CN207134789U - A kind of lightning protection device of the transmission lines of RS 232 - Google Patents
A kind of lightning protection device of the transmission lines of RS 232 Download PDFInfo
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- CN207134789U CN207134789U CN201721150386.XU CN201721150386U CN207134789U CN 207134789 U CN207134789 U CN 207134789U CN 201721150386 U CN201721150386 U CN 201721150386U CN 207134789 U CN207134789 U CN 207134789U
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- lightning protection
- protection circuit
- voltage
- transmission lines
- tvs4
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Abstract
The utility model discloses a kind of lightning protection device of the transmission lines of RS 232, including first order lightning protection circuit, second level lightning protection circuit and third level lightning protection circuit.The transmission lines of RS 232 are commonly exposed to open air, therefore easily because the reason such as thunderbolt introduces overvoltage.And the transceiver operating voltages of RS 232 are relatively low, typically in 5V or so, it is also very low that itself is pressure-resistant, will punch through damage once overvoltage introduces；When there is strong surge energy to occur, it might even be possible to see that transceiver bursts, the phenomenon that wiring board is charred.The utility model has the advantages that lightning protection device to be arranged on to RS 232 input, the induced voltage of the transmission lines of RS 232 can be down to safe operating voltage, protect the safe operation of the late-class circuits of RS 232.
Description
Technical field
A kind of protection circuit is the utility model is related to, in particular for a kind of lightning protection device of RS-232 transmission lines.
Background technology
In the prior art, in order to reduce infringement of the lightning surge voltage to signal circuit, generally before circuit
End sets lightning protection circuit, and the piezo-resistance of lightning protection circuit generally use one is realized, carries out voltage clamping by piezo-resistance, absorbs more
Remaining electric current is so as to protecting late-class circuit.
RS-232 transmission lines are commonly exposed to open air, therefore easily because the reason such as thunderbolt introduces overvoltage.And RS-232
Transceiver operating voltage is relatively low, and typically in 5V or so, it is also very low that itself is pressure-resistant, will punch through damage once overvoltage introduces；
When there is strong surge energy to occur, it might even be possible to see that transceiver bursts, the phenomenon that wiring board is charred.
Utility model content
The purpose of this utility model is to propose a kind of lightning protection device of RS-232 transmission lines, is disposed at RS-
232 input, the induced voltage of RS-232 transmission lines can be down to safe operating voltage, protect the peace of RS-232 late-class circuits
Row for the national games.
The technical solution of the utility model：
A kind of lightning protection device of RS-232 transmission lines, including first order lightning protection circuit, second level lightning protection circuit and
Three-level lightning protection circuit.
Described first order lightning protection circuit, including gas-discharge tube GDT and TVS1, gas-discharge tube GDT and TVS1 are in parallel,
Wherein TVS1 one end is connected with input positive pole, and the other end is connected with input negative pole.
Described second level lightning protection circuit, including common mode inductance L, TVS2, thermistor PPTC1 and thermistor PPTC2,
Gas-discharge tube GDT both ends are connected across common mode inductance L input both ends, and common mode inductance L output both ends bridge the two of TVS2
End, thermistor PPTC1 and PPTC2 are connected between gas-discharge tube GDT and common mode inductance L two inputs respectively.
Described TVS1, TVS2, TVS3, TVS4 is two-way TVS.
Described third level lightning protection circuit, including TVS3, TVS4 and voltage-regulator diode, TVS3, TVS4 series connection after with TVS2
Parallel connection, TVS3, TVS4 connection end are connected by wired earth, voltage-regulator diode one end with TVS3 anode, voltage-regulator diode
The other end is connected with TVS4 negative terminal, and the both ends of voltage-regulator diode are output voltage.
The beneficial effects of the utility model：
The utility model is simple in construction, have quick response speed to lightening strikes by three-level lightning Protection Design, it is ensured that
Run using the communication device safety of RS-232 buses.
Brief description of the drawings
Fig. 1 is circuit structure diagram of the present utility model.
Embodiment
Specific embodiment of the utility model is described in detail below in conjunction with technical scheme and accompanying drawing.
As shown in figure 1, a kind of lightning protection device of RS-232 transmission lines, including first order lightning protection circuit, the second level are prevented
Thunder and lightning road and third level lightning protection circuit.
Described first order lightning protection circuit, including gas-discharge tube GDT and TVS1, gas-discharge tube GDT and TVS1 are in parallel,
Wherein TVS1 one end is connected with input positive pole, and the other end is connected with input negative pole.
Described second level lightning protection circuit, including common mode inductance L, TVS2, thermistor PPTC1 and thermistor PPTC2,
Gas-discharge tube GDT both ends are connected across common mode inductance L input both ends, and common mode inductance L output both ends bridge the two of TVS2
End, thermistor PPTC1 and PPTC2 are connected between gas-discharge tube GDT and common mode inductance L two inputs respectively.
Described TVS1, TVS2, TVS3, TVS4 is two-way TVS.
Described third level lightning protection circuit, including TVS3, TVS4 and voltage-regulator diode, TVS3, TVS4 series connection after with TVS2
Parallel connection, TVS3, TVS4 connection end are connected by wired earth, voltage-regulator diode one end with TVS3 anode, voltage-regulator diode
The other end is connected with TVS4 negative terminal, and the both ends of voltage-regulator diode are output voltage.
Described first order lightning protection circuit includes gas-discharge tube GDT and TVS1, gas-discharge tube GDT selections
3SPC090FX, voltage stabilizing to 90V, TVS1 select P6KE150CA, minimum conducting voltage is 132V, thus first order lightning protection circuit
Maximum output voltage is 90V.
Described second level lightning protection circuit, including common mode inductance L, TVS2, thermistor PPTC1 and thermistor PPTC2,
Common mode inductance enamel-covered wire selects 0.8mm2, TVS2 select P6KE56A, thermistor PPTC1 and thermistor PPTC2 select
KRG060, second level lightning protection circuit maximum output voltage are 47V.
Described TVS3, TVS4 is two-way TVS, from P6KE36CA.
Described voltage-regulator diode selects 1N4728, then output voltage is up to 3.3V.
Claims (1)
- A kind of a kind of 1. lightning protection device of RS-232 transmission lines, it is characterised in that the lightning protection of described RS-232 transmission lines Protection device, including first order lightning protection circuit, second level lightning protection circuit and third level lightning protection circuit；Described first order lightning protection circuit, including gas-discharge tube GDT and TVS1, gas-discharge tube GDT and TVS1 are in parallel, wherein TVS1 one end is connected with input positive pole, and the other end is connected with input negative pole；Described second level lightning protection circuit, including common mode inductance L, TVS2, thermistor PPTC1 and thermistor PPTC2, gas Discharge tube GDT both ends are connected across common mode inductance L input both ends, common mode inductance L output both ends bridging TVS2 both ends, heat Quick resistance PPTC1 and PPTC2 is connected between gas-discharge tube GDT and common mode inductance L two inputs respectively；Described TVS1, TVS2, TVS3, TVS4 is two-way TVS；Described third level lightning protection circuit, including TVS3, TVS4 and voltage-regulator diode, it is in parallel with TVS2 after TVS3, TVS4 series connection, TVS3, TVS4 connection end are connected by wired earth, voltage-regulator diode one end with TVS3 anode, the voltage-regulator diode other end It is connected with TVS4 negative terminal, the both ends of voltage-regulator diode are output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721150386.XU CN207134789U (en) | 2017-09-08 | 2017-09-08 | A kind of lightning protection device of the transmission lines of RS 232 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721150386.XU CN207134789U (en) | 2017-09-08 | 2017-09-08 | A kind of lightning protection device of the transmission lines of RS 232 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207134789U true CN207134789U (en) | 2018-03-23 |
Family
ID=61638135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721150386.XU Active CN207134789U (en) | 2017-09-08 | 2017-09-08 | A kind of lightning protection device of the transmission lines of RS 232 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207134789U (en) |
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2017
- 2017-09-08 CN CN201721150386.XU patent/CN207134789U/en active Active
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