CN2489508Y - Special lightning arrester for computer and telephone line - Google Patents
Special lightning arrester for computer and telephone line Download PDFInfo
- Publication number
- CN2489508Y CN2489508Y CN 01225838 CN01225838U CN2489508Y CN 2489508 Y CN2489508 Y CN 2489508Y CN 01225838 CN01225838 CN 01225838 CN 01225838 U CN01225838 U CN 01225838U CN 2489508 Y CN2489508 Y CN 2489508Y
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- CN
- China
- Prior art keywords
- utility
- model
- lightning arrester
- voltage
- circuit
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- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model relates to a special lightning arrester for computers and telephone lines, which comprises an overpressure short protection circuit connected in parallel with a telephone line and fuse wires or a resistor connected in series with the telephone line. The utility model is characterized in that the overpressure short protection circuit is composed of an all wave bridge rectifier QZ and two-stage amplifiers BG<1>, BG<2> connected with the output end of the all wave bridge rectifier QZ. A voltage measurement element DW connected in series with the resistor R<1> is connected with the base of the BG<1> and the positive output end of the QZ, and positive feedback elements C<f>, R<2> are connected with the position between the collector of the BG<2> and the base of the BG<1>. The utility model has the advantages that the utility model is not additionally provided with a power supply, does not consume power in normal times, and does not affect the normal uses of computers and telephones. When the utility model has smaller current to an 'induction thunder', the circuit can proceed self-recovery and enter the state to be protected after works, and the utility model has good performance, reliable work and low price.
Description
The utility model relates to the special-purpose lightning arrester of words line of a kind of computer, phone.
In the evening of last year, my computer modulator-demodulator and telephone set in parallel have with it been broken in a crash of thunder simultaneously.Through looking into, the voltage that is lightning induction on the words line is too high, has punctured the elements such as IC of electrical equipment, the result has not only caused bigger economic loss, and has influenced the normal use of computer, phone.
The purpose of this utility model provides a kind of superior performance, with low cost, easy to use, and " the special-purpose lightning arrester of the words line of computer, phone " of promotional value arranged.
The technical solution of the utility model is: the special-purpose lightning arrester of the words line of computer, phone; comprise and be attempted by the overvoltage short-circuit protection circuit on the words line and be serially connected in fusing fuse BX, the resistance R of talking about on the line 0; it is characterized in that: the overvoltage short-circuit protection circuit is reached the BG that is connected with its output by full wave bridge rectifier QZ
1, BG
2The transistor dual-stage amplifier is formed, voltage measurement element zener diode DW and resistance R
1After the series connection, be connected on BG
1Base stage and the positive output end of full-wave rectifier QZ, BG
2Collector electrode and BG
1Base stage between be connected to positive feedback element C
f, R
2
The conducting voltage of zener diode DW is 200V.BG
1-2The puncture voltage Uceo of collector electrode and emitter is greater than 220 volts.BG
2Maximum collector current Icm is greater than 2 peaces.Diode D
1-6Withstand voltage be 400 volts, operating current be 1～2 the peace.
Accompanying drawing is the utility model circuit theory diagrams, " IN " line of answering among the figure, " OUT " circuit closer.
Below in conjunction with its design philosophy operation principle of description of drawings.
Through actual measurement, the electric parameter of telephone wire is:
Quiescent direct current voltage U
0=40～50V
Steady state short circuit current I
0=25～50mA (visible internal resistance＞1k Ω)
Jingle bell crest voltage: U
P-p＜190V (about 180V)
During design, consider that two words lines lean on very closely, the induced current of common " induction thunder " is less than 1A, so selected induced current during less than 2A, lightning arrester can fully automatic working, with convenient use.Lightning-arrest starting resistor should be less than security appliance voltage, greater than the jingle bell crest voltage, so selected starting resistor 205V.Because of the internal resistance of words line is big, short circuit current is little, so can adopt " short-circuit method " lightning-arrest.
