CN205791508U - A kind of RS485 port anti-misconnection AC200V and lightning protection circuit - Google Patents
A kind of RS485 port anti-misconnection AC200V and lightning protection circuit Download PDFInfo
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- CN205791508U CN205791508U CN201620480240.0U CN201620480240U CN205791508U CN 205791508 U CN205791508 U CN 205791508U CN 201620480240 U CN201620480240 U CN 201620480240U CN 205791508 U CN205791508 U CN 205791508U
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Abstract
This utility model provides a kind of RS485 port anti-misconnection AC200V and lightning protection circuit; including the gas-discharge tube circuit being connected in parallel between RS485 differential signal interface and diode circuit, between gas-discharge tube circuit and the input of diode circuit and/or between outfan, it is electrically connected with resistance wire；Gas-discharge tube circuit includes that three-end air discharging pipe, the crura intermedium of three-end air discharging pipe connect protecting field or connect product casing ground；Diode circuit includes two-way integrated diode and unilateral diode; the gas-discharge tube circuit being connected in parallel by setting and diode circuit; and three-end air discharging pipe is set in gas-discharge tube circuit; when gas-discharge tube circuit the two poles of the earth are by transient state high energy impact events; the high impedance of two interpolars is become Low ESR; absorb surge or the pulse power of up to thousands of watts; by moment surge over voltage with big current drain to ground, the precision components in protection electronic circuit is from the destruction of various surge pulse effectively.
Description
[technical field]
This utility model relates to circuit protection technical field, particularly relates to a kind of can preferably solve wafer damage that RS485 misconnection causes to AC200V power supply terminal and can guarantee that circuit communication interference-free RS485 port anti-misconnection AC200V and lightning protection circuit.
[background technology]
Along with developing rapidly of modern industrialization process, the application of industrial control equipment, power electronics, electrical equipment over-voltage over-current protection is more and more extensive.RS485 uses differential signal negative logic, and+2V～+6V represents " 0 ", and-6V～-2V represents " 1 ".
RS485 has two-wire system and two kinds of wiring of four-wire system, four-wire system can only realize point-to-point communication mode, seldom using, use the two-wire system mode of connection now more, this mode of connection is that bus type topological structure at most can mount 32 nodes on same bus.Being generally adopted by master-slave communication mode in RS485 communication network, i.e. one host tape is multiple from machine.
In a lot of industrial applications; use situation with by electric line often to have; cause the situation that the misconnections such as power line terminal AC220V cause protection circuit and back-end chip to burn out to RS485 end; in view of this; how to avoid the generation of this problem; promote chip itself from guaranteed cost; it it is the problem that often considers of those skilled in the art; and carried out the substantial amounts of protection Design for 485 interfaces; 485 interfaces are enable to reach good protection effect; meet misconnection 220V voltage and situation about damaging in actual use, improve product reliability.
[utility model content]
For overcoming the problem existing for prior art, this utility model provides a kind of and can preferably solve wafer damage that RS485 misconnection causes to AC200V power supply terminal and can guarantee that circuit communication interference-free RS485 port anti-misconnection AC200V and lightning protection circuit.
This utility model solves the scheme of technical problem and is to provide a kind of RS485 port anti-misconnection AC200V and lightning protection circuit; including the gas-discharge tube circuit being connected in parallel between RS485 differential signal interface and diode circuit, between described gas-discharge tube circuit and the input of diode circuit and/or between outfan, it is electrically connected with resistance wire；
Described gas-discharge tube circuit includes at least one three-end air discharging pipe, and the crura intermedium of this three-end air discharging pipe connects protecting field or connects product casing ground；
Described diode circuit includes at least one two-way integrated diode and the unilateral diode being connected in series with this two-way integrated diode.
Preferably, the quantity of the unilateral diode being connected in series with two-way integrated diode in described diode circuit is two, and described unilateral diode parallel connection Opposite direction connection.
Preferably, described electric fuse is resettable fuse.
Preferably, described three-end air discharging pipe is high pass flow over-voltage protector.
Preferably, the capacitance of described RS485 interface is less than 20pF.
Preferably, the quantity of described two-way integrated diode is one, and its one end is connected with the parallel circuit of unilateral diode, and another terminates RS485 interface circuit.
Preferably, the quantity of described three-end air discharging pipe is one, and the quantity of resistance wire is two, is serially connected with respectively between gas-discharge tube circuit and the input of diode circuit and between gas-discharge tube circuit and the outfan of diode circuit.
Preferably, the surge over voltage rear class protection of described overvoltage crowbar is more than 4kV.
