CN106851048A - A kind of analog video signal isolation circuit of explosive atmosphere electrical installation - Google Patents
A kind of analog video signal isolation circuit of explosive atmosphere electrical installation Download PDFInfo
- Publication number
- CN106851048A CN106851048A CN201710016331.8A CN201710016331A CN106851048A CN 106851048 A CN106851048 A CN 106851048A CN 201710016331 A CN201710016331 A CN 201710016331A CN 106851048 A CN106851048 A CN 106851048A
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- analog video
- isolation module
- video signal
- module
- guard grating
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The present invention relates to a kind of analog video signal isolation circuit of explosive atmosphere electrical installation, belong to safety in production and ensure apparatus field；Including power isolation module, analog video signal isolation module, lifting die block, boost module and three guard gratings；The primary side of power isolation module and signal isolation module, lifting die block are respectively positioned on non-security district；The secondary side of power isolation module and signal isolation module, boost module, three guard gratings are respectively positioned on place of safety；Power supply is connected with power isolation module primary side all the way, separately leads up to lifting die block and is connected with analog video signal isolation module primary side；Power isolation module secondary side is connected with the first guard grating all the way, and another road passes sequentially through boost module, the second guard grating and is connected with analog video signal isolation module secondary side；Analog video signal isolation module is bi-directionally connected with the 3rd guard grating.The present invention can solve the problems, such as the essential safety of electrical equipment analog video signal communication in explosive atmosphere.
Description
Technical field
The invention belongs to guarantee apparatus field of keeping the safety in production, more particularly to a kind of simulation of explosive atmosphere electrical installation
Vision signal isolation circuit.
Background technology
With the progress of society, the development of science and technology, the electrical equipment for being applied to explosive atmosphere is more and more, these equipment
Intelligent level also more and more higher.Wherein analog video signal have that coffret is simple efficiently, video is Well-recovered and
Low cost and other advantages, have a wide range of applications in vision signal broadcasts recording apparatus.But, according to the explosion-proof shape of electric apparatus for explosive atmospheres
Formula is different, and the analog video signal interface of the safe analog video signal circuit of device interior non-intrinsically safe and non-intrinsically safe safety has
May be exposed in explosive atmosphere, if design is improper so that situations such as lower generation of nonserviceabling is struck sparks, overheats, will
Cause potential danger hidden danger.
According to《GB3836.1-2010 explosive atmosphere part 1s：Device-General requirement》In description, explosive atmosphere
The intrinsically safe circuit design form of electrical installation has many kinds, various anti-explosion electrics such as including essential safe type, flame-proof type, INCREASEDSAFETY
Road design form, while a kind of intrinsically safe circuit design of equipment can also mix uses various intrinsically safe circuit forms.Completely originally
In matter safe devices, single intrinsicallysafecircuit is only existed, the intrinsically safe circuit design of equipment is without considering signal or power supply
The problem of isolation, but when a part of crucial, the necessary circuit parameter in equipment, such as electricity such as electric current, voltage, energy storage ginseng
Number, or the non-electrical parameter such as mechanical rotation, radiation, temperature is when cannot meet the design parameter requirement of intrinsicallysafecircuit, just need
Intrinsically safe circuit form is changed or increases, to reach the electrical explosion proof requirement of equipment, therefore a kind of electrical equipment there is this
Matter safety circuit and immaterial safety circuit.According to《The part of GB3836.4-2010 explosive atmospheres the 4th：By essential safe type
The equipment of " i " protection》Explosion-proof Design requirement, can not have electrical link between intrinsicallysafecircuit and immaterial safety circuit,
In addition to the requirement that circuit two ends will have electric clearance and creep age distance, in addition it is also necessary to pass through phase according to explosive-proof grade and design parameter
The industrial frequency withstand voltage answered is tested.
In actual electric apparatus for explosive atmospheres circuit design, the transmitting terminal or receiving terminal of analog video signal are likely to
Non-intrinsically safe safe end is in, because the input and output of photoelectrical coupler are controlled with optical signal, without directly electric
Contact, it is possible to use photoelectrical coupler realizes the transmission of analog video signal between essential safety and immaterial safety circuit.Simulation
The transmission of vision signal also needs to power supply and is powered with non-intrinsically safe safe end to essential safety end, and this can be realized using isolating transformer
The conversion of power supply, transmission between matter safety and immaterial safety circuit.Except above-mentioned resistance to electric clearance, creep age distance and power frequency
Beyond the requirement of pressure, signal and power supply after isolation also need to corresponding safety barrier circuit and carry out limitation energy, and so ability can
Intrinsically safe circuit is kept apart with non-intrinsically safe circuit by ground, can just meet intrinsicallysafecircuit design requirement.Therefore, for explosivity
A kind of safe and reliable, general analog video signal isolation is realized in the problem that environment electrical installation exists in design, design
Circuit, has important practical significance.
The content of the invention
The purpose of the present invention is, to overcome the weak point of prior art, to propose a kind of explosive atmosphere electrical installation
Analog video signal isolation circuit.Circuit of the present invention ensure that analog video signal inside explosive atmosphere electrical installation
Secure communication.
A kind of analog video signal isolation circuit of explosive atmosphere electrical installation proposed by the present invention, the circuit is by electricity
Source isolation module, analog video signal isolation module, lifting die block, boost module and three guard grating compositions；The power supply
The primary side of isolation module, the primary side of signal isolation module and lifting die block are both placed in non-security district, constitute non-peace
Full sub-circuit；The secondary side of the power isolation module, the first guard grating, boost module, the second guard grating, signal isolation module
Secondary side and the 3rd guard grating be both placed in place of safety, constitute safe sub-circuit；Wherein, outside power supply all the way with
The primary side connection of power isolation module, separately leads up to lifting die block and connects with the primary side of analog video signal isolation module
Connect；Power isolation module secondary side lead up to the first guard grating output isolation power supply, power isolation module it is secondary
Another road in side passes sequentially through the secondary side phase of second source boost module, the second guard grating and analog video signal isolation module
Even；The primary side of analog video signal isolation module is bi-directionally connected with non-security district analog video signal interface, analog video letter
The secondary side of number isolation module is bi-directionally connected with the 3rd guard grating one end, the 3rd guard grating other end and place of safety analog video letter
Number interface is bi-directionally connected.
The analog video signal isolation circuit of another explosive atmosphere electrical installation proposed by the present invention, the circuit by
Power isolation module, analog video signal isolation module, lifting die block, voltage reduction module and two guard grating compositions；The electricity
The primary side of source isolation module, the primary side of signal isolation module and lifting die block are both placed in non-security district, constitute non-
Safe sub-circuit；The secondary side of the power isolation module, the first guard grating, voltage reduction module, the secondary side of signal isolation module
And second guard grating be both placed in place of safety, constitute safe sub-circuit；Wherein, outside power supply all the way with isolated from power
The primary side connection of module, separately leads up to lifting die block and is connected with the primary side of analog video signal isolation module；Power supply
Isolation module secondary side exports isolation power supply by the first guard grating, and isolation power supply is regarded by voltage reduction module with simulation
The secondary side of frequency signal isolation module is connected；The primary side of analog video signal isolation module and non-security district analog video signal
Interface is bi-directionally connected, and the secondary side of analog video signal isolation module is bi-directionally connected with the 3rd guard grating one end, the 3rd guard grating
The other end is bi-directionally connected with place of safety analog video signal interface.
The invention has the characteristics that and beneficial effect：
Circuit of the present invention ensure that secure communication of the analog video signal inside explosive atmosphere electrical installation.In electricity
Magnetic isolation technology is used on source, optical coupling isolation technology is employed in data transfer, and combine safe gate technique so that should
Circuit form is simple, fast response time, security reliability high, circuit small volume, portable strong, can be used as in explosive atmosphere
The general scheme of analog video signal isolation circuit in electrical installation.
Brief description of the drawings
Fig. 1 is the first analog video signal isolation circuit schematic diagram proposed by the present invention.
Fig. 2 is another analog video signal isolation circuit schematic diagram proposed by the present invention.
