CN108988309A - Based on intrinsic safety electro spark suppression circuit - Google Patents
Based on intrinsic safety electro spark suppression circuit Download PDFInfo
- Publication number
- CN108988309A CN108988309A CN201810946817.6A CN201810946817A CN108988309A CN 108988309 A CN108988309 A CN 108988309A CN 201810946817 A CN201810946817 A CN 201810946817A CN 108988309 A CN108988309 A CN 108988309A
- Authority
- CN
- China
- Prior art keywords
- pin
- circuit
- resistance
- passes
- connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
The present invention relates to essence safety type circuits used in explosive gas atmosphere, are specially based on intrinsic safety electro spark suppression circuit.Based on intrinsic safety electro spark suppression circuit, share two large divisions's composition: a part is constant voltage constant current control circuit；Another part is overvoltage overcurrent protection circuit.Constant voltage constant current control circuit realizes constant pressure and flow control output by GS6200 switching mode constant pressure and flow control chip U1.Overvoltage overcurrent protection circuit is made of following components circuit: standard voltage circuit, comparison circuit, driving circuit, switching circuit electric spark suppression circuit, voltage sample circuit, current sampling amplifying circuit, latching circuit.TL431, LM358, AO4406 integrated circuit have mainly been used in circuit.The application introduces current constant control during pressure stabilizing, increases the protection feature for the intensity raising intrinsic safety circuit that transient current inhibits feed circuit to lower short-circuit spark.
Description
Technical field
The present invention relates to essence safety type circuits used in explosive gas atmosphere, are specially based on intrinsic safety electro
Spark suppression circuit.
Background technique
The electrical equipment used in explosive gas atmosphere generally divides two major classes: flame-proof type, essential safe type.Currently,
Essence safety type circuits structure is made of following components, as shown in Figure 2.From Figure 2 it can be seen that first part is lowering and stabilizing blood pressure list
Member, it is by ac voltage rectifier at defeated through voltage regulator circuit (arithmetic element, sampling unit and protection location) after DC voltage
The voltage of voltage regulation needed out.The output of essence safety type circuits has to comply with the power requirement of essential safe type, and voltage floats not
10% greater than given voltage is obtained, current floating is not greater than to the 10% of constant current, is necessary to switch off after exceeding value given herein above
Output.There are two: 1. lowering and stabilizing blood pressure units in essence safety type circuits, which has only reached pressure stabilizing
Purpose exports constant voltage, and since the output impedance of voltage regulator circuit is very low, output can usually be higher by the number of output-current rating
Times, even if there is overcurrent protection, be formed by when short circuit at circuit load rush of current be also it is very big, this pacifies to realizing
More stringent requirements are proposed for the short circuit requirement of full spark, and the general output power that reduces makes circuit reach essential safe type requirement.2.
High-intensitive short-circuit electric spark is easy to produce when load short circuits, this is because the prolonging due to protection circuit when load circuit short circuit
When, produce electric spark on short dot when not cutting off load circuit, the size of intensity directly affects the safety of circuit
Property.
Summary of the invention
The present invention is based on two o'clocks set forth above, and present applicant proposes a kind of novel protection circuits, during pressure stabilizing
Current constant control is introduced, increases transient current and inhibits feed circuit, lower the intensity of short-circuit spark, improve intrinsic safety circuit
Protection feature.
The present invention adopts the following technical scheme that realization: being based on intrinsic safety electro spark suppression circuit, including type
Number chip U1, the source of stable pressure D6 of model TL431ACLP, model LM358 are controlled for the switching mode constant pressure and flow of GS6200
The metal-oxide-semiconductor Q3 of operational amplifier and model AO4406, the 7th pin of chip U1 and the connection of the 8th pin, the 7th pin and interface
The 1st pin of module P1 connects, and the 7th pin also passes through the 4th capacitor C4 ground connection, the 2nd pin ground connection of interface module P1, chip
The 6th pin of U1, the 3rd pin ground connection, the 1st pin and the connection of the 2nd pin, the 1st pin are grounded by voltage-stabiliser tube D5, also pass through the
One inductance L1, third capacitor C3 ground connection, are also connected by the first inductance L1, first resistor R1 and the 4th pin, and the 4th pin passes through
26th resistance R26 ground connection, the 1st pin of source of stable pressure D6 and the connection of the 3rd pin, the 1st pin also pass through eleventh resistor R11
It is connected with the 1st pin of interface module P1, the 1st pin of source of stable pressure D6 also passes through the electricity of the 24th resistance R24 and the 29th
R29 ground connection, the 2nd pin ground connection of source of stable pressure D6 are hindered, the positive input of the first operational amplifier U2A passes through the 29th resistance
R29 ground connection, reverse input end are connected with the cathode of third crystal diode D3, and the anode of third crystal diode D3 passes through the tenth
Five resistance R15 ground connection, is also connected by the 9th resistance R9, first resistor R1 with the 4th pin of chip U1, and reverse input end is also logical
It crosses first capacitor C1 to connect with output end, reverse input end is also connected with the cathode of first crystal diode D1, first crystal two
The anode of pole pipe D1 is connected by 3rd resistor R3 with the 1st pin of interface module P1, and the anode of first crystal diode D1 is also
It is connected with the collector of the 5th transistor Q5, the base stage of the 5th transistor Q5 passes through the 17th resistance R17 and first
The output end of operational amplifier U2A connects, and emitter ground connection, emitter also passes through the 20th resistance R20 and the second operation amplifier
The reverse input end of device U2B connects, and the reverse input end of second operational amplifier U2B also passes through the 19th resistance R19 and output
End connection, output end are grounded by the 34th resistance R34, the 43rd resistance R43, and output end also passes through the 34th resistance
The connection of the anode of R34 and the 8th crystal diode D8, the cathode of the 8th crystal diode D8 and the first operational amplifier U2A's is anti-
It is connected to input terminal, the positive input of second operational amplifier U2B is grounded by the 7th capacitor C7, also passes through the 31st electricity
Resistance R31 is connected with the 5th pin of chip U1, and the collector of the 5th transistor Q5 is brilliant by thirteenth resistor R13 and first
The base stage of body triode Q1 connects, and the base stage of first crystal triode Q1 also passes through the 1st of the 5th resistance R5 and interface module P1
Pin connection, base stage also pass through the 5th capacitor C5, the 38th resistance R38 ground connection, and the 38th both ends resistance R38 are also parallel with
The emitter of 39th resistance R39 and the 92nd resistance R92, first crystal triode Q1 are grounded, and collector passes through the 6th
The 1st pin of resistance R6 and interface module P1, the 1st pin, the 2nd pin and the 3rd pin of metal-oxide-semiconductor Q3 connect, and the 4th pin passes through
27th resistance R27 ground connection, also connects with the collector of first crystal triode Q1, the 5th pin of metal-oxide-semiconductor Q3, the 6th pipe
Foot, the 7th pin and the connection of the 8th pin, and the 5th pin is connected with the 2nd pin of output module P2, the 1st pipe of output module P2
Foot is connected by first resistor R1 with the 4th pin of chip U1.
Based on intrinsic safety electro spark suppression circuit, share two large divisions's composition: a part is constant pressure and flow control electricity
Road；Another part is overvoltage overcurrent protection circuit.Constant voltage constant current control circuit is controlled by GS6200 switching mode constant pressure and flow
Chip U1 realizes constant pressure and flow control output.The 5th pin CS of chip U1 be current feedback input terminal, U1 the 4th pin FB be
It is constant pressure that Voltage Feedback input terminal, the 7th pin of U1 and the 8th pin VIN, which are power input, the 1st pin of U1 and the 2nd pin SW,
Constant-current supply output end, output output DC12V after inductance L1 and capacitor C3 filtering have the electric energy of constant pressure and flow characteristic.
