((r1+r2)-k(t1+t2))/2，
r＝kt+c，
Wherein, t1And r1Is the temperature value and compensation resistance value, t, of one data point in the set of data points2And r2Is the temperature value and compensation resistance value of another data point, t is the temperature value and r is the resistance value.
The method 700 performs step S730 according to the ambient temperature obtained in step S710 and the corresponding information obtained in step S720. In step S730, a target resistance value of the potentiometer at the ambient temperature is calculated. Subsequently, the method 700 proceeds to step S740, where the potentiometer is adjusted to a target resistance value.
A11, the method of a10, wherein the step of obtaining corresponding information of the compensation resistance value and the temperature comprises: acquiring a plurality of data points corresponding to the potentiometer, wherein each data point comprises a temperature value and a compensation resistance value corresponding to the potentiometer at the temperature value; and grouping the data points, and performing straight line fitting operation on each group of data points to obtain the linear relation between the temperature and the compensation resistance value in the temperature range of each group of data points. A12, the method as in a11, wherein each set of data points includes 2 data points, and the operation of fitting a straight line to each set of data points includes:
k＝(r1-r2)/(t1-t2)，
c＝((r1+r2)-k(t1+t2))/2，
r＝kt+c，
wherein, t1And r1Is the temperature value and compensation resistance value, t, of one data point in the set of data points2And r2Is the temperature value and the compensation resistance value of another data point, t is the temperature value and r is the compensation resistance value.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into multiple sub-modules.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Furthermore, some of the described embodiments are described herein as a method or combination of method elements that can be performed by a processor of a computer system or by other means of performing the described functions. A processor having the necessary instructions for carrying out the method or method elements thus forms a means for carrying out the method or method elements. Further, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is used to implement the functions performed by the elements for the purpose of carrying out the invention.
As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.
Claims (11)
1. A drift compensation apparatus for an oscillator, comprising:
the temperature measuring unit is suitable for measuring the ambient temperature of the oscillator, and the oscillator is an LC oscillator;
at least one potentiometer, each connected in the oscillator, and connected in parallel with a resistance of the oscillator; and
the control unit is suitable for determining a target resistance value of each potentiometer according to the ambient temperature and instructing each potentiometer to adjust to the corresponding target resistance value so as to compensate the temperature drift of the oscillator; and
a storage module storing correspondence information of the compensation resistance value and the temperature of each potentiometer, the correspondence information being a mathematical model relating to the temperature and the compensation resistance value established from a plurality of data points containing a correspondence of the temperature and the compensation resistance value, the control unit being adapted to perform an operation of determining a target resistance value of each potentiometer from an ambient temperature according to:
and calculating a compensation resistance value corresponding to the environment temperature according to the corresponding information of each potentiometer, and taking the calculated compensation resistance value as a target resistance value of the potentiometer.
2. The apparatus of claim 1, wherein the thermometric unit comprises:
the temperature measuring element is suitable for acquiring an electric signal corresponding to the environment temperature of the oscillator;
the amplifier is connected with the temperature measuring element and is suitable for amplifying the electric signal collected by the temperature measuring element; and
an analog-to-digital converter connected to the amplifier and adapted to convert the amplified electrical signal to a digital signal corresponding to the ambient temperature.
3. The apparatus of claim 1, wherein the control unit is adapted to determine the corresponding information for each potentiometer according to:
acquiring a plurality of data points corresponding to the potentiometer, wherein each data point comprises a temperature value and a compensation resistance value corresponding to the potentiometer at the temperature value; and
and grouping the data points, and performing straight line fitting operation on each group of data points to obtain the linear relation between the temperature value and the compensation resistance value in the temperature range of each group of data points.
4. The apparatus of claim 3, wherein each set of data points comprises 2 data points, and the control unit performs a line fitting operation on each set of data points according to:
k＝(r1-r2)/(t1-t2)
c＝((r1+r2)-k(t1+t2))/2
r＝kt+c
wherein, t1And r1Is the temperature value and compensation resistance value, t, of one data point in the set of data points2And r2Is the temperature value and the compensation resistance value of another data point, t is the temperature value and r is the compensation resistance value.
5. A rotational speed sensor comprising:
an oscillator, which is an LC oscillator; and
a drift compensation device for an oscillator according to any one of claims 1 to 4.
6. A speed sensor according to claim 5, further comprising:
the detection amplifying unit is suitable for acquiring and amplifying the electric signal corresponding to the oscillation state of the oscillator; and
and the comparator is connected with the detection amplifying unit and is suitable for converting the amplified electric signals corresponding to the oscillation states into corresponding pulse signals.
7. A rotation speed sensor according to claim 5 or 6, wherein the oscillator comprises:
triode Q1The collector of which is connected to a power supply Vcc,
a first resistor RbConnected between a power supply Vcc and a triode Q1Between the base electrode of the first electrode and the second electrode,
a second resistor ReA first terminal and a triode Q1Is connected with the emitter of the light emitting diode,
first coil L1And a second coil L2First coil L1First terminal and second resistor ReSecond terminal, second coil L2Is connected with the first end of the first connecting pipe,
a first capacitor CbIs connected to a triode Q1Base and first coil L1Between the first end and the second end of the first,
second capacitor CoIs connected to the first coil L1Second terminal and second coil L2Between the second ends of the first and second coils L, wherein the second coil L2The second end of (1) is an output end Out;
at least one potentiometer and a second resistor R of the drift compensation deviceeAnd (4) connecting in parallel.
8. A rotation speed sensor according to claim 7,
and the input end of the detection amplifying unit is connected with the output end Out, and the detection amplifying unit is suitable for acquiring and amplifying an electric signal corresponding to the current according to the current of the output end Out.
9. An oscillator drift compensation method, comprising:
measuring the ambient temperature of an oscillator, wherein the oscillator is an LC oscillator;
acquiring corresponding information of a compensation resistance value and temperature of a potentiometer, wherein the potentiometer is connected with a resistor of the oscillator in parallel, and the corresponding information is a mathematical model which is established according to a plurality of data points containing the corresponding relation between the temperature and the compensation resistance value and relates to the temperature and the compensation resistance value;
calculating a target resistance value of the potentiometer at the ambient temperature according to the ambient temperature and corresponding information of the potentiometer; and
the potentiometer is adjusted to a target resistance value.
10. The method of claim 9, wherein the step of obtaining corresponding information of the compensation resistance value and the temperature comprises:
acquiring a plurality of data points corresponding to the potentiometer, wherein each data point comprises a temperature value and a compensation resistance value corresponding to the potentiometer at the temperature value; and
and grouping the data points, and performing straight line fitting operation on each group of data points to obtain the linear relation between the temperature and the compensation resistance value in the temperature range of each group of data points.
11. The method of claim 10, wherein each set of data points includes 2 data points, and wherein fitting a straight line to each set of data points includes:
k＝(r1-r2)/(t1-t2)，
c＝((r1+r2)-k(t1+t2))/2，
r＝kt+c，
wherein, t1And r1Is the temperature value and compensation resistance value, t, of one data point in the set of data points2And r2Is the temperature value and the compensation resistance value of another data point, t is the temperature value and r is the compensation resistance value.
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|---|---|---|---|---|
| CN2794038Y (en) * | 2005-06-03 | 2006-07-05 | Bcd半导体制造有限公司 | Temperature coefficient compensating circuit for oscillator and oscillator therewith |
| CN101305514A (en) * | 2005-11-07 | 2008-11-12 | 西铁城控股株式会社 | Temperature compensation oscillator and method for manufacturing the same |
| CN103259533A (en) * | 2012-02-15 | 2013-08-21 | 上海期成微电子技术有限公司 | Phase-locked loop circuit of LC oscillator and temperature compensating method thereof |
| CN103363886A (en) * | 2013-07-17 | 2013-10-23 | 国家电网公司 | Method and system for full-measuring-range temperature compensation of swing sensor of generating set |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2833432A1 (en) * | 2001-12-11 | 2003-06-13 | Koninkl Philips Electronics Nv | TEMPERATURE COMPENSATION DEVICE AND ELECTRONIC APPARATUS COMPRISING SUCH A DEVICE |
| CN2553356Y (en) * | 2002-07-15 | 2003-05-28 | 深圳市时频科技有限公司 | High precision temp. compensating crystal oscillator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2794038Y (en) * | 2005-06-03 | 2006-07-05 | Bcd半导体制造有限公司 | Temperature coefficient compensating circuit for oscillator and oscillator therewith |
| CN101305514A (en) * | 2005-11-07 | 2008-11-12 | 西铁城控股株式会社 | Temperature compensation oscillator and method for manufacturing the same |
| CN103259533A (en) * | 2012-02-15 | 2013-08-21 | 上海期成微电子技术有限公司 | Phase-locked loop circuit of LC oscillator and temperature compensating method thereof |
| CN103363886A (en) * | 2013-07-17 | 2013-10-23 | 国家电网公司 | Method and system for full-measuring-range temperature compensation of swing sensor of generating set |
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