CN203642951U - Capacitive-type sensor model circuit - Google Patents
Capacitive-type sensor model circuit Download PDFInfo
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- CN203642951U CN203642951U CN201320682682.XU CN201320682682U CN203642951U CN 203642951 U CN203642951 U CN 203642951U CN 201320682682 U CN201320682682 U CN 201320682682U CN 203642951 U CN203642951 U CN 203642951U
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Abstract
The utility model discloses a capacitive-type sensor model circuit, comprising a simulation pole plate circuit. An input end of the simulation pole plate circuit is connected with a simulation input circuit used to generate and transmit sensor packaging electrical parameter signals and sensor pole plate influencing parameter signals. An output end of the simulation pole plate circuit is connected with a simulation input circuit used to receive and output the sensor packaging electrical parameter signals and sensor pole plate influencing parameter signals. Factors which may influence detection data in a detection process of capacitive-type sensors are given sufficient consideration. The circuit is similar to the capacitive-type sensor when the capacitive-type sensor is in practical application, and provides reliable data support on research and development of the capacitive-type sensors.
Description
Technical field
The utility model relates to electrical equipment field, particularly a kind of capacitance type sensor precircuit.
Background technology
Sensor model circuit is the actual detection case in the time detecting for analog sensor.In the time that slip-stick artist carries out circuit design, can utilize sensor model circuit to substitute actual sensor, avoid slip-stick artist need to carry out the trouble of signals collecting on the spot, shorten the R&D cycle.In addition sensor model circuit can be simulated actual detection data truly, has guaranteed the accuracy of design.
Traditional differential type capacitance sensor model circuit structure is too simple, does not consider the electrical parameter producing due to electrode plate structure, material and encapsulation etc.In the time using traditional differential type capacitance type sensor precircuit design circuit, cannot reflect truly the actual detection data of capacitance type sensor.For example in closed-loop control system, easily cause distortion at some.
Summary of the invention
Problem to be solved in the utility model is to provide a kind of capacitance type sensor precircuit, this precircuit has taken into full account the factor that may exert an influence to detecting data in test using capacitance sensor process, during with capacitance type sensor practical application, approach, for the research and development of capacitance type sensor provide true and reliable Data support.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: a kind of capacitance type sensor precircuit, comprise simulation pole plate circuit, the input end of described simulation pole plate circuit is connected with the analog input circuit that affects parameter signal for producing and send sensor package electrical parameter signal and sensor plate, and the output terminal of described simulation pole plate circuit is connected with for receiving and output transducer packaged battery mathematic(al) parameter signal and sensor plate affect the analog output circuit of parameter signal.Take into full account the electrical parameter producing due to the factor such as bonding wire and pad of such as electrode plate structure, encapsulation, guaranteed the accuracy of capacitance type sensor precircuit.Avoid causing detected value inaccurate because capacitance type sensor precircuit approaches actual value not, in order to avoid distortion when slip-stick artist's design circuit.
Preferably, described simulation pole plate circuit comprises analogous pole drive circuit and simulation pole plate testing circuit, described simulation pole plate testing circuit comprises analog detection electric capacity one and the analog detection electric capacity two of series connection, the a string gang mould of described analog detection electric capacity is intended monitored body resistance anti-, the analog detection electric capacity two analog detection bulk resistor anti-two of connecting, the analog-driven electric capacity one that comprises series connection and the analog-driven electric capacity two of described analogous pole drive circuit, the a string gang mould of described analog-driven electric capacity is intended driving body electrical impedance one, the analog-driven electric capacity two analog-driven bulk resistor anti-two of connecting, between analog detection bulk resistor anti-one and analog-driven bulk resistor anti-, be connected with coupling capacitance one, between analog detection bulk resistor anti-two and analog-driven bulk resistor anti-two, be connected with coupling capacitance two, between described analog detection bulk resistor anti-one and analog-driven bulk resistor anti-, be connected with coupling capacitance one, the tie point that analog detection electric capacity one is connected with analog detection electric capacity two is connected through anti-three tie points of connecting with analog-driven electric capacity two with analog-driven electric capacity one of analog detection bulk resistor, the top crown of described analog detection electric capacity one, analog detection bulk resistor anti-one, the top crown of analog-driven electric capacity one, the connecting circuit composition simulation top crown circuit of analog detection bulk resistor anti-one and coupling capacitance one, the bottom crown of analog detection electric capacity one, the top crown of analog detection electric capacity two, the bottom crown of analog-driven electric capacity one, pole plate circuit in the connecting circuit composition simulation of the top crown of analog-driven electric capacity two and analog detection bulk resistor anti-three, the bottom crown of analog detection electric capacity two, analog detection bulk resistor anti-two, the bottom crown of analog-driven electric capacity two, the connecting circuit composition simulation bottom crown circuit of analog-driven bulk resistor anti-two and coupling capacitance two.The signal that drives capacitance type sensor precircuit to detect by analogous pole drive circuit, then detects driven signal through simulation pole plate testing circuit, and analog electrical capacity sensor is changed the process that changes detection signal by polar plate spacing.Described analogous pole drive circuit is connected by coupling capacitance with simulation pole plate testing circuit, has reduced undesired signal.
