CN105591374A - Universal protector based on optoelectronic isolating circuit and lightning protection circuit - Google Patents
Universal protector based on optoelectronic isolating circuit and lightning protection circuit Download PDFInfo
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- CN105591374A CN105591374A CN201410657053.0A CN201410657053A CN105591374A CN 105591374 A CN105591374 A CN 105591374A CN 201410657053 A CN201410657053 A CN 201410657053A CN 105591374 A CN105591374 A CN 105591374A
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- circuit
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- photoelectric isolating
- isolating circuit
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Abstract
The invention discloses a universal protector based on an optoelectronic isolating circuit and a lightning protection circuit and relates to the technical field of communication and lightning protection, and aims at how to combine an optoelectronic isolator and a surge protector and guarantee the cascaded cooperation and noninterference of the optoelectronic isolator and the surge protector. The optoelectronic isolating circuit is connected with the lightning protection circuit via a connection circuit. The ground line loop voltage difference of an electric signal is eliminated by the optoelectronic isolating circuit (10). then the electric signal is output as a unidirectional rectification electric signal by the connection circuit (2), and is finally input into the lightning protection circuit (3), or the electric signal is input into the lightning protection circuit (3) in order that surge pulses are discharged, then is output as a unidirectional rectification electric signal by the connection circuit (2), and is finally input into the optoelectronic isolating circuit (1). The universal protector has dual functions of optoelectronic isolation and lightning protection in a complementary relation, eliminates the disadvantages of the optoelectronic isolation and the lightning protection, protects equipment against interference and damage of the surge pulses, such as overvoltage, overcurrent and the like, conducted by an outside line.
Description
Technical field
The present invention relates to communication and shocking preventing technology field, be specifically related to a kind of omnipotent protector based on photoelectric isolating circuit and lightning protection circuit.
Background technology
When two communication equipments are connected, usually, due to earthed system difference separately, the voltage on ground wire will there are differences. When the voltage difference between ground wire exceedes more than 50V(often can reach 80V) time, RS232 communication will be undesired, when serious, can cause even device damage of interface.
The way of head it off is to use photoisolator traditionally, just not enough but photoisolator itself stands the ability of surge impact, and while running into larger surge, photoisolator is easy to damage. If only prevent surge with Surge Protector, it is the voltage difference between line indelibly again; If use photoisolator to add an independent Surge Protector, the complexity of the system so just increasing, has improved cost. The more important thing is, the cooperation between the two of photoisolator and Surge Protector is a difficult problem, coordinates badly just can not play good protection effect and even affect normal communication, and the equipment of photoisolator and rear end still can not get effective protection.
Summary of the invention
The technical problem to be solved in the present invention is: how photoisolator and Surge Protector are united two into one, ensure that both cascades coordinate, do not interfere with each other.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
Based on an omnipotent protector for photoelectric isolating circuit and lightning protection circuit, comprise input, photoelectric isolating circuit, lightning protection circuit and power-supply circuit, it is characterized in that: photoelectric isolating circuit is connected with lightning protection circuit through connecting circuit (2); The signal of telecommunication is eliminated earth loop voltage differences through photoelectric isolating circuit (1), then exports the one-way commutation signal of telecommunication to lightning protection circuit (3) through connecting circuit (2); Or signal of telecommunication input lightning protection circuit (3) the surge pulse of releasing, then through connecting circuit (2) the output one-way commutation signal of telecommunication to photoelectric isolating circuit (1).
In the present invention, power-supply circuit (4,5) power taking input photoelectric isolating circuit (1) from input and lightning protection circuit respectively
In the present invention, described connecting circuit comprises the first diode, the second diode, the 3rd diode and the 4th diode, the negative electrode of the first diode is connected with the input of photoelectrical coupler in photoelectric isolating circuit (1), the negative electrode of the second diode is connected with the input of the photistor of photoelectrical coupler in photoelectric isolating circuit (1), the anode of the 3rd diode is connected with the negative electrode of the light emitting diode of photoelectrical coupler in photoelectric isolating circuit (1), the anode of the 4th diode is connected with the output of the photistor of photoelectrical coupler in photoelectric isolating circuit (1).
