CN2225735Y

CN2225735Y - Telephone set with full locking type locking "0"

Info

Publication number: CN2225735Y
Application number: CN 94237787
Authority: CN
Inventors: 郑曙明
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-12
Filing date: 1994-07-12
Publication date: 1996-04-24
Anticipated expiration: 2004-07-12

Abstract

The utility model relates to a telephone set with a full locking type '0' locking circuit. A '0' locking circuit of the utility model is composed of a control circuit, a keyboard switch circuit and an on-hook and power-off circuit. When a '0' locking switch is switched on, all keys on an input keyboard are effective. When the '0' locking switch is switched off and a first number is dialed on the keyboard, only one of nine numeral keys from 1 to 9 can be dialed out, and thus the utility model improves the reliability on locking and controlling distance number dialing for multifunction telephone sets. The utility model has the advantages of simple structure, convenient maintenance and low cost, and the '0' locking switch does not consume electric energy after the telephone set hangs up.

Description

The telephone set that has full locking type lock " 0 " circuit

The utility model relates to a kind of telephone set that has full locking type lock " 0 " circuit, belongs to the pulse technique field in the basic electronic circuit.

The direct distance dialing user is when making a phone call, because of first of toll number is " 0 ", dial toll telephone and just must dial " 0 " earlier, in order to save telephone charges, the user is had no right in control, does not allow them make a long-distance call, and allows them make local telephone with same telephone set, like this, just be added with lock control devices on some telephone set.After the long-distance user of having the right opened lock control devices, available this telephone set was made a long-distance call or local telephone, and when he pins after the lock control devices, and other is had no right the user and then can only make local telephone with same telephone set.

At present used locking and controlling device for long distance telephone has several lock control modes, wherein the most frequently used is exactly first " 0 " number of pinning telephone number.Illustrate by pinning and not pinning two kinds of situations of function of making a long-distance call: (1) pins the function of making a long-distance call: promptly under the situation of lock " 0 ", when dialing the number, when if the first item sign indicating number is " 0 ", the just not number of sending out of telephone set, it is invalid to make by " 0 " key, and for the first time all effective by other key during button, and behind first time button, the phone inner control circuit is removed lock " 0 ", make since the second time button all become effective by any key that comprises " 0 " key again.Like this, be not positioned at primary " 0 " as containing in the telephone number, can have sent yet.(2) do not pin the function of making a long-distance call, promptly under the situation of lock " 0 ", the phone inner control circuit makes " 0 " key continuously effective, that is to say, also can directly transfer to for the telephone number of " 0 " number key for first, and the user can make a long-distance call.

But there is weak point in this lock " 0 " circuit engineering, is exactly that lock " 0 " is not strict, sends even first key is just forbidden dialing when pressing " 0 ", still might get long-distance.For saying clearly this problem, please refer to the telephone principle figure of " 0 " existing with lock circuit shown in Figure 1.

As Fig. 1, the telephone set of existing " 0 " with lock circuit is imported polarity protection and work change-over circuit 1 by telephone wire input terminal A1 and A2; ringing circuit 2 is sent out number switching tube 3 and 4, dialing integrated circuit 5; input keyboard 6, mobile phone communication circuit 7, the double-tone number of taking place frequently triode 8; lock " 0 " bistable circuit 9, lock " 0 " switch 10, " 0 " number key 11; lock " 0 " triode 12; NAND gate 13,

resistance

14 and 16,

diode

15 and 17 and other Resistor-Capacitor Unit form.When this circuit was in open position at lock " 0 " switch 10, the aforementioned just user of having the right pinned the long-distance function of telephone set, when other people can not be made a long-distance call; And when lock " 0 " switch 10 was in closed position, the user that has the right did not just pin the long-distance function of telephone set, when can make a long-distance call.