Preferably, described analog input circuit comprises that encapsulation parameter input circuit and pole plate affect parameter input circuit, described encapsulation parameter input circuit connects pole plate affects parameter input circuit, and described pole plate affects the input end of parameter input circuit connecting analog pole plate driving circuit.Because capacitance type sensor is subject to the bonding wire at for example tie point place of encapsulating structure and the impact of the electrical parameter that pad produces in testing process.Be subject in addition leak impedance and the isoparametric impact of stray capacitance that capacitor plate produces.Therefore in the time doing capacitance type sensor precircuit, packed part and capacitor pole board parameter need be taken into account, replace and affect parameter, the actual testing environment of analog electrical capacity sensor accordingly with corresponding components and parts.The electrical parameter of described encapsulation parameter input circuit for driving packed part to produce, described pole plate affects parameter input circuit for driving affecting parameter and respectively simulating the coupling capacitance between pole plate circuit on simulation top crown circuit, simulation pole plate circuit and simulation bottom crown circuit.
Preferably, described pole plate affects parameter input circuit and comprises and be separately positioned in simulation top crown circuit and simulation between pole plate circuit in input end coupling capacitance one, simulation the input end coupling capacitance two between pole plate circuit and simulation bottom crown circuit and simulate top crown circuit and simulate the input end coupling capacitance three between bottom crown circuit, on simulation top crown circuit and simulation bottom crown circuit, be also connected with respectively input end leak impedance and input end analog parasitic electric capacity, and input end leak impedance and the equal ground connection of input end analog parasitic electric capacity.Pole plate affects parameter input circuit and mainly drives coupling capacitance, the simulation top crown circuit and input end leak impedance and the input end analog parasitic electric capacity of simulating on bottom crown circuit between each simulation pole plate circuit.
Preferably, described encapsulation parameter input circuit comprises input end artifical resistance and input end simulaed inductance, input link at simulation top crown circuit and simulation bottom crown circuit is all connected with described input end artifical resistance, described input end artifical resistance connects one end of input end simulaed inductance, the other end of input end simulaed inductance connects input end artificial capacitor, described input end artificial capacitor ground connection.Encapsulation parameter input circuit mainly drives input end simulaed inductance, input end artifical resistance and the input end artificial capacitor of packed part.
Preferably, described analog output circuit comprises that encapsulation parameter output circuit and pole plate affect parameter output circuit, described pole plate affects parameter output circuit connection encapsulation parameter output circuit, and described pole plate affects the output terminal of parameter output circuit connecting analog pole plate testing circuit.Described encapsulation parameter output circuit is for detection of the electrical parameter of packed part generation after encapsulation parameter input circuit drives.Electrical parameter detection being exerted an influence by encapsulation parameter input circuit and encapsulation parameter output circuit simulation packed part.Affect parameter output circuit by pole plate and detect affecting parameter and respectively simulating the coupling capacitance between pole plate circuit on pole plate circuit and simulation bottom crown circuit in simulation top crown circuit, simulation, affect parameter input circuit and pole plate affects the coupling capacitance between parameter and each pole plate circuit that affects producing on the each pole plate circuit of parameter output circuit analog electrical capacity sensor by pole plate.
