CN201042056Y

CN201042056Y - Phone switching caller

Info

Publication number: CN201042056Y
Application number: CNU2006200122777U
Authority: CN
Inventors: 林建益
Original assignee: SPECIAL ENTERPRISE CO Ltd
Current assignee: SPECIAL ENTERPRISE CO Ltd
Priority date: 2006-04-25
Filing date: 2006-04-25
Publication date: 2008-03-26
Anticipated expiration: 2016-04-25

Abstract

The utility model provides a telephone exchange calling device comprising a power telephone circuit, a signal receiving circuit, a control cell and a signal generating circuit. The utility model consumes no power by utilizing a switch component and a resistance. When in use, the utility model also consumes extremely low power. The telephone exchange calling can be achieved through the power supplied by a telephone without any other outside power supplies or batteries. The utility model can be operated through the power of a telephone wire, so that the customer presses the button, and sends a signal calling to at least one telephone exchange calling device which is positioned on the telephone wire to produce sound so as to inform people to pick up the telephone for answering.

Description

The telephone exchange calling set

Technical field

The utility model relates to a kind of telephone exchange calling set, and particularly a kind of power consumption is little, does not need external power supply or battery, the telephone exchange calling set of power work that can telephone line.

Background technology

General telephone subscriber, a line telephone number usually just is equipped with the telephone set more than two, all can receive calls the user in the chummery not to make things convenient for multidigit.For making after a certain people receives calls, can give other people with call forwarding easily, notify other people except the mode that direct usefulness is cried out, switch is installed on telephone line exactly.

Interphone network layout with switch can be divided into two big classes, wherein the first kind is to belong to radial wiring, as shown in Figure 1, must on the source in the outside line inlet chamber 60, pull out a telephone wire, and install a switch 62, extension of every installation is just pulled out telephone wire and is connected telephone socket 64 from switch 62, and on telephone socket 64 installation extension set 66.The prerequisite that adopts this wiring method is that the constructor must know the source 60 in the telephone wire inlet chamber, yet, be not that all make telephonic people all know the interior source of own employed telephone wire inlet chamber, even telephone socket just installs when many new houses are built, only needs the application telephone number that the telephone wire insertion telephone socket of telephone set is got final product, do not know the source, so this wire laying mode is not that everybody implements easily.

The second class wire laying mode then is a dispersed, and is many easily than the first kind, and at first as shown in Figure 2, directly the telephone set 68 that installing has function of exchange on telephone line inserts the telephone socket 64 that originally promptly has; Secondly as shown in Figure 3, add the device 70 with function of exchange between telephone socket and telephone set, can reach the purpose of telephone exchange, and form of construction work is simple, common people can both finish smoothly voluntarily.

Yet in the prior art,, all need external power supply or device battery, so that this switch can be worked no matter be the telephone set or the switch of tool function of exchange in the switch of radial wiring, the distributed wiring.As device battery work, whether its inside has one usually and detects circuit and detect phone transmitter and picked up, and is then started power supply if pick up, so that switch work, on the contrary powered-down then, to save the electric energy of battery., the microphone time length of picking up conversation varies with each individual; If phone user custom is said phone and says for a long time that then battery will not have electricity soon and make switch lose efficacy, real in the use genus inconvenience.

The utility model content

At above the deficiencies in the prior art, main purpose of the present utility model provides a kind of telephone exchange calling set, and a power supply telephone line just is provided, and makes the utility model can utilize the online power work of phone, does not need external power supply or battery.

Another purpose of the present utility model provides a kind of telephone exchange calling set, can change the online voltage of phone, utilizes change in voltage to transmit signal.

The 3rd purpose of the present utility model provides a kind of telephone exchange calling set, and it can and be enlarged into more tractable signal with modulating signal, carries out interpretation for microcontroller.

