CN103634008A - Multi-channel signal collecting device and collecting method - Google Patents
Multi-channel signal collecting device and collecting method Download PDFInfo
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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, relate in particular to multi-channel signal acquiring device and acquisition method.
Background technology
Traditional signal acquisition circuit generally by collection of simulant signal and digital switch quantity collection separately, carry out through operational amplification circuit the analog signal that signal condition becomes standard and deliver to A/D converter by analog signal; As Fig. 1, analog input signal Ain1, Ain2, Ain3 ... AinN passes through respectively signal conditioning circuit 1, signal conditioning circuit 2, signal conditioning circuit 3 ... signal conditioning circuit N converts standard analog signal to, through analog switch, give A/D converter and carry out analog-to-digital conversion again.Digital switch quantity signal becomes the TTL of standard or CMOS level signal through signal condition and delivers to digit buffer and carry out digital collection.As Fig. 2, switching value input signal Din1, Din2, Din3 ... DinN is through signal conditioning circuit 1, signal conditioning circuit 2, signal conditioning circuit 3 ... signal conditioning circuit N enters digit buffer after converting standardized digital signal to, and signal conditioning circuit must be nursed one's health into switching value the digital signal level of standard.For dissimilar analog input signal, carry out signal condition with different computing circuits, need more operational amplification circuit; Different input switch amount signal conditioning circuits is also different, and signal conditioning circuit must become the switching value signal condition of input the level signal of standard, circuit more complicated.When input signal types or range of signal change, circuit structure must change, and PCB also will redesign.
Summary 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, comprise configuration network, analog switch, A/D converter, impedance matching and amplitude limiter circuit, described analog switch one end is connected with described configuration network, and the described analog switch other end is connected with amplitude limiter circuit one end with described impedance matching; 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 comprises adjustable reference unit, the first resistance, the second resistance, the 3rd resistance, the 4th resistance and the first electric capacity, described first resistance one end is connected with input signal, the described first resistance other end is connected with the 4th resistance with the 3rd 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 is connected with output signal, be connected to described the 3rd resistance one end and working power, described the 3rd resistance other end is connected with the 4th resistance with the first resistance respectively, be connected to described first electric capacity one end and working power, the described first electric capacity other end respectively with the second resistance, the 4th resistance is connected with output signal.
As a further improvement on the present invention, described impedance matching and amplitude limiter circuit comprise the first operational amplifier, the first diode and the second diode, the positive input terminal of described the first operational amplifier is connected with input signal, described the first operational amplifier negative input end is connected with output signal with the first operational amplifier output terminal, the first diode cathode, the second diode cathode respectively, described the first diode cathode is connected with working power, is connected to described the second diode cathode and working power.
As a further improvement on the present invention, described configuration network is a plurality of.
The invention provides a kind of acquisition method that uses described multi-channel signal acquiring device, in configuration network, when input signal is bipolar voltage signal and negative voltage signal, the 3rd resistance disconnects, input analog voltage signal carries out voltage distribution with the output voltage of described adjustable reference unit on the first resistance R 1, the 4th resistance R 4 and the second resistance, regulate the output voltage of adjustable reference unit and the value of the first resistance, the 4th resistance and the second resistance, can adjust output signal.
The invention provides a kind of acquisition method that uses described multi-channel signal acquiring device, in configuration network, when input signal is positive voltage signal, the second resistance R 2 disconnects, input voltage signal carries out dividing potential drop in the first resistance R 1 and the 3rd resistance R 3, regulate the value of the first resistance and the 3rd resistance, can adjust output signal.
The invention provides a kind of acquisition method that uses described multi-channel signal acquiring device, in configuration network, when input signal is bipolar current signal or negative current signal, input current signal forms voltage signal when the first resistance and the 3rd resistance, through the first resistance and the 3rd resistance, carry out dividing potential drop, produce bipolarity or negative voltage signal, regulate the value of adjustable reference unit output voltage and the first resistance, the 3rd resistance, the 4th resistance and the second resistance, can adjust output signal.
