CN105703729A - Charge amplifier, and method of converting charge signal into voltage signal - Google Patents
Charge amplifier, and method of converting charge signal into voltage signal Download PDFInfo
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- CN105703729A CN105703729A CN201610020548.1A CN201610020548A CN105703729A CN 105703729 A CN105703729 A CN 105703729A CN 201610020548 A CN201610020548 A CN 201610020548A CN 105703729 A CN105703729 A CN 105703729A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/70—Charge amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/303—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device
- H03F1/304—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device and using digital means
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Abstract
The application discloses a charge amplifier, and a method of converting charge signals into voltage signals; the charge amplifier comprises the following structures: a charge amplification circuit used for receiving an input charge signal and converting the charge signal into a voltage signal, and outputting the voltage signal; a feedback resistor; an electronic switch connected in series with the feedback resistor, and the formed series branch is connected in parallel between the input end and output end Out of the charge amplification circuit; an output voltage detection circuit coupled to the output end Out of the charge amplification circuit and used for detecting average voltage of the voltage signals outputted by the charge amplification circuit, and outputting a control signal according to the average voltage; a switch control circuit coupled to the output voltage detection circuit and used for receiving the control signal, and thus controlling switch-on/switch-off of the electronic switch according to the control signal. The charge amplifier can effectively solve the clipping distortion problems caused by transient temperature.
Description
Technical field
The present invention relates to circuit engineering, in particular to a kind of charge amplifier and charge signal is converted to voltage signal method。
Background technology
In aero-engine or other internal combustion power mechanisms, it is required for measuring vibration。At present in high temperature environments, the many employings of sensor for measuring vibration have the piezoelectric effect type sensor of advantageous characteristic。The output of such sensor is generally charge signal, therefore it is generally preferred that scheme also needs to adapted charge amplifier, and charge signal is converted to voltage signal。For piezoelectric vibration sensors, after charge signal is converted to voltage signal by the charge amplifier of institute's adapted, easily the voltage signal of output can be amplified, filtered, calculus computing etc. processes, and also can be further conveyed in digital high-speed acquisition system by voltage signal。Its advantage is frequency response range width, long service life and can be used in relatively rugged environment。
But during existing charge amplifier adapted piezoelectric effect type sensor, when sensor temperature sharply changes, often it is subject to the impact of transient temperature respond, causes that charge amplifier slicing even produces saturation distortion, have a strong impact on the accuracy of test data。For piezoelectric vibration sensors, its transient temperature coefficient can reach about 10g/ DEG C。In engine startup or acceleration and deceleration process, the temperature of sensor mounting location sharply changes, up to tens DEG C, even hundreds of DEG C, the vibration output charge amount being equivalent to hundreds of to several thousand g will necessarily be produced, its measurement scope set much larger than charge amplifier, thus causing the clipping distortion of charge amplifier saturated even up to the degree of depth。
Summary of the invention
The present invention provides a kind of charge amplifier and the method that charge signal is converted to voltage signal, it is possible to effectively solve the clipping distortion problem of the charge amplifier produced because of transient temperature。
Other characteristics of the present invention and advantage will be apparent from by detailed description below, or partially by the practice of the present invention and acquistion。
According to an aspect of the present invention, provide a kind of charge amplifier, including: charge amplifying circuit, the input of described charge amplifying circuit receives the charge signal of input, and the outfan Out of described charge amplifying circuit exports the voltage signal converted via described charge signal；Feedback resistance；Electrical switch, connects with described feedback resistance, and the series arm formed is parallel between the input of described charge amplifying circuit and outfan Out；Output voltage detecting circuit, is coupled to the outfan Out of described charge amplifying circuit, for detecting the average voltage of the described voltage signal of described charge amplifying circuit output, and exports control signal according to described average voltage；And ON-OFF control circuit, it is coupled to described output voltage detecting circuit, is used for receiving described control signal, and controls conducting and the disconnection of described electrical switch according to described control signal。
