Double-line type anti-static wristband monitoring device

Abstract

The present application relates to a kind of double-line type anti-static wristband monitoring device, comprising: double-line wristband, with electrode for being contacted with human wrist;Wristband continuous monitor is connected with the double-line wristband by adapter box, the wristband continuous monitor host is used to monitor the voltage state of the human wrist, release the voltage on the electrode on the double-line wristband;The adapter box is used to adjust the on-off state of the double-line wristband and the wristband continuous monitor host;When the double-line wristband and the wristband continuous monitor host are disconnected, the wristband continuous monitor host determines the insertion state of the wristband using the adapter box.The present application can distinguish the connection of double-line wristband, and can calculate the double-line wristband path resistance in the case of accidentally touching external voltage during personnel operation, also can calculate the voltage value contacted, and decide whether to alarm according to the above situation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrostatic protection, and particularly relates to a double-wire type anti-static wristband monitoring device. BACKGROUND

[0002] The anti-static wristband is the most commonly used anti-static product in the electrostatic protection area (EPA). Usually, one end of the electrode of the anti-static wristband is connected to the ground connection point, and the other end of the electrode is worn on the wrist and in contact with the skin. The working principle of the anti-static wristband is to discharge the static electricity accumulated on the operator's body in time to avoid the static electricity of the human body from causing damage to the electrostatic sensitive devices and products.

[0003] The anti-static wristband is mainly divided into two forms of wired and wireless. The wireless anti-static wristband utilizes the principle of corona discharge to dissipate part of the static electricity. The wireless anti-static wristband adopting the principle of corona discharge cannot effectively ensure that the electric potential of the human body is reduced to a certain degree, and is not allowed to be used in strict places.

[0004] The anti-static wristband is divided into a single-wire wristband and a double-wire wristband according to the wrist contact point. The ground end of the single-wire wristband is usually in the form of a banana plug, a button, an alligator clip or other single-touch point metals. The wristband end of the single-wire wristband is connected to a metal sheet and is in contact with the skin when the personnel wear it. The ground end of the double-wire wristband is usually in the form of a 3.5mm audio plug or a double banana plug, and has two contact electrodes. The wristband end also has two metal sheet electrodes and is in contact with the human skin when worn.

[0005] In actual work, the most likely problem is that the human body causes the ground path resistance of the wristband to be too high due to various reasons, exceeding the standard specified range. There are many reasons for this result, such as the breakage of the internal wire of the wristband, the aging of the wristband elastic band causing the wristband electrode to not contact the skin, etc.

[0006] In order to continuously monitor the ground path resistance of the anti-static wristband worn by the personnel, a circuit can be designed at the ground end of the wristband to realize two functions, the first being the ground function and the second being the function of measuring the path resistance. The two ends of the path resistance are the ground electrode end and the human body itself.

[0007] According to Ohm's law R=U / I. Only when the voltage and current across the resistance are known at the same time, the resistance value can be calculated. When the single-line anti-static wristband is working, only the grounding electrode is connected to the jack, and one end of the human body is not connected to the circuit, so theoretically the access resistance cannot be calculated. Because the resistance has only one end connected to the circuit and the other end is suspended, the resistance cannot be calculated. Therefore, theoretically, only wearing a single-line anti-static wristband cannot realize the personnel grounding access resistance. The single-line anti-static wristband continuous monitor sold on the market claims to be able to monitor whether the personnel wears the wristband. It does not use the principle of measuring resistance. It uses the principle of capacitance to judge whether the personnel contacts the wristband electrode by monitoring the change of the capacitance caused by the contact of the human body with the wristband electrode. Although this principle can distinguish whether the human skin contacts the wristband electrode at a certain probability, it does not meet the requirements of the relevant standards for grounding access resistance, is not rigorous, and has a certain probability of false alarm and missed alarm.

[0008] A double-line anti-static wristband and a real-time grounding monitoring device are disclosed in Chinese Patent Publication No. CN108226648B. The device monitors and alarms the human wristband grounding access resistance and human body voltage using a double-line anti-static wristband. While the personnel is grounded through the wristband, the test circuit also presents 0 voltage on the human body, realizing the 0 voltage measurement principle. However, the patent has the following shortcomings: 1. After the device is powered on, if there is no worker at a certain work station and no wristband is inserted, an alarm will be generated due to excessive access resistance at this time. 2. The way of calculating the resistance value by summing up the resistance values of two separate branches to obtain the access resistance is correct in the absence of an external input voltage. However, if a voltage V3 is applied to the human body, the calculated value of the access resistance will not be accurate. SUMMARY

[0009] To solve the technical problems existing in the prior art, the purpose of the present application is to provide a double-line anti-static wristband monitoring device that can distinguish between the cases of no wristband insertion and wristband insertion but access resistance exceeding the limit. In the case of external voltage application during work, the device can calculate the accurate access resistance value and external input voltage value, improving the external environment adaptability and measurement accuracy of the system.

[0010] To achieve the above-mentioned application purpose, the present application provides a double-line anti-static wristband monitoring device, comprising:

[0011] A double-line wristband is provided with an electrode for contacting the human wrist;

[0012] A wristband continuous monitor is connected to the double-line wristband through an adapter box. The wristband continuous monitor host is used to monitor the voltage state of the human wrist and release the voltage on the electrode of the double-line wristband.

[0013] The adapter box is used to adjust the on-off state of the double-line wristband and the wristband continuous monitoring host;

[0014] When the double-line wristband and the wristband continuous monitoring host are in the disconnected state, the wristband continuous monitoring host uses the adapter box to judge the insertion state of the wristband.

[0015] According to one technical solution of the present application, the wristband continuous monitoring device includes a monitoring device applied voltage V0, a monitoring device applied voltage -V0, a resistor R1, a resistor R1', a resistor R2, a resistor R2', a ground terminal, a C1 input terminal, and a C2 input terminal.

[0016] One end of the resistor R1 is connected to the voltage output terminal of the voltage source V0;

[0017] The other end of the resistor R1 is connected to one end of the resistor R2 and the C1 input terminal;

[0018] The other end of the resistor R2 is connected to one end of the resistor R2', the G1 input terminal, and the ground terminal;

[0019] The other end of the resistor R2' is connected to one end of the resistor R1' and the C2 input terminal;

[0020] The other end of the resistor R1' is connected to the voltage output terminal of the voltage source -V0.

[0021] According to one technical solution of the present application, the adapter box includes a C1 output terminal, a C2 output terminal, a G1 output terminal, a B1 input terminal, and a B2 input terminal.

[0022] When the adapter box is connected to the double-line wristband, the B1 input terminal is connected to the C1 output terminal;

[0023] The B2 input terminal is connected to the C2 output terminal;

[0024] When the adapter box is disconnected from the double-line wristband, the G1 output terminal is connected to the C1 output terminal;

[0025] The C1 output terminal is adapted to the C1 input terminal, the C2 output terminal is adapted to the C2 input terminal, and the G1 output terminal is adapted to the G1 input terminal.

[0026] According to one technical solution of the present application, the double-line wristband further includes a resistor R3 and a resistor R3';

[0027] The two ends of the resistor R3 are respectively connected to the B1 input terminal and an electrode that contacts the human wrist;

[0028] The two ends of the resistance R3' are connected with the B2 input end and another electrode contacting the human wrist respectively.

[0029] According to one technical solution of the present application, the wristband continuous monitor further comprises an alarm circuit, which generates an alarm signal according to the equivalent path resistance of the double-wire anti-static wristband monitoring device, the externally applied voltage and the condition of the adapter box.

[0030] According to one technical solution of the present application, the wristband continuous monitor judges the condition of the adapter box according to the following formula:

[0031]

[0032] V1=0

[0033] wherein, R a is the equivalent path resistance of the double-wire wristband when not inserted, R1 is the resistance value of the resistance R1, R2 is the resistance value of the resistance R2, V0 is the output voltage of the voltage source V0, V1 is the voltage value of the C1 input end, and V'1 is the voltage value of the C2 input end.

[0034] According to one technical solution of the present application, the alarm circuit calculates the equivalent path resistance and the externally applied voltage of the human body according to the following formula, and alarms when the equivalent path resistance and the externally applied voltage of the human body exceed a threshold value.

[0035]

[0036] wherein, R b is the equivalent path resistance of the double-wire wristband when inserted, I3 is the current value of the C1 input end, I'3 is the current value of the C2 input end, V1 is the voltage value of the C1 input end, V'1 is the voltage value of the C2 input end, and V3 is the externally applied voltage of the human body.

[0037] Compared with the prior art, the present application has the following beneficial effects:

[0038] 1. The adapter box structure with the characteristics similar to a 3.5mm socket is used, and in the case that the double-wire wristband is not inserted into the adapter box, the circuit parameter characteristics are obvious and can be obviously distinguished. In the case that the double-wire wristband is not inserted or is inserted but open, the system will not alarm.

[0039] 2. The calculation formula proposed in the present application can calculate the wristband path resistance and the contact voltage value in the case that the personnel operation process is mistakenly touched by the external voltage. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0041] Figure 1 The circuit equivalent schematic diagram of the double-line anti-static wristband monitoring device of the present application is schematically shown;

[0042] Figure 2 The schematic diagram of the double-line anti-static wristband monitoring device of the present application is schematically shown;

[0043] Figure 3 The circuit equivalent schematic diagram of the double-line anti-static wristband monitoring device of the present application with external voltage V3 input is schematically shown;

[0044] Figure 4 The circuit equivalent schematic diagram of the double-line anti-static wristband monitoring device of the present application when the double-line wristband is inserted is schematically shown. DETAILED DESCRIPTION

[0045] The description of the embodiments of the present application should be combined with the corresponding drawings, which should be considered as a part of the complete description of the present application. In the drawings, the shape or thickness of the embodiments can be exaggerated and simplified or convenient for illustration. Moreover, the parts of the structures in the drawings will be described separately, and it should be noted that the elements not shown or not described in the drawings are in the form known by those skilled in the art.

[0046] The description of the embodiments herein, any reference to direction or position, is only for the convenience of description, and cannot be understood as any limitation on the scope of protection of the present application. The following description of the preferred embodiments will involve the combination of features, which can exist independently or in combination, and the present application is not particularly limited to the preferred embodiments. The scope of the present application is defined by the claims.

[0047] As shown in Figures 1 to 4 , the present application proposes a double-line anti-static wristband monitoring device, the structure of the double-line anti-static wristband monitoring device is shown in Figure 2 , which comprises:

[0048] The double-line wristband is provided with an electrode for contacting the human wrist;

[0049] The wristband continuous monitor is connected with the double-line wristband through the adapter box, and the wristband continuous monitor host is used for monitoring the voltage state of the human wrist and releasing the voltage on the electrode of the double-line wristband;

[0050] The adapter box is used for adjusting the on-off state of the double-line wristband and the wristband continuous monitor host;

[0051] When the double-line wristband and the wristband continuous monitor host are in the disconnected state, the wristband continuous monitor host judges the insertion state of the wristband by using the adapter box.

[0052] The main function of the wristband continuous monitor is to judge whether the human body is in good contact with the wristband electrode by measuring the double-line wristband loop resistance, and the auxiliary function is to monitor the voltage of the human body, one source of which is the voltage source contacted by the human body due to misoperation. After the human body wears the anti-static wristband, the wristband is inserted into the adapter box, and the resistance of the wristband insertion end (B1 point, B2 point) is measured to judge whether the human body is in reliable contact with the two wristband electrodes. The static charge accumulated by the human body is discharged through the grounding path resistance of the wristband.

[0053] The wristband continuous monitor is a fixed end, and can be connected with multiple adapter boxes. The adapter boxes are arranged near the operators, the operators wear the double-line wristband, and then the double-line wristband is inserted into the adapter box. The wristband continuous monitor alarms when an abnormal condition is monitored.

[0054] The circuit of the double-line anti-static wristband monitoring device is shown in Figure 1 .

[0055] The wristband continuous monitor comprises a monitoring instrument applied voltage V0, a monitoring instrument applied voltage -V0, a resistance R1, a resistance R1', a resistance R2, a resistance R2', a grounding end, a C1 input end and a C2 input end.

[0056] One end of the resistance R1 is connected with the voltage output end of the voltage source V0.

[0057] The other end of the resistance R1 is connected with one end of the resistance R2 and the C1 input end.

[0058] The other end of the resistance R2 is connected with one end of the resistance R2', the G1 input end and the grounding end.

[0059] The other end of the resistance R2' is connected with one end of the resistance R1' and the C2 input end.

[0060] The other end of the resistance R1' is connected with the voltage output end of the voltage source -V0.

[0061] The resistance R1 and the resistance R1' have equal resistance values, and the resistance R2 and the resistance R2' have equal resistance values.

[0062] In the present application, the voltage V0 and the voltage -V0 are applied in the wristband continuous monitor, so that the whole circuit is in a charged working state, and the situation of the human wrist and the double-line wristband can be monitored through the parameters of the circuit.

[0063] The adapter box comprises a C1 output end, a C2 output end, a G1 output end, a B1 input end and a B2 input end.

[0064] When the adapter box is connected with the double-line wristband, the B1 input end is connected with the C1 output end.

[0065] The B2 input end is connected with the C2 output end.

[0066] When the adapter box is disconnected with the double-line wristband, the G1 output end is connected with the C1 output end.

[0067] The C1 output end is adapted with the C1 input end, the C2 output end is adapted with the C2 input end and the G1 output end is adapted with the G1 input end.

[0068] The circuit equivalent diagram of the adapter box is shown in Figure 1 When the adapter box is not inserted into the socket, the C1 point is connected with the G1 point due to the elasticity. Figure 4 When the double-line wristband is inserted into the adapter box, the C1 point is connected with the B1 point and the C2 point is connected with the B2 point, and the circuit is shown in Figure 4

[0069] The double-line wristband further comprises a resistor R3 and a resistor R3'.

[0070] The two ends of the resistor R3 are connected with the B1 input end and an electrode contacting the human wrist respectively.

[0071] The two ends of the resistor R3' are connected with the B2 input end and another electrode contacting the human wrist respectively.

[0072] The resistor R3 and the resistor R3' have the same resistance.

[0073] The wristband continuous monitoring instrument further comprises an alarm circuit which generates an alarm signal according to the equivalent path resistance of the double-line anti-static wristband monitoring device, the externally applied voltage and the adapter box.

[0074] The wristband continuous monitoring instrument judges the condition of the adapter box according to the following formula:

[0075]

[0076] V1=0

[0077] Wherein, R a is the equivalent path resistance when the double-line wristband is not inserted, R1 is the resistance of the resistor R1, R2 is the resistance of the resistor R2, V0 is the output voltage of the voltage source V0, V1 is the voltage value of the C1 input end and V'1 is the voltage value of the C2 input end.

[0078] According to the above resistance R a ​V1, V'1 together judge whether the double-line wristband is not inserted or inserted but open circuit, at this time, no alarm is given.

[0079] The alarm circuit calculates the equivalent path resistance and the voltage applied externally to the human body according to the following formula, and alarms when the equivalent path resistance and the voltage applied externally to the human body exceed the threshold value;

[0080]

[0081] wherein R b is the equivalent path resistance when the double-line wristband is inserted, I3 is the current value at the input end of C1, I'3 is the current value at the input end of C2, V1 is the voltage value at the input end of C1, V'1 is the voltage value at the input end of C2, and V3 is the voltage applied externally to the human body.

[0082] When the double-line wristband is inserted into the adapter box, the equivalent circuit diagram is as shown in Figure 4 , when calculating the equivalent path resistance R b , reference can be made to Figure 3 , and the resistance R b is the sum of the resistance values of the resistances Rx and Ry.

[0083] When the human body contacts an external voltage source due to an accident, the human body will be electrified at this time, and an alarm must be given in time. The scheme of the present application can accurately calculate the equivalent path resistance under the condition of the external applied voltage V3, and can calculate the wristband path resistance and the contact voltage value in the case that the personnel accidentally touch the external voltage during the operation process.

[0084] As shown in Figure 4 , the interface of the wristband continuous monitor is connected with the grounding end of the double-line wristband, and the wrist of the personnel is connected with the electrode part of the wristband. B1 point and B2 point are two grounding points of the double-line wristband, A1 point and A2 point are two wristband electrodes of the double-line wristband, and A3 point is another point of the human body. In the figure. The voltage V0 and -V0 applied internally by the wristband continuous monitor are a small voltage with opposite polarity and the same amplitude. Because the resistance R1 and the resistance R1' have equal resistance values, the resistance R2 and the resistance R2' have equal resistance values, and the resistance R3 and the resistance R3' have equal resistance values, due to the symmetry of the circuit, the voltages V1, V1' at B1, B2 points and the voltages V2, V2' at A1, A2 points are also opposite in polarity and the same in amplitude. At the same time, the human body can also be considered to be symmetrical, so it can be considered that the resistances R5 and R6 have equal resistance values, and the voltage presented by A3 point to the outside is 0. Thus, in the working of the circuit, the voltage of any other point of the human body is 0. The resistances R2, R3 and the resistances R2', R3' realize two grounding paths, which are used to discharge the static electricity generated by the human body.

[0085] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A dual wire anti-static wristband monitoring device, characterized by, The application relates to a double-wire wristband, a wristband continuous monitoring device and a double-wire wristband monitoring device. The double-wire wristband is provided with electrodes for contacting the human wrist. The wristband continuous monitoring device is connected with the double-wire wristband through an adapter box, the wristband continuous monitoring device is used for monitoring the voltage state of the human wrist, and the voltage on the electrodes of the double-wire wristband is released. The adapter box is used for adjusting the on-off state of the double-wire wristband and the wristband continuous monitoring device. When the double-wire wristband is disconnected with the wristband continuous monitoring device, the wristband continuous monitoring device judges the insertion state of the wristband through the adapter box. The adapter box comprises a C1 output end, a C2 output end, a G1 output end, a B1 input end and a B2 input end. When the double-wire wristband is not inserted into the adapter box, the C1 point and the G1 point are connected together. When the double-wire wristband is inserted into the adapter box, the C1 point and the B1 point are communicated, and the C2 point and the B2 point are communicated. The wristband continuous monitoring device further comprises an alarm circuit. The alarm circuit generates an alarm signal according to the equivalent path resistance of the double-wire wristband monitoring device and the externally applied voltage of the human body.

2. The double-wire wristband monitoring device according to claim 1, wherein The wristband continuous monitoring device comprises a monitoring device applied voltage V0, a monitoring device applied voltage -V0, a resistor R1, a resistor R1', a resistor R2, a resistor R2', a ground end, a C1 input end and a C2 input end. The voltage output end of the voltage source V0 is connected with one end of the resistor R1. The other end of the resistor R1 is connected with one end of the resistor R2 and the C1 input end. The other end of the resistor R2 is connected with one end of the resistor R2', the G1 input end and the ground end. The other end of the resistor R2' is connected with one end of the resistor R1' and the C2 input end. The other end of the resistor R1' is connected with the voltage output end of the voltage source -V0.

3. The double-wire wristband monitoring device according to claim 2, wherein When the adapter box is connected with the double-wire wristband, the B1 input end is connected with the C1 output end.

4. The dual wire anti-static wristband monitor of claim 3, wherein, The B2 input end is connected with the C2 output end. When the adapter box is disconnected with the double-wire wristband, the G1 output end is connected with the C1 output end. The C1 output end is matched with the C1 input end, the C2 output end is matched with the C2 input end, and the G1 output end is matched with the G1 input end.

5. The dual wire anti-static wristband monitoring device of claim 2 or 3, wherein, The double-wire wristband further comprises a resistor R3 and a resistor R3'. wherein R a is the equivalent resistance of the double-line wristband when not inserted, R1 is the resistance value of the resistor R1, R2 is the resistance value of the resistor R2, V0 is the output voltage of the voltage source V0, V1 is the voltage value at the input of C1, is the voltage value at the input of C2.

6. The dual wire anti-static wristband monitoring device of claim 2 or 3, wherein, The two ends of the resistor R3 are respectively connected with the B1 input end and one electrode contacting the human wrist. The two ends of the resistor R3' are respectively connected with the B2 input end and the other electrode contacting the human wrist. The wristband continuous monitoring device judges the adapter box according to the following formula: The alarm circuit calculates the equivalent path resistance and the externally applied voltage of the human body according to the following formula, and alarms when the equivalent path resistance and the externally applied voltage of the human body exceed the threshold value. wherein R b is the equivalent path resistance of the double-line wristband at the time of insertion, I3 is the current value of the C1 input end, is the current value of the C2 input end, V1 is the voltage value of the C1 input end, is the voltage value of the C2 input end, and V3 is the voltage applied externally to the human body.

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