The invention provides a kind of acquisition method that uses described multi-channel signal acquiring device, in configuration network, when input signal is positive current signal, disconnect the second resistance, input current signal forms voltage signal when the first resistance and the 3rd resistance, through the first resistance and the 3rd resistance, carries out dividing potential drop, produces positive voltage signal, regulate the value of the first resistance, the 3rd resistance, the 4th resistance and the second resistance, can adjust output signal.
The invention provides a kind of acquisition method that uses described multi-channel signal acquiring device, in configuration network, when input signal is switching value output signal, disconnect the 3rd resistance, the first resistance and the 4th resistance sum are less than the second resistance, when switching value output signal, output signal=0V, otherwise the output voltage values of output signal=adjustable reference unit.
The invention provides a kind of acquisition method that uses described multi-channel signal acquiring device, in configuration network, in configuration network, when input signal is switching value dry contact signal, disconnect the 3rd resistance, the first resistance and the 4th resistance sum are less than the second resistance R 2 resistances, when dry contact is closed, output signal=0V, otherwise the output voltage values of output signal=adjustable reference unit.
The invention has the beneficial effects as follows: in the present invention, analog signal, digital signal acquiring are concentrated in a kind of circuit, the configuration of each signal is very simple, only with regulating reference voltage and adjusting resistance value, Acquisition Circuit can be general, when input signal types or amplitude change, need not change PCB circuit; When gathering switching value signal, when input signal amplitude excursion is larger, signal conditioning circuit does not need to nurse one's health into accurately fiduciary level signal, and the signals collecting value of A/D conversion and default threshold values are compared, and just can judge the state of switching value.Another a plurality of signal is unified impedance matching, does not need a lot of operational amplification circuits.Acquisition Circuit of the present invention is simple in structure, and PCB circuit design is easy.Can be not high at non-isolation, requirement of real-time, apply in the data acquisition system of signal more complicated.
Accompanying drawing explanation
Fig. 1 is the analogue signal acquisition circuit figure of background technology.
Fig. 2 is the switching value signal acquisition circuit figure of background technology.
Fig. 3 is multi-channel signal acquiring principle of device schematic diagram of the present invention.
Fig. 4 is configuration network circuit diagram of the present invention.
Fig. 5 is impedance matching of the present invention and amplitude limiter circuit schematic diagram.
Embodiment
As shown in Figure 3, the invention discloses a kind of multi-channel signal acquiring device, comprise configuration network 10, analog switch 20, A/D converter 40, impedance matching and amplitude limiter circuit 30, described analog switch 20 one end are connected with described configuration network 10, and described analog switch 20 other ends are connected with amplitude limiter circuit 30 one end with described impedance matching; Described impedance matching is connected with described A/D converter 40 with amplitude limiter circuit 30 other ends.
As shown in Figure 4, described configuration network 10 comprises adjustable reference unit 101, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the first capacitor C 1, described first resistance R 1 one end is connected with input signal Ai, described first resistance R 1 other end is connected with the 4th resistance R 4 with the 3rd resistance R 3 respectively, described second resistance R 2 one end are connected with adjustable reference unit 101, described second resistance R 2 other ends respectively with the 4th resistance R 4, the first capacitor C 1 is connected with output signal A0, be connected to described the 3rd resistance R 3 one end and working power, described the 3rd resistance R 3 other ends are connected with the 4th resistance R 4 with the first resistance R 1 respectively, be connected to described first capacitor C 1 one end and working power, described first capacitor C 1 other end respectively with the second resistance R 2, the 4th resistance R 4 is connected with output signal A0.
As shown in Figure 5, described impedance matching and amplitude limiter circuit 30 comprise the first operational amplifier 301, the first diode V1 and the second diode V2, the positive input terminal of described the first operational amplifier 301 is connected with input signal, described the first operational amplifier 301 negative input ends are connected with output signal with the first operational amplifier 301 outputs, the first diode V1 positive pole, the second diode V2 negative pole respectively, described the first diode V1 negative pole is connected with working power, is connected to described the second diode V2 positive pole and working power.
Described configuration network 10 is a plurality of.
The invention also discloses a kind of acquisition method that uses described multi-channel signal acquiring device, according to the difference of input signal, adjust the resistance of configuration network 10 and the adjustable reference of regulating allocation network 10, carry out signal condition.Acquisition Circuit of the present invention can gather different voltage and current signals, and the analog signals that can gather has: bipolar voltage signal, negative voltage signal, positive voltage signal, bipolar current signal, negative current signal and positive current signal; The switching value signal that can gather has: dry contact signal, OC door output signal, voltage signal and current signal.
According to the difference of input signal, calculate configuration, input signal is converted to the voltage signal that is applicable to collection, because this voltage signal produces through electric resistance partial pressure, the output signal output impedance of configuration network 10 is different, directly carry out A/D conversion and can produce larger error, the output signal of configuration network 10 is carried out impedance matching through the follower being comprised of operational amplifier after by analog switch 20, then sends into A/D converter 40.Amplitude limiter circuit is in order to prevent that voltage exceeds operating voltage range and damages A/D converter 40 in front-end circuit damage, analog switch passage handoff procedure.
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 by adjustable reference the electric circuit constitute, by adjusting the output voltage values Vadj of the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and adjustable reference unit 101, can make Acquisition Circuit be applicable to different input signals.The first capacitor C 1 is for signal filtering.
In configuration network 10, when input signal Ai is bipolar voltage signal and negative voltage signal, the 3rd resistance R 3 disconnects, input analog voltage signal Ai carries out voltage distribution with the output voltage V adj of adjustable reference unit 101 in the first resistance R 1, the 4th resistance R 4 and the second resistance R 2, regulate the output voltage V adj of adjustable reference and the value of the first resistance R 1, the 4th resistance R 4 and the second resistance R 2, capable of regulating output signal A0, makes output signal A0 within the scope of normal collection signal.
In configuration network 10, when input signal Ai is positive voltage signal, the second resistance R 2 disconnects, input voltage signal Ai carries out dividing potential drop in the first resistance R 1 and the 3rd resistance R 3, regulate the value of the first resistance R 1 and the 3rd resistance R 3, capable of regulating output signal A0, makes output signal A0 within the scope of normal collection signal.
In configuration network 10, when input signal Ai is bipolar current signal or negative current signal, input current signal Ai forms voltage signal when the first resistance R 1 and the 3rd resistance R 3, through the first resistance R 1 and the 3rd resistance R 3, carry out dividing potential drop, produce bipolarity or negative voltage signal, regulate the output voltage V adj of adjustable reference and the value of the first resistance R 1, the 3rd resistance R 3, the 4th resistance R 4 and the second resistance R 2, capable of regulating output signal A0, makes output signal A0 within the scope of normal collection signal.
In configuration network 10, when input signal Ai is positive current signal, disconnect the second resistance R 2, input current signal Ai forms voltage signal when the first resistance R 1 and the 3rd resistance R 3, through the first resistance R 1 and the 3rd resistance R 3, carry out dividing potential drop, produce positive voltage signal, regulate the value of the first resistance R 1, the 3rd resistance R 3, the 4th resistance R 4 and the second resistance R 2, capable of regulating output signal A0, makes output signal A0 within the scope of normal collection signal.
In configuration network 10, when input signal Ai is switching value OC output signal, disconnects the 3rd resistance R 3, the first resistance R 1 and the 4th resistance R 4 sums and be far smaller than the second resistance R 2, when OC output signal, Ao=0V, otherwise Ao=Vadj.
