CN204719903U - For the anti-theft device of keyboard or mouse - Google Patents
For the anti-theft device of keyboard or mouse Download PDFInfo
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- CN204719903U CN204719903U CN201520427549.9U CN201520427549U CN204719903U CN 204719903 U CN204719903 U CN 204719903U CN 201520427549 U CN201520427549 U CN 201520427549U CN 204719903 U CN204719903 U CN 204719903U
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Abstract
For an anti-theft device for keyboard or mouse, this device comprises curent change detection module, when keyboard or mouse are in energising duty, for detecting the change of its working current; Internal resistance change detection module, when keyboard or mouse are in off-position, for detecting the change of its internal resistance; Processing module, the change information of the internal resistance that the change information of the working current that received current change detection module exports and/or internal resistance change detection module export, and according to the change of working current or the change output alarm control signal of internal resistance; Alarm module, the alarm control signal that receiving processing module exports, and report to the police according to this alarm control signal.Solve existing keyboard anti-theft device wrong report easily occurs and the antitheft technical matters of mouse can not be used for.No matter keyboard or mouse are in energising duty or off-position can be monitored in real time, and do not need manual switching.
Description
Technical field
The utility model relates to technical field of security and protection, specifically, relates to a kind of anti-theft device for keyboard or mouse.
Background technology
Along with popularizing of computer; computer has more and more become people's Working Life inalienable part; concentrating at some uses the public place (as: Internet bar, school computer center etc.) of computer that keyboard and the stolen phenomenon of mouse often can occur; for preventing keyboard stolen; someone is at keyboard underneath pressure sensor device; take away once there be people to be picked up by keyboard, alarm is just reported to the police.Such as, publication number is that the utility model patent of CN203838824U discloses a kind of keyboard burglar alarm, it comprises pressure transducer, voltage stabilizing chip, hidden switch, operational amplifier A 1, operational amplifier A 2, NPN triode VT1, NPN triode VT2, NPN triode VT3, resistance R1-R6, slide rheostat Rp, electric capacity C, loudspeaker BL, full bridge rectifier UR, thyristor VTH and multiple LED, pressure transducer is arranged on the keyboard drawer of table for computer, and keyboard drawer arranges keyboard.For pressure transducer provides working power after voltage stabilizing chip carries out voltage stabilizing process to the direct supply that full bridge rectifier UR exports.When warning function opened by needs, then closed hidden switch.When keyboard is pressed on keyboard drawer, pressure transducer detects pressure signal, and after amplifying circuit, export the voltage signal of 1-5V through R4, transfer low level to through not gate D, VT1 does not have base voltage, cut-off, and loudspeaker do not ring, LED does not work.Once keyboard is moved away from keyboard drawer, pressure transducer can't detect pressure signal, and R4 no-voltage signal exports, and transfers high level to through not gate D, drive VT1, VT2, VT3 conducting, horns blared, carries out acoustic alarm, to VTH trigger voltage, VTH conducting, multiple LED is bright, carries out light warning.
And the shortcoming of this anti-theft device is: 1. when people normally use, once keyboard be moved and causes keyboard to leave keyboard drawer or desktop, will report by mistake by triggered alarm; 2. this device can not prevent mouse stolen.
Summary of the invention
For this reason, technical problem to be solved in the utility model is that existing keyboard anti-theft device easily false triggering occurs thus causes false alarm, and mouse can not be prevented stolen, thus propose a kind of false triggering to be less likely to occur, the anti-theft device that keyboard also can be used for mouse can be used for.
For solving the problems of the technologies described above, the utility model provides following technical scheme:
For an anti-theft device for keyboard or mouse, comprising:
Curent change detection module, when keyboard or mouse are in energising duty, for detecting the change of its working current;
Internal resistance change detection module, when keyboard or mouse are in off-position, for detecting the change of its internal resistance;
Processing module, the change information of the internal resistance that the change information of the working current that received current change detection module exports and/or internal resistance change detection module export, and according to the change of working current or the change output alarm control signal of internal resistance;
Alarm module, the alarm control signal that receiving processing module exports, and report to the police according to this alarm control signal.
Preferably, curent change detection module and/or internal resistance change detection module are connected with processing module respectively by wire transmission module and/or wireless transport module, or are directly electrically connected by the circuit on printed circuit board (PCB) and described processing module (4).
Preferably, alarm module comprises audible alarm unit and/or light alarm unit and/or information notification unit and/or the long-range transmission unit again of warning message.
Preferably, the keyboard that internal resistance change detection module detects or mouse internal resistance are the internal resistance of source or data line internal resistance.
Preferably, curent change detection module comprises:
Equivalent voltage testing circuit, comprises for the change of the working current of keyboard or mouse is converted to the voltage conversion circuit of change in voltage and is used for measuring the first metering circuit of converted voltage; And/or,
Equivalence on off operating mode testing circuit, comprises for the change of the working current of keyboard or mouse being converted to the on off operating mode change-over circuit of connecting and disconnecting of the circuit state change and being used for detecting the second metering circuit of the rear connecting and disconnecting of the circuit state of conversion; And/or,
Equivalent resistance testing circuit, comprises for the change of the working current of keyboard or mouse being converted to the resistance change-over circuit of resistance change and being used for measuring the 3rd metering circuit of the rear resistance of conversion; And/or,
Equivalent current testing circuit, comprises for the change of the working current of keyboard or mouse being converted to the current converter circuit of another kind of curent change and being used for measuring the 4th metering circuit of conversion after-current; And/or,
Direct-detection current circuit, is connected on the operating circuit of keyboard or mouse, for directly measuring the working current of keyboard or mouse.
Preferably, voltage conversion circuit is connected on the operating circuit of keyboard or mouse, and the first metering circuit is in parallel with voltage conversion circuit.
Preferably, on off operating mode change-over circuit comprises the first gate-controlled switch circuit and the first resistance, first gate-controlled switch circuit comprises the first on-off circuit and the first control circuit for controlling the first on-off circuit break-make, first control circuit is connected on the operating circuit of keyboard or mouse, ground connection after one termination supply voltage of the first resistance, the other end and the first switching circuit in series, the first on-off circuit is in parallel with the second metering circuit.
Preferably, resistance change-over circuit comprises the second gate-controlled switch circuit and the second resistance, second gate-controlled switch circuit comprises second switch circuit and the second control circuit for controlling second switch circuit, second control circuit is connected on the operating circuit of keyboard or mouse, and the second resistance, second switch circuit and the 3rd metering circuit are connected in series.
Preferably, current converter circuit comprises the 3rd gate-controlled switch circuit and the 3rd resistance, 3rd gate-controlled switch circuit comprises the 3rd on-off circuit and the 3rd control circuit for controlling the 3rd on-off circuit, 3rd control circuit is connected on the operating circuit of keyboard or mouse, one termination power supply of the 3rd resistance, the other end and the 3rd on-off circuit, the 4th metering circuit are connected in series rear ground connection.
Preferably, internal resistance change detection module comprises:
Equivalent internal resistance testing circuit, comprises internal resistance change-over circuit and the resistance measuring circuit in parallel with internal resistance change-over circuit, and internal resistance change-over circuit is used for the internal resistance of keyboard or mouse to change the change being converted to another kind of resistance; And/or,
The direct metering circuit of internal resistance, for directly measuring the internal resistance of keyboard or mouse to obtain its change.
Preferably, internal resistance change-over circuit comprises the 4th resistance and the 4th gate-controlled switch circuit, the first end of the 4th resistance is connected with the first end of the 4th gate-controlled switch circuit, two in the power end of the second end of the 4th resistance, the control end of the 4th gate-controlled switch circuit and keyboard or mouse, earth terminal, correction data end and negative data end are connected respectively, and one end of resistance measuring circuit is connected with the second end of the 4th resistance, the other end is connected with the second end of the 4th gate-controlled switch.
Technique scheme of the present utility model has the following advantages compared to existing technology:
The anti-theft device for keyboard or mouse that the utility model provides, when being detected the change of keyboard or mouse its working current when the work of energising by curent change detection module and detected keyboard or mouse power-off by internal resistance change detection module, the change of its resistance carrys out Real-Time Monitoring keyboard or whether mouse is stolen, it can not leave desktop or keyboard holder because of keyboard and false alarm occur, no matter keyboard or mouse are in energising duty or off-position, can monitor in real time.Do not need the switch by this device of manual switching, the anti-theft switch of keyboard or mouse effectively can be prevented to be closed or break down and cause keyboard or the stolen situation of mouse to occur yet.
Accompanying drawing explanation
Fig. 1 is a kind of anti-theft device structural representation for keyboard or mouse of the utility model embodiment;
Fig. 2 is the USB interface of keyboard or mouse or the structural representation of PS/2 interface;
Fig. 3 is the electrical block diagram of a kind of direct measurement keyboard of the utility model embodiment or the working current of mouse;
Fig. 4 is a kind of equivalent voltage testing circuit structural representation of the utility model embodiment;
Fig. 5 is the one equivalence on off operating mode testing circuit structural representation of the utility model embodiment;
Fig. 6 is a kind of equivalent resistance testing circuit structural representation of the utility model embodiment;
Fig. 7 is a kind of equivalent current testing circuit structural representation of the utility model embodiment;
Fig. 8 is a kind of equivalent internal resistance testing circuit structural representation of the utility model embodiment;
Fig. 9 is the direct metering circuit structural representation of a kind of internal resistance of the utility model embodiment;
Figure 10 is a kind of keyboard of the utility model embodiment or the theft preventing method process flow diagram of mouse;
Figure 11 is a kind of method flow diagram detecting keyboard or mouse performance electric current of the utility model embodiment.
In figure, Reference numeral is expressed as: 1-keyboard or mouse, 2-curent change detection module, 3-internal resistance change detection module, 4-processing module, 5-alarm module, 61-first metering circuit, 62-second metering circuit, 63-the 3rd metering circuit, 64-the 4th metering circuit, 65-the 5th metering circuit, 7-voltage conversion circuit, 8-first resistance, 9-first gate-controlled switch circuit, 10-second resistance, 11-second gate-controlled switch circuit, 12-the 3rd resistance, 13-the 3rd gate-controlled switch circuit, 14-the 4th resistance, 15-the 4th gate-controlled switch circuit, 16-resistance measuring circuit, 17-internal resistance measurement circuit.
Embodiment
In order to make those skilled in the art person understand content of the present utility model better, below in conjunction with drawings and Examples, technical scheme provided by the utility model is described in further detail.
As shown in Figure 1, present embodiments provide a kind of anti-theft device for keyboard or mouse, comprising:
Curent change detection module 2, when keyboard or mouse 1 are in energising duty, for detecting the change of its working current.
Internal resistance change detection module 3, when keyboard or mouse 1 are in off-position, for detecting the change of its internal resistance.
Processing module 4, the change information of the working current that received current change detection module 2 exports when keyboard or mouse 1 are in energising duty, the change information of the internal resistance that internal resistance change detection module 3 exports then is received when keyboard or mouse 1 are in off-position, and according to the change of working current or the change output alarm control signal of internal resistance.This processing module 4 has data analysis function, communication function and alarm control function, and it can be single-chip microcomputer, ARM or other intelligent chips.
Alarm module 5, the alarm control signal that receiving processing module 4 exports, and report to the police according to this alarm control signal.
Particularly, curent change detection module 2 is connected with processing module 4 respectively by wire transmission module or wireless transport module with internal resistance change detection module 3, the working current change information of keyboard or mouse 1 or internal resistance change information real time remote can be realized to be transferred to processing module 4, to realize remote alarming function and information remote memory function.Also can be only have curent change detection module 2 to be connected with processing module 4 by wire transmission module or wireless transport module, or only have internal resistance change detection module 3 to be connected with processing module 4 by wire transmission module or wireless transport module.Can also be that curent change detection module 2 is connected with processing module 4 with wireless transport module by wire transmission module respectively with internal resistance change detection module 3, or only have curent change detection module 2 to be connected with processing module 4 with wireless transport module respectively by wire transmission module, or internal resistance change detection module 3 is only had to be connected with processing module 4 with wireless transport module respectively by wire transmission module.Processing module 4 also can be arranged on same printed circuit board with curent change detection module 2 and internal resistance change detection module 3 and also directly be electrically connected.Processing module 4 and alarm module 5 can be arranged on same printed circuit board and also directly be electrically connected, and also can be separately positioned on the place of wide apart, and by wired or wireless network communication.
When booting computer, keyboard or mouse 1 are energized work, utilize curent change detection module 2 to detect the working current change of keyboard or mouse 1 in real time, and the change information of acquisition is transferred to processing module 4.Once keyboard or mouse 1 stolen, the operating circuit of keyboard or mouse 1 can be destroyed, and working current also will change, and processing module 4 analyzes this ANOMALOUS VARIATIONS, if need to report to the police, output alarm control signal is to alarm module 5, and alarm module 5 is reported to the police.And when keyboard or mouse 1 power-off, the internal resistance change of internal resistance change detection module 3 meeting timing or in real time detection keyboard or mouse 1, and the internal resistance change information of acquisition is transferred to processing module 4, once keyboard or mouse 1 stolen, the circuit detecting keyboard or mouse 1 can be destroyed, therefore, the resistance that internal resistance change detection module 3 detects also can change, processing module 4 analyzes this ANOMALOUS VARIATIONS, if need to report to the police, output alarm control signal is to alarm module 5, and alarm module 5 is reported to the police.This anti-theft device when keyboard and mouse 1 are energized work and power-off time can realize fully-automatic intelligent anti-thefting monitoring.And be pulled out except non-keyboard or mouse 1, otherwise generally can not there is false triggering in this anti-theft device.In addition, it is antitheft that this anti-theft device is not only applicable to keyboard, is applicable to mouse antitheft yet.This device can be combined with other products or system and form multi-functional Iarge-scale system.