In the present invention, described lightning protection circuit comprises antisurge resistance R 3, antisurge resistance R 4, two-way transient diode TVS1 and two-way transient diode TVS2, gas-discharge tube V1, gas-discharge tube V2, two-way transient diode TVS1 and two-way transient diode TVS2 select more than instantaneous power 600W and breakdown voltage be greater than the two-way transient diode of signal operating voltage, gas-discharge tube V1, gas-discharge tube V2 are the gas-discharge tube that can bear rush of current more than 5KA.
In the present invention, described photoelectric isolating circuit comprises charge pump voltage inversion device, photoelectrical coupler, diode, electric capacity, resistance, and wherein diode is diode more than frequency 60KHZ.
Beneficial effect of the present invention shows:
One, system is simpler, has reduced production cost, on the basis of photoelectricity isolation, adds rational surge protection function, can significantly improve the reliability and stability of RS232 communication system;
Two, adopt stealing technology, directly power taking from signal, product is without external power source;
Three, transfer rate is fast, can reach 300bps-57600bps, the transmission of asynchronous, full duplex all-transparent;
Four, isolation voltage is high, can reach 2500Vrms pulse or 500VDC continuous voltage;
Five, lightning protection function is strong, and maximum can be born 5KA lightning current;
Six, reduce the probability that photoelectricity isolated part damages, eliminate the concept of residual voltage of arrester, whole product is accomplished " zero residual voltage ".
Brief description of the drawings
Fig. 1 is circuit structure diagram of the present invention
In figure, 1 is that photoelectric isolating circuit, 2 is that connecting circuit, 3 lightning protection circuits, 4 and 5 are power-supply circuit;
Fig. 2 is physical circuit figure of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
With reference to Fig. 1, based on the omnipotent protector of photoelectric isolating circuit and lightning protection circuit, comprise input and output terminal, photoelectric isolating circuit, lightning protection circuit and sense circuit, it is characterized in that: the signal of telecommunication has been eliminated earth loop voltage differences through photoelectric isolating circuit (1), be connected with connecting circuit (2), from the signal of telecommunication input lightning protection circuit (3) of connecting circuit output, lightning protection circuit absorbs outside line and conducts the surge pulses such as the indirect lightning strike of coming in; Power-supply circuit (4,5) is power taking input photoelectric isolating circuit (1) from input and lightning protection circuit respectively.
In conjunction with Fig. 2, photoelectric isolating circuit (1) is by optocoupler U1, U2, U3, U4, and resistance R 1, R2 form; Connecting circuit (2) is made up of the diode of D5, D6, D7, tetra-specific directions of D10; Lightning protection circuit (3) is made up of R3, R4, TVS1, TVS2, V1, V2; Power-supply circuit (4) D1 on the left side, D2, D3, D4, C1, C2, C3, U5 composition; Power-supply circuit (5) D8 on the right, D9, D11, D12, C4, C5, C6, U6 composition.
Embodiment mono-
When this circuit two ends are connected to communication apparatus, capacitor C 1, C5 bring negative voltage, C2, the C4 pressure that becomes positively charged. In the time that the left side 3 pin (TXD) send a high level, optocoupler U4 work, 3 pin (TXD) of terminal on the right of the positive voltage on C4 is passed to. In the time that left end 3 human hair combing wastes send a low level, optocoupler U2 work, 3 pin (TXD) of terminal on the right of the negative voltage on C5 is passed to. The principle that is transferred to left end from right-hand member is also the same.
Input/output section form of the present invention is not limit, and can be crimping terminal, also can make DB9 needle connector etc., and circuit performance is not affected.
Embodiment bis-
Connecting circuit part, in order to ensure the smooth transmission of signal, the frequency of this diode need be higher than the frequency of signal transmission, more than being 60KHZ. Meanwhile, need to utilize the anti-phase voltage endurance protection optocoupler of diode, this just requires more than the repercussion breakdown voltage of this this diode need to reach 50V. In this circuit, all diodes of D1---D12 are all that to select is 1N4148, more than frequency can arrive 100KHZ, and repercussion breakdown voltage 75V. Described connecting circuit comprises the first diode, the second diode, the 3rd diode and the 4th diode, the negative electrode of the first diode is connected with the input of photoelectrical coupler in photoelectric isolating circuit, the negative electrode of the second diode is connected with the input of the photistor of photoelectrical coupler in photoelectric isolating circuit, the anode of the 3rd diode is connected with the negative electrode of the light emitting diode of photoelectrical coupler in photoelectric isolating circuit, and the anode of the 4th diode is connected with the output of the photistor of photoelectrical coupler in photoelectric isolating circuit.
