CN208206178U - A kind of constant current or constant pressure sensor analog system - Google Patents
A kind of constant current or constant pressure sensor analog system Download PDFInfo
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- CN208206178U CN208206178U CN201820852175.9U CN201820852175U CN208206178U CN 208206178 U CN208206178 U CN 208206178U CN 201820852175 U CN201820852175 U CN 201820852175U CN 208206178 U CN208206178 U CN 208206178U
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Abstract
The utility model discloses a kind of constant current or constant pressure sensor analog systems, including signal generating unit, the output end of signal generating unit is connected with signal imitation unit, signal imitation unit for realizing sensor signal simulation, the output end of signal imitation unit is connected with signal buffer smooth unit, signal buffer smooth unit is used for the sensor signal that adjustment signal analogue unit issues, in order to which the sample circuit of the signal and Devices to test matches, and the sensor signal adjusted is sent to Devices to test；The utility model abandoned it is traditional utilize physical sensor, construct local test environment in laboratory environments, come verify equipment under test ability to work method.It is easily programmed using one-chip computer chip, smooth and load capacity raising of the digital regulation resistance convenient for control and integral buffer circuit to output signal, ingenious cooperation, Sensor Analog Relay System circuit is constituted, provides the sensor signal under true, effective various environmental conditions for equipment under test.
Description
[technical field]
The utility model belongs to electronic measuring technology field more particularly to a kind of constant current or constant pressure sensor analog system.
[background technique]
In electronic surveying field, it is often necessary in laboratory environments, be simulated to various kinds of sensors, be equipment under test
All kinds of analog signals are provided, the ability worked normally under all kinds of operating conditions is devices under with verifying.
Common analogy method is in laboratory environments, using the sensor similar with equipment under test, to construct part examination
Environment is tested, to verify the ability to work of equipment under test, equivalent block diagram is as shown in Figure 1, still, this method is clearly present following
Problem:
1, need to construct working sensor environment in laboratory: the working environment of sensor may be very extreme, such as: high/
Low temperature, high pressure, vacuum, high speed etc..
2, be not suitable for the fierce variation of environmental condition: simulation test environment needs the regular hour, when user needs fastly
When fast simulated environment changes, the building of experimental enviroment can relative difficulty.
3, some sensors are unsuitable for simulating in laboratory environments: some sensors, due to volume, mounting means, guarantor
Close needs or other reasons, are unsuitable for being simulated in laboratory environments, cause equipment under test discrete function that can not test
It is tested under room environmental.
[utility model content]
The purpose of the utility model is to provide a kind of constant current or constant pressure sensor analog systems, do not need additional proving ring
It border can analog sensor response signal.
The utility model uses following technical scheme: a kind of constant current or constant pressure sensor analog system, including signal occur
Unit, the output end of signal generating unit are connected with signal imitation unit, and signal imitation unit is for realizing sensor signal
Simulation, the output end of signal imitation unit are connected with signal buffer smooth unit, and signal buffer smooth unit is used for adjustment signal
The sensor signal that analogue unit issues in order to the sample circuit of the signal and Devices to test matches, and will be adjusted
Sensor signal is sent to Devices to test；
Signal imitation unit includes digital regulation resistance, the bus interface of digital regulation resistance and the output end of signal generating unit
It is connected, and its output end is connected with the signal input part of signal buffer smooth unit；
Resistance R1 and resistance R2, the other end ground connection of resistance R2, electricity is also respectively connected in the terminal up and down of digital regulation resistance
The other end for hindering R1 is connect with the anode in constant current/constant voltage source, the cathode ground connection in constant current/constant voltage source；
When resistance R1 is connected with constant-current source, the upper terminal of digital regulation resistance and its output end are shorted, digital regulation resistance
Output end be connected to the signal input part of signal buffer smooth unit.
Further, signal buffer smooth unit includes integral buffer amplifier U1 and integrating capacitor C1 in parallel, integral
The negative input of buffer amplifier U1 and one end of integrating capacitor C1 are connect with the output end of digital regulation resistance, integral buffering
The positive input of amplifier U1 is grounded；The other end of integrating capacitor C1 is connected simultaneously with the output end of integral buffer amplifier U1
Analog signal is sent to Devices to test.
Further, the voltage range of sensor analog system output signal is V1~V2, wherein V1For output wire size
Upper voltage limit, and V1=Im* R1, V2For the lower voltage limit of output signal, and V2=Im* R2, ImFor the output electricity in constant current/constant voltage source
Stream.
The beneficial effects of the utility model are: the utility model has abandoned traditional utilization physical sensor, in laboratory
Under environment construct local test environment, come verify equipment under test ability to work method.It is easy to using one-chip computer chip
Programming, digital regulation resistance are ingenious to match convenient for controlling and integrating smooth and load capacity raising of the buffer circuit to output signal
It closes, constitutes Sensor Analog Relay System circuit, provide the sensor signal under true, effective various environmental conditions for equipment under test, with
It is traditional using physical sensor, building local test environment verifies the ability to work of equipment under test in laboratory environments
Method is compared, and the setting of the utility model output signal is simple, clear and free from the influence of the external environment, and a kind of device also can be used
The case where simulating multiple sensors output signal, the parameter that the utility model passes through change signal generator, so that it may Fast simulation
The output signal of actual sensor under difficult environmental conditions, effectively promotion testing efficiency, simulation type is wide, analog sensor
Output signal is either direct current signal, be also possible to alternating signal, modulated signal.
