CN215954485U

CN215954485U - One-key dialing alarm

Info

Publication number: CN215954485U
Application number: CN202122061058.5U
Authority: CN
Inventors: 李树强; 巨睦; 杨帆; 于加业; 聂海波
Original assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Current assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-03-04
Anticipated expiration: 2031-08-30

Abstract

The utility model discloses a one-key dialing alarm. The one-key dialing alarm of the present invention comprises: the system comprises a singlechip, a polarity conversion circuit, a pick-up and hang-up control circuit, a power supply circuit, a state detection circuit, a dialing interface circuit, a dual-tone multi-frequency signal generation circuit and an alarm button; the utility model starts from the reality, adopts the network resource of the existing telephone line and combines the control of the singlechip to realize the function of one-key dialing alarm, can be used by connecting the telephone line, has wide application range and is not limited by distance; if an emergency occurs, one-key dialing can be realized in the shortest time, so that rapid alarm is realized, and the emergency handling efficiency of emergency events is improved; the alarm has the advantages of low cost, simple structure, reliable work, strong practicability, fast information transmission, long transmission distance, convenient use and the like, has better practical value, and overcomes the defects of the existing alarm.

Description

One-key dialing alarm

Technical Field

The utility model relates to a device for transmitting signals based on a telephone line, in particular to a one-key dialing alarm.

Background

With the continuous progress and development of communication technology, the functions of the telephone are more and more, and the telephone is more and more convenient. However, when an emergency or an emergency occurs, the user needs to contact with the outside at the first time to send out a help seeking signal, if the user makes a call in a common mode, the user inevitably delays time and affects rescue, and if the user suddenly forgets the contact way of a help seeker in the emergency, the personal safety is directly affected.

Compared with the existing alarms in the market, some of the alarms have the conditions of slow response, delayed alarm or limitation of propagation distance, thus directly influencing the alarm efficiency and the personal safety of people.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides a one-key dialing alarm.

The one-key dialing alarm of the present invention comprises: the system comprises a singlechip, a polarity conversion circuit, a pick-up and hang-up control circuit, a power supply circuit, a state detection circuit, a dialing interface circuit, a dual-tone multi-frequency signal generation circuit and an alarm button; wherein, the telephone line is connected to the polarity switching circuit; the polarity conversion circuit is connected in parallel to the on-hook and off-hook control circuit and the power supply circuit; the hook control circuit is connected to the dialing interface circuit, the hook control circuit is conducted with the dialing interface circuit in the off-hook state, and the hook control circuit is disconnected with the dialing interface circuit in the on-hook state; a signal control port of the hook-and-loop control circuit is connected to the single chip microcomputer; the dual-tone multi-frequency signal generating circuit is connected to the dialing interface circuit; the singlechip is connected to the dual-tone multi-frequency signal generating circuit; the single chip microcomputer is also connected to an alarm button and a state detection circuit; the telephone line is also connected to the state detection circuit; the power circuit is connected to the single chip microcomputer, the state detection circuit and the dual-tone multi-frequency signal generation circuit.

The power circuit obtains power supply after polarity conversion directly from the telephone line, and provides working voltage for the singlechip, the state detection circuit and the dual-tone multi-frequency signal generating circuit; determining the polarity of the telephone line through a polarity conversion circuit; before alarming, namely in the state that an alarm button is not pressed, the system is in an on-hook state, and the on-hook control circuit is disconnected with the dialing interface circuit; when the alarm button is pressed, the single chip microcomputer immediately sends a high-level trigger signal to a signal control port of the on-hook control circuit when detecting that the alarm button is pressed, at the moment, the on-hook control circuit is in an off-hook state and is conducted with the dialing interface circuit, and the single chip microcomputer sends an alarm telephone number set by a user to the dual-tone multi-frequency signal generating circuit; the dual-tone multi-frequency signal generating circuit converts the alarm telephone number of the digital quantity into an analog quantity to form a corresponding dual-tone multi-frequency signal which is transmitted to the dialing interface circuit; the dialing interface circuit transmits the dual-tone multi-frequency signal to a telephone line through the conducted on-hook and off-hook control circuit and the polarity conversion circuit; after the dual-tone multi-frequency signal is sent out, two situations exist: dialing or holding; the state detection circuit detects the dialing or the busy line, if the dialing is detected, the singlechip sends a low-level trigger signal to a signal control port of the on-hook and off-hook control circuit at set time, and the one-key dialing alarm is automatically hung up; if the busy is detected, the dialing is carried out again after the set time. After the alarm call is successfully dialed, the mobile phone is in an on-hook state.

The on-hook and off-hook control circuit comprises: a high-voltage triode, a driving triode and first to fourth resistors; the emitter of the high-voltage triode is used as a voltage input port of the on-hook and off-hook control circuit and is connected with an output port of the polarity conversion circuit; one end of the first resistor is connected to the emitter of the high-voltage triode, the other end of the first resistor is connected to the base of the high-voltage triode, and the collector of the high-voltage triode is used as a line voltage output port of the hook-and-loop control circuit and is connected to a positive line terminal port of a telephone voice chip of the dialing interface circuit; the base electrode of the high-voltage triode is connected to one end of a second resistor, and the other end of the second resistor is connected to the collector electrode of the driving triode; the emitting electrode of the driving triode is grounded; the base electrode of the driving triode is connected to one end of a third resistor, and the other end of the third resistor is connected to a second input/output end of the single chip microcomputer as a signal control port of the hook and loop control circuit. When the singlechip outputs a high-level trigger signal to the base of the drive triode, the drive triode is conducted, so that the base of the high-voltage triode is pulled down, the high-voltage triode is conducted, the impedance of a circuit is changed, and the on-hook control circuit is conducted with the dialing interface circuit, namely in an off-hook state; on the contrary, when the single chip outputs a low-level trigger signal to the base electrode of the driving triode, the driving triode is cut off, and the high-voltage triode is cut off accordingly, so that the on-hook control circuit is disconnected from the dialing interface circuit, namely, the on-hook state is realized. Pressing an alarm button to be in an off-hook state; and the alarm is successfully sent and the system is in an on-hook state after being hung up.

The power supply circuit includes: a constant current source and a linear voltage stabilizing circuit; the constant current source comprises a first PNP triode, a second PNP triode, a fifth resistor, a seventh resistor and a capacitor; the linear voltage stabilizing circuit comprises a voltage stabilizing chip, a voltage stabilizing diode and first to third capacitors; an emitting electrode of the first PNP triode and one end of the fifth resistor are connected with the output end of the polarity conversion circuit; the collector of the first PNP triode is grounded through a sixth resistor; the base electrode of the first PNP triode is connected to the emitting electrode of the second PNP triode; the base electrode of the second PNP triode is grounded through a sixth resistor; the collector of the second PNP triode is connected to one end of the seventh resistor; the other end of the seventh resistor is connected to the input end of the voltage stabilizing chip; the voltage stabilizing diode, the first capacitor and the second capacitor are connected between the input end of the voltage stabilizing chip and the ground in parallel; the output end of the voltage stabilizing chip outputs a positive voltage source, and the output end of the voltage stabilizing chip is grounded through a third capacitor. The power supply of the power supply circuit is directly obtained from the telephone line through polarity conversion by matching the constant current source with the linear voltage stabilizing circuit, so that each module can be powered.

The state detection circuit includes: an amplifying circuit and a filter; the amplifying circuit comprises fourth to sixth capacitors, eighth to tenth resistors and an operational amplifier; the filter comprises eleventh to thirteenth resistors and a seventh capacitor; the fifth capacitor is connected with the ninth resistor in series and is connected to the negative input end of the operational amplifier; the sixth capacitor is connected with the tenth resistor in series and is connected to the positive input end of the operational amplifier; the positive power supply end of the operational amplifier is connected with the positive voltage source, the positive power supply end is grounded through the fourth capacitor, and the negative power supply end is grounded; the output end of the operational amplifier is connected to the negative input end through an eighth resistor; the output end of the operational amplifier is connected to one end of an eleventh resistor, and the other end of the eleventh resistor is connected to the analog quantity acquisition end of the single chip microcomputer; the analog quantity acquisition end of the singlechip is grounded through a seventh capacitor; the output end of the operational amplifier is respectively connected to one ends of a twelfth resistor and a thirteenth resistor, the other end of the twelfth resistor is connected with a positive voltage source, and the other end of the thirteenth resistor is grounded. The state detection circuit judges whether the signal is a busy tone signal or a ring-back tone signal, the frequencies of the busy tone signal and the ring-back tone signal are the same, but the signal duration of the ring-back tone and the busy tone is different, so that the two signals are distinguished by using the difference of the signal duration, and the busy tone signal or the ring-back tone signal is judged by detecting the duration of a continuous waveform; the state detection circuit firstly amplifies the signal through the amplifying circuit, then filters the signal, finally outputs the signal to the single chip microcomputer for sampling, and processes the acquired data to judge whether the signal is a busy tone signal or a ring-back tone signal.

The dial interface circuit includes: the device comprises a telephone voice chip, a gain adjusting circuit, a mute input circuit, a receiving amplifying circuit and a direct current resistance adjusting circuit; the gain adjusting circuit is connected to a gain adjusting port of the telephone voice chip, the mute input circuit is connected to a mute input port of the telephone voice chip, the receiving and amplifying circuit is connected to a receiving and amplifying input port of the telephone voice chip, and the direct current resistance adjusting circuit is connected to a direct current resistance adjusting port of the telephone voice chip.

The dual tone multi-frequency signal generating circuit includes: a dual-tone multi-frequency signal generating chip, a crystal oscillator and a twenty-fourth to twelfth capacitors; the data input end of the dual-tone multi-frequency signal generating chip is connected to the first input and output end of the single chip microcomputer, the clock input end of the dual-tone multi-frequency signal generating chip is connected to the third input and output end of the single chip microcomputer, and the enabling end of the dual-tone multi-frequency signal generating chip is connected to the fourth input and output end of the single chip microcomputer; the negative power end of the dual-tone multi-frequency signal generating chip is grounded, the positive power end is connected with a positive voltage source, and the positive voltage source is grounded through a twenty-four capacitor; the input end and the output end of the crystal oscillator of the dual-tone multi-frequency signal generating chip are respectively connected with the two ends of the crystal oscillator; two ends of the crystal oscillator are grounded through a twenty-second capacitor and a twenty-third capacitor respectively, and a signal output end of the dual-tone multi-frequency signal generating chip is coupled to a dual-tone multi-frequency signal input port of a telephone voice chip of the dialing interface circuit through a thirteenth capacitor. The single chip microcomputer generates a dual-tone multi-frequency signal DTMF by driving a dual-tone multi-frequency signal generation chip, wherein the dual-tone multi-frequency signal is composed of four high-frequency groups and four low-frequency group frequencies, and one high-frequency group and one low-frequency group represent a digit in a combined mode, namely, the waveform of an alarm telephone number to be dialed is generated; the dual-tone multi-frequency signal is coupled to the dialing interface circuit through the thirteenth capacitor via the signal output terminal of the dual-tone multi-frequency signal generating chip.

After the dialing is conducted, the one-key dialing alarm is hung up after 2-10 s; and in the busy state, redialing after 2-5 s.

The utility model has the advantages that:

the utility model starts from the reality, adopts the network resource of the existing telephone line and combines the control of the singlechip to realize the function of one-key dialing alarm, can be used by connecting the telephone line, has wide application range and is not limited by distance; if an emergency occurs, one-key dialing can be realized in the shortest time, so that rapid alarm is realized, and the emergency handling efficiency of emergency events is improved; the alarm has the advantages of low cost, simple structure, reliable work, strong practicability, fast information transmission, long transmission distance, convenient use and the like, has better practical value, and overcomes the defects of the existing alarm.

Drawings

FIG. 1 is a block diagram of the one-touch dial alarm of the present invention;

fig. 2 is a circuit diagram of a hook and hook control circuit of the one-key dialing alarm of the present invention;

FIG. 3 is a circuit diagram of the power circuit of the one-touch dial alarm of the present invention;

FIG. 4 is a circuit diagram of a status detection circuit of the one-touch dial alarm of the present invention;

FIG. 5 is a circuit diagram of the dialing interface circuit of the one-key dialing alarm of the present invention;

fig. 6 is a circuit diagram of a dual tone multi-frequency signal generating circuit of the one-key dialing alarm of the present invention.

Detailed Description

The utility model will be further elucidated by means of specific embodiments in the following with reference to the drawing.

As shown in fig. 1, the one-touch dial alarm of the present embodiment includes: the system comprises a singlechip, a polarity conversion circuit, a pick-up and hang-up control circuit, a power supply circuit, a state detection circuit, a dialing interface circuit, a dual-tone multi-frequency signal generation circuit and an alarm button; the telephone line is connected to the input port of the polarity conversion circuit; the output port of the polarity conversion circuit is connected in parallel to the on-hook and off-hook control circuit and the power supply circuit; the line voltage output port of the hook control circuit is connected to the positive line terminal port of the dialing interface circuit, the hook control circuit is conducted with the dialing interface circuit in an off-hook state, and the hook control circuit is disconnected with the dialing interface circuit in an on-hook state; the dual-tone multi-frequency signal generating circuit is connected to a dual-tone multi-frequency signal input port of the dialing interface circuit; a signal control port of the hook-and-loop control circuit is connected to the single chip microcomputer; the singlechip is connected to the dual-tone multi-frequency signal generating circuit; the single chip microcomputer is also connected to an alarm button and a state detection circuit; the telephone line is also connected to the state detection circuit; the power supply circuit is connected to the single chip microcomputer, the state detection circuit and the dual-tone multi-frequency signal generation circuit and provides working voltage.

The power circuit obtains power supply after polarity conversion directly from the telephone line, and provides working voltage for the singlechip, the state detection circuit and the dual-tone multi-frequency signal generating circuit; determining the polarity of the telephone line through a polarity conversion circuit; before alarming, namely in the state that an alarm button is not pressed, the system is in an on-hook state, and the on-hook control circuit is disconnected with the dialing interface circuit; when the alarm button is pressed, the single chip microcomputer immediately sends a high-level trigger signal to a signal control port of the on-hook control circuit when detecting that the alarm button is pressed, at the moment, the on-hook control circuit is in an off-hook state and is conducted with the dialing interface circuit, and the single chip microcomputer sends an alarm telephone number set by a user to the dual-tone multi-frequency signal generating circuit; the dual-tone multi-frequency signal generating circuit converts the alarm telephone number of the digital quantity into an analog quantity to form a corresponding dual-tone multi-frequency signal which is transmitted to the dialing interface circuit; the dialing interface circuit transmits the dual-tone multi-frequency signal to a telephone line through the conducted on-hook and off-hook control circuit and the polarity conversion circuit; after the dual-tone multi-frequency signal is sent out, two situations exist: dialing or holding; the state detection circuit detects the dialing or the line occupation, after the dialing is detected, the single chip sends a low-level trigger signal to a signal control port of the on-hook and off-hook control circuit within set time, and the single chip is automatically hung up after a one-key dialing alarm is used for 2 s; in the busy state, the user redials after 5 s. After the alarm call is successfully dialed, the mobile phone is in an on-hook state.

As shown in fig. 2, the on-hook control circuit includes: a high-voltage triode Q1, a driving triode Q2 and first to fourth resistors R1 to R4; wherein, the emitter of the high-voltage triode Q1 is connected with the output end of the polarity switching circuit; one end of the first resistor is connected to the emitting electrode of the high-voltage triode, the other end of the first resistor is connected to the base electrode of the high-voltage triode Q1, and the collector electrode of the high-voltage triode Q1 is connected to the dialing interface circuit; the base electrode of the high-voltage triode Q1 is connected to one end of a second resistor, and the other end of the second resistor is connected to the collector electrode of the driving triode Q2; the emitter of the driving transistor Q2 is grounded; the base electrode of the driving triode Q2 is connected to one end of a third resistor, and the other end of the third resistor is connected to a second input/output end IO2 of the single chip microcomputer. When the singlechip outputs a high-level trigger signal to the base of the drive triode, the drive triode is conducted, so that the base of the high-voltage triode is pulled down, the high-voltage triode is conducted, the impedance of a circuit is changed, and the on-hook control circuit is conducted with the dialing interface circuit, namely in an off-hook state; on the contrary, when the single chip outputs a low level signal to the base electrode of the driving triode, the driving triode is cut off, and the high-voltage triode is also cut off, so that the on-hook control circuit is disconnected with the dialing interface circuit, namely, the on-hook state is realized. Pressing an alarm button to be in an off-hook state; and the alarm is successfully sent and the system is in an on-hook state after being hung up.

As shown in fig. 3, the power supply circuit includes: a constant current source and a linear voltage stabilizing circuit; the constant current source comprises a first PNP triode Q3, a second PNP triode Q4, a fifth resistor R5-a seventh resistor R7; the linear voltage stabilizing circuit comprises a voltage stabilizing chip LDO, a voltage stabilizing diode D1 and first to third capacitors C1-C3; an emitter of the first PNP triode Q3 and one end of the fifth resistor are connected with the output end of the polarity conversion circuit; the collector of the first PNP triode Q3 is grounded through the sixth resistor; the base of the first PNP transistor Q3 is connected to the emitter of the second PNP transistor Q4; the base electrode of the second PNP triode Q4 is grounded through a sixth resistor; the collector of the second PNP transistor Q4 is connected to one end of the seventh resistor; the other end of the seventh resistor is connected to the input end of the voltage stabilizing chip; the voltage stabilizing diode D1 and the first and second capacitors are connected in parallel between the input end of the voltage stabilizing chip and the ground; the output end of the voltage stabilizing chip outputs a positive voltage source VCC, and the output end of the positive voltage stabilizing chip is grounded through a third capacitor. The power supply of the power supply circuit is directly obtained from the telephone line through polarity conversion by matching the constant current source with the linear voltage stabilizing circuit, so that each module can be powered.

As shown in fig. 4, the state detection circuit includes: an amplifying circuit and a filter; the amplifying circuit comprises fourth to sixth capacitors C4-C6, eighth to tenth resistors R8-R10 and an operational amplifier OP; the filter comprises eleventh to thirteenth resistors R11 to R13 and a seventh capacitor C7; the fifth capacitor is connected with the ninth resistor in series and is connected to the negative input end of the operational amplifier; the sixth capacitor is connected with the tenth resistor in series and is connected to the positive input end of the operational amplifier; the positive power supply end of the operational amplifier is connected with a positive voltage source VCC of the power supply circuit, the positive power supply end VCC is grounded through a fourth capacitor, and the negative power supply end is grounded; the output end of the operational amplifier is connected to the negative input end through an eighth resistor; the output end of the operational amplifier is connected to one end of an eleventh resistor, and the other end of the eleventh resistor is connected to an analog quantity acquisition end ADC of the singlechip; the analog quantity acquisition end ADC of the single chip microcomputer is grounded through a seventh capacitor; the output end of the operational amplifier is respectively connected to one ends of a twelfth resistor and a thirteenth resistor, the other end of the twelfth resistor is connected with a positive voltage source VCC, and the other end of the thirteenth resistor is grounded.

As shown in fig. 5, the dial interface circuit includes: telephone voice chip DIAL, gain regulating circuit, mute input circuit, receiving amplifying circuit and direct current resistance regulating circuit; the gain adjusting circuit is connected to a gain adjusting port of the telephone voice chip, the mute input circuit is connected to a mute input port of the telephone voice chip, the receiving and amplifying circuit is connected to a receiving and amplifying input port of the telephone voice chip, and the direct current resistance adjusting circuit is connected to a direct current resistance adjusting port of the telephone voice chip. The eighteenth resistor R8, the twentieth resistor R20, the twelfth capacitor C12 and a gain adjusting port of the telephone voice chip form a gain adjusting circuit; the seventeenth resistor, the eleventh capacitor and a mute input port of the telephone voice chip form a mute input circuit; the sixteenth resistor R16, the twenty first to twenty fourth resistors R21 to R24, the twenty sixth resistor R26, the fourteenth, fifteenth and eighteenth capacitors C14, C15 and C18 and the receiving and amplifying input port of the telephone voice chip constitute a receiving and amplifying circuit. The fourteenth resistor R24 is a current-limiting resistor, the twenty-fifth resistor R25 is a direct-current regulating resistor, the nineteenth resistor R19 is a current regulating resistor, the second diode D2 is a voltage stabilizing protection diode, the fifteenth resistor R15 is a voltage dividing resistor, the eighth and ninth capacitors C8 and C9 are filter capacitors at power supply terminals, the tenth, sixteenth and seventeenth capacitors C10, C16 and C17 are decoupling capacitors, and the thirteenth capacitor C13 is a dual-tone multi-frequency input coupling capacitor, so that the dial interface circuit is formed by the circuits.

As shown in fig. 6, the dual tone multi-frequency signal generating circuit includes: a dual-tone multi-frequency signal generating chip DTMFSGC, a crystal oscillator Y1 and a twenty-second to twenty-fourth capacitors C22-C24; the DATA input end DATA of the dual-tone multi-frequency signal generating chip is connected to a first input/output end IO1 of the single chip microcomputer, the clock input end CLK is connected to a third input/output end IO3 of the single chip microcomputer, and the enable end CE is connected to a fourth input/output end IO4 of the single chip microcomputer; the negative power supply end of the dual-tone multi-frequency signal generating chip is grounded, the positive power supply end is connected with a positive voltage source VCC of the power supply circuit, and the positive voltage source is grounded through a twenty-four capacitor; the input end and the output end of the crystal oscillator of the dual-tone multi-frequency signal generating chip are respectively connected with the two ends of the crystal oscillator Y1; two ends of the crystal oscillator Y1 are grounded through a twenty-second capacitor and a twenty-third capacitor respectively. The signal output terminal of the dtmf signal generating chip is coupled to the dtmf signal input port of the telephone voice chip through a thirteenth capacitor C13. The single chip microcomputer generates a dual-tone multi-frequency signal DTMF by driving a dual-tone multi-frequency signal generation chip, wherein the dual-tone multi-frequency signal is composed of four high-frequency groups and four low-frequency group frequencies, and one high-frequency group and one low-frequency group represent a digit in a combined mode, namely, the waveform of an alarm telephone number to be dialed is generated; the dual-tone multi-frequency signal DTMF is coupled to the dialing interface circuit through the thirteenth capacitor through the signal output end of the dual-tone multi-frequency signal generating chip.

Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the utility model, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the utility model and the appended claims. Therefore, the utility model should not be limited to the embodiments disclosed, but the scope of the utility model is defined by the appended claims.

Claims

1. A one-key dialing alarm, comprising: the system comprises a singlechip, a polarity conversion circuit, a pick-up and hang-up control circuit, a power supply circuit, a state detection circuit, a dialing interface circuit, a dual-tone multi-frequency signal generation circuit and an alarm button; wherein, the telephone line is connected to the polarity switching circuit; the polarity conversion circuit is connected in parallel to the on-hook and off-hook control circuit and the power supply circuit; the hook control circuit is connected to the dialing interface circuit, the hook control circuit is conducted with the dialing interface circuit in the off-hook state, and the hook control circuit is disconnected with the dialing interface circuit in the on-hook state; a signal control port of the hook-and-loop control circuit is connected to the single chip microcomputer; the dual-tone multi-frequency signal generating circuit is connected to the dialing interface circuit; the singlechip is connected to the dual-tone multi-frequency signal generating circuit; the single chip microcomputer is also connected to an alarm button and a state detection circuit; the telephone line is also connected to the state detection circuit; the power circuit is connected to the single chip microcomputer, the state detection circuit and the dual-tone multi-frequency signal generation circuit.

2. The one-touch dial alarm of claim 1, wherein said hook and loop control circuit comprises: a high-voltage triode, a driving triode and first to fourth resistors; the emitter of the high-voltage triode is used as a voltage input port of the on-hook and off-hook control circuit and is connected with an output port of the polarity conversion circuit; one end of the first resistor is connected to the emitter of the high-voltage triode, the other end of the first resistor is connected to the base of the high-voltage triode, and the collector of the high-voltage triode is used as a line voltage output port of the hook-and-loop control circuit and is connected to a positive line terminal port of a telephone voice chip of the dialing interface circuit; the base electrode of the high-voltage triode is connected to one end of a second resistor, and the other end of the second resistor is connected to the collector electrode of the driving triode; the emitting electrode of the driving triode is grounded; the base electrode of the driving triode is connected to one end of a third resistor, and the other end of the third resistor is connected to a second input/output end of the single chip microcomputer as a signal control port of the hook and loop control circuit.

3. The one-touch dial alarm of claim 1, wherein said power circuit comprises: a constant current source and a linear voltage stabilizing circuit; the constant current source comprises a first PNP triode, a second PNP triode and fifth to seventh resistors; the linear voltage stabilizing circuit comprises a voltage stabilizing chip, a voltage stabilizing diode and first to third capacitors; an emitting electrode of the first PNP triode and one end of the fifth resistor are connected with the output end of the polarity conversion circuit; the collector of the first PNP triode is grounded through a sixth resistor; the base electrode of the first PNP triode is connected to the emitting electrode of the second PNP triode; the base electrode of the second PNP triode is grounded through a sixth resistor; the collector of the second PNP triode is connected to one end of the seventh resistor; the other end of the seventh resistor is connected to the input end of the voltage stabilizing chip; the voltage stabilizing diode, the first capacitor and the second capacitor are connected between the input end of the voltage stabilizing chip and the ground in parallel; the output end of the voltage stabilizing chip outputs a positive voltage source, and the output end of the voltage stabilizing chip is grounded through a third capacitor.

4. The one-touch dial alarm of claim 1, wherein said status detection circuit comprises: an amplifying circuit and a filter; the amplifying circuit comprises fourth to sixth capacitors, eighth to tenth resistors and an operational amplifier; the filter comprises eleventh to thirteenth resistors and a seventh capacitor; the fifth capacitor is connected with the ninth resistor in series and is connected to the negative input end of the operational amplifier; the sixth capacitor is connected with the tenth resistor in series and is connected to the positive input end of the operational amplifier; the positive power supply end of the operational amplifier is connected with the positive voltage source, the positive power supply end is grounded through the fourth capacitor, and the negative power supply end is grounded; the output end of the operational amplifier is connected to the negative input end through an eighth resistor; the output end of the operational amplifier is connected to one end of an eleventh resistor, and the other end of the eleventh resistor is connected to the analog quantity acquisition end of the single chip microcomputer; the analog quantity acquisition end of the singlechip is grounded through a seventh capacitor; the output end of the operational amplifier is respectively connected to one ends of a twelfth resistor and a thirteenth resistor, the other end of the twelfth resistor is connected with a positive voltage source, and the other end of the thirteenth resistor is grounded.

5. The one-touch dial alarm of claim 1, wherein said dial interface circuit comprises: the device comprises a telephone voice chip, a gain adjusting circuit, a mute input circuit, a receiving amplifying circuit and a direct current resistance adjusting circuit; the gain adjusting circuit is connected to a gain adjusting port of the telephone voice chip, the mute input circuit is connected to a mute input port of the telephone voice chip, the receiving and amplifying circuit is connected to a receiving and amplifying input port of the telephone voice chip, and the direct current resistance adjusting circuit is connected to a direct current resistance adjusting port of the telephone voice chip.

6. The one-touch dial alarm of claim 1, wherein said dual tone multi-frequency signal generating circuit comprises: a dual-tone multi-frequency signal generating chip, a crystal oscillator and a twenty-fourth to twelfth capacitors; the data input end of the dual-tone multi-frequency signal generating chip is connected to the first input and output end of the single chip microcomputer, the clock input end of the dual-tone multi-frequency signal generating chip is connected to the third input and output end of the single chip microcomputer, and the enabling end of the dual-tone multi-frequency signal generating chip is connected to the fourth input and output end of the single chip microcomputer; the negative power end of the dual-tone multi-frequency signal generating chip is grounded, the positive power end is connected with a positive voltage source, and the positive voltage source is grounded through a twenty-four capacitor; the input end and the output end of the crystal oscillator of the dual-tone multi-frequency signal generating chip are respectively connected with the two ends of the crystal oscillator; two ends of the crystal oscillator are grounded through a twenty-second capacitor and a twenty-third capacitor respectively, and a signal output end of the dual-tone multi-frequency signal generating chip is coupled to a dual-tone multi-frequency signal input port of a telephone voice chip of the dialing interface circuit through a thirteenth capacitor.

7. The one-key dialing alarm device according to claim 1, wherein after the alarm telephone is switched on, the one-key dialing alarm device is hung up after 2-10 s; and in the busy state, redialing after 2-5 s.