CN107659737B - Telephone branching device - Google Patents

Telephone branching device Download PDF

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Publication number
CN107659737B
CN107659737B CN201611139878.9A CN201611139878A CN107659737B CN 107659737 B CN107659737 B CN 107659737B CN 201611139878 A CN201611139878 A CN 201611139878A CN 107659737 B CN107659737 B CN 107659737B
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telephone
resistor
voltage
following module
voltage following
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CN107659737A (en
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曾健礼
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SHENZHEN KILO-X ELECTRONIC Co Ltd
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SHENZHEN KILO-X ELECTRONIC Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/005—Interface circuits for subscriber lines
    • 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
    • H04M19/005—Feeding arrangements without the use of line transformers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention belongs to the technical field of telephone communication and provides a telephone branching device. The telephone branching device is connected with a local line, a first telephone and a second telephone and comprises a first unidirectional conductive device, a first voltage following module, a second unidirectional conductive device and a second voltage following module. The telephone branching device can transmit a feed signal or a ringing signal output by a local line to a first telephone or a second telephone through the first unidirectional conductive device, the second unidirectional conductive device, the first voltage following module and the second voltage following module with lower voltage loss and power loss, thereby realizing the purposes of low voltage loss and low power loss. Therefore, the telephone branching device of the invention has low voltage loss and power loss and low production cost.

Description

Telephone branching device
Technical Field
The invention belongs to the technical field of telephone communication, and particularly relates to a telephone branching device.
Background
The ringing signal in the telephone exchange is a high voltage, low frequency ac signal sent by the exchange to the called telephone. In order to make the called telephone have a ringing sound of sufficient loudness, it is generally required that the voltage of the ringing signal must be sufficiently high. At present, the voltage of the ringing signal output by the ringing signal source is generally 30V-90V, and the frequency is 25 Hz.
In order to be able to connect two telephones on a telephone line, telephone distribution boxes have come into force. Telephone junction boxes are widely used in the field of telephone communications as "bridges" for connecting switches and telephones. However, the existing telephone distribution box has many electronic devices and complicated circuits, and requires a large ringing signal to pass through to ring the telephone, which results in high circuit design cost, and large voltage loss and power loss.
Therefore, the existing telephone branching circuit has the problems of large voltage loss and power loss and high cost.
Disclosure of Invention
The invention provides a telephone branching device, aiming at solving the problems of large voltage loss and power loss and high cost of the existing telephone branching circuit.
The invention is realized in this way, a telephone branching device, which is connected with a local line, a first telephone and a second telephone, the telephone branching device includes:
the device comprises a first unidirectional conductive device, a first voltage following module, a second unidirectional conductive device and a second voltage following module;
the input end of the first unidirectional conductive device, the controlled end of the first voltage following module and the output end of the second voltage following module are connected with the first output end of the office line and the loop end of the second telephone together, the input end of the second unidirectional conductive device, the output end of the first voltage following module and the controlled end of the second voltage following module are connected with the second output end of the office line and the loop end of the first telephone together, the output end of the first unidirectional conductive device and the input end of the first voltage following module are connected with the input end of the first telephone together, and the output end of the second unidirectional conductive device and the input end of the second voltage following module are connected with the input end of the second telephone together;
when the first output end and the second output end of the office line output forward feed signals, the first unidirectional conductive device is conducted to enable the first telephone to work, and meanwhile, the second unidirectional conductive device is turned off, and the first voltage following module and the second voltage following module stop working; when the first output end and the second output end of the office line output backward feeding signals, the second unidirectional conductive device is conducted to enable the second telephone to work, and meanwhile, the first unidirectional conductive device is turned off, and the first voltage following module and the second voltage following module stop working;
when a first output end and a second output end of the office line output positive voltage ringing signals, the first one-way conductive device is conducted, the first voltage following module transmits the positive voltage ringing signals to the first telephone, and meanwhile, the second one-way conductive device is turned off, and the second voltage following module stops working; when the first output end and the second output end of the office line output negative voltage ringing signals, the second one-way conductive device is switched on, the second voltage following module transmits the negative voltage ringing signals to the second telephone, and meanwhile, the first one-way conductive device is switched off, and the first voltage following module stops working.
In the invention, the telephone branching device can transmit the feed signal or the ringing signal output by the office line to the first telephone or the second telephone through the first unidirectional conductive device, the second unidirectional conductive device, the first voltage following module and the second voltage following module with lower voltage loss and power loss, thereby realizing the purposes of low voltage loss and low power loss.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of a telephone distribution apparatus according to an embodiment of the present invention;
fig. 2 is a circuit structure diagram of a telephone distribution apparatus according to an embodiment of the present invention;
fig. 3 is a ring signal of positive voltage outputted from the office line according to the embodiment of the present invention;
fig. 4 is a ring signal of a negative voltage at the office line output according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a module structure of a telephone distribution apparatus 1 according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:
as shown in fig. 1, a telephone distribution apparatus 1 is connected to a central office line 2, a first telephone 3, and a second telephone 4. The telephone branching device 1 includes a first unidirectional conductive device 111, a first voltage following module 112, a second unidirectional conductive device 121, and a second voltage following module 122.
The input end of the first unidirectional conductive device 111, the controlled end of the first voltage following module 112 and the output end of the second voltage following module 122 are commonly connected to the first output end of the office line 2 and the loop end of the second telephone 4, the input end of the second unidirectional conductive device 121, the output end of the first voltage following module 112 and the controlled end of the second voltage following module 122 are commonly connected to the second output end of the office line 2 and the loop end of the first telephone 3, the output end of the first unidirectional conductive device 111 and the input end of the first voltage following module 112 are commonly connected to the input end of the first telephone 3, and the output end of the second unidirectional conductive device 121 and the input end of the second voltage following module 122 are commonly connected to the input end of the second telephone 4.
When the first output end and the second output end of the office line 2 output the forward feeding signal, the first unidirectional conductive device 111 is turned on to operate the first telephone 3, and at the same time, the second unidirectional conductive device 121 is turned off, and the first voltage following module 112 and the second voltage following module 122 stop operating; when the first output terminal and the second output terminal of the office line 2 output the backfeed signal, the second unidirectional conductive device 121 is turned on to operate the second telephone set 4, and at the same time, the first unidirectional conductive device 111 is turned off and the first voltage following module 112 and the second voltage following module 122 stop operating.
When the first output end and the second output end of the office line 2 output positive voltage ringing signals, the first one-way conductive device 111 is turned on, the first voltage following module 112 transmits the positive voltage ringing signals to the first telephone 3, and at the same time, the second one-way conductive device 121 is turned off, and the second voltage following module 122 stops working; when the first output terminal and the second output terminal of the office line 2 output the negative voltage ringing signal, the second unidirectional conductive device 121 is turned on, the second voltage following module 122 transmits the negative voltage ringing signal to the second telephone 4, and at the same time, the first unidirectional conductive device 111 is turned off, and the first voltage following module 112 stops working.
In the embodiment of the invention, the first telephone 3 and the second telephone 4 connected with the telephone branching device 1 respectively have two working states: when the office line 2 outputs a feeding signal, the first telephone 3 or the second telephone 4 operates in a feeding state, which is a state in which the first telephone 3 or the second telephone 4 operates normally after the office line 2 outputs a feeding voltage. The feeding signal is a dc voltage signal with a preset voltage value, wherein the forward feeding signal is a dc voltage signal with the second output terminal of the office line 2 as a reference ground, the level of the first output terminal of the office line 2 is always higher than that of the second output terminal, and the voltage difference between the first output terminal and the second output terminal of the office line 2 is the voltage value of the forward feeding signal; the negative feed signal is a dc voltage signal whose level of the second output terminal of the office line 2 is always higher than that of the first output terminal with the first output terminal of the office line 2 as a reference ground, and a voltage difference between the first output terminal and the second output terminal of the office line 2 is a voltage value of the positive feed signal. The feeding signal is, for example, a dc voltage signal of amplitude 48V. When the office line 2 outputs a ringing signal, the first telephone set 3 or the second telephone set 4 operates in a ringing state, which means that the office line 2 outputs the ringing signal to make the first telephone set 3 or the second telephone set 4 realize ringing. The ringing signal is a sine wave voltage signal with a preset amplitude and a preset frequency. The positive voltage ringing signal is the positive voltage ringing signal, which is formed by the voltage difference between the first output end and the second output end of the office line 2, wherein the second output end of the office line 2 is used as a reference ground, the level of the first output end of the office line 2 is always higher than that of the second output end; the negative voltage ringing signal is the one that uses the first output end of the office line 2 as the reference ground, the level of the second output end of the office line 2 is always higher than the level of the first output end, and the waveform formed by the voltage difference between the first output end and the second output end of the office line 2 is the negative voltage ringing signal. For example, the ringing signal is a sine wave signal with an amplitude of 30V to 90V and a frequency of 22Hz to 28Hz, for example, a sine wave signal with an amplitude of 30V and a frequency of 25 Hz. The principle of the telephone branching device and the operation states of the first telephone set 3 and the second telephone set 4 will be described below with reference to specific examples.
And (3) feeding state:
when the first output terminal and the second output terminal of the office line 2 output the forward feeding signal of 48V (i.e. the level of the first output terminal of the office line 2 is higher than the level of the second output terminal), the first unidirectional conductive device 111 is turned on to operate the first telephone set 3, and at the same time, the second unidirectional conductive device 121 is turned off, and the first voltage following module 112 and the second voltage following module 122 stop operating. At this time, the 48V forward feeding signal outputted from the office line passes through the first unidirectional conductive device 111, generates a small voltage loss, and is transmitted to the first telephone 3, so that the first telephone 3 operates normally. And the second telephone set 4 cannot normally operate due to the turn-off of the second unidirectional conducting device 121.
When the first output terminal and the second output terminal of the office line 2 output the backward feeding signal of 48V (i.e. the level of the second output terminal of the office line 2 is higher than the level of the first output terminal), the second unidirectional conductive device 121 is turned on to operate the second telephone set 4, and at the same time, the first unidirectional conductive device 111 is turned off, and the first voltage following module 112 and the second voltage following module 122 stop operating. At this time, the 48V feedback signal outputted from the office line passes through the second unidirectional conductive device 121, generates a small voltage loss, and is transmitted to the second telephone 4, so that the second telephone 4 operates normally. And the first telephone set 3 cannot normally operate due to the turn-off of the first unidirectional conductive device 111.
Ringing state:
as shown in fig. 3, when the first output end and the second output end of the office line 2 output sine wave ringing signals with amplitude of 30V (valley voltage value of 0V, peak voltage value of 60V) and frequency of 25Hz positive voltage, the first unidirectional conductive device 111 is turned on, the first voltage following module 112 transmits the ringing signal with positive voltage to the first telephone set 3, and the first telephone set 3 rings due to the conduction of the first unidirectional conductive device 111 and the operation of the first voltage following module 112; meanwhile, the second unidirectional current conducting device 121 is turned off, and the second voltage following module 122 stops working, so that the second telephone set 4 cannot ring due to the turning off of the second unidirectional current conducting device 121 and the stop of the second voltage following module 122.
As shown in fig. 4, when the first output terminal and the second output terminal of the office line 2 output the ringing signal with the amplitude of 30V (the valley voltage value is-60V, the peak voltage value is 0V) and the frequency of 25Hz negative voltage, the second unidirectional conductive device 121 is turned on, the second voltage following module 122 transmits the ringing signal with the positive voltage to the second telephone 4, and the second telephone 4 rings due to the conduction of the second unidirectional conductive device 121 and the operation of the second voltage following module 122; meanwhile, the first unidirectional conductive device 111 is turned off, and the first voltage following module 112 stops working, so that the first telephone 3 cannot ring due to the turning off of the first unidirectional conductive device 111 and the stop of the first voltage following module 112.