In configuration network 10, when input signal Ai is switching value dry contact signal, disconnect the 3rd resistance R 3, the first resistance R 1 and the 4th resistance R 4 resistance sums are far smaller than the second resistance R 2 resistances, when dry contact is closed, Ao=0V, otherwise Ao=Vadj.
Input signal Ain1, Ain2, Ain3 ... AinN is through different signal conditions in configuration network 10, and the output impedance of its output signal A0 is also different, if directly carry out A/D conversion, because impedance mismatch can affect sampling precision; In addition because disturbing or other reasons causes the output signal of matching network 10 too high or too low; can damage A/D converter; the present invention adopts analog switch 20 that multi channel signals is sent to impedance matching and amplitude limiter circuit 30 by multiselect one switch; through impedance matching and amplitude limit, deliver to A/D converter 40, guaranteed A/D sampling precision and the protection to A/D converter.
In the present invention, by the resistance value configuring in described regulating allocation network 10, realize signal condition with the magnitude of voltage of adjusting adjustable reference, realize the versatility of signal conditioning circuit between collection of simulant signal and switching value signals collecting.The switching value signal excursion gathering can be very large.
In the present invention, analog signal, digital signal acquiring are concentrated in a kind of circuit, the configuration of each signal is very simple, only with regulating reference voltage and adjusting resistance value, Acquisition Circuit can be general, when input signal types or amplitude change, need not change PCB circuit; When gathering switching value signal, when input signal amplitude excursion is larger, signal conditioning circuit does not need to nurse one's health into accurately fiduciary level signal, and the signals collecting value of A/D conversion and default threshold values are compared, and just can judge the state of switching value.Another a plurality of signal is unified impedance matching, does not need a lot of operational amplification circuits.Acquisition Circuit of the present invention is simple in structure, and PCB circuit design is easy.Can be not high at non-isolation, requirement of real-time, apply in the data acquisition system of signal more complicated.
The present invention adopts a kind of general multi-channel signal acquiring circuit, by adjusting the resistance in configuration network and regulating reference voltage, can take into account the multichannel electric current of sampling and voltage signal, the signal of any passage input can be both also digital switch quantity signal of analog signal, pass through flexible configuration, on same PCB circuit board, realize dissimilar signals collecting, utilize in addition A/D converter sampling switch amount signal, switch amount signal amplitude is less demanding, signal conditioning circuit is also very simple, switching value signal strong interference immunity, problems of the prior art have been solved preferably.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a multi-channel signal acquiring device, it is characterized in that: comprise configuration network, analog switch, A/D converter, impedance matching and amplitude limiter circuit, described analog switch one end is connected with described configuration network, and the described analog switch other end is connected with amplitude limiter circuit one end with described impedance matching; Described impedance matching is connected with described A/D converter with the amplitude limiter circuit other end.
2. multi-channel signal acquiring device according to claim 1, it is characterized in that: described configuration network comprises adjustable reference unit, the first resistance, the second resistance, the 3rd resistance, the 4th resistance and the first electric capacity, described first resistance one end is connected with input signal, the described first resistance other end is connected with the 4th resistance with the 3rd 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 is connected with output signal, be connected to described the 3rd resistance one end and working power, described the 3rd resistance other end is connected with the 4th resistance with the first resistance respectively, be connected to described first electric capacity one end and working power, the described first electric capacity other end respectively with the second resistance, the 4th resistance is connected with output signal.
3. multi-channel signal acquiring device according to claim 1, it is characterized in that: described impedance matching and amplitude limiter circuit comprise the first operational amplifier, the first diode and the second diode, the positive input terminal of described the first operational amplifier is connected with input signal, described the first operational amplifier negative input end is connected with output signal with the first operational amplifier output terminal, the first diode cathode, the second diode cathode respectively, described the first diode cathode is connected with working power, is connected to described the second diode cathode and working power.
4. multi-channel signal acquiring device according to claim 1, is characterized in that: described configuration network is a plurality of.
