CN201134155Y - Signal separating and converting circuit - Google Patents
Signal separating and converting circuit Download PDFInfo
- Publication number
- CN201134155Y CN201134155Y CNU2007200771620U CN200720077162U CN201134155Y CN 201134155 Y CN201134155 Y CN 201134155Y CN U2007200771620 U CNU2007200771620 U CN U2007200771620U CN 200720077162 U CN200720077162 U CN 200720077162U CN 201134155 Y CN201134155 Y CN 201134155Y
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- surge protection
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Abstract
The utility model relates to a signal isolation and conversion circuit, comprising a protection circuit against surge, an intrinsic safe energy limiting circuit, a signal modulation circuit, an isolation transformer, a signal demodulation and output circuit, a power modulation circuit and a rectifying circuit, wherein an input voltage/current signal is first fed into the protection circuit against surge to be connected with the signal conversion and modulation circuit via the intrinsic safe energy limiting circuit, the modulated signal is coupled to an output end via the isolation transformer and is output via the signal demodulation circuit and output circuit. The utility model integrates surge protection, intrinsic safe explosion proof and signal isolation transmission functions in one module, isolates power supply, input and output, can realize a safety barrel module with intrinsic safe explosion proof and surge protection function, and is suitable for the process measurement and control system demanding explosion prevention.
Description
Technical field
The utility model relates to a kind of Signal Spacing and change-over circuit, particularly with the Signal Spacing and the change-over circuit of surge protection and intrinsic safe explosion-proof function, is applicable to the process measurement and the control system of intrinsic safe explosion-proof occasion.
Background technology
The overvoltage protection of the electronic equipment in the Measurement and Control System of intrinsic safe explosion-proof occasion more and more comes into one's own, and the economic loss that causes total system to lose efficacy because electronic equipment is damaged the voltage surge that is caused by thunderbolt causing is very big.This is because the electronic component supply voltage is more and more lower, and the raising of device integration and sensitivity in the TT﹠C system makes due to its anti-overvoltage impact capacity reduction.
At present, cause electronic equipment to damage in the Measurement and Control System of intrinsic safe explosion-proof applications in order to prevent lightning strike induction voltage, needing usually to adopt in the safety barrier front increases Surge Protector, and field wiring and cost are increased.
In addition, some spot sensor and electronic metering equipment require to isolate with pulpit equipment, may not produce potential difference (PD) because of the two places apart from each other makes between the signal reference point if do not isolate, and will form ground loop like this, cause the signal transmission distortion.
Summary of the invention
The utility model is not have surge protection function and the high problem of equipment cost at safety barrier in the present intrinsic safe explosion-proof system and propose the Signal Spacing and the change-over circuit of a kind of low cost, high-performance, integrated band surge protection and intrinsic safe explosion-proof function.
The technical solution of the utility model is: a kind of Signal Spacing and change-over circuit; comprise surge protection circuit; intrinsic safety limit energy circuit; signal modulation circuit; isolating transformer; signal is separated the mediation output circuit; power supply modulator circuit and rectification circuit; power supply is respectively by power supply modulator circuit and rectification circuit; obtain required power supply and give each circuit supply; input voltage/current signal at first enters surge protection circuit; can connect conversion of signals and modulation circuit by circuit through the intrinsic safety limit again; signal after the modulation is coupled to output terminal through isolating transformer, through signal demodulating circuit and output circuit output.
Described surge protection circuit comprises that three-end air discharging pipe, decoupling zero resistance, transient voltage suppress diode; the signal two ends also connect the three-end air discharging pipe; as thick protection; the signal two ends are respectively through behind two decoupling zero resistance; and connect transient voltage and suppress diode; with the protection of running business into particular one, surge protection circuit adopts second class protection.
Described intrinsic safety limit can comprise resistance, Zener, fuse by circuit, and input signal is used to be restricted to the explosive area electric current through resistance, and Zener in parallel is used for pressure limiting, and output terminal is used to protect Zener by fuse.
