CN108958139A - Program-controlled capacitance simulation module based on transconductance type amplifier - Google Patents
Program-controlled capacitance simulation module based on transconductance type amplifier Download PDFInfo
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- CN108958139A CN108958139A CN201811137258.0A CN201811137258A CN108958139A CN 108958139 A CN108958139 A CN 108958139A CN 201811137258 A CN201811137258 A CN 201811137258A CN 108958139 A CN108958139 A CN 108958139A
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- 238000004088 simulation Methods 0.000 title claims abstract description 51
- 239000003990 capacitor Substances 0.000 claims abstract description 44
- 238000012545 processing Methods 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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- Automation & Control Theory (AREA)
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Abstract
The present invention proposes a kind of program-controlled capacitance simulation module based on transconductance type amplifier.The program-controlled capacitance simulation module realizes the equivalent capacitive reactance multiplication and decaying of capacitor using operational transconductance amplifier combination proportion adjustment using standard metering capacitor as reference capacitance；Increase level-one proportion adjustment between the output of reference capacitance operational transconductance amplifiers and capacitive feedback amplifier, the multiplication relationship of capacitance simulation output end and the end DA voltage is realized by multiplier to realize the amplification and decaying of program-controlled capacitor proportional component.The present invention improves the precision of output capacitance simulation and the continuity of capacitor output, reduces the volume and weight of capacitance simulator.
Description
Technical field
The present invention relates to a kind of program-controlled capacitance simulation modules.
Background technique
The program-controlled capacitance simulator of binary channels is used to emulate the working principle of actual capacitance formula liquid level sensor.Single set equipment is total
There are two capacitance simulation channel, the excitation input of 1 tunnel and the output of 1 road capacitance simulation are contained in each capacitance simulation channel.Capacitor
The working condition of the capacitance sensor of analog channel simulation reality, when external drive is added on the capacitor of different capabilities, meeting exists
A corresponding signal is exported on capacitor.Equipment simulates actual capacitance characteristic completely, and analog capacitor is arranged by standard agreement
Capacitance size.
The program-controlled capacitance simulator of binary channels is simulated using active device, is sent control instruction by host computer and is set capacitor mould
Quasi- device output needs the size of capacitance to be simulated, but simulator actually equivalent output be actual capacitance capacitive reactance characteristic, therefore
The capacitive reactance for detecting actual capacitance simulator can only be gone to export using the series connection capacitive reactance method of testing of digital electric bridge its test, no
The simulation of the capacitor charge and discharge of general field can may not apply to using method of testing test in parallel.
Currently, conventional program control type capacitance simulator circuit structure generally comprises two parts: 1. capacitor output control parts；
2. capacitance simulation part.Capacitor output control part sends control instruction, setting capacitance simulator output using host computer serial ports
Need the size (its capacitor exports minimum precision and determined by the standard capacitance minimum value encoded) of capacitance to be simulated, capacitance simulation
Part is cascaded the standard capacitance of different size with relay using specific coding form, utilizes control instruction switching relay
Cascade system realizes the output of equivalent capacity, and output capacitance precision determines (accuracy value is general are as follows: 1pF) by minimum capacity, fits
Together in the occasion of general capacitance simulation.The precision of generally existing capacitance simulation is not high, volume is larger, output capacitance simulation is discontinuous
The problems such as (using relay switching standards capacitor cascade system realize capacitance simulation output, as multi gear position continuously switches).
Summary of the invention
The present invention proposes a kind of program-controlled capacitance simulation module based on transconductance type amplifier, it is intended to improve output capacitance simulation
Precision and capacitor output continuity.