According to an embodiment of the present invention, described output voltage detecting circuit includes: average voltage testing circuit, couples with the outfan of described charge amplifying circuit, is used for detecting and export described average voltage；Reverse amplification circuit, couples with described average voltage testing circuit, for providing the backward voltage of described average voltage；First sluggish reversely comparison circuit, couples with described average voltage testing circuit and described ON-OFF control circuit, for judge described average voltage negative bias from size；When described average voltage is less than negative first threshold, send described control signal to described ON-OFF control circuit, so that described ON-OFF control circuit controls the conducting of described electrical switch；When described average voltage is less than 0 and more than negative Second Threshold, send described control signal to described ON-OFF control circuit, so that described ON-OFF control circuit controls the disconnection of described electrical switch；And the second sluggish reversely comparison circuit, couple with described reverse amplification circuit and described ON-OFF control circuit, for judging the size of described average voltage positive deviation；When described average voltage is more than positive described first threshold, send described control signal to described ON-OFF control circuit, so that described ON-OFF control circuit controls the conducting of described electrical switch；When described average voltage is more than 0 and less than negative described Second Threshold, send described control signal to described ON-OFF control circuit, so that described ON-OFF control circuit controls the disconnection of described electrical switch。
According to an embodiment of the present invention, described average voltage testing circuit includes: the 5th resistance, the 3rd electric capacity and four-operational amplifier；Wherein said first end of the 5th resistance and the outfan of described charge amplifying circuit couple, and the positive input terminal of its second end and described four-operational amplifier couples；First end of described 3rd electric capacity is coupled to the positive input terminal of described four-operational amplifier, its second end ground connection；The negative input end of described four-operational amplifier is coupled to described reverse amplification circuit, the outfan of the 4th operational amplification circuit be coupled to the described first sluggish reversely comparison circuit。
According to an embodiment of the present invention, described reverse amplification circuit includes: the 6th resistance, the 7th resistance and the 5th operational amplifier；First end of wherein said 6th resistance is coupled to the negative input end of described four-operational amplifier, and its second end is coupled to the negative input end of described 5th operational amplifier；Described 7th resistor coupled in parallel is between the negative input end and the outfan of described 5th operational amplifier of described 5th operational amplifier；The positive input terminal ground connection of described 5th operational amplifier, the outfan of described 5th operational amplifier is coupled to the described second sluggish reversely comparison circuit。
According to an embodiment of the present invention, the described first sluggish reversely comparison circuit includes: the second operational amplifier, the 8th resistance, the 9th resistance, the tenth resistance and the 11st resistance；Wherein said 8th resistor coupled in parallel is between the positive input terminal and the outfan of described second operational amplifier of described second operational amplifier；First end of described 9th resistance is coupled to the positive input terminal of described second operational amplifier, and the first end of its second end and described tenth resistance couples；Second end of described tenth resistance is coupled to negative power end；First end of described 11st resistance is coupled to the first end of described tenth resistance, its second end ground connection；The negative input end of described second operational amplifier is coupled to the outfan of described four-operational amplifier, and its outfan is coupled to described ON-OFF control circuit。
According to an embodiment of the present invention, the described second sluggish reversely comparison circuit includes: the 3rd operational amplifier, the 12nd resistance, the 13rd resistance, the 14th resistance and the 15th resistance；Wherein said 12nd resistor coupled in parallel is between positive input terminal and the outfan of described 3rd operational amplifier；First end of described 13rd resistance is coupled to the positive input terminal of described 3rd operational amplifier, and its second end is coupled to the first end of described 14th resistance；Second end of described 14th resistance is coupled to negative power end；First end of described 15th resistance is coupled to the first end of described 14th resistance, its second end ground connection；The negative input end of described 3rd operational amplifier is coupled to the outfan of described 5th operational amplifier, and its outfan is coupled to described ON-OFF control circuit。
According to an embodiment of the present invention, described ON-OFF control circuit includes: the first diode, the second diode and the 16th resistance；First end of wherein said 16th resistance is coupled to negative power end, and its second end is coupled to described electrical switch；The positive pole of described first diode is coupled to the outfan of described second operational amplifier, and its negative pole is coupled to described electrical switch；The positive pole of described second diode is coupled to described 3rd operational amplifier, and its negative pole is coupled to described electrical switch。
According to an embodiment of the present invention, described charge amplifying circuit includes the first operational amplifier, and the series arm of described feedback resistance and described electrical switch is parallel between negative input end and the outfan of described first operational amplifier。