Specific embodiment
Below in conjunction with drawings and Examples to a kind of analog video of explosive atmosphere electrical installation proposed by the present invention
Signal isolation circuit describes in detail as follows：
The first analog video signal isolation circuit proposed by the present invention is as shown in figure 1, the circuit is main by isolated from power
Module 1, analog video signal isolation module 2, lifting die block 3,4, three guard grating (5,6,7) compositions of boost module, it is described
The primary side of power isolation module 1, the primary side of signal isolation module 2 and lifting die block 3 are both placed in non-security district (such as
Inside the flame proof cabin of anti-explosion product), constitute non-security sub-circuit；The secondary side of the power isolation module 1, the first guard grating 5,
Boost module 4, the second guard grating 6, the secondary side of signal isolation module 2 and the 3rd guard grating 7 are both placed in place of safety (as prevented
The flame proof of quick-fried product portion out of my cabin), constitute safe sub-circuit；The annexation of each device is：
Primary side of the outside power supply all the way with power isolation module 1 is connected, to the primary side of power isolation module 1
Power supply；The another lifting die block 3 that leads up to is connected with the primary side of analog video signal isolation module 2, to analog video signal
The primary side of isolation module 2 is powered；Power supply electricity is isolated in the output of the first guard grating 5 that leads up to of the secondary side of power isolation module 1
Source, another road of secondary side of power isolation module 1 pass sequentially through boost module 4, the second guard grating 6 (according to《GB3836.4-
The part of 2010 explosive atmosphere the 4th：The equipment protected by essential safe type " i "》Requirement, voltage in safe sub-circuit rising
Needed again by guard grating after pressure, then powered to the secondary side of analog video isolation module, therefore the guard grating is set) with simulation
The secondary side of vision signal isolation module 2 is connected, and is that the secondary side of analog video signal isolation module 2 is powered；Analog video is believed
Number primary side of isolation module 2 is bi-directionally connected with the analog video signal interface of non-security district, analog video signal isolation module 2
Secondary side be bi-directionally connected with the one end of the 3rd guard grating 7, the analog video signal interface of the other end of the 3rd guard grating 7 and place of safety
It is bi-directionally connected, for the two-way isolation transmission of non-security district and place of safety analog video signal.
Another analog video signal isolation circuit proposed by the present invention is as shown in Fig. 2 the circuit is main by isolated from power
Module 1, analog video signal isolation module 2, lifting die block 3,8, two guard grating (5,7) compositions of voltage reduction module, the electricity
The primary side of source isolation module 1, the primary side of signal isolation module 2 and lifting die block 3 are both placed in non-security district (as anti-
Inside the flame proof cabin of quick-fried product), constitute non-security sub-circuit；The secondary side of the power isolation module 1, the first guard grating 5, drop
Die block 8, the secondary side of signal isolation module 2 and the second guard grating 7 are both placed in place of safety (such as flame proof cabin of anti-explosion product
It is outside), constitute safe sub-circuit；The annexation of each device is：
Primary side of the outside power supply all the way with power isolation module 1 is connected, to the primary side of power isolation module 1
Power supply, separately leads up to lifting die block 3 and is connected with the primary side of analog video signal isolation module 2, to analog video signal
The primary side of isolation module 2 is powered；The secondary side of power isolation module 1 exports isolation power supply, isolation by the first guard grating 5
Power supply is connected by voltage reduction module 8 with the secondary side of analog video signal isolation module 2, is analog video signal isolation mode
The secondary side of block 2 is powered；The primary side of analog video signal isolation module 2 is two-way with the analog video signal interface of non-security district
It is connected, the secondary side of analog video signal isolation module 2 is bi-directionally connected with the one end of the second guard grating 7, the other end of the second guard grating 7
Analog video signal interface with place of safety is bi-directionally connected, for the two-way isolation of non-security district and place of safety analog video signal
Transmission.
The function and specific implementation of each device of the invention are respectively described below：
Power isolation module of the present invention 1 is used to produce the safe voltage of isolation, using Magnetic isolation mode, by rising
The both sides of voltage reduction module 3, boost module 4 or voltage reduction module 8 respectively to analog video signal isolation module 2 power.The power supply
Isolation module 1 can use transformer or DCDC isolation modules, and be tested by corresponding industrial frequency withstand voltage.
Analog video signal isolation module 2 of the present invention is used to isolate analog video signal, is isolated using optical coupling
Mode, selects the bandwidth range of chip to need to match with passed video format, similarly, to be tried by corresponding industrial frequency withstand voltage
Test.Analog video signal positioned at non-security district is connected with the primary side of analog video signal isolation module 2, from analog video letter
The secondary side output of number isolation module 2, and the analog video signal positioned at place of safety is exported by the 3rd safety barrier circuit 7；Instead
It, the analog video signal positioned at place of safety also can enter the secondary of analog video signal isolation module 2 by the 3rd guard grating 7
Side, obtains being located at the analog video signal of non-security district from the primary side output of the analog video signal isolation module 2, has constituted
The two-way isolation transmission of whole analog video signal.Analog video signal isolation module is using AVAGO companies in the present embodiment
HCNW4562 chips.
Lifting die block 3 of the present invention, boost module 4 and voltage reduction module 8, give analog video signal isolation mode respectively
The both sides of block 2 power, and both sides voltage is related to optical coupling gain, and according to actual conditions, magnitude of voltage may be different.From optocoupler
Said in the principle of chip, opto-coupler chip two ends are the communication of light, and the supply voltage at two ends can be with difference, can be according to actual increasing
Beneficial effect adjusts the magnitude of voltage at two ends, because the input of power isolation module 1 and output adjustable range are limited and dumb,
So providing lifting die block respectively to the two ends of analog video signal isolation module 2.The present embodiment uses Ti companies LM2735 cores
Piece and peripheral circuit as boost module, using the LM2841 chips and peripheral circuit of Ti companies as voltage reduction module, to provide
The voltage at analog video signal isolation module two ends.
Guard grating of the present invention 5,6 and 7, its basic role is by limiting electric current and voltage so that in abnormal shape
In the state of condition, such as short circuit, the energy that safe sub-circuit portion is discharged is in safely controllable scope.Guard grating can be used can
The Series Parallel Elements such as the current-limiting resistance, quick irrecoverable fuse, the Zener diode that lean on are realized.Its principle is using reliable
Current-limiting resistance limitation flows into the electric current of safe sub-circuit, and the voltage on safe sub-circuit is applied to using Zener diode limitation,
And when there is dangerous voltage, before Zener diode short circuit, circuit, wherein current limliting electricity are shut off using fastp-acting fuse
Hinder the quantity and the quantity of Zener diode of unit need according to the explosive-proof grade of electrical equipment it is different depending on.It is of the present invention
Guard grating 5,6 is different with the circuit position corresponding to 7, and operating voltage may be different, and difference is likely in form and parameter.This reality
Apply example the first guard grating 5 employ series connection one quick irrecoverable fuse, then Liao Liangge Ti companies of connecting TPS2552
(cut-off current of the current-limiting resistance unit is explosion-proof etc. according to electrical equipment used as current-limiting resistance unit for current limliting chip and peripheral circuit
Depending on level and virtual voltage), (this is neat for two magnitude of voltage Zener diodes corresponding with electrical equipment virtual voltage of last parallel connection
Receive diode a model selection nominal level bigger than virtual voltage as far as possible model).Second guard grating 6 of the present embodiment
One quick irrecoverable fuse of series connection is employed, further according to virtual voltage situation, series connection Liang Ge Ti companies is have selected
(cut-off current of the current-limiting resistance unit is according to electrically setting used as current-limiting resistance unit for TPS25921A current limlitings chip and peripheral circuit
Depending on standby explosive-proof grade and virtual voltage), two magnitude of voltage Zeners corresponding with electrical equipment virtual voltage of last parallel connection
Diode (model of the Zener diode selects the model of a nominal level bigger than virtual voltage as far as possible).The present embodiment
3rd guard grating 7 employ series connection one quick irrecoverable fuse, then connected a current-limiting resistance (current-limiting resistance
Depending on cut-off current is according to the explosive-proof grade and virtual voltage of electrical equipment), last in parallel two magnitudes of voltage and electrical equipment reality
The corresponding Zener diode of border voltage (the model selection of the Zener diode bigger than a virtual voltage nominal level as far as possible
Model).