Solution of the invention is as follows:
The program-controlled capacitance simulation module based on transconductance type amplifier, including capacitance simulation part and program rate adjustment portion
Point；
The capacitance simulation part includes artificial capacitor input and output terminal, reference capacitance, the transconductance type fortune set gradually
Amplifier and feedback amplifier are calculated, the capacitance characteristic of reference capacitance is converted into transconductance type by the operational transconductance amplifiers
The output voltage characteristic of operational amplifier；The program rate adjusts part intervention operational transconductance amplifiers and feedback amplifier
Between, the voltage after program rate is adjusted feeds back to the reference capacitance through feedback amplifier；
The program rate adjustment portion point includes digital processing element, DA converter unit and multiplier unit；The number
Processing unit is for receiving host computer instruction, by instruction morphing output to DA converter unit；The first input end of multiplier unit
The output end of termination DA converter unit is inputted as program control signal, the second input of multiplier unit terminates the transconductance type operation
The output end of amplifier, the output of multiplier unit terminate the input terminal of the feedback amplifier.
Further, between the operational transconductance amplifiers and multiplier unit, it is additionally provided with voltage follower U9, is used
It is converted in impedance.
Further, needed for the digital processing element, DA converter unit, multiplier unit and artificial capacitor output module
Low-voltage dc power supply can be provided by same system power module.
Further, the preferred construction form of the system power supply module is: using DC/DC module, and configures low voltage difference
Linear voltage regulator (LDO).
Further, the reference capacitance uses standard metering capacitor.
Further, digital processing element can be communicated by RS485 interface and host computer, and be connect using isolating chip realization
Mouth isolation.
The invention has the following advantages:
1. improving the precision of output capacitance simulation and the continuity of capacitor output.Capacitance simulation output par, c is using linear
Analog device is realized, in this way, continuously transmitting the ratio value that instruction changes analog multiplier using host computer, can realize that dynamic connects
Continuous property capacitor output, therefore the program-controlled capacitance simulation module can cope with high-precision (accuracy value: 0.0153pF), dynamic continuity electricity
Hold the occasion of simulation output.The electricity of 1000/65535pF can be realized using 16 DA+ analog multipliers and 1000pF standard capacitance
Hold precision.
2. reducing the volume and weight of capacitance simulator.The design of the program-controlled capacitance simulator of binary channels focuses on optimization capacitor
Simulation output part changes the mode of the relay cascade switching of conventional, conventional program-controlled capacitance simulator single channel output
The capacitor and precision of 65535pF is 0.01pF, is cascaded using 8421 codings and needs 16*3 relay, 16*3 standard capacitance,
Binary channels then needs 32*3 relay, 32*3 standard capacitance, even if there is the standard capacitance needed and be able to achieve and originally set
The capacitance simulator of equal accuracy is counted, volume and weight is far longer than the volume and weight of several operational amplifiers.
It is not in because temperature change is brought 3. the temperature grade of wide scope can be coped with using the chip of technical grade or more
Capacitor export variation.
4. the present invention is also further optimized the particular circuit configurations of major circuit elements, more concisely, reliably
Ground realizes corresponding function in systems.
Detailed description of the invention
Fig. 1 is system architecture block diagram of the invention.
Fig. 2 is multiplier+artificial capacitor output par, c block diagram.
Fig. 3 is ultralow ripple DC/DC schematic diagram.
Fig. 4 is TPS7A47-LDO+12V output principle figure.
Fig. 5 is TPS7A33-LDO-12V output principle figure.
Fig. 6 is the 485 Principle of Communication figure of low voltage difference difference based on ADM2587.
Fig. 7 is central processor MCU and its relevant configuration circuit structure diagram.
Fig. 8 is address choice encoder schematic diagram.
Fig. 9 is two-way DA shift theory figure.
Figure 10 is a channel multiplier schematic diagram.
Figure 11 is a channel capacitor principle of simulation figure.
Figure 12 is two channel multiplier schematic diagrams.
Figure 13 is two channel capacitance simulation schematic diagrams.
Specific embodiment
The program-controlled capacitance simulation module based on transconductance type amplifier is broadly divided into system power supply module, capacitance simulation part
Part is adjusted with program rate.Wherein program rate adjusts part mainly by digital processing element, DA converter unit and multiplier
Unit composition；Relevant interface includes that 4 road SMA terminals (correspond to two-way excitation input, capacitance simulation output, are equivalent to simulation two
A capacitor, there are two pins for each capacitor), RS485 PORT COM and DC9-36V socket.System architecture is as shown in Figure 1.
