CN1215525A - Method and arrangement for increasing onhook voltage - Google Patents
Method and arrangement for increasing onhook voltage Download PDFInfo
- Publication number
- CN1215525A CN1215525A CN 97193563 CN97193563A CN1215525A CN 1215525 A CN1215525 A CN 1215525A CN 97193563 CN97193563 CN 97193563 CN 97193563 A CN97193563 A CN 97193563A CN 1215525 A CN1215525 A CN 1215525A
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- voltage
- scheme
- voltage source
- hook
- current
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/001—Current supply source at the exchanger providing current to substations
- H04M19/008—Using DC/DC converters
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
A method and an arrangement for increasing onhook voltage, the arrangement being used in a subscriber interface unit, the subscriber loop (B) comprising lines (a, b), and at least one terminal (3), and the subscriber interface unit comprising adapter means (1) for adapting the lines (a, b) for the subscriber interface unit, the arrangement comprising a battery voltage source (4) for generating a battery voltage (Vbat). The arrangement comprises an additional voltage source (2) connected to the battery voltage source (4) for adding an additional voltage (Vad) to the battery voltage in an onhook situation.
Description
The present invention relates to a method that increases the on-hook voltage in the local loop, said method is used in the user interface section, above-mentioned local loop comprises circuit, at least one terminal, above-mentioned user interface section comprises at user interface section above-mentioned circuit is carried out the cell voltage that adaptive adaptive device and are produced by battery voltage source.
Solution of the present invention can be used in the telecommunication apparatus, especially is used in the subscriber signaling equipment, and these equipment need increase the on-hook voltage in the local loop in some cases.On-hook voltage is meant when a terminal, the voltage that occurs between the subscriber's line when for example the transmitter of a phone is hung up.Off-hook voltage is meant that for example the transmitter of a phone is plucked the voltage that time-out occurs between subscriber's line when a terminal.When off-hook voltage occurred, off hook state appearred in the system.Usually for example-48 operating voltage or the cell voltage of V link to each other subscriber signaling equipment with one.But employed cell voltage can not provide sufficiently high on-hook voltage to local loop all the time.In addition, the local loop voltage ratio of some telephone exchange needs is by the voltage height of common batteries voltage generation.Target of the present invention is to increase on-hook voltage.
The basis of the solution of known increase on-hook voltage is to use two other cell voltages of branch.For this reason, the prior art solutions complexity, costliness, and take big quantity space.The parts that use in the scheme also have higher power consumption.
Target of the present invention provides novel, increases the solution of the on-hook voltage under the hook state, and this scheme has been avoided problems of the prior art.
Can realize this target by the method for describing at introductory section, the method is characterized in that the auxiliary voltage that produces by above-mentioned battery voltage source increases the on-hook voltage that adaptive device provides to terminal.
Another target of the present invention is a scheme that increases the on-hook voltage in the local loop, in a user interface section, use such scheme, above-mentioned local loop comprises circuit, with at least one terminal, above-mentioned user interface section comprises at user's order unit above-mentioned circuit is carried out adaptive adaptive device that such scheme comprises a battery voltage source that produces cell voltage.
The solution of the present invention is characterised in that this scheme comprises that one links to each other with battery voltage source, increases the additional voltage source of an auxiliary voltage to cell voltage under hook state.
Method of the present invention and scheme have many advantages.The present invention allows to have only a cell voltage to increase the on-hook voltage of a local loop.In addition, solution of the present invention allows to provide the fixed voltage with correct amplitude in a local loop under hook state.Solution of the present invention is simple and power consumption is very low.Because the parts that use are less, so expense is not high yet.In addition, solution of the present invention than the scheme occupation space of prior art still less.
Below, with reference to example shown in the drawings the present invention is described in more detail.
Fig. 1 has illustrated the optimum legend that is communicated with of of the solution of the present invention,
Fig. 2 has illustrated another optimum legend that is communicated with of the solution of the present invention.
Fig. 1 has illustrated a scheme that increases the on-hook voltage Von under the hook state of the present invention.This scheme comprises 1, one battery voltage source 4 of adaptive device and a local loop B.Local loop B comprises circuit a and b, with a terminal 3 that links to each other with b with circuit a.In graphic example, terminal is a phone.Adaptive device 1 carries out adaptive at user interface section to circuit a and b.Preferably in a subscriber line interface circuit SLIC, realize adaptive device 1.For example SLIC can be commercialization circuit Am79M574.This scheme also comprises an additional voltage source 2.In the example of Fig. 1, realize additional voltage source 2 by a commercialization DC/DC transducer or a Switching Power Supply.Additional voltage source 2 comprises a primary side 2a and a secondary end 2b.The primary side 2a of additional voltage source links to each other with battery voltage source 4, and its secondary end 2b links to each other with adaptive device 1.
In the scheme of Fig. 1, in battery voltage source 4, occur being generally-44V is to the cell voltage Vbat of-54V.The amplitude of cell voltage Vbat is influential to the amplitude of the on-hook voltage Von among the local loop B.The additional voltage source 2 that links to each other with battery voltage source 4 produces auxiliary voltage Vad according to cell voltage Vbat.The auxiliary voltage Vad that produces is added on the cell voltage Vbat of battery voltage source 4 generations, wherein increases the on-hook voltage Von that is provided to local loop B by adaptive device 1 in proportion.In the scheme of Fig. 1, the user terminal 3 that is actually a phone is connected between circuit a and the b.
In the solution of Fig. 1, the cell voltage Vbat that is provided to the primary side 2a of additional voltage source 2 from battery voltage source 4 bears.But cell voltage Vbat also can be positive; In this case, must adjust coupling so that the polarity of corresponding cell voltage Vbat.The negative cell voltage Vbat that additional voltage source 2 conversion battery voltage sources 4 provide; As the result of conversion, reference voltage (criterionvoltage) Vkr of appearance-60V on the secondary end 2b of additional voltage source 2 and the A point between the adaptive device.
Fig. 2 has illustrated a scheme, and this scheme comprises 1, one reference voltage source 4 of adaptive device and a local loop B.Local loop B comprises circuit a and b, with a terminal 3 that links to each other with b with circuit a.In addition, this scheme comprises current-limiting apparatus 5 and diode 6,7.Current-limiting apparatus 5 is connected to adaptive device 1 by diode 6: the negative pole of diode 6 links to each other with adaptive device, and the positive pole of diode 6 links to each other with current-limiting apparatus 5.In fact, realize current-limiting apparatus 5 by a fixed current generator.The positive pole of diode 6,7 is connected with each other.The negative pole of diode 7 links to each other with additional voltage source 2 with battery voltage source 4.Select diode 6,7 by this way, promptly they guarantee electric current about 50mA, and voltage is more than 60V.The user terminal 3 that is a phone in this case is connected between adaptive device 1 extended circuit a and the b.
By Fig. 2 can find cell voltage Vbat that battery voltage source 4 produces usually at-44V in the scope of-54V.Additional voltage source 2 and current-limiting apparatus 5 shown in Figure 2 are increased in the voltage that offers adaptive device 1 under the hook state.Simultaneously, also increased the on-hook voltage Von that under hook state, appears among the local loop B.Like this, in the solution of the present invention, on-hook voltage Von is higher than the on-hook voltage that only produces by battery voltage source 4.Only under hook state, connect the auxiliary voltage Vad that additional voltage source 2 produces.Even current-limiting apparatus 5 comprises a cell voltage Vbat who produces at battery voltage source 4 and can produce under the situation of vibration, also can keep reference voltage V kr to be fixing voltage correction circuit 8 on the A point between diode 6,7 and the adaptive device 1.The maximum supply power voltage that can guarantee adaptive device 5 by correcting circuit 8 can not surpass the voltage that A is ordered.If the disturbance voltage such as fluctuation voltage occurs in the cell voltage that battery voltage source 4 produces, correcting circuit 8 can make the voltage Vkr on the A point be maintained fixed.
In scheme shown in Figure 2, provide electric current I by adaptive device 1.Design current-limiting apparatus 5 makes it to have the magnitude of current under the hook state, promptly identical with adaptive device 1 magnitude of current.In this case, the voltage that occurs on the positive pole of diode 6,7 on the A point is the summation of the cell voltage Vbat and the auxiliary voltage Vad that additional voltage source 2 produces of battery voltage source 4 generations.Under off hook state, the most electric currents that provide by adaptive device 4 have passed through diode 7, and wherein the auxiliary voltage Vad of additional voltage source 2 generations is not added on the cell voltage Vbat of battery voltage source 4 generations.In this case, on the A point cell voltage Vbat only appears.
If the main value of cell voltage Vbat is-48V in the scheme of Fig. 2, then the voltage of ordering by the A of correcting circuit 8 corrections is-60V.If the expectation magnitude of on-hook voltage Von is-44V under the hook state, and the cell voltage Vbat that uses is-44V that then required voltage is-60V on the A point.In this case, additional voltage source 2 produces one and is approximately-the auxiliary voltage Vad of 18V.If auxiliary voltage Vad and the simple addition of cell voltage Vbat, then summation is-62V.But the voltage of nearly 2V has been consumed in the various pressure drops.Like this, the voltage that occurs on the A point in Fig. 2 is-60V, thus the on-hook voltage of permission generation-44V under hook state.
Although described the present invention with reference to the example of accompanying drawing above, obviously the present invention is not limited in this example, can make amendment to it by many modes in the scope of appended claims invention disclosed notion.
Claims (14)
1. improve the method for on-hook voltage (Von) among the local loop B, in a user interface section, use said method, above-mentioned local loop (B) comprises circuit (a, b) and at least one terminal (3), and above-mentioned user interface section comprises at user interface section circuit (a, b) carry out adaptive adaptive device (1), a battery voltage source (4) produces a cell voltage (Vbat), it is characterized in that the on-hook voltage (Von) that provides to terminal (3) from adaptive device (1) is provided the auxiliary voltage (Vad) that produces by above-mentioned additional voltage source (4).
2. the method for claim 1 is characterized in that only connecting auxiliary voltage (Vad) under hook state.
3. the method for claim 1 is characterized in that limiting the electric current that auxiliary voltage (Vad) produces.
4. method as claimed in claim 3 is characterized in that electric current is restricted to the magnitude of current that adaptive device (1) is had by approximate under hook state.
5. the method for claim 1 is characterized in that making the reference voltage (Vkr) that occurs on the A point between battery voltage source (4) and the adaptive device (1) to be maintained fixed.
6. improve the scheme of on-hook voltage (Von) among the local loop B, in a user interface section, use such scheme, above-mentioned local loop (B) comprises circuit (a, b) and at least one terminal (3), and above-mentioned user interface section comprises at user interface section circuit (a, b) carry out adaptive adaptive device (1), such scheme comprises a battery voltage source (4) that produces cell voltage (Vbat), it is characterized in that this scheme comprises an additional voltage source (2) that links to each other with battery voltage source and increase auxiliary voltage (Vad) to cell voltage under hook state.
7. scheme as claimed in claim 6 is characterized in that additional voltage source (2) is connected with battery voltage source (4).
8. scheme as claimed in claim 7 is characterized in that additional voltage source (2) is a DC/DC transducer or a Switching Power Supply.
9. scheme as claimed in claim 6 is characterized in that this scheme is included in the current-limiting apparatus (5) of connecting auxiliary voltage (Vad) under the hook state.
10. scheme as claimed in claim 9 is characterized in that current-limiting apparatus (5) is connected with additional voltage source (2).
11. scheme as claimed in claim 9 is characterized in that realizing current-limiting apparatus (5) by a fixed current generator.
12. scheme as claimed in claim 6 is characterized in that this scheme includes only a battery voltage source (4).
13. scheme as claimed in claim 9 is characterized in that current-limiting apparatus (5) comprises an adjuster (8) that the reference voltage (Vkr) that occurs is maintained fixed.
14. scheme as claimed in claim 6 is characterized in that realizing adaptive device (1) by a subscriber line interface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI961917A FI102934B1 (en) | 1996-05-06 | 1996-05-06 | Procedure and arrangement for raising onhook voltage |
| FI961917 | 1996-05-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1215525A true CN1215525A (en) | 1999-04-28 |
Family
ID=8545963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97193563 Pending CN1215525A (en) | 1996-05-06 | 1997-05-05 | Method and arrangement for increasing onhook voltage |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0894398A1 (en) |
| CN (1) | CN1215525A (en) |
| AU (1) | AU2640097A (en) |
| FI (1) | FI102934B1 (en) |
| WO (1) | WO1997042750A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3757052A (en) * | 1971-10-19 | 1973-09-04 | Electro Dynamics & Telecom Ltd | Telephone line extender with test thru capability |
| CA1157175A (en) * | 1981-02-20 | 1983-11-15 | Mitel Corporation | Power saving line circuit |
-
1996
- 1996-05-06 FI FI961917A patent/FI102934B1/en active
-
1997
- 1997-05-05 CN CN 97193563 patent/CN1215525A/en active Pending
- 1997-05-05 AU AU26400/97A patent/AU2640097A/en not_active Abandoned
- 1997-05-05 EP EP97918178A patent/EP0894398A1/en not_active Withdrawn
- 1997-05-05 WO PCT/FI1997/000268 patent/WO1997042750A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0894398A1 (en) | 1999-02-03 |
| FI961917A0 (en) | 1996-05-06 |
| AU2640097A (en) | 1997-11-26 |
| FI961917A (en) | 1997-11-07 |
| WO1997042750A1 (en) | 1997-11-13 |
| FI102934B (en) | 1999-03-15 |
| FI102934B1 (en) | 1999-03-15 |
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| C06 | Publication | ||
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |