CN201315623Y - Pick-up/hang-up detecting circuit and telephone interface equipment - Google Patents
Pick-up/hang-up detecting circuit and telephone interface equipment Download PDFInfo
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- CN201315623Y CN201315623Y CNU2008202349430U CN200820234943U CN201315623Y CN 201315623 Y CN201315623 Y CN 201315623Y CN U2008202349430 U CNU2008202349430 U CN U2008202349430U CN 200820234943 U CN200820234943 U CN 200820234943U CN 201315623 Y CN201315623 Y CN 201315623Y
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Abstract
The utility model provides a pick-up/hang-up detecting circuit and a telephone interface device, which is applied to the technical field of telephone interface equipment. The pick-up/hang-up detecting circuit comprises a division resistor, of which a first terminal is connected with a telephone line and a second terminal is grounded; a pick-up/hang-up detecting unit which is connected with the first terminal of the division resistor and employs different parts to perform the pick-up/hang-up detection on calls at the ringing state and calls at the feeding state separately; and a feeding/ringing switching unit respectively connected with the pick-up/hang-up detecting unit, a feeding/ringing control terminal, a ringing current source, a constant current source and the telephone line. The pick-up/hang-up detecting circuit provided by the utility model employs different parts to perform the pick-up/hang-up detection on calls at the ringing state and calls at the feeding state separately, thereby ensuring the reliability and the application range of the pick-up/hang-up detection; the circuit can simultaneously meet the requirements for the long-distance valid pick-up/hang-up detection and the short-distance large-current ringing power output; and the pick-up/hang-up detection conforms to the telecommunication standards.
Description
Technical field
The utility model belongs to the telephony interface apparatus technology, relates in particular to a kind of picking/hanging machine detection circuit and telephony interface equipment.
Background technology
The telephone exchange interface equipment of expecting someone's call is widely used in the communication field, for people's life has brought a lot of facilities, and the performance of the picking/hanging machine detection circuit of its user interface, can be related to telephone set operate as normal.
Existing picking/hanging machine detection circuit as shown in Figure 1, it mainly comprises divider resistance 300, the feed jingle bell switch unit that constitutes by the first high-pressure electronic K switch 1 and the second high-pressure electronic K switch 2, and the dislodging machine testing unit that constitutes by photoelectrical coupler U5, NAND gate U6, resistance R 11, R12, diode D11, capacitor C 11.The light-emitting diode of telephone wire, inductance, divider resistance 300, photoelectrical coupler U5 constitutes a telephone wire loop with ground, and dislodging machine testing unit is to come the phone machine testing of seting out by the voltage that detects divider resistance 300.
But, this picking/hanging machine detection circuit adopts same testing circuit to the machine testing of seting out of the phone under jingle bell state and feed condition, detected current waveform is different fully under jingle bell state and feed condition, so cause testing circuit can't satisfy simultaneously long apart from the time effective dislodging machine testing and big electric current jingle bell power output closely the time requirement, its detection performance can not meet relevant telecommunications requirement.
The utility model content
The purpose of this utility model is to provide a kind of picking/hanging machine detection circuit, is intended to solve present picking/hanging machine detection circuit and exists it to detect the problem that performance does not meet the telecommunications index request.
The utility model is achieved in that a kind of picking/hanging machine detection circuit, and described testing circuit comprises:
First end is connected with telephone wire, the divider resistance of the second end ground connection;
Be connected with first end of described divider resistance, adopt different parts separately to the set out dislodging machine testing unit of machine testing of the phone under jingle bell state and feed condition; And
Be connected with telephone wire with described dislodging machine testing unit, feed jingle bell control end, jingle bell current source, constant-current source respectively, according to feed jingle bell control signal, control phone works state, and control dislodging machine testing unit adopts different parts to separate the feed jingle bell switch unit that the phone under jingle bell state and feed condition is detected.
Another purpose of the present utility model is to provide a kind of telephony interface equipment, and the picking/hanging machine detection circuit of described telephony interface equipment comprises:
First end is connected with telephone wire, the divider resistance of the second end ground connection;
Be connected with first end of described divider resistance, adopt different parts separately to the set out dislodging machine testing unit of machine testing of the phone under jingle bell state and feed condition; And
Be connected with telephone wire with described dislodging machine testing unit, feed jingle bell control end, jingle bell current source, constant-current source respectively, according to feed jingle bell control signal, control phone works state, and control dislodging machine testing unit adopts different parts to separate the feed jingle bell switch unit that the phone under jingle bell state and feed condition is detected.
In the utility model, picking/hanging machine detection circuit adopts different parts separately to the machine testing of seting out of the phone under jingle bell state and feed condition, the reliability and the scope of application that detect have been guaranteed, can satisfy simultaneously long apart from the time effective dislodging machine testing and big electric current jingle bell power is exported closely the time requirement, its detection meets the telecommunications index request.
Description of drawings
Fig. 1 is the circuit diagram of existing picking/hanging machine detection circuit;
Fig. 2 is the structure chart of the picking/hanging machine detection circuit that provides of the utility model embodiment;
Fig. 3 is the examples of circuits figure of the picking/hanging machine detection circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Telephony interface equipment comprises picking/hanging machine detection circuit, and picking/hanging machine detection circuit is used for phone dislodging machine is detected.
Fig. 2 shows the structure of the picking/hanging machine detection circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model.
The picking/hanging machine detection circuit that the utility model embodiment provides comprises divider resistance 300, and first end of divider resistance 300 is connected with telephone wire, the second end ground connection of divider resistance.
Picking/hanging machine detection circuit also comprises: be connected with first end of divider resistance 300, adopt different parts separately to the set out dislodging machine testing unit 100 of machine testing of the phone under jingle bell state and feed condition, dislodging machine testing unit 100 is to come the phone machine testing of seting out by the voltage that detects divider resistance 300; Be connected with telephone wire with dislodging machine testing unit 100, feed jingle bell control end, jingle bell current source, constant-current source respectively, according to feed jingle bell control signal, control phone works state, and control dislodging machine testing unit 100 adopts different parts to separate the feed jingle bell switch unit 200 that the phone under jingle bell state and feed condition is detected.
Fig. 3 shows the exemplary circuit structure of the picking/hanging machine detection circuit that the utility model embodiment provides.
First end of divider resistance 300 is connected the second end ground connection of divider resistance 300 with the T of telephone wire end.
Dislodging machine testing unit 100 comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first NAND gate U1, the second NAND gate U2, first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3 and diode D1, one end of one end of second resistance R 2 and the 4th resistance R 4 connects first end of divider resistance 300 simultaneously, the other end of second resistance R 2 connects the first input end of the first NAND gate U1 and the negative electrode of diode D1 respectively, the other end of second resistance R 2 also connects power supply by first resistance R 1 respectively, by first capacitor C, 1 ground connection, the other end of the 4th resistance R 4 connects an end of the 3rd resistance R 3 respectively and passes through the 3rd capacitor C 3 ground connection, the other end of the 3rd resistance R 3 connects power supply by the 5th resistance R 5 respectively, by second capacitor C, 2 ground connection, the other end of the 3rd resistance R 3 also connects second input of the first NAND gate U1, and the output of the first NAND gate U1 connects the first input end and second input of the second NAND gate U2 simultaneously.
Feed jingle bell switch unit 200 comprises the first high-pressure electronic K switch 1, the second high-pressure electronic K switch 2, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the 3rd NAND gate U3 and the 4th NAND gate U4, the first input end of the 3rd NAND gate U3 connects the output of the second NAND gate U2, the second input termination feed jingle bell control end of the 3rd NAND gate U3, the output of the 3rd NAND gate U3 connects the negative electrode of light-emitting diode of the first high-pressure electronic K switch 1 and the first input end and second input of the 4th NAND gate U4 respectively, the anode of the light-emitting diode of the first high-pressure electronic K switch 1 connects power supply by the 8th resistance R 8, the first termination jingle bell current source of the photosensitive bidirectional triode thyristor of the first high-pressure electronic K switch 1, the R end of the second termination telephone wire of the photosensitive bidirectional triode thyristor of the first high-pressure electronic K switch 1, the output of the 4th NAND gate U4 connects the negative electrode of the light-emitting diode of the anode of diode D1 and the second high-pressure electronic K switch 2 respectively, the anode of the light-emitting diode of the second high-pressure electronic K switch 2 connects power supply by the 9th resistance R 9, second end of the R end of the first termination telephone wire of the photosensitive bidirectional triode thyristor of the second high-pressure electronic K switch 2 and the photosensitive bidirectional triode thyristor of the first high-pressure electronic K switch 1, second end of the photosensitive bidirectional triode thyristor of the second high-pressure electronic K switch 2 connects constant-current source by the 7th resistance R 7.