According to a further aspect in the invention, provide a kind of method that charge signal is converted to voltage signal, it is applied in a charge amplifier, described charge amplifier includes: charge amplifying circuit, feedback resistance pole electrical switch, the series arm that wherein said feedback resistance and described electrical switch form is parallel between input and the outfan of described charge amplifying circuit；Described method includes: receive the voltage signal of described charge amplifying circuit output；Detect the average voltage of described voltage signal, and according to described average voltage, export control signal；And, according to described control signal, control being turned on or off of described electrical switch。
According to an embodiment of the present invention, according to described average voltage, output control signal includes: when detecting that described average voltage is more than positive first threshold or less than negative first threshold, output controls the control signal of described electrical switch conducting；When detecting that described average voltage is less than positive Second Threshold and more than negative Second Threshold, output controls the control signal that described electrical switch disconnects。
Charge amplifier according to the present invention has enough dynamic ranges, when adapted piezoelectric effect sensor, it is possible to automatically adapt to the transition output of sensor, make output voltage stabilization at about 0V, it is to avoid clipping distortion。Additionally, the clipping distortion problem that this charge amplifier causes because solving transient response, it is possible to decrease the requirement of the transient temperature characteristic of front end sensors, applied widely, there is good application value。
It should be appreciated that above general description and details hereinafter describe and be merely illustrative of, the present invention can not be limited。
Accompanying drawing explanation
Its example embodiment being described in detail by referring to accompanying drawing, above-mentioned and other target of the present invention, feature and advantage will become apparent from。
Fig. 1 is the block diagram of a kind of charge amplifier according to an illustrative embodiments。
Fig. 2 A is the oscillogram of the normal output voltage signal Vo according to an example。
Fig. 2 B is the charge amplifying circuit 102 according to example when receiving transient response charge signal, the clipping distortion oscillogram of the voltage signal Vo of generation。
Fig. 3 A is the characteristic curve of the conventional charge amplifier according to an example。
Fig. 3 B is the characteristic curve of the charge amplifier of the embodiment of the present invention according to an example。
Fig. 4 is the block diagram of the another kind of charge amplifier according to an illustrative embodiments。
Fig. 5 is the circuit diagram of the charge amplifier shown in the Fig. 4 according to an illustrative embodiments。
Fig. 6 A-Fig. 6 E is the graph of a relation in circuit shown in the Fig. 5 being shown respectively according to an example between each output voltage。
Fig. 7 is the flow chart of a kind of method that charge signal is converted to voltage signal according to an illustrative embodiments。
Detailed description of the invention
It is described more fully with example embodiment referring now to accompanying drawing。But, example embodiment can be implemented in a variety of forms, and is not understood as limited to example set forth herein；On the contrary, it is provided that these embodiments make the present invention will more fully and completely, and the design of example embodiment is conveyed to those skilled in the art all sidedly。Accompanying drawing is only the schematic illustrations of the present invention, is not necessarily drawn to scale。Accompanying drawing labelling identical in figure represents same or similar part, thus will omit repetition thereof。
Additionally, described feature, structure or characteristic can be combined in one or more embodiment in any suitable manner。In the following description, it is provided that many details are thus providing fully understanding embodiments of the present invention。It will be appreciated, however, by one skilled in the art that can put into practice technical scheme and omit in described specific detail is one or more, or other method, constituent element, device, step etc. can be adopted。In other cases, known features, method, device, realization or operation are not shown in detail or describe to avoid that a presumptuous guest usurps the role of the host and to make each aspect of the present invention thicken。
Fig. 1 is the block diagram of a kind of charge amplifier according to an illustrative embodiments。As it is shown in figure 1, charge amplifier 10 includes: charge amplifying circuit 102, output voltage detecting circuit 104, feedback resistance 106, electrical switch K1 and ON-OFF control circuit 108。
Wherein, the input In of charge amplifying circuit 102 receives the charge signal Ci of input, and after being converted into voltage signal Vo, by its outfan Out output voltage signal Vo。
Fig. 2 A illustrates the oscillogram of normal output voltage signal Vo。And when the charge signal Ci that charge amplifying circuit 102 receives is transient response charge signal, the meansigma methods of the voltage signal Vo of its output can deviate 0V, and is directly proportional to transient response charge signal。Normal output voltage signal Vo is superimposed upon on this average voltage, and when deviateing greatly to a certain extent, normal voltage signal Vo can produce clipping distortion。Fig. 2 B illustrates when charge amplifying circuit 102 receives transient response charge signal, the clipping distortion oscillogram of the voltage signal Vo of generation, and charge amplifying circuit 102 even can be made time more serious fully saturated。