The beneficial effects of the utility model are: realize surge protection function, intrinsic safe explosion-proof function, Signal Spacing transfer function in a module.Use relatively with common split surge protection function and intrinsic safe explosion-proof function, can realize high-performance, low cost, minimizing installing space and wiring workload, be applicable to that intrinsic safe explosion-proof is measured and surge protection, isolation and the transmission of control system signal.
Description of drawings
Fig. 1 is the utility model Signal Spacing and change-over circuit theory diagram;
Fig. 2 is a surge protection circuit schematic diagram in the utility model;
Fig. 3 is intrinsic safety limit energy circuit theory diagrams in the utility model;
Fig. 4 is conversion of signals modulation, isolation, demodulation principle figure in the utility model.
Embodiment
Fig. 1 is the utility model Signal Spacing and transfer principle block diagram.It mainly comprises surge protection circuit 1, intrinsic safety limit energy circuit 2, conversion of signals modulation circuit 3, isolating transformer 5, signal demodulating circuit 6, output circuit 7, power supply modulator circuit 9 and power rectifier circuit 4,8.Signal circuit is connected to surge protection circuit 1 for the current signal; receive intrinsic safety limit energy circuit 2 by surge protection circuit 1 output; be modulated into interchange by conversion of signals modulation circuit 3 then and be sent to outgoing side through isolating transformer 5 couplings; convert direct current signal to through output circuit 7 outputs by signal demodulating circuit 6; electric power loop is that power supply obtains the two-way required voltage through power supply modulator circuit 9 backs by transformer; pass through rectification circuit 4 more respectively; 8 rectifications; one the tunnel is intrinsic safety limit energy circuit 2 and 3 power supplies of conversion of signals modulation circuit, and another road is signal demodulating circuit 6 and output circuit 7 power supplies.
As Fig. 2 is surge protection circuit 1 schematic diagram, and the input signal two ends also connect GDT1 three-end air discharging pipe, as thick protection; the signal two ends are passed through R1, R2 decoupling zero resistance respectively; and connect TVS1 transient voltage inhibition diode, with the protection of running business into particular one, surge protection circuit adopts second class protection.
Fig. 3 is intrinsic safety limit energy circuit 2 schematic diagrams, and input signal is used to be restricted to the explosive area electric current through R30, and Zener Z1 in parallel is used for pressure limiting, and output terminal is used to protect Zener Z1 by fuse F1.
Fig. 4 comprises conversion of signals modulation circuit 3, buffer circuit 5, signal demodulating circuit 6; input signal can be delivered to circuit shown in Figure 4 by circuit 2 through surge protection circuit 1, intrinsic safety limit; constitute analog switch alternate conduction under synchronizing signal control by T2, T3; direct-flow input signal is modulated into AC signal; utilize the mutual inductor principle again, be coupled to outgoing side through isolating transformer 5.In analog switch alternate conduction under synchronizing signal control that outgoing side is made of T4, T5, AC signal is demodulated to direct current after output circuit output equally.
Claims (3)
1, a kind of Signal Spacing and change-over circuit; comprise surge protection circuit, intrinsic safety limit can circuit, signal modulation circuit, isolating transformer, signal separate and be in harmonious proportion output circuit, power supply modulator circuit and rectification circuit; power supply is respectively by power supply modulator circuit and rectification circuit; obtain required power supply and give each circuit supply; it is characterized in that input voltage/current signal at first enters surge protection circuit; can connect conversion of signals and modulation circuit by circuit through the intrinsic safety limit again; signal after the modulation is coupled to output terminal through isolating transformer, through signal demodulating circuit and output circuit output.
2, according to described Signal Spacing of claim 1 and change-over circuit; it is characterized in that described surge protection circuit comprises that three-end air discharging pipe, decoupling zero resistance, transient voltage suppress diode; the signal two ends also connect the three-end air discharging pipe; as thick protection; the signal two ends are respectively through behind two decoupling zero resistance; and connect transient voltage inhibition diode, with the protection of running business into particular one, surge protection circuit adopts second class protection.
