CN105262074B - Intrinsic safety current-limiting circuit and electronic equipment - Google Patents
Intrinsic safety current-limiting circuit and electronic equipment Download PDFInfo
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- CN105262074B CN105262074B CN201510755322.1A CN201510755322A CN105262074B CN 105262074 B CN105262074 B CN 105262074B CN 201510755322 A CN201510755322 A CN 201510755322A CN 105262074 B CN105262074 B CN 105262074B
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Abstract
The present invention relates to power supply unit protection technique fields, specifically disclose a kind of intrinsic safety current-limiting circuit and the electronic equipment using the intrinsic safety current-limiting circuit.Intrinsic safety current-limiting circuit of the invention includes reverse connecting protection unit, antistatic surge over voltage protection location, sampling unit, current-limiting protection unit and EMI filter unit, and input terminal connection DC power supply, the output end of reverse connecting protection unit connect the input terminal of sampling unit；One end connection reverse connecting protection unit output end of antistatic surge over voltage protection location, other end ground connection；The input terminal of the output end connection current-limiting protection unit of sampling unit, control terminal connect the control terminal of current-limiting protection unit；The input terminal of the output end connection EMI filter unit of current-limiting protection unit；The output end of EMI filter unit connects load.The present invention can be realized the application safe and reliable in containing explosive gas atmosphere of all DC suppling equipments, and not power down self-recovering function, improve reliability, stability, ease for use and the anti-interference ability of electronic equipment.
Description
[technical field]
The invention belongs to power supply unit protection technique fields, and in particular to a kind of intrinsic safety current-limiting circuit and electronic equipment.
[background technique]
With the raising of productivity, more and more electronic equipments put into petroleum, coal mine, chemical industry etc. containing explosive mixed
It closes in substance environment.The electrical equipment used in explosive mixture environment, explosion-proof is to need one of the problem of paying high attention to.
The prior art by using dedicated anti-explosion terminal box, or by limit electrical equipment circuit various parameters or
Safeguard measure is taken, the spark discharge energy and thermal energy of limiting circuit are come, makes it under normal work and defined malfunction
The electric spark and fuel factor of generation cannot light the explosive mixture of ambient enviroment, to realize electrical explosion proof.
However, these modes have the following problems in actual use:
1, anti-explosion terminal box is usually and is made by casting metal, and effect is work under explosion gas environment, even if box
It is interior have circuit spark occur or box in also permeated some deflagrability gases, spark effect under occur it is small-scale quick-fried
Combustion, box can be subjected to this kind of situation, will not rupture because box is shaky, flame is leaked to environment, causes overall situation
Explosion.But the technology solves the problems, such as explosion with not having essence, and in the range of explosion is only narrowed down to very little,
Limitation is very big in practical application.
2, the scheme for limiting the various parameters of electrical equipment circuit, can effectively prevent the probability to explode.But it limits
The parameter of circuit processed is easy to cause the performance of partial function module to substantially reduce.Such as the nothing in our common handheld devices
Line communication module (3G, WIFI, wireless identification) frequently can lead to the performance of functional module substantially after limiting circuit parameter
Decline.The problems such as some electrical equipment circuits even will appear system failure after using the program.
[summary of the invention]
The present invention is directed to overcome disadvantages described above in the prior art, a kind of intrinsic safety current-limiting circuit is provided and uses the intrinsic safety
The electronic equipment of current-limiting circuit, electronic equipment can be guaranteed containing stable in explosive gas atmosphere, reliable, safety fortune
Row.
In order to solve the above technical problems, the present invention the following technical schemes are provided:
On the one hand, a kind of intrinsic safety current-limiting circuit is provided, including reverse connecting protection unit, antistatic surge over voltage protection location,
Sampling unit, current-limiting protection unit and EMI filter unit, the input terminal connection DC power supply of the reverse connecting protection unit, output
The input terminal of end connection sampling unit；One end connection reverse connecting protection unit output of the antistatic surge over voltage protection location
End, other end ground connection；The input terminal of the output end connection current-limiting protection unit of the sampling unit, the control terminal of sampling unit connect
Connect the control terminal of current-limiting protection unit；The input terminal of the output end connection EMI filter unit of the current-limiting protection unit；It is described
The output end of EMI filter unit connects load.