Output voltage detecting circuit 104 couples the outfan Out of charge amplifying circuit 102, for detecting the size of the average voltage of the voltage signal Vo of charge amplifying circuit 102 output；And the size of the average voltage according to the voltage signal Vo detected, export control signal to ON-OFF control circuit 108。
ON-OFF control circuit 108 and output voltage detecting circuit 104 couple, the control signal according to output voltage detecting circuit 104 output, control conducting and the disconnection of electrical switch K1。
Such as, when average voltage voltage signal Vo being detected deviates positive and negative first threshold ± T1, output voltage detecting circuit 104 exports high level to ON-OFF control circuit 108, and ON-OFF control circuit 108 controls the conducting of electrical switch K1；When average voltage voltage signal Vo being detected deviates and returns within positive and negative Second Threshold ± T2, output voltage detecting circuit 104 is to ON-OFF control circuit 108 output low level, and ON-OFF control circuit 108 controls the disconnection of electrical switch K1。Vice versa, as output voltage detecting circuit 104 exports high level, to control the disconnection of electrical switch K1；Output voltage detecting circuit 104 output low level, to control the conducting of electrical switch K1。Wherein first threshold T1 and Second Threshold T2 is when practical application, it is possible to arrange according to demand and specifically, for instance first threshold T1 could be arranged to 1.3V, and Second Threshold T2 could be arranged to 0.7V。The present invention is not limited。
Electrical switch K1 connects with feedback resistance 106, and the series arm formed is parallel between the input In of charge amplifying circuit 102 and outfan Out。When electrical switch K1 turns on, the resistance value of the direct current negative feedback resistor of charge amplifying circuit 102 is changed by feedback resistance 106, thus accelerating the release of transient response electric charge, charge amplifying circuit 102 is made to be promptly restored to normality, it is ensured that the dynamic range that charge amplifying circuit 102 is enough。
Fig. 3 A illustrates that the characteristic curve of conventional charge amplifier, Fig. 3 B illustrate the characteristic curve of the charge amplifier 10 of the present invention。By in Fig. 3 A and Fig. 3 B it can be seen that the charge amplifier 10 of the present invention can automatic circuit when receiving transient response electric charge and produce obvious transition output so that it is characteristic curve has been become heavy line L2 from the fine line L1 in Fig. 3 B。Can be seen that by Fig. 3 B the charge amplifier 10 of the present invention has enough dynamic ranges, thus when adapted piezoelectric effect sensor, automatically adapt to the transition output of sensor, output voltage stabilization can be made at about 0V, it is to avoid clipping distortion。
The clipping distortion problem that the charge amplifier 10 of present embodiment causes because solving transient response, it is possible to decrease the requirement of the transient temperature characteristic of front end sensors, applied widely, there is good application value。
It will be clearly understood that present disclosure describe how to be formed and use particular example, but principles of the invention is not limited to any details of these examples。On the contrary, based on the instruction of present disclosure, these principles can be applied to numerous other embodiments。
Fig. 4 is the block diagram of the another kind of charge amplifier according to an illustrative embodiments。As shown in Figure 4, being distinguished by of charge amplifier 20 and the charge amplifier 10 shown in Fig. 1: output voltage detecting circuit 204 farther includes: the sluggish reversely comparison circuit of average voltage testing circuit 2042, reverse amplification circuit 2044, first 2046 and the second sluggish reversely comparison circuit 2048。
Wherein average voltage testing circuit 2042 and charge amplifying circuit 102 couple, for detecting the average voltage of the also voltage signal Vo of output charge amplifying circuit 102 output。
Sign-changing amplifier 2044 and average voltage testing circuit 2042 couple, for providing the reverse average voltage of the voltage signal Vo of output。
First sluggish reversely comparison circuit 2046 and average voltage testing circuit 2042 couples, for judge the average voltage negative bias of voltage signal Vo from size。When the average voltage of voltage signal Vo is less than negative first threshold-T1, send control signal to ON-OFF control circuit 108, to control the conducting of electrical switch K1；When the average voltage of voltage signal Vo is less than 0 and more than negative Second Threshold-T2, send control signal to ON-OFF control circuit 108, to control the disconnection of electrical switch K1。
Second sluggish reversely comparison circuit 2048 and sign-changing amplifier 2044 couples, for judging the size of the average voltage positive deviation of voltage signal Vo。When the average voltage of voltage signal Vo is more than positive first threshold+T1, send control signal to ON-OFF control circuit 108, to control the conducting of electrical switch K1；When the average voltage of voltage signal Vo is more than 0 and less than positive Second Threshold+T2, send control signal to ON-OFF control circuit 108, to control the disconnection of electrical switch K1。
Charge amplifier 20 does not repeat them here with the content of same section in charge amplifier 10。
