CN206542483U - 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
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- CN206542483U CN206542483U CN201720025205.4U CN201720025205U CN206542483U CN 206542483 U CN206542483 U CN 206542483U CN 201720025205 U CN201720025205 U CN 201720025205U CN 206542483 U CN206542483 U CN 206542483U
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- video signal
- analog video
- module
- isolation module
- signal isolation
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Abstract
The utility model is related to a kind of analog video signal isolation circuit of explosive atmosphere electrical installation, belongs to safety in production and ensures apparatus field；Including power isolation module, analog video signal isolation module, lifting die block, boost module and three guard gratings；Power isolation module and signal isolation module primary side, lifting die block are respectively positioned on non-security district；Power isolation module and signal isolation module secondary side, 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, and another road is connected by lifting die block 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 is connected by boost module, the second guard grating with analog video signal isolation module secondary side；Analog video signal isolation module is bi-directionally connected with the 3rd guard grating.The utility model can solve the problems, such as the electrical equipment essential safety that analog video signal communicates in explosive atmosphere.
Description
Technical field
The utility model belongs to safety in production and ensures apparatus field, more particularly to a kind of explosive atmosphere electrical installation
Analog video signal isolation circuit.
Background technology
With the development of the society, the development of science and technology, the electrical equipment 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
It may be exposed in explosive atmosphere, if design is improper so that situations such as lower generation of nonserviceabling is struck sparks, overheated, will
Cause potential dangerous 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 a variety of anti-explosion electrics such as many kinds, including essential safe type, flame-proof type, INCREASEDSAFETY
Road design form, while a kind of intrinsically safe circuit design of equipment can also mix and use a variety of 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, necessary circuit parameter in equipment, the electricity ginseng such as electric current, voltage, energy storage
Number, or the non-electrical parameter such as mechanical rotation, radiation, temperature is when can not meet the design parameter requirement of intrinsicallysafecircuit, just need
Change or increase intrinsically safe circuit form, 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 experiment answered.
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 powered to essential safety end with non-intrinsically safe safe end, and this can be realized using isolating transformer
Conversion, the transmission of power supply 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 of environment electrical installation exists in design, design
Circuit, has important practical significance.
Utility model content
The purpose of this utility model is to overcome the weak point of prior art, to propose a kind of explosive atmosphere with electrically setting
Standby analog video signal isolation circuit.The utility model circuit ensure that analog video signal in explosive atmosphere with electrically setting
Standby internal secure communication.
The utility model proposes a kind of explosive atmosphere electrical installation analog video signal isolation circuit, the circuit
It is made up of power isolation module, analog video signal isolation module, lifting die block, boost module and three guard gratings；It is described
Primary side, the primary side of signal isolation module and the lifting die block of power isolation 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
The secondary side of module and the 3rd guard grating are both placed in place of safety, constitute safe sub-circuit；Wherein, outside power supply one
The primary side connection of road and power isolation module, another road is by lifting die block and analog video signal isolation module once
Side is connected；Power supply is isolated in being exported all the way by the first guard grating for power isolation module secondary side, power isolation module
Another road of secondary side passes sequentially through the secondary side of second source boost module, the second guard grating and analog video signal isolation module
It is connected；The primary side of analog video signal isolation module is bi-directionally connected with non-security district analog video signal interface, analog video
The secondary side of signal 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
Signaling interface is bi-directionally connected.
The utility model proposes another explosive atmosphere electrical installation analog video signal isolation circuit, the electricity
Routing power isolation module, analog video signal isolation module, lifting die block, voltage reduction module and two guard grating compositions；Institute
The primary side, the primary side of signal isolation module and lifting die block for stating power isolation module are both placed in non-security district, structure
Into non-security sub-circuit；The secondary side of the power isolation module, the first guard grating, voltage reduction module, the two of signal isolation module
Secondary side and the second guard grating are both placed in place of safety, constitute safe sub-circuit；Wherein, outside power supply all the way with power supply
The primary side connection of isolation module, another road is connected by lifting die block with the primary side of analog video signal isolation module；
Power isolation module secondary side passes through voltage reduction module and mould by the first guard grating output isolation power supply, isolation power supply
The secondary side for intending vision signal isolation module is connected；The primary side of analog video signal isolation module and non-security district analog video
Signaling 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 peace
The full grid other end is bi-directionally connected with place of safety analog video signal interface.
The utility model has the characteristics that and beneficial effect：
The utility model circuit ensure that secure communication of the analog video signal inside explosive atmosphere electrical installation.
Magnetic isolation technology is used on power supply, optical coupling isolation technology is employed in data transfer, and combines safe gate technique, is made
Obtain the simple circuit form, fast response time, security reliability height, circuit small volume, portability by force, can be used as in explosivity
The general scheme of analog video signal isolation circuit in environment electrical installation.
Brief description of the drawings
Fig. 1 be the utility model proposes the first analog video signal isolation circuit schematic diagram.
Fig. 2 be the utility model proposes another analog video signal isolation circuit schematic diagram.
Embodiment
Below in conjunction with drawings and Examples to the utility model proposes a kind of explosive atmosphere electrical installation simulation
Vision signal isolation circuit describes in detail as follows：
The utility model proposes the first analog video signal isolation circuit as shown in figure 1, the circuit is main by power supply
Isolation module 1, analog video signal isolation module 2, lifting die block 3, boost module 4, three guard grating (5,6,7) compositions,
Primary side, the primary side of signal isolation module 2 and the lifting die block 3 of the power isolation module 1 are both placed in non-security
Area (inside the flame proof cabin of such as anti-explosion product), constitutes non-security sub-circuit；The secondary side of the power isolation module 1, the first peace
Full grid 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 safety
Area's (flame proof of such as anti-explosion product out of my cabin portion), constitutes 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, the primary side to power isolation module 1
Power supply；Another road is connected by lifting die block 3 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 first guard grating 5 output that passes through all the way 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, the voltage in safe sub-circuit rising
Need to pass through guard grating again after pressure, then powered to the secondary side of analog video isolation module, therefore the guard grating is set) with simulating
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 and the analog video signal interface of non-security district are bi-directionally connected, 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, the two-way isolation for non-security district and place of safety analog video signal is transmitted.
The utility model proposes another analog video signal isolation circuit as shown in Fig. 2 the circuit is main by power supply
Isolation module 1, analog video signal isolation module 2, lifting die block 3, voltage reduction module 8, two guard grating (5,7) compositions, institute
The primary side, the primary side of signal isolation module 2 and lifting die block 3 for stating power isolation module 1 are both placed in non-security district
(inside the flame proof cabin of such as anti-explosion product), constitutes non-security sub-circuit；The secondary side of the power isolation module 1, the first safety
Grid 5, voltage reduction module 8, the secondary side of signal isolation module 2 and the second guard grating 7 are both placed in place of safety (such as anti-explosion product
Flame proof 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, the primary side to power isolation module 1
Power supply, another road is connected by lifting die block 3 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 passes through the first guard grating 5 output isolation power supply, isolation
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 and the analog video signal interface of non-security district are two-way
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
It is bi-directionally connected with the analog video signal interface of place of safety, the two-way isolation for non-security district and place of safety analog video signal
Transmission.
The function and specific implementation of each device of the present utility model are respectively described below：
Power isolation module 1 described in the utility model is used for the safe voltage for producing isolation, using Magnetic isolation mode, leads to
The both sides of lifting die block 3, boost module 4 or voltage reduction module 8 respectively to analog video signal isolation module 2 are crossed to power.Should
Power 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 described in the utility model is used to isolate analog video signal, using optical coupling
Isolation method, the bandwidth range of selection chip needs to match with passed video format, similarly, resistance to by corresponding power frequency
Pressure experiment.Analog video signal positioned at non-security district is connected with the primary side of analog video signal isolation module 2, is regarded from simulation
The secondary side output of frequency signal isolation module 2, and the analog video letter positioned at place of safety is exported by the 3rd safety barrier circuit 7
Number；Conversely, the analog video signal positioned at place of safety also can enter analog video signal isolation module 2 by the 3rd guard grating 7
Secondary side, obtain the analog video signal positioned at non-security district from the output of the primary side of the analog video signal isolation module 2,
Constitute the two-way isolation transmission of complete analog video signal.Analog video signal isolation module uses AVAGO in the present embodiment
The HCNW4562 chips of company.
Lifting die block 3 described in the utility model, boost module 4 and voltage reduction module 8, respectively to analog video signal every
Both sides from module 2 power, and both sides voltage is related to optical coupling gain, and according to actual conditions, magnitude of voltage may be different.From
Said in the principle of opto-coupler chip, opto-coupler chip two ends are the communication of light, and the supply voltage at two ends can be different, can be according to reality
Gain effect adjust two ends magnitude of voltage, due to power isolation module 1 input and output adjustable range it is limited and ineffective
It is living, so providing lifting die block respectively to the two ends of analog video signal isolation module 2.The present embodiment uses Ti companies LM2735
Chip and peripheral circuit are as boost module, using the LM2841 chips and peripheral circuit of Ti companies as voltage reduction module, to carry
For the voltage at analog video signal isolation module two ends.
