CN201637425U - Transformer type sensor circuit - Google Patents
Transformer type sensor circuit Download PDFInfo
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- CN201637425U CN201637425U CN200920293917XU CN200920293917U CN201637425U CN 201637425 U CN201637425 U CN 201637425U CN 200920293917X U CN200920293917X U CN 200920293917XU CN 200920293917 U CN200920293917 U CN 200920293917U CN 201637425 U CN201637425 U CN 201637425U
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Abstract
The utility model discloses a transformer type sensor circuit which is provided with an oscillation driving circuit; the output end of the oscillation driving circuit is connected on a primary coil of a transformer sensor; and a secondary coil of the transformer sensor is connected on a processing circuit, of which the output end is connected with a first output circuit. The transformer type sensor circuit is characterized in that the processing circuit is a peak value detecting circuit. The transformer type sensor circuit has the obvious effects of being capable of reducing coil turns of the transformer, and leading the sensor to have miniaturization, low power consumption and low temperature drift. The transformer type sensor circuit not only has excellent performances, but also can lead the transformer type sensor to be manufactured more conveniently and can be applied to more conditions.
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, have increased the making and the installation cost of sensor.
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 sensor circuit, 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 sensor circuit, be provided with the concussion driving circuit, the output terminal of this concussion driving circuit is connected on the primary coil of transformation sensor, the secondary coil of this transformation sensor 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.
Peak detection circuit is different with traditional detection filter circuit, and the level of its output is higher.The output valve of peak detection circuit approaches the maximal value of input signal, and the decline with input signal does not descend.Because the maintenance electric capacity of peak detection circuit generally has discharge loop, so, this retention value still can slowly descend, the speed of this slow decline is followed the decline rate of input signal peak value much smaller than circuit, so to a series of pulse input signal, the output valve of circuit is similar to direct current signal, and its size is the peak value of input signal.
Described concussion driving circuit 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 be LC concussion pulse driving circuit, or the peak pulse driving circuit for exporting after the exchange current coupling capacitance.
Pulse-switching circuit is compared with traditional wave generator circuit, is characterised in that its electric current variation is switching effect, and waveform is precipitous.And the variation of the electric current of wave generator circuit is gradual change, and waveform is mild.The precipitous waveform that pulse switch forms can induce very high crest voltage in inductive coil, be beneficial to the work of follow-up peak detection circuit.
Peak detection circuit of the present utility model is because the speed issue of amplifier can not reach the peak value of input signal fully, but be lower than this peak value approximately.
The waveform that drives primary 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 crest voltage and actual conditions needs, 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 primary coil and secondary 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, primary coil electric current in most time is zero, if promote the instantaneous voltage amplitude of primary coil, influence to average power consumption is very little, but the induction output signal of secondary 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 secondary 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 secondary 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, ground connection behind second resistance is also gone here and there in the rear end of this second resistance, described first output circuit of the back termination of this 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 and export the signal that 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.On the collector of this first triode, then obtain current value by the control of peak detection circuit output voltage.The open collector of first triode can be manufactured the current-output type product sensor.
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.
Below be at second kind of special applicating example explanation: 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.
The resistance of described the 4th resistance is less than or equal to the 3rd resistance, is in order to make the current expansion effect obvious, to reach requirement.
By that analogy, can be provided with the 3rd, the 4th even more output circuit.
Described secondary coil is the simplex winding coil.
The resistance of described first resistance is more than or equal to second resistance.
Traditional circuit need mate with differential-type, double winding secondary coil.This circuit can mate with the simplex winding secondary coil, can reach equal performance.
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 secondary 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 sensor circuit 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.
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.
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 sensor circuit, be provided with concussion driving circuit 1, the output terminal of this concussion driving circuit 1 is connected on the primary coil 2a of transformation sensor, the secondary coil 2b of this transformation sensor is connected on the treatment circuit, the output terminal of this treatment circuit is connected with first output circuit 4, and described treatment circuit is a peak detection circuit 3.
Described concussion driving circuit 1 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 be LC concussion pulse driving circuit, or the peak pulse driving circuit for exporting after the exchange current coupling capacitance.
The waveform that drives primary 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 primary coil and secondary 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, primary coil electric current in most time is zero, if promote the instantaneous voltage amplitude of primary coil, influence to average power consumption is very little, but the induction output signal of secondary 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.
As shown in Figure 2: in order to handle the output signal of secondary coil 2b better, the utility model has further adopted peak detection circuit 3, described peak detection circuit 3 is provided with amplifier U, the positive input of this amplifier U meets described secondary coil 2b, the positive pole of output terminating diode D, the negative pole string first resistance R 1 back ground connection of this diode D, the negative pole of this diode D also connects the front end of second resistance R 2, the negative input of the described amplifier U 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 4 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.
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 3, 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 3 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.
Shown in Fig. 4,5: the waveform of the more traditional oscillating circuit of pulse waveform, the output average power under its effects equivalent has obtained effective reduction; By waveform relatively, the magnitude of voltage of pulse signal generation is higher than the magnitude of voltage of sine wave signal as can be seen, but the power that the power that pulse signal produces produces far below sine wave signal.
Also just reduce the number of turn of coil, reduced the thermal value of coil, reduced reactive loss, prolonged the serviceable life of coil.
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.
As shown in Figure 3: described first output circuit 4 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 3, 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 4 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.On the collector of this first triode Q1, then obtain current value by the control of peak detection circuit output voltage.The open collector of the first triode Q1 can be manufactured the current-output type product sensor.
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 5.
The output terminal of described peak detection circuit 3 also is connected with second output circuit 5, this second output circuit 5 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 3, 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 4 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 3.
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, 4 conductings of first output circuit, second output circuit 5 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, 5 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.
The resistance of described the 4th resistance R 4 is less than or equal to the 3rd resistance R 3, is in order to make the current expansion effect obvious, to reach requirement.
By that analogy, can be provided with the 3rd, the 4th even more output circuit.
Described secondary coil 2b is the simplex winding coil.
Traditional circuit need mate with differential-type, double winding secondary coil.This circuit can mate with the simplex winding secondary coil, can reach equal performance.
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 secondary 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.
Shown in Fig. 4,5,6: peak detection circuit is different with traditional detection filter circuit, and the level of its output is higher.The output valve of peak detection circuit approaches the maximal value of input signal, and the decline with input signal does not descend.Because the maintenance electric capacity of peak detection circuit generally has discharge loop, so, this retention value still can slowly descend, the speed of this slow decline is followed the decline rate of input signal peak value much smaller than circuit, so to a series of pulse input signal, the output valve of circuit is similar to direct current signal, and its size is the peak value of input signal.
Pulse-switching circuit is compared with traditional wave generator circuit, is characterised in that its electric current variation is switching effect, and waveform is precipitous.And the variation of the electric current of wave generator circuit is gradual change, and waveform is mild.The precipitous waveform that pulse switch forms can induce very high crest voltage in inductive coil, be beneficial to the work of follow-up peak detection circuit.
Peak detection circuit of the present utility model is because the speed issue of amplifier can not reach the peak value of input signal fully, but be lower than this peak value approximately.As shown in Figure 5, wherein 2a, 2b are respectively current waveform among primary coil 2a and the secondary coil 2b.
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, and such conversion all falls within the protection domain of the present utility model.
Claims (10)
1. transformer type sensor circuit, be provided with concussion driving circuit (1), the output terminal of this concussion driving circuit (1) is connected on the primary coil (2a) of transformation sensor, the secondary coil of this transformation sensor (2b) is connected on the treatment circuit, the output terminal of this treatment circuit is connected with first output circuit (4), it is characterized in that: described treatment circuit is peak detection circuit (3).
2. transformer type sensor circuit according to claim 1, it is characterized in that: described concussion driving circuit (1) is a pulse-switching circuit, this pulse-switching circuit is the rect.p. driving circuit that single-chip microcomputer sends, or be that RC shakes pulse driving circuit, or be LC concussion pulse driving circuit, or peak pulse driving circuit for exporting after the exchange current coupling capacitance.
3. transformer type sensor circuit according to claim 1, it is characterized in that: described peak detection circuit (3) is provided with amplifier (U), the positive input of this amplifier (U) connects described secondary 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) (4).
4. according to the described peak detection circuit of claim 3 (3), it is characterized in that: the resistance of described first resistance (R1) is more than or equal to second resistance (R2).
5. transformer type sensor circuit according to claim 1, it is characterized in that: described first output circuit (4) 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 (3), 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 (4) 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).
6. transformer type sensor circuit according to claim 1, it is characterized in that: the output terminal of described peak detection circuit (3) also is connected with second output circuit (5), this second output circuit (5) 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 (3), 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 (4) or the emitter of first triode (Q1).
7. transformer type sensor circuit according to claim 6 is characterized in that: emitter string the 4th resistance (R4) the back ground connection of second triode (Q2).
8. according to described second output circuit of claim 6 (5), 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).
9. according to described second output circuit of claim 6 (5), it is characterized in that: the resistance of described the 4th resistance (R4) is less than or equal to the 3rd resistance (R3).
10. transformer type sensor circuit according to claim 1 is characterized in that: described secondary coil (2b) is the simplex winding coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920293917XU CN201637425U (en) | 2009-12-23 | 2009-12-23 | Transformer type sensor circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920293917XU CN201637425U (en) | 2009-12-23 | 2009-12-23 | Transformer type sensor circuit |
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| Publication Number | Publication Date |
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| CN201637425U true CN201637425U (en) | 2010-11-17 |
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| CN200920293917XU Expired - Lifetime CN201637425U (en) | 2009-12-23 | 2009-12-23 | Transformer type sensor circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876527B (en) * | 2009-12-23 | 2012-10-31 | 蒋勤舟 | Transformer type sensor circuit system |
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2009
- 2009-12-23 CN CN200920293917XU patent/CN201637425U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876527B (en) * | 2009-12-23 | 2012-10-31 | 蒋勤舟 | Transformer type sensor circuit system |
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