CN111796545B - Anti-shock false-triggering safety mechanism system - Google Patents
Anti-shock false-triggering safety mechanism system Download PDFInfo
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- CN111796545B CN111796545B CN202010699318.9A CN202010699318A CN111796545B CN 111796545 B CN111796545 B CN 111796545B CN 202010699318 A CN202010699318 A CN 202010699318A CN 111796545 B CN111796545 B CN 111796545B
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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Abstract
A safety mechanism system for preventing shock and false triggering is characterized in that a plurality of trigger signals sent by an MCU (microprogrammed control unit) flow back to the MCU after passing through respective responsible loops, the signals are logically interacted with a shock acquisition signal and a photosensitive signal at the same time, the interacted signals flow back to the MCU, whether the loop is attacked or false triggering caused by falling shock is determined by analyzing the states and changes of the plurality of flow-back signals and judging according to set logic, and a higher-grade and intelligent safety protection mechanism than a traditional trigger mechanism is realized.
Description
Technical Field
The invention relates to the field of circuit protection, in particular to a safety mechanism system for preventing falling, vibration and false triggering.
Background
With the continuous development of the electronic payment industry, people put forward higher demands on the safety of electronic payment terminals, and the traditional safety protection mechanisms of payment terminals such as POS machines and the like are easy to generate vibration false triggering due to the careless falling of users under the condition of no artificial attack, so that the equipment data is cleared and cannot be used.
In the traditional POS machine trigger protection mechanism, a single trigger signal is sent out by an MCU (microprogrammed control unit), and the single trigger signal returns to a chip after passing through certain loops to directly judge whether the loops are attacked or not; however, the middle protection loop is provided with the transmission of contact pressing type conductive media such as wallboards, carbon granules, zebra stripes and the like, when a user operates the equipment, the conductive media often fall off carelessly, a larger falling shock occurs at the moment of falling to the ground, the contact pressing type conductive media may have bad contact in the falling shock process, at the moment, the trigger signal of the circuit is equivalent to open circuit, the system is considered to be attacked, and a protection mechanism is triggered, and the traditional protection mechanism can cause false triggering in the careless falling process during the use of the user, so that the data of the equipment can be reset and can not be used; at the moment, the electronic payment terminal equipment is not attacked by people, and the conventional static or dynamic triggering security mechanism does not fully consider the common falling problem in the using process of a user, so that the identification degree of the security level is very low, and the requirement of the security level of the developing electronic payment terminal equipment is difficult to meet.
Disclosure of Invention
The invention aims to provide a safety mechanism system for preventing falling, vibration and false triggering, thereby solving the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a safety mechanism system for preventing falling, vibration and false triggering comprises an MCU main control module, a protection loop, a signal comprehensive processing module, a vibration sensing module and a photosensitive sensing module;
the MCU main control module sends a trigger signal, the trigger signal passes through the protection loop, then is input into the signal comprehensive processing module, and the trigger signal passing through the protection loop flows back to the MCU main control module;
the signal comprehensive processing module receives the trigger signal passing through the protection loop and a photosensitive signal sent by the photosensitive induction module; performing logic operation on the trigger signal passing through the protection loop to form a logic signal GPIO1 to be transmitted into the MCU main control module; performing logic operation on the photosensitive signal to form a logic signal GPIO2 to be transmitted into the MCU main control module;
the vibration sensing module sends out a vibration judgment signal DO to be transmitted into the MCU main control module;
the MCU main control module detects the logic signal GPIO1, the logic signal GPIO2 and the vibration judgment signal DO, and judges the state of equipment and corresponding response action.
Preferably, the trigger signal sent by the MCU master control module includes four trigger signals, and when one of the trigger signals is open-circuited, the trigger signal changes to a low level; when the open circuit does not occur, the trigger signal is high level.
Preferably, the signal comprehensive processing module is a logic operator, and outputs a logic signal by performing logic operation on an input signal.
Preferably, the vibration sensing module is provided with a threshold, and when the vibration sensing module senses that vibration occurs, the vibration judging signal DO is sent to be at a high level; otherwise, it is low.
Preferably, the photosensitive sensing module is installed inside the device, and when sensing light, the emitted photosensitive signal is at a high level, otherwise, the photosensitive signal is at a low level.
The invention has the beneficial effects that: the invention discloses a safety mechanism system for preventing falling and shock false triggering, which avoids false triggering caused by that a user carelessly falls equipment under the condition of ensuring the safety of a triggering mechanism by comprehensively analyzing a shock signal and a triggering flow-back signal, and realizes a higher-level triggering safety protection mechanism; in addition, a photoresistor loop of the anti-disassembly machine is led into a logic interaction mechanism, and a vibration signal is matched to ensure that the safety loophole caused by the problem of false triggering is improved, so that a more practical and effective triggering safety protection mechanism is realized.
Drawings
FIG. 1 is a schematic diagram of a system for preventing false triggering due to shock
FIG. 2 is a schematic diagram of the input and output of the MCU master control module;
FIG. 3 is a schematic diagram of a guard circuit;
FIG. 4 is a schematic diagram of a signal synthesis processing module;
FIG. 5 is a schematic diagram of a photosensitive sensor module;
FIG. 6 is a schematic view of a shock sensing module;
FIG. 7 is a logic table of the MCU master control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
A safety mechanism system for preventing falling, vibration and false triggering is shown in figure 1 and comprises an MCU main control module, a protection loop, a signal comprehensive processing module, a vibration sensing module and a photosensitive sensing module;
the MCU main control module sends a trigger signal, receives a trigger backflow signal and a signal subjected to logic operation, detects, and determines the state of equipment and required corresponding actions according to a detection structure; the protection circuit comprises circuits such as a MESH layer protection circuit, a wallboard protection circuit, a PCB layer protection circuit and the like; the signal comprehensive processing module is a logic arithmetic unit, performs corresponding logic operation on input signals, and transmits the logic signals subjected to the logic operation to the MCU main control module; the vibration sensing module is used for detecting whether the equipment has the conditions of falling vibration and the like, a vibration threshold value is arranged in the vibration sensing module, when the conditions of falling vibration and the like occur, the vibration threshold value is exceeded, the output vibration judgment signal is at a high level, otherwise, the output vibration judgment signal is at a low level; the photosensitive induction module is installed inside the equipment, and under the normal condition, light can not be induced, and the photosensitive signal that sends this moment is the low level, when involving circumstances such as tear open, photosensitive induction module senses light, sends photosensitive signal is the high level.
The MCU main control module sends a trigger signal, the trigger signal passes through the protection loop, then is input into the signal comprehensive processing module, and the trigger signal passing through the protection loop flows back to the MCU main control module; the signal comprehensive processing module receives the trigger signal passing through the protection loop and a photosensitive signal sent by the photosensitive induction module; performing logic operation on the trigger signal passing through the protection loop, and transmitting a formed logic signal GPIO1 into the MCU main control module; carrying out logic operation on the photosensitive signals, and transmitting formed logic signals GPIO2 into the MCU main control module; the vibration sensing module sends out a vibration judgment signal DO which is transmitted into the MCU main control module through a GPIO3 interface; the MCU main control module detects the GPIO1 signal, the GPIO2 signal and the DO signal, judges the state of the equipment and responds correspondingly.
In the embodiment, the MCU master control module is used to send four trigger signals, the principle of the MCU master chip is shown in fig. 2, TEMPER _ I1/I2/I3/I4 is an output trigger signal, TEMPER _ O1/O2/O3/O4 is an input trigger signal flowing back through the protection loop, GPIO1/GPIO2 is an input logic signal output by the signal comprehensive processing module, and GPIO3/DO is an input vibration determination signal output by the vibration sensing module; the guard loop signal flow is shown in fig. 3; the signal comprehensive processing module adopts a double four-way AND gate chip 74HC21 to complete the logical operation of signals, the chip interface 74HC21 is shown in FIG. 4, and LO1/LO2/LO3 are input photosensitive signals output by the photosensitive sensing module; the principle of the photosensitive sensing module is shown in fig. 5, and the vibration sensing module adopts SW-420 as shown in fig. 6.
When a user carelessly drops the equipment, the caused vibration impact frequency is 1-3 times through experimental test detection, the time for causing the trigger circuit to be broken in the embodiment is less than 100ms to indicate that the equipment is broken due to dropping, the impact vibration value of the equipment falling from a high position of a human body is set as a threshold value of the vibration sensing module SW-420, when the equipment falls, the vibration sensing module can output a high level, and the alarm response time is set to be 500 ms.
The working principle of the embodiment is as follows: the MCU master chip sends out four paths of trigger signals TEMPER _ I1/I2/I3/I4, the four paths of trigger signals flow back to the MCU master chip after passing through the protection circuit and are transmitted into a four-path AND gate chip 74HC21 of the signal comprehensive processing module, and the three paths of photosensitive signals LO1/LO2/LO3 and one path of high-level signals are transmitted into the four-path AND gate chip 74HC21 of the signal comprehensive processing module; in the four-way AND gate chip, four trigger signals TEMPER _ O1/O2/O3/O4 passing through the protection loop are subjected to AND logic operation, CPIO1 logic signals are output, and three photosensitive signals LO1/LO2/LO3 and one high-level signal are subjected to AND logic operation, and CPIO2 logic signals are output; then, transmitting logic signals CPIO1 and GPIO2 output by the signal comprehensive processing module and the vibration judgment signal DO signal output by the vibration sensing module to the MCU main chip together; finally, the MCU main chip analyzes and judges the inputted GPIO1, GPIO2, and GPIO3 signals, the logic table of the MCU main chip for analyzing and judging the signals is shown in fig. 7, and the specific logic process of analyzing and judging is as follows:
under the normal state, the trigger signal TEMPER _ I1/I2/I3/I4 is at high level, the photosensitive signal LO1/LO2/LO3 is at low level, and the vibration judging signal DO is at low level; at the moment, the logic signal GPIO1 is at a high level, and the GPIO2 and the GPIO3 are at a low level;
when falling to cause vibration, the device comprises two states, namely a first state: when the trigger circuit is broken due to vibration, the trigger signal is at a low level through GPIO1 output by AND logic operation, the photosensitive signal is still at a low level, GPIO2 output by AND logic operation is at a low level, the vibration judgment signal DO is at a high level, a wave trough with the breaking time of less than 100m for 1-3 times exists, and the MCU main chip does not execute the trigger operation in the state; in the second state: when the trigger circuit is not broken by vibration, the logic signal GPIO1 is at a high level, the logic signal GPIO2 is at a low level, the vibration judgment signal DO is at a high level, and the MCU main chip does not execute the trigger operation in the state;
two states are included when no fall occurs, the third state: the device vibration is not caused, the logic signal GPIO1 is at a high level, the logic signal GPIO2 is at a low level, the vibration judgment signal DO is at a low level, and the MCU main chip can execute triggering operation in the state; the fourth state: when the equipment vibrates due to reasons such as disassembly and the like but the trigger loop is not broken, the logic signal GPIO1 is at a high level, the photosensitive sensing module senses light, the photosensitive signal is at a high level, GPIO2 output by AND logic operation is at a high level, and the vibration judgment signal DO is at a high level. The MCU main chip can execute triggering operation in the state;
in addition, when the machine is not dismounted and the machine is not dropped, vibration may be caused, at this time, the logic signal GPIO1 is at a high level, the logic signal GPIO2 is at a low level, and the vibration determination signal DO is at a high level, but because vibration exceeding a threshold value generally exists only 1 to two times when the machine is dropped, when in this state, the MCU main chip detects that there are more than 3 peaks in the high level of the vibration determination signal DO, the MCU main chip still determines that an attack is made, so that a trigger operation can still be performed.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:
the invention discloses a safety mechanism system for preventing falling and shock false triggering, which avoids false triggering caused by that a user carelessly falls equipment under the condition of ensuring the safety of a triggering mechanism by comprehensively analyzing a shock signal and a triggering flow-back signal, and realizes a higher-level triggering safety protection mechanism; in addition, a photoresistor loop of the anti-disassembly machine is led into a logic interaction mechanism, and a vibration signal is matched to ensure that the safety loophole caused by the problem of false triggering is improved, so that a more practical and effective triggering safety protection mechanism is realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (5)