5. right to use requires the acquisition method of the multi-channel signal acquiring device described in 2 to 4 any one, it is characterized in that, in configuration network, when input signal is bipolar voltage signal and negative voltage signal, the 3rd resistance disconnects, input analog voltage signal carries out voltage distribution with the output voltage of described adjustable reference unit on the first resistance R 1, the 4th resistance R 4 and the second resistance, regulate the output voltage of adjustable reference unit and the value of the first resistance, the 4th resistance and the second resistance, can adjust output signal.
6. right to use requires the acquisition method of the multi-channel signal acquiring device described in 2 to 4 any one, it is characterized in that, in configuration network, when input signal is positive voltage signal, the second resistance R 2 disconnects, input voltage signal carries out dividing potential drop in the first resistance R 1 and the 3rd resistance R 3, regulates the value of the first resistance and the 3rd resistance, can adjust output signal.
7. right to use requires the acquisition method of the multi-channel signal acquiring device described in 2 to 4 any one, it is characterized in that, in configuration network, when input signal is bipolar current signal or negative current signal, input current signal forms voltage signal when the first resistance and the 3rd resistance, through the first resistance and the 3rd resistance, carry out dividing potential drop, produce bipolarity or negative voltage signal, regulate the value of adjustable reference unit output voltage and the first resistance, the 3rd resistance, the 4th resistance and the second resistance, can adjust output signal.
8. right to use requires the acquisition method of the multi-channel signal acquiring device described in 2 to 4 any one, it is characterized in that, in configuration network, when input signal is positive current signal, disconnect the second resistance, input current signal forms voltage signal when the first resistance and the 3rd resistance, through the first resistance and the 3rd resistance, carry out dividing potential drop, produce positive voltage signal, regulate the value of the first resistance, the 3rd resistance, the 4th resistance and the second resistance, can adjust output signal.
9. right to use requires the acquisition method of the multi-channel signal acquiring device described in 2 to 4 any one, it is characterized in that, in configuration network, when input signal is switching value output signal, disconnect the 3rd resistance, the first resistance and the 4th resistance sum are less than the second resistance, when switching value output signal, output signal=0V, otherwise the output voltage values of output signal=adjustable reference unit.
10. right to use requires the acquisition method of the multi-channel signal acquiring device described in 2 to 4 any one, it is characterized in that, in configuration network, when input signal is switching value dry contact signal, disconnect the 3rd resistance, the first resistance and the 4th resistance sum are less than the second resistance R 2 resistances, when dry contact is closed, output signal=0V, otherwise the output voltage values of output signal=adjustable reference unit.
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| CN104698967A (en) * | 2015-02-10 | 2015-06-10 | 上海鲍麦克斯电子科技有限公司 | Electric controller analog quantity input system and input method thereof |
| 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 |
| CN105281770A (en) * | 2015-10-26 | 2016-01-27 | 云顶科技（江苏）有限公司 | Analog signal processing circuit |
| 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 |
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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 |
| CN104267640A (en) * | 2014-09-23 | 2015-01-07 | 中国北方车辆研究所 | Acquisition circuit universally used for analog signals |
| 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 |
| CN104460462A (en) * | 2014-12-13 | 2015-03-25 | 华北电力大学 | Sampling circuit compatible with unipolar and bipolar analog signals |
| CN104698967A (en) * | 2015-02-10 | 2015-06-10 | 上海鲍麦克斯电子科技有限公司 | Electric controller analog quantity input system and input method thereof |
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| CN106468897A (en) * | 2015-08-21 | 2017-03-01 | 博世力士乐(西安)电子传动与控制有限公司 | Interface arrangement 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 |
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| 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 |
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| 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 |
| CN114362754A (en) * | 2022-03-21 | 2022-04-15 | 成都凯天电子股份有限公司 | Multichannel analog signal acquisition and processing system |
| CN114362754B (en) * | 2022-03-21 | 2022-06-07 | 成都凯天电子股份有限公司 | Multichannel analog signal acquisition and processing system |
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