Preferably, described pole plate affect parameter output circuit comprise be separately positioned on simulation top crown circuit and simulate in output terminal coupling capacitance one between pole plate circuit, output terminal coupling capacitance three between output terminal coupling capacitance two in simulation between pole plate circuit and simulation bottom crown circuit and simulation top crown circuit and simulation bottom crown circuit, at simulation top crown circuit, in simulation, on pole plate circuit and simulation bottom crown circuit, be also connected with respectively output terminal leak impedance and output terminal analog parasitic electric capacity and described output terminal leak impedance and output terminal analog parasitic capacity earth.Output terminal coupling capacitance is for detection of the coupled signal driving through input end coupling capacitance, output terminal leak impedance is for detection of the leak impedance driving through input end leak impedance, and output terminal analog parasitic electric capacity is for detection of the stray capacitance driving through input end analog parasitic electric capacity.The impact that coupling capacitance parameter between described three input end coupling capacitances and three pole plates of three output terminal coupling capacitance analog electrical capacity sensors produces; The leak impedance producing on described input end leak impedance and output terminal leak impedance analog capacitor top crown circuit and bottom crown circuit; Described input end analog parasitic capacitance simulation pole plate and element generation around capacitance relation, i.e. stray capacitance.Take into full account the influence factor that the Sensor section of capacitance type sensor may be subject to, made capacitance type sensor precircuit more approach real capacitance type sensor.
Preferably, described encapsulation parameter output circuit comprises output terminal artifical resistance and output terminal simulaed inductance, in simulation top crown circuit, simulation, the output link of pole plate circuit and simulation bottom crown circuit is all connected with described output terminal artifical resistance, described output terminal artifical resistance connects one end of output terminal simulaed inductance, the other end of output terminal simulaed inductance connects output terminal artificial capacitor, described output terminal artificial capacitor ground connection.Described output terminal artifical resistance is for detection of the resistance signal driving through input end artifical resistance, and described output terminal artifical resistance and input end artifical resistance are for the resistance parameter of artificial capacitor formula sensor package part pad and bonding wire generation; Described output terminal simulaed inductance is for detection of the inductance signal driving through input end simulaed inductance, the inductance of described output terminal simulaed inductance and input end simulaed inductance artificial capacitor formula sensor package part pad and bonding wire generation; Described output terminal artificial capacitor is for detection of the capacitance signal driving through input end artificial capacitor, the electric capacity of described output terminal artificial capacitor and input end artificial capacitor artificial capacitor formula sensor package part pad and bonding wire generation.Take into full account the influence factor that the packed part of capacitance type sensor may be subject to, made capacitance type sensor precircuit more approach real capacitance type sensor.
Preferably, analog detection electric capacity one, analog detection electric capacity two and analog-driven electric capacity one and the analog-driven electric capacity two in described simulation pole plate testing circuit is tunable capacitor.Precircuit is for describing approx the electrical specification of side circuit.According to the different operating condition of side circuit and the different requirements to precircuit degree of accuracy, should simulate same side circuit with different precircuits.Analog detection electric capacity one, analog detection electric capacity two and analog-driven electric capacity one and analog-driven electric capacity two adopt tunable capacitor, in the time of the different condition of work of simulation and degree of accuracy requirement, directly regulate tunable capacitor to realize, without dismounting again, simple to operate, shorten R&D cycle of slip-stick artist.
Adopt after technique scheme, the utlity model has following advantage:
(1) described capacitance type sensor precircuit has taken into full account the influence factor of Sensor section and packed part, makes the more approaching capacitance type sensor truly of precircuit.In the time that slip-stick artist carries out circuit design and system emulation, can effectively carry out the detection of True Data, guarantee circuit design precision.
(2) affect argument section and analogous pole plate portion has included driving circuit at encapsulation parameter part, the pole plate of described capacitance type sensor precircuit, drive signal by driving circuit, said capacitance type sensor precircuit, without outer signal source, has been simplified design circuit.
(3) two and two analog sensors of analog detection electric capacity one, analog detection electric capacity described in drive electric capacity to be tunable capacitor direct adjusting tunable capacitor in the time of the different condition of work of simulation and degree of accuracy requirement and can realize, without dismounting again, simple to operate, shorten R&D cycle of slip-stick artist.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
Fig. 1 is the utility model structured flowchart;
Fig. 2 is the utility model capacitance type sensor close loop control circuit connection layout;
Fig. 3 is the circuit diagram of the utility model embodiment.
Embodiment
Because traditional capacitance type sensor precircuit design is too simple, ignore the factor that a lot of capacitance type sensors exert an influence to detected value in testing process, in the time utilizing capacitance type sensor precircuit design circuit, easily cause error, make research and development with actual product between gap larger.Capacitance type sensor precircuit of the present utility model, has considered each influence factor under actual testing environment fully, makes detected value approach the most the detection case under true environment, can provide true and reliable Data support for slip-stick artist's research and development.
As shown in Figure 1, a kind of capacitance type sensor precircuit, comprise simulation pole plate circuit 1, the input end of described simulation pole plate circuit 1 is connected with the analog input circuit that affects parameter signal for producing and send sensor package electrical parameter signal and sensor plate, and the output terminal of described simulation pole plate circuit 1 is connected with for receiving and output transducer packaged battery mathematic(al) parameter signal and sensor plate affect the analog output circuit of parameter signal.
In the present embodiment, described simulation pole plate circuit 1 comprises analogous pole drive circuit and simulation pole plate testing circuit, described simulation pole plate testing circuit comprises analog detection electric capacity one and the analog detection electric capacity two of series connection, the a string gang mould of described analog detection electric capacity is intended monitored body resistance anti-, the analog detection electric capacity two analog detection bulk resistor anti-two of connecting, the analog-driven electric capacity one that comprises series connection and the analog-driven electric capacity two of described analogous pole drive circuit, the a string gang mould of described analog-driven electric capacity is intended driving body electrical impedance one, the analog-driven electric capacity two analog-driven bulk resistor anti-two of connecting, between analog detection bulk resistor anti-one and analog-driven bulk resistor anti-, be connected with coupling capacitance one, between analog detection bulk resistor anti-two and analog-driven bulk resistor anti-two, be connected with coupling capacitance two, between described analog detection bulk resistor anti-one and analog-driven bulk resistor anti-, be connected with coupling capacitance one, the tie point that analog detection electric capacity one is connected with analog detection electric capacity two is connected through anti-three tie points of connecting with analog-driven electric capacity two with analog-driven electric capacity one of analog detection bulk resistor, the top crown of described analog detection electric capacity one, analog detection bulk resistor anti-one, the top crown of analog-driven electric capacity one, the connecting circuit composition simulation top crown circuit of analog detection bulk resistor anti-one and coupling capacitance one, the bottom crown of analog detection electric capacity one, the top crown of analog detection electric capacity two, the bottom crown of analog-driven electric capacity one, pole plate circuit in the connecting circuit composition simulation of the top crown of analog-driven electric capacity two and analog detection bulk resistor anti-three, the bottom crown of analog detection electric capacity two, analog detection bulk resistor anti-two, the bottom crown of analog-driven electric capacity two, the connecting circuit composition simulation bottom crown circuit of analog-driven bulk resistor anti-two and coupling capacitance two.Drive the signal on capacitance type sensor precircuit pole plate by analogous pole drive circuit, and by simulation pole plate testing circuit, the signal driving is detected.The driving signal of pole plate part is mainly produced by analog-driven electric capacity one and analog-driven electric capacity two, then detects through analog detection electric capacity two and analog detection bulk resistor anti-two size that drives signal.
In actual test using capacitance sensor process, conventionally can be subject to the impact of the electrical parameter that this body structure of capacitor plate and packed part produce, the electrical parameter impact that therefore capacitance type sensor precircuit should produce this body structure of capacitor plate and packed part is taken into account.
Therefore analog input circuit described in the utility model comprises that encapsulation parameter input circuit 5 and pole plate affect parameter input circuit 2, described encapsulation parameter input circuit 5 connects pole plate affects parameter input circuit 2, and described pole plate affects the input end of parameter input circuit 2 connecting analog pole plate driving circuits.Analog output circuit comprises that encapsulation parameter output circuit 4 and pole plate affect parameter output circuit 3, described pole plate affects parameter output circuit 3 connection encapsulation parameter output circuits 4, and described pole plate affects the output terminal of parameter output circuit 3 connecting analog pole plate testing circuits.