When this circuit is in open position at lock " 0 " switch 10, it is high voltage that the voltage that is come by the current supply circuit of dialing integrated circuit 5 makes the input b2 of lock " 0 " bistable circuit 9 by resistance 14, thereby the output Q end of lock " 0 " bistable circuit 9 ends lock " 0 " triode 12 for low-voltage.When off-hook is called in this case, as by first key be " 0 " number key 11, because of lock " 0 " triode 12 not conductings, so it is invalid to press " 0 " key, and it is all effective to import other key.1-9 of key keys according to number for example, or when " redialing " key of etc.ing, the integrated circuit 5 that dials begins to export 5 dialing signals, the noise elimination pin M output LOW voltage of the integrated circuit 5 that dials simultaneously, high voltage on the input b2 of lock " 0 " bistable circuit 9 is released by diode 15, become low-voltage.At this moment, lock " 0 " bistable circuit 9 overturns immediately, and Q end output HIGH voltage makes lock " 0 " triode 12 saturation conductions.During later on again by " 0 " number key 11, input effectively promptly can not sent at telephone number primary " 0 ".When on-hook, sending out number triode 4 collector voltages raises, power supply circuits by dialing integrated circuit 5 can not be released by diode 17 by the electric current of resistance 16, make NAND gate 13 be input as high voltage, so NAND gate 13 output ground levels to another input b1 of lock " 0 " bistable circuit 9, make lock " 0 " bistable circuit 9 be turned into output Q end once more and are earth potential.At this moment lock " 0 " triode 12 ends once more, promptly makes a phone call and when dialling again, lock " 0 " control is effective to off-hook once more after the on-hook.When pulse dialing, because of the input b2 that locks " 0 " bistable circuit 9 is controlled by the low level of the noise elimination pin M output of dialing integrated circuit 5 always, so whether send out number switching tube 4 turn-offs when sending out number, do not influence the operating state of lock " 0 " bistable circuit 9, its output Q end is a high level always, make lock " 0 " triode 12 saturation conductions, " 0 " number key 11 continuously effectives (after first key input of keyboard).

When lock " 0 " switch 10 closes, release via lock " 0 " switch 10 by the electric current that resistance 14 is sent here, make the input b2 of lock " 0 " bistable circuit 9 be low level always, at this moment, the output Q end of lock " 0 " bistable circuit 9 also is always high voltage, and lock " 0 " triode 12 is saturation conduction always.In other words, as long as lock " 0 " switch 10 closes, input " 0 " key 11 is always effective.

By the above-mentioned course of work as can be known, this circuit is to pin the toll dialing function by forbidding sending button for the first time for the telephone number of " 0 ", and after the user pressed first key, later " 0 " number still can be sent.If the user by first key be not the digital number key, but other key that does not influence subsequently to be dialed the number, for example " redial " key, then concerning lock " 0 " circuit, owing to pressed first key of non-" 0 ", any key subsequently all can allow it send, if the toll number that telephone number so subsequently " 0 " number is taken the lead also can send, so just have no right the user and can make a long-distance call like this.

Again for example, telephone set mostly has the storing phone number function now.Foregoing circuit is under the situation of utilizing the storage key dialing, when pressing a certain storage key, also be equivalent to by having crossed first key, ensuing number storing just can all send, if storage is a toll number, though its first is " 0 ", also can't lock, this long-distance number of number taking the lead with " 0 " just has been issued.

This lock " 0 " circuit also has other shortcoming, as when lock " 0 " switch 10 closes, will release by resistance 14 from the next electric current of power supply circuits of dialing integrated circuit 5.Like this, when on-hook, can influence the work of dialing integrated circuit 5, its number storing is lost, and the operating state of dialing integrated circuit 5 is also uncertain, can cause phone work undesired behind the off-hook.The phone that has is the generation that prevents this situation, also needs to connect powered battery in addition, causes the inconvenience of safeguarding and using.

The purpose of this utility model is to overcome weak point of the prior art and a kind of telephone set that has full locking type lock " 0 " circuit is provided, when it disconnects at lock " 0 " switch, can lock repertoire key and " 0 " number key except that numerical key 1-9, thereby make telephone set realize lock " 0 " control effectively.

The purpose of this utility model can reach by following measure:

The utility model is by telephone wire input terminal A1 and A2; input polarity protection and work change-over circuit 1; ringing circuit 2; send out number switching tube 3 and 4; model is the dialing integrated circuit 5 of WP 1444, input keyboard 6, mobile phone communication circuit 7; the double-tone number of taking place frequently triode 8, and control circuit, keyboard switch circuit and on-hook power-down circuit are formed.Wherein, control circuit is formed by locking " 0 " bistable circuit 9 and resistance 14 and diode 15, it utilizes the potential change of noise elimination pin M in dialing procedure of dialing integrated circuit 5 of the prior art, and lock " 0 " switch 10 when disconnecting and closing to the current potential influence just of the output Q end and the Q end of lock " 0 " bistable circuit 9, the break-make of removing the supervisory keyboard switching circuit.Keyboard switch circuit is made up of several switch triodes and resistance, conducting or disconnection between these switch triodes just decide keyboard according to the current potential of two output Q of lock " 0 " bistable circuit 9 and Q row or column and the corresponding foot of dialing integrated circuit 5 are locked " 0 " circuit function to realize full locking type.The on-hook power-down circuit is by switch triode 22, lock " 0 " switch 10, diode 25 and 26, hand-free circuit 27, work change-over circuit 28 between mobile phone communication and the hand-free call and some resistance are formed, it makes this band full locking type lock the telephone set of " 0 " circuit after on-hook, no matter lock " 0 " switch opens or close, lock " 0 " circuit part can consumed power.