Operation principle of the invention is：The power supply of integrated circuit is by non-security sub-circuit portion to safe sub-circuit portion
Point, analog video signal being actually needed according to circuit part, from non-security sub-circuit portion isolation transmit to safety son
Circuit part, or transmitted to non-security sub-circuit portion from the isolation of safe sub-circuit portion；Wherein, lifting die block 3, boosting
Module 4 (or voltage reduction module 8) ensure that the normal work of analog video signal isolation module 2；Each guard grating common guarantee
When the power supply of analog video signal isolation module 2 and analog video signal are transmitted, the voltage of safe sub-circuit, electric current will not surpass
Cross the limit value of requirement of explosion proof, if therefore when equipment such as is short-circuited at the failure, it can be ensured that what safe sub-circuit portion was discharged
Energy in safely controllable scope, so as to ensure that overall signal transmission security.
Claims (2)
1. a kind of analog video signal isolation circuit of explosive atmosphere electrical installation, it is characterised in that the electric routing power
Isolation module, analog video signal isolation module, lifting die block, boost module and three guard grating compositions；The power supply every
Primary side, the primary side of signal isolation module and lifting die block from module are both placed in non-security district, constitute non-security
Sub-circuit；The secondary side of the power isolation module, the first guard grating, boost module, the second guard grating, signal isolation module
Secondary side and the 3rd guard grating are both placed in place of safety, constitute safe sub-circuit；Wherein, outside power supply all the way with electricity
The primary side connection of source isolation module, separately leads up to lifting die block and connects with the primary side of analog video signal isolation module
Connect；Power isolation module secondary side lead up to the first guard grating output isolation power supply, power isolation module it is secondary
Another road in side passes sequentially through the secondary side phase of second source boost module, the second guard grating and analog video signal isolation module
Even；The primary side of analog video signal isolation module is bi-directionally connected with non-security district analog video signal interface, analog video letter
The secondary side of number isolation module is bi-directionally connected with the 3rd guard grating one end, the 3rd guard grating other end and place of safety analog video letter
Number interface is bi-directionally connected.
2. a kind of analog video signal isolation circuit of explosive atmosphere electrical installation, it is characterised in that the electric routing power
Isolation module, analog video signal isolation module, lifting die block, voltage reduction module and two guard grating compositions；The power supply every
Primary side, the primary side of signal isolation module and lifting die block from module are both placed in non-security district, constitute non-security
Sub-circuit；The secondary side of the power isolation module, the first guard grating, voltage reduction module, the secondary side of signal isolation module and
Second guard grating is both placed in place of safety, constitutes safe sub-circuit；Wherein, outside power supply all the way with power isolation module
Primary side connection, separately lead up to lifting die block be connected with the primary side of analog video signal isolation module；Isolated from power
Module secondary side exports isolation power supply by the first guard grating, and isolation power supply is believed by voltage reduction module with analog video
The secondary side of number isolation module is connected；The primary side of analog video signal isolation module and non-security district analog video signal interface
It is bi-directionally connected, the secondary side of analog video signal isolation module is bi-directionally connected with the 3rd guard grating one end, the 3rd guard grating is another
End is bi-directionally connected with place of safety analog video signal interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710016331.8A CN106851048B (en) | 2017-01-10 | 2017-01-10 | Analog video signal isolation circuit of electrical equipment for explosive environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710016331.8A CN106851048B (en) | 2017-01-10 | 2017-01-10 | Analog video signal isolation circuit of electrical equipment for explosive environment |
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| Publication Number | Publication Date |
|---|---|
| CN106851048A true CN106851048A (en) | 2017-06-13 |
| CN106851048B CN106851048B (en) | 2023-07-21 |
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| CN201710016331.8A Active CN106851048B (en) | 2017-01-10 | 2017-01-10 | Analog video signal isolation circuit of electrical equipment for explosive environment |
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| CN206542483U (en) * | 2017-01-10 | 2017-10-03 | 北京中安科创科技发展有限公司 | A kind of analog video signal isolation circuit of explosive atmosphere electrical installation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040084608A1 (en) * | 2002-10-31 | 2004-05-06 | Maier Lawrence Carl | Active safety barrier circuit |
| CN1588474A (en) * | 2004-08-13 | 2005-03-02 | 浙江中控技术股份有限公司 | Wood safety anti-explosion interface device |
| WO2013110296A1 (en) * | 2012-01-27 | 2013-08-01 | Pepperl + Fuchs Gmbh | Device for the intrinsically safe supply, control and/or evaluation of field devices in the explosion-proof area |
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| Publication number | Publication date |
|---|---|
| CN106851048B (en) | 2023-07-21 |
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