CN105281770A - Analog signal processing circuit - Google Patents
Analog signal processing circuit Download PDFInfo
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- CN105281770A CN105281770A CN201510701139.3A CN201510701139A CN105281770A CN 105281770 A CN105281770 A CN 105281770A CN 201510701139 A CN201510701139 A CN 201510701139A CN 105281770 A CN105281770 A CN 105281770A
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Abstract
The invention discloses a relatively safe analog signal processing circuit capable of simultaneously acquiring current signals and thermal resistance signals. The analog signal processing circuit comprises at least one current signal sampling circuit, a current signal conditioning and amplifying circuit, a current signal channel switching circuit, at least one resistance signal sampling circuit, a resistance signal amplifying circuit, a resistance signal channel switching circuit, a double-channel analog-to-digital conversion circuit, a signal shaping and isolation output circuit and a reference circuit, wherein the current signal conditioning and amplifying circuit and the current signal sampling circuit are in one-to-one correspondence; the current signal channel switching circuit is matched with the current signal conditioning and amplifying circuit; the resistance signal amplifying circuit and the resistance signal sampling circuit are in one-to-one correspondence; the resistance signal channel switching circuit is matched with the resistance signal amplifying circuit; the double-channel analog-to-digital conversion circuit is used for switching current/resistance signals and performing analog-to-digital conversion; and the reference circuit is used for providing reference voltage for the current signal channel switching circuit, the resistance signal amplifying circuit and the resistance signal channel switching circuit. The analog signal processing circuit disclosed by the invention is particularly applied to an occasion, in which multi-channel 4-20mA signals are measured and the thermal resistance needs to be measured simultaneously.
Description
Technical field
The present invention relates to the circuit multiple sensor signal collected in industry control application being carried out to the process such as filtering, analog-to-digital conversion.
Background technology
Along with Internet of Things developing rapidly in commercial Application, improve constantly the requirement of input and process, also more and more higher to the required precision of the analog quantity collected, meanwhile, the kind of analog quantity also gets more and more.At present, traditional analog signal processing circuit (analog signal collector) is all function singleness mostly, does things in his own way, the multiple same analog quantity with compatibility can not be processed simultaneously, usually same signal can only be gathered, such as: the circuit gathering the current signal of 4-20mA, thermal resistance signal cannot be gathered simultaneously, this much should gather current signal, gather thermal resistance signal occasion again, usual needs two overlap independent circuit, deal with cumbersome, and use cost also significantly increase; In addition, traditional analog signal processing circuit does not arrange buffer circuit between output and input, and the system after exporting of giving brings potential safety hazard.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly can gathers current signal and thermal resistance signal, safer analog signal processing circuit simultaneously.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of analog signal processing circuit, comprise: at least one current signal sample circuit and with current signal sample circuit one to one current signal nurse one's health and amplifying circuit, with the channel current signal commutation circuit that described current signal is nursed one's health and amplifying circuit matches, at least one resistance signal sample circuit, with resistance signal sample circuit resistance signal amplifying circuit one to one, the resistance signal channel switching circuit matched with resistance signal amplifying circuit, for switch current/resistance signal and analog-to-digital double-channel analog/digital change-over circuit, signal shaping and spacing output circuit, and provide the analog power of power supply for channel current signal commutation circuit and resistance signal channel switching circuit, for double-channel analog/digital change-over circuit provides the reference circuit of positive and negative reference voltage, provides the insulating power supply of operating voltage for signal shaping and the corresponding side of spacing output circuit,
Described resistance signal amplifying circuit comprises: provide the constant-current source of reference current, measuring and amplifying circuit and compensate amplifying circuit, reference current changes into voltage signal when the connecting line by hot sampling resistor and hot sampling resistor, these two voltage signals, respectively through measuring and amplifying circuit and the amplification compensating amplifying circuit, obtain measuring voltage and bucking voltage;
Described channel current signal commutation circuit, its effect is that gating one tunnel exports in multiple current signal sample circuit;
Described resistance signal channel switching circuit, its effect is that gating one tunnel exports in multiple resistance signal sample circuit;
Described double-channel analog/digital change-over circuit, its effect is: by a road current signal sample circuit of described channel current signal commutation circuit gating to carry out analog-to-digital conversion with a road resistance sampling signal of described resistance signal channel switching circuit gating;
Described signal shaping and spacing output circuit, its effect is: on the one hand the data exported double-channel analog/digital change-over circuit are carried out shaping and isolation and amplifier, is the corresponding controling end giving described double-channel analog/digital change-over circuit after control command being isolated on the other hand.
As a kind of preferred version, in described a kind of analog signal processing circuit, described resistance signal sample circuit have employed three-wire system thermal resistance, and the lead line of three pins of thermal resistance is respectively arranged with static release circuit.
As a kind of preferred version, in described a kind of analog signal processing circuit, the concrete structure of described constant-current source comprises: operational amplifier, the positive input of operational amplifier is connected with the reference voltage output of reference circuit by forward Input matching resistance, the positive input of operational amplifier is by negative sense Input matching grounding through resistance, and the output of operational amplifier is connected with the respective end compensating amplifying circuit with measuring and amplifying circuit respectively by an output matching resistance
The invention has the beneficial effects as follows: the present invention can gather current signal and thermal resistance signal simultaneously, solve the problem that originally simultaneously can not gather multi-signal; In addition, thermal resistance uses constant-current source to drive, and greatly reduces the impact that self-heating brings; Also by signal shaping and spacing output circuit, eliminate burr and the harmonic wave of digital signal, strengthen driving force, the stability of signal and the fail safe of system; In addition, described constant-current source additionally uses the unique circuit based on operational amplifier, enormously simplify circuit structure, reduces cost; Owing to have employed the resistance signal of three-wire system, significantly improve sampling precision.
Accompanying drawing explanation
Fig. 1 is the electric theory diagram of analog signal processing circuit of the present invention.
Fig. 2 is the electric principle assumption diagram of an embody rule of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, describe the specific embodiments of a kind of analog signal processing circuit of the present invention in detail:
As shown in Figure 1, analog signal processing circuit of the present invention, comprise: 8 road current signal sample circuits, with this 8 road current signal sample circuit one to one 8 road current signals nurse one's health and amplifying circuit, with this channel current signal commutation circuit that 8 road current signal is nursed one's health and amplifying circuit matches, 2 road resistance signal sample circuits, with this 2 road resistance signal sample circuit 2 road resistance signal amplifying circuits one to one, the resistance signal channel switching circuit matched with this 2 road resistance signal amplifying circuit, for switch current/resistance signal and analog-to-digital double-channel analog/digital change-over circuit, signal shaping and spacing output circuit, and provide the analog power of power supply for channel current signal commutation circuit and resistance signal channel switching circuit, for double-channel analog/digital change-over circuit just provides, the reference circuit of negative reference voltage, for signal shaping and the corresponding side of spacing output circuit provide the insulating power supply of operating voltage, described resistance signal amplifying circuit comprises: provide the constant-current source of reference current, measuring and amplifying circuit and compensate amplifying circuit, reference current changes into voltage signal when the connecting line by hot sampling resistor and hot sampling resistor, these two voltage signals, respectively through measuring and amplifying circuit and the amplification compensating amplifying circuit, obtain measuring voltage and bucking voltage,
As shown in Figure 2, described reference circuit is formed primarily of LM285D, described analog power is formed primarily of LM11117M-2.5, for channel current signal commutation circuit and resistance signal channel switching circuit provide the analog power of power supply to provide the operating voltage of 2.5 volts, described channel current signal commutation circuit is that the U1 of ADG708 and associated peripheral circuits thereof are formed by model, its effect is that gating one tunnel exports in 8 road current signal sample circuits, described resistance signal channel switching circuit is that the U3 of ADG708 and associated peripheral circuits thereof are formed by model, its effect is that gating one tunnel exports in 2 road resistance signal sample circuits, analog switch ADG708 has the resistance of only 3 ohm and the switching time of only 14 nanoseconds, meets at a high speed, low-loss demand, described double-channel analog/digital change-over circuit is that the U2 of TM7705 and associated peripheral circuits thereof are formed by model, and its effect is: by a road current signal sample circuit of described channel current signal commutation circuit gating to carry out analog-to-digital conversion with a road resistance sampling signal of described resistance signal channel switching circuit gating, described signal shaping and spacing output circuit, form primarily of optocoupler and operational amplifier, its effect is: on the one hand the data exported double-channel analog/digital change-over circuit are carried out shaping and isolation and amplifier, is the corresponding controling end giving described double-channel