CN110108234B - Current type bidirectional bending sensor driving device and automatic return-to-zero initialization method - Google Patents
Current type bidirectional bending sensor driving device and automatic return-to-zero initialization method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The invention discloses a current type bidirectional bending sensor driving device and an automatic zeroing initialization method, which relate to a sensor driving device, and solve the problem of inconvenient use. The technical scheme is characterized by comprising a central controller circuit, a driving voltage shaping circuit, a V-I conversion and filtering circuit and an I-V conversion and filtering circuit, wherein the central controller circuit comprises a core control device, a nonvolatile memory device, a voltage regulating device, a voltage acquisition device and a communication unit, and an initialization expected output value Vexpect, an adjustment step length delta U, a voltage regulation default value Udefault, a voltage regulation set value record Urec and an error value epsilon are stored in the nonvolatile memory device. And calculating DeltaV= Vexpect-Vout, and if DeltaV < epsilon, replacing the original voltage regulation set value record Urec with the current driving voltage information Ud, thereby achieving the effect of improving the measurement efficiency and the production efficiency.
Description
Technical Field
The invention relates to a sensor driving device, in particular to a current type bidirectional bending sensor driving device and an automatic return-to-zero initialization method.
Background
The sensor is a detection device, can collect the measured information, and can be converted into an electric signal or other information output in a required form according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. Most of the sensors used in the market are resistive sensors, which are passive elements, equivalent to varistors in circuit abstraction, and the driving device is generally designed as a bridge circuit or a resistive divider circuit. Since there is an individual difference of the sensors, that is, the resistance value of each sensor is different, this means that if a fixed circuit parameter is employed in developing the driving apparatus, the initial value of the measurement output obtained in the state where the sensor is straightened is different. Therefore, when the sensor is connected with the driving device, the driving device is required to be adjusted in circuit parameters, and when the sensor on the driving device is replaced next time, the driving device is required to be adjusted in circuit parameters, so that the sensor is inconvenient to use, and the measurement efficiency and the production efficiency are reduced. Therefore, the prior art has the problem of lower production efficiency and measurement efficiency.
Disclosure of Invention
The invention aims to provide a current type bidirectional bending sensor driving device and an automatic return-to-zero initialization method, which can automatically adjust circuit parameters and achieve the effect of improving measurement efficiency and production efficiency.
The technical aim of the invention is realized by the following technical scheme:
The current type bidirectional bending sensor driving device comprises a central controller circuit, a driving voltage shaping circuit, a V-I conversion and filtering circuit and an I-V conversion and filtering circuit, wherein the central controller circuit comprises a core control device, a nonvolatile memory device, a voltage regulating device, a voltage acquisition device and a communication unit, an initialization expected output value Vexpect, an adjustment step length DeltaU, a voltage regulation default value Udefault, a voltage regulation set value record Urec and an error value epsilon are stored in the nonvolatile memory device, the core control device is electrically connected with the nonvolatile memory device, the voltage regulating device and the voltage acquisition device, the core control device is in communication connection with the communication unit, two ends of the driving voltage shaping circuit are respectively electrically connected with the voltage regulating device and the V-I conversion and filtering circuit, the V-I conversion and filtering circuit is provided with a driving current output end, the I-V conversion and filtering circuit is electrically connected with the voltage acquisition device of the central controller circuit, and the I-V conversion and filtering circuit is provided with a sensor output current receiving end.