The core of the program-controlled capacitance simulation module based on transconductance type amplifier is as shown in Fig. 2, utilize standard metering capacitor
As reference capacitance, the equivalent capacitive reactance multiplication and decaying of capacitor are realized using operational transconductance amplifier combination proportion adjustment.In base
Increase level-one proportion adjustment between the output of pseudo-capacitance operational transconductance amplifiers and capacitive feedback amplifier, is realized by multiplier
The multiplication relationship of capacitance simulation output end and the end DA voltage is to realize the amplification and decaying of program-controlled capacitor proportional component.
Digital processing element receives PC control instruction by system bus, is instructed and is passed through with corresponding algorithm process
Floor processor IO is exported to DA converter unit, and director data is converted to analog quantity；Four-quadrant analog multiplier converts DA
Analog quantity is multiplied with the output of capacitance simulation part leading portion characteristic, by result output capacitance analog portion rear end.
Capacitance simulation part is divided into two sections:
One section: the transconductance type amplification based on reference capacitance, it is using operational transconductance amplifiers that the capacitor of reference capacitance is special
Property is converted to the output voltage characteristic of trsanscondutance amplifier.
Two sections: by upper level multiplying-type digital-to-analogue conversion output as proportional component be inserted into one section of capacitance simulation circuit it
Afterwards, reference capacitance is fed back to through feedback amplifier for controlling the voltage output of operational transconductance amplifiers, to realize benchmark
The programming amplifying of capacitor and decaying, the equivalent capacitive reactance output of artificial capacitor.
Specific example explanation is made to each major circuit elements below:
1. system power supply module: the ripple of power end will affect the output accuracy of whole system, therefore system power supply is selected
Power supply of the ultralow ripple power supplies DC/DC module as whole system, further controls power supply ripple in conjunction with secondary LDO, to guarantee
The output accuracy of whole system.
Its realization principle is as shown in Fig. 3, Fig. 4 and Fig. 5.
For the power reguirements for meeting the program-controlled capacitance simulator of binary channels, system power supply interface selects VH3.96-6P power end
Son, power supply selection Hui Zhong DCDC low ripple linear isolation power supply, input DC9-36V, output ± 15V -500mA, ripple Vrms <
50mV,Vp-p<100Mv.Each program-controlled capacitance simulator of binary channels carries TI company LDO chip TPS7A47, TPS7A33 chip,
The chip supports external, programmable voltage output, may be implemented DC ± 12V → DC ± 40V DC power supply being converted to system institute
± the 12V DC needed.
2. digital processing element: the central processing unit based on STM32, main to complete host computer command reception, host computer refers to
It enables and control instruction is issued to by the program-controlled capacitor of binary channels by RS485 standard agreement, digital processing part will be instructed according to interior
Portion's rendezvous protocol is received and is exported instruction morphing to DA converter.
The program-controlled capacitance simulator of binary channels uses standard RS485 low voltage difference differential communication, and isolating chip selects ADM2587,
Complete half/full duplex RS-485 interface isolation is realized with single-chip.Each program-controlled capacitance simulator of binary channels has oneself solely
Vertical address code can be arranged the address 0-15 (address scrambler is as shown in Figure 8) by external toggle switch, can also pass through program
Curing system address,
Central processing unit selects stm32f103, and the data that the instruction that host computer is issued is converted to standard, which are exported to DA, to be become
Parallel operation；Realization principle is as shown in Figure 6,7.Wherein, the input terminal of RS485 interface shown in Fig. 6 are as follows:+R/T ,-R/T, RS485_G, it is defeated
Outlet are as follows: USART1_RX, USART1_TX, MCU shown in Fig. 7, the command input to receive host computer instruction are USART1_
RX, USART1_TX, digital controlled signal output end are as follows: SPI1_MISO, SPI1_MOSI, SPI1_SCK.