In some embodiments, the reverse connecting protection unit is Schottky diode, and Schottky diode anode connects direct current
Power supply, cathode connect sampling unit input terminal.
In some embodiments, the antistatic surge over voltage protection location includes varistor, gas-discharge tube, TVS pipe,
The varistor, gas-discharge tube and TVS pipe are parallel with one another, varistor one end connection reverse connecting protection unit output
End, other end ground connection.
In some embodiments, the sampling unit includes transistor Q2, resistance R2, resistance R4, resistance R5, resistance R6 and steady
Diode D3 is pressed, the one end resistance R2 connects the cathode and current limliting of the emitter of transistor Q2, other end connection zener diode D3
The input terminal of protection location, the anode of zener diode D3 connect the one end resistance R6, resistance R6 other end ground connection, resistance R4 and electricity
Hinder in parallel with zener diode D3 after R5 connects, the emitter connection reverse connecting protection unit output end of transistor Q2, collector company
Connect the control terminal of current-limiting protection unit, base stage is connected between resistance R4 and resistance R5.
In some embodiments, the current-limiting protection unit includes metal-oxide-semiconductor Q1, resistance R1 and resistance R3, the metal-oxide-semiconductor Q1's
Source electrode connects the input terminal of the output end of sampling unit, grid connection one end resistance R1, drain electrode connection EMI filter unit, described
The resistance R1 other end ground connection, the one end the resistance R3 connect metal-oxide-semiconductor Q1 source electrode, the other end connection sampling unit control terminal and
The grid of metal-oxide-semiconductor Q1.
In some embodiments, the EMI filter unit includes choke coil L1, capacitor C1 and capacitor C2, the choke coil L1
First input end connection current-limiting protection unit output end, the second input end grounding, choke coil L1 the first output end connection
Load, second output terminal ground connection, the capacitor C1 is connected between the first input end of choke coil L1 and the second input terminal, described
Capacitor C2 is connected between the first output end of choke coil L1 and second output terminal.
On the other hand, the present invention provides a kind of electronic equipment, has used intrinsic safety current limliting as described above in the electrical equipment
Circuit.
Compared with prior art, the beneficial effects of the present invention are: pass through introduce reverse connecting protection, overvoltage protection, EMI filter
The functional modules such as wave, High frequency filter, sampling switch overcurrent protection realize that all DC suppling equipments are containing explosive gas ring
Safe and reliable application and not power down self-recovering function in border, and the performance of electrical equipment is not reduced, it greatly improves containing quick-fried
The flexibility that electronic equipment is used in fried property gaseous environment improves the reliability of electronic equipment, stability, ease for use and anti-dry
Disturb ability.
[Detailed description of the invention]
Fig. 1 is the systematic schematic diagram of the intrinsic safety current-limiting circuit of the embodiment of the present invention.
Fig. 2 is the circuit diagram of the intrinsic safety current-limiting circuit of the embodiment of the present invention.
[specific embodiment]
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
As shown in Figure 1, the present invention includes reverse connecting protection unit, antistatic surge over voltage protection location, sampling unit, current limliting
Protection location and EMI filter unit, input terminal connection DC power supply, the output end of the reverse connecting protection unit connect sampling unit
Input terminal；One end connection reverse connecting protection unit output end of the antistatic surge over voltage protection location, other end ground connection；Institute
The input terminal of the output end connection current-limiting protection unit of sampling unit is stated, the control terminal connection current-limiting protection unit of sampling unit
Control terminal；The input terminal of the current-limiting protection unit output end connection EMI filter unit；The output end of the EMI filter unit
Connection load.It is as shown in Figure 2 to implement circuit.
In Fig. 2, VDC is DC supply input node, and reverse connecting protection unit is Schottky diode D1, Schottky diode
D1 anode connects DC power supply, cathode connects sampling unit input terminal.Schottky diode D1 one-way conduction, resume speed be fast,
Forward voltage drop is small, reverse withstand voltage value is high, meets the needs of reverse connecting protection.It is reversed such as to there is power positive cathode, the partial circuit energy
Enough realize open circuit, the component in effective protection circuit.
Antistatic surge over voltage protection location includes varistor RV, gas-discharge tube GDT, TVS pipe D2, the pressure-sensitive electricity
It is parallel with one another to hinder RV, gas-discharge tube GDT and TVS pipe D2, the one end varistor RV connection reverse connecting protection unit output end,
Other end ground connection.Working principle, the response speed, pressure resistance of varistor RV, gas-discharge tube GDT, TVS pipe D2 these three devices
Range, breakdown voltage range are different, and the present invention uses these three combination of devices, a wide range of to improve the stabilization of circuit
Property.When the voltage value of VDC is more than maximum reverse operating voltage Vwrm, TVS pipe D2 starts to work, and input voltage VDC is greater than
It is clamped in Vwrm；When VDC is greater than Vwrm and is less than Vbr, TVS pipe D2 can be by voltage clamping in Vwrm, and whole system is normal
Work；When the voltage value of VDC is more than TVS pipe breakdown reverse voltage Vbr, TVS pipe D2 enters avalanche breakdown；When VDC is more than Vbr
After the starting voltage for reaching gas-discharge tube GDT, VDC voltage clamping it can be started voltage by gas-discharge tube GDT；When VDC is super
When crossing the breakdown voltage of gas-discharge tube GDT and reaching varistor RV maximum continuous operating voltage Vw, varistor starting；When
When VDC is more than varistor RV maximum clamping voltag VC, varistor RV is by voltage clamping in VC.The present invention can be effectively prevent
The interference such as over-voltage, lightning stroke, surge.
Sampling unit includes transistor Q2, resistance R2, resistance R4, resistance R5, resistance R6 and zener diode D3, resistance R2
One end connects the input terminal of the emitter of transistor Q2, the cathode of other end connection zener diode D3 and current-limiting protection unit,
The anode of zener diode D3 connects the one end resistance R6, resistance R6 other end ground connection, after resistance R4 and resistance R5 series connection with pressure stabilizing
Diode D3 is in parallel, and emitter connection reverse connecting protection unit output end, the collector of transistor Q2 connects current-limiting protection unit
Control terminal, base stage are connected between resistance R4 and resistance R5.
Current-limiting protection unit includes the source electrode connection sampling unit of metal-oxide-semiconductor Q1, resistance R1 and resistance R3, the metal-oxide-semiconductor Q1
Output end, grid connection one end resistance R1, drain electrode connection EMI filter unit input terminal, resistance R1 other end ground connection,
The one end the resistance R3 connects the grid of the source electrode of metal-oxide-semiconductor Q1, the control terminal of other end connection sampling unit and metal-oxide-semiconductor Q1.
Since resistance R3 is far longer than resistance R1, so the grid of metal-oxide-semiconductor Q1 is low level, metal-oxide-semiconductor Q1 under normal condition
Switch is opened.When circuit breaks down, and circuital current is caused to be more than the threshold values of design, the pressure drop at the both ends resistance R2 can be increased, when
When the sum of resistance R2 both ends pressure difference and the both ends resistance R4 pressure difference are more than the Vbe of transistor Q2, the emitter and current collection of transistor Q2
Pole conducting.When the emitter of transistor Q2 is connected with collector, the grid of metal-oxide-semiconductor Q1 is raised, at this time the channel of metal-oxide-semiconductor Q1
It closes, realizes overcurrent protection.When circuit main line, electric current is reduced within Vbe, the collector and emitter of transistor Q2 is closed,
The grid of metal-oxide-semiconductor Q1 is caused to be pulled low again, the channel of metal-oxide-semiconductor Q1 is connected automatically.To realize not power down self-recovering function.
In parallel with zener diode D3 after resistance R4 and resistance R5 series connection, after circuit start, zener diode D3 is reversed
Breakdown, the voltage clamping at both ends is in stable voltage value after resistance R4 is connected with resistance R5.When input voltage variation, pressure stabilizing
The voltage change very little at the both ends diode D3, ensure that the accuracy of use.Therefore the effect of zener diode D3 is extremely important,
The range of tolerable variance of input voltage is expanded, while ensuring the precision of sampling.Different applications can be according to the need of practical application
Ask adjustment metal-oxide-semiconductor Q1, transistor Q2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, zener diode D3
Parameter be configured current limiting threshold.
EMI filter unit includes the first input end connection limit of choke coil L1, capacitor C1 and capacitor C2, the choke coil L1
Output end, the second input end grounding of protection location are flowed, the first output end connection load of choke coil L1, second output terminal connect
Ground, the capacitor C1 are connected between the first input end of choke coil L1 and the second input terminal, and the capacitor C2 is connected to chokes
It encloses between the first output end and second output terminal of L1.Capacitor C1 and capacitor C2 is high pressure ceramic disc capacitor, and choke coil L1 has pole
High initial magnetic permeability has big impedance and insertion loss under earth's magnetic field, if pair interference tool in wider frequency range
There is fabulous inhibiting effect.For eliminating High-frequency Interference, capacity loss is high steady with the variation tool of temperature frequency by capacitor C1, capacitor C2
Qualitative, high current rate of climb is suitable for improving the reliability of product in high voltage and long-term work.
The intrinsic safety current-limiting circuit of the embodiment of the present invention is suitable for various electronic equipments, is particularly suitable for containing fiery gas
Application in body environment.By using the intrinsic safety current-limiting circuit, electronic equipment can be with high reliability and stability safety
Operation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (6)
1. a kind of intrinsic safety current-limiting circuit, it is characterised in that: including reverse connecting protection unit, antistatic surge over voltage protection location, adopt
Sample unit, current-limiting protection unit and EMI filter unit,
Input terminal connection DC power supply, the output end of the reverse connecting protection unit connect the input terminal of sampling unit；
One end connection reverse connecting protection unit output end of the antistatic surge over voltage protection location, other end ground connection；It is described to adopt
The input terminal of the output end connection current-limiting protection unit of sample unit, control terminal connect the control terminal of current-limiting protection unit,
Specifically, the sampling unit includes including transistor Q2, resistance R2, resistance R4, two pole resistance R5, resistance R6 and pressure stabilizing
The one end pipe D3, the resistance R2 connects the emitter of the transistor Q2, and the other end connects the cathode of the zener diode D3,
The anode of the zener diode D3 connects the one end the resistance R6, the resistance R6 other end ground connection, the resistance R4 and institute
State in parallel with the zener diode D3 after resistance R5 series connection, the base stage of the transistor Q2 is connected to the resistance R4 and described
Between resistance R5, the collector of the transistor Q2 connects the control terminal of the current-limiting protection unit,
The input terminal of the current-limiting protection unit is connected between the resistance R2 and the cathode of the zener diode D3, described
The output end of reverse connecting protection unit is connected between the resistance R2 and the emitter of the transistor Q2；
The input terminal of the output end connection EMI filter unit of the current-limiting protection unit；
The EMI filter unit includes the of choke coil L1, capacitor C1 and capacitor C2, the choke coil L1 of the EMI filter unit
Output end, the second input end grounding of one input terminal connection current-limiting protection unit, the first output end connection load of choke coil L1,
Second output terminal ground connection, wherein the capacitor C1 and C2 is high pressure ceramic disc capacitor.
2. intrinsic safety current-limiting circuit according to claim 1, it is characterised in that: the reverse connecting protection unit is two pole of Schottky
Pipe, Schottky diode anode connects DC power supply, cathode connects sampling unit input terminal.
3. intrinsic safety current-limiting circuit according to claim 1, it is characterised in that: the antistatic surge over voltage protection location packet
Varistor, gas-discharge tube, TVS pipe are included, the varistor, gas-discharge tube and TVS pipe are parallel with one another, the pressure-sensitive electricity
Hinder one end connection reverse connecting protection unit output end, other end ground connection.
4. intrinsic safety current-limiting circuit according to claim 1, it is characterised in that: the current-limiting protection unit include metal-oxide-semiconductor Q1,
The source electrode of resistance R1 and resistance R3, the metal-oxide-semiconductor Q1 connect the output end of sampling unit, grid connection one end resistance R1, drain electrode
The input terminal of EMI filter unit is connected, the resistance R1 other end is grounded, the source electrode of the one end resistance R3 connection metal-oxide-semiconductor Q1,
The other end connects the control terminal of sampling unit and the grid of metal-oxide-semiconductor Q1.
5. intrinsic safety current-limiting circuit according to claim 1, it is characterised in that: the capacitor C1 connection of the EMI filter unit
Between the first input end and the second input terminal of choke coil L1, the capacitor C2 be connected to the first output end of choke coil L1 with
Between second output terminal.
6. a kind of electronic equipment, which is characterized in that including intrinsic safety current-limiting circuit according to any one of claims 1 to 5.
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| CN201510755322.1A CN105262074B (en) | 2015-11-09 | 2015-11-09 | Intrinsic safety current-limiting circuit and electronic equipment |
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| CN201510755322.1A CN105262074B (en) | 2015-11-09 | 2015-11-09 | Intrinsic safety current-limiting circuit and electronic equipment |
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| CN105262074B true CN105262074B (en) | 2019-02-26 |
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| CN106505842B (en) * | 2016-10-19 | 2019-09-10 | 飞亚达（集团）股份有限公司 | Airborne DC power supply |
| CN106685031B (en) * | 2017-02-24 | 2023-07-07 | 国网上海市电力公司 | Power input protection rectifying circuit of mobile precious battery management system charges |
| CN107230965A (en) * | 2017-08-07 | 2017-10-03 | 东莞博力威电池有限公司 | Port multi-level protection circuit |
| CN107872053A (en) * | 2017-11-25 | 2018-04-03 | 贵阳永青仪电科技有限公司 | A kind of lightning protection low level switching value sample circuit |
| CN107976569A (en) * | 2017-11-25 | 2018-05-01 | 贵阳永青仪电科技有限公司 | A kind of thunder-lightning die mould simulates signal sample circuit |
| CN108288851A (en) * | 2017-12-11 | 2018-07-17 | 深圳市科卫泰实业发展有限公司 | Circuit is protected in a kind of high-end conducting of voltage conversion input and output |
| CN108288850B (en) * | 2017-12-11 | 2020-06-05 | 深圳市科卫泰实业发展有限公司 | Voltage conversion input/output low-end conduction protection circuit |
| CN108173448A (en) * | 2017-12-26 | 2018-06-15 | 成都鼎信致远科技有限公司 | Exchange full protection high temperature pulse power supply |
| CN110336261B (en) * | 2019-06-28 | 2024-06-21 | 重庆光可巡科技有限公司 | Ibpower safety grid circuit with strong carrying capacity |
| CN110277775A (en) * | 2019-07-29 | 2019-09-24 | 山东国研自动化有限公司 | A kind of intrinsic safety current-limiting circuit constituted based on discrete component |
| CN113629678B (en) * | 2021-07-30 | 2022-05-27 | 珠海格力电器股份有限公司 | Protection device and method of direct current controller and direct current controller |
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