CN103634008B - Multi-channel signal collecting device and collecting method - Google Patents
Multi-channel signal collecting device and collecting method Download PDFInfo
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- CN103634008B CN103634008B CN201310620330.6A CN201310620330A CN103634008B CN 103634008 B CN103634008 B CN 103634008B CN 201310620330 A CN201310620330 A CN 201310620330A CN 103634008 B CN103634008 B CN 103634008B
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Abstract
The invention provides a multi-channel signal collecting device and a multi-channel signal collecting method; the multi-channel signal collecting device comprises a configuration network, an analog switch, an A/D (analog/digital) converter and an impedance matching and amplitude limiting circuit; one end of the analog switch is connected with the configuration network; the other end of the analog switch is connected with one end of the impedance matching and amplitude limiting circuit of which the other end is connected with the A/D converter. The multi-channel signal collecting device and the multi-channel signal collecting method have the beneficial effects that an analog signal and a digital signal are collected and integrated in one circuit, the configuration of each signal is very simple, only a reference voltage value and a resistor value need to be adjusted, the collecting circuit is universal, and when the type or the amplitude value of an input signal are changed, a PCB (printed circuit board) circuit dose not need to be changed; the collecting circuit is simple in structure, the PCB circuit is easy to design, and the multi-channel signal collecting device and the multi-channel signal collecting method can be applied in a non-isolation data collecting system with lower demand on real-time performance and more complex signals.
Description
Technical field
The present invention relates to Acquisition Circuit, more particularly, to multi-channel signal acquiring device and acquisition method.
Background technology
Collection of simulant signal and digital switch quantity collection are typically separated by traditional signal acquisition circuit, and analog signal is passed through
Operational amplification circuit carries out signal condition and becomes the analog signal of standard delivering to A/D converter；As Fig. 1, analog input signal
Ain1, Ain2, Ain3 ... AinN adjusts respectively through signal conditioning circuit 1, signal conditioning circuit 2, signal conditioning circuit 3 ... signal
Reason circuit N is converted into standard analog signal, then through analog switch, gives A/D converter and carry out analog-to-digital conversion.Digital switch quantity is believed
Number TTL or CMOS level signal becoming standard through signal condition is delivered to digit buffer and is carried out digital collection.As Fig. 2, open
Pass amount input signal Din1, Din2, Din3 ... DinN are through signal conditioning circuit 1, signal conditioning circuit 2, signal conditioning circuit
3 ... signal conditioning circuit N enter digit buffer after being converted into standardized digital signal, and switching value must be adjusted by signal conditioning circuit
The digital signal level of the standard of managing into.For different types of analog input signal, carry out signal with different computing circuits
Conditioning, needs more operational amplification circuit；Different input switch amount signal conditioning circuits is also different, and signal condition
The on-off model of input must be nursed one's health into the level signal of standard by circuit, and circuit is more complicated.When input signal types or
When range of signal changes, circuit structure must change, and PCB also will redesign.
Content of the invention
In order to solve the problems of the prior art, the invention provides a kind of multi-channel signal acquiring device.
The invention provides a kind of multi-channel signal acquiring device, including Configuration network, analog switch, A/D converter, resistance
Anti- coupling and amplitude limiter circuit, described analog switch one end is connected with described Configuration network, the described analog switch other end with described
Impedance matching is connected with amplitude limiter circuit one end；Described impedance matching is connected with described A/D converter with the amplitude limiter circuit other end.
As a further improvement on the present invention, described Configuration network includes adjustable reference unit, first resistor, the second electricity
Resistance, 3rd resistor, the 4th resistance and the first electric capacity, described first resistor one end is connected with input signal, and described first resistor is another
One end is connected with 3rd resistor and the 4th resistance respectively, and described second resistance one end is connected with adjustable reference unit, and described second
The resistance other end is connected with the 4th resistance, the first electric capacity and output signal respectively, described 3rd resistor one end and working power ground
It is connected, the described 3rd resistor other end is connected with first resistor and the 4th resistance respectively, described first electric capacity one end is electric with work
Source it is connected, the described first electric capacity other end is connected with second resistance, the 4th resistance and output signal respectively.
As a further improvement on the present invention, described impedance matching and amplitude limiter circuit include the first operational amplifier, first
Diode and the second diode, the positive input terminal of described first operational amplifier is connected with input signal, and described first computing is put
Big device negative input end is believed with the first operational amplifier output terminal, the first diode cathode, the second diode cathode and output respectively
Number it is connected, described first diode cathode is connected with working power, is connected to described second diode cathode and working power.
As a further improvement on the present invention, described Configuration network is multiple.