For reaching above-mentioned purpose, the utility model provides a kind of telephone exchange calling set, comprising:

One power supply telephone line connects at least one phone, is used for the transmitting telecommunication signal, and with this power supply telephone line as the power supply supply, to produce the required power supply of each assembly;

One signal receiving circuit, it connects this power supply telephone line, and the telecommunications signal changing that this power supply telephone line is transmitted is more tractable input signal;

One control unit, it connects this power supply telephone line and this signal receiving circuit, is used for handling the input signal that this signal receiving circuit transmits, and the user also can send instruction from this control unit and send controlling signal; And

One signal generating circuit, itself and this control unit and this power supply telephone line join, and produce corresponding signal after receiving from the controlling signal of this control unit, and transfer out by this telephone line.

This signal receiving circuit comprises a comparator and a low pass filter.

This low pass filter is made up of resistance and an electric capacity, and it is the HFS filtering in the telecommunications signal, and the low frequency part of telecommunications signal is sent to the negative terminal/anode of this comparator, and former telecommunications signal then is sent to the anode/negative terminal of this comparator.

This signal generating circuit comprises a switch and a resistance.

This control unit comprises a microcontroller, an electric capacity, a sounding component, at least one resistance and a guidance panel, and this guidance panel is provided with at least one button.

This microcontroller can detect the state of this button, and the user can assign instruction by this button and give this microcontroller.

This sounding component can be when having the telecommunications signal to import this telephone line, sounded by the variation of voltage and notify the user.

This input signal is to have more tractable change in voltage after this telecommunications signal changing amplifies.

When this phone does not connect time-out, this control unit is an off-position, to avoid unnecessary power consumption and load, connect time-out and work as this phone, this control unit is powered, and can make corresponding action according to this button, by this signal receiving circuit and this signal generating circuit signal is handled.

Comprise a comparator in this microcontroller.

Implement the utility model, can utilize the online power work of phone, do not need external power supply or battery, also can change the online voltage of phone, utilize change in voltage to transmit signal, also can and be enlarged into more tractable signal, carry out interpretation for microcontroller with modulating signal.

Description of drawings

Fig. 1 to Fig. 3 is the prior art constructions schematic diagram.

Fig. 4 is a schematic diagram of the present utility model.

Fig. 5 is the schematic diagram of power supply telephone line in the utility model.

Fig. 6 is the schematic diagram of signal generating circuit in the utility model.

Fig. 7 is the schematic diagram of signal receiving circuit in the utility model.

Fig. 8 is the curve chart of comparator transmission end and receiving end signal waveform in the signal receiving circuit of the present utility model.

Fig. 9 is the schematic diagram of control unit in the utility model.

Among the figure:

10 power supply telephone lines, 102 telephone wires

1022 voltage sources, 104 telephone sets

1042 switches, 106 bridge rectifier circuits

120,122,124,126 transistors

130,132,134,136,138 voltage nodes

140,142,144,146 control end points

150,152 end points

20 signal generating circuits, 21 switches

24,26 control end points, 28 end points

30 signal receiving circuits, 31 comparators

33 electric capacity, 34,35,36 control end points

38 end points, 40 control units

41 microcontrollers, 42 electric capacity

44 sounding components, 48 buttons

50 power pins, 52,54,56 control end points

58 end points, 60 sources

62 switches, 64 telephone sockets

The telephone set that 66 telephone sets 68 have function of exchange

70 switches

Embodiment

The utility model provides a kind of telephone exchange calling set, its effect and the switch 70 that the position is equal to Fig. 3 is set.Framework of the present utility model as shown in Figure 4, comprise a power supply telephone line 10, a signal receiving circuit 30, a control unit 40 and a signal generating circuit 20, wherein power supply telephone line 10 is the wiring of local telephone, except the transmitting telecommunication signal, also can utilize the electric power of telephone wire to install the power supply of each assembly as this; Signal receiving circuit 30 is more tractable input signal with the telecommunications signal changing that power supply telephone line 10 is transmitted; Control unit 40 comprises a microcontroller and operation-interface, and in order to the input signal that processing signals receiving circuit 30 is received, the user can send instruction by the button on the operation-interface, sends serial signal by signal generating circuit 20.

Fig. 5 is the schematic diagram of power supply telephone line, wherein the voltage source 1022 that comprised of the round dotted line of upper left side Elliptical and resistance R 1 can equivalence be considered as the outside line 102 of telecommunication bureau, switch 1042 that the lower left round dotted line of Elliptical is comprised and resistance R 2 then can equivalence be considered as telephone set 104, and wherein voltage source 1022 input voltages are V.When the microphone of telephone set was hung, not when in use promptly, switch 1042 was for what disconnect, and voltage node 130 promptly equals V with respect to the magnitude of voltage of end points 152, and the voltage node 130 of this moment is in relative high-voltage state; When the microphone of telephone set is picked up, in the time of promptly in conversation, switch 1042 is a short circuit.So voltage node 130 is V*R2/ (R1+R2) with respect to the magnitude of voltage of end points 152 because the value of R2/ (R1+R2) is less than 1, so this moment voltage node 130 with respect to the magnitude of voltage of end points 152 less than V, that is voltage node 130 is the state of relative low-voltage.

In this power supply telephone line, other includes a bridge rectifier circuit 106, a plurality of resistance R 4, R5, R6, R7, R8, R9, R10, R11, a plurality of transistor 120,122,124,126; A plurality of voltage nodes 130,132,134,136,138, its magnitude of voltage is respectively V0, V1, V2, V3, V4; A plurality of control end points 140,142,144,146 and a plurality of end points 150,152, its terminal voltage is respectively G, G0.

The effect of bridge rectifier circuit 106 is, no matter voltage node 130 is a plus or minus with respect to the voltage of end points 152, all can guarantee voltage node 132 with respect to the current potential of end points 150 for just, so that the circuit operate as normal of its back.Therefore, if voltage node 130 with respect to the voltage of end points 152 be on the occasion of, that is voltage node 130 can be considered as and voltage node 132 short circuits at this moment, its magnitude of voltage is identical;

End points

150 and 152 short circuits, its magnitude of voltage is identical, i.e. V0=V1, G0=G, in other words, voltage node 132 is with respect to the voltage of end points 150, also as the voltage of voltage node 130 with respect to end points 152, when the microphone of telephone set was hung, its value was V, was in the state of relatively high pressure; And, being in the state of relatively low pressure when the microphone of telephone set is picked up, its value is V*R2/ (R1+R2).

Power supply telephone line 10 can consume few electric weight or cut out when voltage node 130 is in high-tension state relatively, and starts when being in the state of relative low-voltage, and the circuit of side begins power supply to being positioned at thereafter.The design principle of its circuit is described as follows:

Transistor 120,122,124,126 has three end points, and can and control end points 146 voltages with its other two-end-point short circuit or open circuit because of corresponding voltage node 134,136,138.

Wherein transistor

120 and 122 is the transistor of same type, can be because the voltage of its control end points be higher and with other two-end-point short circuit, on the contrary open circuit then; And transistor 124 is the transistor of another type, and meeting is low with other two-end-point short circuit because of voltage of its control end points, otherwise then opens a way; But transistor 126 is controlled by microcontroller owing to elasticity, thus can belong to any class among above-mentioned two classes, or two class components combine thus.

Voltage node 134 is V1*R5/ (R4+R5) with respect to the voltage of end points 150, that is the voltage of voltage node 134 is proportional to the voltage of voltage node 132, and higher as the voltage V1 of voltage node 132, then the voltage V2 of voltage node 134 is also higher, otherwise then lower.Learn that by aforementioned when the microphone of telephone set was hung, the voltage of voltage node 132 was higher; Then voltage was lower when microphone was picked up.Therefore, hung when the microphone of telephone set, the voltage of voltage node 134 is also higher, and its voltage was also lower when microphone was picked up.Via suitable selection to resistance R 4 and R6 ratio, can allow the magnitude of voltage of voltage node 134 when the microphone of telephone set is hung, just in time reach height, make the other two-end-point short circuit of transistor 120; And the magnitude of voltage of voltage node 134 causes the other two-end-point open circuit of transistor 120 just in time enough low when the microphone of telephone set is picked up.Simultaneously, for the other two-end-point that makes transistor 120 all has extremely low power consumption, the resistance value of resistance R 4, R6 and R5 all to want greatly regardless of short circuit or open circuit, be generally millions of ohms.