3.DA converter unit: the director data that digital processing element exports is converted into analog quantity, is supplied to multiplier, such as
Shown in Fig. 9；A digital command is embodied in Fig. 9 inputs two analog output channels, digital input end are as follows: SPI1_MISO,
SPI1_MOSI, SPI1_SCK (pass through program instruction and switch DA output channel and output valve), simulation output end be VOUTA,
VOUTB。
4. multiplier: realizing to the equivalent amplification of capacitor capacitive reactance and the proportional component of decaying, realization principle such as Figure 10,12
It is shown；Figure 10 is a channel multiplier, is inputted using VOUTA shown in Fig. 9 as program control signal, after the operational transconductance amplification of input
Voltage signal SING_IN1 be multiplied, SING_OUT1 be multiplier result export.Figure 12 is two channel multipliers, with Fig. 9 institute
Show that VOUTB is inputted as program control signal, is multiplied with the amplified voltage signal SING_IN2 of the operational transconductance of input, SING_
OUT2 is that the result of multiplier exports.
5. capacitance simulation part: the operational transconductance amplification based on reference capacitance, by the ratio system for adjusting multiplier output
Number realizes that the amplification of equivalent capacitive reactance and decaying export.Its realization principle is as shown in Figure 11,13；Figure 11 is that channel capacitor simulation is defeated
Out, J3, J4 are the terminals of artificial capacitor input and output, and U8A is operational transconductance amplifiers, and the capacitance characteristic of reference capacitance is turned
It is changed to the output voltage characteristic of operational transconductance amplifiers, U9A is that common amplifier realizes impedance transformation.Figure 13 is two channel capacitors
Simulation output, J5, J6 are the terminals of artificial capacitor input and output, and U10A is operational transconductance amplifiers, by the electricity of reference capacitance
Hold the output voltage characteristic that characteristic is converted to operational transconductance amplifiers, U11A is that common amplifier realizes impedance transformation.
The voltage output of voltage follower U9A-1 foot in Figure 11 are as follows: U9A-1 foot voltage=U9A-3 foot voltage=U8A-1 foot
Voltage=(- RF1*J3-1 foot voltage)/CR1 capacitive reactance, if the proportionality coefficient between SING_IN1 and SING_OUT1 is K, U9B-
7 foot voltages=K (- RF1*J3-1 foot voltage)/CR1 capacitive reactance；
U8B-5 foot voltage=U8B-6 foot voltage,
U8B-7 foot voltage=2*U8B-5 foot voltage；
D11 branch current is I2=[(U9B-7 foot voltage)-(U8B-5 foot voltage)]/R28+ [(U8B-7 foot voltage)-
(U8B-5 foot voltage)]/R29=- (U8B-5 foot voltage)]/R29；
Flowing through CR1 electric current is I2=U8A-1 foot voltage/CR1 capacitive reactance；One channel capacitor analog end I total current=I1+I2=
J3-1 foot voltage * (1+K*RF1/R29)；Therefore J3 input impedance is Rz=CR1 capacitive reactance/(1+K*RF1/R29)；Hold in conjunction with capacitor
Anti- formula Rc=1/ (2 π FC), can extrapolate output capacitance Ci=CR1* (1+K*RF1/R29), the Ci=CR1* as RF1=R29
(1+K)；As long as the range for therefore changing K value can simulate the output for needing equivalent capacitive reactance.
Claims (6)
1. the program-controlled capacitance simulation module based on transconductance type amplifier, it is characterised in that: including capacitance simulation part and program-controlled ratio
Example adjusts part；
The capacitance simulation part includes that the artificial capacitor input and output terminal, reference capacitance, transconductance type operation set gradually is put
Big device and feedback amplifier, are converted to transconductance type operation for the capacitance characteristic of reference capacitance by the operational transconductance amplifiers
The output voltage characteristic of amplifier；The program rate adjust part intervention operational transconductance amplifiers and feedback amplifier it
Between, the voltage after program rate is adjusted feeds back to the reference capacitance through feedback amplifier；
The program rate adjustment portion point includes digital processing element, DA converter unit and multiplier unit；The digital processing
Unit is for receiving host computer instruction, by instruction morphing output to DA converter unit；The first input end conduct of multiplier unit
The output end of program control signal input termination DA converter unit, the second input of multiplier unit terminate the transconductance type operation amplifier
The output end of device, the output of multiplier unit terminate the input terminal of the feedback amplifier.
2. the program-controlled capacitance simulation module according to claim 1 based on transconductance type amplifier, it is characterised in that: it is described across
Between conductivity type operational amplifier and multiplier unit, it is additionally provided with voltage follower U9.
3. the program-controlled capacitance simulation module according to claim 1 based on transconductance type amplifier, it is characterised in that: the number
Low-voltage dc power supply needed for word processing unit, DA converter unit, multiplier unit and artificial capacitor output module is by same system
Power module of uniting provides.
4. the program-controlled capacitance simulation module according to claim 3 based on transconductance type amplifier, it is characterised in that: the system
Power module of uniting uses DC/DC module, and is configured with low pressure difference linear voltage regulator (LDO).
5. the program-controlled capacitance simulation module according to claim 1 based on transconductance type amplifier, it is characterised in that: the base
Pseudo-capacitance uses standard metering capacitor.
6. the program-controlled capacitance simulation module according to claim 1 based on transconductance type amplifier, it is characterised in that: the number
Word processing unit is communicated by RS485 interface and host computer, and realizes interface isolation using isolating chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811137258.0A CN108958139A (en) | 2018-09-27 | 2018-09-27 | Program-controlled capacitance simulation module based on transconductance type amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811137258.0A CN108958139A (en) | 2018-09-27 | 2018-09-27 | Program-controlled capacitance simulation module based on transconductance type amplifier |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4383230A (en) * | 1979-09-24 | 1983-05-10 | Manzolini David B | Voltage tuned active filter and circuitry simulating a capacitance and an inductance |
| CN104811182A (en) * | 2015-05-11 | 2015-07-29 | 中国矿业大学 | Flux linkage coupled mode memcapacitor artificial circuit |
| CN104836543A (en) * | 2015-04-29 | 2015-08-12 | 湘潭大学 | Active inductance simulator and capacitance amplifier circuit based on operational transconductance amplifiers |
| CN105161303A (en) * | 2015-08-04 | 2015-12-16 | 武汉科技大学 | Implementation circuit of adjustable capacitor |
| CN208781027U (en) * | 2018-09-27 | 2019-04-23 | 西安翔迅科技有限责任公司 | Program-controlled capacitance simulation module based on transconductance type amplifier |
-
2018
- 2018-09-27 CN CN201811137258.0A patent/CN108958139A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4383230A (en) * | 1979-09-24 | 1983-05-10 | Manzolini David B | Voltage tuned active filter and circuitry simulating a capacitance and an inductance |
| CN104836543A (en) * | 2015-04-29 | 2015-08-12 | 湘潭大学 | Active inductance simulator and capacitance amplifier circuit based on operational transconductance amplifiers |
| CN104811182A (en) * | 2015-05-11 | 2015-07-29 | 中国矿业大学 | Flux linkage coupled mode memcapacitor artificial circuit |
| CN105161303A (en) * | 2015-08-04 | 2015-12-16 | 武汉科技大学 | Implementation circuit of adjustable capacitor |
| CN208781027U (en) * | 2018-09-27 | 2019-04-23 | 西安翔迅科技有限责任公司 | Program-controlled capacitance simulation module based on transconductance type amplifier |
Non-Patent Citations (1)
| Title |
|---|
| 王淅蓉 等: "电子式程控电阻、电容通用模拟器设计", 电子技术, pages 61 - 63 * |
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