CN201569409U - Transformer-type non-contact angle sensor - Google Patents
Transformer-type non-contact angle sensor Download PDFInfo
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- CN201569409U CN201569409U CN2009202940798U CN200920294079U CN201569409U CN 201569409 U CN201569409 U CN 201569409U CN 2009202940798 U CN2009202940798 U CN 2009202940798U CN 200920294079 U CN200920294079 U CN 200920294079U CN 201569409 U CN201569409 U CN 201569409U
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Abstract
The utility model discloses a transformer-type non-contact angle sensor, comprising an oscillation driving circuit and a variable-voltage sensor, wherein the variable-voltage sensor is provided with a magnet exciting coil and an induction coil; furthermore, the magnet exciting coil and the induction coil are sheathed with a same magnetizer; the output terminal of the oscillation driving circuit is connected on the magnet exciting coil of the variable-voltage sensor; and the induction coil is connected on a processing circuit, the output terminal of which is connected with a first output circuit. The transformer-type non-contact angle sensor is characterized in that the processing circuit is a peak detection circuit and has the obvious effects of reducing coil turns of the transformer, leading the sensor to be miniaturized, having low power dissipation, low temperature drift and excellent performances, and leading the transformer-type sensor to be manufactured more conveniently and to be applied to more conditions. The transformer-type non-contact angle sensor with large displaying scope and customized output curve can be applicable to the detection on various angular displacements, meet the angular displacement detection requirement of different radians, and can prepare the output linearity according to the requirements.
Description
Technical field
The utility model belongs to sensor technical field, specifically, is a kind of transformer type sensor special circuit.
Background technology
Differential transformer transducer, be the device that tested non electrical quantity change transitions is changed for the coil mutual induction amount. this sensor mainly is to make according to the principle of transformer, because such sensor has advantages such as simple in structure, sensitivity height, is widely used in the measurement of displacement.The coil of transformer type sensor is output as AC signal, need could effectively utilize by circuit conversion and processing.Traditional scheme is to adopt phase-sensitive detection circuit that diode constitutes or frequency modulation, phase modulation circuit or the like.
But these circuit still have several remarkable shortcomings: the one, and poor sensitivity, the coil of the enough numbers of turn of needs, for example 2000 circles just can be handled preferably.Coil turn is too much, causes the volume of sensor to dwindle.
The 2nd, temperature is floated bigger.Because coil turn is abundant, along with variation of temperature, the internal resistance of coil changes greatly, becomes the one of the main reasons that causes that output changes.Therefore, generally need to adopt differential structure to offset temperature and float phenomenon.Differential structure needs the loop construction of symmetry, and complexity and technology difficulty that this has increased sensor have further increased sensor bulk.
The 3rd, curve of output is single.Because having adopted differential structure, its output signal is the difference of two groups of coils, linearly the type signal.For the curve of output of other type, for example exponential type, broken line type then are difficult to realize.
The utility model content
The purpose of this utility model provides a kind of transformer type noncontact angular transducer, can reduce the coil turn of transformer, the miniaturization that makes sensor, low-power consumption, low temperature and float.
For achieving the above object, the utility model provides a kind of transformer type noncontact angular transducer, be provided with concussion driving circuit and transformation sensor, wherein the transformation sensor is provided with field coil and inductive coil, and be set with same magnetic conductor in field coil and the inductive coil, the output terminal of described concussion driving circuit is connected on the field coil of described transformation sensor, described inductive coil is connected on the treatment circuit, the output terminal of this treatment circuit is connected with first output circuit, and its key is: described treatment circuit is a peak detection circuit.
Described field coil and inductive coil are installed on the same base, and described field coil and inductive coil be circular arc, and described magnetic conductor is a circular arc magnetic conduction bar.
Also be fixed with coil rack on the described base, have passage in this coil rack, described magnetic conductor stretches in the passage, and described inductive coil is wrapped on this coil rack.
Base is based on printed circuit board (PCB), and coil rack can be a circular arc skeleton, also can be that the little skeleton of a plurality of weak points is welded on the circuit board by the circular arc arrangement, adopts thin enameled wire or suitcase line to be wrapped on the coil rack, just forms the circular arc coil.
The xsect of described coil rack is " U " shape or " O " shape or " n " shape.
Coil rack has various ways, is convenient to the space that the circular arc magnetic conductor rotates as long as can be provided with one in skeleton, can get final product by winding around outside skeleton.
The xsect of described coil rack is descending or ascending, and the xsect of this coil rack coil is also descending or ascending.
The xsect of coil changes, and can adjust the output linearity of inductive coil.
Described magnetic conductor is by two-layer at least magnetic conduction bar overlapping composition, and the length that stretches between adjacent magnetic conduction bar in the described inductive coil increases progressively successively.
The magnetic stripe of different length can be adjusted the output linearity of inductive coil.
Described inductive coil density cooperation is wound on the described coil rack.
Coil can be dredged or density mode coiling at interval according to close, preceding close back, preceding thin back, the coiling of also can dividing into groups, and promptly multiturn lead coiled is one group, and group is that density is different with gap between organizing, can adjust the output linearity of inductive coil so as required.Known curve of output control technology is to adopt the differential type loop construction.With solenoid type differential type coil is example, on the straight barrel type screwed pipe of hollow, field coil is evenly around full screwed pipe, inductive coil is then around the field coil skin, be divided into some groups of the left and right sides, each group is symmetrical coiling, and the difference of utilizing the symmetric coil signal is as curve of output, but technique known output all is linear, yet there are no the report of other special curve of output.It is linear that the utility model is controlled output by the rule that changes the turn-to-turn distance, and novel and practical, this is than all more easy, more easy to control costs of output regulative mode such as single-chip microcomputer, computing circuits.
Described magnetic conductor to the minimum air line distance of inductive coil greater than 1mm.
Also be fixed with second magnetic inductive block in the described coil rack, this second magnetic inductive block is near the running orbit of described magnetic conductor.
Described second magnetic inductive block is positioned at the end of the running orbit of described magnetic conductor.
Second magnetic inductive block is fixed on formulates the position, and when magnetic conductor advanced to this position, subsequent conditioning circuit identification was convenient in the induced signal generation cataclysm on the inductive coil.
Described magnetic conductor is by two-layer at least magnetic conduction bar overlapping composition, and the length that stretches between adjacent magnetic conduction bar in the described inductive coil increases progressively successively.
The magnetic stripe of different length can be adjusted the output linearity of inductive coil.
Be positioned at described inductive coil magnetic conductor in addition and be connected with support arm, on this support arm rotating shaft is installed, this rotating shaft is positioned at the circular arc circle centre position of described magnetic conductor.
Be fixed with master arm in the described rotating shaft, be fixed with left and right limited block on the described base, wherein the left limit piece is positioned at the left end of described master arm motion track, and the right limit piece is positioned at the right-hand member of described master arm motion track, and described left and right limited block limits the moving range of described master arm.
Left and right limited block limits the moving range of described support arm.Also limit the oscillating stroke of magnetic conductor, avoided the stroke of magnetic conductor to transfinite.
Described field coil also can be fixed on the magnetic conductor or on the support arm or in the rotating shaft.
Make support arm and rotating shaft with magnetic conductor, just can be fixed on the support arm field coil or rotating shaft, as long as it is just passable most magnetic lines of force to be introduced magnetic conductor.Field coil is connected with signal source through active wire.
Also can fix magnetic stripe, skeleton and inductive coil are fixed on the support arm, rotating shaft drives the support arm rotation, and inductive coil is connected with active line on being welded on circuit board.
Described concussion driving circuit is a pulse-switching circuit, and this pulse-switching circuit is the rect.p. driving circuit that single-chip microcomputer sends, or is RC concussion pulse driving circuit, or the peak pulse driving circuit for exporting after the exchange current coupling capacitance.
The waveform that drives field coil in the known technology is sinusoidal wave, or triangular wave, or sawtooth wave, these wave form varies are mild, can reduce the secondary induction distorted signals, but do also defectiveness like this: mild waveform makes that the induction amplitude of coil is very low, and, because what form in the coil is the continuous gradation electric current, its average power consumption is bigger; And the utility model adopts pulse-switching circuit, and the electric current in the coil turn-offs rapidly after reaching peak value, and average power consumption is obviously reduced.Adopt pulse-switching circuit simultaneously the electric current in the coil is changed rapidly, can reach higher induction peak value,, can not influence sensor performance though this can cause distortion.
Pulse generating circuit has varied, but all is mature technology.As long as according to actual conditions needs and crest voltage, enough satisfy the driving energy of subsequent conditioning circuit, it is just passable to dispose suitable dutycycle.
According to traditional technical scheme, because there is decay in the induced signal of field coil and inductive coil, if promote the amplitude of secondary output signal, first scheme is to increase the number of turn of coil to reduce decay, but can increase structural volume, alternative plan like this is to improve elementary driving voltage, but can increase power consumption like this, two schemes have all caused adverse effect.
And employing the utility model, owing to use pulse-switching circuit to drive, field coil electric current in most time is zero, if promote the instantaneous voltage amplitude of field coil, influence to average power consumption is very little, but the induction output signal of inductive coil just can get a promotion.Adopt the utility model, can reduce the number of turn of coil, reduce to hundreds of circles even tens of circle from thousands of circles.So just simplify the structure of transformer, reduced the volume of transformer.
In order to handle the output signal of inductive coil better, the utility model has further adopted peak detection circuit, described peak detection circuit is provided with amplifier, the positive input of this amplifier connects described inductive coil, the positive pole of output terminating diode, ground connection behind negative pole string first resistance of this diode, the negative pole of this diode also connects the front end of second resistance, the negative input of the described amplifier of back termination of this second resistance, the rear end of this second resistance also crosstalk holds back ground connection, described first output circuit of the back termination of this second resistance.
The resistance of described first resistance is more than or equal to second resistance.
First resistance can increase the output current of amplifier, and makes diode except to the electric capacity charging, also has another current path, to prevent that amplifier and diode operation under little current-mode, causing instability.Simultaneously, the first resistance double as capacitance discharges loop, at this moment, first resistance should make electric capacity realize rapid charge, slowly discharge greater than second resistance.The temperature characterisitic of this peak detection circuit is desirable especially, also can handle other signal of mV level.In traditional peak detection circuit that constitutes by amplifier, first resistance is not set, its effect is not ideal enough.
Traditional transformer formula sensor adopts phase-sensitive detection circuit.Phase-sensitive detection circuit mainly is constituted by a diode, and is well known that, there is cut-off voltage in diode, during less than 600mV, diode ends, accurately processing signals in the coil output signal, therefore, still need more coil turn, enough big with the amplitude that guarantees secondary output voltage.In addition, the temperature characterisitic of diode does not match, and can cause phase-sensitive detection circuit output temperature to float yet.
Further analyze the working method of described peak detection circuit, performance characteristic according to short principle of the void of amplifier and amplifier, if the positive input of amplifier is accepted AC signal, after this AC signal upset zero passage, the output terminal of amplifier needs the elapsed-time standards t zero passage of could overturning, and the output voltage of amplifier rises with the slope less than 90 degree, because the output voltage of amplifier also feeds back to negative input, then this feedback voltage is after reaching input voltage value, the output voltage of amplifier just no longer raises, but follows the variation of input voltage.Be connected under the situation of electric capacity, the output voltage of amplifier charges to electric capacity, makes electric capacity keep this magnitude of voltage, has realized that then peak value detects and the process of output.
Therefore, when forming the spike induced voltage in coil, described peak detection circuit can not be exported equal peak voltage immediately, but after waiting for that this peak voltage descends, exports the voltage than low amplitude value.Even so, this voltage is still higher than the voltage that traditional sine wave, triangular wave, sawtooth wave form.
By adjusting the impedance of electric capacity charging, discharge path, realize the suitable time scale that discharges and recharges, can obtain to be similar to the output characteristics of direct current.In the utility model, the impedance of charging path is much smaller than the impedance of discharge path, can make the voltage fast rise at electric capacity two ends, slowly decline, when peak detection signal reached peak value, electric capacity was also quickly charged to mxm., subsequently, peak detection signal descends, but the capacitance discharges path presents high resistant, and electric capacity just can continue to keep this mxm., just slowly descend, its decline rate can be ignored.When next pulse arrived, this slight fall can be elevated to peak value once more because of charging, therefore, can form the signal that approximate d. c. voltage signal output output is similar to direct current.
The output voltage of described peak detection circuit is similar to direct current, can be used to control various types of voltage-controlled type circuit, comprises voltage transitions, current conversion V/I, frequency inverted, and its application is very extensive.
With the output voltage of peak detection circuit, be used to control the V/I change-over circuit, promptly can be used for the current-output type sensor circuit.
Described first output circuit is provided with the first output amplifier, the positive input of this first output amplifier connects the output terminal of described peak detection circuit, this first output amplifier output terminal is connected with the base stage of first triode, the current collection of this first triode is the output terminal of first output circuit very, the collector of this first triode also connects positive supply, ground connection behind emitter string the 3rd resistance of this first triode, the emitter of this first triode also are connected with the negative input of the described first output amplifier.
In order to reach more performance, can insert at the negative input of the first output amplifier and be slightly larger than zero voltage, make the first output amplifier reverse bias, in order to avoid when peak detection circuit is output as small-signal, because the offset voltage of amplifier causes error.
On current-output type sensing circuit basis, increase one or more groups reference voltage and current expansioning circuit, can reach special application, as second output circuit.
The output terminal of described peak detection circuit also is connected with second output circuit, this second output circuit is provided with the second output amplifier, the negative input of this second output amplifier is connected with reference voltage, the positive input of this second output amplifier connects the output terminal of described peak detection circuit, this second output amplifier output terminal is connected with the base stage of second triode, the collector of this second triode is connected the grounded emitter of second triode with the output terminal of described first output circuit or the emitter of first triode.
Second output circuit is set, can realizes special sensor performance.For example: sensor need be realized 0 to 70mA continuous variation output current, and after reaching 70mA, can saltus step to 80mA.In the utility model, 0 to 70mA continuous variation output current then realizes that by first output circuit when the output voltage of peak detection circuit changed continuously, first output circuit then can be exported the continually varying electric current.After the output voltage of peak detection circuit reached reference voltage level, the then conducting of second output circuit realized the function of saltus step to 80mA.
Second kind of special application is: the emitter of described second triode also is connected by the negative input of resistance with the described second output amplifier, such second output amplifier also works in feedback states, also can be according to the Signal Regulation output current of peak detection circuit.
Illustrate at second kind of special applicating example: require sensor to realize 0 to 80mA continuous variation output current, but wherein 0 to 30mA precision will reach 1%, 30 to 80mA precision is only with reaching 5%, when little electric current, in order to reach 1% precision, the first output circuit conducting, second output circuit does not end owing to signal intensity reaches reference voltage.At this moment, R3 should be adjusted to enough greatly guaranteeing the sensitivity to electric current, but the increase of R3 resistance will make the loop at R3 place have a maximum current, in this example, this maximum current can not reach 80mA.After signal intensity reaches reference voltage, the second output circuit conducting, current output sensor is expanded, R4 wherein will adjust to enough little, just can make sensor continue output 30 to 80mA, will increase the current error in loop, R4 place though R4 diminishes, but 30 to 80mA interval, accuracy requirement is also corresponding to be reduced to 5%, therefore, can satisfy fully.
The example of second kind of special applications is common in the requirement of fuel level sensor to current signal.
By that analogy, can be provided with the 3rd, the 4th even more output circuit.
Described inductive coil is the simplex winding coil.
Traditional circuit need mate with differential-type, double winding inductive coil.This circuit can mate with the simplex winding inductive coil, can reach equal performance.
Ground connection behind emitter string the 4th resistance of second triode.
The emitter crosstalk resistance of described second triode is connected with the negative input of the described second output amplifier.
The resistance of described the 4th resistance is less than or equal to the 3rd resistance.Be in order to make the current expansion effect obvious, to reach requirement.
Above-mentioned pulse-switching circuit, peak detection circuit are used in the lump, can constitute basic electronic circuit of the present utility model.Because this circuit do not need too high inductive coil output voltage, therefore, coil turn is reduced, thereby the temperature that coil is caused is floated minimizing, even do not adopt differential type output, also can realize that down＜3% temperature floats at 0 to 80 degree centigrade.
Remarkable result of the present utility model is: a kind of transformer type noncontact angular transducer is provided, can reduces the coil turn of transformer, the miniaturization that makes sensor, low-power consumption, low temperature and float.Not only possess premium properties, transformer type sensor can be made more easily, and can be applied in the more condition.Scale range of the present utility model is big, the customizable transformer type angle sensing device of curve of output, can be applicable to the detection of various angular displacements.The angle displacement that satisfies different radians detects needs, and its output linearity also can be provided with making as required.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is the circuit theory diagrams of peak detection circuit;
Fig. 3 is the circuit theory diagrams of first, second output circuit;
Fig. 4 is the waveform comparison diagram of pulse waveform and traditional oscillating circuit;
Fig. 5 is the voltage follow curve comparison diagram that pulse waveform and traditional circuit are exported through amplifier;
Fig. 6 is the output waveform figure of peak detection circuit.
Fig. 7 is the structural representation of transformation sensor;
Fig. 8 is the scheme of installation of a plurality of coil racks;
Fig. 9 is the scheme of installation of limited block;
Figure 10 is the scheme of installation of second magnetic inductive block;
Figure 11 is the structural representation that the coil rack xsect changes;
Figure 12 is the structural representation that the transformation sensor adopts runing rest;
Curve of output synoptic diagram when Figure 13 is the even coiling of transformation sensor sensing coil;
The curve of output synoptic diagram that Figure 14 is a transformation sensor sensing coil when dredging to close coiling;
Curve of output synoptic diagram when Figure 15 is transformation sensor sensing coil grouping coiling.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As shown in Figure 1: a kind of transformer type noncontact angular transducer, be provided with concussion driving circuit 11 and transformation sensor, wherein the transformation sensor is provided with field coil 1 and inductive coil 2, and be set with same magnetic conductor 3 in field coil 1 and the inductive coil 2, the output terminal of described concussion driving circuit 11 is connected on the field coil 1 of described transformation sensor, described inductive coil 2 is connected on the treatment circuit, the output terminal of this treatment circuit is connected with first output circuit 14, and its key is: described treatment circuit is a peak detection circuit 13.
Described field coil 1 and inductive coil 2 are installed on the same base, and described field coil 1 and inductive coil 2 be circular arc, and described magnetic conductor 3 is a circular arc magnetic conduction bar.
Also be fixed with coil rack 4 on the described base 7, have passage in this coil rack 4, described magnetic conductor 3 stretches in the passage, and described inductive coil 2 is wrapped on this coil rack 4.
Base is based on printed circuit board (PCB), and coil rack can be a circular arc skeleton, also can be that the little skeleton of a plurality of weak points is welded on the circuit board by the circular arc arrangement, adopts thin enameled wire or suitcase line to be wrapped on the coil rack, just forms the circular arc coil.
The xsect of described coil rack is " U " shape or " O " shape or " n " shape.
Coil rack has various ways, is convenient to the space that the circular arc magnetic conductor rotates as long as can be provided with one in skeleton, can get final product by winding around outside skeleton.
The xsect of described coil rack 4 is descending or ascending, and the xsect of these coil rack 4 coils is also descending or ascending.
The xsect of coil changes, and can adjust the output linearity of inductive coil.
Described magnetic conductor is by two-layer at least magnetic conduction bar overlapping composition, and the length that stretches between adjacent magnetic conduction bar in the described inductive coil increases progressively successively.
The magnetic stripe of different length can be adjusted the output linearity of inductive coil.
Described inductive coil 2 densitys cooperation is wound on the described coil rack 4.
Coil can be dredged or density mode coiling at interval according to close, preceding close back, preceding thin back, the coiling of also can dividing into groups, and promptly multiturn lead coiled is one group, and group is that density is different with gap between organizing, can adjust the output linearity of inductive coil so as required.Known curve of output control technology is to adopt the differential type loop construction.With solenoid type differential type coil is example, on the straight barrel type screwed pipe of hollow, field coil is evenly around full screwed pipe, inductive coil is then around the field coil skin, be divided into some groups of the left and right sides, each group is symmetrical coiling, and the difference of utilizing the symmetric coil signal is as curve of output, but technique known output all is linear, yet there are no the report of other special curve of output.It is linear that the utility model is controlled output by the rule that changes the turn-to-turn distance, and novel and practical, this is than all more easy, more easy to control costs of output regulative mode such as single-chip microcomputer, computing circuits.
Described magnetic conductor to the minimum air line distance of inductive coil greater than 1mm.
Also be fixed with second magnetic inductive block 9 in the described coil rack 4, this second magnetic inductive block 9 is near the running orbit of described magnetic conductor 3.
Described second magnetic inductive block is positioned at the end of the running orbit of described magnetic conductor.
Second magnetic inductive block is fixed on formulates the position, and when magnetic conductor advanced to this position, subsequent conditioning circuit identification was convenient in the induced signal generation cataclysm on the inductive coil.
Described magnetic conductor 3 is by two-layer at least magnetic conduction bar overlapping composition, and the length that stretches between adjacent magnetic conduction bar in the described inductive coil 2 increases progressively successively.
The magnetic stripe of different length can be adjusted the output linearity of inductive coil.
Be positioned at described inductive coil 2 magnetic conductor 3 in addition and be connected with support arm 6, on this support arm 6 rotating shaft 5 is installed, this rotating shaft 5 is positioned at the circular arc circle centre position of described magnetic conductor 3.
Be fixed with master arm 10 in the described rotating shaft 5, be fixed with left and right limited block 8,8 ' on the described base 7, wherein left limit piece 8 is positioned at the left end of described master arm 10 motion tracks, right limit piece 8 ' is positioned at the right-hand member of described master arm 10 motion tracks, the moving range of described left and right limited block 8, the described master arm 10 of 8 ' restriction.
The moving range of left and right limited block 8, the described support arm of 8 ' restriction.Also limit the oscillating stroke of magnetic conductor, avoided the stroke of magnetic conductor to transfinite.
Described field coil also can be fixed on the magnetic conductor or on the support arm or in the rotating shaft.
Make support arm and rotating shaft with magnetic conductor, just can be fixed on the support arm field coil or rotating shaft, as long as it is just passable most magnetic lines of force to be introduced magnetic conductor.Field coil is connected with signal source through active wire.
Also can fix magnetic stripe, skeleton and inductive coil are fixed on the support arm, rotating shaft drives the support arm rotation, and inductive coil is connected with active line on being welded on circuit board.
Described concussion driving circuit 11 is a pulse-switching circuit, and this pulse-switching circuit is the rect.p. driving circuit that single-chip microcomputer sends, or is RC concussion pulse driving circuit, or the peak pulse driving circuit for exporting after the exchange current coupling capacitance.
The waveform that drives field coil in the known technology is sinusoidal wave, or triangular wave, or sawtooth wave, these wave form varies are mild, can reduce the secondary induction distorted signals, but do also defectiveness like this: mild waveform makes that the induction amplitude of coil is very low, and, because what form in the coil is the continuous gradation electric current, its average power consumption is bigger; And the utility model adopts pulse-switching circuit, and the electric current in the coil turn-offs rapidly after reaching peak value, and average power consumption is obviously reduced.Adopt pulse-switching circuit simultaneously the electric current in the coil is changed rapidly, can reach higher induction peak value,, can not influence sensor performance though this can cause distortion.
Pulse generating circuit has varied, but all is mature technology.As long as according to actual conditions needs and crest voltage, enough satisfy the driving energy of subsequent conditioning circuit, it is just passable to dispose suitable dutycycle.
According to traditional technical scheme, because there is decay in the induced signal of field coil and inductive coil, if promote the amplitude of secondary output signal, first scheme is to increase the number of turn of coil to reduce decay, but can increase structural volume, alternative plan like this is to improve elementary driving voltage, but can increase power consumption like this, two schemes have all caused adverse effect.
And employing the utility model, owing to use pulse-switching circuit to drive, field coil electric current in most time is zero, if promote the instantaneous voltage amplitude of field coil, influence to average power consumption is very little, but the induction output signal of inductive coil just can get a promotion.Adopt the utility model, can reduce the number of turn of coil, reduce to hundreds of circles even tens of circle from thousands of circles.So just simplify the structure of transformer, reduced the volume of transformer.
In order to handle the output signal of inductive coil better, the utility model has further adopted peak detection circuit, described peak detection circuit is provided with amplifier, the positive input of this amplifier connects described inductive coil, the positive pole of output terminating diode, ground connection behind negative pole string first resistance of this diode, the negative pole of this diode also connects the front end of second resistance R 2, the negative input of the described amplifier of back termination of this second resistance R 2, the rear end of this second resistance R 2 also crosstalk holds ground connection behind the C, described first output circuit of the back termination of this second resistance R 2.
The resistance of described first resistance R 1 is more than or equal to second resistance R 2.
First resistance can increase the output current of amplifier, and makes diode except to the capacitor C charging, also has another current path, to prevent that amplifier and diode operation under little current-mode, causing instability.Simultaneously, the discharge loop of the first resistance double as capacitor C, at this moment, first resistance should make capacitor C realize rapid charge, slowly discharge greater than second resistance R 2.The temperature characterisitic of this peak detection circuit is desirable especially, also can handle other signal of mV level.In traditional peak detection circuit that constitutes by amplifier, first resistance is not set, its effect is not ideal enough.
Traditional transformer formula sensor adopts phase-sensitive detection circuit.Phase-sensitive detection circuit mainly is constituted by a diode, and is well known that, there is cut-off voltage in diode, during less than 600mV, diode ends, accurately processing signals in the coil output signal, therefore, still need more coil turn, enough big with the amplitude that guarantees secondary output voltage.In addition, the temperature characterisitic of diode does not match, and can cause phase-sensitive detection circuit output temperature to float yet.
Further analyze the working method of described peak detection circuit, performance characteristic according to short principle of the void of amplifier and amplifier, if the positive input of amplifier is accepted AC signal, after this AC signal upset zero passage, the output terminal of amplifier needs the elapsed-time standards t zero passage of could overturning, and the output voltage of amplifier rises with the slope less than 90 degree, because the output voltage of amplifier also feeds back to negative input, then this feedback voltage is after reaching input voltage value, the output voltage of amplifier just no longer raises, but follows the variation of input voltage.Be connected under the situation of electric capacity, the output voltage of amplifier charges to electric capacity, makes electric capacity keep this magnitude of voltage, has realized that then peak value detects and the process of output.
Therefore, when forming the spike induced voltage in coil, described peak detection circuit can not be exported equal peak voltage immediately, but after waiting for that this peak voltage descends, exports the voltage than low amplitude value.Even so, this voltage is still higher than the voltage that traditional sine wave, triangular wave, sawtooth wave form.
By adjusting the impedance of electric capacity charging, discharge path, realize the suitable time scale that discharges and recharges, can obtain to be similar to the output characteristics of direct current.In the utility model, the impedance of charging path is much smaller than the impedance of discharge path, can make the voltage fast rise at electric capacity two ends, slowly decline, when peak detection signal reached peak value, electric capacity was also quickly charged to mxm., subsequently, peak detection signal descends, but the capacitance discharges path presents high resistant, and electric capacity just can continue to keep this mxm., just slowly descend, its decline rate can be ignored.When next pulse arrived, this slight fall can be elevated to peak value once more because of charging, therefore, can form the signal that approximate d. c. voltage signal output output is similar to direct current.
The output voltage of described peak detection circuit is similar to direct current, can be used to control various types of voltage-controlled type circuit, comprises voltage transitions, current conversion V/I, frequency inverted, and its application is very extensive.
With the output voltage of peak detection circuit, be used to control the V/I change-over circuit, promptly can be used for the current-output type sensor circuit.
Described first output circuit 14 is provided with the first output amplifier U1, the positive input of this first output amplifier U1 connects the output terminal of described peak detection circuit 13, this first output amplifier U1 output terminal is connected with the base stage of the first triode Q1, the current collection of this first triode Q1 is the output terminal of first output circuit 14 very, the collector of this first triode Q1 also connects positive supply, emitter string the 3rd resistance R 3 back ground connection of this first triode Q1, the emitter of this first triode Q1 also is connected with the negative input of the described first output amplifier U1.
In order to reach more performance, can insert at the negative input of the first output amplifier U1 and be slightly larger than zero voltage, make the first output amplifier U1 reverse bias, in order to avoid when peak detection circuit is output as small-signal, because the offset voltage of amplifier causes error.
On current-output type sensing circuit basis, increase one or more groups reference voltage and current expansioning circuit, can reach special application, as second output circuit 15.
The output terminal of described peak detection circuit 13 also is connected with second output circuit 15, this second output circuit 15 is provided with the second output amplifier U2, the negative input of this second output amplifier U2 is connected with reference voltage, the positive input of this second output amplifier U2 connects the output terminal of described peak detection circuit 13, this second output amplifier U2 output terminal is connected with the base stage of the second triode Q2, the collector of this second triode Q2 is connected the grounded emitter of the second triode Q2 with the output terminal of described first output circuit 14 or the emitter of the first triode Q1.
Second kind of special application is: the emitter of the described second triode Q2 also is connected by the negative input of resistance R 100 with the described second output amplifier U2, such second output amplifier U2 also works in feedback states, also can be according to the Signal Regulation output current of peak detection circuit.
Illustrate at second kind of special applicating example: require sensor to realize 0 to 80mA continuous variation output current, but wherein 0 to 30mA precision will reach 1%, 30 to 80mA precision is only with reaching 5%, when little electric current, in order to reach 1% precision, the first output circuit conducting, second output circuit 15 does not end owing to signal intensity reaches reference voltage.At this moment, R3 should be adjusted to enough greatly guaranteeing the sensitivity to electric current, but the increase of R3 resistance will make the loop at R3 place have a maximum current, in this example, this maximum current can not reach 80mA.After signal intensity reaches reference voltage, 15 conductings of second output circuit, current output sensor is expanded, R4 wherein will adjust to enough little, just can make sensor continue output 30 to 80mA, will increase the current error in loop, R4 place though R4 diminishes, but 30 to 80mA interval, accuracy requirement is also corresponding to be reduced to 5%, therefore, can satisfy fully.
The example of second kind of special applications is common in the requirement of fuel level sensor to current signal.
By that analogy, can be provided with the 3rd, the 4th even more output circuit.
Described inductive coil is the simplex winding coil.
Traditional circuit need mate with differential-type, double winding inductive coil.This circuit can mate with the simplex winding inductive coil, can reach equal performance.
Emitter string the 4th resistance R 4 back ground connection of the second triode Q2.
The emitter crosstalk resistance R100 of the described second triode Q2 is connected with the negative input of the described second output amplifier U2.
The resistance of described the 4th resistance R 4 is less than or equal to the 3rd resistance R 3.Be in order to make the current expansion effect obvious, to reach requirement.
Above-mentioned pulse-switching circuit, peak detection circuit are used in the lump, can constitute basic electronic circuit of the present utility model.Because this circuit do not need too high inductive coil output voltage, therefore, coil turn is reduced, thereby the temperature that coil is caused is floated minimizing, even do not adopt differential type output, also can realize that down＜3% temperature floats at 0 to 80 degree centigrade.
Although above structure is described preferred embodiment of the present utility model in conjunction with the accompanying drawings; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic rather than determinate; those of ordinary skill in the art is under enlightenment of the present utility model; under the prerequisite of the utility model aim and claim; can make multiple similar expression; as change the kind of pulse-switching circuit and pulse-switching circuit; changing triode is modes such as field effect transistor; as change coil rack quantity and arc angle; change the coil rack shape; change the coil-winding structure and the number of plies; the number of plies of magnetic conduction bar changes; multiple permeability magnetic material is arranged in pairs or groups mutually; the length of each layer magnetic conduction bar differs; mode such as overlapped, such conversion all falls within the protection domain of the present utility model.
Claims (17)
1. transformer type noncontact angular transducer, be provided with concussion driving circuit (11) and transformation sensor, wherein the transformation sensor is provided with field coil (1) and inductive coil (2), and be set with same magnetic conductor (3) in field coil (1) and the inductive coil (2), the output terminal of described concussion driving circuit (11) is connected on the field coil (1) of described transformation sensor, described inductive coil (2) is connected on the treatment circuit, the output terminal of this treatment circuit is connected with first output circuit (14), it is characterized in that: described treatment circuit is peak detection circuit (13).
2. transformer type noncontact angular transducer according to claim 1, it is characterized in that: described field coil (1) and inductive coil (2) are installed on the same base, and described field coil (1) and inductive coil (2) are circular arc, and described magnetic conductor (3) is a circular arc magnetic conduction bar.
3. transformer type noncontact angular transducer according to claim 2, it is characterized in that: also be fixed with coil rack (4) on the described base (7), this coil rack has passage in (4), described magnetic conductor (3) stretches in the passage, and described inductive coil (2) is wrapped on this coil rack (4).
4. transformer type angle sensing device according to claim 3 is characterized in that: the xsect of described coil rack (4) is descending or ascending, and the xsect of this coil rack (4) coil is also descending or ascending.
5. transformer type angle sensing device according to claim 2 is characterized in that: the cooperation of described inductive coil (2) density is wound on the described coil rack (4).
6. transformer type angle sensing device according to claim 2 is characterized in that: also be fixed with second magnetic inductive block (9) in the described coil rack (4), this second magnetic inductive block (9) is near the running orbit of described magnetic conductor (3).
7. transformer type angle sensing device according to claim 1 and 2 is characterized in that: described magnetic conductor (3) is by two-layer at least magnetic conduction bar overlapping composition, and the length that stretches between adjacent magnetic conduction bar in the described inductive coil (2) increases progressively successively.
8. transformer type angle sensing device according to claim 1 and 2, it is characterized in that: be positioned at described inductive coil (2) magnetic conductor (3) in addition and be connected with support arm (6), rotating shaft (5) is installed on this support arm (6), and this rotating shaft (5) is positioned at the circular arc circle centre position of described magnetic conductor (3).
9. transformer type angle sensing device according to claim 8, it is characterized in that: be fixed with master arm (10) in the described rotating shaft (5), be fixed with left and right limited block (8,8 ') on the described base (7), wherein left limit piece (8) is positioned at the left end of described master arm (10) motion track, right limit piece (8 ') is positioned at the right-hand member of described master arm (10) motion track, and described left and right limited block (8,8 ') limits the moving range of described master arm (10).
10. transformer type noncontact angular transducer according to claim 1, it is characterized in that: described concussion driving circuit (11) is a pulse-switching circuit, this pulse-switching circuit is the rect.p. driving circuit that single-chip microcomputer sends, or be RC concussion pulse driving circuit, or peak pulse driving circuit for exporting after the exchange current coupling capacitance.
11. transformer type noncontact angular transducer according to claim 1, it is characterized in that: described peak detection circuit (13) is provided with amplifier (U), the positive input of this amplifier (U) connects described inductive coil (2b), the positive pole of output terminating diode (D), negative pole string first resistance (R1) the back ground connection of this diode (D), the negative pole of this diode (D) also connects the front end of second resistance (R2), the negative input of the described amplifier of back termination (U) of this second resistance (R2), the rear end of this second resistance (R2) also crosstalk holds (C) back ground connection, described first output circuit of the back termination of this second resistance (R2) (14).
12. according to the described peak detection circuit of claim 11 (13), it is characterized in that: the resistance of described first resistance (R1) is more than or equal to second resistance (R2).
13. transformer type noncontact angular transducer according to claim 1, it is characterized in that: described first output circuit (14) is provided with the first output amplifier (U1), the positive input of this first output amplifier (U1) connects the output terminal of described peak detection circuit (13), this first output amplifier (U1) output terminal is connected with the base stage of first triode (Q1), the current collection of this first triode (Q1) is the output terminal of first output circuit (14) very, the collector of this first triode (Q1) also connects positive supply, emitter string the 3rd resistance (R3) the back ground connection of this first triode (Q1), the emitter of this first triode (Q1) also is connected with the negative input of the described first output amplifier (U1).
14. transformer type noncontact angular transducer according to claim 1, it is characterized in that: the output terminal of described peak detection circuit (13) also is connected with second output circuit (15), this second output circuit (15) is provided with the second output amplifier (U2), the negative input of this second output amplifier (U2) is connected with reference voltage, the positive input of this second output amplifier (U2) connects the output terminal of described peak detection circuit (13), this second output amplifier (U2) output terminal is connected with the base stage of second triode (Q2), the collector of this second triode (Q2) is connected the grounded emitter of second triode (Q2) with the output terminal of described first output circuit (14) or the emitter of first triode (Q1).
15. transformer type noncontact angular transducer according to claim 14 is characterized in that: emitter string the 4th resistance (R4) the back ground connection of second triode (Q2).
16. according to described second output circuit of claim 14 (15), it is characterized in that: the emitter crosstalk resistance (R100) of described second triode (Q2) is connected with the negative input of the described second output amplifier (U2).
17. according to described second output circuit of claim 14 (15), it is characterized in that: the resistance of described the 4th resistance (R4) is less than or equal to the 3rd resistance (R3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202940798U CN201569409U (en) | 2009-12-23 | 2009-12-23 | Transformer-type non-contact angle sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202940798U CN201569409U (en) | 2009-12-23 | 2009-12-23 | Transformer-type non-contact angle sensor |
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| CN201569409U true CN201569409U (en) | 2010-09-01 |
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| CN2009202940798U Expired - Fee Related CN201569409U (en) | 2009-12-23 | 2009-12-23 | Transformer-type non-contact angle sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607604A (en) * | 2012-03-15 | 2012-07-25 | 李建国 | Phase-sensitive detection circuit |
| CN107328979A (en) * | 2017-06-22 | 2017-11-07 | 山东航天电子技术研究所 | A kind of simplex winding Toroidal current sensor |
-
2009
- 2009-12-23 CN CN2009202940798U patent/CN201569409U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607604A (en) * | 2012-03-15 | 2012-07-25 | 李建国 | Phase-sensitive detection circuit |
| CN107328979A (en) * | 2017-06-22 | 2017-11-07 | 山东航天电子技术研究所 | A kind of simplex winding Toroidal current sensor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100901 Termination date: 20121223 |