Embodiment tri-
Lightning protection circuit part, described lightning protection circuit comprises antisurge resistance R 3, antisurge resistance R 4, two-way transient diode TVS1 and two-way transient diode TVS2, gas-discharge tube V1, gas-discharge tube V2, two-way transient diode TVS1 and two-way transient diode TVS2 select more than instantaneous power 600W and breakdown voltage be greater than the two-way transient diode of signal operating voltage, gas-discharge tube V1, gas-discharge tube V2 are the gas-discharge tube that can bear rush of current more than 5KA. In the time that lightning current is input to this product right-hand member by stube cable, electric current and voltage value will substantially exceed signal itself, if do not add lightning protection circuit, the devices such as the optocoupler of rear class will inevitably damage. When current/voltage value reaches the entry condition of lightning protection circuit, the gas-discharge tube V1 of Surge Protector front end, V2 conducting, release the energy of lightning current on the ground wire of V2 right-hand member. V1, V2 are gas-discharge tube, are prime discharge devices, and requirement can be born rush of current more than 5KA. R3, R4 are antisurge resistance, are the isolating device of front and back level, and guarantee lightning current is released as far as possible on the gas-discharge tube of prime, because it is to be connected on holding wire, are the normal transmission that ensures signal, and resistance value should be as far as possible little. TVS1 and TVS2 are two-way transient diodes, it is rear class discharge device, the energy that prime has not been released is released again, ensure between holding wire or the maximum voltage value of holding wire between is over the ground no more than the maximum voltage value that rear class photoisolator can bear, thereby ensured the safety of rear class device. More than requiring its instantaneous power 600W, breakdown voltage is greater than signal operating voltage, more than 15V.
Embodiment tetra-
Photoelectric isolating circuit and power-supply circuit part, described photoelectric isolating circuit comprises charge pump voltage inversion device, photoelectrical coupler, diode, electric capacity, resistance, wherein diode is diode more than frequency 60KHZ. This circuit is centered by photoelectrical coupler, symmetrical, be now that example: D1, D2, D3, D4, C1, C2, C3, U5 are combined into power-supply circuit taking the left side, use charge pump voltage inversion device U5 that the positive voltage on holding wire is converted to the generating positive and negative voltage output that meets RS232 standard and supply with left side circuit and use. U1----U4 is photoelectrical coupler, and frequency should be able to meet the maximum operation frequency of signal. R1 is current-limiting resistance, ensures the normal work of photoelectrical coupler. When this circuit two ends are connected to communication apparatus, due to the effect of charge pump voltage inversion device U5, U6, capacitor C 1, C5 bring negative voltage, C2, the C4 pressure that becomes positively charged. In the time that the left side 3 pin (TXD) send a high level, optocoupler U4 work, optocoupler right-hand member is connected, and the positive voltage on C4 is passed to 3 pin (TXD) of the right terminal, and now, high level signal has just been transferred to right-hand member by photoisolator from left end; In the time that left end 3 pin (TXD) send a low level, optocoupler U2 work, the conducting of optocoupler right-hand member, 3 pin (TXD) of terminal on the right of the negative voltage on C5 is passed to, now, low level signal has just been transferred to right-hand member by photoisolator from left end. The principle that signal is transferred to left end from right-hand member is also the same.
Claims (2)
1. the omnipotent protector based on photoelectric isolating circuit and lightning protection circuit, comprises input, photoelectric isolating circuit, lightning protection circuit and power-supply circuit, it is characterized in that: photoelectric isolating circuit is connected with lightning protection circuit through connecting circuit (2), the signal of telecommunication is eliminated earth loop voltage differences through photoelectric isolating circuit (1), then exports the one-way commutation signal of telecommunication to lightning protection circuit (3) through connecting circuit (2), or signal of telecommunication input lightning protection circuit (3) the surge pulse of releasing, then through connecting circuit (2) the output one-way commutation signal of telecommunication to photoelectric isolating circuit (1), power-supply circuit (4, 5) from input and lightning protection circuit, photoelectric isolating circuit (1) is inputted in power taking respectively, described connecting circuit comprises the first diode, the second diode, the 3rd diode and the 4th diode, the negative electrode of the first diode is connected with the input of photoelectrical coupler in photoelectric isolating circuit (1), the negative electrode of the second diode is connected with the input of the photistor of photoelectrical coupler in photoelectric isolating circuit (1), the anode of the 3rd diode is connected with the negative electrode of the light emitting diode of photoelectrical coupler in photoelectric isolating circuit (1), the anode of the 4th diode is connected with the output of the photistor of photoelectrical coupler in photoelectric isolating circuit (1), described lightning protection circuit comprises antisurge resistance R 3, antisurge resistance R 4, two-way transient diode TVS1 and two-way transient diode TVS2, gas-discharge tube V1, gas-discharge tube V2, two-way transient diode TVS1 and two-way transient diode TVS2 select more than instantaneous power 600W and breakdown voltage be greater than the two-way transient diode of signal operating voltage, gas-discharge tube V1, gas-discharge tube V2 is the gas-discharge tube that can bear rush of current more than 5KA.
2. the omnipotent protector based on photoelectric isolating circuit and lightning protection circuit according to claim 1; its feature is being: described photoelectric isolating circuit comprises charge pump voltage inversion device, photoelectrical coupler, diode, electric capacity, resistance, and wherein diode is diode more than frequency 60KHZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410657053.0A CN105591374A (en) | 2014-11-18 | 2014-11-18 | Universal protector based on optoelectronic isolating circuit and lightning protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410657053.0A CN105591374A (en) | 2014-11-18 | 2014-11-18 | Universal protector based on optoelectronic isolating circuit and lightning protection circuit |
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| CN105591374A true CN105591374A (en) | 2016-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410657053.0A Pending CN105591374A (en) | 2014-11-18 | 2014-11-18 | Universal protector based on optoelectronic isolating circuit and lightning protection circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099893A (en) * | 2016-08-16 | 2016-11-09 | 凌云光技术集团有限责任公司 | Trigger signal surge protection circuit |
| CN109510185A (en) * | 2018-12-07 | 2019-03-22 | 北京世纪瑞尔技术股份有限公司 | A kind of signal isolating device of anti-electric railway traction reflux interference |
| CN110504666A (en) * | 2019-07-09 | 2019-11-26 | 湖南华润电力鲤鱼江有限公司 | A kind of secondary meter serial communication interface lightning protection interface design |
| CN111641199A (en) * | 2020-05-07 | 2020-09-08 | 中国科学院声学研究所 | Overvoltage protection device and method applied to submarine observation network connection box |
| CN114665438A (en) * | 2022-05-24 | 2022-06-24 | 浙江中控技术股份有限公司 | Terminal board and surge device and safety barrier device comprising same |
| CN111133680B (en) * | 2017-09-29 | 2023-10-31 | 交互数字Ce专利控股公司 | Current isolation device and corresponding system |
-
2014
- 2014-11-18 CN CN201410657053.0A patent/CN105591374A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099893A (en) * | 2016-08-16 | 2016-11-09 | 凌云光技术集团有限责任公司 | Trigger signal surge protection circuit |
| CN111133680B (en) * | 2017-09-29 | 2023-10-31 | 交互数字Ce专利控股公司 | Current isolation device and corresponding system |
| CN109510185A (en) * | 2018-12-07 | 2019-03-22 | 北京世纪瑞尔技术股份有限公司 | A kind of signal isolating device of anti-electric railway traction reflux interference |
| CN110504666A (en) * | 2019-07-09 | 2019-11-26 | 湖南华润电力鲤鱼江有限公司 | A kind of secondary meter serial communication interface lightning protection interface design |
| CN111641199A (en) * | 2020-05-07 | 2020-09-08 | 中国科学院声学研究所 | Overvoltage protection device and method applied to submarine observation network connection box |
| CN114665438A (en) * | 2022-05-24 | 2022-06-24 | 浙江中控技术股份有限公司 | Terminal board and surge device and safety barrier device comprising same |
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Legal Events
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| C06 | Publication | ||
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Application publication date: 20160518 |