The drawing explanation of accompanying drawing:

Fig. 1 is the telephone principle figure of existing " 0 " with lock circuit.

Fig. 2 is the circuit diagram of the utility model embodiment.

Fig. 3 is the circuit diagram of lock " 0 " bistable circuit 9 that adopts among the utility model embodiment.

Now in conjunction with the accompanying drawings the utility model embodiment is described further:

The utility model embodiment is by telephone wire input terminal A1 and A2; input polarity protection and work change-over circuit 1; ringing circuit 2; send out number switching tube 3 and 4; dialing integrated circuit 5, input keyboard 6, mobile phone communication circuit 7; the double-tone number of taking place frequently triode 8, and these three circuit of control circuit, keyboard switch circuit and on-hook power-down circuit are formed.Wherein, (Q) end of the lock of control circuit " 0 " bistable circuit (9) connects the base stage of the switch triode (20) in the keyboard switch circuit by resistance (31), (Q) of this lock " 0 " bistable circuit end is connected to the switch triode (18) in the keyboard switch circuit and the base stage of (19) by resistance (29) and (30) respectively, and (b2) of this lock " 0 " bistable circuit (9) holds the collector electrode of the switch triode (22) in the connection on-hook power-down circuit.Control circuit is by lock " 0 " bistable circuit 9, resistance 14, diode 15 is formed, the positive pole of diode 15 meets the input b2 of the collector electrode and lock " 0 " bistable circuit 9 of switch triode 22, the negative pole of diode 15 meets the noise elimination pin M of dialing integrated circuit 5, and resistance 14 is connected between the supply power voltage pin P of the input b2 of lock " 0 " bistable circuit 9 and the integrated circuit 5 that dials.Keyboard switch circuit is by switch triode 18,19 and 20, resistance 29,30 and 31 is formed, switch triode 18 and 19 base stage are received the output Q end of lock " 0 " bistable circuit 9 respectively together by resistance 29 and 30, switch triode 18 and 19 collector electrode are received the c4 and the c5 end of dialing integrated circuit 5 respectively, switch triode 18 and 19 emitter-base bandgap grading are received the n4 of input keyboard 6 and the full row contact of n5 respectively, or certain several contact of required control in n4 and the n5 row; The base stage of switch triode 20 connects the Q end of lock " 0 " bistable circuit 9 by resistance 31, and its emitter-base bandgap grading connects the complete capable contact of the m4 of input keyboard 6, or m4 capable in certain several contact of required control.Collector electrode connects the R4 end of dialing integrated circuit 5.The on-hook power-down circuit is by switch triode 22, lock " 0 " switch 10, diode 25 and 26 and resistance 23 and 24, hand-free circuit 27, work change-over circuit 28 between mobile phone communication and the hand-free call is formed, the collector electrode of switch triode 22 connects the input b2 of lock " 0 " bistable circuit 9, its emitter grounding; Resistance 23 is connected between the base stage and emitter-base bandgap grading of switch triode 22, the base stage of one termination switch triode 22 of resistance 24, the lower end of another termination lock " 0 " switch 10, last terminating diode 25 of lock " 0 " switch 10 and 26 negative pole, the positive pole of diode 25 is taken over a loop that supplies of machine speaking circuit 7, the positive pole of diode 26 connects the current supply circuit of hand-free circuit 27, the output of work change-over circuit 28 is connected between mobile phone communication circuit 7 and the hand-free circuit 27, the collector electrode of the input sending and receiving switching tube 3 of work change-over circuit 28.

In the foregoing circuit, mobile phone communication is meant mentions the mode that could converse with receiver, and hand-free call is meant need not mention receiver, utilizes the mode of the loudspeaker conversation in the phone.

The operation principle of the utility model embodiment: as Fig. 2, switch triode 18 and 19 is as row keyboard switch triode, be used for controlling the switch of each key in row keyboard n4 and n5 two row, or only with the n4/n5 row in certain several contact of required control when joining, be used for controlling the switch of these several keys, in the dialing integrated circuit that the n6 row are arranged, also need increase the switch that an identical triode is done keyboard n6 row.Switch triode 20 is the positive-negative-positive triode, as line unit dish switch triode, be used for controlling line unit dish m4 capable in the switch of each key, or only with m4 capable in certain several contact of required control when joining, be used for controlling the switch of these several keys, in the dialing integrated circuit that m5 is capable even m6 is capable is arranged, also need increase the switch that even two identical triodes are done m5 even m6 line unit dish.At the same time control make 18,19 and 20 3 pipes of switch triode all by the time, only remain n1, n2 on the input keyboard 6, n3 row and m1, m2, m3 is capable effective because of uncontrolled 1-9 these 9 numerical keys that make, and other all functions key and " 0 " key are complete controlled and be turned off.At this moment, the phone user can only select one to carry out the input of first number in these 9 keys.And after this number input, the noise elimination pin M output low level of dialing integrated circuit 5, the b2 input terminal voltage that to lock " 0 " bistable circuit 9 pulls down, make lock " 0 " bistable circuit 9 state turnovers, become Q end output high level, make switch triode 18 and 19 saturation conductions, with the row output c4 and the c5 connection of keyboard n4 and n5 two row and dialing integrated circuit 5; And the Q end output low level of locking " 0 " bistable circuit 9 makes switch triode 20 saturation conductions, and the capable line output end R4 with dialing integrated circuit 5 of keyboard m4 is connected.It is all effective when at this moment, all keys are imported again on the keyboard 6.

This circuit is after lock " 0 " switch 10 closes, if in the mobile phone communication operating state, then the electric current that is come by mobile phone communication circuit 7 current supply circuits flows to lock " 0 " switch 10 through forward conduction diode 25; As when the hand-free call operating state, then the electric current that is come by hand-free circuit 27 current supply circuits flows to lock " 0 " switches 10 through forward conduction diode 26; And in the phone that has only mobile phone communication circuit or mobile phone, the shared same power supply of hands-free two parts, these two diodes 25 and 26 can.Behind electric current process lock " 0 " switch 10 that current supply circuit comes, resistance 23 and 24 makes switch triode 22 saturation conductions, the input b2 current potential that to lock " 0 " bistable circuit 9 drags down, make lock " 0 " bistable circuit 9 state turnovers, its Q end output is high level always, and the output of Q end is low level always.At this moment to dial the situation behind the number the same with aforementioned for circuit operation, just do not repeated at this.

In sum, when the utility model embodiment closed at lock " 0 " switch 10, all keys were all effective on the input keyboard 6; And when lock " 0 " switch 10 is opened, when dialling first number on the input keyboard 6, only can transfer to any key in 1-9 these 9 numerical keys.In other words, this circuit has been realized full locking type lock " 0 " function on multi-feature telephone, makes this phone function realize lock control to toll dialing effectively.

Used lock " 0 " bistable circuit 9 of the utility model embodiment is formed by connecting by two dual input NAND gate, a resistance, an electric capacity, as shown in Figure 3.The model of NAND gate integrated circuit is CD4011.Lock " 0 " bistable circuit 9 has b1 and two inputs of b2, and its function is: when the b2 current potential hanged down, no matter the b1 current potential was high or low, and output all is that the high Q of Q is low; When the b2 current potential was high, no matter the b1 current potential was high again after low or low, and output all is the low Q height of Q; When b1 was high, high again after b2 is low, then the high Q of Q was low.So lock " 0 " bistable circuit 9 also can be done by other circuit such as counters, as long as have b1 and two outputs of b2, and has function same as described above and gets final product.

In the foregoing circuit, dialing integrated circuit 5 is because of the model difference, and the noise elimination output pin of some dialing integrated circuit is the high level noise elimination, and its noise elimination pin symbol is M, at this moment need add the b2 input that an inverter is connected to lock " 0 " bistable circuit 9 after with its paraphase again.

In addition, this telephone set network is when on-hook, the speaking circuit power failure, at this moment whether no matter lock " 0 " switch 10 closes, switch triode 22 all ends because of no base stage bias current, makes dialing integrated circuit 5 current supply circuits can not release via the electric current that resistance 14 causes the b2 input of lock " 0 " bistable circuit 9.Like this, no matter lock " 0 " switch 10 and open or close, the lock of telephone set " 0 " circuit part consumed power not makes this telephone set without external connection battery after the on-hook, just can preserve the telephone number of being stored reliably.

Compared with the prior art, the utlity model has following advantages:

1, because lock " 0 " insecure shortcoming in the prior art has been carried out specific aim Improvement, make the utility model realize full locking type lock " 0 " at multi-feature telephone Function has improved the reliability of long-distance call lock control greatly.

2, simple in structure, easy to maintenance; The lock of telephone set " 0 " circuit part after the on-hook Divide and do not consume electric energy.

3, with low cost, be convenient to promote the use of.The components and parts cost of the lock control circuit part of this telephone set that has full locking type lock " 0 " circuit only needs about 2 yuan.

Claims

1; a kind of telephone set that has full locking type lock " 0 " circuit; by telephone wire input terminal (A1) and (A2); input polarity protection and work change-over circuit (1); ringing circuit (2); send out number switching tube (3) and (4); dialing integrated circuit (5); input keyboard (6); mobile phone communication circuit (7); the double-tone number of taking place frequently triode (8) is formed; it is characterized in that: it also has control circuit; keyboard switch circuit and on-hook power-down circuit; (Q) end of the lock of control circuit " 0 " bistable circuit (9) connects the base stage of the switch triode (20) in the keyboard switch circuit by resistance (31); (Q) of this lock " 0 " bistable circuit end is connected to the switch triode (18) in the keyboard switch circuit and the base stage of (19) by resistance (29) and (30) respectively, and (b2) of this lock " 0 " bistable circuit (9) holds the collector electrode of the switch triode (22) in the connection on-hook power-down circuit.

2, the telephone set that has full locking type lock " 0 " circuit according to claim 1, it is characterized in that: described control circuit is by lock " 0 " bistable circuit (9), resistance (14), diode (15) is formed, wherein, the positive pole of diode (15) connects the input (b2) of lock " 0 " bistable circuit 9, the negative pole of diode (15) connects the noise elimination pin (M) of dialing integrated circuit (5), and resistance (14) is connected between the supply power voltage pin P of the input (b2) of lock " 0 " bistable circuit (9) and the integrated circuit (5) that dials.

3, the telephone set that has full locking type lock " 0 " circuit according to claim 1, it is characterized in that: described keyboard switch circuit is by switch triode (18), (19) and (20), resistance (29), (30) and (31) form, wherein, the base stage of switch triode (18) and (19) is received output (Q) end of lock " 0 " bistable circuit (9) respectively together by resistance (29) and (30), the collector electrode of switch triode (18) and (19) is received (c4) of dialing integrated circuit (5) respectively and (c5) is held, the emitter-base bandgap grading of switch triode (18) and (19) is received (n4) of input keyboard (6) and (n5) whole contacts of row respectively, or (n4) and (n5) certain several contact of required control in the row; The base stage of switch triode (20) connects (Q) end of lock " 0 " bistable circuit (9) by resistance (31), its emitter-base bandgap grading connects whole contacts of (m4) row of input keyboard (6), or m4 capable in certain several contact of required control, collector electrode connects (R4) end of dialing integrated circuit (5).

4, the telephone set that has full locking type lock " 0 " circuit according to claim 1, it is characterized in that: described on-hook power-down circuit is by switch triode (22), lock " 0 " switch (10), diode (25) and (26) and resistance (23) and (24), hand-free circuit (27), work change-over circuit (28) between mobile phone communication and the hand-free call is formed, wherein, the collector electrode of switch triode (22) connects the input (b2) of lock " 0 " bistable circuit (9), its emitter grounding; Resistance (23) is connected between the base stage and emitter-base bandgap grading of switch triode (22), the base stage of one termination switch triode (22) of resistance (24), the lower end of another termination lock " 0 " switch (10), the last terminating diode (25) of lock " 0 " switch (10) and the negative pole of (26), the positive pole catcher machine speaking circuit (7) of diode (25), the positive pole of diode (26) connects hand-free circuit (27), the output of work change-over circuit (28) is connected between mobile phone communication circuit (7) and the hand-free circuit (27), the collector electrode of the input sending and receiving switching tube (3) of work change-over circuit (28).