The invention provides a kind of acquisition method using described multi-channel signal acquiring device, in Configuration network,
When input signal is for bipolar voltage signal and negative voltage signal, 3rd resistor disconnects, and input analog voltage signal is first
Carry out voltage distribution with the output voltage of described adjustable reference unit, regulation can in resistance R1, the 4th resistance R4 and second resistance
Adjust the output voltage of reference cell and the value of first resistor, the 4th resistance and second resistance, output signal can be adjusted.
The invention provides a kind of acquisition method using described multi-channel signal acquiring device, in Configuration network,
When input signal is for positive voltage signal, second resistance R2 disconnects, and input voltage signal is in first resistor R1 and 3rd resistor R3
Carry out partial pressure, adjust the value of first resistor and 3rd resistor, output signal can be adjusted.
The invention provides a kind of acquisition method using described multi-channel signal acquiring device, in Configuration network,
When input signal is for bipolar current signal or negative current signal, input current signal is through shape when first resistor and 3rd resistor
Become voltage signal, carry out partial pressure through first resistor and 3rd resistor, produce bipolarity or negative voltage signal, adjust adjustable reference
Unit output voltage and the value of first resistor, 3rd resistor, the 4th resistance and second resistance, can adjust output signal.
The invention provides a kind of acquisition method using described multi-channel signal acquiring device, in Configuration network,
When input signal is for positive current signal, disconnects second resistance, formed when input current signal is through first resistor and 3rd resistor
Voltage signal, carries out partial pressure through first resistor and 3rd resistor, produces positive voltage signal, adjust first resistor, 3rd resistor,
4th resistance and the value of second resistance, can adjust output signal.
The invention provides a kind of acquisition method using described multi-channel signal acquiring device, in Configuration network,
When input signal is for switching value output signal, disconnect 3rd resistor, first resistor and the 4th resistance sum are less than second resistance,
When switching value output signal, output signal=0V, the otherwise output voltage values of output signal=adjustable reference unit.
The invention provides a kind of acquisition method using described multi-channel signal acquiring device, in Configuration network,
In Configuration network, when input signal is for switching value dry contact signal, disconnect 3rd resistor, first resistor and the 4th resistance resistance
Value sum is less than second resistance R2 resistance, when dry contact closes, output signal=0V, and otherwise output signal=adjustable reference unit
Output voltage values.
The invention has the beneficial effects as follows：In the present invention, analog signal, digital signal acquiring are concentrated on a kind of circuit
In, the configuration of each signal is very simple, and only with adjusting reference voltage and adjustment resistance value, Acquisition Circuit can be general, when defeated
When entering signal type or amplitude change, without change PCB circuit；When gathering on-off model, when input signal amplitude change
When scope is larger, signal conditioning circuit is not required to accurately nurse one's health into fiduciary level signal, the signals collecting value that A/D is changed with pre-
If threshold values be compared it is possible to judge the state of switching value.Separately multiple signals unify impedance matching it is not necessary to a lot
Operational amplification circuit.Acquisition Circuit structure of the present invention is simple, and PCB circuit design is easy.Can in non-isolated, requirement of real-time not
Apply in the data collecting system high, signal is more complicated.
Brief description
Fig. 1 is the analogue signal acquisition circuit figure of background technology.
Fig. 2 is the on-off model Acquisition Circuit figure of background technology.
Fig. 3 is the multi-channel signal acquiring principle of device schematic diagram of the present invention.
Fig. 4 is the Configuration network circuit diagram of the present invention.
Fig. 5 is impedance matching and the amplitude limiter circuit schematic diagram of the present invention.
Specific embodiment
As shown in figure 3, the invention discloses a kind of multi-channel signal acquiring device, including Configuration network 10, analog switch
20th, A/D converter 40, impedance matching and amplitude limiter circuit 30, described analog switch 20 one end is connected with described Configuration network 10, institute
State analog switch 20 other end to be connected with described impedance matching and amplitude limiter circuit 30 one end；Described impedance matching and amplitude limiter circuit 30
The other end is connected with described A/D converter 40.
As shown in figure 4, described Configuration network 10 include adjustable reference unit 101, first resistor R1, second resistance R2,
Three resistance R3, the 4th resistance R4 and the first electric capacity C1, described first resistor R1 one end is connected with input signal Ai, described first electricity
The resistance R1 other end is connected with 3rd resistor R3 and the 4th resistance R4 respectively, described second resistance R2 one end and adjustable reference unit
101 are connected, and the described second resistance R2 other end is connected with the 4th resistance R4, the first electric capacity C1 and output signal A0 respectively, described
Be connected to 3rd resistor R3 one end and working power, the described 3rd resistor R3 other end respectively with first resistor R1 and the 4th resistance
R4 is connected, and is connected to described first electric capacity C1 one end and working power, the described first electric capacity C1 other end respectively with second resistance
R2, the 4th resistance R4 are connected with output signal A0.