3, according to described Signal Spacing of claim 1 and change-over circuit; it is characterized in that described intrinsic safety limit can comprise resistance, Zener, fuse by circuit; input signal is through resistance; be used to be restricted to the explosive area electric current; Zener in parallel; be used for pressure limiting, output terminal is used to protect Zener by fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200771620U CN201134155Y (en) | 2007-12-25 | 2007-12-25 | Signal separating and converting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200771620U CN201134155Y (en) | 2007-12-25 | 2007-12-25 | Signal separating and converting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201134155Y true CN201134155Y (en) | 2008-10-15 |
Family
ID=40062422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200771620U Expired - Fee Related CN201134155Y (en) | 2007-12-25 | 2007-12-25 | Signal separating and converting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201134155Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797575A (en) * | 2012-08-28 | 2012-11-28 | 江西直方数控动力有限公司 | Signal isolation plate in electronic control appliance for mine fuel injection |
| CN103543679A (en) * | 2013-10-28 | 2014-01-29 | 深圳万讯自控股份有限公司 | Intelligent type resistance signal isolated gate |
| CN104866449A (en) * | 2014-02-25 | 2015-08-26 | 北京中安科创科技发展有限公司 | Intrinsic safety type USB (universal serial bus) interface circuit for electronic devices in flammable and combustible places |
| CN106789518A (en) * | 2017-01-17 | 2017-05-31 | 上海辰竹仪表有限公司 | For the CAN signal transmitting device in intrinsic safe explosion-proof field |
| CN107508381A (en) * | 2017-09-25 | 2017-12-22 | 贵州电网有限责任公司电力科学研究院 | One kind is used for active power distribution network intelligent terminal battery isolation monitoring device |
| CN111464175A (en) * | 2020-04-16 | 2020-07-28 | 深圳市顺源科技有限公司 | 10 kilovolt high-voltage-withstanding analog signal isolation circuit |
| CN114142730A (en) * | 2021-01-28 | 2022-03-04 | 上海辰竹仪表有限公司 | Bidirectional transmission circuit of general signal |
-
2007
- 2007-12-25 CN CNU2007200771620U patent/CN201134155Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797575A (en) * | 2012-08-28 | 2012-11-28 | 江西直方数控动力有限公司 | Signal isolation plate in electronic control appliance for mine fuel injection |
| CN103543679A (en) * | 2013-10-28 | 2014-01-29 | 深圳万讯自控股份有限公司 | Intelligent type resistance signal isolated gate |
| CN104866449A (en) * | 2014-02-25 | 2015-08-26 | 北京中安科创科技发展有限公司 | Intrinsic safety type USB (universal serial bus) interface circuit for electronic devices in flammable and combustible places |
| CN104866449B (en) * | 2014-02-25 | 2018-10-12 | 北京中安科创科技发展有限公司 | A kind of intrinsic safety type usb circuit for combustible and explosive area electronic equipment |
| CN106789518A (en) * | 2017-01-17 | 2017-05-31 | 上海辰竹仪表有限公司 | For the CAN signal transmitting device in intrinsic safe explosion-proof field |
| CN107508381A (en) * | 2017-09-25 | 2017-12-22 | 贵州电网有限责任公司电力科学研究院 | One kind is used for active power distribution network intelligent terminal battery isolation monitoring device |
| CN111464175A (en) * | 2020-04-16 | 2020-07-28 | 深圳市顺源科技有限公司 | 10 kilovolt high-voltage-withstanding analog signal isolation circuit |
| CN111464175B (en) * | 2020-04-16 | 2023-08-11 | 深圳市顺源科技有限公司 | 10-kilovolt high-voltage-resistant analog signal isolation circuit |
| CN114142730A (en) * | 2021-01-28 | 2022-03-04 | 上海辰竹仪表有限公司 | Bidirectional transmission circuit of general signal |
| WO2022160423A1 (en) * | 2021-01-28 | 2022-08-04 | 上海辰竹仪表有限公司 | Bidirectional transmission circuit for universal signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081015 Termination date: 20151225 |
|
| EXPY | Termination of patent right or utility model |