CN1453985A - Onhook/offhook controller for intelligent telephone - Google Patents
Onhook/offhook controller for intelligent telephone Download PDFInfo
- Publication number
- CN1453985A CN1453985A CN 02117003 CN02117003A CN1453985A CN 1453985 A CN1453985 A CN 1453985A CN 02117003 CN02117003 CN 02117003 CN 02117003 A CN02117003 A CN 02117003A CN 1453985 A CN1453985 A CN 1453985A
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- China
- Prior art keywords
- relay
- bridge rectifier
- pin
- positive
- chip microcomputer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 230000003750 conditioning effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
- Telephonic Communication Services (AREA)
Abstract
The device consists of bridge rectifier, relay and monolithic computer as phone line a and 6 are connected with the bridge rectifier which its negative end is connected to earthing and its positive end to foot 2 of the relay as well as foot, of the relay is connected with the monolithic computer. It is mainly applied in remote control device of the intelligent phone.
Description
Technical field
The present invention relates to a kind of dislodging machine control device of smart phone, belong to the smart phone remote control field.
Background technology
The dislodging machine control technology of existing smart phone normally utilizes the double-tone frequency power transformer to regulate the resistance value that smart phone inserts telephone network, so that make its impedance and loop current meet the requirement of national standard telephone network.And double-tone frequency power transformer volume is bigger, and does not domesticly produce in batches, needs customization or from ordering abroad.Therefore, the dislodging machine control device of existing smart phone exists cost height, volume big, and perhaps poor safety performance may be damaged the equipment of telephone office, the problem that telephone network is had a negative impact.
Summary of the invention
At above-mentioned the problems of the prior art, the invention provides that a kind of cost is low, security performance good, the dislodging machine control device of the smart phone that telephone network is not exerted an influence.
Technical scheme of the present invention, realize as follows:
A kind of dislodging machine control device of smart phone comprises bridge rectifier, relay and single-chip microcomputer.Its design feature is, telephone wire a, b connect bridge rectifier, the bridge rectifier negativing ending grounding, and anode connects 2 pin of relay, and 1 pin of relay is connected with single-chip microcomputer.
Above-mentioned device comprises that also 4 pin of overvoltage crowbar and relay join by a positive-negative-positive triode and the overvoltage crowbar that NPN type triode is formed.
Above-mentioned device also comprises the load trim circuits of being made up of resistance R 19-R22, and load trim circuits and overvoltage crowbar are connected in parallel.
Above-mentioned bridge rectifier is made up of diode D5-D8.Above-mentioned single-chip microcomputer model is AT89C51.
The present invention is owing to used overvoltage crowbar and load trim circuits to come regulating system to insert the resistance value of telephone network; the loop resistance value that has guaranteed this device is not more than 2000 ohm; feed current is not less than 18 milliamperes; avoided the influence of device, reduced the cost of smart phone dislodging machine control device Be Controlled electrical equipment and telephone network.After the present invention adopts bridge rectifier,, also can in subsequent conditioning circuit, obtain the positive level signal, satisfy the level requirement of positive logic chip, guarantee the operate as normal of this device even the user is anti-inserted with telephone wire.
Description of drawings
Accompanying drawing is a circuit connection diagram of the present invention;
Embodiment
Referring to accompanying drawing; the circuit of the dislodging machine control device of smart phone comprises the bridge rectifier of being made up of diode D5-D7 1; relay 2; the overvoltage crowbar of forming by a positive-negative-positive triode and NPN type triode 3 and be AT89C51 single-chip microcomputer 5 by load trim circuits 4 and model that resistance R 19-R22 forms; telephone wire a; b connects bridge rectifier 1; bridge rectifier 1 negativing ending grounding; anode connects 2 pin of relay 2; 4 pin of relay 2 are connected with overvoltage crowbar 3; overvoltage crowbar 3 shunt loads are adjusted circuit 4; 1 pin of relay 2 connects the data/address bus P2.7 of single-chip microcomputer 5,2 of single-chip microcomputer 5 control relays 2; the break-make of 4 pin.This circuit is mainly finished following function: the control of dislodging machine, polarity protection, overvoltage protection, load adjustment.After the present invention adopts bridge rectifier 1,, also can in subsequent conditioning circuit, obtain the positive level signal, satisfy the level requirement of positive logic chip, guarantee operate as normal of the present invention even the user is anti-inserted with telephone wire.For avoiding on the telephone wire because the destruction that the transient high voltage that interference causes causes adopts a positive-negative-positive triode and a NPN type triode to form overvoltage crowbar.Under the normal condition, positive-negative-positive triode and NPN type triode all are operated in the linear amplification district, when high voltage occurring, NPN type triode enters saturation condition, the base current of positive-negative-positive triode no longer has tangible increase with the base current of NPN type triode, thereby limited the electric current of positive-negative-positive transistor collector, avoided the destruction of overvoltage circuit system.
Use when of the present invention, telephone wire transmits the bridge rectifier that input signal is given negativing ending grounding; If 2 pin of single-chip microcomputer 5 control relays 2 are connected, 4 pin interrupt, the smart phone off-hook, and bridge rectifier 1 passes to relay 2 to input signal, if 4 pin of single-chip microcomputer 5 control relays 2 are connected, 2 pin interrupt, then smart phone is hung up.
Claims (5)
1. the dislodging machine control device of a smart phone, comprise bridge rectifier (1), relay (2) and single-chip microcomputer (5), it is characterized in that, telephone wire a, b connect bridge rectifier (1), bridge rectifier (1) negativing ending grounding, anode connects 2 pin of relay (2), and 1 pin of relay (2) is connected with single-chip microcomputer (5).
2. device as claimed in claim 1 is characterized in that, described device comprises also that by a positive-negative-positive triode and the overvoltage crowbar (3) that NPN type triode is formed overvoltage crowbar (3) joins with 4 pin of relay (2).
3. device as claimed in claim 1 or 2 is characterized in that, described device also comprises the load trim circuits of being made up of resistance R 19-R22 (4), and load trim circuits (4) is connected in parallel with overvoltage crowbar (3).
4. device as claimed in claim 3 is characterized in that, described bridge rectifier (1) is made up of diode D5-D8.
5. device as claimed in claim 4 is characterized in that, described single-chip microcomputer (5) model is AT89C51.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021170037A CN1193577C (en) | 2002-04-27 | 2002-04-27 | Onhook/offhook controller for intelligent telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021170037A CN1193577C (en) | 2002-04-27 | 2002-04-27 | Onhook/offhook controller for intelligent telephone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1453985A true CN1453985A (en) | 2003-11-05 |
| CN1193577C CN1193577C (en) | 2005-03-16 |
Family
ID=29257099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021170037A Expired - Fee Related CN1193577C (en) | 2002-04-27 | 2002-04-27 | Onhook/offhook controller for intelligent telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1193577C (en) |
-
2002
- 2002-04-27 CN CNB021170037A patent/CN1193577C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1193577C (en) | 2005-03-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: QINGHUA UNIVERSITY; TONGFANG CO., LTD. Free format text: FORMER NAME OR ADDRESS: QINGHUA UNIVERSITY; TSINGHUA TONGFANG CO., LTD. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050316 Termination date: 20170427 |