The automatic zeroing initialization method of the current type bidirectional bending sensor driving device comprises the following steps:
Output drive voltage information Ud: the core control device checks whether a voltage regulation set point record Urec exists; if the voltage regulation set value record Urec exists, transmitting driving voltage instruction data to a voltage regulation device according to the voltage regulation set value record Urec; if the voltage regulation set value record Urec does not exist, driving voltage instruction data are transmitted to a voltage regulation device according to a voltage regulation default value Udefault;
Output drive current: the voltage regulating device receives voltage instruction data and outputs driving voltage information Ud, the driving voltage shaping circuit receives the driving voltage information Ud, the driving voltage shaping circuit shapes the driving voltage information Ud and then transmits the driving voltage information Ud to the V-I converting and filtering circuit, and the V-I converting and filtering circuit converts the driving voltage information Ud into driving current and transmits the driving current to the current type bidirectional bending sensor;
Converting the sensor output current: the I-V conversion and filtering circuit receives a sensor output current sent by the current type bidirectional bending sensor, converts the sensor output current into an output voltage Vout and transmits the output voltage Vout to the voltage acquisition device;
Error value comparison: the core control device reads an initialization expected output value Vexpect, an error value epsilon and an output voltage Vout, calculates DeltaV= Vexpect-Vout, compares DeltaV with epsilon, and enters a step of updating a voltage regulation set value record Urec if DeltaV < epsilon;
updating the voltage regulation setting value record Urec: the core control device stores the current driving voltage information Ud to a nonvolatile memory device and replaces the original voltage regulation set value record Urec.
Further: in the step of comparing error values, the method further comprises the steps of:
If the delta V is larger than epsilon and the delta V is smaller than 0, the core control device reads the adjustment step length delta U and calculates Ud=Ud-delta U, the calculated driving voltage information Ud is output to the voltage regulating device, and then the step of outputting driving current is entered.
Further: in the step of comparing error values, the method further comprises the steps of:
If the delta V is larger than epsilon and the delta V is larger than 0, the core control device reads the adjustment step length delta U, calculates Ud=Ud+delta U, outputs calculated driving voltage information Ud to the voltage regulating device, and then enters the step of outputting driving current.
Further: before the step of outputting the driving voltage information Ud, the method further comprises the steps of:
The sensor straightens naturally: the current type bidirectional bending sensor is in a natural straightening state.
Further: before the step of outputting the driving voltage information Ud, the method further comprises the steps of:
Initial setting: the expected output value Vexpect, the adjustment step length DeltaU, the voltage regulation set value record Urec and the error value epsilon are initialized through programming preset.
In summary, the invention has the following beneficial effects:
The driving device of the current type bidirectional bending sensor can adjust the output of the current type bidirectional bending sensor to enable the actual output value to be equal to the expected output value by adjusting the driving current according to the preset initialization expected output value Vexpect after the power-on starting. The driving device can realize the function of automatic zero initialization when the current type bidirectional bending sensor is in a natural straightening state, so that the output value of each current type bidirectional bending sensor is consistent in the natural straightening state, and the purpose of eliminating the individual difference of the sensors is directly achieved when the current type bidirectional bending sensor is driven.
After the development of the current type bidirectional bending sensor driving device is completed, circuit parameters are not required to be adjusted in the use process, the current type bidirectional bending sensor with different types can be adapted, and the production efficiency and the measurement efficiency are greatly improved.
The current type bidirectional bending sensor driving device can also provide information for an external measurement application device, so that the external measurement application device can better measure.
The driving device of the current type bidirectional bending sensor is used as an external measurement application device and an intermediate layer of the current type bidirectional bending sensor, and the driving device and the intermediate layer are connected to form an integral closed loop structure. The decoupling method is essentially used for decoupling the current type bidirectional bending sensor from an external measurement application device, and the initial value of the current type bidirectional bending sensor is uniform no matter how the current type bidirectional bending sensor is replaced for the external measurement application device, so that the idea of closed loop-decoupling can be applied to more application scenes.
Since the data is continuously monotonically changing as the measured object is bi-directionally bent, auto-zero initialization is necessary for measuring bi-directional bending (auto-zero initialization refers to initializing the output voltage Vout-of the current bi-directional bending sensor in a natural straightened state-with an expected output value Vexpect < error value epsilon-under a fixed measurement application scenario). The current-type bi-directional bending sensor is thus brought into a natural straightened state prior to testing, which means that the initial value of the current-type bi-directional bending sensor after auto-zero initialization is not the minimum value, but the median value, which is essentially different from the existing driving devices on the market.
Drawings
Fig. 1 is a schematic diagram of a connection structure of a driving device in the present embodiment;
FIG. 2 is a schematic diagram of the operation flow of the current-type bi-directional bending sensor driving device according to the present embodiment;
FIG. 3 is a schematic circuit diagram of the central controller circuit in this embodiment;
FIG. 4 is a schematic diagram showing circuit connections of the driving voltage shaping circuit, the V-I converting and filtering circuit and the I-V converting and filtering circuit in the present embodiment;
FIG. 5 is a sectional view of the light escape groove and the whispering gallery blocking groove in the present embodiment;
FIG. 6 is a schematic view of the light path of the light guiding member in the natural straightened state in the present embodiment;
FIG. 7 is a schematic view of the light path of the light guiding member in the present embodiment when it is bent toward the side close to the whispering gallery blocking groove;
FIG. 8 is a schematic view of the light path of the light guiding member in this embodiment when it is bent toward the side close to the light escape groove.
Reference numerals: 11. a light guide body; 12. a light escape groove; 13. echo wall blocking grooves; 14. a cladding layer; 15. a first connector; 16. a second connector; 21. a light emitting assembly; 22. and a light receiving assembly.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Examples:
The current type bidirectional bending sensor driving device, as shown in fig. 1 to 8, comprises a central controller circuit, a driving voltage shaping circuit, a V-I converting and filtering circuit and an I-V converting and filtering circuit. The central controller circuit comprises a core control device, a nonvolatile memory device, a voltage regulating device, a voltage acquisition device and a communication unit, wherein the communication unit is a USB communication unit in the embodiment, and is connected with an external measurement application device through an external interface and used for receiving information related to driving and measurement. The chip type used by the central controller circuit is STM32F103C8T6, and the ARM core central computing device, the FLASH storage device, the PWM generating device, the ADC analog-to-digital conversion device and the USB communication control device are integrated in the chip and correspond to the core control device, the nonvolatile storage device, the voltage regulating device, the voltage acquisition device and the USB communication unit respectively.
Wherein the voltage regulating device is configured to 42 pins of the STM32F103C8T6 chip, i.e. the voltage regulating information Ud is output through the 42 pins, in this embodiment, the voltage regulating information Ud is PWM information; the voltage acquisition device is configured to 10 pins of the STM32F103C8T6 chip, namely the sensor output voltage Uout is acquired through the 10 pins, and the Uout can be also sent to an external measurement application device through the 10 pins; the USB communication control device is configured to the 31 pins and the 32 pins of the STM32F103C8T6 chip, through which USB communication with an external measurement application device is possible.
The nonvolatile memory device stores an initialization expected output value Vexpect, an adjustment step length DeltaU, a voltage adjustment default value Udefault, a voltage adjustment set value record Urec and an error value epsilon, the conversion method is related to topological parameters of the driving voltage shaping circuit and the V-I conversion and filtering circuit, and the default value Udefault is not lower than the conversion value of the minimum current value of the driving current type bidirectional sensor.
The core control device is electrically connected with the nonvolatile memory device, the voltage regulating device and the voltage acquisition device, the core control device is in communication connection with the communication unit, two ends of the driving voltage shaping circuit are respectively electrically connected with the voltage regulating device and the V-I conversion and filter circuit, the V-I conversion and filter circuit is provided with a driving current output end, and the voltage acquisition device is electrically connected with the I-V conversion and filter circuit.
The driving voltage shaping circuit comprises a resistor R7 and a capacitor C7, wherein the resistor R7 is connected in series with the driving voltage shaping circuit, one end of the capacitor C7 is electrically connected with the driving voltage shaping circuit, and the other end of the capacitor C7 is grounded.
After the voltage regulation information Ud has passed through the RC filter network formed by the resistor R7 and the capacitor C7, the PWM square wave is shaped into a direct voltage Udrive, the magnitude of which direct voltage Udrive is proportional to the duty cycle of the PWM square wave.
The V-I conversion and filter circuit comprises a resistor R8 and a capacitor C8, wherein the resistor R8 is connected in series with the V-I conversion and filter circuit, one end of the capacitor C8 is electrically connected with the V-I conversion and filter circuit, the other end of the capacitor C is grounded, and the driving current output end is connected with the capacitor C8 in parallel.
The capacitor C8 is connected with the light-emitting element at the input end of the sensor in parallel, so that the function of filtering high-frequency clutter can be achieved; the resistor R8 is connected in series with the light-emitting element at the sensor input, so that the dc voltage Udrive is converted into the drive current Id of the sensor by the resistor R8.
The I-V conversion and filter circuit comprises a VCC connecting end, a resistor R9 and a capacitor C9, wherein two ends of the resistor R9 are respectively and electrically connected with the VCC connecting end and the I-V conversion and filter circuit, one end of the capacitor C9 is electrically connected with the I-V conversion and filter circuit, and the other end of the capacitor C9 is grounded.
One end of R9 is pulled up by VCC, and the other end of the resistor R9 is connected with the output end of the sensor in series, so that a power supply can be provided for a phototriode at the output end of the sensor. The photo transistor photo-excited current flows through resistor R9, creating a voltage drop across resistor R9, and thus the sensor output current is converted into sensor output voltage Uout. The capacitor C9 functions to filter out high frequency noise of the sensor output voltage Uout.
The I-V conversion and filtering circuit is electrically connected with an external measurement application device connecting end.
The output voltage of the sensor is transmitted to the external measurement application device through the connection end of the external measurement application device, so that the effect of conveniently receiving the information acquired by the sensor is achieved.
The amperometric bi-directional bend sensor comprises a light emitting assembly 21, a light receiving assembly 22 and a light guiding element having a flexibility, the refractive index of which is greater than 1, in this embodiment an optical fiber. The light emitting component 21 is electrically connected with the driving current output end, and the light receiving component 22 is electrically connected with the sensor output current receiving end. The change of the luminous flux of the light guiding element has monotonicity in the process of bending the light guiding element to a single direction, the light emitting component 21 and the light receiving component 22 are respectively and fixedly arranged at two ends of the light guiding element, the light emitting component 21 comprises a light emitting element, the light receiving component 22 comprises a light receiving element, and the light emitting element and the light receiving element are respectively arranged at two ends of the light guiding element.
The light emitting element is an active light emitting device in which the amount of light emission is proportional to the drive current.
The light emitting element is a light emitting diode.
The light receiving element is an active light flux detection device in which the output current of the sensor is in direct proportion to the light flux received by the surface of the light receiving element under the condition that the power supply voltage is unchanged.
The light receiving element is a phototransistor.
The light guide element comprises a light guide body 11, the light guide body 11 is made of a material with a refractive index larger than 1 and flexible, and the light guide body 11 comprises at least 1 unit length section;
Within a unit length of: the light guide body 11 is provided with a light escape groove 12 and a whispering gallery blocking groove, the light escape groove 12 and the whispering gallery blocking groove all extend along the length direction of the light guide body 11, the depth of the light escape groove 12 is smaller than 1/20 of the width of the light guide body 11, the depth of the whispering gallery blocking groove does not exceed the depth of the light escape groove 12, the inner surface area of the light escape groove 12 is not smaller than 4 times of the inner surface area of the whispering gallery blocking groove, and at least 1 cross section center of the light guide body 11 is positioned on a connecting line of the geometric center of the surface of the light escape groove 12 and the geometric center of the surface of the whispering gallery blocking groove.
The arrows shown in fig. 5, 6 and 7 point in the intended light ray entry direction. Through the arrangement of the light escape groove 12 and the whispering gallery blocking groove 13, the light guide body 11 can influence the geometric model of the light path through the light escape groove 12 or the whispering gallery blocking groove 13 no matter in the direction from the light escape groove 12 to the whispering gallery blocking groove 13 or in the direction from the whispering gallery blocking groove 13 to the light escape groove 12, so that the geometric model of the light path is not matched with the geometric model of the bending loss oscillation phenomenon, and the bending loss oscillation phenomenon in the bending to two directions is eliminated. Therefore, bending the light flux in two different directions of the light guide body 11 causes the light flux to change monotonously because of eliminating the bending loss oscillation phenomenon. The luminous flux also changes monotonically during the bending of the light guide body 11 from the straightened state to the single direction, or during the stretching of the light guide body from the bent state to the straightened state in the single direction.
When the light guide body 11 is in a straightened state, due to the existence of the light escape groove 12 and the whispering gallery blocking groove 13, part of light with a specific incident angle escapes from the cortex through the light escape groove 12 and the whispering gallery blocking groove 13 to be dissipated, so that a part of luminous flux of the light guide body 11 is lost when in the straightened state.
When the light guide body 11 is bent to one side of the light escape groove 12, the inner surface of the light escape groove 12 is gradually compressed and gradually tends to be parallel to the incident light path, at which time the amount of light dissipated from the light escape groove 12 is reduced; while the surface of the whispering gallery blocking groove 13 is stretched and gradually tends to be perpendicular to the incident light path, at which time the amount of light dissipated from the whispering gallery blocking groove 13 increases instead. Since the total surface area of the light escape grooves 12 is larger than the total surface area of the whispering gallery blocking grooves 13, the light flux is monotonously increased as the light guide body 11 is bent to one side of the light escape grooves 12 because the light escape grooves 12 are the main factor causing the change in the light flux.
When the light guide body 11 is bent to one side of the whispering gallery blocking groove 13, the surface of the light escape groove 12 is stretched and gradually tends to be perpendicular to the incident light path, and more light escapes from the cortex of the light escape groove 12 to be dissipated, so that the luminous flux is reduced; at this time, the surface of the whispering gallery blocking groove 13 is compressed and gradually tends to be parallel to the incident light path, so that the light originally escaping from the cortex of the whispering gallery blocking groove 13 is now retained, and the luminous flux is increased. Since the total surface area of the light escape grooves 12 is larger than the total surface area of the whispering gallery blocking grooves 13, the light flux is monotonously reduced as the light guide body 11 is bent to one side of the whispering gallery blocking grooves 13 because the light escape grooves 12 are the main factor causing the change in the light flux.
So that the light flux variation of the light guide body 11 is monotonously varied and continuously varied, regardless of whether the light guide body 11 is bent in the direction of the whispering gallery blocking groove 13 toward the light escape groove 12 or the light escape groove 12 toward the whispering gallery blocking groove 13.
The light source is provided to the light guide member by the light emitting element of the light emitting element 21, and light passes through the light guide member from the light emitting element and irradiates the light receiving element of the light receiving element 22. When the quantity of light emitted by the light emitting element is constant, the light flux of the light guiding element is in one-to-one correspondence with the bending degree by the light guiding element with monotonicity of the change of the light flux of the light guiding element during bending in a single direction. The stable light source is provided by the light emitting element, and the light guiding element is bent along with the bending of the measured object, so that the luminous flux of the light guiding element is changed, the light after the change of the luminous flux is received by the light receiving element, and the light receiving element is used for converting the light into a signal, so that the function of detecting the bending degree of the measured object is realized. And because the change of the luminous flux of the light guide element has monotonicity in the process of bending the light guide element to a single direction, the bending direction and the bending angle of the measured object are also in one-to-one correspondence with the bending degree of the light guide element, and then the bending direction and the bending angle of the measured object can be obtained through the received light conversion signals by the light receiving element, so that the effect of bidirectional bending detection is realized, the detection effect and the application range are effectively improved, the angle measurement is very convenient, and the measurement precision is higher.
In the embodiment, the driving input of the sensor is a current value, and the light-emitting quantity of the light-emitting element is in direct proportion to the driving current; the light receiving element outputs a current value after receiving the light. Under the condition that the power supply voltage is unchanged, the output current of the light receiving component 22 is in a direct proportion to the luminous flux received by the surface, namely the output current of the sensor corresponds to the bending degree one by one, so that the bending direction and the bending angle of the measured object can be judged through the magnitude of the current.
A first connecting piece 15 is arranged between the light emitting component 21 and the light guiding element, the first connecting piece 15 is solid, the first connecting piece 15 is provided with a first opening for accommodating the light emitting component 21, the first connecting piece 15 is provided with a first connecting hole for accommodating one end of the light guiding element and penetrating through the first opening, and the first connecting piece 15 is respectively rigidly bonded with the light emitting component 21 and the light guiding element through transparent adhesives.
A second connecting piece 16 is arranged between the light receiving component 22 and the light guiding element, the second connecting piece 16 is solid, the second connecting piece 16 is provided with a second opening for accommodating the light receiving component 22, the second connecting piece 16 is provided with a second connecting hole for accommodating one end of the light guiding element and penetrating through the second opening, and the second connecting piece 16 is respectively rigidly bonded with the light receiving component 22 and the light guiding element through transparent adhesives.
The outside of the light guide body 11 is provided with a cladding layer 14, the surfaces of the light guide body 11, the light escape groove 12 and the whispering gallery blocking groove 13 are all attached to the inner surface of the cladding layer 14, the outer surface of the cladding layer 14 is a flat and continuous surface, and the refractive index of the cladding layer 14 is smaller than that of the light guide body 11.
The automatic zeroing initialization method of the current type bidirectional bending sensor driving device comprises the following steps:
s1, naturally straightening the sensor: the current type bidirectional bending sensor is in a natural straightening state;
S2, initial setting: the initialization expected output value Vexpect is set by programming the preset or by using a method of information exchange between an external measurement application device and a driving device through a USB interface, and the initialization expected output value Vexpect is set by adopting the method of programming the preset in the embodiment;
s3, outputting driving voltage information Ud: the core control device checks whether a voltage regulation set value record Urec exists; if the voltage regulation set value record Urec exists, transmitting driving voltage instruction data to the voltage regulation device according to the voltage regulation set value record Urec; if the voltage regulation set value record Urec does not exist, transmitting driving voltage instruction data to the voltage regulation device according to the voltage regulation default value Udefault;
S4, outputting a driving current: the voltage regulating device receives voltage instruction data and outputs driving voltage information Ud, the driving voltage shaping circuit receives the driving voltage information Ud, converts the driving voltage information Ud into driving current and transmits the driving current to the current type bidirectional bending sensor, and the method comprises the following steps:
s4.1, voltage shaping: the driving voltage shaping circuit receives driving voltage information Ud, shapes the driving voltage information Ud and outputs the driving voltage information Ud to the V-I conversion and filtering circuit;
S4.2, V-I conversion filtering: the V-I conversion and filtering circuit receives a driving voltage, converts the driving voltage into a driving current, filters the driving current and transmits the driving current to the driving current output end;
S5, converting sensor output current: the I-V conversion and filtering circuit receives the sensor output current sent by the current type bidirectional bending sensor, converts the sensor output current into output voltage Vout and transmits the output voltage Vout to the voltage acquisition device, and the method comprises the following steps of:
s5.1, I-V conversion: the I-V conversion and filtering circuit receives the sensor output current passing through the sensor output current receiving end, converts the sensor output current into output voltage Vout, filters the output voltage Vout and transmits the output voltage Vout to the voltage acquisition device;
s6, comparing error values: the core control device reads an initialization expected output value Vexpect, an error value epsilon and an output voltage Vout, calculates DeltaV= Vexpect-Vout, compares DeltaV with epsilon, and enters a step of updating a voltage regulation set value record Urec if DeltaV < epsilon;
S7, if the delta V is larger than or equal to epsilon and the delta V is smaller than 0, the core control device reads the adjustment step length delta U and calculates Ud=Ud-delta U, the calculated driving voltage information Ud is output to the voltage regulating device, and then the step of outputting driving current is entered;
S8, if the I delta V I is larger than or equal to epsilon and delta V is larger than 0, the core control device reads the adjustment step length delta U, calculates Ud=Ud+delta U, outputs calculated driving voltage information Ud to the voltage regulating device, and then enters a step of outputting driving current;
S9, updating a voltage regulation set value record Urec: the core control device saves the current driving voltage information Ud to the nonvolatile memory device and replaces the original voltage regulation set value record Urec.
In summary, the invention has the following beneficial effects:
After the driving device is powered on and started, the core control device reads a voltage regulation set value record Urec in the nonvolatile memory device, and transmits driving voltage instruction data to the voltage regulation device according to the voltage regulation set value record Urec, after the voltage regulation device receives the voltage instruction data, the driving voltage regulation device transmits driving voltage information Ud to the driving voltage shaping circuit, and outputs the driving voltage information Ud to the driving voltage shaping circuit according to the voltage regulation set value record Urec, after the driving voltage shaping circuit shapes the driving voltage information Ud, the driving voltage information Ud is output to the V-I conversion and filtering circuit, the V-I conversion and filtering circuit converts driving voltage into driving current and filters the driving current, the driving current is transmitted to the driving current output end, and the driving current is transmitted to the current type bidirectional bending sensor through the driving current output end, so that the driving current type bidirectional bending sensor works.
