CN201237822Y - Anti-stealing wallet - Google Patents
Anti-stealing wallet Download PDFInfo
- Publication number
- CN201237822Y CN201237822Y CNU2008200539680U CN200820053968U CN201237822Y CN 201237822 Y CN201237822 Y CN 201237822Y CN U2008200539680 U CNU2008200539680 U CN U2008200539680U CN 200820053968 U CN200820053968 U CN 200820053968U CN 201237822 Y CN201237822 Y CN 201237822Y
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- CN
- China
- Prior art keywords
- wallet
- alarm
- transformer
- phase detector
- comparer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Burglar Alarm Systems (AREA)
Abstract
The utility model discloses a wallet guarding against theft, which is characterized in that the wallet comprises an alarm circuit; the alarm circuit comprises a high frequency oscillation circuit, a phase demodulator, a voltage comparator and an alarm; the high frequency oscillation circuit is connected with a metal sheet as a part of a capacitive transducer; the output signal of the high frequency oscillation circuit is connected with the input end of the phase demodulator; the output end of the phase demodulator is connected with one input end of the voltage comparator; the other end of the voltage comparator is connected with a constant voltage signal; the output end of the voltage comparator is connected with the alarm. The oscillation circuit is a transformer feedback-type oscillation circuit. The wallet can give an alarm in real time, and is very practical.
Description
Technical field
The utility model belongs to sensor and electronic technology field, relates to a kind of antitheft wallet.
Background technology
Existing wallet does not generally have anti-theft feature, some wallet with anti-theft feature but has many shortcomings, anti-theft measure such as some wallet is that wallet and belt are not easy to take off wallet in conjunction with tightr so that robber, it is not too convenient that this wallet uses, it is just to report to the police when opening wallet that a kind of wallet is arranged, when therefore wallet is stolen, can not in time provide warning.
The utility model content
The utility model wants the technical solution problem that a kind of wallet is provided, and can realize Realtime Alerts, and easy to use.
The utility model is to solve the problems of the technologies described above the technical scheme that is adopted to be:
A kind of antitheft wallet is characterized in that, comprises warning circuit, and this warning circuit comprises a high-frequency oscillating circuits, phase detector, voltage comparator and alarm; This high-frequency oscillating circuits connects the sheet metal as a capacitive transducer part, the output signal of this high-frequency oscillating circuits connects the input end of phase detector, an input end of the output termination comparer of phase detector, another input termination one constant voltage signal of comparer, the output terminal of comparer device taking alarm.
Described oscillatory circuit is a transformer feedback formula oscillatory circuit.
Described transformer feedback formula oscillatory circuit is: a termination high level after the primary coil L1 parallel connection of a tunable capacitor C0 and transformer T1, and the other end is in series with a capacitor C 1 and a sheet metal; The secondary coil L3 of transformer T1 draws output voltage signal; The end of the secondary coil L2 terminating resistor RB1 of the same name of transformer T1, another termination high level of resistance R B1, secondary coil L2 end of the same name are also by a capacitance resistance parallel circuit ground connection; The different name end of secondary coil L2 also connects the base stage of triode T1, the centre tap of the collector wiring circle L1 of triode T1, and the emitting stage of triode T1 is by a resistance capacitance parallel circuit ground connection.
As improvement, also be in series with a high frequency limiters between the output terminal of described high-frequency oscillating circuits and the input end of phase detector.
Described alarm is a diode and hummer series connection.
Described comparer adopts operational amplifier, and this operational amplifier adopts the wiring of current drives form, promptly adopts the wiring of non-feedback form.
The beneficial effects of the utility model have:
Realtime Alerts when the utility model can realize that wallet is stolen.When robber's hand during near wallet, robber's hand and sheet metal constitute a capacitance type sensor, cause electric capacity to become big, and the output signal frequency of its oscillatory circuit reduces, and the output voltage of phase detector reduces, and comparer output high level drives alarm equipment alarm.Thereby arrive the effect that threatens robber, protection user property.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model embodiment 1.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment 1:
As shown in Figure 1, elements such as V1, L1, C0, Cx constitute transformer feedback formula oscillatory circuit, the voltage signal f of output high frequency, and C0 adopts adjustable electric capacity in the oscillatory circuit, and its appearance value is adjustable at 4～20uF; The incoming frequency and the output voltage of phase detector are directly proportional, and promptly f becomes big, and it is big that Uout also becomes.Sheet metal and people's hand constitutes the capacitance type sensor of a variable capacitance; A plurality of button cell serial or parallel connections are adopted in power supply in the wallet, obtain the supply voltage of 5V.Sheet metal is arranged in the wallet.
The course of work of present embodiment is:
When not having object near sheet metal, the frequency of the voltage signal that oscillatory circuit produces is f0, and behind this voltage signal process high frequency limiters, its signal becomes the signal of similar square wave, is convenient to the next stage electric circuit inspection.This signal is through behind the phase detector, export a voltage U 0 in the negative input end of operational amplifier (adopting LM324), the adjustable side of the positive input termination adjustable resistance RP of operational amplifier, the effect of this adjustable resistance is by regulating resistance, thereby regulate the pressure drop (voltage divider principle) on this adjustable resistance, this pressure drop is the magnitude of voltage of operational amplifier negative input end, operational amplifier does not connect feedback resistance, therefore this operational amplifier is operated in the current drives pattern, realize the function of comparer, if the voltage of positive input terminal is higher than the voltage U of negative input end-(be U+〉U-), then output voltage is a high level, on the contrary output low level.Regulate the positive input terminal voltage U of operational amplifier+be lower than phase detector output voltage U 0 (the phase detector output voltage when hand keeps clear of sheet metal) of (when not reporting to the police) when usual in advance.Operational amplifier output low level then, not conducting of diode D1, hummer BZ does not work.
When robber's hand close, be diminishing of hand and sheet metal apart from x, it is big that the electric capacity of capacitive transducer becomes, so the frequency f of the voltage signal of oscillatory circuit output reduces f＜f0, therefore through output voltage U out＜U0 behind the phase detector, and Uout＜U+, so comparer (operational amplifier) output high level, diode D1 conducting, hummer BZ opens, and realizes reporting to the police.
Claims (6)
1. an antitheft wallet is characterized in that, comprises warning circuit, and this warning circuit comprises a high-frequency oscillating circuits, phase detector, voltage comparator and alarm; This high-frequency oscillating circuits connects the sheet metal as a capacitive transducer part, the output signal of this high-frequency oscillating circuits connects the input end of phase detector, an input end of the output termination comparer of phase detector, another input termination one constant voltage signal of comparer, the output terminal of comparer device taking alarm.
2. antitheft wallet as claimed in claim 1 is characterized in that, described oscillatory circuit is a transformer feedback formula oscillatory circuit.
3. antitheft wallet as claimed in claim 2 is characterized in that, described transformer feedback formula oscillatory circuit is: a termination high level after the primary coil L1 parallel connection of a tunable capacitor C0 and transformer T1, and the other end is in series with a capacitor C 1 and a sheet metal; The secondary coil L3 of transformer T1 draws output voltage signal; The end of the secondary coil L2 terminating resistor RB1 of the same name of transformer T1, another termination high level of resistance R B1, secondary coil L2 end of the same name are also by a capacitance resistance parallel circuit ground connection; The different name end of secondary coil L2 also connects the base stage of triode T1, the centre tap of the collector wiring circle L1 of triode T1, and the emitting stage of triode T1 is by a resistance capacitance parallel circuit ground connection.
4. as claim 1,2 or 3 described antitheft wallets, it is characterized in that, also be in series with a high frequency limiters between the output terminal of described high-frequency oscillating circuits and the input end of phase detector.
5. antitheft wallet as claimed in claim 4 is characterized in that, described alarm is a diode and hummer series connection.
6. antitheft wallet as claimed in claim 5 is characterized in that, described comparer adopts operational amplifier, and this operational amplifier adopts the wiring of current drives form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200539680U CN201237822Y (en) | 2008-08-04 | 2008-08-04 | Anti-stealing wallet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200539680U CN201237822Y (en) | 2008-08-04 | 2008-08-04 | Anti-stealing wallet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201237822Y true CN201237822Y (en) | 2009-05-13 |
Family
ID=40650557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200539680U Expired - Fee Related CN201237822Y (en) | 2008-08-04 | 2008-08-04 | Anti-stealing wallet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201237822Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104063978A (en) * | 2014-06-20 | 2014-09-24 | 上海斐讯数据通信技术有限公司 | Mobile terminal anti-theft method, mobile terminal anti-theft device applying method and mobile terminal |
| CN109410499A (en) * | 2018-11-26 | 2019-03-01 | 深圳和而泰智能控制股份有限公司 | A kind of warning circuit and alarm |
-
2008
- 2008-08-04 CN CNU2008200539680U patent/CN201237822Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104063978A (en) * | 2014-06-20 | 2014-09-24 | 上海斐讯数据通信技术有限公司 | Mobile terminal anti-theft method, mobile terminal anti-theft device applying method and mobile terminal |
| CN109410499A (en) * | 2018-11-26 | 2019-03-01 | 深圳和而泰智能控制股份有限公司 | A kind of warning circuit and alarm |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 |