Overvoltage overcurrent protection circuit is made of following components circuit: standard voltage circuit, comparison circuit, driving
Circuit, switching circuit electric spark suppression circuit, voltage sample circuit, current sampling amplifying circuit, latching circuit.It is main in circuit
TL431, LM358, AO4406 integrated circuit are used.
The source of stable pressure D6 and resistance R11, R24, R29 of TL431ACLP forms standard voltage circuit, provides mark for comparison circuit
Quasi- voltage.
For comparison circuit using the first operational amplifier U2A as comparator, the reverse input end of U2A is to compare input terminal,
The input terminal is synthesized by two parts voltage, voltage sample input, the input of two current samples, when alternative one value is higher than comparator
Comparator is just overturn when positive input normal voltage.
Driving circuit is made of triode Q5, Q1 corresponding resistor connected to it.Comparator output terminal is connected by resistance R17
It is connected to the base stage of Q5, and the collector of Q5 connects through the base stage of resistance R13 and Q1, finally control is transported to by the collector of Q1
The 4 pin control electrodes of metal-oxide-semiconductor Q3 complete driving process.
Switching circuit electric spark suppression circuit is made of the triode Q1 that capacitor C5, the both ends capacitor C5 connect.The circuit is
The functional circuit that the electric spark generated when realizing load short circuits inhibits.
Resistance R9, the R15 connected between constant pressure and flow control chip U1 and GND constitutes voltage sample circuit.Resistance
The tie point of R9 and R15 is voltage sample output.
Tri- resistor coupled in parallel of R38, R39, R92 constitutes current sampling circuit.
Current sampling amplifying circuit uses second operational amplifier U2B amplifier, and U2B is one than rate amplifier, U2B
5 ends be positive input, it is also perseverance while it provides current sampling signal for comparator U2A that 7 ends of U2B, which are output end,
Flow control provides current control information.
Latching circuit uses diode D1, and diode D1 is self-locking diode, the reverse input end of it and U2A and Q5's
Collector connection, is realized from lock control.
The regulated power supply of lowering and stabilizing blood pressure unit output is inputted from interface module P1, sees circuit diagram.Regulated power supply first is that
Constant pressure and flow control chip U1 power supply is given, is also standard voltage circuit, comparison circuit, drive circuitry.Constant pressure and flow control
Regulated power supply is converted into constant pressure and flow output by chip U1, and the U2A of LM358 operational amplifier is comparator, its positive input
End connection normal voltage, reverse input end are to compare input.When reverse input end is greater than positive input normal voltage, compare
The output end of device U2A becomes low level from high level.Q5 collector becomes high level from low level, and Q1 collector is become by high level
For low level, field effect transistor switch pipe Q3 becomes ending from being connected, and has blocked output.Namely Q5 collector becomes high from low level
When level, it is 0 which promotes the 1 of U2A to export by the reverse input end that diode D1 is coupled to U2A.It is reversed as U2A
The output state of comparator is maintained after the revocation of input terminal input signal by the feedback effect of D1 diode.
Tri- resistor coupled in parallel of R38, R39, R92 is as current sampling circuit in circuit, and when electric current reaches protection value, electric current is adopted
Sample voltage inputs second operational amplifier U2B through resistance R31, and the output end of U2B exports high level, then through resistance R34, R43 points
Pressure is output to the reverse input end of the first operational amplifier U2A, and the first operational amplifier U2A overturning, output end output is by high electricity
Flat to become low level, the same voltage protection of principle, field effect transistor switch pipe Q3 becomes off state, has blocked output, and circuit was realized
Stream protection.
Transient state electric spark process of inhibition, when short circuit occurs for load end, short circuit current makes current sample voltage spikes, in electricity
Very precipitous voltage rising edge is generated on stream sampling resistor, precipitous rising edge voltage is coupled to the base of Q1 by C5 capacitor in figure
Pole, due to the conducting of Q5, R5 and R13 are connected to Q1, and base voltage, which just makes Q1 be detached from cut-off region, will go into amplification region, Q1
Base stage make Q1 become being connected from ending at once under the action of C5, the intensity of conducting depends on the size of short circuit current.This
Process is just to have occurred and that before current foldback circuit movement, therefore greatly slackened the intensity of short circuit current, is also just disappeared
The weak intensity of electric spark.
The invention has the following advantages that
1. control precision is high: realizing height due to using the elements such as High-precision standard voltage chips, high precision operating amplifier
Precision controlling.
2. first carrying out constant pressure and flow control to input voltage in circuit, control output power always in safe range.
Constant voltage is exported when open circuit, constant current is exported when short-circuit, this is the effect for introducing constant pressure and flow control unit, is further mentioned
The high characteristic of essential safe type.
3. introducing the inhibition control of the transient current generated by short circuit in circuit, the energy of short circuit current is reduced, is mentioned
High essential safety characteristic, also improves the output power of essential safety.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Fig. 2 is existing essence safety type circuits structural block diagram.
Specific embodiment
Based on intrinsic safety electro spark suppression circuit, the switching mode constant pressure and flow including model GS6200 controls chip
U1, the source of stable pressure U2 of model TL431ACLP, the operational amplifier of model LM358 and model AO4406 metal-oxide-semiconductor Q3,
The 7th pin of chip U1 and the connection of the 8th pin, the 7th pin connects with the 1st pin of interface module P1, and the 7th pin also passes through the
Four capacitor C4 ground connection, the 2nd pin ground connection of interface module P1, the 6th pin of chip U1, the 3rd pin ground connection, the 1st pin and the 2nd
Pin connection, the 1st pin are grounded by voltage-stabiliser tube D5, are also grounded by the first inductance L1, third capacitor C3, and the first electricity is also passed through
Feel L1, first resistor R1 and the connection of the 4th pin, the 4th pin is grounded by the 26th resistance R26, the 1st pin of source of stable pressure D6
It is connected with the 3rd pin, the 1st pin also passes through eleventh resistor R11 and connects with the 1st pin of interface module P1, source of stable pressure D6's
1st pin also passes through the 24th resistance R24 and the 29th resistance R29 ground connection, and the 2nd pin of source of stable pressure D6 is grounded, and first
The positive input of operational amplifier U2A is grounded by the 29th resistance R29, reverse input end and third crystal diode D3
Cathode connection, the anode of third crystal diode D3 is grounded by the 15th resistance R15, also by the 9th resistance R9, first
Resistance R1 is connected with the 4th pin of chip U1, and reverse input end also passes through first capacitor C1 and connects with output end, reverse input end
It is also connected with the cathode of first crystal diode D1, the anode of first crystal diode D1 passes through 3rd resistor R3 and interface module
The 1st pin of P1 connects, and the anode of first crystal diode D1 is also connected with the collector of the 5th transistor Q5, and the 5th is brilliant
The base stage of body triode Q5 is connected by the output end of the 17th resistance R17 and the first operational amplifier U2A, emitter ground connection,
Emitter also passes through the 20th resistance R20 and connects with the reverse input end of second operational amplifier U2B, second operational amplifier
The reverse input end of U2B also passes through the 19th resistance R19 and connects with output end, and output end passes through the 34th resistance R34, the 4th
13 resistance R43 ground connection, output end also pass through the 34th resistance R34 and connect with the anode of the 8th crystal diode D8, and the 8th
The connection of the reverse input end of the cathode of crystal diode D8 and the first operational amplifier U2A, the forward direction of second operational amplifier U2B
Input terminal is grounded by the 7th capacitor C7, is also connected by the 31st resistance R31 with the 5th pin of chip U1, the 5th crystal
The collector of triode Q5 is connected by thirteenth resistor R13 with the base stage of first crystal triode Q1, first crystal triode
The base stage of Q1 also passes through the 5th resistance R5 and connects with the 1st pin of interface module P1, and base stage also passes through the 5th capacitor C5, the 30th
Eight resistance R38 ground connection, the 38th both ends resistance R38 are also parallel with the 39th resistance R39 and the 92nd resistance R92, the
The emitter of one transistor Q1 is grounded, and collector passes through the 1st pin of the 6th resistance R6 and interface module P1, metal-oxide-semiconductor Q3
The 1st pin, the 2nd pin and the 3rd pin connection, the 4th pin by the 27th resistance R27 be grounded, and also and first crystal three
The collector of pole pipe Q1 connects, the 5th pin, the 6th pin, the 7th pin and the connection of the 8th pin of metal-oxide-semiconductor Q3, and the 5th pin and
The 2nd pin of output module P2 connects, and the 1st pin of output module P2 is connected by the 4th pin of first resistor R1 and chip U1
It connects.