Described pole plate affects parameter input circuit 2 and comprises and be separately positioned in simulation top crown circuit and simulation between pole plate circuit in input end coupling capacitance one, simulation the input end coupling capacitance two between pole plate circuit and simulation bottom crown circuit and simulate top crown circuit and simulate the input end coupling capacitance three between bottom crown circuit, on simulation top crown circuit and simulation bottom crown circuit, be also connected with respectively input end leak impedance and input end analog parasitic electric capacity, and input end leak impedance and the equal ground connection of input end analog parasitic electric capacity.
Described encapsulation parameter input circuit 5 comprises input end artifical resistance and input end simulaed inductance, input link at simulation top crown circuit and simulation bottom crown circuit is all connected with described input end artifical resistance, described input end artifical resistance connects one end of input end simulaed inductance, the other end of input end simulaed inductance connects input end artificial capacitor, described input end artificial capacitor ground connection.
Described pole plate affects parameter output circuit 3 and comprises the output terminal coupling capacitance three being separately positioned in simulation top crown circuit and simulation between pole plate circuit between the output terminal coupling capacitance two between pole plate circuit and simulation bottom crown circuit in output terminal coupling capacitance one, simulation and simulation top crown circuit and simulation bottom crown circuit, pole plate circuit and simulate on bottom crown circuit and be also connected with respectively output terminal leak impedance and output terminal analog parasitic electric capacity and described output terminal leak impedance and output terminal analog parasitic capacity earth in simulating top crown circuit, simulating.
Described encapsulation parameter output circuit 4 comprises output terminal artifical resistance and output terminal simulaed inductance, in simulation top crown circuit, simulation, the output link of pole plate circuit and simulation bottom crown circuit is all connected with described output terminal artifical resistance, described output terminal artifical resistance connects one end of output terminal simulaed inductance, the other end of output terminal simulaed inductance connects output terminal artificial capacitor, described output terminal artificial capacitor ground connection.
As a kind of preferred embodiment, analog detection electric capacity one, analog detection electric capacity two and analog-driven electric capacity one and analog-driven electric capacity two in described simulation pole plate testing circuit are tunable capacitor.In the time that the different condition of work of simulation and degree of accuracy require, can directly regulate tunable capacitor simulation different operating environment and meet different precision requirement, without dismounting again, simple to operate, shorten R&D cycle of slip-stick artist.
Referring to Fig. 3, the analogous pole drive circuit described in the capacitance type sensor precircuit described in the present embodiment is provided with two analog-driven electric capacity, is respectively analog-driven electric capacity one C
1with analog-driven electric capacity two C
2, described analog-driven electric capacity one C
1the anti-R of series connection analog-driven bulk resistor
1, analog-driven electric capacity two C
2anti-two R of series connection analog-driven bulk resistor
2, by analog-driven electric capacity one C
1with analog-driven electric capacity two C
2series connection, simulation pole plate testing circuit includes analog detection electric capacity one C
3the anti-R of series connection analog detection bulk resistor
3, analog detection electric capacity two C
4anti-two R of series connection analog detection bulk resistor
4, analog detection electric capacity one C
3with analog detection electric capacity two C
4series connection, analog-driven electric capacity one C
1with analog-driven electric capacity two C
2the tie point of series connection is through anti-three R of analog detection bulk resistor
15connecting analog Detection capacitance three C
3with analog detection electric capacity four C
4tie point.Analog-driven bulk resistor resists a R
1through coupling capacitance one C
5connecting analog monitored body resistance resists a R
3, analog-driven bulk resistor resists two R
2through coupling capacitance one C
6connecting analog monitored body resistance resists two R
4.Described analog-driven electric capacity one C
1top crown, the anti-R of analog-driven bulk resistor
1, coupling capacitance one C
5, analog detection electric capacity one C
3top crown and analog detection bulk resistor resist a R
3the circuit of composition forms simulation top crown circuit, analog-driven electric capacity one C
1bottom crown, analog detection electric capacity one C
3bottom crown, anti-three R of analog detection bulk resistor
15, analog detection electric capacity two C
4top crown and analog-driven electric capacity two C
2the circuit of top crown composition forms pole plate circuit in simulation, described analog-driven electric capacity two C
2bottom crown, anti-two R of analog-driven bulk resistor
2, analog detection electric capacity two C
4bottom crown and analog detection bulk resistor resist two R
4the circuit of composition forms pole plate circuit in simulation.