Therefore, the telephone distribution apparatus 1 in the embodiment of the present invention can transmit the feeding signal or the ringing signal output by the office line 2 to the first telephone 3 or the second telephone 4 with low voltage loss and power loss through the first unidirectional conductive device 111, the second unidirectional conductive device 121, the first voltage following module 112, and the second voltage following module 122, so as to achieve the purpose of low voltage loss and low power loss, and the telephone distribution apparatus 1 is composed of the unidirectional conductive device and the voltage following module, so that the production cost is low.
Fig. 2 shows a circuit configuration of the telephone distribution apparatus 1 according to the embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as an embodiment of the present invention, the first unidirectional conductive device 111 is a first diode D1, and the anode and the cathode of the first diode D1 are the input terminal and the output terminal of the first unidirectional conductive device 111, respectively.
As an embodiment of the present invention, the second unidirectional current conducting device 121 is a second diode D2, and the anode and the cathode of the second diode D2 are an input terminal and an output terminal of the second unidirectional current conducting device 121, respectively.
As an embodiment of the present invention, the first voltage follower module 112 includes: the circuit comprises a first resistor R1, a first PNP type triode Q1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first NPN type triode Q2.
A first end of the first resistor R1 is a controlled end of the first voltage follower module 112, a second end of the first resistor R1 is connected to a base of the first PNP transistor Q1, a collector of the first PNP transistor Q1 is connected to a first end of the second resistor R2, a second end of the second resistor R2 and a first end of the third resistor R3 are commonly connected to a base of the first NPN transistor Q2, a second end of the third resistor R3 and an emitter of the first NPN transistor Q2 are commonly connected to form an output end of the first voltage follower module 112, a collector of the first NPN transistor Q2 is connected to a first end of the fourth resistor R4, and an emitter of the first PNP transistor Q1 and a second end of the fourth resistor R4 are commonly connected to form an input end of the first voltage follower module 112.
As an embodiment of the present invention, the second voltage following module 122 includes: a fifth resistor R5, a second PNP transistor Q3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a second NPN transistor Q4.
A first end of the fifth resistor R5 is a controlled end of the second voltage follower module 122, a second end of the fifth resistor R5 is connected to a base of the second PNP transistor, a collector of the second PNP transistor Q3 is connected to a first end of the sixth resistor R6, a second end of the sixth resistor R6 and a first end of the seventh resistor R7 are commonly connected to a base of the second NPN transistor Q4, a second end of the seventh resistor R7 and an emitter of the second NPN transistor Q4 are commonly connected to form an output end of the second voltage follower module 122, a collector of the second NPN transistor Q4 is connected to a first end of the eighth resistor R8, and an emitter of the second PNP transistor Q3 and a second end of the eighth resistor R8 are commonly connected to form an input end of the second voltage follower module 122.
The telephone branching device is further described by combining the working principle as follows:
and (3) feeding state:
when the first output terminal and the second output terminal of the office line 2 output dc voltage signals with preset voltage values, for example, the first output terminal and the second output terminal of the office line 2 output forward feeding signals of 48V dc voltage signals (that is, the level of the first output terminal of the office line 2 is higher than that of the second output terminal), at this time, the first diode D1 is turned on and the second diode D2 is turned off, the resistances of the first resistor R1 and the fifth resistor R5 are set to be large, for example, the resistances of the first resistor R1 and the fifth resistor R5 are both set to be 100K ohms. The first diode D1 is turned on, so that the first input end of the office line 2, the first diode D1, the first telephone 3 and the second input end of the office line 2 form a loop, and the first telephone 3 is fed with power to work normally; although the first input terminal of the office line 2, the second telephone 4, the emitter and the base of the second PNP transistor Q3, the fifth resistor R5, and the first input terminal of the office line also form a loop, the resistance of the fifth resistor R5 is 100K ohms, so that the current in the loop is small and insufficient to operate the second telephone 4, and the second diode D2 is turned off, so that the second telephone 4 cannot operate normally. At this time, the first PNP transistor Q1, the first NPN transistor Q2, the second PNP transistor Q3, and the second NPN transistor Q4 are all in the off state.
When the first output terminal and the second output terminal of the office line 2 output dc voltage signals with preset voltage values, for example, the first output terminal and the second output terminal of the office line 2 output reverse feeding signals of dc voltage signals of-48V (i.e., the level of the second output terminal of the office line 2 is higher than the level of the first output terminal), at this time, the second diode D2 is turned on and the first diode D1 is turned off, and since the second diode D2 is turned on, the second input terminal of the office line 2, the second diode D2, the second telephone 4 and the first input terminal of the office line 2 form a loop, so that the second telephone 4 can normally operate with feeding; although the second input terminal of the office line 2, the first telephone 3, the emitter and the base of the first PNP transistor Q1, the first resistor R1, and the first input terminal of the office line also form a loop, the first resistor R1 has a resistance of 100K ohms, so that the current in the loop is small and is not enough to operate the first telephone 3, and the first diode D1 is turned off, so that the first telephone 3 cannot operate normally. At this time, the first PNP transistor Q1, the first NPN transistor Q2, the second PNP transistor Q3, and the second NPN transistor Q4 are all in the off state.
Therefore, the telephone branching device 1 in the embodiment of the present invention can transmit the feed signal output from the office line 2 to the first telephone 3 or the second telephone 4 with low voltage loss and power loss through the first diode D1 and the second diode D2, thereby achieving the purpose of low voltage loss and low power loss. The telephone branching device 1 is composed of a diode, a triode and a resistor, and has simple structure and lower production cost.
Ringing state:
as shown in fig. 3, when the first output terminal and the second output terminal of the office line 2 output the sine-wave ringing signal with a positive voltage of 25Hz and a magnitude of 30V (a valley voltage value of 0V and a peak voltage value of 60V) (i.e., the level of the first output terminal of the office line 2 is always higher than that of the second output terminal with the second output terminal of the office line 2 as a reference ground), the first diode D1 is turned on and the second diode D2 is turned off. The sine wave signal in fig. 3 is the level difference between the first output terminal and the second output terminal of the office line 2. As shown in fig. 3, during the period from the trough to the peak, the first PNP transistor Q1, the first NPN transistor Q2, the second PNP transistor Q3, and the second NPN transistor Q4 are all in the off state, and due to the conduction of the first diode D1, the level of the input terminal of the first telephone 3 changes with the level of the first input terminal of the office line 2, and the relationship between the two is: the level of the input terminal of the first telephone set 3 is approximately equal to the level of the first output terminal of the office line 2 minus 0.7V (i.e., the turn-on voltage of the first diode D1). During the peak-to-valley period, the first PNP transistor Q1, the first NPN transistor Q2 are in a conducting state, and the first PNP transistor Q1, the first NPN transistor Q2, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 constitute a voltage follower circuit, so that the level of the input terminal of the first telephone 3 changes with the change of the level of the first input terminal of the office line 2, and due to the conduction of the first PNP transistor Q1, the relationship between the level of the input terminal of the first telephone 3 and the level of the first input terminal of the office line 2 is: the level of the input terminal of the first telephone set 3 is approximately equal to the level of the first input terminal of the office line 2 plus 0.7V (the on voltage of the PN junction between the emitter and the base of the first PNP transistor Q1). The difference between the voltages applied to the input terminal and the loop terminal of the first telephone 3 is the voltage across the first telephone 3, and the level of the input terminal of the first telephone 3 is the voltage across the first telephone 3 because the loop terminal of the first telephone 3 is connected to the second input terminal of the office line 2 with the second input terminal of the office line 2 as a reference ground. As can be seen from the above analysis, the ringing signals at the first output terminal and the second output terminal of the office line 2 can be transmitted to the two terminals of the first telephone set 3 more completely, and the voltage loss is smaller, which is about 2V, and therefore the power loss is also smaller. And the second telephone set 4 cannot ring because the second diode D2 is in the off state.
As shown in fig. 4, when the first output terminal and the second output terminal of the office line 2 output the sine-wave ringing signal with the amplitude of 30V (the valley voltage value is-60V, the peak voltage value is 0V) and the frequency of 25Hz negative voltage (i.e. the level of the second output terminal of the office line 2 is always higher than that of the first output terminal with the first output terminal of the office line 2 as the reference ground), the second diode D2 is turned on and the first diode D1 is turned off. The sine wave signal in fig. 4 is the level difference between the first output terminal and the second output terminal of the office line 2. As shown in fig. 4, during the period from the trough to the peak, the first PNP transistor Q1, the first NPN transistor Q2, the second PNP transistor Q3, and the second NPN transistor Q4 are all in the off state, and due to the conduction of the second diode D2, the level of the input terminal of the second telephone 4 changes with the level of the second input terminal of the office line 2, and the relationship between the two is: the level of the input of the second telephone 4 is approximately equal to the level of the second output of the office line 2 minus 0.7V (i.e. the turn-on voltage of the second diode D2). During the peak-to-valley period, the second PNP transistor Q3, the second NPN transistor Q4 are in a conducting state, and the second PNP transistor Q3, the second NPN transistor Q4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 constitute a voltage follower circuit, so that the level of the input terminal of the second telephone 4 changes with the change of the level of the second input terminal of the office line 2, and due to the conduction of the second PNP transistor Q3, the relationship between the level of the input terminal of the second telephone 4 and the level of the second input terminal of the office line 2 is: the level of the input terminal of the second telephone set 4 is approximately equal to the level of the second input terminal of the office line 2 plus 0.7V (the on voltage of the PN junction between the emitter and the base of the second PNP transistor Q3). The difference between the voltages applied to the input terminal and the loop terminal of the second telephone 4 is the voltage across the second telephone 4, and the level of the input terminal of the second telephone 4 is the voltage across the second telephone 4, with the first input terminal of the office line 2 as the reference ground, since the loop terminal of the second telephone 4 is connected to the first input terminal of the office line 2. As can be seen from the above analysis, the ringing signals at the first output terminal and the second output terminal of the office line 2 can be transmitted to the two terminals of the second telephone set 4 more completely, and the voltage loss is smaller, which is about 2V, and therefore the power loss is also smaller. And the first telephone set 3 cannot ring because the first diode D1 is in the off state.
Therefore, the telephone branching device 1 in the embodiment of the present invention can transmit the ringing signal output by the office line 2 to the first telephone 3 or the second telephone 4 with low voltage loss and power loss through the first diode D1, the second diode D2, the first voltage following module 112 composed of a triode and a resistor, and the second voltage following module 122, so as to achieve the purpose of low voltage loss and low power loss, and the telephone branching device 1 is composed of a diode, a triode, and a resistor, and has a simple structure and low production cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. A telephone branching device connected to a central office line, a first telephone and a second telephone, the telephone branching device comprising:
the device comprises a first unidirectional conductive device, a first voltage following module, a second unidirectional conductive device and a second voltage following module;
the input end of the first unidirectional conductive device, the controlled end of the first voltage following module and the output end of the second voltage following module are connected with the first output end of the office line and the loop end of the second telephone together, the input end of the second unidirectional conductive device, the output end of the first voltage following module and the controlled end of the second voltage following module are connected with the second output end of the office line and the loop end of the first telephone together, the output end of the first unidirectional conductive device and the input end of the first voltage following module are connected with the input end of the first telephone together, and the output end of the second unidirectional conductive device and the input end of the second voltage following module are connected with the input end of the second telephone together;
when the first output end and the second output end of the office line output forward feed signals, the first unidirectional conductive device is conducted to enable the first telephone to work, and meanwhile, the second unidirectional conductive device is turned off, and the first voltage following module and the second voltage following module stop working; when the first output end and the second output end of the office line output backward feeding signals, the second unidirectional conductive device is conducted to enable the second telephone to work, and meanwhile, the first unidirectional conductive device is turned off, and the first voltage following module and the second voltage following module stop working;
when a first output end and a second output end of the office line output positive voltage ringing signals, the first one-way conductive device is conducted, the first voltage following module transmits the positive voltage ringing signals to the first telephone, and meanwhile, the second one-way conductive device is turned off, and the second voltage following module stops working; when the first output end and the second output end of the office line output negative voltage ringing signals, the second one-way conductive device is switched on, the second voltage following module transmits the negative voltage ringing signals to the second telephone, and meanwhile, the first one-way conductive device is switched off, and the first voltage following module stops working.
2. The telephone line splitting apparatus of claim 1 wherein said first unidirectional current conducting device is a first diode, and wherein the anode and cathode of said first diode are the input and output terminals, respectively, of said first unidirectional current conducting device.
3. The telephone distribution apparatus of claim 1 wherein the second unidirectional current conducting device is a second diode, and wherein the anode and cathode of the second diode are the input and output terminals, respectively, of the second unidirectional current conducting device.
4. The telephone distribution apparatus of claim 1, wherein the first voltage follower module comprises:
the circuit comprises a first resistor, a first PNP type triode, a second resistor, a third resistor, a fourth resistor and a first NPN type triode;
the first end of the first resistor is a controlled end of the first voltage following module, the second end of the first resistor is connected with a base electrode of the first PNP type triode, a collector electrode of the first PNP type triode is connected with the first end of the second resistor, the second end of the second resistor and the first end of the third resistor are connected to the base electrode of the first NPN type triode in a sharing mode, the second end of the third resistor and an emitter electrode of the first NPN type triode are connected in a sharing mode to form an output end of the first voltage following module, the collector electrode of the first NPN type triode is connected with the first end of the fourth resistor, and the emitter electrode of the first PNP type triode and the second end of the fourth resistor are connected in a sharing mode to form an input end of the first voltage following module.
5. The telephone distribution apparatus of claim 1, wherein the second voltage follower module comprises:
the first NPN type triode is connected with the sixth resistor and the eighth resistor;
the first end of the fifth resistor is a controlled end of the second voltage following module, the second end of the fifth resistor is connected with a base electrode of the second PNP type triode, a collector electrode of the second PNP type triode is connected with the first end of the sixth resistor, the second end of the sixth resistor and the first end of the seventh resistor are connected to the base electrode of the second NPN type triode in a sharing mode, the second end of the seventh resistor and an emitter electrode of the second NPN type triode are connected in a sharing mode to form an output end of the second voltage following module, the collector electrode of the second NPN type triode is connected with the first end of the eighth resistor, and the emitter electrode of the second PNP type triode and the second end of the eighth resistor are connected in a sharing mode to form an input end of the second voltage following module.
CN201611139878.9A 2016-12-12 2016-12-12 Telephone branching device Active CN107659737B (en)

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CN1518793A (en) * 2001-04-23 2004-08-04 ����ɭ�绰�ɷ����޹�˾ Automatic optimization of linearity for envelope feedback amplifier linearization
US7139391B2 (en) * 2001-10-30 2006-11-21 Integration Associates, Inc. DAA hook switch
US8411848B2 (en) * 2008-11-11 2013-04-02 Uniden Corporation Telephone interface circuit for providing over-current and over-voltage protection
CN203606667U (en) * 2013-08-02 2014-05-21 安美世纪（北京）科技有限公司 Wireless intelligent central control system for hotel guest rooms
CN104345704A (en) * 2013-08-02 2015-02-11 安美世纪（北京）科技有限公司 Wireless intelligent central control system of hotel rooms and control method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1518793A (en) * 2001-04-23 2004-08-04 ����ɭ�绰�ɷ����޹�˾ Automatic optimization of linearity for envelope feedback amplifier linearization
US7139391B2 (en) * 2001-10-30 2006-11-21 Integration Associates, Inc. DAA hook switch
US8411848B2 (en) * 2008-11-11 2013-04-02 Uniden Corporation Telephone interface circuit for providing over-current and over-voltage protection
CN203606667U (en) * 2013-08-02 2014-05-21 安美世纪（北京）科技有限公司 Wireless intelligent central control system for hotel guest rooms
CN104345704A (en) * 2013-08-02 2015-02-11 安美世纪（北京）科技有限公司 Wireless intelligent central control system of hotel rooms and control method thereof

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