1. A safety mechanism system for preventing falling, vibration and false triggering is characterized by comprising an MCU main control module, a protection loop, a signal comprehensive processing module, a vibration sensing module and a photosensitive sensing module;
the MCU main control module sends a trigger signal, the trigger signal passes through the protection loop, then is input into the signal comprehensive processing module, and the trigger signal passing through the protection loop flows back to the MCU main control module;
the signal comprehensive processing module receives the trigger signal passing through the protection loop and a photosensitive signal sent by the photosensitive induction module; performing logic operation on the trigger signal passing through the protection loop to form a logic signal GPIO1 to be transmitted into the MCU main control module; performing logic operation on the photosensitive signal to form a logic signal GPIO2 to be transmitted into the MCU main control module;
the vibration sensing module sends out a vibration judgment signal DO to be transmitted into the MCU main control module;
the MCU main control module detects the logic signal GPIO1, the logic signal GPIO2 and the vibration judgment signal DO, and judges the state of equipment and corresponding response action;
in a normal state, the logic signal GPIO1 is at a high level, and the logic signal GPIO2 and the vibration determination signal DO are at a low level; the logic of the MCU main control module for analyzing and judging the logic signal GPIO1, the logic signal GPIO2 and the vibration judging signal DO is as follows:
when the trigger circuit is broken due to vibration, the trigger signal is at a low level through GPIO1 output by AND logic operation, the photosensitive signal is still at a low level, GPIO2 output by AND logic operation is at a low level, the vibration judgment signal DO is at a high level, a wave trough with the breaking time of less than 100m exists for 1-3 times, and the MCU main control module does not execute the trigger operation in the state; when the trigger loop is not broken by vibration, the logic signal GPIO1 is at a high level, the logic signal GPIO2 is at a low level, the vibration judgment signal DO is at a high level, and the MCU main control module does not execute a trigger operation in the state;
when the photosensitive sensing module senses light and the equipment vibrates but the triggering loop is not broken, the logic signal GPIO1 is at a high level, the logic signal GPIO2 is at a high level, the vibration judgment signal DO is at a high level, and the MCU main control module executes triggering operation in the state;
when the photosensitive sensing module does not sense light, the equipment vibrates and the open circuit of the trigger loop is not caused, the logic signal GPIO1 is at a high level, the logic signal GPIO2 is at a low level, the vibration judgment signal DO is at a high level, but when the MCU main control module detects that more than 3 wave peaks exist in the high level of the vibration judgment signal DO, the MCU main control module judges that the attack is artificial, and executes the trigger operation.
2. The system according to claim 1, wherein the trigger signal sent by the MCU master control module comprises four trigger signals, and when one of the trigger signals is open, the trigger signal changes to low level; when the open circuit does not occur, the trigger signal is high level.
3. The system according to claim 1, wherein the signal processing module is a logic operator, and outputs a logic signal by performing a logic operation on the input signal.
4. The system according to claim 1, wherein the vibration sensing module is configured with a threshold, and when the vibration sensing module senses a vibration, the vibration determining signal DO is at a high level; otherwise, it is low.
5. The system according to claim 1, wherein the light-sensitive sensing module is installed inside the device, and when sensing light, the light-sensitive signal is at a high level, otherwise, the light-sensitive signal is at a low level.
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| CN112861124B (en) * | 2021-02-01 | 2024-07-09 | 中国银联股份有限公司 | Anti-intrusion detection method and device for terminal |
| CN113689635B (en) * | 2021-07-15 | 2023-05-12 | 北京中电华大电子设计有限责任公司 | Anti-disassembly circuit structure and method for preventing false triggering |
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