Analog output circuit comprises that pole plate affects parameter output circuit and encapsulation parameter output circuit, and described pole plate affects parameter output circuit and comprises and be separately positioned on output terminal coupling capacitance one C between pole plate circuit in simulation top crown circuit and simulation
14, output terminal coupling capacitance two C in simulation between pole plate circuit and simulation bottom crown circuit
15, between simulation top crown circuit and simulation bottom crown circuit output terminal coupling capacitance three C
16, anti-three R of described analog detection bulk resistor
15be connected to output terminal coupling capacitance one C
14with output terminal coupling capacitance two C
15tie point place.On simulation top crown circuit, be connected with output terminal leak impedance one R for representing top crown leak impedance
9and represent output terminal analog parasitic electric capacity one C of capacitance relation between top crown and housing and between wire
17, on simulation bottom crown circuit, be connected with output terminal leak impedance two R for representing bottom crown leak impedance
11and represent output terminal analog parasitic electric capacity two C of capacitance relation between bottom crown and housing and between wire
19, in simulation, on pole plate circuit, be connected with too output terminal leak impedance three R
10with output terminal analog parasitic electric capacity three output terminal C
18, then, respectively by the output link pad1 of simulation top crown circuit, in simulation, the output link pad3 of the output link pad2 of pole plate circuit and simulation bottom crown circuit is connected to encapsulation parameter output circuit.Described encapsulation parameter output circuit comprises with the output link pad1 of simulation top crown circuit and being connected by output terminal artifical resistance one R
12with output terminal simulaed inductance one L
3one end of series connection, described output terminal simulaed inductance one L
3one end connect output terminal artificial capacitor one C
20, output terminal artificial capacitor one C
20ground connection.In simulation, the output terminal link pad2 of pole plate circuit connects by output terminal artifical resistance two R
13with output terminal simulaed inductance two L
4one end of series connection, described output terminal simulaed inductance two L
4one end connect output terminal artificial capacitor two C
21, output terminal artificial capacitor two C
21ground connection.The output terminal link pad3 of bottom crown connects by output terminal artifical resistance three R
14with output terminal simulaed inductance three L
5one end of series connection, described output terminal simulaed inductance two L
5one end connect output terminal artificial capacitor two C
22, output terminal artificial capacitor two C
22ground connection.Described output terminal simulaed inductance one L
3with output terminal artificial capacitor one C
20tie point is as output terminal one S
1, similarly, have output terminal two S
2with output terminal Three S's
3.
Analogous pole drive circuit also connects pole plate affects parameter output circuit, and described pole plate affects parameter output circuit and comprises and be arranged on input end coupling capacitance one C between pole plate circuit in simulation top crown circuit and simulation
7, input end coupling capacitance two C in simulation between pole plate circuit and simulation bottom crown circuit
8, input end coupling capacitance three C on simulation top crown circuit and simulation bottom crown circuit
9.On simulation top crown circuit, be connected with input end leak impedance one R for driving simulation top crown leak impedance signal
5input end analog parasitic electric capacity one C with the stray capacitance signal for driving simulation top crown circuit
10, and input end analog parasitic electric capacity one C
10for simulating top crown input end pad4, similarly, on simulation bottom crown circuit, be connected with input end leak impedance two R with the tie point of simulation top crown circuit
6with input end analog parasitic electric capacity two C
11, and input end analog parasitic electric capacity two C
11be to simulate bottom crown input end pad5, described simulation top crown input end pad4 and simulation bottom crown input end pad5 connection encapsulation parameter input circuit with simulation bottom crown circuit tie point.
Described encapsulation parameter input circuit comprises input end simulaed inductance, input end artifical resistance and the input end artificial capacitor of the inductance, resistance and the capacitance signal that drive encapsulation welding tray and bonding wire.Simulation top crown input end pad4 connects input end artifical resistance one R
7one end, input end artifical resistance one R
7the other end connect input end simulaed inductance one L
1, described input end simulaed inductance one L
1connect input end artificial capacitor one C
12, described input end artificial capacitor one C
12ground connection.Similarly, simulation bottom crown input end pad5 connects input end artifical resistance two R
8one end, input end artifical resistance two R
8the other end connect input end simulaed inductance two L
2, described input end simulaed inductance two L
2connect input end artificial capacitor two C
13, described input end artificial capacitor two C
13ground connection.Input end simulaed inductance one L
1with input end artificial capacitor one C
12link be input end D
1, input end simulaed inductance two L
2with input end artificial capacitor two C
13link be input end D
2.
Use capacitance type sensor precircuit described in the utility model to carry out Close-loop Control System Design, as shown in Figure 2.The output terminal S of described capacitance type sensor
1, S
2and S
3connect front-end amplifier the signal collecting is amplified, and by exporting after filter filtering, simultaneously by the signal back input end D of output
1and D
2, complete closed-loop control system.
Capacitance type sensor described in the utility model has taken into full account the various parameters that affect while detection, has guaranteed the accuracy detecting.In the time that slip-stick artist carries out circuit design and Control System Design, can carry out exactly Data Detection, reduce the design error of circuit or control system.
Except above preferred embodiment, the utility model also has other embodiment, those skilled in the art can make various changes and distortion according to the utility model, only otherwise depart from spirit of the present utility model, all should belong to the defined scope of the utility model claims.
Claims (9)
1. a capacitance type sensor precircuit, comprise simulation pole plate circuit (1), it is characterized in that: the input end of described simulation pole plate circuit (1) is connected with the analog input circuit that affects parameter signal for producing and send sensor package electrical parameter signal and sensor plate, the output terminal of described simulation pole plate circuit (1) is connected with for receiving and output transducer packaged battery mathematic(al) parameter signal and sensor plate affect the analog output circuit of parameter signal.
2. capacitance type sensor precircuit according to claim 1, it is characterized in that: described simulation pole plate circuit (1) comprises analogous pole drive circuit and simulation pole plate testing circuit, described simulation pole plate testing circuit comprises analog detection electric capacity one and the analog detection electric capacity two of series connection, the a string gang mould of described analog detection electric capacity is intended monitored body resistance anti-, the analog detection electric capacity two analog detection bulk resistor anti-two of connecting, the analog-driven electric capacity one that comprises series connection and the analog-driven electric capacity two of described analogous pole drive circuit, the a string gang mould of described analog-driven electric capacity is intended driving body electrical impedance one, the analog-driven electric capacity two analog-driven bulk resistor anti-two of connecting, between analog detection bulk resistor anti-one and analog-driven bulk resistor anti-, be connected with coupling capacitance one, between analog detection bulk resistor anti-two and analog-driven bulk resistor anti-two, be connected with coupling capacitance two, between described analog detection bulk resistor anti-one and analog-driven bulk resistor anti-, be connected with coupling capacitance one, the tie point that analog detection electric capacity one is connected with analog detection electric capacity two is connected through anti-three tie points of connecting with analog-driven electric capacity two with analog-driven electric capacity one of analog detection bulk resistor, the top crown of described analog detection electric capacity one, analog detection bulk resistor anti-one, the top crown of analog-driven electric capacity one, the connecting circuit composition simulation top crown circuit of analog detection bulk resistor anti-one and coupling capacitance one, the bottom crown of analog detection electric capacity one, the top crown of analog detection electric capacity two, the bottom crown of analog-driven electric capacity one, pole plate circuit in the connecting circuit composition simulation of the top crown of analog-driven electric capacity two and analog detection bulk resistor anti-three, the bottom crown of analog detection electric capacity two, analog detection bulk resistor anti-two, the bottom crown of analog-driven electric capacity two, the connecting circuit composition simulation bottom crown circuit of analog-driven bulk resistor anti-two and coupling capacitance two.
3. capacitance type sensor precircuit according to claim 2, it is characterized in that: described analog input circuit comprises that encapsulation parameter input circuit (5) and pole plate affect parameter input circuit (2), described encapsulation parameter input circuit (5) connects pole plate affects parameter input circuit (2), and described pole plate affects the input end of parameter input circuit (2) connecting analog pole plate driving circuit.
4. capacitance type sensor precircuit according to claim 3, it is characterized in that: described pole plate affect parameter input circuit (2) comprise be separately positioned on simulation top crown circuit and simulate in input end coupling capacitance one between pole plate circuit, input end coupling capacitance three between input end coupling capacitance two in simulation between pole plate circuit and simulation bottom crown circuit and simulation top crown circuit and simulation bottom crown circuit, on simulation top crown circuit and simulation bottom crown circuit, be also connected with respectively input end leak impedance and input end analog parasitic electric capacity, and input end leak impedance and the equal ground connection of input end analog parasitic electric capacity.
5. capacitance type sensor precircuit according to claim 3, it is characterized in that: described encapsulation parameter input circuit (5) comprises input end artifical resistance and input end simulaed inductance, input link at simulation top crown circuit and simulation bottom crown circuit is all connected with described input end artifical resistance, described input end artifical resistance connects one end of input end simulaed inductance, the other end of input end simulaed inductance connects input end artificial capacitor, described input end artificial capacitor ground connection.
6. capacitance type sensor precircuit according to claim 2, it is characterized in that: described analog output circuit comprises that encapsulation parameter output circuit (4) and pole plate affect parameter output circuit (3), described pole plate affects parameter output circuit (3) connection encapsulation parameter output circuit (4), and described pole plate affects the output terminal of parameter output circuit (3) connecting analog pole plate testing circuit.
7. capacitance type sensor precircuit according to claim 6, it is characterized in that: described pole plate affect parameter output circuit (3) comprise be separately positioned on simulation top crown circuit and simulate in output terminal coupling capacitance one between pole plate circuit, output terminal coupling capacitance three between output terminal coupling capacitance two in simulation between pole plate circuit and simulation bottom crown circuit and simulation top crown circuit and simulation bottom crown circuit, at simulation top crown circuit, in simulation, on pole plate circuit and simulation bottom crown circuit, be also connected with respectively output terminal leak impedance and output terminal analog parasitic electric capacity and described output terminal leak impedance and output terminal analog parasitic capacity earth.
8. capacitance type sensor precircuit according to claim 6, it is characterized in that: described encapsulation parameter output circuit (4) comprises output terminal artifical resistance and output terminal simulaed inductance, in simulation top crown circuit, simulation, the output link of pole plate circuit and simulation bottom crown circuit is all connected with described output terminal artifical resistance, described output terminal artifical resistance connects one end of output terminal simulaed inductance, the other end of output terminal simulaed inductance connects output terminal artificial capacitor, described output terminal artificial capacitor ground connection.
9. capacitance type sensor precircuit according to claim 2, is characterized in that: analog detection electric capacity one, analog detection electric capacity two and analog-driven electric capacity one and analog-driven electric capacity two in described simulation pole plate testing circuit are tunable capacitor.
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| CN201320682682.XU CN203642951U (en) | 2013-10-31 | 2013-10-31 | Capacitive-type sensor model circuit |
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| CN201320682682.XU CN203642951U (en) | 2013-10-31 | 2013-10-31 | Capacitive-type sensor model circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575321A (en) * | 2013-10-31 | 2014-02-12 | 嘉兴市纳杰微电子技术有限公司 | Capacitive sensor model circuit |
| CN107076569A (en) * | 2014-11-05 | 2017-08-18 | 诺基亚技术有限公司 | Apparatus and method for sensing |
-
2013
- 2013-10-31 CN CN201320682682.XU patent/CN203642951U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575321A (en) * | 2013-10-31 | 2014-02-12 | 嘉兴市纳杰微电子技术有限公司 | Capacitive sensor model circuit |
| CN103575321B (en) * | 2013-10-31 | 2016-05-18 | 嘉兴市纳杰微电子技术有限公司 | A kind of capacitance type sensor precircuit |
| CN107076569A (en) * | 2014-11-05 | 2017-08-18 | 诺基亚技术有限公司 | Apparatus and method for sensing |
| US10222231B2 (en) | 2014-11-05 | 2019-03-05 | Nokia Technologies Oy | Apparatus and method for sensing |
| CN107076569B (en) * | 2014-11-05 | 2019-10-29 | 诺基亚技术有限公司 | Device and method for sensing |
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