As shown in figure 5, described impedance matching and amplitude limiter circuit 30 include the first operational amplifier 301, the first diode V1
With the second diode V2, the positive input terminal of described first operational amplifier 301 is connected with input signal, described first operation amplifier
Device 301 negative input end respectively with the first operational amplifier 301 output end, the first diode V1 positive pole, the second diode V2 negative pole
It is connected with output signal, described first diode V1 negative pole is connected with working power, described second diode V2 positive pole and work
It is connected power supply.
Described Configuration network 10 is multiple.
The invention also discloses a kind of acquisition method using described multi-channel signal acquiring device, according to input signal
Difference, the adjustment resistance of Configuration network 10 and the adjustable reference of regulating allocation network 10, carry out signal condition.Of the present invention adopt
Collector can gather different voltage and current signals, and the analog signalses that can gather have：Bipolar voltage signal, negative electricity
Pressure signal, positive voltage signal, bipolar current signal, negative current signal and positive current signal；The on-off model that can gather
Have：Dry contact signal, OC door output signal, voltage signal and current signal.
Difference according to input signal carries out calculating configuration, converts input signals into the voltage signal being suitable for collection, by
It is to produce through electric resistance partial pressure in this voltage signal, the output signal output impedance of Configuration network 10 is different, directly carries out A/D
Conversion can produce larger error, the output signal of Configuration network 10 by after analog switch 20 through being made up of operational amplifier
Follower carry out impedance matching, be re-fed into A/D converter 40.Amplitude limiter circuit is to prevent from damaging, simulating in front-end circuit
In switching channels handoff procedure, voltage exceeds operating voltage range and damages A/D converter 40.
In the present invention, input signal Ain1, Ain2, Ain3 ... AinN, A/D conversion reference voltage Vref and channel selecting
Control signal SLOT [1:N].
Described adjustable reference unit 101 is made up of adjustable reference circuit, by adjusting first resistor R1, second resistance
R2, the output voltage values Vadj of 3rd resistor R3, the 4th resistance R4 and adjustable reference unit 101, can make Acquisition Circuit be suitable for
In different input signals.First electric capacity C1 is used for signal filtering.
In Configuration network 10, when input signal Ai is bipolar voltage signal and negative voltage signal, 3rd resistor R3
Disconnect, input analog voltage signal Ai in first resistor R1, the 4th resistance R4 and second resistance R2 with adjustable reference unit 101
Output voltage Vadj carry out voltage distribution, adjust output voltage Vadj and first resistor R1, the 4th resistance R4 of adjustable reference
With the value of second resistance R2, adjustable output signal A0, make output signal A0 in normal acquisition range of signal.
In Configuration network 10, when input signal Ai is positive voltage signal, second resistance R2 disconnects, input voltage signal
Ai carries out partial pressure in first resistor R1 and 3rd resistor R3, adjusts the value of first resistor R1 and 3rd resistor R3, can adjust output
Signal A0, makes output signal A0 in normal acquisition range of signal.
In Configuration network 10, when input signal Ai is bipolar current signal or negative current signal, input current is believed
Number Ai, through forming voltage signal when first resistor R1 and 3rd resistor R3, is carried out point through first resistor R1 and 3rd resistor R3
Pressure, produces bipolarity or negative voltage signal, adjust the output voltage Vadj of adjustable reference and first resistor R1,3rd resistor R3,
4th resistance R4 and the value of second resistance R2, adjustable output signal A0, make output signal A0 in normal acquisition range of signal.
In Configuration network 10, when input signal Ai is positive current signal, disconnect second resistance R2, input current signal
Ai, through forming voltage signal when first resistor R1 and 3rd resistor R3, carries out partial pressure through first resistor R1 and 3rd resistor R3,
Produce positive voltage signal, adjust first resistor R1, the value of 3rd resistor R3, the 4th resistance R4 and second resistance R2, can adjust defeated
Go out signal A0, make output signal A0 in normal acquisition range of signal.
In Configuration network 10, when input signal Ai is switching value OC output signal, disconnect 3rd resistor R3, the first electricity
Resistance R1 and the 4th resistance R4 sum are far smaller than second resistance R2, when OC output signal, Ao=0V, otherwise Ao=Vadj.
In Configuration network 10, when input signal Ai is switching value dry contact signal, disconnect 3rd resistor R3, the first electricity
Resistance R1 and the 4th resistance R4 resistance sum are far smaller than second resistance R2 resistance, when dry contact closes, Ao=0V, otherwise Ao=
Vadj.
, through different signal conditions in Configuration network 10, its output is believed for input signal Ain1, Ain2, Ain3 ... AinN
The output impedance of number A0 is also different, if directly carrying out A/D conversion, because impedance mismatch can affect sampling precision；In addition because dry
Disturb or other reasonses cause the output signal of matching network 10 too high or too low, A/D converter can be damaged, the present invention is using simulation
Multi channel signals are passed through multiselect one switch and are sent to impedance matching and amplitude limiter circuit 30, through impedance matching and amplitude limit by switch 20
Deliver to A/D converter 40 it is ensured that A/D sampling precision and the protection to A/D converter.
In the present invention, by configuring the magnitude of voltage of the resistance value in described regulating allocation network 10 and adjustment adjustable reference
Realize signal condition, realize versatility between collection of simulant signal and on-off model collection for the signal conditioning circuit.Collection
On-off model excursion can be very big.
In the present invention, analog signal, digital signal acquiring are concentrated in a kind of circuit, the configuration of each signal is very
Simply, only with adjusting reference voltage and adjustment resistance value, Acquisition Circuit can be general, when input signal types or amplitude change
When, without change PCB circuit；When gathering on-off model, when input signal amplitude excursion is larger, signal condition electricity
Road is not required to accurately nurse one's health into fiduciary level signal, the signals collecting value that A/D is changed and default threshold values be compared so that it may
To judge the state of switching value.Separately multiple signals unify impedance matching it is not necessary to a lot of operational amplification circuit.The present invention adopts
Current collection line structure is simple, and PCB circuit design is easy.Can be in non-isolated, requirement of real-time is not high, signal is more complicated data
Apply in acquisition system.
The present invention adopts a kind of general multi-channel signal acquiring circuit, by adjusting resistance and regulation in Configuration network
Reference voltage, can take into account the multichannel electric current of sampling and voltage signal, the signal of any passage input both can be simulation letter
Number may also be digital switch quantity signal, by flexible configuration, same PCB realize different types of signals collecting,
Furthermore with A/D converter sampling switch amount signal, switch amount signal amplitude is less demanding, and signal conditioning circuit is also very simple
Single, on-off model strong interference immunity, preferably solve problems of the prior art.
Above content is to further describe it is impossible to assert with reference to specific preferred embodiment is made for the present invention
Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of present inventive concept, some simple deduction or replace can also be made, all should be considered as belonging to the present invention's
Protection domain.
Claims (9)
1. a kind of multi-channel signal acquiring device it is characterised in that：Including Configuration network, analog switch, A/D converter, impedance
Coupling and amplitude limiter circuit, described analog switch one end is connected with described Configuration network, the described analog switch other end and described resistance
Anti- coupling is connected with amplitude limiter circuit one end；Described impedance matching is connected with described A/D converter with the amplitude limiter circuit other end；Described
Configuration network includes adjustable reference unit, first resistor, second resistance, 3rd resistor, the 4th resistance and the first electric capacity, and described
One resistance one end is connected with input signal, and the described first resistor other end is connected with 3rd resistor and the 4th resistance respectively, described
Second resistance one end is connected with adjustable reference unit, the described second resistance other end respectively with the 4th resistance, the first electric capacity and defeated
Go out signal to be connected, be connected to described 3rd resistor one end and working power, the described 3rd resistor other end respectively with first resistor
It is connected with the 4th resistance, is connected to described first electric capacity one end and working power, the described first electric capacity other end is respectively with second
Resistance, the 4th resistance are connected with output signal.
2. multi-channel signal acquiring device according to claim 1 it is characterised in that：Described impedance matching and amplitude limiter circuit
Including the first operational amplifier, the first diode and the second diode, the positive input terminal of described first operational amplifier and input
Signal be connected, described first operational amplifier negative input end respectively with the first operational amplifier output terminal, the first diode cathode,
Second diode cathode is connected with output signal, and described first diode cathode is connected with working power, described second diode
Positive pole and working power it is connected.
3. multi-channel signal acquiring device according to claim 1 it is characterised in that：Described Configuration network is multiple.
4. usage right require 2 to 3 any one described in multi-channel signal acquiring device acquisition method it is characterised in that
In Configuration network, when input signal is for bipolar voltage signal and negative voltage signal, 3rd resistor disconnects, input analog voltage
Signal carries out voltage distribution with the output voltage of described adjustable reference unit in first resistor, the 4th resistance and second resistance,
Adjust the output voltage of adjustable reference unit and the value of first resistor, the 4th resistance and second resistance, output signal can be adjusted.
5. usage right require 2 to 3 any one described in multi-channel signal acquiring device acquisition method it is characterised in that
In Configuration network, when input signal is for positive voltage signal, second resistance disconnects, and input voltage signal is in first resistor and the 3rd
Resistance carries out partial pressure, adjusts the value of first resistor and 3rd resistor, can adjust output signal.
6. usage right require 2 to 3 any one described in multi-channel signal acquiring device acquisition method it is characterised in that
In Configuration network, when input signal is for bipolar current signal or negative current signal, input current signal through first resistor and
Form voltage signal during 3rd resistor, carry out partial pressure through first resistor and 3rd resistor, produce bipolarity or negative voltage signal,
Adjust the value of adjustable reference unit output voltage and first resistor, 3rd resistor, the 4th resistance and second resistance, can adjust defeated
Go out signal.
7. usage right require 2 to 3 any one described in multi-channel signal acquiring device acquisition method it is characterised in that
In Configuration network, when input signal is for positive current signal, disconnect second resistance, input current signal is through first resistor and the 3rd
Form voltage signal during resistance, carry out partial pressure through first resistor and 3rd resistor, produce positive voltage signal, adjust the first electricity
Resistance, the value of 3rd resistor, the 4th resistance and second resistance, can adjust output signal.
8. usage right require 2 to 3 any one described in multi-channel signal acquiring device acquisition method it is characterised in that
In Configuration network, when input signal is for switching value output signal, disconnect 3rd resistor, first resistor and the 4th resistance sum are little
In second resistance, when switching value output signal, output signal=0V, the otherwise output voltage of output signal=adjustable reference unit
Value.
9. usage right require 2 to 3 any one described in multi-channel signal acquiring device acquisition method it is characterised in that
In Configuration network, when input signal is for switching value dry contact signal, disconnect 3rd resistor, first resistor and the 4th resistance
Sum is less than second resistance resistance, when dry contact closes, output signal=0V, and otherwise output signal=adjustable reference unit is defeated
Go out magnitude of voltage.
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| CN104267640B (en) * | 2014-09-23 | 2017-09-01 | 中国北方车辆研究所 | A kind of general Acquisition Circuit of analog signal |
| CN105526952A (en) * | 2014-09-28 | 2016-04-27 | 沈阳中科奥维科技股份有限公司 | Low-power wireless meter realizing device and realizing method |
| CN104460462B (en) * | 2014-12-13 | 2017-07-07 | 华北电力大学 | A kind of compatible with single bipolar analog signal sample circuit |
| CN104698967B (en) * | 2015-02-10 | 2019-04-05 | 上海鲍麦克斯电子科技有限公司 | A kind of electronic control simulation amount input system and its input method |
| CN104852737A (en) * | 2015-04-29 | 2015-08-19 | 苏州固基电子科技有限公司 | 4-channel low-distortion analog-to-digital conversion driving device |
| CN106468897B (en) * | 2015-08-21 | 2021-01-12 | 博世力士乐(西安)电子传动与控制有限公司 | Interface device and processing system |
| CN105281770B (en) * | 2015-10-26 | 2018-06-19 | 云顶科技（江苏）有限公司 | A kind of analog signal processing circuit |
| CN106020074A (en) * | 2016-08-04 | 2016-10-12 | 北京安控科技股份有限公司 | One-valuing one-adding diagnosis functional safety analog input circuit |
| CN107942118A (en) * | 2017-11-13 | 2018-04-20 | 国家电网公司 | A kind of multrirange collecting unit, Medium Voltage Switchgear signal pickup assembly and system |
| CN108414823A (en) * | 2018-01-25 | 2018-08-17 | 深圳市简测智能技术有限公司 | A kind of synchronous and synchronous collection method |
| CN108535536B (en) * | 2018-05-02 | 2023-08-25 | 湖南中车时代通信信号有限公司 | Train working condition voltage acquisition circuit and method for full-time self-detection |
| CN109471012B (en) * | 2018-10-23 | 2021-10-08 | 浙江慧控科技有限公司 | Input signal detection circuit and method in universal input circuit |
| CN110442182A (en) * | 2019-08-15 | 2019-11-12 | 惠州汇能精电科技有限公司 | A kind of control method of conditioning circuit and conditioning circuit |
| CN114217564A (en) * | 2022-02-23 | 2022-03-22 | 中国电子科技集团公司第二十八研究所 | Multifunctional GSM reconnaissance monitoring system |
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