Measured data analysis is carried out to electric spark suppression circuit: removing capacitor C5；Input pressure stabilizing 15V voltage；Constant voltage output
12V；Constant current output 500mA；Short circuit load end；Short circuit load end.The voltage wave on current sampling resistor is surveyed with sampling oscilloscope
Shape, measuring crest voltage is 140mV, 0.25 Europe of current sampling resistor equivalence value, short circuit current are as follows: 140mV/0.25=560mA.
The current value is the continuous current of constant pressure and flow unit output.Even if loading terminal shortcircuit but electric current still being controlled in continuous current
On.That is when constant pressure and flow unit works normally, the short circuit current intensity of load end is controlled always in safe range.
Connect C5 capacitor；Input pressure stabilizing 15V voltage；Constant voltage output 12V；Constant current output 500mA；Short circuit load end.With adopting
Sample oscillograph surveys the voltage waveform on current sampling resistor, and measuring crest voltage is 16mV, current sampling resistor equivalence value 0.25
Europe, short circuit current are as follows: 16mV/0.25=64mA.Current ratio are as follows: 560/64=8.75, no C5 electricity can be seen from this numerical value
Hold and there is C5 capacitance current value to differ 8.75 times.
The electric spark that essential safe type generates after short circuit in physical circuit is not enough to the imflammable gas that ignites, so short-circuit
Electric current is the smaller the better.But which limits the power output of intrinsic safety electric source, and the effect of intrinsic safety electro spark suppression circuit,
Maximum power output can be obtained within the scope of essential safety；It can be by short-circuit electricity while existing essential safe type power output
Stream is reduced to the 1/8.75 of former short circuit current, and safety coefficient improves 8.75 times.Here it is where its value.
Claims (1)
1. being based on intrinsic safety electro spark suppression circuit, it is characterised in that the switching mode constant pressure and flow including model GS6200
Control chip U1, the source of stable pressure U2 of model TL431ACLP, the operational amplifier of model LM358 and model AO4406
Metal-oxide-semiconductor Q3, the 7th pin of chip U1 and the connection of the 8th pin, the 7th pin are connected with the 1st pin of interface module P1, the 7th pin
It is also grounded by the 4th capacitor C4, the 2nd pin ground connection of interface module P1, the 6th pin of chip U1, the 3rd pin ground connection, the 1st
Pin and the connection of the 2nd pin, the 1st pin are grounded by voltage-stabiliser tube D5, are also grounded by the first inductance L1, third capacitor C3, also
It is connected by the first inductance L1, first resistor R1 and the 4th pin, the 4th pin is grounded by the 26th resistance R26, source of stable pressure
The 1st pin of D6 and the connection of the 3rd pin, the 1st pin also pass through eleventh resistor R11 and connect with the 1st pin of interface module P1,
The 1st pin of source of stable pressure D6 also passes through the 24th resistance R24 and the 29th resistance R29 ground connection, the 2nd pin of source of stable pressure D6
The positive input of ground connection, the first operational amplifier U2A is grounded by the 29th resistance R29, and reverse input end and third are brilliant
The cathode of body diode D3 connects, and the anode of third crystal diode D3 is grounded by the 15th resistance R15, also passes through the 9th electricity
Resistance R9, first resistor R1 are connected with the 4th pin of chip U1, and reverse input end also passes through first capacitor C1 and connects with output end,