It should be noted that the block diagram shown in above-mentioned accompanying drawing is functional entity, it is not necessary to must be corresponding with physically or logically independent entity。One or more component or circuit module can be adopted to realize these functional entitys。
Fig. 5 is the circuit diagram of the charge amplifier 20 shown in the Fig. 4 according to an illustrative embodiments。As it is shown in figure 5, charge amplifier 20 includes: charge amplifying circuit 102, output voltage detecting circuit 204, feedback resistance 106, electrical switch K1 and ON-OFF control circuit 108。
It should be noted that for simplified electrical circuit diagram, the power supply circuits of not shown each operational amplifier in Fig. 5。In the present embodiment, the power supply mode of each operational amplifier illustrates for dual power supply, for instance employing ± 12V dual power supply, but the invention is not restricted to this。
Wherein, charge amplifying circuit 102 includes: first operational amplifier A the 1, first electric capacity C0, the second electric capacity C1, the first resistance R0, the second resistance R1 and the 3rd resistance R21。
First termination of the second resistance R1 receives the charge signal Ci of input, and its second end is coupled to the first end of the parallel branch of the first resistance R0 and the first electric capacity C0 composition。Second end of this parallel branch be coupled to the first operational amplifier A 1 negative input end (-)。The positive input terminal of the first operational amplifier A 1 (+) ground connection, its outfan Out output voltage signal Vo。3rd resistance R21 be parallel to the first operational amplifier negative input end (-) and outfan Out between。Second electric capacity C0 is parallel between second end of the second resistance R1 and the outfan Out of the first operational amplifier A 1。
In certain embodiments, the capacitance of the first electric capacity C0 can be such as 0.22 μ F, the capacitance of the second electric capacity C1 can be such as 10nF, the resistance value of the first resistance R0 can be such as 20M Ω, the resistance value of the second resistance R1 can be such as 27 Ω, and the resistance value of the 3rd resistance R21 can be such as 5.1M Ω。
Charge amplifying circuit 102 is when electrical switch K1 disconnects, and its frequency characteristic is consistent with conventional charge amplifier, namely in Fig. 3 B shown in fine line L1。
Feedback resistance 106 includes: the 4th resistance R22。When transition output voltage is bigger, electrical switch K1 turns on, 4th resistance R22 and the three resistance R21 is in parallel, the DC feedback of the first operational amplifier A 1 is strengthened, such as when the resistance value of the 3rd resistance R21 is 5.1M Ω, when the resistance value of the 4th resistance R22 is 51.0k Ω, DC feedback can strengthen as original 10 times, thus the transition electric charge that realizes releasing rapidly。Meanwhile, in Fig. 3 B shown in heavy line L2, the AC signal of useful more than tens hertz will not be produced impact by it。
Output voltage detecting circuit 204 includes: the sluggish reversely comparison circuit of average voltage testing circuit 2042, reverse amplification circuit 2044, first 2046 and the second sluggish reversely comparison circuit 2048。
Wherein, average voltage testing circuit 2042 includes: the 5th resistance R23, the 3rd electric capacity C2 and four-operational amplifier A4。
5th resistance R23, the 3rd electric capacity C2 and four-operational amplifier A4 constitute a RC testing circuit。First end of the 5th resistance R2 and the outfan Out of the first operational amplifier A 1 couple, its second end be coupled to four-operational amplifier positive input terminal (+)。First end of the 3rd electric capacity C2 be coupled to four-operational amplifier positive input terminal (+), its second end ground connection。The average voltage V1 of the output voltage signal Vo of the 3rd real-time output charge amplifying circuit 102 of electric capacity C2。
Average voltage V1 is equal to the voltage V2 of four-operational amplifier outfan Out output, and its relation is as shown in Figure 6A。
In certain embodiments, the resistance value of the 5th resistance R23 can be such as 20k Ω, and the capacitance of the 3rd electric capacity C2 can be such as 2.2 μ F, and its averaging time constant is such as about 0.3 second。
Reverse amplification circuit 2044 includes: the 5th operational amplifier A the 5, the 6th resistance R30 and the 7th resistance R39。
First end of the 6th resistance R30 couple four-operational amplifier A4 negative input end (-), its second end be coupled to the 5th operational amplifier A 5 negative input end (-)。The positive input terminal of the 5th operational amplifier (+) ground connection, its outfan Out output voltage V3。7th resistance R39 be parallel to the 5th operational amplifier negative input end (-) and the outfan Out of the 5th operational amplifier A 5 between。
Relation between the output voltage V3 of average voltage V1 and the five operational amplifier A 5 that the 3rd electric capacity C2 detects as shown in Figure 6B, V1=-V3。
In certain embodiments, the resistance value of the 6th resistance R30 can be such as 11k Ω, and the resistance value of the 7th resistance R39 can be such as 11k Ω。
First sluggish reversely comparison circuit 2046 includes: the second operational amplifier A the 2, the 8th resistance R31, the 9th resistance R32, the tenth resistance R33 and the 11st resistance R34。