analog/digital change-over circuit after control command being isolated on the other hand, described resistance signal sample circuit have employed three-wire system thermal resistance, and the lead line of three pins of thermal resistance is respectively arranged with the static release circuit be made up of TVS pipe, the concrete structure of described constant-current source comprises: operational amplifier, the positive input of operational amplifier is connected with the reference voltage output of reference circuit by forward Input matching resistance, the positive input of operational amplifier is by negative sense Input matching grounding through resistance, the output of operational amplifier is connected with the respective end compensating amplifying circuit with measuring and amplifying circuit respectively by an output matching resistance, for a wherein road, the concrete structure of described constant-current source comprises: as the IC5B (model is LM324) of operational amplifier, resistance R36, R40 and R41, the positive input of the IC5B of operational amplifier is connected with the reference voltage output of reference circuit, 2.5 volts of voltages that reference voltage output exports meet constant-current source voltage stability.In sum, above-mentioned analog signal processing circuit can support the collection of 10 tunnel analog quantitys simultaneously, and wherein, 8 tunnels are the current signal of 4-20mA, and 2 tunnels are thermal resistance signal.
The operation principle of thermal resistance collection of the present invention is: the reference current being produced 1 milliampere (mA) by the constant-current source formed primarily of LM324,1mA can ensure that thermal resistance can not bring impact because of self-heating to measurement, the electric current of 1mA transfers the voltage signal of tens millivolts (mv) to by thermal resistance, this voltage signal obtains V1 after amplifying 10 times by high impedance amplifying circuit again thus passes to measuring circuit; The voltage that compensating circuit is caused by another one channel measurement one line conductor, obtain V2 after magnify 20 after sampling and pass to multi-channel measurement circuit again, use for compensation, compensation is the real voltage V3 obtained by (V1/10-2 × V2/20) on thermal resistance, then can obtain resistance by Ohm's law R=V3/I.Current measured temperature can be received after tabling look-up.
In sum, be only preferred embodiment of the present invention, and be not used for limiting scope of the invention process, all equalization changes done according to shape, structure, feature and the spirit described in the claims in the present invention scope with modify, all should be included in right of the present invention.
Claims (3)
1. an analog signal processing circuit, comprise: at least one current signal sample circuit and with current signal sample circuit one to one current signal nurse one's health and amplifying circuit, it is characterized in that, described analog signal processing circuit also includes: with the channel current signal commutation circuit that described current signal is nursed one's health and amplifying circuit matches, at least one resistance signal sample circuit, with resistance signal sample circuit resistance signal amplifying circuit one to one, the resistance signal channel switching circuit matched with resistance signal amplifying circuit, for switch current/resistance signal and analog-to-digital double-channel analog/digital change-over circuit, signal shaping and spacing output circuit, and provide the analog power of power supply for channel current signal commutation circuit and resistance signal channel switching circuit, for double-channel analog/digital change-over circuit provides the reference circuit of positive and negative reference voltage, provides the insulating power supply of operating voltage for signal shaping and the corresponding side of spacing output circuit,
Described resistance signal amplifying circuit comprises: provide the constant-current source of reference current, measuring and amplifying circuit and compensate amplifying circuit, reference current changes into voltage signal when the connecting line by hot sampling resistor and hot sampling resistor, these two voltage signals, respectively through measuring and amplifying circuit and the amplification compensating amplifying circuit, obtain measuring voltage and bucking voltage;
Described channel current signal commutation circuit, its effect is that gating one tunnel exports in multiple current signal sample circuit;
Described resistance signal channel switching circuit, its effect is that gating one tunnel exports in multiple resistance signal sample circuit;
Described double-channel analog/digital change-over circuit, its effect is: by a road current signal sample circuit of described channel current signal commutation circuit gating to carry out analog-to-digital conversion with a road resistance sampling signal of described resistance signal channel switching circuit gating;
Described signal shaping and spacing output circuit, its effect is: on the one hand the data exported double-channel analog/digital change-over circuit are carried out shaping and isolation and amplifier, is the corresponding controling end giving described double-channel analog/digital change-over circuit after control command being isolated on the other hand.
2. analog signal processing circuit as claimed in claim 1, is characterized in that: described resistance signal sample circuit have employed three-wire system thermal resistance, the lead line of three pins of thermal resistance is respectively arranged with static release circuit.
3. analog signal processing circuit as claimed in claim 1 or 2, it is characterized in that: the concrete structure of described constant-current source comprises: the positive input of operational amplifier is connected with the reference voltage output of reference circuit by forward Input matching resistance, the positive input of operational amplifier is by negative sense Input matching grounding through resistance, and the output of operational amplifier is connected with the respective end compensating amplifying circuit with measuring and amplifying circuit respectively by an output matching resistance.
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| CN201510701139.3A CN105281770B (en) | 2015-10-26 | 2015-10-26 | A kind of analog signal processing circuit |
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| CN201510701139.3A CN105281770B (en) | 2015-10-26 | 2015-10-26 | A kind of analog signal processing circuit |
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| CN105281770A true CN105281770A (en) | 2016-01-27 |
| CN105281770B CN105281770B (en) | 2018-06-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530546A (en) * | 2019-08-16 | 2019-12-03 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of temperature sampling circuit |
| CN111999625A (en) * | 2020-06-02 | 2020-11-27 | 武汉精立电子技术有限公司 | Current monitoring circuit, graphic signal generator and panel detection system |
| CN114217194A (en) * | 2021-11-23 | 2022-03-22 | 河北博威集成电路有限公司 | Testing device |
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| CN101872193A (en) * | 2010-06-23 | 2010-10-27 | 鞍山永恒自控仪表有限公司 | Multifunctional measurement and control module based on field bus |
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Patent Citations (5)
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| US7245248B2 (en) * | 2003-08-08 | 2007-07-17 | Renesas Technology Corp. | A/D converter and a microcontroller including the same |
| CN101119115A (en) * | 2006-08-03 | 2008-02-06 | 深圳达实智能股份有限公司 | Multi-channel A/D conversion device and method |
| CN101872193A (en) * | 2010-06-23 | 2010-10-27 | 鞍山永恒自控仪表有限公司 | Multifunctional measurement and control module based on field bus |
| CN202261241U (en) * | 2011-10-14 | 2012-05-30 | 中国冶金矿业鞍山冶金设计研究院有限责任公司 | Current signal conversion function module |
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| CN110530546A (en) * | 2019-08-16 | 2019-12-03 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of temperature sampling circuit |
| CN110530546B (en) * | 2019-08-16 | 2021-12-24 | 中国航空工业集团公司西安飞行自动控制研究所 | Temperature sampling circuit |
| CN111999625A (en) * | 2020-06-02 | 2020-11-27 | 武汉精立电子技术有限公司 | Current monitoring circuit, graphic signal generator and panel detection system |
| CN114217194A (en) * | 2021-11-23 | 2022-03-22 | 河北博威集成电路有限公司 | Testing device |
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| CN105281770B (en) | 2018-06-19 |
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