Reverse input end is also connected with the cathode of first crystal diode D1, and the anode of first crystal diode D1 passes through 3rd resistor R3
It is connected with the 1st pin of interface module P1, collector of the anode of first crystal diode D1 also with the 5th transistor Q5
The base stage of connection, the 5th transistor Q5 is connected by the output end of the 17th resistance R17 and the first operational amplifier U2A,
Emitter ground connection, emitter also pass through the 20th resistance R20 and connect with the reverse input end of second operational amplifier U2B, and second
The reverse input end of operational amplifier U2B also passes through the 19th resistance R19 and connects with output end, and output end passes through the 34th electricity
R34, the 43rd resistance R43 ground connection are hindered, output end also passes through the anode of the 34th resistance R34 and the 8th crystal diode D8
The reverse input end connection of connection, the cathode of the 8th crystal diode D8 and the first operational amplifier U2A, second operational amplifier
The positive input of U2B is grounded by the 7th capacitor C7, is also connected by the 31st resistance R31 with the 5th pin of chip U1,
The collector of 5th transistor Q5 is connected by thirteenth resistor R13 with the base stage of first crystal triode Q1, and first is brilliant
The base stage of body triode Q1 also passes through the 5th resistance R5 and connects with the 1st pin of interface module P1, and base stage also passes through the 5th capacitor
C5, the 38th resistance R38 ground connection, the 38th both ends resistance R38 are also parallel with the electricity of the 39th resistance R39 and the 92nd
R92, the emitter ground connection of first crystal triode Q1 are hindered, collector passes through the 1st pin of the 6th resistance R6 and interface module P1,
The 1st pin, the 2nd pin and the connection of the 3rd pin of metal-oxide-semiconductor Q3, the 4th pin are gone back and first by the 27th resistance R27 ground connection
The collector of transistor Q1 connects, the 5th pin, the 6th pin, the 7th pin and the connection of the 8th pin of metal-oxide-semiconductor Q3, and the 5th
Pin is connected with the 2nd pin of output module P2, and the 1st pin of output module P2 passes through the 4th of first resistor R1 and chip U1 the
Pin connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810946817.6A CN108988309B (en) | 2018-08-20 | 2018-08-20 | Intrinsic safety type electric spark suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810946817.6A CN108988309B (en) | 2018-08-20 | 2018-08-20 | Intrinsic safety type electric spark suppression circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108988309A true CN108988309A (en) | 2018-12-11 |
| CN108988309B CN108988309B (en) | 2023-08-29 |
Family
ID=64553616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810946817.6A Active CN108988309B (en) | 2018-08-20 | 2018-08-20 | Intrinsic safety type electric spark suppression circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108988309B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203423615U (en) * | 2013-07-26 | 2014-02-05 | 深圳市英威腾电气股份有限公司 | Intrinsically safe power supply spark inhibition circuit |
| CN104507221A (en) * | 2014-12-17 | 2015-04-08 | 大同裕隆环保有限责任公司 | Combined mining anti-explosion and intrinsic safety type tunnel lamp |
| WO2015113333A1 (en) * | 2014-01-28 | 2015-08-06 | 广东欧珀移动通信有限公司 | Charging control apparatus and method for electronic device |
| CN205657878U (en) * | 2016-04-25 | 2016-10-19 | 中山天外天防爆照明有限公司 | Safe type constant current power supply of essence and essential safe type LED lamp |
| WO2018049955A1 (en) * | 2016-09-14 | 2018-03-22 | 深圳源创智能照明有限公司 | Solar street light control system |
| CN208707303U (en) * | 2018-08-20 | 2019-04-05 | 大同裕隆环保有限责任公司 | Based on intrinsic safety electro spark suppression circuit |
-
2018
- 2018-08-20 CN CN201810946817.6A patent/CN108988309B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203423615U (en) * | 2013-07-26 | 2014-02-05 | 深圳市英威腾电气股份有限公司 | Intrinsically safe power supply spark inhibition circuit |
| WO2015113333A1 (en) * | 2014-01-28 | 2015-08-06 | 广东欧珀移动通信有限公司 | Charging control apparatus and method for electronic device |
| CN104507221A (en) * | 2014-12-17 | 2015-04-08 | 大同裕隆环保有限责任公司 | Combined mining anti-explosion and intrinsic safety type tunnel lamp |
| CN205657878U (en) * | 2016-04-25 | 2016-10-19 | 中山天外天防爆照明有限公司 | Safe type constant current power supply of essence and essential safe type LED lamp |
| WO2018049955A1 (en) * | 2016-09-14 | 2018-03-22 | 深圳源创智能照明有限公司 | Solar street light control system |
| CN208707303U (en) * | 2018-08-20 | 2019-04-05 | 大同裕隆环保有限责任公司 | Based on intrinsic safety electro spark suppression circuit |
Non-Patent Citations (1)
| Title |
|---|
| 蒋慧灵等: "《电气防火》", 兵器工业出版社, pages: 151 - 152 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108988309B (en) | 2023-08-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206225983U (en) | Over-voltage over-current protection circuit | |
| CN102790516B (en) | Feedback clamping power metal oxide semiconductor (MOS) pipe drive circuit for power supply management | |
| CN202696121U (en) | Power factor correction (PFC) overvoltage protection circuit and switch power supply | |
| CN104218558B (en) | Anti-surging high tension protection circuit | |
| CN208707303U (en) | Based on intrinsic safety electro spark suppression circuit | |
| CN102064681B (en) | Switch power supply output overvoltage protection circuit | |
| CN103427621B (en) | A kind of mining isolated intrinsic safety LED drive power | |
| CN101345405B (en) | Protection circuit of power switch device | |
| CN207819757U (en) | A kind of start-up circuit | |
| CN102201661B (en) | Short circuit self-protection circuit and method for insulated gate bipolar device | |
| CN102035381B (en) | BOOST circuit with adjusting starting voltage | |
| CN209659146U (en) | A kind of switch power controller and Switching Power Supply | |
| CN108988309A (en) | Based on intrinsic safety electro spark suppression circuit | |
| CN108899951B (en) | Super capacitor double closed-loop buck-boost charging control circuit based on voltage stabilization output type | |
| CN2728096Y (en) | FET automotive alternator voltage regulator with multiple protective functions | |
| CN207021660U (en) | Electrical source input overvoltage protection and output overvoltage protection circuit | |
| CN207766145U (en) | A kind of MCU power supply circuits and electronic equipment | |
| CN209313724U (en) | A kind of voltage conversion circuit and driving device | |
| CN202524600U (en) | Buck LED constant current drive control circuit | |
| CN205987464U (en) | Intelligence car light control circuit | |
| CN204376695U (en) | With the power starting circuit of fictitious load and the electronic controller of circuit breaker | |
| CN2452246Y (en) | LED ultragrace voltage driver | |
| CN202586752U (en) | Low-voltage protection linear power supply circuit and television set | |
| CN201893974U (en) | Voltage-limiting protection circuit in LED driver | |
| CN208272867U (en) | A kind of adjustable D. C regulated for dual power supply control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 037024 No. 5, Yanxin street community, Yongdingzhuang street, Yungang District, Datong City, Shanxi Province Applicant after: DATONG YULONG ENVIRONMENTAL PROTECTION Co.,Ltd. Address before: 037024 No.5 Yanxin street community, Yongdingzhuang street, mining area, Datong City, Shanxi Province Applicant before: DATONG YULONG ENVIRONMENTAL PROTECTION Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |