CN109462212A - A kind of adjustable intrinsic safety electric source rear end stop type protection circuit of analogue type guard time - Google Patents
A kind of adjustable intrinsic safety electric source rear end stop type protection circuit of analogue type guard time Download PDFInfo
- Publication number
- CN109462212A CN109462212A CN201811336888.0A CN201811336888A CN109462212A CN 109462212 A CN109462212 A CN 109462212A CN 201811336888 A CN201811336888 A CN 201811336888A CN 109462212 A CN109462212 A CN 109462212A
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- Prior art keywords
- circuit
- cut
- intrinsic safety
- discharge time
- electric source
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of adjustable intrinsic safety electric source rear end stop type protection circuits of analogue type guard time, including power loss pressure and overcurrent sensing circuit, cut-off discharge time adjustment circuit, fast driving and self-repairing circuit and cut-off protective switch pipe；The power loss pressure and overcurrent sensing circuit are connected to the output end of intrinsic safety electric source, judge that short trouble occurs for output end；The cut-off discharge time adjustment circuit is pressed with the power loss and overcurrent sensing circuit is connect; the fast driving and self-repairing circuit are connect with the cut-off discharge time adjustment circuit, and the fast driving and self-repairing circuit are connect by the cut-off protective switch pipe with power input.The present invention is monitored output Current Voltage using comparator, after identify failure within the set time disconnecting circuit to guarantee the performance of intrinsically safe power supply.And since output loop does not have string resistance current limliting, whole efficiency is obviously improved.And the present invention has the adjustable function of guard time.
Description
Technical field
The present invention relates to a kind of intrinsic safety electric source rear end stop type protection circuit, specially a kind of analogue type and guard time
Adjustable intrinsically safe power supply rear end stop type protection circuit.
Technical background
With the inflammable and explosive hazardous area mechanization such as coal mine, petroleum, chemical industry, weaving, gold-plated, automation and information-based journey
The raising of degree, electrical equipment obtains quick promotion and application, and is related to the production, processing and fortune of all kinds of combustible and explosive articles
During defeated and storage, all along with the birth in inflammable and explosive hazardous area region, according to state compulsion standard GB3836.1-
2010, the electrical equipment applied to hazardous area region must have corresponding equipment protection rank.Essential safe type phase
It is high reliablity, small in size, light-weight and easy to maintain for other type of explosion proof construc tion, and it is easily achieved higher essential safety
Equipment protection rank.Intrinsically safe power supply rear end protected mode is divided into constant-current type, subtracts flow pattern and the type that shuts off at present.Relative to preceding
Electric current can be reduced to zero rapidly in transcient short circuit time, ensure that set to the full extent by two kinds of protected modes, the type that shuts off protection circuit
Standby safety.The property protection circuit of intrinsic safety electric source rear end cut-off at present is broadly divided into numeric type and two kinds of analogue type, numeric type protection
The general operating time of protection of circuit easily adjusts, but due to the presence in controller clock period, operating time of protection is longer, equipment
A possibility that impaired, is higher.Analogue type protection circuit protection speed is fast but operating time of protection is generally non-adjustable, makes in different
It is not high with relevance grade in occasion or experimental study, it is badly in need of a kind of analogue type at present and the adjustable intrinsic safety electric source rear end of guard time is protected
The appearance of shield cut-off property protection circuit.
Summary of the invention
Goal of the invention: in order to solve the above technical problem, the present invention provides a kind of analogue type and guard time adjustable
Matter safety type power rear end stop type protection circuit.
Technical solution:
A kind of adjustable intrinsic safety electric source rear end stop type protection circuit of analogue type guard time, including power loss pressure and overcurrent
Detection circuit, cut-off discharge time adjustment circuit, fast driving and self-repairing circuit and cut-off protective switch pipe；The power loss
Pressure and overcurrent sensing circuit are connected to the output end of intrinsic safety electric source, judge that short trouble occurs for output end；The power loss pressure inspection
Slowdown monitoring circuit is connected in parallel on the output end of the intrinsic safety electric source, and the output that the overcurrent sensing circuit is connected on the intrinsic safety electric source is returned
On in road, the voltage on inspection leakage resistance that is connected in output loop by it determines to export size of current；The cut-off is put
Electric time adjusting circuit is pressed with the power loss and overcurrent sensing circuit is connect, the fast driving and self-repairing circuit with it is described
End the connection of discharge time adjustment circuit, the fast driving and self-repairing circuit pass through the cut-off protective switch pipe and power supply
Input connection；It is preset with cut-off discharge time magnitude in the cut-off discharge time adjustment circuit, short circuit occurs in output end
Fault time sends a signal to the fast driving and self-repairing circuit when reaching preset cut-off discharge time magnitude；It is described fast
Fast driving circuit drives the cut-off protective switch pipe to cut off circuit rapidly.
The intrinsic safety is adjusted by adjusting cut-off discharge time magnitude preset in the cut-off discharge time adjustment circuit
The guard time of power supply rear end stop type protection circuit.
The power loss pressure and overcurrent sensing circuit are by two LM311 voltage comparator chip U1And U2, divider resistance Rs1
And Rs2And current sense resistor RsComposition；The LM311 voltage comparator U1And U2Output end be connected directly and realize line and logic
Function；Wherein, Vcc1 is the comparator chip U1And U2Supply voltage is provided, through resistance R2、R3、R4It is mentioned to comparator input terminal
For reference voltage value UurefAnd Uiref, through pull-up resistor R5So that UAExport high level.
The cut-off discharge time adjustment circuit uses LTC6994；Its SET pin passes through resistor RSETGround connection, is responsible for setting
Set the inside master oscillator frequency of LTC6994；DIV pin and V+Pins in parallel has capacitor C1With resistance R1, series resistance again later
R2After be grounded.
The setting of cut-off discharge time in the cut-off discharge time adjustment circuit is determined by formula (1):
Wherein, RsetFor the resistance that internal master oscillator frequency is arranged；NDIVInternal clocking frequency divider divider ratio setting value, by
Resistance R1And R2Setting determine.
The fast driving and self-repairing circuit use NE555 timing chip U4；Wherein Vcc2 is the NE555 timing core
Piece U4Supply voltage is provided, R is passed throughT、CTThe self- recoverage time is set, through pull-up resistor R1Draw high chip output level；S1For P ditch
Road MOSFET protective switch pipe, S2For N-channel MOS FET auxiliary switch, two pipes connect and compose totem, accelerate to protect
Protect switching tube S1Turn-off speed.
The utility model has the advantages that
1. existing protection circuit is generally by the way of voltage-stabiliser tube and current-limiting resistance, voltage-stabiliser tube is connected in parallel on output loop,
Guarantee output voltage.When input voltage failure, voltage-stabiliser tube parallel branch work long hours over-voltage is easy to cause voltage-stabiliser tube to damage, limit
The intrinsic safety electric source service life processed.Current-limiting resistance is gone here and there always in output loop, and intrinsic safety electric source efficiency is seriously affected, and also has one to output power
Fixed limitation.The present invention is monitored output Current Voltage using comparator, disconnects within the set time after identifying failure
Circuit is to guarantee the performance of intrinsically safe power supply.And since output loop does not have string resistance current limliting, whole efficiency is obtained
It is obviously improved.
2. protecting circuit compared to numeric type, this circuit uses analogue type device, has lacked digitial controller cycle time, ends
Guard time is shorter, and according to essential safety theory, the circuit spark discharge time is shorter can further to promote intrinsic safety electric source efficiency.
3. the present invention has the adjustable function of guard time, different use occasions and intrinsic safety theoretical research are tested
Card is of great significance.
Detailed description of the invention
Fig. 1 is intrinsic safety electric source rear end stop type protection circuit integral experiment circuit block diagram of the invention.
Fig. 2 power loss pressure and overcurrent sensing circuit figure.
Fig. 3 is cut-off discharge time adjustment circuit figure.
Fig. 4 is fast driving and self-repairing circuit figure.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
Fig. 1 is intrinsic safety electric source rear end stop type protection circuit integral experiment circuit block diagram of the invention.As shown in Figure 1, this
The intrinsic safety electric source rear end stop type protection circuit integral experiment circuit of invention includes that power loss pressure and overcurrent sensing circuit, cut-off are put
Electric time adjusting circuit, fast driving and self-repairing circuit and cut-off protective switch pipe.The power loss pressure and overcurrent detection
It is electrically connected to the output end of intrinsic safety electric source, the output end for losing voltage detecting circuit and being connected in parallel on the intrinsic safety electric source is described
On overcurrent sensing circuit is connected in the output loop of the intrinsic safety electric source, the inspection galvanic electricity that is connected on by it in output loop
Voltage in resistance determines to export size of current；The cut-off discharge time adjustment circuit and the power loss are pressed and overcurrent detects
Circuit connection, the fast driving and self-repairing circuit are connect with the cut-off discharge time adjustment circuit, the fast driving
And self-repairing circuit is connect by the cut-off protective switch pipe with power input.When short trouble occurs for circuit, the power loss
Pressure and overcurrent sensing circuit quickly detect the output end of the intrinsic safety electric source, judge that short trouble occurs for output end, when reaching
The cut-off discharge time magnitude that the cut-off discharge time adjustment circuit is arranged in high-precision large-range, issues signal in turn again
It drives the cut-off protective switch pipe to cut off circuit rapidly by the fast drive circuit, guarantees the essential safety performance of circuit.
Spark discharge voltage moment, which drops to, in typical cut-off type ECL circuit waveform builds arc voltage, spark discharge electric current
Rated value is quickly risen above, therefore power loss pressure and overcurrent sensing circuit are designed according to this feature, as shown in Figure 2.The present invention
Power loss pressure and overcurrent sensing circuit by two LM311 voltage comparator chip U1And U2, divider resistance Rs1And Rs2And electric current
Detection resistance RsComposition；Comparator U1And U2Output end, which is connected directly, realizes line and logic function；Vcc1 provides for comparator chip
Supply voltage, through resistance R2、R3、R4Reference voltage value U is provided to comparator input terminalurefAnd Uiref, through pull-up resistor R5So that
UAExport high level.
Its concrete operating principle are as follows: under normal circumstances, through divider resistance Rs1And Rs2Obtained sampling presses UusIt is greater than
Uuref, through current sense resistor RsObtained sampled voltage UisLess than reference voltage Uiref, comparator output terminal U at this timeAFor high electricity
It is flat；When short trouble occurs, output end voltage moment, which drops to, builds arc voltage, and electric current quickly rises above rated value, then through dividing
Piezoresistance Rs1And Rs2Obtained sampling presses UusLess than Uuref, through current sense resistor RsObtained sampled voltage UisGreater than base
Quasi- voltage Uiref, comparator output terminal U at this timeAFor low level.It is possible thereby to detect whether to send short trouble.
Fig. 3 is cut-off discharge time adjustment circuit figure.As shown in figure 3, cut-off discharge time adjustment circuit of the invention is selected
A delay chip LTC6994 produced with Linear Techn Inc..LTC6994 is a programmable delay module, has 1 μ s extremely
33.6s reference time delay.Its SET pin passes through resistor RSETGround connection is responsible for the inside master oscillator frequency of setting LTC6994；
DIV pin and V+Pins in parallel has capacitor C1With resistance R1, series resistance R again later2After be grounded.LTC6994 is under the jurisdiction of
TImerBloxTMUniversal silicon timing device series, single resistor RsetIt is responsible for the inside master oscillator frequency of setting LTC6994
Rate, input to output delay time tDELAYBy the master oscillator and an internal clocking frequency divider NDIVTo determine (to be programmable to 1
~2218 setting values in range).NDIVPass through resistance R1And R2Setting determine.
Wherein, RsetFor the resistance that internal master oscillator frequency is arranged；NDIVInternal clocking frequency divider divider ratio setting value；
The setting of cut-off discharge time is determined that wherein table 1 defines resistance R by formula (1)1、R2And NDIVValue relationship.
By the way that resistance R is arranged1、R2It can determine POL value, when POL is 0, rising edge delay；When POL is 1, failing edge delay.By
This, can be arranged cut-off discharge time magnitude in high-precision large-range.
1 resistance R of table1、R2And NDIVAnd the value relation table of POL
Fig. 4 is fast driving and self-repairing circuit figure.As shown in figure 4, fast driving of the invention and self-repairing circuit choosing
It is NE555 timing chip U4, so that it is constituted pulse-triggered type monostable circuit by building for peripheral circuit.Wherein Vcc2 gives
Chip U4Supply voltage is provided, R is passed throughT、CTThe self- recoverage time is set, through pull-up resistor R1Draw high chip output level；S1For P
Channel mosfet protective switch pipe, S2For N-channel MOS FET auxiliary switch, two pipes connect and compose totem, accelerate
Protective switch pipe S1Turn-off speed.
tr=1.1RT×CT (2)
Self- recoverage time trSetting such as formula (2) shown in.The specific working principle is as follows for circuit: when normal work, through examining
Slowdown monitoring circuit and the U of cut-off discharge time adjustment circuit outputBSignal is high level, is inputted 2 pin of chip, and chip output is
Low level, protective switch pipe S1Conducting, auxiliary switch S2Shutdown, circuit normally export；When short trouble occurs, through detection electricity
The U of road and cut-off discharge time adjustment circuit outputBSignal becomes low level from high level, is inputted 2 pin of chip, chip
Output is changed into high level, auxiliary switch S by low level immediately2Conducting, drain charge are released to auxiliary switch source electrode rapidly
It puts, so that protective switch pipe S1Grid and drain potential difference are drawn high rapidly, and protective switch pipe immediately turns off；Reach when the turn-off time
When the self- recoverage time, chip output is changed into low level, circuit restarting, if short trouble always exists by high level
It repeats above-mentioned protection process and is again switched off protective switch pipe, until short trouble releases.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of adjustable intrinsic safety electric source rear end stop type protection circuit of analogue type guard time, it is characterised in that: including power loss
Pressure and overcurrent sensing circuit, cut-off discharge time adjustment circuit, fast driving and self-repairing circuit and cut-off protective switch
Pipe；The power loss pressure and overcurrent sensing circuit are connected to the output end of intrinsic safety electric source, judge that short trouble occurs for output end；Institute
It states and loses the output end that voltage detecting circuit is connected in parallel on the intrinsic safety electric source, the overcurrent sensing circuit is connected on the intrinsic safety electricity
On in the output loop in source, the voltage on inspection leakage resistance that is connected in output loop by it determines to export size of current；
The cut-off discharge time adjustment circuit is pressed with the power loss and overcurrent sensing circuit is connect, the fast driving and self- recoverage
Circuit is connect with the cut-off discharge time adjustment circuit, and the fast driving and self-repairing circuit are opened by cut-off protection
The connection of Guan Guanyu power input；It is preset with cut-off discharge time magnitude in the cut-off discharge time adjustment circuit, is exporting
End occurs to send a signal to the fast driving and self- recoverage when failure time of short circuit reaches preset cut-off discharge time magnitude
Circuit；The fast drive circuit drives the cut-off protective switch pipe to cut off circuit rapidly.
2. the adjustable intrinsic safety electric source rear end stop type protection circuit of analogue type guard time according to claim 1, special
Sign is: adjusting the intrinsic safety electricity by adjusting cut-off discharge time magnitude preset in the cut-off discharge time adjustment circuit
The guard time of source rear end stop type protection circuit.
3. the adjustable intrinsic safety electric source rear end stop type protection circuit of analogue type guard time according to claim 1, special
Sign is: the power loss pressure and overcurrent sensing circuit are by two LM311 voltage comparator chip U1And U2, divider resistance Rs1With
Rs2And current sense resistor RsComposition；The LM311 voltage comparator U1And U2Output end be connected directly and realize line and logic function
Energy；Wherein, Vcc1 is the comparator chip U1And U2Supply voltage is provided, through resistance R2、R3、R4It is provided to comparator input terminal
Reference voltage value UurefAnd Uiref, through pull-up resistor R5So that UAExport high level.
4. the adjustable intrinsic safety electric source rear end stop type protection circuit of analogue type guard time according to claim 1, special
Sign is: the cut-off discharge time adjustment circuit uses LTC6994；Its SET pin passes through resistor RSETGround connection, is responsible for setting
Set the inside master oscillator frequency of LTC6994；DIV pin and V+Pins in parallel has capacitor C1With resistance R1, series resistance again later
R2After be grounded.
5. the adjustable intrinsic safety electric source rear end stop type protection circuit of analogue type guard time according to claim 4, special
Sign is: the setting of the cut-off discharge time in the cut-off discharge time adjustment circuit is determined by formula (1):
Wherein, RsetFor the resistance that internal master oscillator frequency is arranged；NDIVInternal clocking frequency divider divider ratio setting value, by resistance
R1And R2Setting determine.
6. the adjustable intrinsic safety electric source rear end stop type protection circuit of analogue type guard time according to claim 1, special
Sign is: the fast driving and self-repairing circuit use NE555 timing chip U4；Wherein Vcc2 is the NE555 timing core
Piece U4Supply voltage is provided, R is passed throughT、CTThe self- recoverage time is set, through pull-up resistor R1Draw high chip output level；S1For P ditch
Road MOSFET protective switch pipe, S2For N-channel MOS FET auxiliary switch, two pipes connect and compose totem, accelerate to protect
Protect switching tube S1Turn-off speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811336888.0A CN109462212B (en) | 2018-11-12 | 2018-11-12 | Analog protection time adjustable intrinsic safety power supply rear end cut-off protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811336888.0A CN109462212B (en) | 2018-11-12 | 2018-11-12 | Analog protection time adjustable intrinsic safety power supply rear end cut-off protection circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN109462212A true CN109462212A (en) | 2019-03-12 |
| CN109462212B CN109462212B (en) | 2021-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811336888.0A Active CN109462212B (en) | 2018-11-12 | 2018-11-12 | Analog protection time adjustable intrinsic safety power supply rear end cut-off protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555636A (en) * | 2020-06-29 | 2020-08-18 | 天津中煤电子信息工程有限公司 | Intrinsic safety voltage relay prolonging device |
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| CN105790207A (en) * | 2016-05-20 | 2016-07-20 | 中国矿业大学 | High-power cut-off type safety barrier |
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| CN101447738A (en) * | 2008-12-29 | 2009-06-03 | 重庆航天工业公司 | Flameproof intrinsically safe power supply device |
| CN101867298A (en) * | 2010-07-03 | 2010-10-20 | 太原理工大学 | Intrinsically-safe power supply device for mining |
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| CN109462212B (en) | 2021-03-26 |
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