[Detailed description of the invention]
Fig. 1 is the functional block diagram of existing verifying equipment under test；
Fig. 2 is schematic block circuit diagram when the utility model uses constant-current source；
Fig. 3 is schematic block circuit diagram when the utility model uses constant pressure source；
Fig. 4 is a kind of practical application brief principle figure of the utility model.
[specific embodiment]
The utility model is described in detail with reference to the accompanying drawings and detailed description.
The utility model discloses a kind of constant current or constant pressure sensor analog systems, and shown in Fig. 3, including list occurs for signal
Member, general selection signal generator can be made of as signal generating unit general singlechip chip and its peripheral components,
With corresponding firmware in singlechip chip, output is the burst signal of one group of control digital regulation resistance change in resistance,
It is corresponding with to analog sensor signal variation.Signal generator has programmable interface, facilitate according to analog sensor not
Together, different signal waveforms is worked out, different parameters can also be inputted by programmable interface, analog sensor is in varying environment
Under output signal.
It can be provided according to sensor production producer in a piece of chip using single-chip microcontroller as signal source in design circuit
Output parameter, different waveforms, frequency, phase, amplitude be set, realizes that set of device can simulate multiple sensors in difference
Output under environment.
The output end of signal generating unit is connected with signal imitation unit, and signal imitation unit is for realizing sensor signal
Simulation, signal imitation unit includes digital regulation resistance, the bus interface of digital regulation resistance and the output end of signal generating unit
It is connected, and its output end is connected with the signal input part of signal buffer smooth unit.
Resistance R1 and resistance R2, the other end ground connection of resistance R2, electricity is also respectively connected in the terminal up and down of digital regulation resistance
The other end for hindering R1 is connect with the anode in constant current/constant voltage source, the cathode ground connection in constant current/constant voltage source.As shown in Fig. 2, working as resistance R1
When being connected with constant-current source, the upper terminal of digital regulation resistance and its output end are shorted, and the output end of digital regulation resistance is connected to letter
The signal input part of number buffering and smoothing unit.
Signal generator exports the pulse of one group of control digital regulation resistance change in resistance according to the demand to analog sensor
String signal changes the resistance value of digital regulation resistance, makes the voltage corresponding change on digital regulation resistance, realizes digital circuit analog sensed
The target of device output signal.
In the digital regulation resistance using constant-current source, digital regulation resistance is connected by the form of variable resistance, then output signal
For Vs=(Ws+R2) Im, wherein Ws is the resistance value for the variable resistance that digital regulation resistance is constituted, ImFor the defeated of constant-current source or constant pressure source
Electric current out.R1 and R2 is to offset the intrinsic Dead Zone of actual sensor, it is ensured that Vs signal and actual sensor output are special
Property is consistent.The digit of digital regulation resistance can be considered by the required precision to analog sensor.Since actual sensor can not all be kept away
That exempts from should join with dead zone for true, effective analog sensor signal according to the sensor that sensor production producer provides
The resistance value of R1, R2 is arranged in number.The voltage range of sensor analog system output signal is V1~V2, wherein V1To export wire size
Upper voltage limit, and V1=Im* R1, V2For the lower voltage limit of output signal, and V2=Im*R2。
Often internal resistance is higher for the signal source that digital regulation resistance is formed, and is not easy to and tests Circuit Matching, so, signal imitation
The output end of unit is connected with signal buffer smooth unit, and signal buffer smooth unit is issued for adjustment signal analogue unit
Sensor signal in order to which the sample circuit of the signal and Devices to test matches, and the sensor signal adjusted is sent
To Devices to test.
Using digital regulation resistance can be convenient by its resistance value of Digital Circuit Control the characteristics of, realize the mould of sensor signal
It is quasi-.
Digital regulation resistance output signal be it is step-like, for real simulation sensor output signal, using signal buffer
Smooth unit carries out it smoothly, and signal buffer smooth unit includes the integral buffer amplifier U1 and integrating capacitor C1 of parallel connection,
Integral buffer amplifier U1 can be smoothed analog signal, and integrating capacitor C1 is used to filter out the various dry of analog signal
It disturbs.One end of the negative input and integrating capacitor C1 that integrate buffer amplifier U1 is connect with the output end of digital regulation resistance,
Integrate the positive input ground connection of buffer amplifier U1；The other end of integrating capacitor C1 and the output end of integral buffer amplifier U1
It is connected, and analog signal that is smooth and filtering out after interference is sent to Devices to test.
Integral buffer amplifier U1 is the matching in order to facilitate simulation signal generator and test circuit and smooth number potentiometer
The step of output signal, digital regulation resistance output impedance is higher, is not easy to cooperate with the sample circuit of test equipment, therefore uses slow
Device circuit is rushed, the load capacity of VOUT is improved, makes to export VOUT signal and the output signal of actual sensor is consistent.
