CN104467864A - High-speed and anti-interference bridge signal collecting card - Google Patents
High-speed and anti-interference bridge signal collecting card Download PDFInfo
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- CN104467864A CN104467864A CN201410658907.7A CN201410658907A CN104467864A CN 104467864 A CN104467864 A CN 104467864A CN 201410658907 A CN201410658907 A CN 201410658907A CN 104467864 A CN104467864 A CN 104467864A
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Abstract
A high-speed and anti-interference bridge signal collecting card comprises a bridge signal collecting input interface, a bothway digital interface, a signal processing circuit, a power supply interface, a power converting module and a bridge power interface. The signal processing circuit comprises a signal processing module, a sigma-delta high-speed integral type ADC chip, a high-speed digital value buffering chip (Buf1), a high-speed signal isolation module and an output signal buffering module (Buf2), all of which are connected in sequence. The signal processing module comprises a low-pass filter, an AIN conditioning circuit and an operation amplifier, all of which are connected in sequence. The bridge signal collecting input interface is connected with the low-pass filter. The operation amplifier is connected with the sigma-delta high-speed integral type ADC chip. The output signal buffering module (Buf2) is connected with the bothway digital interface. The high-speed and anti-interference bridge signal collecting card is high in precision and anti-interference performance, flexible and wide in application, convenient to install and high in reliability.
Description
Technical field
The present invention relates to a kind of data acquisition card, especially relate to and a kind ofly to have at a high speed and the bridge signal capture card of high noise immunity.
Background technology
Existing data acquisition card, speed is low, and interference free performance is poor, and signal input part and Signal transmissions end are not isolated.
Current data acquisition card can not be applied to multi-signal as standalone module and gather occasion.
Existing data acquisition card external interface complex forms, board integration is low, volume is large, and function singleness.
Summary of the invention
The technical problem to be solved in the present invention is: the defect overcoming prior art, proposes the anti-interference bridge signal capture card of a kind of high speed, has high accuracy, high noise immunity, applying flexible is extensive, easy for installation and reliability is high plurality of advantages.
In order to solve the problem, the present invention proposes following technical scheme: the anti-interference bridge signal capture card of a kind of high speed, it comprise a bridge signal Gather and input interface, bidirectional digital interface, one be connected to the signal processing circuit between this bridge signal Gather and input interface and this bidirectional digital interface, a power supply interface, power transfer module, a bridge power supply interface;
This signal processing circuit, along described bridge signal Gather and input interface to this bidirectional digital interface direction, includes the signal processing module connected successively, a sigma-delta high speed integrated AD C chip, a high-speed figure amount buffer chip (Buf1), a high speed signal isolation module and output signal buffer module (Buf2);
This signal processing module comprises the low pass filter connected successively, an AIN modulate circuit and an operational amplifier;
This bridge signal Gather and input interface is connected with this low pass filter;
This operational amplifier is connected with this sigma-delta high speed integrated AD C chip;
This output signal buffer module (Buf2) is connected with this bidirectional digital interface;
This power transfer module comprises a DC/DC isolated variable module;
This power supply interface gives this DC/DC isolated variable module for power supply, and this DC/DC isolated variable module carries out direct voltage conversion and isolation, generates the isolation DC supply voltage required for each functional module of this capture card.
The further restriction of technique scheme is, this sigma-delta high speed integrated AD C chip is the sigma-delta high speed integrated AD C chip of 24.
The further restriction of technique scheme is, this power transfer module also comprises a VREF power supply, AVDD power supply, a DVDD power supply, an IOVDD power supply and a bridge power supply generative circuit;
This VREF power supply gives this sigma-delta high speed integrated AD C chip power supply;
This AVDD power supply powers to this sigma-delta high speed integrated AD C chip and signal processing module;
This DVDD power supply powers to this high-speed figure amount buffer chip (Buf1) and this former limit of high speed signal isolation module;
This IOVDD power supply gives this sigma-delta high speed integrated AD C chip power supply;
This bridge power supply generative circuit comprises bridge power supply and bridge power supply, powers respectively to electric bridge.
The further restriction of technique scheme is, this low pass filter is made up of four filters.
The further restriction of technique scheme is, one group of modulate circuit that this AIN modulate circuit is made up of AIN1 ~ AIN4.
Compared with prior art, the present invention has following beneficial effect:
1, high accuracy: the present invention adopts the sigma-delta high speed integrated AD C chip of 24, and reach 17 bit resolutions without error code precision, effective accuracy reaches 19 bit resolutions, namely 1/524288; Interference protection measure ensures that sigma-delta high speed integrated AD C chip can play best resolution, thus effectively improves the resolution of final bridge signal.
2, high noise immunity: the working site electromagnetic environment residing for data collecting card is severe, general data capture card is easily subject to electromagnetic interference and causes image data to make mistakes, and capture card of the present invention improves the anti-interference of capture card by following measures: the element collocation that (1) is suitable; (2) rational electrical layout and paving copper; (3) effective shielding measure; (4) complete signal isolation.
3, applying flexible is extensive: data collecting card perfect in shape and function of the present invention, and achieves the completely isolated of signal input part and Signal transmissions end, can be applied to multi-signal and gather occasion, realize the flexible configuration of system as standalone module.
4, easy for installation, volume is little: data collecting card external interface form of the present invention is simple, and board integration is high, volume is little, and complete function, is convenient to various system in combination.
5, reliability is high: data collecting card of the present invention, covers the aspect such as copper and quarantine measures ensure that its reliability from circuit design, parts selection, pcb board layout.The lifting of anti-interference is achieved from omnibearing design considerations.
6, experiment proves: the bridge signal of 2mV/V can realize the resolution of 1/200000, and signal bandwidth can reach 52kHz, and most high sampling rate reaches 128kHz, and eliminates the signal disturbing that the servomotor in application produces completely, and to-noise ratio at least improves 40dB.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention.
Fig. 2 is outside drawing in kind of the present invention.
Fig. 3 is PCB component placement figure of the present invention.
Fig. 4 is that PCB of the present invention covers copper layout.
Fig. 5 is that the present invention surveys anti-interference contrast oscillogram (original waveform figure, interference signal Vpp=6).
Fig. 6 is that the present invention surveys anti-interference contrast oscillogram (after adopting interference protection measure, interference signal Vpp=0.025).
Embodiment
As shown in Figures 1 to 6, the present invention proposes the anti-interference bridge signal capture card of a kind of high speed, and it comprises: a bridge signal Gather and input interface 1, bidirectional digital interface 2, is connected to signal processing circuit 3, power supply interface 4, power transfer module 5, the bridge power supply interface 6 between this bridge signal Gather and input interface 1 and this bidirectional digital interface 2.
This signal processing circuit 3, along described bridge signal Gather and input interface 1 to this bidirectional digital interface 2 direction, includes a signal processing module 31, sigma-delta high speed integrated AD C chip 32, the high-speed figure amount buffer chip Buf1 connected successively, a high speed signal isolation module 34 and an output signal buffer module Buf2.
This signal processing module 31 comprises the low pass filter (LPO) connected successively, one group of AIN1 ~ AIN4 modulate circuit and an operational amplifier (Opa).
This low pass filter (LPO) is made up of four filters LPO1, LPO2, LPO3, LPO4.
This operational amplifier (Opa) is one group of operational amplifier.
This bridge signal Gather and input interface 1 and this four low pass filters LPO1, LPO2, LPO3, LPO4 are connected.
This operational amplifier is connected with this sigma-delta high speed integrated AD C chip 32.
This sigma-delta high speed integrated AD C chip 32 is sigma-delta high speed integrated AD C chips of 24.
This output signal buffer module Buf2 is connected with this bidirectional digital interface 2.
This power transfer module 5 comprises a DC/DC isolated variable module 51, VREF power supply 52, AVDD power supply 53, DVDD power supply 54, IOVDD power supply 55 and a bridge power supply generative circuit 56.
This power supply interface 4 connects external power source, powers to this DC/DC isolated variable module 51.
This DC/DC isolated variable module 51 carries out direct voltage conversion and isolation, generates the isolation DC supply voltage required for each functional module of this capture card.
This DC/DC isolated variable module 51 plays the effect of the former secondary both sides of power supply for electric isolution.
This VREF power supply 52 powers to this sigma-delta high speed integrated AD C chip 32.
This AVDD power supply 53 powers to this sigma-delta high speed integrated AD C chip 32 and signal processing module 31.
This DVDD power supply 54 powers to this high-speed figure amount buffer chip Buf1 and this former limit of high speed signal isolation module 34.
This IOVDD power supply 55 powers to this sigma-delta high speed integrated AD C chip 32.
This bridge power supply generative circuit 56 comprises bridge power supply 1 and bridge power supply 2, powers respectively to electric bridge.
After signal to be collected is inputted by bridge signal Gather and input interface 1, entering signal processing module 31, analog signal after process enters this sigma-delta high speed integrated AD C chip 32, analog signal is converted to digital signal, this digital signal is again through this high-speed figure amount buffer chip Buf1, enter this high speed signal isolation module 34, eventually pass this output signal buffer module Buf2, receive this bidirectional digital interface 2, CPU (not shown), data acquisition and a transmitting procedure of capture card of the present invention connection is transferred to by this bidirectional digital interface 2.
As shown in Figure 2, the parts selection of capture card of the present invention, circuit layout and configuration design.
This sigma-delta high speed integrated AD C chip 32 have employed the sigma-delta high speed integrated AD C chip of 24.Reach 17 bit resolutions without error code precision, effective accuracy reaches 19 bit resolutions, and namely 1/524288; Interference protection measure ensures that this sigma-delta high speed integrated AD C chip 32 can play best resolution, thus effectively improves the resolution of final bridge signal, and then ensure that the high accuracy of the anti-interference bridge signal capture card of high speed of the present invention.
Power Management Design in capture card of the present invention have employed isolation scheme.
Take the component placement scheme shown in Fig. 3 and Fig. 4 and PCB covers copper scheme.
As shown in Figure 2, from circuit design, parts selection, pcb board layout covers copper and start with in quarantine measures aspect, ensure that this electric bridge capture card has the performance of high speed, high accuracy and high noise immunity.Mainly contain following measures:
1, suitable element collocation
In Fig. 3, the instrument amplifier that B1 signal processes foremost and cooperation supersymmetry element, effectively suppress the common mode disturbances that bridge signal line is introduced.
In Fig. 3, B2 AD front end Differential OPAMP, suppresses common-mode signal interference further.
In Fig. 3, C AD samples sigma-delta type, and namely itself eliminate High-frequency Interference, during example AD, 128kHz sample rate used, reaches more than-105dB to more than 64kHz frequency signal signal to noise ratio.
In Fig. 3, B4 uses insulating power supply, and B5 uses pi type filter in power supply front end.
2, rational electrical layout and paving copper
Fig. 3 signal from left to right flows to, and centre is introduced without other interference sources.
Fig. 2 PCB adopts 4 laminate designs, complete independent paving layers of copper.
Fig. 4 spreads effective distribution of the moat of copper, paving copper has been divided into the stratum of A1 A2 A3 A4 tetra-block comminute, effectively prevent and introduce signal A1 to AD handling part A2, the interference that digital signal A3 is formed A2 and crosstalk mutually, the paving copper be separated between moat and power supply ground A4 have independent cabling to form star earthing mode.
3, effective shielding measure
Fig. 3 B1 adopts radome process to the signal front-end processing unit being vulnerable to most disturb.
4, complete signal isolation
The digital signal that Fig. 3 all AD processing sections B1 B2 C generates completes numeral isolation by B3, blocks the noise from digital circuit in circuit.
Use insulating power supply B4 in Fig. 3, make whole AD partly use the independently Power supply separated completely, block the noise from power circuit.
Oscillogram is as shown in Figure 5 and Figure 6 that the test in anti-interference with more dominance energy proves.
To sum up, high speed of the present invention anti-interference bridge signal capture card has following Advantageous Effects:
1, high accuracy: the present invention adopts the sigma-delta high speed integrated AD C chip 32 of 24, and reach 17 bit resolutions without error code precision, effective accuracy reaches 19 bit resolutions, namely 1/524288; Interference protection measure ensures that sigma-delta high speed integrated AD C chip 32 can play best resolution, thus effectively improves the resolution of final bridge signal.
2, high noise immunity: the working site electromagnetic environment residing for data collecting card is severe, general data capture card is easily subject to electromagnetic interference and causes image data to make mistakes, and capture card of the present invention improves the anti-interference of capture card by following measures: the element collocation that (1) is suitable; (2) rational electrical layout and paving copper; (3) effective shielding measure; (4) complete signal isolation.
3, applying flexible is extensive: data collecting card perfect in shape and function of the present invention, and achieves the completely isolated of signal input part and Signal transmissions end, can be applied to multi-signal and gather occasion, realize the flexible configuration of system as standalone module.
4, easy for installation, volume is little: data collecting card external interface form of the present invention is simple, and board integration is high, volume is little, and complete function, is convenient to various system in combination.
5, reliability is high: data collecting card of the present invention, covers the aspect such as copper and quarantine measures ensure that its reliability from circuit design, parts selection, pcb board layout.The lifting of anti-interference is achieved from omnibearing design considerations.
Experiment proves: the bridge signal of 2mV/V can realize the resolution of 1/200000, and signal bandwidth can reach 52kHz, and most high sampling rate reaches 128kHz, and eliminates the signal disturbing that the servomotor in application produces completely, and to-noise ratio at least improves 40dB.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the anti-interference bridge signal capture card of high speed, it is characterized in that, it comprise a bridge signal Gather and input interface, bidirectional digital interface, one be connected to the signal processing circuit between this bridge signal Gather and input interface and this bidirectional digital interface, a power supply interface, power transfer module, a bridge power supply interface;
This signal processing circuit, along described bridge signal Gather and input interface to this bidirectional digital interface direction, includes the signal processing module connected successively, a sigma-delta high speed integrated AD C chip, a high-speed figure amount buffer chip (Buf1), a high speed signal isolation module and output signal buffer module (Buf2);
This signal processing module comprises the low pass filter connected successively, an AIN modulate circuit and an operational amplifier;
This bridge signal Gather and input interface is connected with this low pass filter;
This operational amplifier is connected with this sigma-delta high speed integrated AD C chip;
This output signal buffer module (Buf2) is connected with this bidirectional digital interface;
This power transfer module comprises a DC/DC isolated variable module;
This power supply interface gives this DC/DC isolated variable module for power supply, and this DC/DC isolated variable module carries out direct voltage conversion and isolation, generates the isolation DC supply voltage required for each functional module of this capture card.
2. the anti-interference bridge signal capture card of high speed according to claim 1, is characterized in that, this sigma-delta high speed integrated AD C chip is the sigma-delta high speed integrated AD C chip of 24.
3. the anti-interference bridge signal capture card of high speed according to claim 1, is characterized in that, this power transfer module also comprises a VREF power supply, AVDD power supply, a DVDD power supply, an IOVDD power supply and a bridge power supply generative circuit;
This VREF power supply gives this sigma-delta high speed integrated AD C chip power supply;
This AVDD power supply powers to this sigma-delta high speed integrated AD C chip and signal processing module;
This DVDD power supply powers to this high-speed figure amount buffer chip (Buf1) and this former limit of high speed signal isolation module;
This IOVDD power supply gives this sigma-delta high speed integrated AD C chip power supply;
This bridge power supply generative circuit comprises bridge power supply and bridge power supply, powers respectively to electric bridge.
4. the anti-interference bridge signal capture card of high speed according to claim 1, is characterized in that, this low pass filter is made up of four filters.
5. the anti-interference bridge signal capture card of high speed according to claim 1, is characterized in that, one group of modulate circuit that this AIN modulate circuit is made up of AIN1 ~ AIN4.
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| CN201410658907.7A CN104467864B (en) | 2014-11-18 | 2014-11-18 | A kind of anti-interference bridge signal capture card of high speed |
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| CN201410658907.7A CN104467864B (en) | 2014-11-18 | 2014-11-18 | A kind of anti-interference bridge signal capture card of high speed |
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| CN104467864A true CN104467864A (en) | 2015-03-25 |
| CN104467864B CN104467864B (en) | 2018-05-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110477901A (en) * | 2019-08-27 | 2019-11-22 | 武汉吉星医疗科技有限公司 | A kind of physiological signals acquisition card |
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| US8294605B1 (en) * | 2009-12-16 | 2012-10-23 | Syntropy Systems, Llc | Conversion of a discrete time quantized signal into a continuous time, continuously variable signal |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Deng Jugao Inventor after: Liu Junfeng Inventor before: Deng Jugao Inventor before: Liu Jian Inventor before: Liu Junfeng |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20180410 Address after: 523000, Guangdong City, Dongguan province Zhangmutou town government official community, Silver Ridge rich industrial zone B building on the third floor Applicant after: Dongguan South Detection Instrument Co., Ltd. Address before: 523000 Guangdong Province, Dongguan City Zhangmutou town official Cangyin Ling rich industrial zone D Building No. 3 Applicant before: DONGGUAN HAOKE DETECTION INSTRUMENT CO., LTD. |
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