Compared with prior art, gas-discharge tube circuit that this utility model a kind of RS485 port anti-misconnection AC200V and lightning protection circuit are connected in parallel by setting and diode circuit, and three-end air discharging pipe D1 is set in gas-discharge tube circuit, when gas-discharge tube circuit the two poles of the earth are by transient state high energy impact events, the high impedance of two interpolars is become Low ESR, absorb surge or the pulse power of up to thousands of watts, the two poles of the earth short circuit is made to be similar to switch, by moment surge over voltage with big current drain to ground, precision components in protection electronic circuit is from the destruction of various surge pulse effectively, diode circuit protects as secondary, when surge high-voltage impact, D1 releases big electric current, ensure that 485 chips are without damage.
[accompanying drawing explanation]
Fig. 1 is this utility model a kind of RS485 port anti-misconnection AC200V and the electrical block diagram of lightning protection circuit.
[detailed description of the invention]
For making the purpose of this utility model, technical scheme and advantage are clearer, below in conjunction with drawings and Examples, are further elaborated this utility model.Should be appreciated that specific embodiment described herein is used only for explaining this utility model, be not used to limit this utility model.
Refer to Fig. 1; this utility model a kind of RS485 port anti-misconnection AC200V and lightning protection circuit 1 include being connected in parallel in the gas-discharge tube circuit between RS485 differential signal interface and diode circuit, are electrically connected with resistance wire PPTC between described gas-discharge tube circuit and the input of diode circuit and/or between outfan；Described gas-discharge tube circuit includes at least one three-end air discharging pipe D1, and the crura intermedium of this three-end air discharging pipe D1 connects protecting field or connects product casing ground；Described diode circuit includes at least one two-way integrated diode D4 and the unilateral diode being connected in series with this two-way integrated diode D4.
The gas-discharge tube circuit being connected in parallel by setting and diode circuit, and three-end air discharging pipe D1 is set in gas-discharge tube circuit, when gas-discharge tube circuit the two poles of the earth are by transient state high energy impact events, the high impedance of two interpolars is become Low ESR, absorb surge or the pulse power of up to thousands of watts, the two poles of the earth short circuit is made to be similar to switch, by moment surge over voltage with big current drain to ground, precision components in protection electronic circuit is from the destruction of various surge pulse effectively, diode circuit protects as secondary, when surge high-voltage impact, D1 releases big electric current, ensure that 485 chips are without damage.
Preferably, the quantity of the unilateral diode being connected in series with two-way integrated diode D4 in described diode circuit is two, and described unilateral diode parallel connection Opposite direction connection.
Preferably; described electric fuse PPTC is resettable fuse; when circuit misconnection AC220V PTC can along with on circuit the impedance of increasing rapidly of electric current own can change to infinity in the speed internal impedance of MS level, thus the electronic circuit after isolation circuitry protection RS485 interface is without damage.
Preferably, described three-end air discharging pipe D1 is high pass flow over-voltage protector, when its two poles of the earth are by transient state high energy impact events, with the speed of μm magnitude, the high impedance of its two interpolar can be become Low ESR.
Preferably, the capacitance of described RS485 interface is less than 20pF, it is ensured that on bus line, communication is interference-free.
Preferably, the quantity of described two-way integrated diode D4 is one, and its one end is connected with the parallel circuit of unilateral diode, and another terminates RS485 interface circuit.
Preferably, the quantity of described three-end air discharging pipe D1 is one, and the quantity of resistance wire PPTC is two, is serially connected with respectively between gas-discharge tube circuit and the input of diode circuit and between gas-discharge tube circuit and the outfan of diode circuit,
Preferably; the surge over voltage rear class protection of described overvoltage crowbar is more than 4kV; the control circuit of general industry occasion communication RS485 agreement all uses TVS pipe (TRANSIENT VOLTAGE SUPPRESSOR at present; transient voltage suppressor) do surge over voltage protection; and use less than conventional alone TVS pipe electric capacity at this programme, do not interfere with communication quality after multichannel RS485 series connection；Separately when misconnection high pressure forms overcurrent; scheme of the present utility model can protect rear class 485 chip without damage within the ms time; prime overvoltage protection will not action; protection is formed by rear class and PTC; overvoltage protection scheme in this programme, simultaneously, rear class protection can reach 4kV to the prime protective capability up to overvoltage surge 5kA/10kV; guarantee that whole scheme is up to 10kV in the overvoltage protection ability of practical application in industry occasion, far above the outdoor standard-required in industry.