Guard grating 5,6 and 7 described in the utility model, its basic role is by limiting electric current and voltage so that different
In the state of normal situation, such as short circuit, the energy that safe sub-circuit portion is discharged is in safely controllable scope.Guard grating can be adopted
Realized with the Series Parallel Elements such as reliable current-limiting resistance, quick irrecoverable fuse, Zener diode.Its principle is using can
The current-limiting resistance limitation leaned on flows into the electric current of safe sub-circuit, and the electricity being applied on safe sub-circuit is limited using Zener diode
Pressure, and when there is dangerous voltage, before Zener diode short circuit, circuit is shut off using fastp-acting fuse, wherein limiting
The quantity of the quantity of leakage resistance unit and Zener diode need according to the explosive-proof grade of electrical equipment it is different depending on.This practicality is new
Guard grating 5,6 described in type is different with the circuit position corresponding to 7, and operating voltage may be different, may also in form and parameter
It is different.First guard grating 5 of the present embodiment employs one quick irrecoverable fuse of series connection, then Liao Liangge Ti companies of connecting
TPS2552 current limlitings chip and peripheral circuit as current-limiting resistance unit, (cut-off current of the current-limiting resistance unit is according to electrically setting
Depending on standby explosive-proof grade and virtual voltage), two magnitudes of voltage of last parallel connection Zener corresponding with electrical equipment virtual voltage
Diode (model of the Zener diode selects the model of a nominal level bigger than virtual voltage as far as possible).The present embodiment
Second guard grating 6 employs one quick irrecoverable fuse of series connection, further according to virtual voltage situation, have selected series connection two
The TPS25921A current limlitings chip and peripheral circuit of Ti companies are used as current-limiting resistance unit (the cut-off current root of the current-limiting resistance unit
Depending on the explosive-proof grade and virtual voltage of electrical equipment), two magnitudes of voltage of last parallel connection and electrical equipment virtual voltage phase
The Zener diode answered (model of the Zener diode selects the model of a nominal level bigger than virtual voltage as far as possible).This
3rd guard grating 7 of embodiment employs one quick irrecoverable fuse of series connection, then current-limiting resistance (limit of having connected
Depending on explosive-proof grade and virtual voltage of the cut-off current of leakage resistance according to electrical equipment), last two magnitudes of voltage in parallel and electricity
The corresponding Zener diode of gas equipment virtual voltage (mark for one bigger than virtual voltage as far as possible by the model selection of the Zener diode
Claim the model of grade).
Operation principle of the present utility model is：The power supply of integrated circuit is by non-security sub-circuit portion to safe sub-circuit
Part, analog video signal being actually needed according to circuit part, from non-security sub-circuit portion isolation transmit to safety
Sub-circuit portion, or transmitted from the isolation of safe sub-circuit portion to non-security sub-circuit portion；Wherein, lifting die block 3, liter
Die block 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 transmission, voltage, the electric current of safe sub-circuit will not
More than the limit value of requirement of explosion proof, if therefore when the failure such as short circuit occurs for equipment, it can be ensured that safe sub-circuit portion is discharged
Energy in safely controllable scope so that 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 analog video signal isolation module and lifting die block from module are both placed in non-security district, structure
Into non-security sub-circuit；The secondary side of the power isolation module, the first guard grating, boost module, the second guard grating, simulation are regarded
The secondary side and the 3rd guard grating of frequency signal isolation module are both placed in place of safety, constitute safe sub-circuit；Wherein, it is outside
Power supply is connected with the primary side of power isolation module all the way, and another road is isolated by lifting die block with analog video signal
The primary side connection of module；Power supply, power supply are isolated in the first guard grating output that passes through all the way of power isolation module secondary side
Another road of secondary side of isolation module passes sequentially through second source boost module, the second guard grating and analog video signal isolation mode
The secondary side of block is connected；The primary side of analog video signal isolation module and the two-way company of non-security district analog video signal interface
Connect, the secondary side of analog video signal isolation module is bi-directionally connected with the 3rd guard grating one end, the 3rd guard grating other end and peace
Whole district's analog video signal 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 analog video signal isolation module and lifting die block from module are both placed in non-security district, structure
Into non-security sub-circuit；The secondary side of the power isolation module, the first guard grating, voltage reduction module, analog video signal isolation
The secondary side of module and the second guard grating are both placed in place of safety, constitute safe sub-circuit；Wherein, outside power supply one
The primary side connection of road and power isolation module, another road is by lifting die block and analog video signal isolation module once
Side is connected；Power isolation module secondary side passes through decompression by the first guard grating output isolation power supply, isolation power supply
Module is connected with the secondary side of analog video signal isolation module；The primary side and non-security district of analog video signal isolation module
Analog video signal interface is bi-directionally connected, the secondary side of analog video signal isolation module and the 3rd two-way company in guard grating one end
Connect, the 3rd guard grating other end is bi-directionally connected with place of safety analog video signal interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720025205.4U CN206542483U (en) | 2017-01-10 | 2017-01-10 | A kind of analog video signal isolation circuit of explosive atmosphere electrical installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720025205.4U CN206542483U (en) | 2017-01-10 | 2017-01-10 | A kind of analog video signal isolation circuit of explosive atmosphere electrical installation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206542483U true CN206542483U (en) | 2017-10-03 |
Family
ID=59938760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720025205.4U Withdrawn - After Issue CN206542483U (en) | 2017-01-10 | 2017-01-10 | A kind of analog video signal isolation circuit of explosive atmosphere electrical installation |
Country Status (1)
| Country | Link |
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| CN (1) | CN206542483U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851048A (en) * | 2017-01-10 | 2017-06-13 | 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 |
-
2017
- 2017-01-10 CN CN201720025205.4U patent/CN206542483U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851048A (en) * | 2017-01-10 | 2017-06-13 | 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 |
| CN106851048B (en) * | 2017-01-10 | 2023-07-21 | 北京中安科创科技发展有限公司 | Analog video signal isolation circuit of electrical equipment for explosive environment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20171003 Effective date of abandoning: 20230721 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20171003 Effective date of abandoning: 20230721 |