The negative input end of the second operational amplifier A 2 (-) it is coupled to the outfan Out, its outfan Out output voltage V4 of four-operational amplifier A4。8th resistance R31 be parallel to the second operational amplifier A 2 positive input terminal (+) and outfan Out between。The positive input terminal of first end of the 9th resistance R32 and the second operational amplifier A 2 (+) couple, first end of its second end and the tenth resistance R33 couples。Second end of the tenth resistance R33 couples the negative power end (-E) in dual power supply。First end of the 11st resistance R34 is coupled to first end of the tenth resistance R33, its second end ground connection。
Average voltage V1 that 3rd electric capacity C2 detects and the relation of the output voltage V4 of the second operational amplifier A 2 are as shown in Figure 6 C。The design of sluggish reversely comparison circuit 2046 is possible to prevent the problem at threshold value frequent movement, and prevents from charge amplifier 20 is introduced interference, thus judge the 3rd electric capacity C2 average voltage V1 negative bias detected from size。When average voltage V1 is less than negative first threshold-T1, send control signal to ON-OFF control circuit 108, to control the conducting of electrical switch K1；When average voltage V1 is less than 0 and more than negative Second Threshold-T2, send control signal to ON-OFF control circuit 108, to control the disconnection of electrical switch K1。
In certain embodiments, the resistance value of the 8th resistance R31 can be such as 200k Ω, and the resistance value of the 9th resistance R32 can be such as 5.1k Ω, and the resistance value of the tenth resistance R33 can be such as the resistance value of 11k Ω and the 11st resistance R34 can be such as 1k Ω。Hysteresis voltage is about 0.6V。
Second sluggish reversely comparison circuit 2048 includes: the 3rd operational amplifier A the 3, the 12nd resistance R35, the 13rd resistance R36, the 14th resistance R37 and the 15th resistance R38。
The negative input end of the 3rd operational amplifier A 3 (-) it is coupled to the outfan Out, its outfan Out output voltage V5 of the 5th operational amplifier A 5。12nd resistance R35 be parallel to the 3rd operational amplifier A 3 positive input terminal (+) and outfan Out between。The positive input terminal of first end of the 13rd resistance R36 and the 3rd operational amplifier A 3 (+) couple, first end of its second end and the 14th resistance R37 couples。Second end of the 14th resistance R37 couples the negative power end (-E) in dual power supply。First end of the 15th resistance R38 is coupled to first end of the 14th resistance R37, its second end ground connection。
The relation of the output voltage V5 of average voltage V1 and the three operational amplifier A 3 that the 3rd electric capacity C2 detects is as shown in Figure 6 D。The design of sluggish reversely comparison circuit 2048 is possible to prevent the problem at threshold value frequent movement, and prevents from charge amplifier 20 is introduced interference, thus judging the size of the 3rd electric capacity C2 average voltage V1 positive deviation detected。When the average voltage of voltage signal Vo is more than positive first threshold+T1, send control signal to ON-OFF control circuit 108, to control the conducting of electrical switch K1；When the average voltage of voltage signal Vo is more than 0 and less than positive Second Threshold+T2, send control signal to ON-OFF control circuit 108, to control the disconnection of electrical switch K1。
In certain embodiments, the resistance value of the 12nd resistance R35 can be such as 200k Ω, the resistance value of the 13rd resistance R36 can be such as 5.1k Ω, and the resistance value of the 14th resistance R37 can be such as the resistance value of 11k Ω and the 15th resistance R38 can be such as 1k Ω。Hysteresis voltage is about 0.6V。
ON-OFF control circuit 108 includes: the first diode D1, the second diode D2 and the 16th resistance R3。
First diode D1, the second diode D2 and the 16th resistance R3 form the OR circuit of the output voltage V5 input of output voltage V4 and the three operational amplifier of the second operational amplifier V2。First end of the 16th resistance R3 couples the negative power end (-E) in dual power supply, and its second end is coupled to electrical switch K1。The positive pole of the first diode D1 and the outfan Out of the second operational amplifier A 2 couple, and its negative pole couples electrical switch K1, control being turned on or off of electrical switch K1 by the voltage signal V6 exported。The positive pole of the second diode D2 and the outfan Out of the 3rd operational amplifier A 3 couple, and its negative pole couples electrical switch K1。Such as illustrated in fig. 6e, high voltage controls the conducting of electrical switch K1 to the relation of voltage signal V6 and average voltage V1, and low-voltage controls the disconnection of K1。
In certain embodiments, the resistance value of the 16th resistance R3 can be such as 5.1k Ω。
Fig. 7 is the flow chart of a kind of method that charge signal is converted to voltage signal according to an illustrative embodiments。The method 30 can apply in a charge amplifier, and this charge amplifier includes charge amplifying circuit 102 as illustrated in figure 1 or 4, feedback resistance 106 and electrical switch K1。Associating is with reference to Fig. 7 and Fig. 1 or Fig. 4, and the method 30 includes:
In step s 302, the voltage signal Vo of charge amplifying circuit 102 output is received。
Wherein voltage signal Vo is converted by the charge signal Ci being input in charge amplifying circuit 102。
In step s 304, the size of the average voltage of detectable voltage signals Vo, and the size according to this average voltage, export control signal。
In certain embodiments, when average voltage voltage signal Vo being detected deviates positive and negative first threshold ± T1, control signal is exported, to control the conducting of electrical switch K1；When average voltage voltage signal Vo being detected deviates and returns within positive and negative Second Threshold ± T2, export control signal, to control the disconnection of electrical switch K1。Wherein first threshold T1 and Second Threshold T2 is when practical application, it is possible to arrange according to demand and specifically, for instance first threshold T1 could be arranged to 1.3V, and Second Threshold T2 could be arranged to 0.7V。The present invention is not limited。
In step S306, according to control signal, control being turned on or off of electrical switch K1。
The method 30 of present embodiment can solve the clipping distortion problem of the charge amplifier that transient response causes, thus the requirement of the transient temperature characteristic of charge amplifier front end sensors can be reduced, applied widely, has good application value。
Further, it should be noted that above-mentioned accompanying drawing is only schematically illustrating of the process included by the method for exemplary embodiment of the invention, rather than restriction purpose。It can be readily appreciated that above-mentioned process shown in the drawings is not intended that or limits the time sequencing of these process。It addition, be also easy to understand, these process can such as either synchronously or asynchronously perform in multiple modules。
More than it is particularly shown and described the illustrative embodiments of the present invention。It should be appreciated that the invention is not restricted to detailed construction described herein, set-up mode or realize method；On the contrary, it is intended to various amendments and equivalence in containing the spirit and scope being included in claims are arranged。
Claims (10)
1. a charge amplifier, it is characterised in that including:
Charge amplifying circuit, the input of described charge amplifying circuit receives the charge signal of input, and the outfan Out of described charge amplifying circuit exports the voltage signal converted via described charge signal；
Feedback resistance；
Electrical switch, connects with described feedback resistance, and the series arm formed is parallel between the input of described charge amplifying circuit and outfan Out；
Output voltage detecting circuit, is coupled to the outfan Out of described charge amplifying circuit, for detecting the average voltage of the described voltage signal of described charge amplifying circuit output, and exports control signal according to described average voltage；And
ON-OFF control circuit, is coupled to described output voltage detecting circuit, is used for receiving described control signal, and controls conducting and the disconnection of described electrical switch according to described control signal。
2. charge amplifier according to claim 1, it is characterised in that described output voltage detecting circuit includes:
Average voltage testing circuit, couples with the outfan of described charge amplifying circuit, is used for detecting and export described average voltage；
Reverse amplification circuit, couples with described average voltage testing circuit, for providing the backward voltage of described average voltage；
First sluggish reversely comparison circuit, couples with described average voltage testing circuit and described ON-OFF control circuit, for judge described average voltage negative bias from size；When described average voltage is less than negative first threshold, send described control signal to described ON-OFF control circuit, so that described ON-OFF control circuit controls the conducting of described electrical switch；When described average voltage is less than 0 and more than negative Second Threshold, send described control signal to described ON-OFF control circuit, so that described ON-OFF control circuit controls the disconnection of described electrical switch；And
Second sluggish reversely comparison circuit, couples with described reverse amplification circuit and described ON-OFF control circuit, for judging the size of described average voltage positive deviation；When described average voltage is more than positive described first threshold, send described control signal to described ON-OFF control circuit, so that described ON-OFF control circuit controls the conducting of described electrical switch；When described average voltage is more than 0 and less than negative described Second Threshold, send described control signal to described ON-OFF control circuit, so that described ON-OFF control circuit controls the disconnection of described electrical switch。
3. charge amplifier according to claim 2, it is characterised in that described average voltage testing circuit includes: the 5th resistance, the 3rd electric capacity and four-operational amplifier；Wherein said first end of the 5th resistance and the outfan of described charge amplifying circuit couple, and the positive input terminal of its second end and described four-operational amplifier couples；First end of described 3rd electric capacity is coupled to the positive input terminal of described four-operational amplifier, its second end ground connection；The negative input end of described four-operational amplifier is coupled to described reverse amplification circuit, the outfan of the 4th operational amplification circuit be coupled to the described first sluggish reversely comparison circuit。
4. charge amplifier according to claim 3, it is characterised in that described reverse amplification circuit includes: the 6th resistance, the 7th resistance and the 5th operational amplifier；First end of wherein said 6th resistance is coupled to the negative input end of described four-operational amplifier, and its second end is coupled to the negative input end of described 5th operational amplifier；Described 7th resistor coupled in parallel is between the negative input end and the outfan of described 5th operational amplifier of described 5th operational amplifier；The positive input terminal ground connection of described 5th operational amplifier, the outfan of described 5th operational amplifier is coupled to the described second sluggish reversely comparison circuit。
5. charge amplifier according to claim 4, it is characterised in that the described first sluggish reversely comparison circuit includes: the second operational amplifier, the 8th resistance, the 9th resistance, the tenth resistance and the 11st resistance；Wherein said 8th resistor coupled in parallel is between the positive input terminal and the outfan of described second operational amplifier of described second operational amplifier；First end of described 9th resistance is coupled to the positive input terminal of described second operational amplifier, and the first end of its second end and described tenth resistance couples；Second end of described tenth resistance is coupled to negative power end；First end of described 11st resistance is coupled to the first end of described tenth resistance, its second end ground connection；The negative input end of described second operational amplifier is coupled to the outfan of described four-operational amplifier, and its outfan is coupled to described ON-OFF control circuit。
6. charge amplifier according to claim 5, it is characterised in that the described second sluggish reversely comparison circuit includes: the 3rd operational amplifier, the 12nd resistance, the 13rd resistance, the 14th resistance and the 15th resistance；Wherein said 12nd resistor coupled in parallel is between positive input terminal and the outfan of described 3rd operational amplifier；First end of described 13rd resistance is coupled to the positive input terminal of described 3rd operational amplifier, and its second end is coupled to the first end of described 14th resistance；Second end of described 14th resistance is coupled to negative power end；First end of described 15th resistance is coupled to the first end of described 14th resistance, its second end ground connection；The negative input end of described 3rd operational amplifier is coupled to the outfan of described 5th operational amplifier, and its outfan is coupled to described ON-OFF control circuit。
7. charge amplifier according to claim 6, it is characterised in that described ON-OFF control circuit includes: the first diode, the second diode and the 16th resistance；First end of wherein said 16th resistance is coupled to negative power end, and its second end is coupled to described electrical switch；The positive pole of described first diode is coupled to the outfan of described second operational amplifier, and its negative pole is coupled to described electrical switch；The positive pole of described second diode is coupled to described 3rd operational amplifier, and its negative pole is coupled to described electrical switch。
8. the charge amplifier according to any one of claim 1-7, it is characterized in that, described charge amplifying circuit includes the first operational amplifier, and the series arm of described feedback resistance and described electrical switch is parallel between negative input end and the outfan of described first operational amplifier。
9. the method that charge signal is converted to voltage signal, it is applied in a charge amplifier, it is characterized in that, described charge amplifier includes: charge amplifying circuit, feedback resistance pole electrical switch, the series arm that wherein said feedback resistance and described electrical switch form is parallel between input and the outfan of described charge amplifying circuit；Described method includes:
Receive the voltage signal of described charge amplifying circuit output；
Detect the average voltage of described voltage signal, and according to described average voltage, export control signal；And,
According to described control signal, control being turned on or off of described electrical switch。
10. method according to claim 9, it is characterized in that, according to described average voltage, output control signal includes: when detecting that described average voltage is more than positive first threshold or less than negative first threshold, output controls the control signal of described electrical switch conducting；When detecting that described average voltage is less than positive Second Threshold and more than negative Second Threshold, output controls the control signal that described electrical switch disconnects。
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| CN201610020548.1A CN105703729B (en) | 2016-01-13 | 2016-01-13 | Charge amplifier and the method that charge signal is converted to voltage signal |
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| CN201610020548.1A CN105703729B (en) | 2016-01-13 | 2016-01-13 | Charge amplifier and the method that charge signal is converted to voltage signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024124555A1 (en) * | 2022-12-16 | 2024-06-20 | 京东方科技集团股份有限公司 | Haptic feedback signal detection circuit, driving control circuit, and haptic feedback apparatus |
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| US4962328A (en) * | 1988-01-25 | 1990-10-09 | AVL Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik mbH., Prof.Dr.Dr.h.c. Hans List | Charge amplifier circuit with drift compensation |
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| WO2024124555A1 (en) * | 2022-12-16 | 2024-06-20 | 京东方科技集团股份有限公司 | Haptic feedback signal detection circuit, driving control circuit, and haptic feedback apparatus |
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| CN105703729B (en) | 2018-04-17 |
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