The major function of RS-485 interface circuit is: the differential signal being converted in communication network by " transmitter " by the transmission signal TX from microprocessor, it is also possible to by " receptor ", the differential signal in communication network is converted into the RX signal received by microprocessor.Any instant, RS-485 transceiver is merely able to be operated in one of " reception " or " transmission " both of which, therefore, it is necessary to increase by one for RS-485 interface circuit to transmit/receive logic control circuit.Further, since applied environment is different, the additional protection of RS-485 interface circuit is also the link that necessary emphasis considers.
Compared with prior art, gas-discharge tube circuit that this utility model a kind of RS485 port anti-misconnection AC200V and lightning protection circuit are connected in parallel by setting and diode circuit, and three-end air discharging pipe D1 is set in gas-discharge tube circuit, when gas-discharge tube circuit the two poles of the earth are by transient state high energy impact events, the high impedance of two interpolars is become Low ESR, absorb surge or the pulse power of up to thousands of watts, the two poles of the earth short circuit is made to be similar to switch, by moment surge over voltage with big current drain to ground, precision components in protection electronic circuit is from the destruction of various surge pulse effectively, diode circuit protects as secondary, when surge high-voltage impact, D1 releases big electric current, ensure that 485 chips are without damage.
Above-described this utility model embodiment, is not intended that the restriction to this utility model protection domain.Any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in claims of the present utility model.
Claims (8)
1. a RS485 port anti-misconnection AC200V and lightning protection circuit; it is characterized in that: include being connected in parallel in the gas-discharge tube circuit between RS485 differential signal interface and diode circuit, between described gas-discharge tube circuit and the input of diode circuit and/or between outfan, be electrically connected with resistance wire；
Described gas-discharge tube circuit includes at least one three-end air discharging pipe, and the crura intermedium of this three-end air discharging pipe connects protecting field or connects product casing ground；
Described diode circuit includes at least one two-way integrated diode and the unilateral diode being connected in series with this two-way integrated diode.
2. a kind of RS485 port anti-misconnection AC200V as claimed in claim 1 and lightning protection circuit; it is characterized in that: the quantity of the unilateral diode being connected in series with two-way integrated diode in described diode circuit is two, and described unilateral diode parallel connection Opposite direction connection.
3. a kind of RS485 port anti-misconnection AC200V as claimed in claim 1 and lightning protection circuit, it is characterised in that: described electric fuse is resettable fuse.
4. a kind of RS485 port anti-misconnection AC200V as claimed in claim 1 and lightning protection circuit, it is characterised in that: described three-end air discharging pipe is high pass flow over-voltage protector.
5. a kind of RS485 port anti-misconnection AC200V as claimed in claim 1 and lightning protection circuit, it is characterised in that: the capacitance of described RS485 interface is less than 20pF.
6. a kind of RS485 port anti-misconnection AC200V as claimed in claim 2 and lightning protection circuit, it is characterised in that: the quantity of described two-way integrated diode is one, and its one end is connected with the parallel circuit of unilateral diode, and another terminates RS485 interface circuit.
7. a kind of RS485 port anti-misconnection AC200V as claimed in claim 4 and lightning protection circuit; it is characterized in that: the quantity of described three-end air discharging pipe is one; the quantity of resistance wire is two, is serially connected with respectively between gas-discharge tube circuit and the input of diode circuit and between gas-discharge tube circuit and the outfan of diode circuit.
8. a kind of RS485 port anti-misconnection AC200V as claimed in claim 1 and lightning protection circuit, it is characterised in that: the surge over voltage rear class protection of described overvoltage crowbar is more than 4kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620480240.0U CN205791508U (en) | 2016-05-24 | 2016-05-24 | A kind of RS485 port anti-misconnection AC200V and lightning protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620480240.0U CN205791508U (en) | 2016-05-24 | 2016-05-24 | A kind of RS485 port anti-misconnection AC200V and lightning protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205791508U true CN205791508U (en) | 2016-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620480240.0U Active CN205791508U (en) | 2016-05-24 | 2016-05-24 | A kind of RS485 port anti-misconnection AC200V and lightning protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205791508U (en) |
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2016
- 2016-05-24 CN CN201620480240.0U patent/CN205791508U/en active Active
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518000 T3B5-505A Software Building No. 11 South 7 High-tech Road, Yuehai Street, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen SES Technology Co., Ltd. Address before: 518000 Room 401 5, Fengyun Science and Technology Building, No. 5 Industrial Zone, North District, Nanshan High-tech Zone, Shenzhen City, Guangdong Province (office only) Patentee before: Shenzhen City Sheng technology Limited by Share Ltd |