The course of work of the picking/hanging machine detection circuit that the utility model embodiment provides is:
When feed jingle bell control end output control signal is impelled 1 conducting of the first high-pressure electronic K switch, phone works is at the jingle bell state, the jingle bell electric current of jingle bell current source output is through the R end of the first high-pressure electronic K switch 1 to telephone wire, export through the T end from its telephone wire behind the phone, arrive ground through divider resistance 300 again, during telephone rings, because the step-down of divider resistance 300, the end that phone and divider resistance 300 links to each other can occur one with the corresponding negative pressure that exchanges of jingle bell electric current, when phone off-hook during at jingle bell, it is big that the jingle bell electric current can become, correspondingly, exchange negative pressure and also become greatly, testing circuit is to judge whether off-hook of phone by the interchange vacuum magnitude on the detection divider resistance 300.
When 1 conducting of the first high-pressure electronic K switch, the negative electrode of the light-emitting diode of the second high-pressure electronic K switch 2 is a high level, coupled diode D1 conducting, the first input end of the first NAND gate U1 is a high level, the invalidating signal of second resistance R 2 input then, the dislodging machine testing is by the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, second capacitor C 2, the 3rd capacitor C 3 and the first NAND gate U1 finish, exchange negative pressure and after the 3rd resistance R 3 and the second capacitor C 2RC filtering, become the direct current negative pressure, and be added to second input of the first NAND gate U1 after relatively through the 4th resistance R 4 and the 5th resistance R 5, when voltage during greater than the input threshold value of the first NAND gate U1, the first NAND gate U1 output low level, testing circuit judges that phone is in hook state, when voltage during less than the input threshold value of the first NAND gate U1, the first NAND gate U1 exports high level, and testing circuit judges that phone is in off hook state.
When feed jingle bell control end output control signal is impelled 2 conductings of the second high-pressure electronic K switch, phone works is at feed condition,-48V constant-current source output continuous current is through the R end of the second high-pressure electronic K switch 2 to telephone wire, export through the T end from its telephone wire behind the phone, arrive ground through divider resistance 300 again, during the phone on-hook, there are not electric current or electric current very little in the loop, the pressure drop of divider resistance 300 is 0 or very little, during the phone off-hook, electric current can become greatly in the loop, and it is big that the pressure drop of divider resistance 300 becomes, and testing circuit is to judge whether off-hook of phone by detecting interchange vacuum magnitude on the divider resistance 300.
When 2 conductings of the second high-pressure electronic K switch, the negative electrode of the light-emitting diode of the second high-pressure electronic K switch 2 is a low level, coupled not conducting of diode D1, because circuit parameter setting, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the detection sensitivity of second capacitor C 2 and the 3rd capacitor C 3 is than first resistance R 1, the detection sensitivity of second resistance R 2 and first capacitor C 1 is little, so the interchange vacuum magnitude that detects on the divider resistance 300 is by first resistance R 1, second resistance R 2, first capacitor C 1 and the first NAND gate U1 finish, negative pressure is added to the first input end of the first NAND gate U1 after relatively through first resistance R 1 and second resistance R 2, when voltage during greater than the input threshold value of the first NAND gate U1, the first NAND gate U1 output low level, testing circuit judges that phone is in hook state, when voltage during less than the input threshold value of the first NAND gate U1, the first NAND gate U1 exports high level, and testing circuit judges that phone is in off hook state.
In the utility model embodiment, because divider resistance 300 parallel connections in dislodging machine testing unit 100 and telephone wire loop, second resistance R 2 of dislodging machine testing unit 100, the 3rd resistance R 3, the 4th resistance R 4 all are high resistant, therefore when meeting with thunderbolt, can not cause dislodging machine testing unit 100 to damage, so the anti-thunderbolt of the picking/hanging machine detection circuit that the utility model embodiment provides performance is strong.
And this circuit is to utilize the input threshold value of NAND gate to realize detecting, the input threshold value of NAND gate is in the time of 100 ℃, its skew is no more than 20%, compares with the testing circuit that photoelectrical coupler constitutes, and the performance of the picking/hanging machine detection circuit that the utility model embodiment provides when high temperature is relatively good.
In the utility model embodiment, picking/hanging machine detection circuit adopts different parts separately to the machine testing of seting out of the phone under jingle bell state and feed condition, the reliability and the scope of application that detect have been guaranteed, it detects performance and meets the telecommunications index request, and because dislodging machine testing unit adopts high resistant resistance to be connected with the telephone wire loop, its anti-thunderbolt performance is strong, because do not adopt photoelectrical coupler, its performance when high temperature is relatively good again.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1, a kind of picking/hanging machine detection circuit is characterized in that, described testing circuit comprises:
First end is connected with telephone wire, the divider resistance of the second end ground connection;
Be connected with first end of described divider resistance, adopt different parts separately to the set out dislodging machine testing unit of machine testing of the phone under jingle bell state and feed condition; And
Be connected with telephone wire with described dislodging machine testing unit, feed jingle bell control end, jingle bell current source, constant-current source respectively, according to feed jingle bell control signal, control phone works state, and control dislodging machine testing unit adopts different parts to separate the feed jingle bell switch unit that the phone under jingle bell state and feed condition is detected.
2, picking/hanging machine detection circuit as claimed in claim 1 is characterized in that, first end of described divider resistance is connected the second end ground connection of described divider resistance with the T of telephone wire end.
3, picking/hanging machine detection circuit as claimed in claim 2, it is characterized in that, described dislodging machine testing unit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, first NAND gate, second NAND gate, first electric capacity, second electric capacity, the 3rd electric capacity and diode, one end of described second resistance and an end of the 4th resistance connect first end of described divider resistance simultaneously, the other end of described second resistance connects the first input end of first NAND gate and the negative electrode of diode respectively, the other end of described second resistance also connects power supply by first resistance respectively, by first capacity earth, the other end of described the 4th resistance connects an end of the 3rd resistance respectively and passes through the 3rd capacity earth, the other end of described the 3rd resistance connects power supply by the 5th resistance respectively, by second capacity earth, the other end of described the 3rd resistance also connects second input of first NAND gate, and the output of described first NAND gate connects the first input end and second input of second NAND gate simultaneously.
4, picking/hanging machine detection circuit as claimed in claim 3, it is characterized in that, described feed jingle bell switch unit comprises the first high-pressure electronic switch, the second high-pressure electronic switch, the 7th resistance, the 8th resistance, the 9th resistance, the 3rd NAND gate and the 4th NAND gate, the first input end of described the 3rd NAND gate connects the output of described second NAND gate, the described feed jingle bell of the second input termination control end of described the 3rd NAND gate, the output of described the 3rd NAND gate connects the negative electrode of light-emitting diode of the described first high-pressure electronic switch and the first input end and second input of the 4th NAND gate respectively, the anode of the light-emitting diode of the described first high-pressure electronic switch connects power supply by the 8th resistance, the described jingle bell current source of first termination of the photosensitive bidirectional triode thyristor of the described first high-pressure electronic switch, the R end of the second termination telephone wire of the photosensitive bidirectional triode thyristor of the described first high-pressure electronic switch, the output of described the 4th NAND gate connects the negative electrode of the light-emitting diode of the anode of described diode and the second high-pressure electronic switch respectively, the anode of the light-emitting diode of the described second high-pressure electronic switch connects power supply by the 9th resistance, second end of the R end of the first termination telephone wire of the photosensitive bidirectional triode thyristor of the described second high-pressure electronic switch and the photosensitive bidirectional triode thyristor of the first high-pressure electronic switch, second end of the photosensitive bidirectional triode thyristor of the described second high-pressure electronic switch connects constant-current source by the 7th resistance.
5, a kind of telephony interface equipment, the picking/hanging machine detection circuit of described telephony interface equipment comprises:
First end is connected with telephone wire, the divider resistance of the second end ground connection;
Be connected with first end of described divider resistance, adopt different parts separately to the set out dislodging machine testing unit of machine testing of the phone under jingle bell state and feed condition; And
Be connected with telephone wire with described dislodging machine testing unit, feed jingle bell control end, jingle bell current source, constant-current source respectively, according to feed jingle bell control signal, control phone works state, and control dislodging machine testing unit adopts different parts to separate the feed jingle bell switch unit that the phone under jingle bell state and feed condition is detected.
6, telephony interface equipment as claimed in claim 5 is characterized in that, first end of described divider resistance is connected the second end ground connection of described divider resistance with the T of telephone wire end.
7, telephony interface equipment as claimed in claim 6, it is characterized in that, described dislodging machine testing unit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, first NAND gate, second NAND gate, first electric capacity, second electric capacity, the 3rd electric capacity and diode, one end of described second resistance and an end of the 4th resistance connect first end of described divider resistance simultaneously, the other end of described second resistance connects the first input end of first NAND gate and the negative electrode of diode respectively, the other end of described second resistance also connects power supply by first resistance respectively, by first capacity earth, the other end of described the 4th resistance connects an end of the 3rd resistance respectively and passes through the 3rd capacity earth, the other end of described the 3rd resistance connects power supply by the 5th resistance respectively, by second capacity earth, the other end of described the 3rd resistance also connects second input of first NAND gate, and the output of described first NAND gate connects the first input end and second input of second NAND gate simultaneously.
8, telephony interface equipment as claimed in claim 7, it is characterized in that, described feed jingle bell switch unit comprises the first high-pressure electronic switch, the second high-pressure electronic switch, the 7th resistance, the 8th resistance, the 9th resistance, the 3rd NAND gate and the 4th NAND gate, the first input end of described the 3rd NAND gate connects the output of described second NAND gate, the described feed jingle bell of the second input termination control end of described the 3rd NAND gate, the output of described the 3rd NAND gate connects the negative electrode of light-emitting diode of the described first high-pressure electronic switch and the first input end and second input of the 4th NAND gate respectively, the anode of the light-emitting diode of the described first high-pressure electronic switch connects power supply by the 8th resistance, the described jingle bell current source of first termination of the photosensitive bidirectional triode thyristor of the described first high-pressure electronic switch, the R end of the second termination telephone wire of the photosensitive bidirectional triode thyristor of the described first high-pressure electronic switch, the output of described the 4th NAND gate connects the negative electrode of the light-emitting diode of the anode of described diode and the second high-pressure electronic switch respectively, the anode of the light-emitting diode of the described second high-pressure electronic switch connects power supply by the 9th resistance, second end of the R end of the first termination telephone wire of the photosensitive bidirectional triode thyristor of the described second high-pressure electronic switch and the photosensitive bidirectional triode thyristor of the first high-pressure electronic switch, second end of the photosensitive bidirectional triode thyristor of the described second high-pressure electronic switch connects constant-current source by the 7th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202349430U CN201315623Y (en) | 2008-12-10 | 2008-12-10 | Pick-up/hang-up detecting circuit and telephone interface equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202349430U CN201315623Y (en) | 2008-12-10 | 2008-12-10 | Pick-up/hang-up detecting circuit and telephone interface equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201315623Y true CN201315623Y (en) | 2009-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202349430U Expired - Fee Related CN201315623Y (en) | 2008-12-10 | 2008-12-10 | Pick-up/hang-up detecting circuit and telephone interface equipment |
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| CN (1) | CN201315623Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183608A (en) * | 2017-12-27 | 2018-06-19 | 浙江大华技术股份有限公司 | A kind of boost pressure circuit |
-
2008
- 2008-12-10 CN CNU2008202349430U patent/CN201315623Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183608A (en) * | 2017-12-27 | 2018-06-19 | 浙江大华技术股份有限公司 | A kind of boost pressure circuit |
| CN108183608B (en) * | 2017-12-27 | 2020-09-29 | 浙江大华技术股份有限公司 | Boosting circuit |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090923 Termination date: 20161210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |