CN201213281Y - Picking/hanging detection circuit for telephone set - Google Patents
Picking/hanging detection circuit for telephone set Download PDFInfo
- Publication number
- CN201213281Y CN201213281Y CNU2008200946757U CN200820094675U CN201213281Y CN 201213281 Y CN201213281 Y CN 201213281Y CN U2008200946757 U CNU2008200946757 U CN U2008200946757U CN 200820094675 U CN200820094675 U CN 200820094675U CN 201213281 Y CN201213281 Y CN 201213281Y
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- phone
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Abstract
The utility model discloses an on/off hook detection circuit of a phone, which comprises a feed circuit, a series current detection circuit, a photocoupling circuit and an amplifier comparison circuit, wherein the series current detection circuit is connected with the supply current of the phone and is used for the sampling of loop current; the photocoupling circuit is connected with the series current detection circuit and is used for isolating the series current detection circuit and the look circuit to be sampled; and the amplifier comparison circuit is connected with the photocoupling circuit and is supplied power by the feed circuit, and the output end of the amplifier comparison circuit is connected with an external on/off hook signal control end for completing the amplifying and the threshold comparison of detecting signals. In order to prevent the phone noise or the malfunction of the circuits, the detection circuit also comprises a hysteresis bistable circuit which is arranged between the amplifier comparison circuit and the photocoupling circuit for the output of the on/off hook logic state. The utility model completes the reliable detection of the on/off hook state through current detection and hysteresis comparison, enables the feed voltage of a short-loop phone interface to be reduced, enhances the capacity of resisting disturbance and reduces the product cost simultaneously.
Description
Technical field
The utility model belongs to the detection range of phone in the telecommunications, is specifically related to a kind of phone and plucks/on-hook detection circuit.
Background technology
At present, common phone generally is applied in fixedly in the switching network, also is applied in the radio reception device.For plucking/the on-hook action of phone, the feed voltage that needs usually to produce 48V is realized, therefore needs the power-supply device of 48V, and cost is higher.Some units, building adopt program-control small convertor, and phone and switch distance are no more than 100m, and radio reception device adopts powered battery, and the feed of 48V just must adopt booster circuit to provide, and has increased cost.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of phone to pluck/on-hook detection circuit.This circuit utilizes low (can hang down 7V), and feed voltage can detect the off-hook of phone, on-hook action reliably.
For solving the problems of the technologies described above, the utility model is achieved through the following technical solutions:
A kind of phone is plucked/on-hook detection circuit, comprises that power supply circuits reach
The series current testing circuit is connected with the feed circuit of phone, is used for the sampling of loop current;
The photoelectricity coupling circuit is connected with the series current testing circuit, is used to the loop current of isolating the series current testing circuit and being sampled;
Amplifying comparison circuit, is connected with the photoelectricity coupling circuit and by described power supply circuits power supply, its output plucks with the external world/and the on-hook signal control end is connected, and is used to finish the amplification and the thresholding comparison of detection signal.
Further, in order to prevent noise or the circuit erroneous action on the telephone line, described phone plucks/on-hook detection circuit also comprises sluggish steady-state circuit, and it is amplifying between comparison circuit and the photoelectricity coupling circuit, is used to pluck/output of on-hook logic state.
Described series current testing circuit comprises first diode, second diode, the 3rd diode, the 4th diode and first resistance and second resistance, wherein first diode is connected with second diode, the 4th diode is connected with the 3rd diode, the positive pole of described first diode is connected with the positive pole of the 4th diode, and the negative pole of second diode is connected with the negative pole of the 3rd diode; Described first resistance is between the negative pole of the negative pole of first diode and the 4th diode, and second resistance, one end is connected with the negative pole of second diode, and the other end is connected with the photoelectricity coupling circuit.
Described photoelectricity coupling circuit comprises light-emitting diode and optical coupling triode, and the positive pole of light-emitting diode is connected with the other end of second resistance, and the light-emitting diode negative pole is connected with the optical coupling triode, is used to control the conducting and the shutoff of optical coupling triode.
Described amplification comparison circuit comprises a comparator and the 3rd resistance, the 4th resistance and the 5th resistance, the anode of comparator is connected respectively with the 4th resistance, the 5th resistance, negative terminal is connected with the collector electrode of optical coupling triode, and output plucks with the external world/and the on-hook signal control end is connected; The other end of described the 4th resistance is connected with power supply circuits and the 3rd resistance respectively, the other end ground connection of described the 5th resistance, and the other end of the 3rd resistance is connected with the collector electrode of optical coupling triode.
Described sluggish steady-state circuit comprises an electrochemical capacitor, and the positive pole of this electrochemical capacitor is connected with the collector electrode of optical coupling triode, and negative pole is connected with the emitter of optical coupling triode and ground connection.
Phone of the present utility model plucks/and on-hook detection circuit has following beneficial effect: and this circuit finished by current detecting and sluggish relatively mode and plucked/reliable Detection of hook state, the feed voltage of becate telephony interface is reduced, strengthen antijamming capability and reduced the conforming requirement of the impedance of dialogue machine own, reduced product cost simultaneously.
Description of drawings
Fig. 1 plucks for phone of the present utility model/circuit theory diagrams of embodiment when on-hook detection circuit is used;
Fig. 2 plucks/on-hook action schematic diagram for phone among Fig. 1.
Embodiment
In order to understand the utility model better, the utility model is done to describe further below in conjunction with the drawings and specific embodiments.
See also Fig. 1, it is plucked for phone of the present utility model/circuit theory diagrams of embodiment when on-hook detection circuit is used, this circuit comprises that phone plucks/on-hook detection circuit, and extraneous phone 100 and radio reception device or Private Branch Exchange PBX equipment 700, wherein phone pluck/on-hook detection circuit comprises series current testing circuit 200, photoelectricity coupling circuit 300, amplifies comparison circuit 500, sluggish steady-state circuit 400 and power supply circuits 600.The circuit working principle of this embodiment is as follows, behind phone 100 off-hooks, and the hook switch K closure of phone 100, feeding circuit is connected, and series current testing circuit 200 has electric current to pass through, resistance R
1On have electric current to flow through because resistance R
1Resistance value first level led D in the photoelectricity coupling circuit 300
5Conduction impedance, therefore most of electric current is from resistance R
1Flow through, and flow through resistance R
1Electric current and flow through light-emitting diode D
5Electric current between fixing proportionate relationship is arranged, so flow through light-emitting diode D
5The electric current linearity sign the electric current of whole loop.Diode D in the series current testing circuit 200
1～D
4Be when polarity is inconsistent when preventing phone 100 incoming lines and radio reception device or Private Branch Exchange PBX equipment 700 output lines, guarantee that electric current is from light-emitting diode D
5Positive pole flow into.Light-emitting diode D
5During work, send certain light and make secondary light coupling triode M in the photoelectricity coupling circuit 300
1Because photoelectric effect and conducting, the degree of its conducting with flow through light-emitting diode D
5Electric current strict relevant, the impedance of conducting has determined itself and resistance R
3Between the dividing potential drop ratio.Along with flowing through R
1Electric current change, this voltage ratio can change thereupon, and this dividing potential drop has determined the level size of "-" input of comparator A, when this level during less than "+" input level of comparator A, comparator A is output as low level, and the plucking of radio reception device or Private Branch Exchange PBX equipment 700 users/on-hook signal control end is changed to low level.
Please consult Fig. 1 again, after phone 100 on-hooks, its hook switch K opens, and feeding circuit disconnects, and series current testing circuit 200 does not have electric current to pass through, light-emitting diode D
5Do not work, just do not send light yet; Optical coupling triode M
1Because light-emitting diode D
5Luminous and can't conducting, "-" input of comparator A be high-impedance state, and comparator A no-output is connected in resistance R
4The power vd D of the power supply circuits 600 of the other end passes through resistance R
6Pressure is high level with drawing on the plucking of radio reception device or Private Branch Exchange PBX equipment 700 users/on-hook signal control end.
As shown in Figure 2, it is plucked/on-hook action schematic diagram for phone among Fig. 1, works as resistance R
1On electric current when reaching 10mA (threshold value 2), radio reception device or Private Branch Exchange PBX equipment 700 judge that phones 100 are off-hook actions, work as R
1On electric current when being reduced to 3mA (threshold value 1), radio reception device or Private Branch Exchange PBX equipment 700 judge that phones 100 are on-hook actions.Wherein, threshold value 1 and threshold value 2 can be by adjusting R
3～R
5Resistors match set.
At optical coupling triode M
1A collector and emitter two ends electrochemical capacitor C in parallel
1, can prevent on phone 100 circuits noise or fast hooking K etc. cause circuit erroneous action, as long as resistance R
1On electric current change the scope do not exceed threshold value 1 and threshold value 2, just can guarantee that the signal of the plucking of radio reception device or Private Branch Exchange PBX equipment 700 users/on-hook signal control end does not change.
By above-mentioned explanation, as can be known the utility model phone pluck/the on-hook detection circuit feed voltage is low, can use powered battery, does not need booster circuit or equipment; In addition, adopt C
1Electrochemical capacitor can prevent hook switch K shake, and circuit operation is reliable; In addition, adopt dividing potential drop and feedback circuit, can adjust dislodging machine threshold value 1 and threshold value 2.The utility model phone is plucked/on-hook detection circuit employing series current detection mode, can reliable detection pluck/on-hook when hanging down to 7V left and right sides feed voltage, and becate length can extend to more than 100 meters.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; should be understood that; for the person of ordinary skill of the art; any modification of being done within every spirit of the present utility model and the principle, be equal to and replace or improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. a phone is plucked/on-hook detection circuit, comprises power supply circuits, it is characterized in that, also comprises
The series current testing circuit is connected with the feed circuit of phone, is used for the sampling of loop current;
The photoelectricity coupling circuit is connected with the series current testing circuit, is used to the loop current of isolating the series current testing circuit and being sampled;
Amplifying comparison circuit, is connected with the photoelectricity coupling circuit and by described power supply circuits power supply, its output plucks with the external world/and the on-hook signal control end is connected, and is used to finish the amplification and the thresholding comparison of detection signal.
2. phone according to claim 1 is plucked/on-hook detection circuit, it is characterized in that, also comprises sluggish steady-state circuit, and it is amplifying between comparison circuit and the photoelectricity coupling circuit, is used to pluck/output of on-hook logic state.
3. phone according to claim 1 and 2 is plucked/on-hook detection circuit, it is characterized in that, described series current testing circuit comprises first diode, second diode, the 3rd diode, the 4th diode and first resistance and second resistance, wherein first diode is connected with second diode, the 4th diode is connected with the 3rd diode, the positive pole of described first diode is connected with the positive pole of the 4th diode, and the negative pole of second diode is connected with the negative pole of the 3rd diode; Described first resistance is between the negative pole of the negative pole of first diode and the 4th diode, and second resistance, one end is connected with the negative pole of second diode, and the other end is connected with the photoelectricity coupling circuit.
4. phone according to claim 3 is plucked/on-hook detection circuit, it is characterized in that, described photoelectricity coupling circuit comprises light-emitting diode and optical coupling triode, the positive pole of light-emitting diode is connected with the other end of second resistance, the light-emitting diode negative pole is connected with the optical coupling triode, is used to control the conducting and the shutoff of optical coupling triode.
5. phone according to claim 4 is plucked/on-hook detection circuit, it is characterized in that, described amplification comparison circuit comprises a comparator and the 3rd resistance, the 4th resistance and the 5th resistance, the anode of comparator is connected respectively with the 4th resistance, the 5th resistance, negative terminal is connected with the collector electrode of optical coupling triode, and output plucks with the external world/and the on-hook signal control end is connected; The other end of described the 4th resistance is connected with power supply circuits and the 3rd resistance respectively, the other end ground connection of described the 5th resistance, and the other end of the 3rd resistance is connected with the collector electrode of optical coupling triode.
6. phone according to claim 5 is plucked/on-hook detection circuit, it is characterized in that, described sluggish steady-state circuit comprises an electrochemical capacitor, and the positive pole of this electrochemical capacitor is connected with the collector electrode of optical coupling triode, and negative pole is connected with the emitter of optical coupling triode and ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200946757U CN201213281Y (en) | 2008-06-13 | 2008-06-13 | Picking/hanging detection circuit for telephone set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200946757U CN201213281Y (en) | 2008-06-13 | 2008-06-13 | Picking/hanging detection circuit for telephone set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201213281Y true CN201213281Y (en) | 2009-03-25 |
Family
ID=40497460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200946757U Expired - Fee Related CN201213281Y (en) | 2008-06-13 | 2008-06-13 | Picking/hanging detection circuit for telephone set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201213281Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938545A (en) * | 2010-08-04 | 2011-01-05 | 中兴通讯股份有限公司 | On/off-hook detection device, method and terminal |
| CN103283256A (en) * | 2011-01-14 | 2013-09-04 | 日本电气英富醍株式会社 | Interface circuit and main device |
| CN103399211A (en) * | 2013-08-14 | 2013-11-20 | 烽火通信科技股份有限公司 | Testing device and testing method for Z interface subscriber loop resistance |
| CN109286716A (en) * | 2018-11-13 | 2019-01-29 | 湖南康通电子股份有限公司 | A kind of on-hook and handle line detection circuit |
-
2008
- 2008-06-13 CN CNU2008200946757U patent/CN201213281Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938545A (en) * | 2010-08-04 | 2011-01-05 | 中兴通讯股份有限公司 | On/off-hook detection device, method and terminal |
| CN101938545B (en) * | 2010-08-04 | 2014-12-10 | 中兴通讯股份有限公司 | On/off-hook detection device, method and terminal |
| CN103283256A (en) * | 2011-01-14 | 2013-09-04 | 日本电气英富醍株式会社 | Interface circuit and main device |
| CN103283256B (en) * | 2011-01-14 | 2016-07-06 | Nec平台株式会社 | Interface circuit and main device |
| CN103399211A (en) * | 2013-08-14 | 2013-11-20 | 烽火通信科技股份有限公司 | Testing device and testing method for Z interface subscriber loop resistance |
| CN103399211B (en) * | 2013-08-14 | 2015-09-16 | 烽火通信科技股份有限公司 | The proving installation of Z interface subscriber loop resistance and method of testing |
| CN109286716A (en) * | 2018-11-13 | 2019-01-29 | 湖南康通电子股份有限公司 | A kind of on-hook and handle line detection circuit |
| CN109286716B (en) * | 2018-11-13 | 2021-04-30 | 湖南康通电子股份有限公司 | On-hook and handle line detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090325 Termination date: 20130613 |