The working method of a kind of constant current of the utility model or constant pressure sensor analog system are as follows:
Step 1, the desired signal according to Devices to test issue the output parameter of the sensor to analog signal, setting
The input parameter of signal generator, and constant current or constant pressure source are selected, the resistance value of resistance R1 and the resistance value of resistance R2.
Step 2, signal generator generate burst signal according to input parameter, and the bus for being sent to digital regulation resistance connects
Mouthful.
Step 3, digital regulation resistance generate the mould of simultaneously output transducer according to the input signal of bus interface and upper and lower terminal
Quasi- signal, and it is sent to signal buffer smooth unit.
Step 4 is smoothed and is filtered out by analog signal of the signal buffer smooth unit to received sensor
The interference generated in circuit, and analog signal is sent to Devices to test by treated.
The utility model does not need true sensor, does not need additional test bad border, so that it may mention to equipment under test yet
It for sensor analog signals, therefore, is not influenced by environmental change, and the corresponding signal of various kinds of sensors can be simulated, to tested
Equipment is completely tested, and the feasibility of test macro is improved.
As shown in figure 4, being a kind of practical application brief principle figure of the utility model embodiment, by design requirement, simulation
A kind of speed sensor signal.It is driven using 1mA constant-current source, constant-current source open-circuit voltage is 15V, and output signal is to be with 7.5V
The peak-to-peak value of symmetry axis is the sine wave of 10V, centre frequency 1KHz.
U1 is a general single-chip microcontroller, required waveform signal can be previously written in its memory by JZ1 interface,
In chip operational process, user can be changed its waveform parameter, in host computer by JZ2 interface to simulate different
Speed.U1 passes through I2C bus, the running point position for controlling digital regulation resistance are changed by waveform rule, waveform needed for being formed, due to
Digital regulation resistance output is staircase waveform, therefore is filtered using integrator to output waveform in output end, obtains being equivalent to true speed
Spend the waveform of sensor output.
Since maximum changing range is 10V, therefore digital regulation resistance selects 10K resistance value；Since constant-current source open-circuit voltage is
15V, waveform symmetry axis are therefore 7.5V, wave-shape amplitude 10V calculate R1:Similarly, may be used
Calculate R2=2.5K Ω
Since digital regulation resistance absolute error is larger, relative error is smaller, therefore, is desirable to carefully tune in practical application
The resistance value of R1, R2 meets design condition.
Claims (3)
1. a kind of constant current or constant pressure sensor analog system, which is characterized in that including signal generating unit, the signal occurs single
The output end of member is connected with signal imitation unit, simulation of the signal imitation unit for realizing sensor signal, the letter
The output end of number analogue unit is connected with signal buffer smooth unit, and the signal buffer smooth unit is for adjusting the signal
The sensor signal that analogue unit issues in order to the sample circuit of the signal and Devices to test matches, and will be adjusted
Sensor signal is sent to Devices to test；
The signal imitation unit includes digital regulation resistance, the bus interface of the digital regulation resistance and signal generating unit it is defeated
Outlet is connected, and its output end is connected with the signal input part of signal buffer smooth unit；
Resistance R1 and resistance R2, another termination of the resistance R2 is also respectively connected in the terminal up and down of the digital regulation resistance
Ground, the other end of the resistance R1 are connect with the anode in constant current/constant voltage source, the cathode ground connection in the constant current/constant voltage source；
When the resistance R1 is connected with constant-current source, the upper terminal of the digital regulation resistance and its output end are shorted, the number
The output end of word potentiometer is connected to the signal input part of the signal buffer smooth unit.
2. a kind of constant current as described in claim 1 or constant pressure sensor analog system, which is characterized in that the signal buffer is flat
Sliding unit includes integral buffer amplifier U1 and integrating capacitor C1 in parallel, the negative input of the integral buffer amplifier U1
It is connect with the output end of the digital regulation resistance with one end of integrating capacitor C1, the forward direction of the integral buffer amplifier U1 is defeated
Enter end ground connection；The other end of the integrating capacitor C1 is connected with the output end of the integral buffer amplifier U1 and believes simulation
Number it is sent to Devices to test.
3. a kind of constant current as claimed in claim 1 or 2 or constant pressure sensor analog system, which is characterized in that the sensor
The voltage range of simulation system output signal is V1~V2, wherein V1For the upper voltage limit for exporting wire size, and V1=Im* R1, V2For
The lower voltage limit of output signal, and V2=Im* R2, ImFor the output electric current in constant current/constant voltage source.
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| CN201820852175.9U CN208206178U (en) | 2018-06-04 | 2018-06-04 | A kind of constant current or constant pressure sensor analog system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108534819A (en) * | 2018-06-04 | 2018-09-14 | 西安太世德航空电器有限公司 | A kind of constant current or constant pressure sensor analog system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108534819A (en) * | 2018-06-04 | 2018-09-14 | 西安太世德航空电器有限公司 | A kind of constant current or constant pressure sensor analog system and method |
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