To extremely rare " direct lightning strike ", its electric current can be powerful unusually, thus adopt fusing fuse BX (or resistance R 0), to meet the standard of zero tolerance.Because the moment shock resistance electric current of BX and R0 is bigger, and thunderbolt is moment, and protector work also is moment, so the power of the conducting electric current of BX and B0 should not select too greatly, can select by 1/5 to 1/15 of fusing value.Because of so the access of the very big R0 of words line internal resistance can not bring any influence to online or conversation.
Circuit parameter as shown in the figure, its operation principle is as follows:
When words line induced voltage was raised to 200V, DW began conducting.When voltage is raised to 205V, BG
1, BG
2Conducting is because C
f, R
2Positive feedback, BG
1, BG
2Enter the saturation conduction state rapidly, make the words line be bordering on short circuit, the thunder of induction can be released rapidly, has guaranteed the safety of words computer that line connects and phone.
Work as BG
2I
CDuring=70-90mA, U
R4Reduce to about 0.6V by 1.4V, make BG
1Withdraw from saturated, through C
f, R
2Positive feedback effect, BG
1, BG
2Transfer to by conducting rapidly and ending.Quiescent current I because of the words line
0＜＜70～90Ma is not so can make BG
1, BG
2Mislead, talk about line after having guaranteed to be struck by lightning and to recover normal immediately.At this moment, if thunder and lightning comes again, or other reason, make the voltage of talking about on the line still up to 205V, circuit can enter the short-circuit protection state again immediately, goes over until danger, goes round and begins again.If electric current is greater than 2A, BX or R0 are fused, and restore after then needing to change BX or R0.
The main performance of the utility model circuit:
During 1 standby, leakage current＜0.5 μ A
During 2 startups, absorption current＞2A
3 starting resistors: 205V
4 start-up times:＜5 μ S
After 5 startups, words line voltage: 3-6V
After 6 startups, release current: 70-90mA
Outstanding advantages of the present utility model is: do not establish in addition power supply, and at ordinary times not power consumption, to computer, phone just The normal use do not have impact. For " induction thunder " electric current hour, can automatically restore behind the circuit working, heavy Newly enter state to be protected. Circuit start is fast, superior performance, cheap, reliable operation.
Claims (3)
1. the special-purpose lightning arrester of the words line of a computer, phone; comprise being attempted by the overvoltage short-circuit protection circuit on the words line and being serially connected in fusing fuse BX, the resistance R of talking about on the line 0 that it is characterized in that: the overvoltage short-circuit protection circuit is reached the BG that is connected with its output by full wave bridge rectifier QZ
1, BG
2The transistor dual-stage amplifier is formed; Voltage measurement element Zener diode DW and resistance R
1Be connected on BG after the series connection
1Base stage and the positive output end of full wave bridge rectifier QZ; BG
2Collector electrode and BG
1Be connected to positive feedback element C between base stage
f, R
2
2. special-purpose lightning arrester according to claim 1 is characterized in that: the conducting voltage of zener diode DW is 200V.
3. according to claim 1,2 described special-purpose lightning arresters, it is characterized in that: BG
1-2The puncture voltage Uceo of collector electrode and emitter is greater than 220 volts, BG
2Maximum collector current Icm is greater than 2 peaces, diode D
1-6Withstand voltage be 400 volts, operating current be 1～2 the peace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01225838 CN2489508Y (en) | 2001-05-29 | 2001-05-29 | Special lightning arrester for computer and telephone line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01225838 CN2489508Y (en) | 2001-05-29 | 2001-05-29 | Special lightning arrester for computer and telephone line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2489508Y true CN2489508Y (en) | 2002-05-01 |
Family
ID=33641709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01225838 Expired - Fee Related CN2489508Y (en) | 2001-05-29 | 2001-05-29 | Special lightning arrester for computer and telephone line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2489508Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440670C (en) * | 2002-08-08 | 2008-12-03 | 中兴通讯股份有限公司 | Monostable comparator device |
-
2001
- 2001-05-29 CN CN 01225838 patent/CN2489508Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440670C (en) * | 2002-08-08 | 2008-12-03 | 中兴通讯股份有限公司 | Monostable comparator device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |