CN101819707A - Mobile phone burglar alarm and method - Google Patents
Mobile phone burglar alarm and method Download PDFInfo
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- CN101819707A CN101819707A CN201010169580A CN201010169580A CN101819707A CN 101819707 A CN101819707 A CN 101819707A CN 201010169580 A CN201010169580 A CN 201010169580A CN 201010169580 A CN201010169580 A CN 201010169580A CN 101819707 A CN101819707 A CN 101819707A
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Abstract
本发明公开了一种手机防盗报警器及方法，通过以下步骤：接收手机不断发出的射频信号；提高接收到的射频信号的能量；将射频信号转换为模拟信号；将模拟信号放大；将放大后的模拟信号转变为数字信号，并通过与基准电压比较判断是输出高电平还是低电平；根据接收到的高电平或低电平来选择是否驱动报警器做出报警动作。采用本发明可有效地防止手机被盗。
The invention discloses a mobile phone anti-theft alarm and a method. The steps are as follows: receiving radio frequency signals continuously sent by mobile phones; increasing the energy of the received radio frequency signals; converting the radio frequency signals into analog signals; amplifying the analog signals; The analog signal is converted into a digital signal, and it is judged whether to output high level or low level by comparing with the reference voltage; according to the received high level or low level, it is selected whether to drive the alarm to make an alarm action. The invention can effectively prevent the mobile phone from being stolen.
Description
Technical field
The present invention relates to a kind of mobile phone burglar alarm.
Background technology
By on Dec 31st, 2008, have 4,000,000,000 cellphone subscribers nearly in the world, and this numeral is also in growth at full speed.Mobile phone is as a portable portable terminal, and volume is little, the price height, thus also become the target of thief's favor easily, so mobile phone safety always all is the field that everybody pays close attention to.And also good without comparison anti-stealing device for handset on the present market.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of radiofrequency signal of sending by detection of handset to make mobile phone burglar alarm, thereby guarantee the safety of mobile phone.
Technical scheme of the present invention is as follows:
A kind of mobile phone burglar alarm, wherein, comprise the antenna, energy storage device, diode peak envelope detecting device, signal amplifier, signal comparator, hummer control circuit and the hummer that are linked in sequence, also comprise a reference voltage generator, described reference voltage generator produces reference voltage and imports described signal comparator, wherein
Described antenna is used to receive the radiofrequency signal that mobile phone sends;
Described energy storage device is used to improve the energy of the radiofrequency signal that receives;
Described diode peak envelope detecting device is used for converting radiofrequency signal to simulating signal;
Described signal amplifier is used for the simulating signal after the conversion is amplified;
Described signal comparator is used for amplified analog signal is transformed into digital signal, and with the input signal comparer in reference voltage relatively, judge it is output low level or output high level then;
Described hummer control circuit is used for whether driving hummer work according to the level decision that receives;
Described hummer is used for sending alarm call to the user.
Described mobile phone burglar alarm, wherein, the signal that the setting of described signal amplifier enlargement factor is satisfied after amplifying can be discerned by signal comparator.
Described mobile phone burglar alarm, wherein, described energy storage device comprises first inductance, described first inductance, one end ground connection, the other end connects the end that picks out of antenna.
Described mobile phone burglar alarm, wherein, described diode peak envelope detecting device comprises a diode, an electric capacity and a resistance, the input end of the just very diode peak envelope detecting device of described diode, negative pole is the output terminal of diode peak envelope detecting device, and the non-earth terminal that picks out the end and first inductance of the positive pole of described diode and antenna has public wiring point; Described electric capacity and resistance parallel connection, and the negative pole of a terminating diode, other end ground connection.
Described mobile phone burglar alarm, wherein, the reference voltage in the described input signal comparer is set to adjustable, controls the safe distance of mobile phone apart from mobile phone burglar alarm by regulating described reference voltage generator.
A kind of handset anti-theft alarm method, it may further comprise the steps:
A: receive the radiofrequency signal that mobile phone constantly sends;
B: the energy that improves the radiofrequency signal that receives;
C: radiofrequency signal is converted to simulating signal;
D: simulating signal is amplified;
E: change amplified analog signal into digital signal, and by relatively judging output high level or low level with reference voltage;
F: select whether to drive alarm according to the high level that receives or low level and make actuation of an alarm.
Described handset anti-theft alarm method wherein, improves the energy of signal by inductance among the described step B.
Described handset anti-theft alarm method, wherein, step e is concrete to be judged and is: when digital signal during greater than reference voltage, output low level; When digital signal during less than reference voltage, the output high level.
Described handset anti-theft alarm method, wherein, step F is specially: drive alarm when receiving high level and make actuation of an alarm; Do not drive alarm when receiving low level and make actuation of an alarm.
Described handset anti-theft alarm method wherein, is controlled the distance range of antitheft mobile phone protection by the scope of regulating reference voltage in the described step e.
Beneficial effect of the present invention: the present invention adopts the radiofrequency signal that receives mobile phone to make mobile phone burglar alarm, make simply, and cost is very low, easy to carry.Major function be mobile phone burglar alarm under opening, mobile phone just can not be away from mobile phone burglar alarm, in case away from the warning of will sounding a buzzer of, alarm.
Description of drawings
Fig. 1 is the method flow diagram of handset anti-theft alarm method provided by the present invention;
Fig. 2 is the structured flowchart of mobile phone burglar alarm provided by the present invention;
Fig. 3 is antenna, energy storage device, diode peak envelope detecting device three's a circuit connection diagram;
Fig. 4 is the detection diagram figure of diode peak envelope detecting device.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.
Be illustrated in figure 1 as method flow diagram of the present invention, it may further comprise the steps:
A: receive the radiofrequency signal that mobile phone constantly sends;
Mobile phone self can constantly be launched radiofrequency signal, so guaranteed the design basis of this method.
B: the energy that improves the radiofrequency signal that receives;
Because radiofrequency signal is fainter,, improve energy so earlier radiofrequency signal is passed through " energy storage device " energy storage.
C: radiofrequency signal is converted to simulating signal;
D: simulating signal is amplified;
This simulating signal also is smaller signal, so this simulating signal will be amplified to the signal that " signal comparator " can recognize by " signal amplifier ".
E: change amplified analog signal into digital signal, and high level or low level by relatively judging with reference voltage;
Amplified analog signal is input to " signal comparator " signal is become digital signal.When mobile phone when the mobile phone burglar alarm, relatively (reference voltage can be adjusted for signal after the amplification and reference voltage, so that the scope that the control mobile phone is reported to the police apart from mobile phone burglar alarm), this signal is during more than or equal to reference voltage, and signal comparator is output as low level; When mobile phone during away from mobile phone burglar alarm, this simulating signal becomes very little voltage, and during less than reference voltage, signal comparator is output as high level.
F: select whether to drive alarm according to the high level that receives or low level and make actuation of an alarm.
The high-low level of signal comparator is input to " hummer control circuit ", and when input signal was high level, hummer rang, and when input signal was low level, hummer did not ring.The function of reporting to the police when realizing mobile phone away from mobile phone burglar alarm.
Be illustrated in figure 2 as the structured flowchart of mobile phone burglar alarm of the present invention, the construction module that described mobile phone burglar alarm comprises has antenna 11, energy storage device 12, diode peak envelope detecting device 13, signal amplifier 14, signal comparator 15, hummer control circuit 17, hummer 18, wherein, each sequence of modules connects, and this mobile phone burglar alarm also includes in a reference voltage generator 16, these reference voltage generator 16 input signal comparers 15.
When stating mobile phone burglar alarm in the use, at first, open this alarm, because mobile phone can constantly send radiofrequency signal, when mobile phone prevented reporting to the police robber's device near mobile phone, mobile phone burglar alarm just received this faint radiofrequency signal by antenna 11.
Because radiofrequency signal is fainter, antenna receiving signal very little (being generally the milliwatt level) so earlier radiofrequency signal is passed through the energy storage device energy storage, improves energy.The method that energy is provided that the present invention is selected is to increase by an inductance, first inductance L 1 as shown in Figure 3, and an end ground connection of this first inductance L 1, the other end connects picking out of antenna 11 and holds 110.
After promptly boosting after signal improves through energy, promptly be transfused in the diode peak envelope detecting device 13 radiofrequency signal is converted to simulating signal.Referring to Fig. 3, this diode peak envelope detecting device 13 comprises a diode D1, a capacitor C 1 and a resistance R 1, the positive pole 131 of described diode D1 is the input end of diode peak envelope detecting device, negative pole 132 is the output terminal of diode peak envelope detecting device, and the positive pole 131 of described diode has public wiring point with the non-earth terminal 121 that picks out end 110 and first inductance of antenna; Described capacitor C 1 and resistance R 1 parallel connection, and the negative pole 132 of a terminating diode D1, other end ground connection.
One of them core technology of the present invention is diode peak envelope detecting device 13, says the principle of diode peak envelope detecting device 13 below in detail: detection process is exactly signal source is given capacitor C 1 charging and 1 discharge of 1 pair of resistance R of capacitor C by diode D1 alternately repeating process in fact.Please participate in Fig. 4, suppose input signal for sinusoidal wave, we explain detection process by figure:
As input signal U
iStart from scratch when increasing, because the high-frequency resistance of capacitor C 1 is very little, U
iAlmost all be added to the two ends of diode D1, C1 doubly charges, the conducting resistance R of D1
DVery little, charging current is very big, constant R during again because of charging
D* C1 is very little, and the voltage on the electric capacity is set up very soon, and this voltage oppositely is added in again on the D1, and this moment, the voltage on the D1 was voltage poor on signal source voltage and the electric capacity, and the voltage on electric capacity equals U
iThe time, D1 by, along with U
iContinuation descend, there is certain closing time in D1, during this period in capacitor C 1 conduction period charge stored discharge by R1.Because of discharge constant R
D* C1 is bigger, and it is slower to discharge, and descends not for a long time U at capacitance voltage
iNext cycle arrive, work as U
iDuring greater than the voltage on the electric capacity, D1 is conducting once more, and capacitor C 1 is got back additional on the basis of original stored charge amount, and the voltage on the electric capacity is further improved.Then, continue above-mentioned discharge, charging process, the discharge charge amount of C1 equated that just reaching dynamic balance state is steady-working state when the voltage on capacitor ended with D1.
Diode current I
DComprise average weight I
AvAnd high fdrequency component.I
AvThe average voltage U that the resistance R of flowing through 1 forms
Av, it is exactly the useful output voltage of wave detector.Because high frequency ripple voltage is very little, this voltage just almost is equal to the output voltage of wave detector.
Continuation is referring to Fig. 1, after radiofrequency signal is converted to simulating signal, because this simulating signal also is smaller signal, so this simulating signal will be amplified by signal amplifier 14, about the standard of determining of signal amplifier 14 enlargement factors be: satisfy amplified analog signal and can reach the signal that signal comparator 15 can recognize.Change it into digital signal after signal comparator 15 identification signals, and the reference voltage of the digital signal that conversion is obtained and extraneous input relatively, when mobile phone is closer apart from this mobile phone burglar alarm, energy through the signal after amplification and the conversion process is just more intense, this moment and reference voltage are relatively just greater than reference voltage, and described signal comparator 15 will be exported a low level; And when mobile phone was distant apart from this mobile phone burglar alarm, just more weak through the energy of the signal after amplification and the conversion process, this moment, the energy of signal just may be less than reference voltage, and signal comparator 15 will be exported a high level.The size of described reference voltage can be regulated as required, when reference voltage is bigger, just must guarantee the distance of mobile phone and mobile phone burglar alarm will be very near could output low level, the distance of mobile phone and mobile phone burglar alarm just can slightly far some can guarantee output low level when reference voltage is less.
Hummer control circuit 17 is selected whether to drive hummer according to the low level of signal comparator 15 output or high level and is made actuation of an alarm, when hummer control circuit 17 receive be low level the time just do not drive hummer 18 work, when hummer control circuit 17 receive be high level the time will drive hummer 18 work, thereby prompting is reported to the police, and guarantees the security of mobile phone.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010169580.9A CN101819707B (en) | 2010-04-30 | 2010-04-30 | Mobile phone burglar alarm and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010169580.9A CN101819707B (en) | 2010-04-30 | 2010-04-30 | Mobile phone burglar alarm and method |
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| Publication Number | Publication Date |
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| CN101819707A true CN101819707A (en) | 2010-09-01 |
| CN101819707B CN101819707B (en) | 2013-11-06 |
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| CN201010169580.9A Expired - Fee Related CN101819707B (en) | 2010-04-30 | 2010-04-30 | Mobile phone burglar alarm and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762692A (en) * | 2013-02-05 | 2014-04-30 | 李明 | Mobile power source for achieving anti-lost function of mobile equipment based on environment recognition |
| WO2014121578A1 (en) * | 2013-02-05 | 2014-08-14 | Li Ming | Anti-lost device for implementing anti-lost function of mobile device |
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| CN102411828A (en) * | 2011-11-07 | 2012-04-11 | 天津银箭科技有限公司 | Intelligent burglar alarm for mobile phone |
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| FR2813421A1 (en) * | 2000-08-28 | 2002-03-01 | Marc Vincent | Mobile phone antitheft unit has transponder monitors distance from holster sounds alarm |
| US20060089168A1 (en) * | 2003-03-20 | 2006-04-27 | Yasuto Ueda | Communication system, communication method, and program thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103762692A (en) * | 2013-02-05 | 2014-04-30 | 李明 | Mobile power source for achieving anti-lost function of mobile equipment based on environment recognition |
| WO2014121578A1 (en) * | 2013-02-05 | 2014-08-14 | Li Ming | Anti-lost device for implementing anti-lost function of mobile device |
| CN103762692B (en) * | 2013-02-05 | 2016-05-18 | 李明 | Based on the portable power source of realizing the anti-lost function of mobile device of environment identification |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101819707B (en) | 2013-11-06 |
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