CN203479921U - Real-time monitoring device and system for electrostatic wristband - Google Patents
Real-time monitoring device and system for electrostatic wristband Download PDFInfo
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- CN203479921U CN203479921U CN201320343752.9U CN201320343752U CN203479921U CN 203479921 U CN203479921 U CN 203479921U CN 201320343752 U CN201320343752 U CN 201320343752U CN 203479921 U CN203479921 U CN 203479921U
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Abstract
The utility model discloses a static bracelet real time monitoring device and system. The device comprises an oscillation comparator, a voltage comparator and a processor; the first input end of the oscillation comparator is connected with the electrostatic wristband, the second input end of the oscillation comparator is connected with the ground, the output end of the oscillation comparator is connected with the positive input end of the voltage comparator, the negative input end of the voltage comparator is connected with the reference voltage, and the output end of the voltage comparator is connected with the processor; the system comprises a monitoring switchboard, a communication module and at least one static bracelet real-time monitoring device. The utility model discloses under the normal/unusual two kinds of circumstances of static bracelet work, through oscillation comparator and voltage comparator to the different levels of treater output, whether the treater judges static bracelet according to this level and normally works to in time discover the unusual static bracelet of work, avoided electronic components electrostatic damage, carry out unified management to a plurality of static bracelet real time monitoring devices through the control switchboard simultaneously.
Description
Technical Field
The utility model relates to an electrostatic protection technical field especially relates to an static bracelet real time monitoring device and system.
Background
In the electronic industry, most of the electronic components are static electricity sensitive devices (e.g., Integrated Circuits (ICs)). One of the sources of electrostatic interference is friction between people and objects such as floors, clothing, etc. If several kilovolts of static electricity generated by friction are transmitted to the static electricity sensitive element, the static electricity damage of the element is inevitably caused. In order to avoid this phenomenon, it is required to wear the electrostatic hand ring when entering the region where the electrostatic sensing element is disposed, and a static discharge channel is established between the human body and the ground through the electrostatic hand ring, thereby preventing static electricity from being transmitted to the electrostatic sensing element.
However, the static bracelet wearing personnel inevitably bends, twines the static bracelet in production operation process etc. and moves, causes the static bracelet fracture or with wearing personnel skin contact failure, leads to the static passageway of releasing to be obstructed, and the static that the human body produced can not release to the ground. Therefore, even if the relevant person wears the electrostatic bracelet, the electrostatic damage of the relevant electronic component is also hidden.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims to provide an electrostatic bracelet real time monitoring device and system to avoid causing electronic components electrostatic damage because of electrostatic bracelet fracture or contact failure.
In order to achieve the above object, the utility model provides a following technical scheme:
an electrostatic wristband real-time monitoring device, comprising: an oscillation comparator, a voltage comparator and a processor;
the first input end of the oscillation comparator is connected with the electrostatic wristband, the second input end of the oscillation comparator is connected with the ground, the output end of the oscillation comparator is connected with the positive input end of the voltage comparator, the negative input end of the voltage comparator is connected with the reference voltage, and the output end of the voltage comparator is connected with the processor.
Preferably, the real-time monitoring device for the electrostatic bracelet further comprises a first voltage-dividing resistor and a second voltage-dividing resistor; two ends of the first voltage-dividing resistor are respectively connected with one end of the second voltage-dividing resistor and a power supply; the other end of the second voltage-dividing resistor is grounded; and the voltage at the common end of the first voltage-dividing resistor and the second voltage-dividing resistor is used as the reference voltage.
Preferably, the real-time monitoring device for the electrostatic wristband further comprises a voltage stabilizing capacitor; the voltage stabilizing capacitor is connected with the second voltage dividing resistor in parallel.
Preferably, the oscillation comparator includes a first amplifier, a first oscillation resistor, a second oscillation resistor, a third oscillation resistor, a fourth oscillation resistor, a fifth oscillation resistor, a sixth oscillation resistor, a variable resistor, a first oscillation capacitor, a second oscillation capacitor, and a third oscillation capacitor; wherein,
the positive end of the first amplifier is respectively connected with one end of the first oscillating resistor and one end of the second oscillating resistor; the other end of the first oscillating resistor is connected to the ground; the other end of the second oscillating resistor is connected to the electrostatic wristband; two ends of the third oscillating resistor are respectively connected to the electrostatic wristband and the output end of the first amplifier; two ends of the fourth oscillating resistor are respectively connected with the inverting end of the first amplifier and the output end of the first amplifier;
a series circuit formed by the first oscillating capacitor and the second oscillating capacitor is connected with the fourth oscillating resistor in parallel; the common end of the first oscillating capacitor and the second oscillating capacitor is connected with the reference voltage through a series circuit formed by the fifth oscillating resistor and the variable resistor; the sixth oscillating resistor is connected in parallel with the variable resistor.
Preferably, the voltage comparator comprises a second amplifier, a first comparison resistor, a second comparison resistor, a comparison capacitor and a diode; wherein,
the cathode of the diode is connected to the output end of the first amplifier, and the anode of the diode is connected to the forward end of the second amplifier through the first comparison resistor; the positive end of the second amplifier is connected with the power supply through the second comparison resistor, and the comparison capacitor is connected with the second comparison resistor in parallel;
the inverting end of the second amplifier is used as the negative input end of the voltage comparator; and the output end of the second amplifier is used as the output end of the voltage comparator.
Preferably, the processor comprises a single chip microcomputer and a crystal oscillator connected with the single chip microcomputer; and the input end of the singlechip is connected with the output end of the voltage comparator.
Preferably, the real-time monitoring of the electrostatic bracelet further comprises an alarm unit; the alarm unit comprises a bicolor light-emitting diode and/or a buzzer; the alarm unit also comprises a driving module, and the input end of the driving module is connected with the output end of the processor; wherein,
when the alarm unit comprises the bicolor light-emitting diode, the first output end of the driving module is connected with the cathode of the bicolor light-emitting diode; the anode of the double-color light-emitting diode is connected with a power supply through a current-limiting resistor;
when the alarm unit comprises the buzzer, the second output end of the driving module is connected with the negative electrode of the buzzer; and the positive electrode of the buzzer is connected with a power supply.
Preferably, the real-time monitoring of the electrostatic wristband further comprises a storage module connected with the processor; the memory module includes a memory chip.
A real-time monitoring system for an electrostatic bracelet comprises a monitoring switchboard, a communication module and at least one real-time monitoring device for any one of the electrostatic bracelets;
the real-time monitoring device of the electrostatic bracelet is connected with the monitoring switchboard through the communication module.
Preferably, the communication module comprises an RS485 communication chip; the monitoring switchboard is connected with the network server through the protocol conversion module; the protocol conversion module comprises an RS485 and TCP/IP protocol conversion module.
According to the above technical scheme, the utility model provides an whether static bracelet real time monitoring device includes oscillation comparator, voltage comparator and treater, under the normal/unusual two kinds of circumstances of static bracelet work, exports different levels to the treater through oscillation comparator and voltage comparator, and whether the treater can judge static bracelet normally work according to this level. Therefore, the utility model discloses can in time discover the unusual static bracelet of work, be convenient for in time take corresponding counter-measure, avoid because of static bracelet fracture or contact failure cause electronic components electrostatic damage, solve prior art's problem.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a real-time monitoring device for an electrostatic bracelet according to a first embodiment of the present invention;
fig. 2(a) is a structural diagram of a real-time monitoring device for an electrostatic bracelet according to a second embodiment of the present invention;
fig. 2(b) is a structural diagram of another real-time monitoring device for an electrostatic bracelet according to a second embodiment of the present invention;
fig. 3 is a structural diagram of a real-time monitoring device for an electrostatic bracelet according to a third embodiment of the present invention;
fig. 4 is a structural diagram of a real-time monitoring system for an electrostatic bracelet according to a fourth embodiment of the present invention;
fig. 5 is a structural diagram of a real-time monitoring system for an electrostatic bracelet according to a fifth embodiment of the present invention;
fig. 6 is a circuit structure diagram of the communication module and the processor in the real-time monitoring system for electrostatic wristband provided by the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the utility model discloses static bracelet real time monitoring device and system to avoid causing electronic components electrostatic damage because of static bracelet fracture or contact failure.
Referring to fig. 1, a first embodiment of the present invention provides an electrostatic bracelet real-time monitoring apparatus, including an oscillation comparator 101, a voltage comparator 102 and a processor 103.
Wherein, the first input end of the oscillation comparator 101 is connected with the electrostatic bracelet, the second input end of the oscillation comparator 101 is connected with the ground, the output end of the oscillation comparator 101 is connected with the positive input end of the voltage comparator 102, the negative input end of the voltage comparator 102 is connected with the reference voltage VrefThe output of the voltage comparator 102 is connected to the processor 103.
The working process of the static bracelet real-time monitoring device is as follows:
when the electrostatic bracelet works normally (the leakage path between the electrostatic bracelet and the ground is smooth), the potential of the first input end of the oscillation comparator 101 is higher than the potential of the second input end of the oscillation comparator 101, and the output end of the oscillation comparator 101 outputs a high level to the positive input end of the voltage comparator 102; since the high level is higher than the reference voltage VrefTherefore, the output terminal of the voltage comparator 102 outputs a high level to the processor 103.
When the electrostatic bracelet works abnormally (the leakage path is blocked due to factors such as breakage of the electrostatic bracelet and poor contact with a human body), no input signal is input at the positive input end of the oscillation comparator 101, and a sine wave is output from the output end of the oscillation comparator 101 to the positive input end of the voltage comparator 102; in the negative half cycle of the sine wave, the positive input terminal of the voltage comparator 102 is lower than the reference voltage V of the negative input terminalrefSo that the output terminal of the voltage comparator 102 facesThe processor 103 outputs a low level.
The processor judges whether the electrostatic bracelet normally works according to the output level of the voltage comparator 102: when the output level of the voltage comparator 102 is high, the electrostatic wristband works normally; when the output of the voltage comparator 102 is low, the electrostatic wristband works abnormally.
According to the above structure and working process, the embodiment of the utility model provides an electrostatic hand ring real-time monitoring device includes oscillation comparator, voltage comparator and treater, under the normal/unusual two kinds of circumstances of electrostatic hand ring work, through oscillation comparator and voltage comparator to treater output different levels, whether the treater can judge electrostatic hand ring normal work according to this level. Therefore, the embodiment of the utility model provides a can in time discover the unusual static bracelet of work, be convenient for in time take corresponding counter-measure, avoided because of static bracelet fracture or contact failure cause electronic components electrostatic damage, solved prior art's problem.
Referring to fig. 2(a), a second embodiment of the present invention provides another real-time monitoring device for an electrostatic bracelet, including an oscillation comparator 201, a voltage comparator 202, a processor 203, a first voltage-dividing resistor R01, and a second voltage-dividing resistor R02.
Wherein, two ends of the first voltage dividing resistor R01 are respectively connected to one end of the second voltage dividing resistor R02 and the power source VCC (voltage V of the general power source VCC)0= 5V); the other end of the second voltage-dividing resistor R02 is grounded; the common terminal of the first voltage-dividing resistor R01 and the second voltage-dividing resistor R02 is used as a reference voltage VrefI.e. Vref=V0*R02/(R01+R02)。
The oscillation comparator 201 includes a first amplifier B, a first oscillation resistor R11, a second oscillation resistor R12, a third oscillation resistor R13, a fourth oscillation resistor R14, a fifth oscillation resistor R15, a sixth oscillation resistor R16, a variable resistor VR1, a first oscillation capacitor C11, and a second oscillation capacitor C12.
The positive terminals of the first amplifier B and one end of the first oscillating resistor R11Is connected to one end of a second oscillation resistor R12; the other end of the first oscillating resistor R11 is connected to the ground; the other end of the second oscillating resistor R12 is connected with the electrostatic wristband; two ends of the third oscillating resistor are respectively connected to the electrostatic wristband and the output end of the first amplifier B; and two ends of the fourth oscillating resistor are respectively connected with the inverting end of the first amplifier B and the output end of the first amplifier B. A series circuit formed by the first oscillating capacitor C11 and the second oscillating capacitor C12 is connected with the fourth oscillating resistor R14 in parallel; the common end of the first oscillating capacitor C11 and the second oscillating capacitor C12 is connected with a reference voltage V through a series circuit consisting of a fifth oscillating resistor R15 and a variable resistor VR1ref(that is, the fifth oscillation resistor R15 and the variable resistor VR1 are connected in series between the common terminal of the first oscillation capacitor C11 and the second oscillation capacitor C12 and the common terminal of the first voltage-dividing resistor R01 and the second voltage-dividing resistor R02); the sixth oscillating resistor R16 is connected in parallel with the variable resistor VR 1. The first oscillation capacitor C11 and the second oscillation capacitor C12 are used for adjusting the comparison accuracy of the oscillation comparator 201; the sixth oscillating resistor R16 and the variable resistor VR1 are used for adjusting the stability of the oscillating comparator 201, and the parallel connection of the sixth oscillating resistor R16 and the variable resistor VR1 can avoid the influence of the drift of the variable resistor VR1 on the stability of the oscillating comparator 201.
The voltage comparator 202 includes a second amplifier a, a first comparison resistor R21, a second comparison resistor R22, a comparison capacitor C21, and a diode D21.
The cathode of the diode D21 is connected to the output end of the first amplifier B, and the anode of the diode D21 is connected to the positive end of the second amplifier A through the first comparison resistor R21; the forward terminal of the second amplifier a is connected to a power supply (with a voltage of typically 5V) through a second comparison resistor R22, and a comparison capacitor C21 is connected in parallel with the second comparison resistor R22. The inverting terminal of the second amplifier a is connected as the negative input terminal of the voltage comparator 202 to the common terminal of the first voltage-dividing resistor R01 and the second voltage-dividing resistor R02. The output of the second amplifier a is connected to the processor 203 as the output of the voltage comparator 202. In addition, to reduce circuit impact, a resistor R203 may be connected in series between the output of the second amplifier a and the processor 203.
The working process of the static bracelet real-time monitoring device is as follows:
when the electrostatic bracelet works normally (the discharge path between the electrostatic bracelet and the ground is smooth), static electricity generated by a human body is discharged to the ground through the first oscillating resistor R11 and the second oscillating resistor R12; meanwhile, the electrostatic wristband is connected to the output end of the first comparator B through the third oscillating resistor R13, so that the first comparator B outputs a high level, and the diode D21 is cut off; the forward terminal voltage of the second comparator A is equal to the supply voltage V0Reverse terminal voltage is VrefAnd V isref<V0Therefore, the second comparator a outputs a high level to the processor 203.
When the electrostatic bracelet works abnormally (the leakage path is blocked due to factors such as breakage of the electrostatic bracelet and poor contact with a human body), no input signal is provided at the positive end of the first comparator B, the oscillation comparator 201 generates sinusoidal oscillation, and generated sinusoidal waves are output from the output end of the first comparator B; in the positive half cycle of the sine wave, the diode D21 is still turned off, and the second comparator a still outputs a high level to the processor 203; in the negative half cycle of the sine wave, the diode D21 is turned on, the power source VCC charges the comparison capacitor C21, and the forward voltage of the second amplifier a is lower than the reverse voltage (i.e., the reference voltage V)ref) The second amplifier a outputs a low level to the processor 203.
The high level or the low level output by the second amplifier A is the level which can be identified by the singlechip. The processor 203 judges whether the electrostatic bracelet normally works according to the received level: when the high level is continuously received, the electrostatic wristband is judged to work normally, and the electrostatic wristband is not broken and worn correctly; when the low level is received, the work of the electrostatic bracelet is judged to be abnormal, and the specific reason can be that the electrostatic bracelet is broken, is not worn or is worn wrongly.
According to the above structure and working process, the embodiment of the utility model provides a two realized the real time monitoring of static bracelet, can in time discover the unusual static bracelet of work, be convenient for in time take corresponding counter-measure, avoided because of static bracelet fracture or contact failure cause electronic components electrostatic damage, solved prior art's problem.
Further, as shown in fig. 2(b), the real-time monitoring device for an electrostatic bracelet according to the second embodiment may further include a voltage-stabilizing capacitor C03. The voltage stabilizing capacitor C03 is connected in parallel with the second voltage dividing resistor R02 and is used for stabilizing the reference voltage Vref。
As shown in fig. 3, a third embodiment of the present invention provides another real-time monitoring device for an electrostatic bracelet, including an oscillation comparator 301, a voltage comparator 302, a processor 303 and an alarm module 304. The first input end of the oscillation comparator 301 is connected with the electrostatic wristband, the second input end of the oscillation comparator 301 is connected with the ground, the output end of the oscillation comparator 301 is connected with the positive input end of the voltage comparator 302, and the negative input end of the voltage comparator 302 is connected with the reference voltage Vref。
The processor 303 is composed of a single chip microcomputer U001 and a crystal oscillator OSC 001. The singlechip U001 is powered by a low-voltage power supply. The crystal oscillator OSC001 is connected between any pair of input and output terminals (shown as an input terminal OCS1 and an output terminal OSC2 in fig. 3) of the single chip microcomputer U001, and provides a clock signal for the single chip microcomputer U001. One input end (I/O interface) of the optional singlechip U001 is connected with the output end of the voltage comparator 302.
The alarm module 304 comprises a driving module U002, a current limiting resistor R002, a bicolor light emitting diode D001 and a buzzer B001. The dual-color led D001 is composed of two common-anode leds (the two leds have different light emitting colors), cathodes of the two leds are connected to two output terminals (e.g., the second output terminal OUT2 and the third output terminal OUT3 shown in fig. 3) of the driving module U002 in a one-to-one correspondence manner, and anodes of the two leds are connected to a power supply through a current limiting resistor R002. The positive pole of the buzzer B001 is connected to the power supply, and the negative pole is connected to the output end of the driving module U002 (the output end is different from the output end connected to the light emitting diode, such as the first output end OUT1 shown in fig. 3). When the singlechip U001 judges that the work of the electrostatic wristband is abnormal according to the level signal output by the voltage comparator 302, a driving instruction is output to the driving module U002, and then the driving module U002 drives the two-color light-emitting diode D001 to emit light and the buzzer B001 to buzz and alarm.
It should be noted that the dual-color led D001 and the buzzer B001 respectively implement two different alarm modes, in practical applications, the dual-color led D001 and the buzzer B001 may be applied simultaneously to implement simultaneous sound and light alarm, or one of them may be selected, that is, only the dual-color led D001 is used to perform light alarm, or the buzzer B001 is used to perform sound alarm.
In addition, as shown in fig. 3, the real-time monitoring device for the electrostatic bracelet according to the above embodiment may further include a storage module 305 connected to the processor 303, for storing identity information of the real-time monitoring device for the electrostatic bracelet. Specifically, the memory module 305 is connected to the single chip U001, and includes a memory chip U501 and a related resistor, and the specific structure thereof is well known by those skilled in the art and will not be described in detail herein.
Corresponding with above-mentioned static bracelet real time monitoring system, the embodiment of the utility model provides a fourth still provides a static bracelet real time monitoring system. Referring to fig. 4, a block diagram of a real-time monitoring system for an electrostatic bracelet, which includes a monitoring switchboard 410, n communication modules 420 and n real-time monitoring devices 430 for the electrostatic bracelet. The communication module 420 corresponds to the real-time monitoring device 430 of the electrostatic bracelet, and the real-time monitoring device 430 of the electrostatic bracelet is connected with the monitoring switchboard 410 through the communication module 420.
Specifically, the value of n depends on actual needs, and the real-time monitoring device 430 for the electrostatic bracelet may specifically adopt the structure described in any one of the first to third embodiments. The communication module 420 can specifically adopt an RS485 communication module, and communicates with the monitoring switchboard 410 through an RS485 communication bus, so that the monitoring switchboard 410 can uniformly manage the n electrostatic wrist strap real-time monitoring devices 430.
According to the system structure, the embodiment of the utility model monitors the corresponding static bracelet in real time through the static bracelet real-time monitoring device, finds the static bracelet with abnormal work in time, and is convenient for field workers to take corresponding countermeasures in time; simultaneously, the monitoring switchboard is used for uniformly monitoring and managing a plurality of static bracelet real-time monitoring devices, so that monitoring personnel can know the state of each static bracelet in time, the electrostatic damage of electronic components caused by the breakage or poor contact of the static bracelets is avoided, and the problems of the prior art are solved.
In addition, when the real-time electrostatic bracelet monitoring device 430 is used for the first time, an external coding device is connected with the communication module 420, so that the real-time electrostatic bracelet monitoring device 430 can be initialized and coded to form a unique identification number; the monitoring switchboard 410 distinguishes and manages different real-time monitoring devices of the electrostatic wristband according to the identification number.
Further, the monitoring switchboard 410 is connected to the network server 450 through the protocol conversion module 440. Specifically, the protocol conversion module 450 may use an RS485 and TCP/IP protocol conversion module to convert the RS485 protocol data output by the monitoring switchboard 410 into the TCP/IP protocol data recognizable by the network server 450.
Referring to fig. 5, a fifth embodiment of the present invention provides another static bracelet real-time monitoring system, which includes a monitoring switchboard 510, n communication modules 520, n static bracelet real-time monitoring devices 530 and a protocol conversion module 540. The monitoring switchboard 510 communicates with the network server 560 through the protocol conversion module 550.
The real-time electrostatic bracelet monitoring device 530 has the structure described in the third embodiment, that is, the real-time electrostatic bracelet monitoring device 530 includes an oscillation comparator 531, a voltage comparator 532, a processor 533, an alarm unit 534 and a storage module 535.
As shown in fig. 6, the processor 533 is composed of a single chip microcomputer U001 and a crystal oscillator OSC 001. The communication module 520 is connected with the singlechip U001 and comprises an RS485 communication chip U301 and related resistors and capacitors. The specific structure of the communication module 520 is well known to those skilled in the art and will not be described in detail herein. When the real-time electrostatic bracelet monitoring device 530 is used for the first time, an external coding device is connected with the communication module 520, so that the real-time electrostatic bracelet monitoring device 530 can be initialized and coded to form a unique identification number, and the identification numbers of the real-time electrostatic bracelet monitoring devices 530 are stored in the storage module 535; when the real-time electrostatic bracelet monitoring device 530 is reused, the processor 533 directly reads its own identification number from the storage module 535, and is used for communication between the real-time electrostatic bracelet monitoring device 530 and the monitoring switchboard 510, and between the monitoring switchboard 510 and the network server 550.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the computer program is executed. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides an static bracelet real time monitoring device which characterized in that includes: an oscillation comparator, a voltage comparator and a processor;
the first input end of the oscillation comparator is connected with the electrostatic wristband, the second input end of the oscillation comparator is connected with the ground, the output end of the oscillation comparator is connected with the positive input end of the voltage comparator, the negative input end of the voltage comparator is connected with the reference voltage, and the output end of the voltage comparator is connected with the processor.
2. The apparatus of claim 1, further comprising a first voltage dividing resistor and a second voltage dividing resistor; two ends of the first voltage-dividing resistor are respectively connected with one end of the second voltage-dividing resistor and a power supply; the other end of the second voltage-dividing resistor is grounded; and the voltage at the common end of the first voltage-dividing resistor and the second voltage-dividing resistor is used as the reference voltage.
3. The apparatus of claim 2, further comprising a voltage stabilizing capacitor; the voltage stabilizing capacitor is connected with the second voltage dividing resistor in parallel.
4. The device according to any one of claims 1 to 3, wherein the oscillation comparator comprises a first amplifier, a first oscillation resistor, a second oscillation resistor, a third oscillation resistor, a fourth oscillation resistor, a fifth oscillation resistor, a sixth oscillation resistor, a variable resistor, a first oscillation capacitor and a second oscillation capacitor; wherein,
the positive end of the first amplifier is respectively connected with one end of the first oscillating resistor and one end of the second oscillating resistor; the other end of the first oscillating resistor is connected to the ground; the other end of the second oscillating resistor is connected to the electrostatic wristband; two ends of the third oscillating resistor are respectively connected to the electrostatic wristband and the output end of the first amplifier; two ends of the fourth oscillating resistor are respectively connected with the inverting end of the first amplifier and the output end of the first amplifier;
a series circuit formed by the first oscillating capacitor and the second oscillating capacitor is connected with the fourth oscillating resistor in parallel; the common end of the first oscillating capacitor and the second oscillating capacitor is connected with the reference voltage through a series circuit formed by the fifth oscillating resistor and the variable resistor; the sixth oscillating resistor is connected in parallel with the variable resistor.
5. The apparatus of claim 4, wherein the voltage comparator comprises a second amplifier, a first comparison resistor, a second comparison resistor, a comparison capacitor, and a diode; wherein,
the cathode of the diode is connected to the output end of the first amplifier, and the anode of the diode is connected to the forward end of the second amplifier through the first comparison resistor; the positive end of the second amplifier is connected with a power supply through the second comparison resistor, and the comparison capacitor is connected with the second comparison resistor in parallel;
the inverting end of the second amplifier is used as the negative input end of the voltage comparator; and the output end of the second amplifier is used as the output end of the voltage comparator.
6. The device of claim 1, wherein the processor comprises a single chip microcomputer and a crystal oscillator connected with the single chip microcomputer; and the input end of the singlechip is connected with the output end of the voltage comparator.
7. The device of claim 1, further comprising an alarm unit; the alarm unit comprises a bicolor light-emitting diode and/or a buzzer; the alarm unit also comprises a driving module, and the input end of the driving module is connected with the output end of the processor; wherein,
when the alarm unit comprises the bicolor light-emitting diode, the first output end of the driving module is connected with the cathode of the bicolor light-emitting diode; the anode of the double-color light-emitting diode is connected with a power supply through a current-limiting resistor;
when the alarm unit comprises the buzzer, the second output end of the driving module is connected with the negative electrode of the buzzer; and the positive electrode of the buzzer is connected with a power supply.
8. The apparatus of claim 1, further comprising a memory module coupled to the processor; the memory module includes a memory chip.
9. An electrostatic bracelet real-time monitoring system is characterized by comprising a monitoring switchboard, a communication module and at least one electrostatic bracelet real-time monitoring device according to any one of claims 1-8;
the real-time monitoring device of the electrostatic bracelet is connected with the monitoring switchboard through the communication module.
10. The system of claim 9, wherein the communication module comprises an RS485 communication chip; the monitoring switchboard is connected with the network server through the protocol conversion module; the protocol conversion module comprises an RS485 and TCP/IP protocol conversion module.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525979A (en) * | 2016-06-21 | 2017-12-29 | 纬创资通（中山）有限公司 | Detection means |
| CN108492536A (en) * | 2018-03-22 | 2018-09-04 | 杨崇凡 | A kind of electrostatic hand ring real-time monitor |
| CN109193558A (en) * | 2018-10-23 | 2019-01-11 | 珠海格力电器股份有限公司 | Electrostatic monitoring protection system |
| CN112370658A (en) * | 2020-10-23 | 2021-02-19 | 北京航星科技有限公司 | Anti-static wrist strap |
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2013
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525979A (en) * | 2016-06-21 | 2017-12-29 | 纬创资通（中山）有限公司 | Detection means |
| CN108492536A (en) * | 2018-03-22 | 2018-09-04 | 杨崇凡 | A kind of electrostatic hand ring real-time monitor |
| CN109193558A (en) * | 2018-10-23 | 2019-01-11 | 珠海格力电器股份有限公司 | Electrostatic monitoring protection system |
| CN112370658A (en) * | 2020-10-23 | 2021-02-19 | 北京航星科技有限公司 | Anti-static wrist strap |
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