ESD monitoring circuit and electronic equipment

Abstract

The utility model discloses an ESD monitoring circuit and electronic equipment, and belongs to the technical field of monitoring. Whether a human body is in contact with an electrostatic bracelet is detected through a human body monitoring circuit so as to output a first detection signal; the soldering iron monitoring circuit detects the leakage current of the soldering iron so as to output a second detection signal; the electrostatic tabletop monitoring circuit detects the leakage current of the electrostatic tabletop so as to output a third detection signal; the logic circuit responds to the first detection signal and outputs a control signal according to the first detection signal and / or the second detection signal; the alarm circuit gives an alarm according to the control signal. According to the invention, the electric leakage of the soldering iron and / or the electrostatic table top is alarmed under the condition that personnel are on duty, so that the risk of accidents is reduced, a large amount of human input is not needed, and the management difficulty and the monitoring cost are reduced.

Description

Technical Field

[0001] The present application belongs to the field of monitoring technology, and in particular, relates to an ESD monitoring circuit and electronic equipment. Background Art

[0002] Electrostatic discharge (ESD) is a common source of contact or close-range discharge hazards that can generate high voltage, strong electric field, instantaneous large current, and strong electromagnetic radiation, forming electrostatic discharge electromagnetic pulses. It is the main cause of damage to electronic sensitive devices or equipment, and in severe cases can cause explosion and fire risks.

[0003] The current status and investigation and analysis of ESD monitoring are as follows: ① The current human body static electricity adopts the electrostatic wristband inspection mechanism, and it is impossible to trace the specific cause and conduct risk assessment after the electrostatic hazard occurs; ② The operation process lacks real-time supervision and management of the wearing of electrostatic wristbands, and there is no prevention mechanism for the staff to miss the wearing of electrostatic wristbands or wear them improperly; ③ The operation process is adjusted at any time, and the post is carried out in a mobile manner, and there is a lack of effective and timely identification and supervision and management mechanism for the electrostatic system; ④ The soldering iron tools used in the operation are manually recorded for leakage and static electricity detection once a day, and real-time monitoring is impossible; ⑤ The static grounding system of the work surface is manually inspected and recorded quarterly, and real-time monitoring is impossible, and damage to sensitive devices or equipment caused by static electricity occurs at any time. The above status has the following defects and deficiencies: ① The frequency detection, calibration, maintenance, equipment investment and paper file records of multiple projects lead to difficulties in management and high cost investment; ② People, machines, materials, environment, etc. cannot be monitored in real time, resulting in potential risks for products and serious threats to their life cycle; after static electricity accumulates, the uncontrollable high static environment leads to accidents of gas and liquid combustion and explosion, which is high risk. Summary of the invention

[0004] The purpose of the present application is to provide an ESD monitoring circuit and electronic equipment, aiming to solve the problems of difficult management, high cost and high risk in existing ESD monitoring.

[0005] The embodiment of the present application provides an ESD monitoring circuit, including: a human body monitoring circuit, detecting whether a human body is in contact with an anti-static wristband to output a first detection signal;

[0006] A soldering iron monitoring circuit configured to detect a leakage current of the soldering iron to output a second detection signal;

[0007] An electrostatic table monitoring circuit is configured to detect leakage current of the electrostatic table to output a third detection signal;

[0008] a logic circuit connected to the human body monitoring circuit, the electrostatic table monitoring circuit and the soldering iron monitoring circuit, and configured to respond to the first detection signal and output a control signal according to the first detection signal and / or the second detection signal;

[0009] The alarm circuit is connected to the logic and configured to give an alarm according to the control signal.

[0010] In one of the embodiments, at least one instrument monitoring circuit is also included;

[0011] The instrument monitoring circuit is configured to detect leakage current of the instrument to output a fourth detection signal;

[0012] The logic circuit is also connected to at least one of the instrument monitoring circuits, and is specifically configured to respond to the first detection signal and output the control signal based on at least one of the fourth detection signal, the second detection signal and the third detection signal.

[0013] In one embodiment, the logic circuit includes a first AND gate, a second AND gate, a fourth AND gate and at least a third AND gate;

[0014] The first AND gate is connected to the human body monitoring circuit and the soldering iron monitoring circuit, and is configured to perform an AND operation on the first detection signal and the second detection signal to output a first digital signal;

[0015] The second AND gate is connected to the human body monitoring circuit and the electrostatic table monitoring circuit, and is configured to perform an AND operation on the first detection signal and the third detection signal to output a second digital signal;

[0016] The third AND gate is connected to the human body monitoring circuit and the instrument monitoring circuit, and is configured to perform an AND operation on the first detection signal and the fourth detection signal to output a third digital signal;

[0017] The fourth AND gate is connected to the first AND gate, the second AND gate, at least one of the third AND gates and the alarm circuit, and is configured to perform an AND operation on the first digital signal, the second digital signal and at least one of the third digital signals to output the control signal.

[0018] In one embodiment, it also includes:

[0019] an infrared detection circuit configured to sense the approach of a human body to output a trigger signal;

[0020] The switch circuit is connected to the infrared detection circuit, the logic circuit, the alarm circuit, the human body monitoring circuit, the electrostatic table monitoring circuit and the soldering iron monitoring circuit, and is configured to transmit a power supply voltage according to the trigger signal to power each functional circuit.

[0021] In one embodiment, the alarm circuit comprises:

[0022] a driving circuit, connected to the logic circuit and configured to output a driving voltage according to the control signal;

[0023] A buzzer is connected to the driving circuit and is configured to give an alarm according to the driving voltage.

[0024] In one embodiment, the driving circuit includes a third comparator, a fourth comparator, a second diode, a fifteenth resistor, a sixteenth resistor, and a seventeenth resistor;

[0025] The anode of the second diode serves as the control signal input terminal of the drive circuit and is connected to the logic circuit to input the control signal; the cathode of the second diode is connected to the inverting input terminal of the third comparator and the first end of the seventeenth resistor, the second end of the seventeenth resistor is connected to the output terminal of the third comparator, the non-inverting input terminal of the fourth comparator and the first end of the fifteenth resistor, the second end of the fifteenth resistor is connected to the non-inverting input terminal of the third comparator and the first end of the sixteenth resistor, the second end of the sixteenth resistor is connected to the electrostatic ground, the ground terminal of the comparator is connected to the power supply ground, the inverting input terminal of the fourth comparator and the output terminal of the fourth comparator jointly serve as the drive voltage output terminal of the drive circuit and are connected to the buzzer to output the drive voltage.

[0026] In one embodiment, the human body monitoring circuit includes a first comparator, a second comparator, a first capacitor, a second capacitor, a first diode, a fourth sliding variable resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, an eighteenth resistor, and a nineteenth resistor;

[0027] The first end of the eighteenth resistor and the first end of the twelfth resistor are commonly used as the power supply voltage input end of the human body monitoring circuit, and are connected to the switching circuit to input the power supply voltage; the second end of the eighteenth resistor and the first end of the nineteenth resistor, the non-inverting input end of the second comparator and the first end of the fourteenth resistor are commonly connected to the electrostatic ground, and the second end of the nineteenth resistor is connected to the power ground; the second end of the twelfth resistor is connected to the first end of the eleventh resistor and the inverting input end of the second comparator, and the output end of the second comparator serves as the first detection signal output end of the human body monitoring circuit and is connected to the logic circuit to output the first detection signal; the second end of the eleventh resistor is connected to the anode of the first diode, and the first diode The negative electrode is connected to the first end of the first capacitor, the first end of the thirteenth resistor, the first end of the eighth resistor and the output end of the first comparator, the second end of the thirteenth resistor is connected to the first end of the second capacitor and the inverting input end of the first comparator, the second end of the first capacitor, the second end of the second capacitor and the first end of the tenth resistor are connected, the second end of the tenth resistor is connected to the second end of the fourth sliding rheostat, the first end of the fourth sliding rheostat and the adjustment end of the fourth sliding rheostat are commonly connected to the electrostatic ground; the first end of the ninth resistor is connected to the non-inverting input end of the first comparator and the second end of the fourteenth resistor, the second end of the eighth resistor and the second end of the ninth resistor are commonly connected to the electrostatic wristband.

[0028] In one embodiment, the soldering iron monitoring circuit includes a fifth comparator, a first TVS tube, a first inductor, a first sliding resistor, a first inverter, a fourth diode, a first resistor, and a second resistor;

[0029] The first end of the first resistor and the power supply end VCC of the fifth comparator are jointly used as the power supply voltage input end of the soldering iron monitoring circuit, and are connected to the switching circuit to input the power supply voltage; the second end of the first resistor is connected to the inverting input end of the fifth comparator and the second end of the first sliding rheostat; the first end of the first TVS tube, the second end of the first TVS tube, the first end of the first inductor, the first end of the second resistor, the first end of the first sliding rheostat, the adjustment end of the first sliding rheostat and the ground end of the fifth comparator are jointly used as the leakage current input end of the soldering iron of the soldering iron monitoring circuit, and are connected to the soldering iron to input the leakage current of the soldering iron; the second end of the first inductor, the second end of the second resistor and the positive electrode of the fourth diode are connected, the negative electrode of the fourth diode is connected to the positive input end of the fifth comparator, the output end of the fifth comparator is connected to the input end of the first inverter, and the output end of the first inverter is used as the second detection signal output end of the soldering iron monitoring circuit, and is connected to the logic circuit to output the second detection signal.

[0030] In one embodiment, the electrostatic table monitoring circuit includes a sixth comparator, a second TVS tube, a second inductor, a second sliding resistor, a second inverter, a sixth resistor and a seventh resistor;

[0031] The first end of the sixth resistor, the power supply end of the sixth comparator and the second end of the second sliding rheostat are collectively used as the power supply voltage input end of the electrostatic table monitoring circuit, and are connected to the switching circuit to input the power supply voltage; the first end of the second TVS tube, the second end of the second TVS tube, the first end of the second inductor, the first end of the seventh resistor, and the ground end of the sixth comparator are collectively used as the leakage current input end of the electrostatic table of the electrostatic table monitoring circuit, and are connected to the electrostatic table to input the leakage current of the electrostatic table; the second end of the sixth resistor is connected to the non-inverting input end of the sixth comparator and the second end of the second inductor, and the first end of the second sliding rheostat, the adjustment end of the second sliding rheostat, the second end of the seventh resistor and the inverting input end of the sixth comparator are connected; the output end of the sixth comparator is connected to the input end of the second inverter, and the output end of the second inverter is used as the second detection signal output end of the electrostatic table monitoring circuit, and is connected to the logic circuit to output the second detection signal.

[0032] An embodiment of the present application further provides an electronic device, which includes the above-mentioned ESD monitoring circuit.

[0033] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the human body monitoring circuit detects whether the human body is in contact with the anti-static bracelet to output a first detection signal; the soldering iron monitoring circuit detects the leakage current of the soldering iron to output a second detection signal; the electrostatic table monitoring circuit detects the leakage current of the electrostatic table to output a third detection signal; the logic circuit responds to the first detection signal and outputs a control signal according to the first detection signal and / or the second detection signal; the alarm circuit alarms according to the control signal. The wearing condition of the anti-static bracelet is monitored in real time by the human body monitoring circuit, the leakage current of the soldering iron is monitored in real time by the soldering iron monitoring circuit, and the leakage current of the electrostatic table is monitored in real time by the electrostatic table monitoring circuit. When personnel are on duty, an alarm is issued for the leakage of the soldering iron and / or the electrostatic table, thereby reducing the risk of accidents, and does not require a large amount of manpower investment, thereby reducing the difficulty of management and the cost of monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical application in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of the structure of an ESD monitoring circuit provided in one embodiment of the present application;

[0036] Figure 2 Another structural schematic diagram of an ESD monitoring circuit provided in an embodiment of the present application;

[0037] Figure 3 Another structural schematic diagram of an ESD monitoring circuit provided in an embodiment of the present application;

[0038] Figure 4 Another structural schematic diagram of an ESD monitoring circuit provided in an embodiment of the present application;

[0039] Figure 5 A partial exemplary circuit schematic diagram of an ESD monitoring circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] Figure 1 The structure diagram of the ESD monitoring circuit provided by an embodiment of the present application is shown. For the convenience of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0045] The ESD monitoring circuit includes a human body monitoring circuit 100 , a soldering iron monitoring circuit 200 , an electrostatic table monitoring circuit 300 , a logic circuit 400 and an alarm circuit 500 .

[0046] The human body monitoring circuit 100 detects whether the human body is in contact with the anti-static wristband to output a first detection signal.

[0047] The soldering iron monitoring circuit 200 is configured to detect the leakage current of the soldering iron to output a second detection signal.

[0048] The electrostatic table monitoring circuit 300 is configured to detect the leakage current of the electrostatic table to output a third detection signal.

[0049] The logic circuit 400 is connected to the human body monitoring circuit 100, the electrostatic table monitoring circuit 300 and the soldering iron monitoring circuit 200, and is configured to respond to the first detection signal and output a control signal according to the first detection signal and / or the second detection signal.

[0050] The alarm circuit 500 is connected to the logic and configured to alarm according to the control signal.

[0051] The wearing condition of the anti-static bracelet is monitored in real time through the human body monitoring circuit 100, the leakage current of the soldering iron is monitored in real time through the soldering iron monitoring circuit 200, and the leakage current of the anti-static table is monitored in real time through the anti-static table monitoring circuit 300. When personnel are on duty, the leakage current of the soldering iron and / or the anti-static table is alarmed, thereby reducing the risk of accidents without requiring a large amount of manpower investment, reducing the difficulty of management and the cost of monitoring.

[0052] By way of example and not limitation, Figure 2 As shown, the ESD monitoring circuit further includes at least one instrument monitoring circuit 600 .

[0053] The instrument monitoring circuit 600 is configured to detect the leakage current of the instrument to output a fourth detection signal.

[0054] The logic circuit 400 is also connected to at least one instrument monitoring circuit 600, and is specifically configured to output a control signal in response to the first detection signal according to at least one fourth detection signal, the second detection signal and at least one detection signal among the third detection signal.

[0055] By monitoring the energized equipment through the instrument monitoring circuit 600, the safety of the circuit is further improved, and a corresponding number of instrument monitoring circuits can be configured according to actual needs, thereby improving the expandability and adaptability of the circuit.

[0056] By way of example and not limitation, Figure 3 As shown, the ESD monitoring circuit further includes an infrared detection circuit 700 and a switch circuit 800 .

[0057] The infrared detection circuit 700 is configured to sense the approach of a human body to output a trigger signal.

[0058] The switch circuit 800 is connected to the infrared detection circuit 700, the logic circuit 400, the alarm circuit 500, the human body monitoring circuit 100, the electrostatic table monitoring circuit 300 and the soldering iron monitoring circuit 200, and is configured to transmit a power supply voltage according to a trigger signal to power each functional circuit.

[0059] The infrared detection circuit 700 ensures that the circuit is powered only when someone is on duty and is powered off when no one is on duty, thus saving electric energy.

[0060] By way of example and not limitation, Figure 4 As shown, the alarm circuit 500 includes a driving circuit 510 and a buzzer SPK1.

[0061] The driving circuit 510 is connected to the logic circuit 400 and is configured to output a driving voltage according to a control signal.

[0062] The buzzer SPK1 is connected to the driving circuit 510 and is configured to give an alarm according to the driving voltage.

[0063] The SPK1 buzzer is used to sound an alarm, enriching the product's functions.

[0064] Figure 5 A partial exemplary circuit structure of an ESD monitoring circuit provided in an embodiment of the present application is shown. For ease of explanation, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0065] The logic circuit 400 includes a first AND gate A1 , a second AND gate A2 , a fourth AND gate 410 , and at least one third AND gate A3 .

[0066] The first AND gate A1 is connected to the human body monitoring circuit 100 and the soldering iron monitoring circuit 200 , and is configured to perform an AND operation on the first detection signal and the second detection signal to output a first digital signal.

[0067] The second AND gate A2 is connected to the human body monitoring circuit 100 and the electrostatic table monitoring circuit 300, and is configured to perform an AND operation on the first detection signal and the third detection signal to output a second digital signal.

[0068] The third AND gate A3 is connected to the human body monitoring circuit 100 and the instrument monitoring circuit 600, and is configured to perform an AND operation on the first detection signal and the fourth detection signal to output a third digital signal.

[0069] The fourth AND gate 410 is connected to the first AND gate A1, the second AND gate A2, at least one third AND gate A3 and the alarm circuit 500, and is configured to perform an AND operation on the first digital signal, the second digital signal and at least one third digital signal to output a control signal.

[0070] Among them, the first end of the first AND gate A1 is used as the first detection signal input end, connected to the human body monitoring circuit 100 to input the first detection signal; the second end of the first AND gate A1 is used as the second detection signal input end, connected to the soldering iron monitoring circuit 200 to input the second detection signal; the output end of the first AND gate A1 is used as the first digital signal output end, connected to the fourth AND gate 410 to output the first digital signal; the first end of the second AND gate A2 is used as the first detection signal input end, connected to the human body monitoring circuit 100 to input the first detection signal; the second end of the second AND gate A2 is used as the third detection signal input end , connected to the electrostatic table monitoring circuit 300 to input the second detection signal; the output end of the second AND gate A2 is used as the second digital signal output end, connected to the fourth AND gate 410 to output the second digital signal; the first end of the third AND gate A3 is used as the first detection signal input end, connected to the human body monitoring circuit 100 to input the first detection signal; the second end of the third AND gate A3 is used as the fourth detection signal input end, connected to the instrument monitoring circuit 600 to input the fourth detection signal; the output end of the third AND gate A3 is used as the first digital signal output end, connected to the fourth AND gate 410 to output the third digital signal.

[0071] The fourth AND gate 410 includes a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8 and a twentieth resistor R20.

[0072] The cathode of the fifth diode D5 is used as the first digital signal input terminal of the fourth AND gate 410, connected to the first AND gate A1, to input the first digital signal; the cathode of the sixth diode D6 is used as the second digital signal input terminal of the fourth AND gate 410, connected to the second AND gate A2, to input the second digital signal; the cathode of the seventh diode D7 is used as the first third digital signal input terminal of the fourth AND gate 410, connected to the first third AND gate A3, to input the first third digital signal; the first end of the twentieth resistor R20 is used as the power supply voltage input terminal of the fourth AND gate 410, connected to the switch circuit 800, to input the power supply voltage; the cathode of the eighth diode D8 is used as the second third digital signal input terminal of the fourth AND gate 410, connected to the second third AND gate A3, to input the second third digital signal; the anode of the fifth diode D5, the anode of the sixth diode D6, the anode of the seventh diode D7, the anode of the eighth diode D8 and the second end of the twentieth resistor R20 are used together as the control signal output terminal of the fourth AND gate 410, connected to the alarm circuit 500, to output the control signal.

[0073] Through multiple AND gates, the function of responding to the contact between the human body and the anti-static wristband and giving an alarm according to the leakage of the soldering iron and / or the leakage of the anti-static table is realized, which has strong real-time performance and high reliability.

[0074] The driving circuit 510 includes a third comparator M3, a fourth comparator M4, a second diode D2, a fifteenth resistor R15, a sixteenth resistor R16 and a seventeenth resistor R17.

[0075] The anode of the second diode D2 is connected to the logic circuit 400 as the control signal input terminal of the driving circuit 510 to input the control signal; the cathode of the second diode D2 is connected to the inverting input terminal Inverting Input3 of the third comparator M3 and the first end of the seventeenth resistor R17; the second end of the seventeenth resistor R17 is connected to the output terminal Output3 of the third comparator M3, the positive input terminal Non-Inverting Input4 of the fourth comparator M4 and the first end of the fifteenth resistor R15; the second end of the fifteenth resistor R15 is connected to the positive input terminal Non-Inverting Input3 of the third comparator M3 and the first end of the sixteenth resistor R16; the second end of the sixteenth resistor R16 is connected to the electrostatic ground EP1; the ground terminal VCC- of the comparator is connected to the power ground; the inverting input terminal Inverting Input4 of the fourth comparator M4 and the output terminal Output4 of the fourth comparator M4 are jointly connected to the driving voltage output terminal of the driving circuit 510 and are connected to the buzzer SPK1 to output the driving voltage.

[0076] The anode of the buzzer SPK1 is connected to the driving circuit 510 as a driving voltage input terminal, the cathode of the buzzer SPK1 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the power ground.

[0077] The driving circuit 510 is formed by a comparator, which is easy to implement, low in cost and ensures the normal operation of the device.

[0078] The human body monitoring circuit 100 includes a first comparator M1, a second comparator M2, a first capacitor C1, a second capacitor C2, a first diode D1, a fourth sliding variable resistor RH4, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, an eighteenth resistor R18 and a nineteenth resistor R19.

[0079] The first end of the eighteenth resistor R18 and the first end of the twelfth resistor R12 are used together as the power supply voltage input end of the human body monitoring circuit 100, and are connected to the switch circuit 800 to input the power supply voltage; the second end of the eighteenth resistor R18 and the first end of the nineteenth resistor R19, the non-inverting input end Non-Inverting Input2 of the second comparator M2 and the first end of the fourteenth resistor R14 are connected to the electrostatic ground EP1, and the second end of the nineteenth resistor R19 is connected to the power ground; the second end of the twelfth resistor R12 and the first end of the eleventh resistor R11 and the inverting input end Inverting Input2 of the second comparator M2 Input2 is connected, the output terminal Output2 of the second comparator M2 is used as the first detection signal output terminal of the human body monitoring circuit 100, and is connected to the logic circuit 400 to output the first detection signal; the second end of the eleventh resistor R11 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the first end of the first capacitor C1, the first end of the thirteenth resistor R13, the first end of the eighth resistor R8 and the output terminal Output1 of the first comparator M1, the second end of the thirteenth resistor R13 is connected to the first end of the second capacitor C2 and the inverting input terminal Inverting Input1 of the first comparator M1, the second end of the first capacitor C1, the second end of the second capacitor C2 and the first end of the tenth resistor R10 are connected, the second end of the tenth resistor R10 is connected to the second end of the fourth sliding variable resistor RH4, the first end of the fourth sliding variable resistor RH4 and the adjustment end of the fourth sliding variable resistor RH4 are commonly connected to the electrostatic ground EP1; the first end of the ninth resistor R9 is connected to the non-inverting input terminal Non-Inverting Input1 of the first comparator M1 Input1 and the second end of the fourteenth resistor R14 are connected, and the second end of the eighth resistor R8 and the second end of the ninth resistor R9 are commonly connected to the anti-static wristband.

[0080] The voltage of the anti-static wristband is collected through the ninth resistor R9 to detect whether the large loop formed by the human body through the anti-static wristband jack grounding and the anti-static shoe grounding meets the industry standard of less than 35M (IEC standard), and the balance state of the second comparator M2 is adjusted through the twelfth resistor R12, and the first capacitor C1 and the second capacitor C2 are used to achieve voltage balance between the two comparators.

[0081] The feedback network circuit formed by the eighth resistor R8 and the ninth resistor R9 ensures that the output state of the first comparator M1 is stable, strengthens the first detection signal, and improves the reliability and stability of the circuit.

[0082] The soldering iron monitoring circuit 200 includes a fifth comparator M5, a first transient voltage suppressor (TVS) diode TVS1, a first inductor L1, a first sliding resistor RH1, a first inverter F1, a fourth diode D4, a first resistor R1 and a second resistor R2.

[0083] The first end of the first resistor R1 and the power supply end VCC of the fifth comparator M5 are used as the power supply voltage input end of the soldering iron monitoring circuit 200, and are connected to the switch circuit 800 to input the power supply voltage; the second end of the first resistor R1 is connected to the inverting input end InputsA- of the fifth comparator M5 and the second end of the first sliding variable resistor RH1; the first end of the first TVS tube TVS1, the second end of the first TVS tube TVS1, the first end of the first inductor L1, the first end of the second resistor R2, the first end of the first sliding variable resistor RH1, the adjustment end of the first sliding variable resistor RH1 and the fifth comparator M5 The ground terminal GND of the soldering iron monitoring circuit 200 is used together as the leakage current input terminal of the soldering iron, which is connected to the soldering iron to input the leakage current of the soldering iron; the second end of the first inductor L1, the second end of the second resistor R2 and the positive electrode of the fourth diode D4 are connected, the cathode of the fourth diode D4 is connected to the positive input terminal InputsA+ of the fifth comparator M5, the output terminal OutputA of the fifth comparator M5 is connected to the input terminal 1A of the first inverter F1, and the output terminal 1F of the first inverter F1 is used as the second detection signal output terminal of the soldering iron monitoring circuit 200, which is connected to the logic circuit 400 to output the second detection signal.

[0084] The first TVS tube TVS1 is used to prevent leakage and high voltage from damaging devices, the first inductor L1 is used to prevent high-frequency voltage from flowing through the circuit, and the first resistor R1 and the first sliding variable resistor RH1 are used to control the reference voltage of the inverting input terminal InputsA- of the fifth comparator M5, so that the threshold for monitoring leakage current can be controlled, thereby improving the safety of the circuit.

[0085] It should be noted that in this circuit, not only can the reference voltage of the inverting input terminal InputsA- of the fifth comparator M5 be freely adjusted by changing the resistance value of the first sliding resistor RH1, but the first sliding resistor RH1 can also be replaced with a dip switch and multiple fixed resistors according to actual needs, thereby achieving fixed gear adjustment.

[0086] The electrostatic table monitoring circuit 300 includes a sixth comparator M6, a second TVS tube TVS2, a second inductor L2, a second sliding resistor RH2, a second inverter F2, a sixth resistor R6 and a seventh resistor R7.

[0087] The first end of the sixth resistor R6, the power supply end VCC of the sixth comparator M6, and the second end of the second sliding variable resistor RH2 are used together as the power supply voltage input end of the electrostatic table monitoring circuit 300, and are connected to the switch circuit 800 to input the power supply voltage; the first end of the second TVS tube TVS2, the second end of the second TVS tube TVS2, the first end of the second inductor L2, the first end of the seventh resistor R7, and the ground end GND of the sixth comparator M6 are used together as the leakage current input end of the electrostatic table of the electrostatic table monitoring circuit 300, and are connected to the electrostatic table to input the leakage current of the electrostatic table; the sixth The second end of the resistor R6 is connected to the positive input terminal InputsA+ of the sixth comparator M6 and the second end of the second inductor L2, and the first end of the second sliding variable resistor RH2, the adjustment end of the second sliding variable resistor RH2, the second end of the seventh resistor R7 and the inverting input terminal InputsA- of the sixth comparator M6 are connected; the output terminal OutputA of the sixth comparator M6 is connected to the input terminal 2A of the second inverter F2, and the output terminal 2F of the second inverter F2 serves as the second detection signal output terminal of the electrostatic table monitoring circuit 300, and is connected to the logic circuit 400 to output a second detection signal.

[0088] The second TVS tube TVS2 is used to prevent leakage and high voltage from damaging devices, the second inductor L2 is used to prevent high-frequency voltage from flowing through the circuit, and the seventh resistor R7 and the second sliding variable resistor RH2 are used to control the reference voltage of the inverting input terminal InputsA- of the fifth comparator M5, so that the threshold value of the leakage current of the electrostatic table can be controlled, thereby improving the safety of the circuit.

[0089] It should be noted that in this circuit, not only can the reference voltage of the inverting input terminal InputsA- of the fifth comparator M5 be freely adjusted by changing the resistance value of the second sliding rheostat RH2, but the second sliding rheostat RH2 can also be replaced with a dip switch and multiple fixed resistors according to actual needs, thereby achieving fixed gear adjustment.

[0090] The infrared detection circuit 700 includes a photocoupler LED1 , a regulator T1 , a first transistor Q1 , a second transistor Q2 , a twenty-first resistor R21 , a twenty-second resistor R22 , a twenty-fourth resistor R24 ​​, and a twenty-fifth resistor R25 .

[0091] The positive electrode of the photoelectric coupler LED1, the collector of the photoelectric coupler LED1, the collector of the first transistor Q1, the first end of the twenty-first resistor R21 and the first end of the twenty-second resistor R22 are collectively used as the power supply voltage end of the infrared detection circuit 700 to input the power supply voltage, the negative electrode of the photoelectric coupler LED1, the first end of the twenty-fourth resistor R24, the first end of the twenty-fifth resistor R25, the positive electrode of the regulator T1 and the emitter of the second transistor Q2 are collectively connected to the electrostatic ground EP1, the emitter of the photoelectric coupler LED1 is connected to the base of the first transistor Q1 and the second end of the twenty-fourth resistor R24, the emitter of the first transistor Q1, the reference end of the regulator T1 and the second end of the twenty-fifth resistor R25 are connected, the negative electrode of the regulator T1, the second end of the twenty-first resistor R21 and the base of the second transistor Q2 are connected, the second end of the twenty-second resistor R22 and the collector of the second transistor Q2 are collectively used as the trigger signal output end of the infrared detection circuit 700, and are connected to the switch circuit 800 to output the trigger signal.

[0092] The switch circuit 800 includes a twenty-third resistor R23, a third transistor Q3 and a field effect transistor Q4.

[0093] The first end of the twenty-third resistor R23 and the source of the field effect transistor Q4 are used together as the power supply voltage end of the switch circuit 800 to input the power supply voltage; the second end of the twenty-third resistor R23, the gate of the field effect transistor Q4 and the collector of the third transistor Q3 are connected, the base of the third transistor Q3 is used as the trigger signal output end of the switch circuit 800, and is connected to the infrared detection circuit 700 to input the trigger signal, and the drain of the field effect transistor Q4 is used as the power supply voltage output end of the switch circuit 800, and is connected to the logic circuit 400, the alarm circuit 500, the human body monitoring circuit 100, the electrostatic table monitoring circuit 300 and the soldering iron monitoring circuit 200 to output the power supply voltage.

[0094] The instrument monitoring circuit 600 includes a seventh comparator M7, a third TVS tube TVS3, a third inductor L3, a third sliding resistor RH3, a third inverter F3, a ninth diode D9, a third resistor R3, a fourth resistor R4 and a fifth resistor R5.

[0095] The first end of the third resistor R3, the first end of the fourth resistor R4 and the power supply terminal VCC of the seventh comparator M7 are used together as the power supply voltage input terminal of the electrostatic table monitoring circuit 300, and are connected to the switch circuit 800 to input the power supply voltage; the first end of the third TVS tube TVS3, the second end of the third TVS tube TVS3, the first end of the third inductor L3, the first end of the fifth resistor R5, the first end of the third sliding variable resistor RH3, the adjustment end of the third sliding variable resistor RH3 and the ground terminal GND of the seventh comparator M7 are used together as the leakage current input terminal of the electrostatic table of the electrostatic table monitoring circuit 300, and are connected to the electrostatic table to input the leakage current of the electrostatic table. Flow; the second end of the fifth resistor R5, the second end of the third inductor L3, the second end of the third resistor R3 and the anode of the ninth diode D9 are connected, the cathode of the ninth diode D9 is connected to the non-phase input terminal InputsA+ of the seventh comparator M7, the second end of the fourth resistor R4, the second end of the third sliding rheostat RH3 and the inverting input terminal InputsA- of the seventh comparator M7 are connected; the output terminal OutputA of the seventh comparator M7 is connected to the input terminal 3A of the third inverter F3, and the output terminal 3F of the third inverter F3 is used as the third detection signal output terminal of the instrument monitoring circuit 600, and is connected to the logic circuit 400 to output the third detection signal.

[0096] It should be noted that the parts of the above circuits connected to the power supply voltage can be added with filter capacitors and / or current limiting resistors according to actual needs.

[0097] The following is a combination of working principles Figure 5 As shown for further explanation:

[0098] Take two instrument monitoring circuits 600 as an example for explanation. When someone is on duty, the infrared receiving tube of the photocoupler LED1 is turned on, the first transistor Q1 is turned on, the second transistor Q2 is turned off, the second end of the twenty-second resistor R22 and the collector of the second transistor Q2 jointly output a high-level trigger signal, the third transistor Q3 is turned on, the field effect transistor Q4 is turned on, the source of the field effect transistor Q4 is connected to the power supply voltage, and the power supply voltage is output from the drain of the field effect transistor Q4 to each functional module for power supply.

[0099] After power supply, the ninth resistor R9 collects the voltage of the anti-static wristband and transmits the voltage to the non-inverting input terminal Non-Inverting Input1 of the first comparator M1. The first end of the fourth sliding variable resistor RH4 is connected to the electrostatic ground EP1. The voltage of the electrostatic ground EP1 is the value after the eighteenth resistor R18 and the nineteenth resistor R19 divide the power supply voltage. The second end of the fourth sliding variable resistor RH4 outputs a reference voltage to the inverting input terminal Inverting Input1 of the first comparator M1. The first comparator M1 compares the voltage of the anti-static wristband with the reference voltage, and outputs a low level from the output terminal Output1 of the first comparator M1 when the voltage of the anti-static wristband is lower than the reference voltage; the inverting input terminal Inverting Input2 of the second comparator M2 is connected to the voltage of the anti-static wristband, and the non-inverting input terminal Non-Inverting Input2 of the second comparator M2 is connected to the power supply voltage through the twelfth resistor R12. After the output terminal Output1 of the first comparator M1 outputs a low level, the first diode D1 is turned on, and the non-inverting input terminal Non-Inverting Input2 of the second comparator M2 is connected to the power supply voltage. The level of Input2 is pulled low, and the second comparator M2 outputs a low-level first detection signal from the output terminal Output2 of the second comparator M2 to the first terminal of the first AND gate A1, the first terminal of the second AND gate A2, and the first terminals of the two third AND gates A3 respectively. If the voltage of the anti-static wristband is higher than the reference voltage, the output terminal Output2 of the second comparator M2 stops outputting the low-level first detection signal.

[0100] When the soldering iron generates leakage current, the first end of the first inductor L1 is connected to the leakage current, and a first alarm voltage is formed at the positive input terminal InputsA+ of the fifth comparator M5; the inverting input terminal InputsA- of the fifth comparator M5 is connected to the first reference voltage set by the first sliding resistor RH1, and when the first alarm voltage is higher than the first reference voltage, a high level is output from the output terminal OutputA of the fifth comparator M5 to the input terminal 1A of the first inverter F1, the first inverter F1 inverts the level, and outputs a low-level second detection signal from the output terminal 1F of the first inverter F1 to the second end of the first AND gate A1. If the soldering iron does not generate leakage current, the output terminal 1F of the first inverter F1 stops outputting the low-level second detection signal.

[0101] When the electrostatic table generates leakage current, the first end of the second inductor L2 is connected to the leakage current, and a second alarm voltage is formed at the positive input terminal InputsA+ of the sixth comparator M6; the inverting input terminal InputsA- of the fifth comparator M5 is connected to the second reference voltage set by the first sliding resistor RH1, and when the second alarm voltage is higher than the second reference voltage, a high level is output from the output terminal OutputA of the sixth comparator M6 to the input terminal 2A of the second inverter F2, the second inverter F2 inverts the level, and outputs a low-level second detection signal from the output terminal 1F of the second inverter F2 to the second end of the second AND gate A2. If the electrostatic table does not generate leakage current, the output terminal 2F of the second inverter F2 stops outputting the low-level second detection signal.

[0102] When any instrument generates leakage current, the first end of the third inductor L3 is connected to the leakage current, and a third alarm voltage is formed at the positive input terminal InputsA+ of the seventh comparator M7; the inverting input terminal InputsA- of the fifth comparator M5 is connected to the third reference voltage set by the third sliding resistor RH3, and when the third alarm voltage is higher than the third reference voltage, a high level is output from the output terminal OutputA of the seventh comparator M7 to the input terminal 3A of the third inverter F3, the third inverter F3 inverts the level, and outputs a low-level third detection signal from the output terminal 3F of the third inverter F3 to the second end of the third AND gate A3; if the instrument does not generate leakage current, the output terminal 3F of the third inverter F3 stops outputting the low-level third detection signal.

[0103] The first AND gate A1 outputs a low-level first digital signal to the cathode of the fifth diode D5 according to the low-level first detection signal and / or the low-level second detection signal, the second AND gate A2 outputs a low-level second digital signal to the cathode of the sixth diode D6 according to the low-level first detection signal and / or the low-level third detection signal, the first third AND gate A3 outputs a low-level third digital signal to the cathode of the seventh diode D7 according to the low-level first detection signal and / or the low-level third detection signal, the second third AND gate A3 outputs a low-level third digital signal to the cathode of the eighth diode D8 according to the low-level first detection signal and / or the low-level third detection signal, the first end of the twentieth resistor R20 inputs the supply voltage, when any one of the AND gates outputs a low-level digital signal, the diode corresponding to the AND gate is turned on, and a low-level control signal is output from the anode of the fifth diode D5, the anode of the sixth diode D6, the anode of the seventh diode D7, the anode of the eighth diode D8 and the second end of the twentieth resistor R20 to the anode of the second diode D2, the inverting input terminal of the third comparator M3 is In ... Input3 becomes a low level, the non-inverting input terminal Non-InvertingInput3 of the third comparator M3 is connected to the electrostatic ground EP1, the third comparator M3 outputs a high level from the output terminal Output3 of the third comparator M3 to the non-inverting input terminal Non-Inverting Input4 of the fourth comparator M4, and the output terminal Output4 of the fourth comparator M4 outputs a driving voltage to the buzzer SPK1, and the buzzer SPK1 alarms.

[0104] An embodiment of the present application further provides an electronic device, which includes the above-mentioned ESD monitoring circuit.

[0105] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0106] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An ESD monitoring circuit, characterized in that: include: A human body monitoring circuit detects whether the human body is in contact with the anti-static wristband to output a first detection signal; A soldering iron monitoring circuit configured to detect a leakage current of the soldering iron to output a second detection signal; An electrostatic table monitoring circuit is configured to detect leakage current of the electrostatic table to output a third detection signal; a logic circuit connected to the human body monitoring circuit, the electrostatic table monitoring circuit and the soldering iron monitoring circuit, and configured to respond to the first detection signal and output a control signal according to the first detection signal and / or the second detection signal; The alarm circuit is connected to the logic and configured to give an alarm according to the control signal.

2. The ESD monitoring circuit according to claim 1, characterized in that: Also included is at least one instrument monitoring circuit; The instrument monitoring circuit is configured to detect leakage current of the instrument to output a fourth detection signal; The logic circuit is also connected to at least one of the instrument monitoring circuits, and is specifically configured to respond to the first detection signal and output the control signal based on at least one of the fourth detection signal, the second detection signal and the third detection signal.

3. The ESD monitoring circuit according to claim 2, characterized in that: The logic circuit includes a first AND gate, a second AND gate, a fourth AND gate and at least one third AND gate; The first AND gate is connected to the human body monitoring circuit and the soldering iron monitoring circuit, and is configured to perform an AND operation on the first detection signal and the second detection signal to output a first digital signal; The second AND gate is connected to the human body monitoring circuit and the electrostatic table monitoring circuit, and is configured to perform an AND operation on the first detection signal and the third detection signal to output a second digital signal; The third AND gate is connected to the human body monitoring circuit and the instrument monitoring circuit, and is configured to perform an AND operation on the first detection signal and the fourth detection signal to output a third digital signal; The fourth AND gate is connected to the first AND gate, the second AND gate, at least one of the third AND gates and the alarm circuit, and is configured to perform an AND operation on the first digital signal, the second digital signal and at least one of the third digital signals to output the control signal.

4. The ESD monitoring circuit according to claim 1, wherein: Also includes: an infrared detection circuit configured to sense the approach of a human body to output a trigger signal; The switch circuit is connected to the infrared detection circuit, the logic circuit, the alarm circuit, the human body monitoring circuit, the electrostatic table monitoring circuit and the soldering iron monitoring circuit, and is configured to transmit a power supply voltage according to the trigger signal to power each functional circuit.

5. The ESD monitoring circuit according to claim 1, wherein: The alarm circuit comprises: a driving circuit, connected to the logic circuit and configured to output a driving voltage according to the control signal; A buzzer is connected to the driving circuit and is configured to give an alarm according to the driving voltage.

6. The ESD monitoring circuit according to claim 5, characterized in that: The driving circuit includes a third comparator, a fourth comparator, a second diode, a fifteenth resistor, a sixteenth resistor and a seventeenth resistor; The anode of the second diode is used as a control signal input terminal of the driving circuit and is connected to the logic circuit to input the control signal; The cathode of the second diode is connected to the inverting input terminal of the third comparator and the first end of the seventeenth resistor, the second end of the seventeenth resistor is connected to the output terminal of the third comparator, the non-inverting input terminal of the fourth comparator and the first end of the fifteenth resistor, the second end of the fifteenth resistor is connected to the non-inverting input terminal of the third comparator and the first end of the sixteenth resistor, the second end of the sixteenth resistor is connected to the electrostatic ground, the ground terminal of the comparator is connected to the power supply ground, the inverting input terminal of the fourth comparator and the output terminal of the fourth comparator jointly serve as the driving voltage output terminal of the driving circuit, and are connected to the buzzer to output the driving voltage.

7. The ESD monitoring circuit according to any one of claims 1 to 6, characterized in that: The human body monitoring circuit includes a first comparator, a second comparator, a first capacitor, a second capacitor, a first diode, a fourth sliding variable resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, an eighteenth resistor and a nineteenth resistor; The first end of the eighteenth resistor and the first end of the twelfth resistor are commonly used as the power supply voltage input end of the human body monitoring circuit, and are connected to the switching circuit to input the power supply voltage; the second end of the eighteenth resistor and the first end of the nineteenth resistor, the non-inverting input end of the second comparator and the first end of the fourteenth resistor are commonly connected to the electrostatic ground, and the second end of the nineteenth resistor is connected to the power ground; the second end of the twelfth resistor is connected to the first end of the eleventh resistor and the inverting input end of the second comparator, and the output end of the second comparator serves as the first detection signal output end of the human body monitoring circuit and is connected to the logic circuit to output the first detection signal; the second end of the eleventh resistor is connected to the anode of the first diode, and the first diode The negative electrode is connected to the first end of the first capacitor, the first end of the thirteenth resistor, the first end of the eighth resistor and the output end of the first comparator, the second end of the thirteenth resistor is connected to the first end of the second capacitor and the inverting input end of the first comparator, the second end of the first capacitor, the second end of the second capacitor and the first end of the tenth resistor are connected, the second end of the tenth resistor is connected to the second end of the fourth sliding rheostat, the first end of the fourth sliding rheostat and the adjustment end of the fourth sliding rheostat are commonly connected to the electrostatic ground; the first end of the ninth resistor is connected to the non-inverting input end of the first comparator and the second end of the fourteenth resistor, the second end of the eighth resistor and the second end of the ninth resistor are commonly connected to the electrostatic wristband.

8. The ESD monitoring circuit according to any one of claims 1 to 6, characterized in that: The soldering iron monitoring circuit includes a fifth comparator, a first TVS tube, a first inductor, a first sliding resistor, a first inverter, a fourth diode, a first resistor and a second resistor; The first end of the first resistor and the power supply end of the fifth comparator are jointly used as the power supply voltage input end of the soldering iron monitoring circuit, and are connected to the switching circuit to input the power supply voltage; the second end of the first resistor is connected to the inverting input end of the fifth comparator and the second end of the first sliding rheostat; the first end of the first TVS tube, the second end of the first TVS tube, the first end of the first inductor, the first end of the second resistor, the first end of the first sliding rheostat, the adjustment end of the first sliding rheostat and the ground end of the fifth comparator are jointly used as the leakage current input end of the soldering iron of the soldering iron monitoring circuit, and are connected to the soldering iron to input the leakage current of the soldering iron; the second end of the first inductor, the second end of the second resistor and the positive electrode of the fourth diode are connected, the negative electrode of the fourth diode is connected to the positive input end of the fifth comparator, the output end of the fifth comparator is connected to the input end of the first inverter, and the output end of the first inverter is used as the second detection signal output end of the soldering iron monitoring circuit, and is connected to the logic circuit to output the second detection signal.

9. The ESD monitoring circuit according to any one of claims 1 to 6, characterized in that: The electrostatic table monitoring circuit includes a sixth comparator, a second TVS tube, a second inductor, a second sliding resistor, a second inverter, a sixth resistor and a seventh resistor; The first end of the sixth resistor, the power supply end of the sixth comparator and the second end of the second sliding rheostat are used together as the power supply voltage input end of the electrostatic table monitoring circuit, and are connected to the switch circuit to input the power supply voltage; The first end of the second TVS tube, the second end of the second TVS tube, the first end of the second inductor, the first end of the seventh resistor, and the ground end of the sixth comparator together serve as the leakage current input end of the electrostatic table of the electrostatic table monitoring circuit, and are connected to the electrostatic table to input the leakage current of the electrostatic table; the second end of the sixth resistor is connected to the non-phase input end of the sixth comparator and the second end of the second inductor, and the first end of the second sliding rheostat, the adjustment end of the second sliding rheostat, the second end of the seventh resistor, and the inverting input end of the sixth comparator are connected; the output end of the sixth comparator is connected to the input end of the second inverter, and the output end of the second inverter serves as the second detection signal output end of the electrostatic table monitoring circuit, and is connected to the logic circuit to output the second detection signal.

10. An electronic device, characterized in that: The method comprises an ESD monitoring circuit as claimed in any one of claims 1 to 9.

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