Particularly, alarm module 5 comprises audible alarm unit and light alarm unit and information notification unit and the long-range transmission unit again of warning message, also can only include wherein one or both, also or comprise the alarm unit of other type of alarms.The sound of this alarm module 5 and light alarm unit can utilize loudspeaker, sound equipment and hummer etc. to carry out audible alarm, also can the prompting of the light such as LED report to the police.And warning message can be sent to mobile phone, the apparatus such as computer of specifying by wireless communication signals by information notification unit.Warning message can be transferred to the receiving end of farther place by the long-range transmission unit again of warning message by wired or wireless network, when alarm module has the intelligent function such as communication and warning, it can be the circuit comprising single-chip microcomputer, ARM or other intelligent chips, also can be the smart machines such as computer.
Particularly, above-mentioned internal resistance change detection module 3 detect keyboard or mouse 1 internal resistance be the internal resistance of source or data line internal resistance.As shown in Figure 2, for keyboard or the USB interface of mouse or the structural representation of PS/2 interface, comprise power end Vcc, negative data end D-(data terminal Data), correction data end D+(clock end CLK) and earth terminal Gnd, the working current that curent change detection module 2 detects just is through the electric current on power end Vcc, earth terminal Gnd.The internal resistance that internal resistance change detection module 3 detects is resistance between power end Vcc and earth terminal Gnd, resistance between (i.e. the internal resistance of source) or power end Vcc and negative data end D-, (i.e. data line internal resistance) or the resistance between power end Vcc and correction data end D+, (i.e. data line internal resistance) or the resistance between negative data end D-and correction data end D+, (i.e. data line internal resistance) or the resistance between negative data end D-and earth terminal Gnd, (i.e. data line internal resistance) or the resistance between correction data end D+ and earth terminal Gnd, (i.e. data line internal resistance).
The physical circuit of curent change detection module 2 has multiple, changes or other equivalent variable signals for real-time or timing acquisition keyboard or mouse 1 working current.Can comprise in equivalent voltage testing circuit, equivalent on off operating mode testing circuit, equivalent resistance testing circuit, equivalent current testing circuit and direct-detection current circuit one or more.Namely, curent change detection module 2 only can adopt the working current change of wherein a kind of electric circuit inspection keyboard or mouse 1, also can adopt multiple change-over circuit to detect simultaneously or adopt simultaneously direct-detection current circuit and wherein a kind of change-over circuit or multiple change-over circuit to improve detection fiduciary level.Wherein, equivalent voltage testing circuit, comprises for the change of the working current of keyboard or mouse 1 is converted to the voltage conversion circuit 7 of change in voltage and is used for measuring the first metering circuit 61 of converted voltage.Equivalence on off operating mode testing circuit, comprises for the change of the working current of keyboard or mouse 1 being converted to the on off operating mode change-over circuit of the change of connecting and disconnecting of the circuit state and being used for detecting the second metering circuit 62 of the rear connecting and disconnecting of the circuit state of conversion.Equivalent resistance testing circuit, comprises for the change of the working current of keyboard or mouse 1 being converted to the resistance change-over circuit of resistance change and being used for measuring the 3rd metering circuit 63 of the rear resistance of conversion.Equivalent current testing circuit, comprises for the change of the working current of keyboard or mouse 1 being converted to the current converter circuit of another kind of curent change and being used for measuring the 4th metering circuit 64 of conversion after-current.Direct-detection current circuit, is connected on the operating circuit of keyboard or mouse 1, for directly measuring the working current of keyboard or mouse 1.
As shown in Figure 3, above-mentioned direct-detection current circuit comprises the 5th metering circuit 65,5th metering circuit 65 can be the current gear of reometer or multimeter, the direct operating circuit being connected on keyboard or mouse 1 can measure its working current, and VCC is the power supply of powering to keyboard or mouse 1.
Particularly, as shown in Figure 4, above-mentioned voltage conversion circuit 7 is connected on the operating circuit of keyboard or mouse 1, and the first metering circuit 61 is in parallel with voltage conversion circuit 7.This voltage conversion circuit 7 can be a resistance, when keyboard or mouse 1 are energized work, its working current, through this resistance, this resistance produces voltage, first metering circuit 61 can be voltage table, and this voltage table directly can to measure the ohmically voltage as voltage conversion circuit 7.This voltage conversion circuit 7 can also be that other electric current turns potential circuit.
Particularly, as shown in Figure 5, on off operating mode change-over circuit comprises the first gate-controlled switch circuit 9 and the first resistance 8, first gate-controlled switch circuit 9 comprises the first on-off circuit and the first control circuit for controlling the first on-off circuit break-make, first control circuit is connected on the operating circuit of keyboard or mouse 1, ground connection after one termination supply voltage VCC of the first resistance 8, the other end and the first switching circuit in series, the first on-off circuit is in parallel with the second metering circuit 62.First gate-controlled switch circuit 9 can be specifically a relay, and accordingly, first control circuit is the coil circuit of relay, and the first on-off circuit is the contact circuit of relay.Keyboard or mouse 1 be energized normally work time, the coil circuit of relay has electric current, the moving contact of relay and static contact adhesive, VCC, the first resistance 8 and GND form closed-loop path, the voltage that now the second metering circuit 62 records is 0V(ground connection GND), output low level.When keyboard or mouse 1 stolen, its performance loop disconnect, no current on the coil circuit of relay, accordingly, the moving contact of relay and static contact release, the closed-loop path that VCC, the first resistance 8 and GND are formed disconnects, the voltage now the second metering circuit 62 recorded is VCC, exports high level.Thus the change of the working current of keyboard or mouse 1 is converted to the on off operating mode change of circuit by this first gate-controlled switch circuit 9, during output low level, circuit is conducting state, circuit is off-state when exporting high level.In addition, above-mentioned first gate-controlled switch circuit 9 also can be other can convert the change of the working current of keyboard or mouse 1 to represent with the on off operating mode of circuit other circuit.Supply voltage can be the supply voltage of powering to keyboard or mouse 1, also can be other supply voltages.
Particularly, as shown in Figure 6, above-mentioned resistance change-over circuit comprises the second gate-controlled switch circuit 11 and the second resistance 10, second gate-controlled switch circuit 11 comprises second switch circuit and the second control circuit for controlling second switch circuit, second control circuit is connected on the operating circuit of keyboard or mouse 1, and the second resistance 10, second switch circuit and the 3rd metering circuit 63 are connected in series.Above-mentioned second gate-controlled switch circuit 11 can be relay, and accordingly, second control circuit is the coil circuit of relay, and second switch circuit is the contact circuit of relay.When the energising work of keyboard or mouse 1, its working current flows through the coil circuit of relay, the moving contact of relay and static contact adhesive, the 3rd metering circuit 63 and the second resistance 10 loop conducting, and the 3rd metering circuit 63 can record the resistance of the second resistance 10; When keyboard or mouse 1 stolen after, its performance loop is destroyed, and the wire loop of relay does not have electric current, its moving contact and static contact release, the resistance that the 3rd metering circuit 63 now records becomes infinity.Thus the change of the working current of keyboard or mouse 1 can be judged by measuring the resistance change obtained.Being used for the circuit of measuring resistance in 3rd metering circuit 63 has a variety of, and the resistance grade of multimeter such as can be used to measure.The keyboard of different model or the working current of mouse 1 vary in size, in order to simplify the Intelligent Recognition computing of testing circuit and processing module 4, all keyboards or mouse 1 can be converted to a specific resistance value by the electric current when being energized normal work by this resistance change-over circuit.In addition, if the working current of keyboard is converted to a specific electrical resistance, and the working current of mouse is converted to another specific electrical resistance, and processing module 4 can also be facilitated accurately to identify, and keyboard is stolen or mouse is stolen.
Particularly, as shown in Figure 7, above-mentioned current converter circuit comprises the 3rd gate-controlled switch circuit 13 and the 3rd resistance 12,3rd gate-controlled switch circuit 13 comprises the 3rd on-off circuit and the 3rd control circuit for controlling the 3rd on-off circuit, 3rd control circuit is connected on the operating circuit of keyboard or mouse 1, one termination power supply VCC of the 3rd resistance 12, the other end and the 3rd on-off circuit, the 4th metering circuit 64 are connected in series rear ground connection.Wherein, 3rd gate-controlled switch circuit 13 can be relay, accordingly, 3rd control circuit is the coil circuit of relay, 3rd on-off circuit is the contact circuit of relay, when keyboard or mouse 1 are energized work, and the moving contact of relay and static contact adhesive, the loop conducting of power supply VCC, the 3rd resistance 12 and the 4th metering circuit 64, the 4th metering circuit 64 can obtain the electric current in this loop; When keyboard or mouse 1 stolen after, its performance loop is destroyed, there is no working current, the wire loop of relay does not have yet electric current flow through, therefore, the moving contact of relay is released, and the loop of power supply VCC, the 3rd resistance 12 and the 4th metering circuit 64 disconnects, and the electric current that the 4th metering circuit 64 records also is 0A.Thus the working current change of keyboard or mouse 1 is judged by the curent change on the loop of power supply VCC, the 3rd resistance 12 and the 4th metering circuit 64.Wherein, the 4th metering circuit 64 can be the current gear on multimeter, also can be other current measurement circuits.Power supply VCC is the power supply of powering to keyboard or mouse 1, also can use other power supplys herein.The keyboard of different model or the working current of mouse 1 vary in size, in order to simplify the Intelligent Recognition computing of testing circuit and processing module 4, all keyboards or mouse 1 can be converted to the electric current of a particular value by the electric current when being energized normal work by this current converter circuit.In addition, if the working current of keyboard is converted to a particular value electric current, and the working current of mouse is converted to the electric current of another particular value, and processing module 4 can also be facilitated accurately to identify, and keyboard is stolen or mouse is stolen.
Particularly, internal resistance change detection module 3 comprises equivalent internal resistance testing circuit or the direct metering circuit of internal resistance changes to the internal resistance detecting keyboard or mouse 1, and the circuit structure of this internal resistance change detection module 3 is simple, is convenient to realize.Internal resistance change detection module 3 also can comprise equivalent internal resistance testing circuit simultaneously and the direct metering circuit of internal resistance detects the internal resistance change of keyboard or mouse 1 respectively with the fiduciary level improving testing result.
As shown in Figure 8, equivalent internal resistance testing circuit comprises internal resistance change-over circuit and the resistance measuring circuit 16 in parallel with internal resistance change-over circuit, and internal resistance change-over circuit is used for the internal resistance of keyboard or mouse 1 to change the change being converted to another kind of resistance.Particularly, internal resistance change-over circuit comprises the 4th resistance 14 and the 4th gate-controlled switch circuit 15, the first end of the 4th resistance 14 is connected with the first end of the 4th gate-controlled switch circuit 15, two in the power end of the second end of the 4th resistance 14, the control end of the 4th gate-controlled switch circuit 15 and keyboard or mouse 1, earth terminal, correction data end and negative data end are connected respectively, and one end of resistance measuring circuit 16 is connected with the second end of the 4th resistance 14, the other end is connected with the second end of the 4th gate-controlled switch 15.Above-mentioned 4th gate-controlled switch circuit 15 can be a field effect transistor, when keyboard or mouse 1 power-off, utilize resistance measuring circuit 16 measuring resistance, time on its voltage-drop loading exported to the electric power loop or data loop of keyboard or mouse 1, after the grid (i.e. control end) of field effect transistor is loaded with voltage, its first end and the second end conducting, thus most of electric current gets back to resistance measuring circuit 16 after the 4th resistance 14 and the 4th gate-controlled switch 15, the internal resistance that now resistance measuring circuit 16 records approximates the resistance of the 4th resistance 14; And when keyboard or mouse 1 stolen after, the voltage that resistance measuring circuit 16 exports is not loaded into the grid of field effect transistor by keyboard or mouse 1, so its first end and the second end also just can not conductings, and the resistance that now resistance measuring circuit 16 records also can change.Thus by resistance measuring circuit record the change of resistance, judge the internal resistance change of keyboard or mouse 1.The keyboard of different model or the internal resistance difference of mouse 1, the internal resistance of different keyboard or mouse 1 can be converted to the resistance of a specific electrical resistance by internal resistance change-over circuit, to make processing module 4 can easily according to the information output alarm control signal exactly that internal resistance change detection module 3 exports.In addition, when the anti-thefting monitoring of this device simultaneously for keyboard and mouse, if the internal resistance of keyboard is converted to a fixed value resistance by internal resistance change-over circuit and the internal resistance of mouse is converted to another fixed value resistance, so the processing module 4 of this device Intelligent Recognition can also go out that keyboard is stolen or mouse is stolen.
As shown in Figure 9, the direct metering circuit of above-mentioned internal resistance comprises internal resistance measurement circuit 17, and this internal resistance measurement circuit 17 can be ohmmeter, power lead two ends or the data line two ends internal resistance directly can measuring keyboard or mouse 1 in parallel of ohmmeter and keyboard or mouse 1.In addition, according to the demand of practical application request, Functional Design and the difference of Production requirement, this internal resistance change detection module 3 can also be the circuit and/or other change-over circuits that comprise other measuring resistances.
As shown in Figure 10, the present embodiment additionally provides the theft preventing method of a kind of keyboard or mouse, comprises the following steps:
S1: when keyboard or mouse 1 are in energising duty, detect the change of its working current;
S2: when keyboard or mouse 1 are in off-position, detect the change of its internal resistance, particularly, detection keyboard or mouse 1 internal resistance are specially and detect its internal resistance of source or data line internal resistance;
S3: receive the change information of working current detecting and obtain and/or the change information of internal resistance respectively, namely, when keyboard or mouse 1 are in energising duty, the change information of the working current that received current change detection module 2 exports, then receives the change information of the internal resistance that internal resistance change detection module 3 exports when keyboard or mouse 1 are in off-position;
S4: the change according to working current or internal resistance determines whether to report to the police.
Above-mentioned theft preventing method is not only applicable to keyboard, and antitheft to be also applicable to mouse antitheft simultaneously, and when keyboard and mouse 1 are energized work and power-off time can realize fully-automatic intelligent anti-thefting monitoring.In addition, except non-keyboard or mouse 1 are pulled out, otherwise generally can not there is false alarm in this theft preventing method.
Preferably, above-mentioned warning comprises that sound and light alarm and message notice and warning message are long-range to be transmitted again.Namely sound and light alarm carries out auditory tone cues by loudspeaker, sound equipment or hummer etc., carries out light prompting by LED etc.Namely warning message is sent to the mobile phone of specifying by message notice by wireless communication signals.Warning message is long-range transmits the receiving end namely by wired or wireless network, warning message being transferred to farther place again.Above-mentioned warning also can only include wherein one or both.By the warning of various mode, keyboard or the stolen of mouse 1 are notified managerial personnel or monitor staff, in time to recover loss.
Particularly, as shown in figure 11, in above-mentioned steps S1 when keyboard or mouse 1 are in energising duty, the step detecting the change of its working current comprises:
S11: convert the change of working current to change in voltage, and measure this voltage to obtain the change of working current;
S12: the change change of working current being converted to connecting and disconnecting of the circuit state, and detect this connecting and disconnecting of the circuit state to obtain the change of working current;
S13: the change change of working current being converted to resistance, and measure this resistance to obtain the change of working current;
S14: the change change of working current being converted to another kind of electric current, and measure this electric current to obtain the change of working current;
S15: directly surveying work electric current is to obtain its change.
Above-mentioned steps S1 also can only include any one step in above-mentioned steps S11, S12, S13, S14 and S15 or two steps or three steps or four steps.
The above-mentioned work by keyboard or mouse 1 changes the change being converted to other signals, and the change of the working current of keyboard or mouse 1 is judged by the change detecting converted signals, the working current of keyboard or mouse 1 can be prevented because causing the situation of false alarm when the other reasons except stolen changes.Also can prevent because of keyboard or the instability of mouse 1 operating circuit itself and the situation of faiture alarm testing circuit.
Particularly, in above-mentioned steps S2 when keyboard or mouse 1 are in off-position, the step detecting the change of its internal resistance can only include: the change change of internal resistance being converted to another kind of resistance, and measures this resistance to obtain the change of internal resistance.This step can prevent the internal resistance of keyboard or mouse 1 because of when the other reasons outside stolen changes and the situation causing false alarm to occur, and also can prevent because of keyboard or the instability of mouse 1 operating circuit itself and the situation of faiture alarm testing circuit.Above-mentioned steps S2 also can only include: directly measure internal resistance to obtain its change.The Method and circuits of direct measurement internal resistance is all simple.In addition, above-mentioned steps S2 can also comprise simultaneously: the change of internal resistance converted to the change of another kind of resistance and measure this resistance and change this step to obtain it and change this step and directly measure internal resistance to obtain it.To improve the fiduciary level that internal resistance change detects.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (11)
1., for an anti-theft device for keyboard or mouse, it is characterized in that, comprising:
Curent change detection module (2), when keyboard or mouse (1) are in energising duty, for detecting the change of its working current;
Internal resistance change detection module (3), when described keyboard or mouse (1) are in off-position, for detecting the change of its internal resistance;
Processing module (4), receive the change information of the internal resistance that the change information of the working current that described curent change detection module (2) exports and/or described internal resistance change detection module (3) export, and according to the change of described working current or the change output alarm control signal of described internal resistance;
Alarm module (5), receives the alarm control signal that described processing module (4) exports, and reports to the police according to this alarm control signal.
2. as claimed in claim 1 for the anti-theft device of keyboard or mouse, it is characterized in that, described curent change detection module (2) and/or described internal resistance change detection module (3) are connected with described processing module (4) respectively by wire transmission module and/or wireless transport module, or are directly electrically connected by the circuit on printed circuit board (PCB) and described processing module (4).
3. as claimed in claim 1 or 2 for the anti-theft device of keyboard or mouse, it is characterized in that, described alarm module (5) comprises audible alarm unit and/or light alarm unit and/or information notification unit and/or the long-range transmission unit again of warning message.
4., as claimed in claim 1 for the anti-theft device of keyboard or mouse, it is characterized in that, the keyboard that described internal resistance change detection module (3) is detected or mouse (1) internal resistance are the internal resistance of source or data line internal resistance.
5. the anti-theft device for keyboard or mouse as described in claim 1 or 2 or 4, it is characterized in that, described curent change detection module (2) comprising:
Equivalent voltage testing circuit, comprises for converting the change of the working current of described keyboard or mouse (1) to the voltage conversion circuit (7) of change in voltage and the first metering circuit (61) for measuring converted voltage; And/or,
Equivalence on off operating mode testing circuit, comprises for the change of the working current of described keyboard or mouse (1) being converted to the on off operating mode change-over circuit of connecting and disconnecting of the circuit state change and the second metering circuit (62) for detecting the rear connecting and disconnecting of the circuit state of conversion; And/or,
Equivalent resistance testing circuit, comprises for the change of the working current of described keyboard or mouse (1) being converted to the resistance change-over circuit of resistance change and the 3rd metering circuit (63) for measuring the rear resistance of conversion; And/or,
Equivalent current testing circuit, comprises for converting the change of the working current of described keyboard or mouse (1) to the current converter circuit of another kind of curent change and the 4th metering circuit (64) for measuring conversion after-current; And/or,
Direct-detection current circuit, is connected on the operating circuit of described keyboard or mouse (1), for directly measuring the working current of described keyboard or mouse (1).
6., as claimed in claim 5 for the anti-theft device of keyboard or mouse, it is characterized in that:
Described voltage conversion circuit (7) is connected on the operating circuit of described keyboard or mouse (1), and described first metering circuit (61) is in parallel with described voltage conversion circuit (7).
7., as claimed in claim 5 for the anti-theft device of keyboard or mouse, it is characterized in that:
Described on off operating mode change-over circuit comprises the first gate-controlled switch circuit (9) and the first resistance (8), described first gate-controlled switch circuit (9) comprises the first on-off circuit and the first control circuit for controlling described first on-off circuit break-make, described first control circuit is connected on the operating circuit of described keyboard or mouse (1), ground connection after one termination supply voltage of described first resistance (8), the other end and described first switching circuit in series, described first on-off circuit is in parallel with described second metering circuit (62).
8., as claimed in claim 5 for the anti-theft device of keyboard or mouse, it is characterized in that:
Described resistance change-over circuit comprises the second gate-controlled switch circuit (11) and the second resistance (10), described second gate-controlled switch circuit (11) comprises second switch circuit and the second control circuit for controlling described second switch circuit, described second control circuit is connected on the operating circuit of described keyboard or mouse (1), and described second resistance (10), described second switch circuit and described 3rd metering circuit (63) are connected in series.
9., as claimed in claim 5 for the anti-theft device of keyboard or mouse, it is characterized in that:
Described current converter circuit comprises the 3rd gate-controlled switch circuit (13) and the 3rd resistance (12), described 3rd gate-controlled switch circuit (13) comprises the 3rd on-off circuit and the 3rd control circuit for controlling described 3rd on-off circuit, described 3rd control circuit is connected on the operating circuit of described keyboard or mouse (1), one termination power supply of described 3rd resistance (12), the other end and described 3rd on-off circuit, described 4th metering circuit (64) are connected in series rear ground connection.
10. the anti-theft device for keyboard or mouse as described in claim 1 or 2 or 4 or 6 or 7 or 8 or 9, it is characterized in that, described internal resistance change detection module (3) comprising:
Equivalent internal resistance testing circuit, the resistance measuring circuit (16) comprising internal resistance change-over circuit and connect with described internal resistance change-over circuit, described internal resistance change-over circuit is used for the internal resistance of described keyboard or mouse (1) to change the change being converted to another kind of resistance; And/or,
The direct metering circuit of internal resistance, for directly measuring the internal resistance of described keyboard or mouse (1) to obtain its change.
11. as claimed in claim 10 for the anti-theft device of keyboard or mouse, it is characterized in that, described internal resistance change-over circuit comprises the 4th resistance (14) and the 4th gate-controlled switch circuit (15), the first end of described 4th resistance (14) is connected with the first end of described 4th gate-controlled switch circuit (15), second end of described 4th resistance (14), the described control end of the 4th gate-controlled switch circuit (15) and the power end of described keyboard or mouse (1), earth terminal, correction data end is connected respectively with two in negative data end, one end of described resistance measuring circuit (16) is connected with the second end of described 4th resistance (14), the other end is connected with the second end of described 4th gate-controlled switch (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520427549.9U CN204719903U (en) | 2015-06-19 | 2015-06-19 | For the anti-theft device of keyboard or mouse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520427549.9U CN204719903U (en) | 2015-06-19 | 2015-06-19 | For the anti-theft device of keyboard or mouse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204719903U true CN204719903U (en) | 2015-10-21 |
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ID=54318879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520427549.9U Expired - Fee Related CN204719903U (en) | 2015-06-19 | 2015-06-19 | For the anti-theft device of keyboard or mouse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204719903U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983997A (en) * | 2017-06-02 | 2018-12-11 | 原相科技股份有限公司 | Trigger circuit, the equipment with multiple triggers and mouse |
-
2015
- 2015-06-19 CN CN201520427549.9U patent/CN204719903U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983997A (en) * | 2017-06-02 | 2018-12-11 | 原相科技股份有限公司 | Trigger circuit, the equipment with multiple triggers and mouse |
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