After the current type bidirectional bending sensor collects information, the sensor output current containing the collected information is conveyed to an I-V conversion and filtering circuit through a sensor output current receiving end, and the I-V conversion and filtering circuit converts the sensor output current into output voltage Vout and transmits the output voltage Vout to a voltage collecting device of the central controller circuit after filtering.
Then, the core control device reads the initialization expected output value Vexpect, the error value epsilon and the output voltage Vout received by the voltage acquisition device in the memory, calculates DeltaV= Vexpect-Vout, compares DeltaV| with epsilon, and if DeltaV| < epsilon, saves the current driving voltage information Ud to the nonvolatile memory device and replaces the original voltage regulation set value record Urec, thereby completing the updating of the voltage regulation set value record Urec. By means of adjusting the driving current, the function of automatically adjusting the circuit parameters is realized, and the effects of improving the measuring efficiency and the production efficiency are achieved. The output of the current-type bi-directional bending sensor is adjusted so that the actual output value is equal to the desired output value. The driving device can realize the function of automatic zero initialization when the current type bidirectional bending sensor is in a natural straightening state, so that the output value of each current type bidirectional bending sensor is consistent in the natural straightening state, and the purpose of eliminating the individual difference of the sensors is directly achieved when the current type bidirectional bending sensor is driven.
In the use process, circuit parameters are not required to be adjusted any more, so that the current type bidirectional bending sensor with different types can be adapted, and the production efficiency and the measurement efficiency are greatly improved.
Information can also be provided for an external measurement application device, so that the external measurement application device can better measure.
The driving device is used as an external measuring application device and an intermediate layer of the current type bidirectional bending sensor, and the external measuring application device and the intermediate layer are connected to form an integral closed loop structure. The decoupling method is essentially used for decoupling the current type bidirectional bending sensor from an external measurement application device, and the initial value of the current type bidirectional bending sensor is uniform no matter how the current type bidirectional bending sensor is replaced for the external measurement application device, so that the idea of closed loop-decoupling can be applied to more application scenes.
When the current type bidirectional bending sensor bends towards one side of the echo wall blocking groove, the output current of the sensor is reduced; when the light escape groove is bent toward one side, the sensor output current increases. Before testing, the current-type bidirectional bending sensor is in a natural straightening state, which means that the initial value of the current-type bidirectional bending sensor is not the minimum value but the median value after the automatic return-to-zero initialization, namely, each current-type bidirectional bending sensor can output approximately equal output voltage Vout under the natural straightening state of using different current-type bidirectional bending sensors, which is basically different from the prior driving devices in the market. Since the data is continuously monotonically changing when the measured object is bent bi-directionally, it is necessary for the measurement of the bi-directional bends to automatically zero the output values of the bi-directional bending sensors in the natural straightened state (the term "zero" as used herein means not that the current or voltage values are zero, but that in a fixed measurement application scenario, the output values Vout-of the bi-directional bending sensors in the natural straightened state-the initial desired output values Vexpect < error epsilon), i.e., in the natural straightened state, each bi-directional bending sensor is capable of outputting approximately equal Vout. The current type bidirectional bending sensor is in a natural straightening state, namely an initial state, and can achieve the effect of convenient measurement.
The voltage regulation set value record Urec is stored in the nonvolatile memory device, and can be reused for next measurement, so that the effects of facilitating measurement and reducing measurement errors are achieved.
The expected output value Vexpect, the adjustment step length delta U, the voltage adjustment set value record Urec and the error value epsilon are initialized through programming, so that the adaptability adjustment can be carried out aiming at different sensors and external measurement application devices, and the effect of improving the applicability can be achieved.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (6)
1. The current type bidirectional bending sensor driving device is characterized in that: the device comprises a central controller circuit, a driving voltage shaping circuit, a V-I conversion and filtering circuit and an I-V conversion and filtering circuit, wherein the central controller circuit comprises a core control device, a nonvolatile memory device, a voltage regulating device, a voltage acquisition device and a communication unit, an initialization expected output value Vexpect, an adjustment step length delta U, a voltage regulation default value Udefault, a voltage regulation set value record Urec and an error value epsilon are stored in the nonvolatile memory device, the core control device is electrically connected with the nonvolatile memory device, the voltage regulating device and the voltage acquisition device, the core control device is in communication connection with the communication unit, two ends of the driving voltage shaping circuit are respectively electrically connected with the voltage regulating device and the V-I conversion and filtering circuit, the V-I conversion and filtering circuit is provided with a driving current output end, the I-V conversion and filtering circuit is electrically connected with the voltage acquisition device of the central controller circuit, and the I-V conversion and filtering circuit is provided with a sensor output current receiving end.
2. The method for initializing an auto-zero of a current bi-directional bend sensor driving apparatus according to claim 1, wherein:
Output drive voltage information Ud: the core control device checks whether a voltage regulation set point record Urec exists; if the voltage regulation set value record Urec exists, transmitting driving voltage instruction data to a voltage regulation device according to the voltage regulation set value record Urec; if the voltage regulation set value record Urec does not exist, driving voltage instruction data are transmitted to a voltage regulation device according to a voltage regulation default value Udefault; output drive current: the voltage regulating device receives voltage instruction data and outputs driving voltage information Ud, the driving voltage shaping circuit receives the driving voltage information Ud, the driving voltage shaping circuit shapes the driving voltage information Ud and then transmits the driving voltage information Ud to the V-I converting and filtering circuit, and the V-I converting and filtering circuit comprises a voltage regulator circuit, a voltage regulator circuit and a voltage regulator circuit, wherein the voltage regulator circuit receives the voltage instruction data and outputs driving voltage information Ud, the driving voltage shaper circuit receives the driving voltage information Ud and then transmits the driving voltage information Ud to the V-I converting and filtering circuit
The conversion and filtering circuit converts the driving voltage information Ud into driving current and transmits the driving current to the current type bidirectional bending sensor;
Converting the sensor output current: the I-V conversion and filtering circuit receives a sensor output current sent by the current type bidirectional bending sensor, converts the sensor output current into an output voltage Vout and transmits the output voltage Vout to the voltage acquisition device;
Error value comparison: the core control device reads an initialization expected output value Vexpect, an error value epsilon and an output voltage Vout, calculates DeltaV= Vexpect-Vout, compares DeltaV with epsilon, and enters a step of updating a voltage regulation set value record Urec if DeltaV < epsilon;
updating the voltage regulation setting value record Urec: the core control device stores the current driving voltage information Ud to a nonvolatile memory device and replaces the original voltage regulation set value record Urec.
3. The method for initializing the automatic return-to-zero of the current-type bi-directional bending sensor driving device according to claim 2, wherein: in the step of comparing error values, the method further comprises the steps of: if the delta V is larger than epsilon and the delta V is smaller than 0, the core control device reads the adjustment step length delta U and calculates Ud=Ud-delta U, the calculated driving voltage information Ud is output to the voltage regulating device, and then the step of outputting driving current is entered.
4. The method for initializing the automatic return-to-zero of the current-type bi-directional bending sensor driving device according to claim 2, wherein: in the step of comparing error values, the method further comprises the steps of: if the delta V is larger than epsilon and the delta V is larger than 0, the core control device reads the adjustment step length delta U, calculates Ud=Ud+delta U, outputs calculated driving voltage information Ud to the voltage regulating device, and then enters the step of outputting driving current.
5. The method for initializing the automatic return-to-zero of the current-type bi-directional bending sensor driving device according to claim 2, wherein: before the step of outputting the driving voltage information Ud, the method further comprises the steps of:
The sensor straightens naturally: the current type bidirectional bending sensor is in a natural straightening state.
6. The method for initializing the automatic return-to-zero of the current-type bi-directional bending sensor driving device according to claim 2, wherein: before the step of outputting the driving voltage information Ud, the method further comprises the steps of:
Initial setting: the expected output value Vexpect, the adjustment step length DeltaU, the voltage regulation set value record Urec and the error value epsilon are initialized through programming preset.
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