CN102087508A - Intrinsically safe isolating explosion-proof type analog quantity output system - Google Patents
Intrinsically safe isolating explosion-proof type analog quantity output system Download PDFInfo
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- CN102087508A CN102087508A CN2009102497588A CN200910249758A CN102087508A CN 102087508 A CN102087508 A CN 102087508A CN 2009102497588 A CN2009102497588 A CN 2009102497588A CN 200910249758 A CN200910249758 A CN 200910249758A CN 102087508 A CN102087508 A CN 102087508A
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Abstract
The invention relates to an intrinsically safe isolating explosion-proof type analog quantity output system. The system comprises a signal output circuit, an intrinsically safe energy limiting circuit, a signal transmission modulator circuit, a highway addressable remote transducer (HART) signal demodulation circuit, an HART signal modulator circuit, a signal transmission demodulation circuit, a signal input current limiting circuit, a first transformer, a second transformer and a third transformer, wherein the signal input current limiting circuit is connected with the signal transmission modulator circuit; the signal transmission modulator circuit is connected with the HART signal demodulation circuit; the signal transmission modulator circuit is connected with the signal transmission demodulation circuit by the second transformer; the HART signal demodulation circuit is connected with the HART signal modulator circuit by the third transformer; the signal transmission demodulation circuit is connected with the HART signal modulator circuit and the intrinsically safe energy limiting circuit respectively; and the intrinsically safe energy limiting circuit is connected with the signal output circuit. Compared with the prior art, the intrinsically safe isolating explosion-proof type analog quantity output system has the advantages of low power consumption, explosion prevention function and the like.
Description
Technical field
The present invention relates to the analog quantity output system, especially relate to a kind of intrinsic safety and isolate explosion-proof type analog quantity output type system.
Background technology
In recent years, along with China's rapid economy development, the development of industrial automation has also been proposed more and more higher requirement, sharply increased for the quantity demand of industrial automation control system equipment, its scale also has The Enlargement Tendency.At present, used electrical equipment is most in industrial control system that we are used and the system adopts in external import, especially some large and medium size projects, as industries such as petrochemical industry, metallurgy, pharmacy, boats and ships.According to market survey, these industries all have the active demand with system's cost degradation, but owing to use external imported product more, the hardware cost of its system and maintenance, repair cost are difficult to reduce, and have hindered the expansion of system scale.Simultaneously, a part of domestic supplier is in order to enter fast and to dominate the market, ignore the performance and the mass reduction cost of product, to reduce selling price, but this has also caused this class homemade goods to be difficult to enter mega project conversely, can only lean on the low price advantage to carry out feverish price war, in low profit margin, compete.Finally caused vicious cycle, the national industry development is slow, weak in capability of independently developing, has aggravated the polarization with external industrial goods simultaneously.
The product orientation of this project institute Development and Production is in middle and high-end market, and the targeted customer tends to the Process Control System of large and medium size projects.
Approaching on technical indicator and product is the leading level in the world of representative with P+F (Germany), Phoenix (Germany), MTL (Britain) etc., simultaneously, increasing is to the input of the anti-interference and reliable long-term working of EMC electromagnetic compatibility, Study on Stability and test, improve its antijamming capability and quality, in main performance with reach leading domestic qualitatively.Simultaneously,, on magnetic couplings device and other core devices, adopt the novel low-cost material of research and development voluntarily to substitute, under the prerequisite that does not reduce performance quality, reduce cost by technical renovation.In addition, compare with external product, it is shorter that this product has delivery date, the advantage that the maintenance, repair cost is low.
By independent research, the technical feature between shortening and external imported product and the gap of quality enter large and medium-sized project by the low price advantage simultaneously, increase the market share of homemade industrial goods in some key projects, revitalize national industry.Simultaneously, progressively extend, improve the overall technology performance class of homemade goods to middle-size and small-size project.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of intrinsic safety to isolate explosion-proof type analog quantity output type system for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of intrinsic safety is isolated explosion-proof type analog quantity output type system, it is characterized in that, this system comprises power supply stabilization circuit, the DC/AC change-over circuit, the one AC/DC change-over circuit, the 2nd AC/DC change-over circuit, signal output apparatus, intrinsic safety limit energy circuit, signal transmission modulation circuit, the HART signal demodulating circuit, the HART signal modulation circuit, signal transmission demodulator circuit, signal input current-limiting circuit, first transformer, second transformer, the 3rd transformer, described power supply stabilization circuit is connected with the DC/AC change-over circuit, described DC/AC change-over circuit by first transformer respectively with an AC/DC change-over circuit, the 2nd AC/DC change-over circuit connects, a described AC/DC change-over circuit transmits modulation circuit with signal respectively, signal input current-limiting circuit connects, described the 2nd AC/DC change-over circuit is connected with signal transmission demodulator circuit, described signal input current-limiting circuit is connected with signal transmission modulation circuit, described signal transmission modulation circuit is connected with the HART signal demodulating circuit, described signal transmission modulation circuit is by second transformer and signal transmission demodulator circuit, described HART signal demodulating circuit is connected with the HART signal modulation circuit by the 3rd transformer, described signal transmission demodulator circuit respectively with the HART signal modulation circuit, the intrinsic safety limit can connect by circuit, and described intrinsic safety limit can be connected with signal output apparatus by circuit.
Described power supply stabilization circuit comprises filtering circuit, DC/DC change-over circuit, and described filtering circuit is connected with external power source, DC/DC change-over circuit respectively, and described DC/DC change-over circuit is connected with the DC/AC change-over circuit.
Described first transformer, second transformer, the 3rd transformer are the soft magnetic ferrite isolating transformer.
Compared with prior art, the present invention has the following advantages:
1, high-level efficiency DC/DC switch technology
Low-power Technology has adopted novel DC/DC change-over circuit technology, has improved energy conversion efficiency on the one hand, has significantly reduced power consumption, has reached the purpose of energy-conserving and environment-protective; On the other hand,, help to reduce the thermal value of module when work, improve the reliability of long-term work owing to reduced power consumption.
2, intrinsic safe explosion-proof technology
Limited from the pulpit, place of safety the circuit energy of leading to the explosive area reliably, prevented that hazardous location damp and dust from blasting because of the circuit spark.
3, high precision magnetic isolation coupling technology
High precision magnetic isolation coupling technology cooperates suitable peripheral circuit parameter and transmission compensating circuit with high-precision magnetic material device, has both obtained higher transmission precision, has reduced cost again, helps improving the competitiveness of product in market.
4, EMC electromagnetic compatibility Anti-Jamming Technique
EMC electromagnetic compatibility Anti-Jamming Technique by to circuit parameter research with to the design of PCB circuit board, improves the module anti-jamming capacity, helps adapting to on-the-spot complex electromagnetic environments, has improved the reliability and stability of module.
5, HART intelligent communication technology
HART intelligent communication technology has realized the both-way communication between field intelligent instrument and pulpit, has improved the informationization of industrial control field.
Description of drawings
Fig. 1 isolates the structural representation of explosion-proof type analog quantity output type system for a kind of intrinsic safety of the present invention;
Fig. 2 isolates the circuit diagram of the power supply stabilization circuit of explosion-proof type analog quantity output type system for a kind of intrinsic safety of the present invention;
Fig. 3 isolates the circuit diagram of the DC/AC change-over circuit of explosion-proof type analog quantity output type system for a kind of intrinsic safety of the present invention;
Fig. 4 isolates the circuit diagram of the AC/DC change-over circuit of explosion-proof type analog quantity output type system for a kind of intrinsic safety of the present invention;
Fig. 5 isolates the circuit diagram of the signal input current-limiting circuit of explosion-proof type analog quantity output type system for a kind of intrinsic safety of the present invention;
Fig. 6 isolates the signal transmission modulation circuit of explosion-proof type analog quantity output type system, the circuit diagram of signal transmission demodulator circuit for a kind of intrinsic safety of the present invention;
Fig. 7 isolates the circuit diagram of the signal output apparatus of explosion-proof type analog quantity output type system for a kind of intrinsic safety of the present invention;
Fig. 8 isolates the HART signal demodulating circuit of explosion-proof type analog quantity output type system, the circuit diagram of HART signal modulation circuit for a kind of intrinsic safety of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
As shown in Figure 1, a kind of intrinsic safety is isolated explosion-proof type analog quantity output type system, this system comprises power supply stabilization circuit 1, DC/AC change-over circuit 4, the one AC/DC change-over circuit 5, the 2nd AC/DC change-over circuit 6, signal output apparatus 7, intrinsic safety limit energy circuit 8, signal transmission modulation circuit 10, HART signal demodulating circuit 12, HART signal modulation circuit 13, signal transmission demodulator circuit 9, signal input current-limiting circuit 11, first transformer 14, second transformer 15, the 3rd transformer 16, described power supply stabilization circuit 1 is connected with DC/AC change-over circuit 4, described DC/AC change-over circuit 4 by first transformer 14 respectively with an AC/DC change-over circuit 5, the 2nd AC/DC change-over circuit 6 connects, a described AC/DC change-over circuit 5 transmits modulation circuit 10 with signal respectively, signal input current-limiting circuit 11 connects, described the 2nd AC/DC change-over circuit 6 is connected with signal transmission demodulator circuit 9, described signal input current-limiting circuit 11 is connected with signal transmission modulation circuit 10, described signal transmission modulation circuit 10 is connected with HART signal demodulating circuit 12, described signal transmission modulation circuit 10 is by second transformer 15 and signal transmission demodulator circuit 9, described HART signal demodulating circuit 12 is connected with HART signal modulation circuit 13 by the 3rd transformer 16, described signal transmission demodulator circuit 9 respectively with HART signal modulation circuit 13, the intrinsic safety limit can connect by circuit 8, and described intrinsic safety limit can be connected with signal output apparatus 7 by circuit 8.Described power supply stabilization circuit 1 comprises filtering circuit 2, DC/DC change-over circuit 3, and described filtering circuit 2 is connected with external power source, DC/DC change-over circuit 3 respectively, and described DC/DC change-over circuit 3 is connected with DC/AC change-over circuit 4.
As shown in Figure 2, power supply stabilization circuit 1 adopts the TVS pipe, the quick fuse fuse, and the reverse protection diode, devices such as inductance, electric capacity are protected and filtering power unit.Wherein, but TVS pipe transient suppression voltage (surge) impacts; quick fuse fuse short-circuit protection internal circuit when abnormality occurring and produce big electric current is not damaged; diode can carry out reverse-voltage protection; resistance, electric capacity are formed simple and easy wave filter, and the high frequency ripple that is easy in the filter out power is disturbed.DC/DC (DC-DC) circuit passes through LM317, FZT751, and components and parts such as resistance, electric capacity, inductance realize that for power consumption, high precision voltage stabilizing high power DC voltage-stabilizing function improves power-efficient, reduces power consumption.
As shown in Figure 3, DC/AC change-over circuit 4 is made of multivibrator CD4047 and 2N7002MOS pipe, resistance, electric capacity and transformer.Direct supply is converted to high frequency square wave, realizes inversion, transferring to transformer with form of communication by two metal-oxide-semiconductor alternate conduction, and by transformer coupled to the input and output side.
As shown in Figure 4, the AC/DC change-over circuit is made of commutation diode, stabilivolt, electric capacity, pull-up resistor.The AC signal on the former limit of transformer is converted to direct supply, uses for back-end circuit.
As shown in Figure 5, signal input current-limiting circuit 11 is made up of transient voltage killer tube (TVS), inductance, MOSFET, transistor resistance, electric capacity, has realized input signal protection and signal current-limiting function.Wherein the main surge voltage that suppresses of TVS pipe is disturbed, inductance, electric capacity are formed π type filtered circuit, suppress high frequency interference, MOSFET, transistor and resistance are formed simple current-limiting circuit, when the input circuit electric current surpasses limit value, transistor turns, and MOSFET leaks, two ends, source equivalent variable resistance increases rapidly, reaches the purpose of current limliting.
As shown in Figure 6, signal transmission modulation circuit 10, signal transmission demodulator circuit 9 are mainly by metal-oxide-semiconductor, components and parts such as transformer, resistance and electric capacity are formed, and 4～20mA dc current signal of left side input carries out high frequency modulated through the alternate conduction of MOSFET, is coupled by isolating transformer.Being reduced to direct current signal after two MOSFET demodulation of outgoing side through symmetry transmits.
As shown in Figure 7, signal output apparatus is made up of amplifier, transistor, potentiometer, resistance, electric capacity.By after the feedback regulation and error compensation of this electric current, carry out the signal transmission through the dc current signal of demodulation to equipment such as the valve positioner at hazardous side scene, electropneumatic transducer.
As shown in Figure 8, HART signal demodulating circuit, HART signal modulation circuit are made up of transformer, resistance, capacitance network, HART signal from input side toward outgoing side is superimposed upon on 4～20mA circuit and transmits, and transfers to input side from the HART signal of outgoing side after the modulation and demodulation of this circuit.
Claims (3)
1. an intrinsic safety is isolated explosion-proof type analog quantity output type system, it is characterized in that, this system comprises power supply stabilization circuit, the DC/AC change-over circuit, the one AC/DC change-over circuit, the 2nd AC/DC change-over circuit, signal output apparatus, intrinsic safety limit energy circuit, signal transmission modulation circuit, the HART signal demodulating circuit, the HART signal modulation circuit, signal transmission demodulator circuit, signal input current-limiting circuit, first transformer, second transformer, the 3rd transformer, described power supply stabilization circuit is connected with the DC/AC change-over circuit, described DC/AC change-over circuit by first transformer respectively with an AC/DC change-over circuit, the 2nd AC/DC change-over circuit connects, a described AC/DC change-over circuit transmits modulation circuit with signal respectively, signal input current-limiting circuit connects, described the 2nd AC/DC change-over circuit is connected with signal transmission demodulator circuit, described signal input current-limiting circuit is connected with signal transmission modulation circuit, described signal transmission modulation circuit is connected with the HART signal demodulating circuit, described signal transmission modulation circuit is by second transformer and signal transmission demodulator circuit, described HART signal demodulating circuit is connected with the HART signal modulation circuit by the 3rd transformer, described signal transmission demodulator circuit respectively with the HART signal modulation circuit, the intrinsic safety limit can connect by circuit, and described intrinsic safety limit can be connected with signal output apparatus by circuit.
2. a kind of intrinsic safety according to claim 1 is isolated explosion-proof type analog quantity output type system, it is characterized in that, described power supply stabilization circuit comprises filtering circuit, DC/DC change-over circuit, described filtering circuit is connected with external power source, DC/DC change-over circuit respectively, and described DC/DC change-over circuit is connected with the DC/AC change-over circuit.
3. a kind of intrinsic safety according to claim 1 is isolated explosion-proof type analog quantity output type system, it is characterized in that described first transformer, second transformer, the 3rd transformer are the soft magnetic ferrite isolating transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102497588A CN102087508A (en) | 2009-12-02 | 2009-12-02 | Intrinsically safe isolating explosion-proof type analog quantity output system |
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| CN2009102497588A CN102087508A (en) | 2009-12-02 | 2009-12-02 | Intrinsically safe isolating explosion-proof type analog quantity output system |
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| CN102087508A true CN102087508A (en) | 2011-06-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105438942A (en) * | 2015-12-25 | 2016-03-30 | 上海辰竹仪表有限公司 | Door-control safety type isolation module of anti-explosion elevator |
| CN113790304A (en) * | 2021-08-23 | 2021-12-14 | 浙江中控技术股份有限公司 | Intrinsic safety HART communication system for intelligent valve positioner |
| CN114844519A (en) * | 2022-04-06 | 2022-08-02 | 杭州海康威视数字技术股份有限公司 | Isolating device for intrinsic safety circuit and non-intrinsic safety circuit |
| WO2022160423A1 (en) * | 2021-01-28 | 2022-08-04 | 上海辰竹仪表有限公司 | Bidirectional transmission circuit for universal signal |
-
2009
- 2009-12-02 CN CN2009102497588A patent/CN102087508A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105438942A (en) * | 2015-12-25 | 2016-03-30 | 上海辰竹仪表有限公司 | Door-control safety type isolation module of anti-explosion elevator |
| WO2022160423A1 (en) * | 2021-01-28 | 2022-08-04 | 上海辰竹仪表有限公司 | Bidirectional transmission circuit for universal signal |
| CN113790304A (en) * | 2021-08-23 | 2021-12-14 | 浙江中控技术股份有限公司 | Intrinsic safety HART communication system for intelligent valve positioner |
| CN113790304B (en) * | 2021-08-23 | 2023-11-14 | 浙江中控技术股份有限公司 | Intrinsic safety HART communication system for intelligent valve positioner |
| CN114844519A (en) * | 2022-04-06 | 2022-08-02 | 杭州海康威视数字技术股份有限公司 | Isolating device for intrinsic safety circuit and non-intrinsic safety circuit |
| CN114844519B (en) * | 2022-04-06 | 2023-10-10 | 杭州海康威视数字技术股份有限公司 | Isolation device for intrinsic safety circuit and non-intrinsic safety circuit |
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Application publication date: 20110608 |