When the two-end-point of transistor 120 is short circuit, the control voltage node 136 of transistor 122 promptly is shorted to end points 150 via transistor 120, that is voltage node 136 is 0 with respect to the voltage of end points 150, thus this moment transistor 122 other two-end-point open a way.And when the two-end-point of transistor 120 is open circuit, voltage node 136 is V1*R7/ (R6+R7) with respect to the magnitude of voltage of end points 150, that is the two-end-point of transistor 120 be open circuit under the prerequisite, when the voltage of voltage node 132 was higher, the two-end-point of transistor 122 can short circuit; And under identical prerequisite, when the voltage of voltage node 132 hanged down, the two-end-point of transistor 122 can be opened a way.

Therefore, comprehensive above argumentation can be learnt, when the resistance value selection of resistance R 4, R5, R6, R7 is suitable, can accomplish following situation: when magnitude of voltage for the highest the time, because the voltage of the control voltage node 134 of transistor 120 is higher, and make the two-end-point short circuit of transistor 120, i.e. the control voltage node 136 of transistor 122 thereby be shorted to end points 150 by transistor 120, and make that its value is 0, and then make the two-end-point of transistor 122 open a way.When magnitude of voltage is reduced to some positions standard,, and make the two-end-point of transistor 120 open a way because control voltage node 134 voltages of transistor 120 are on the low side.Yet the magnitude of voltage that this moment, voltage node 136 came because of resistance R 6 and R7 dividing potential drop is still higher, thereby makes that the two-end-point of transistor 122 is short circuits.When magnitude of voltage further is lower than some positions accurate the time again,, thereby make the two-end-point of transistor 122 open a way because the magnitude of voltage that this moment, voltage node 136 came because of resistance R 6 and R7 dividing potential drop is on the low side.

As from the foregoing, when voltage dropped to 0V by peak one tunnel, the connection status of transistor 122 two-end-points was divided into for three stages, and the phase I is open circuit, the second stage short circuit, and the phase III opens a way again.When the two-end-point of transistor 122 is open circuit, the magnitude of voltage of the control voltage node 138 of transistor 124 equals the magnitude of voltage of voltage node 132, belong to high-voltage state, can cause its other two-end-point open circuit, make control end points 142 thereafter can not get power supply transistor 124.And when the two-end-point of transistor 122 is short circuit, the magnitude of voltage of voltage node 138 is V1*R9/ (R8+R9) with respect to the magnitude of voltage of end points 150, belong to low-voltage state, can cause its other two-end-point short circuit, make control end points 142 thereafter obtain power supply transistor 124.The resistance value of resistance R 8 and R9 then under transistor 124 can normal in check prerequisite, is selected bigger value as far as possible.The microcontroller circuit that is connected control end points 144 is then powered by resistance R 10 or transistor 126 and resistance R 11 by Control Node 142.

Comprehensive above argumentation as can be known, when voltage dropped to 0V by peak one tunnel, the power supply status of microcontroller circuit was divided into for three stages, the phase I there is not electricity, second stage has electricity, the phase III does not have.Each stage divides other to act as: when phone transmitter is hung, be the phase I, microcontroller circuit is de-energized, and avoids unnecessary power consumption, also avoids telephone line is caused load.When phone transmitter is picked up, be second stage, microcontroller circuit is powered, and is in and receives data or button to make the state of corresponding action.When the telecommunications room because of a telephone set and a distant place causes resistance R 1 too big because distance is oversize, more and then cause the voltage V0 and the V1 of the voltage node 130,132 that resistance R 1 and R2 dividing potential drop come out not high enough, be not enough to allow the microcontroller that is connected in Control Node 144 when regular event, stop power supply; Perhaps, when the utility model just has been linked in the telephone line, the rising of just having walked unhurriedly of the voltage of voltage node 132, but when being not enough to allow the microcontroller operate as normal, make it be in the phase III and stop power supply, to avoid under the situation of power supply reluctantly the issuable malfunction of microcontroller.

In addition, when the two-end-point short circuit of transistor 124, the magnitude of voltage of voltage node 132 can be determined by the equivalent resistance of resistance R 1, R2, R4, R5, R6, R7, R8, R9, R10 and microcontroller, because resistance R 4, R5, R6, R7, R8, R9 are all very big with respect to resistance R 1 and R2, therefore minimum to the magnitude of voltage influence of voltage node 132, it can be ignored.And under the poorest situation, the equivalent resistance of supposing microcontroller is 0, and then the total resistance value after the resistance R 10 series connection microcontrollers is resistance R 10 former resistance values.This moment, the voltage of voltage node 132 was determined by resistance R 1, R2 and R10, its value is: V* (R2//R10)/(R1+R2//R10), wherein the value of R2//R10 is 1/ (1/R2+1/R10), because R10 is much larger than R2, therefore the value of R2//R10 approaches 1/ (1/R2), promptly equal R2, so the time V1 value be V* (R2//R10)/(R1+R2//R10), approach V*R2/ (R1+R2), that is the voltage V0 of voltage node 130 almost is constant loading onto front and back of the present utility model, so the utility model is very little to the influence that telephone network causes.As from the foregoing, the resistance R 10 that transistor 124 right-hand members are connected between the control end points 144 will be selected maximum as far as possible, as long as after 10 step-downs of the voltage of voltage node 132 process resistance R, still be enough to allow the microcontroller operate as normal that is connected to control end points 144 get final product, and the microcontroller power consumption that the utility model adopted is extremely low, just be 10 times of resistance R 2 in telephone set of resistance value of resistance R 10, this microcontroller is worked normally.

At last, the effect of top-right transistor 126 and resistance R 11 is in Fig. 5, if some relatively power consumption of work that the microcontroller that its rear end connect is performed, when only powering the meeting deficiency via resistance R 10, then can control this control end points 146, first shorted on both ends with transistor 126 before the work of power consumption is carried out provides bigger electric current to microcontroller circuit via resistance R 11.After the work of power consumption is finished, opened a way in the two ends of transistor 126 again.Though when coming the microcontroller line powering,, can bigger influence be arranged to the voltage of telephone network (being voltage node 132) because the resistance value of resistance R 11 is less via transistor 126 and resistance R 11; But, because generally only when the big volume of need notifies the user to answer the call, just can need the two-end-point short circuit of bigger power consumption stream with transistor 126, be not need to converse by telephone network, even therefore to the influential puzzlement that also can not cause in the use of telephone network usually at this moment.Transistor 126 two ends are all open circuit at ordinary times, extremely small to its influence that causes by the aforementioned telephone network of the utility model as can be known.

Can be learnt by above argumentation: the utility model connects after the telephone line network, when mouthpiece hangs up, can consume the electricity of telephone wire hardly at ordinary times, to the almost not influence of original telephone line network; When mouthpiece is picked up, although the utility model can consume the electricity of telephone wire, because the used very power saving of microcontroller of the utility model, and at its power end sizable resistance of having contacted, therefore, the influence to original telephone line network also is very little.

Fig. 6 is the schematic diagram of signal generating circuit in the utility model, is made of switch 21 and resistance R 3, and this switch 21 can be a transistor.Control end points 24 among the figure and end points 28 can be received control end points 140 and the end points 150 among Fig. 5.When the control end voltage of switch 21 was higher, its other two-end-point will short circuit, otherwise will open a way, therefore, switch 21 from control end points 26 receive come from microcontroller signal the time, if the voltage of control end points 26 is than switch 21 height, then the two-end-point of switch 21 is understood short circuit, otherwise will open a way.

Because resistance R 4 among Fig. 5, R5, R6, R7, R8, R9 are all big a lot of with respect to the resistance among resistance R 1, R2 and Fig. 6, relatively all minimum to the voltage influence of voltage node 132, resistance R 4, R5, R6, R7, R8, R9 are omitted in therefore following argumentation.

When the two-end-point short circuit of the higher and switch 21 of voltage of control end points 26, the magnitude of voltage V1 that can get voltage node 132 among Fig. 5 is about V* (R2//R3)/(R1+R2//R3), and when the two-end-point of the lower and switch 21 of voltage of control end points 26 during for open circuit, V1 is the V*R2/ (R1+R2) that had before touched upon, that is the voltage height of control end points 26 then the voltage of voltage node 132 is low, the low then voltage height of voltage node 132 of the voltage of control end points 26, therefore, the magnitude of voltage V1 of voltage node 132 can change along with the voltage height of control end points 26, and this change in voltage is sent outward along with telephone wire, has promptly constituted the signal of unofficial biography.

Fig. 7 is made of comparator 31, resistance R 12 and electric capacity 33 for the schematic diagram of signal receiving circuit among the present invention.Control end points 34 among the figure and end points 38 can be received control end points 142 and the end points 150 among the 5th figure.As the known comparator of industry, when the signal voltage of receiving when these comparator 31 anodes is higher than negative terminal, its high voltage signal that output control end points 35 can be sent and the comparator 31 supply voltage position that connects is accurate identical, otherwise then send no-voltage.Resistance R 12 and electric capacity 33 are formed low pass filter, can will allow the high frequency composition of the signal that sends via electric capacity 33 filterings, and the low frequency composition is delivered to the negative terminal of comparator 31, that is pass the anode that the signal of coming in can intactly be sent comparator 31 to from control end points 34, only have and it seems and change the negative terminal that gentle many low frequency compositions can be passed comparator 31 than script signal.Therefore, the signal of receiving at comparator 31 anodes changes because of the composition that still contains high frequency more violent, and the signal that negative terminal is received variation is comparatively gentle because of the composition that only remains low frequency, so, the signal voltage of receiving when the anode of comparator 31 is when being in high relatively point, the signal voltage height that its magnitude of voltage can be received than comparator 31 negative terminals, and the signal voltage of receiving when the anode of comparator 31 is when being in relative low spot, and its magnitude of voltage can be lower than the signal voltage that negative terminal is received.

When another the utility model that is arranged in same telephone network influenced its magnitude of voltage V1 owing to the change in voltage of its Fig. 6 control end points 26, the variation of its V1 voltage also can cause this V1 change in voltage of the present utility model.The variation of V1 voltage is directly passed to comparator 31 anodes among Fig. 7 via transistor among Fig. 5 124 and control end points 142, and passes to the negative terminal of comparator 31 simultaneously via resistance R 12.

Fig. 8 is the signal schematic representation of the comparator 31 among Fig. 7, comprise the input signal a that anode receives control end points 34, the low pass filter of being made up of resistance R 12 and electric capacity 33 of negative terminal is handled the back by the input signal b of control end points 36 inputs with by the output signal c of control end points 35 outputs.Therefore, utilize this signal receiving circuit, input signal that can the script amplitude of fluctuation is less just, modulation also is enlarged into the signal of the change in voltage that microprocessor that its rear end connects is easier to handle.

Fig. 9 is the schematic diagram of control unit among the present invention, is made of microcontroller 41, electric capacity 42, sounding component 44, at least one group of resistance R 13 and button 48.Power pin 50 among the figure, control end points 56 and end points 58 are connected to control end points 144,146 and the end points 150 of Fig. 5 respectively, and 52,54 of end points of control are connected to the control end points 26 of Fig. 6 and the control end points 35 of Fig. 7 respectively.

Can find that from Fig. 5 signal of communication also can pass to the power pin 50 of Fig. 9, the i.e. power supply of microcontroller 41 via resistance R 10 wherein.Because the power supply of microcontroller 41 is steady more good more, therefore add electric capacity 42, the resistance R 10 among this electric capacity 42 and Fig. 5 just in time constitutes low pass filter, can filter the noise on the power supply, also can filter and pass the signal of communication of coming in, make on its power pin that is not apparent in microcontroller 41 50.

Resistance R 13 and button 48 constitute one group of button circuit, and when button 48 is not pressed, open a way in the two ends of button 48, and the voltage of the P1 pin of microcontroller 41 equals the high voltage of power pin 50; When button 48 was pressed, the two ends of button 48 were short circuits, and the voltage of the P1 pin of microcontroller 41 is 0.Therefore, just can detect the state of button 48 by microcontroller 41, the user can utilize button 48 to assign instruction and give microcontroller 41.

Sounding component 44 can just change along with the voltage of P2 pin and sound, when sounding component 44 time at sounding, as wish that its volume is bigger, then must provide bigger electric current by the P2 pin, therefore, can be by the shorted on both ends of control end points 56, so that bigger electric current can offer sounding component 44 sounding through the P2 pin by resistance R 11 with transistor among Fig. 5 126.

Microcontroller 44 can lead to control end points 52 sends the signal generating circuit of communication data to Fig. 6, also can take in by control end points 35 by the received signal of handling well in the signal receiving circuit of control end points 54 with Fig. 7 and carry out interpretation in the microcontroller 44.Comparator 31 in Fig. 7 signal receiving circuit can directly be arranged in this microcontroller 44, but because general utility functions are less, only possess in the microcontroller of simple output/input function and do not contain comparator, so when telephone exchange calling set use of the present utility model contains the microcontroller of comparator, just do not need comparator in the signal receiving circuit, and when the microcontroller of the utility model use does not contain comparator, then as shown in Figure 7, comparator is external in the signal receiving circuit, can reaches the former effect equally.

In sum, the utility model provides a kind of telephone exchange calling set, it utilizes switch module and resistance, reach power consumption hardly at ordinary times, the also extremely low purpose of power consumption during action, therefore, can not need external power supply or battery, the electric power that only utilizes telephone wire itself to be provided can be finished the work that telephone exchange is called out; The utility model utilizes switch module and resistance to change the online voltage of phone, in order to transmit signal.Moreover the utility model utilizes comparator, resistance and electric capacity, input signal is amplified and is tuned as more tractable signal, for the microcontroller interpretation, where necessary, also can utilize switch module and resistance, provides bigger electric current to come supplying to circuit work.

The above is preferred embodiment of the present utility model only, is not to be used for limiting the scope that the utility model is implemented.Event is all according to impartial for it variation of described feature of the utility model protection range and spirit institute or modification, all belong in the scope of patent protection of the present utility model, and protection range of the present utility model should partly be as the criterion with claim.

Claims

1. telephone exchange calling set is characterized in that: comprising:

2. telephone exchange calling set according to claim 1 is characterized in that: this signal receiving circuit comprises a comparator and a low pass filter.

3. telephone exchange calling set according to claim 2, it is characterized in that: this low pass filter is made up of resistance and an electric capacity, it is with the HFS filtering in the telecommunications signal, and the low frequency part of telecommunications signal is sent to the negative terminal/anode of this comparator, former telecommunications signal then is sent to the anode/negative terminal of this comparator.

4. telephone exchange calling set according to claim 1 is characterized in that: this signal generating circuit comprises a switch and a resistance.

5. telephone exchange calling set according to claim 1 is characterized in that: this control unit comprises a microcontroller, an electric capacity, a sounding component, at least one resistance and a guidance panel, and this guidance panel is provided with at least one button.

6. telephone exchange calling set according to claim 6 is characterized in that: this microcontroller can detect the state of this button, and the user can assign instruction by this button and give this microcontroller.

7. telephone exchange calling set according to claim 6 is characterized in that: this sounding component can be when having the telecommunications signal to import this telephone line, sounded by the variation of voltage and notify the user.

8. telephone exchange calling set according to claim 1 is characterized in that: this input signal is to have more tractable change in voltage after this telecommunications signal changing amplifies.

9. telephone exchange calling set according to claim 1, it is characterized in that: when this phone does not connect time-out, this control unit is an off-position, to avoid unnecessary power consumption and load, connect time-out and work as this phone, this control unit is powered, and can make corresponding action according to this button, by this signal receiving circuit and this signal generating circuit signal is handled.

10. telephone exchange calling set according to claim 6 is characterized in that: comprise a comparator in this microcontroller.