Human electrostatic discharge circuit and its application
The electrostatic discharge circuit, constructed using a voltage-controlled variable resistor unit or a field-effect transistor, solves the problem of sparks and electric shocks generated by the human body electrostatic discharge ball in flammable and explosive environments, achieving rapid and safe electrostatic discharge and meeting intrinsic safety standards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 吴东辉
- Filing Date
- 2020-02-14
- Publication Date
- 2026-07-21
AI Technical Summary
Existing electrostatic discharge balls may generate discharge sparks and electric shock sensations when used in flammable or explosive environments, posing a safety hazard.
The electrostatic discharge circuit, which uses a voltage-controlled variable resistor unit or a field-effect transistor, controls the voltage change to reduce the resistance, thereby achieving rapid and safe release of static electricity from the human body. The circuit is made of semiconductor materials and includes resistors, capacitors, and field-effect transistors to ensure that there are no sparks or electric shocks under limited discharge power.
It enables the rapid and safe release of static electricity from the human body in flammable and explosive environments, avoiding static sparks and electric shocks, and meeting the intrinsic safety requirements of GB3836.4—201 standard.
Smart Images
Figure CN111278202B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of static electricity discharge and elimination in the human body, and in particular to a static electricity discharge circuit for the human body and its application. Background Technology
[0002] Currently, human body static discharge balls are used in flammable, explosive, and anti-static environments to release static electricity from the human body. Also known as human body static elimination balls, these balls are products suitable for releasing static electricity in flammable, explosive, and anti-static environments. Their main purpose is to safely discharge the static charge accumulated on the human body in flammable, explosive, and anti-static areas, preventing fires, explosions, electric shocks, and reducing static damage to electronic components caused by static electricity.
[0003] However, existing human static electricity discharge balls are made of stainless steel. The ball (touch ball) is connected to the ground. When the hand touches the ball, the static electricity of the human body is quickly introduced to the ground. During this process, a discharge spark may be generated the moment the hand touches the ball. This spark is unsafe in flammable and explosive places. In addition, the human body will also feel an electric shock and experience discomfort.
[0004] The electrostatic discharge circuit in this case is specifically designed for the field of static electricity elimination. It requires a certain high resistance (50 megohms to 1000 megohms) in its normal state and a rapid decrease in resistance (0 megohms to 50 megohms) after being touched. Summary of the Invention
[0005] Intrinsic safety stems from the fact that, according to the GB3836.4-201 standard, explosion-proof electrical appliances are classified into flameproof, increased safety, and intrinsically safe types. The characteristic of intrinsically safe electrical equipment is that all its circuits are intrinsically safe circuits, meaning that the electrical sparks and thermal effects generated under normal operation or specified fault conditions cannot ignite a specified explosive mixture. In other words, this type of electrical appliance is not protected by its casing or filling material; rather, the energy of the electrical sparks or thermal effects generated by its circuits during normal use or a fault is less than 0.28 mJ, which is the minimum ignition energy at a gas concentration of 8.5% (the most easily explosive concentration).
[0006] The purpose of this invention is to provide a human body static electricity discharge circuit. This circuit is connected to a grounded metal object, and static electricity is released by touching the contact point of the circuit with a hand, without generating contact sparks or causing an electric shock during the discharge process. The static electricity discharge process requires no sparks, no electric shock, and the discharge time cannot be too long. Based on Q (charge) = U (voltage) * C (capacitance) and I (current) = U (voltage) / R (resistance), and considering that the human body's capacitance is typically a fixed value, a discharge resistor is set to avoid instantaneous discharge, thus limiting the discharge power P = U. 2 / R (discharge power decreases rapidly with the square of the voltage), but with a constant resistance, as the charge decreases, the voltage also decreases, the discharge current decreases, and the discharge time increases. This is because the discharge power decreases rapidly with the square of the voltage (P=U). 2 If a discharge power is limited, the resistance must decrease rapidly to achieve fast discharge. Therefore, this solution maintains a certain high resistance (50 megohms to 1000 megohms) at the beginning and requires the resistance to decrease rapidly (0 megohms to 50 megohms) after being touched, thus meeting the requirements of fast and safe static electricity discharge.
[0007] According to the discharge time constant T=RC, under a certain C, the larger the resistance, the longer the discharge time is required. However, if the resistance is too small, the discharge power is large and sparks are easily generated. Therefore, the solution to this problem is variable resistance discharge.
[0008] The technical solution of this invention is: A human body static electricity discharge circuit is characterized by comprising a voltage-controlled rheostat (VCR) unit, a resistor R, and a capacitor C. The resistance across the VCR unit is controlled by the voltage on the control electrode G. One end of the VCR unit is grounded, and the other end is a touch terminal. The resistor R and capacitor C are connected in series to form an RC charging circuit. When a hand touches the touch terminal, the static electricity from the human body charges the capacitor C through the resistor R. As the voltage on the control electrode G increases, the resistance between the two electrodes of the VCR unit decreases, and the static electricity from the human body is discharged through the VCR unit, achieving rapid and safe release of static electricity from the human body under a limited discharge power condition.
[0009] A human body static electricity discharge circuit is characterized by being made of semiconductor material and including a source (S), a gate (G), a drain (D), a source (S), a gate (G), a drain (D), a resistor between the gate and G, and a capacitance between the gate and the source (S). When a hand touches the drain (D), the static electricity from the human body charges the capacitance between the gate and the source (S) through the resistor between the drain (D) and the gate (G). As the voltage of the gate (G) increases, the resistance between the drain (D) and the source (S) decreases, and the static electricity from the human body discharges through the decreasing resistance between the drain (D) and the source (S), thus achieving rapid and safe discharge of static electricity from the human body under limited discharge power conditions.
[0010] A human body static electricity discharge circuit is characterized by comprising a field-effect transistor (FET), a resistor R, and a capacitor C. The resistor R is connected between the drain D and the gate G of the FET, and the capacitor C is connected between the gate G and the source S of the FET. When a hand touches the drain D, the static electricity of the human body charges the capacitor C through the resistor R. As the voltage of the gate G increases, the resistance between the drain D and the source S decreases, and the static electricity of the human body is discharged through the decreasing resistance between the drain D and the source S, thereby achieving rapid and safe release of static electricity of the human body under a limited discharge power condition.
[0011] The aforementioned electrostatic discharge circuit for the human body is characterized by an RC constant of 1 to 10 seconds.
[0012] The aforementioned electrostatic discharge circuit for the human body is characterized by having a resistor of 100 megohms to 1000 megohms connected between switches D and S.
[0013] The electrostatic discharge circuit for human body is characterized in that: the electrostatic discharge circuit is disposed on an adhesive label to form an instant sticker.
[0014] The application of the electrostatic discharge circuit is characterized in that: the electrostatic discharge circuit is installed on the outer casing of the fuel dispenser to release static electricity from the human body.
[0015] The application of the electrostatic discharge circuit is characterized in that: the electrostatic discharge circuit is installed on the nozzle of the fuel dispenser to release static electricity from the human body.
[0016] The application of the electrostatic discharge circuit is characterized in that: the electrostatic discharge circuit is installed on the handle of the refueling nozzle to release static electricity from the human body.
[0017] The application of the electrostatic discharge circuit is characterized in that: the electrostatic discharge circuit is installed on the door handle to release static electricity from the human body.
[0018] The application of the electrostatic discharge circuit is characterized in that: the electrostatic discharge circuit is set in the electrostatic discharge ball circuit to release static electricity from the human body.
[0019] The beneficial effects of this invention are: no electrostatic sparks are generated when this circuit and its products are used, and no electric shock is generated to people during the release of static electricity from the human body, thus achieving rapid and safe release of static electricity from the human body under limited discharge power conditions. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the present invention.
[0021] Figure 2 This is the circuit diagram of the field-effect transistor of the present invention.
[0022] Figure 3 This is a schematic diagram illustrating the change of resistance over time in this invention.
[0023] Figure 4 This is a schematic diagram showing the change of discharge current over time in this invention.
[0024] Figure 5 This is an embodiment of the present invention of self-adhesive stickers.
[0025] Figure 6 This is an implementation scheme of the present invention applied to a gas station.
[0026] Figure 7 This is an embodiment of the invention applied to a refueling nozzle.
[0027] Figure 8 This is an embodiment of the invention applied to a door handle.
[0028] Figure 9 This is an embodiment of the present invention applied to an electrostatic release ball. Detailed Implementation
[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0030] Figure 1 The schematic diagram of this invention shows that circuit 1000 includes a voltage-controlled rheostat (VCR) 101, a resistor R, and a capacitor C. The resistance across the VCR 101 is controlled by the voltage on the control electrode G. One end of the VCR is grounded, and the other end is a touch terminal 102. The resistor R and capacitor C are connected in series to form an RC charging circuit. When a hand touches the touch terminal 102, static electricity from the human body charges the capacitor C through the resistor R. As the voltage on the control electrode G increases, the resistance between the two electrodes of the VCR decreases, and the static electricity from the human body is discharged through the VCR, achieving rapid and safe release of static electricity from the human body under limited discharge power conditions. This invention can be implemented at the chip level or as a device. Chip-level implementation means directly fabricating the VCR material or VCR chip array using semiconductor processes.
[0031] Figure 2 The circuit diagram of the field-effect transistor (FET) of this invention includes a FET, a resistor R, and a capacitor C. Resistor R is connected between the drain (D) and gate (G) of the FET, and capacitor C is connected between the gate (G) and source (S) of the FET. When a hand touches the drain (D), static electricity from the human body charges capacitor C through resistor R. As the gate voltage (G) increases, the resistance between the drain (D) and source (S) decreases, allowing static electricity to discharge quickly and safely under limited discharge power. The diagram shows an N-MOS transistor; similarly, a P-MOS transistor can be derived. When the source metal of the FET is connected to the substrate, the source and drain can be interchanged with minimal change in characteristics. The source and drain of the FET are structurally symmetrical and interchangeable. The gate-source voltage of a depletion-type MOS transistor can be positive or negative.
[0032] Figure 3This is a schematic diagram illustrating the resistance change over time in this invention. It is assumed that the maximum resistance between the drain and source (DS) terminals of the field-effect transistor (FET) is Rmax. In practice, the DS resistance of the FET can be very large. In this application, a resistor of 100 megohms to 1000 megohms can be connected across the DS terminals. When a person with static electricity touches the touch terminal, the static electricity charges the capacitor C through the resistor R. The charging follows an RC charging curve. The DS resistance decreases as the gate voltage G increases, which can be converted to time T. Assuming the ideal final resistance value is 0 after the touch, a represents a linear decrease over time, b represents a slow decrease over time, and c represents a rapid decrease over time. Since the discharge power P = U... 2 / R (discharge power decreases rapidly with the square of the voltage). If a discharge power is selected, the resistance must decrease rapidly to discharge quickly. The c curve conforms to the resistance change curve of RC charging. By selecting the RC value, the discharge power is made to be less than the safe value. The safe value means that no electrostatic sparks are generated and no electric shock is generated to the human body.
[0033] Figure 4 This is a schematic diagram of the discharge current changing with time in this invention. Ideally, the initial resistance is infinitely large, that is, the current is 0 at the beginning, and then it reaches a safe maximum value Imax (the safe maximum value is the maximum current that does not produce sparks or electric shock). After time T, the current is 0. In reality, the initial current is determined by the resistance between D and S or the bridging resistance Imin, and then it reaches the maximum value Imax. After time T, the current is 0.
[0034] Figure 5 In an embodiment of the present invention, the chip or circuit of the present invention is placed on a conductive substrate 601. The conductive substrate can be made of conductive rubber. 603 is a substrate protrusion. The protrusion of 603 exposes the conductive part of the conductive substrate 601 so that it can contact a grounded metal object. Pressure-sensitive adhesive 602 is coated on the substrate 601. Furthermore, conductive particles can be added to the composition of the pressure-sensitive adhesive of the self-adhesive to make a conductive pressure-sensitive adhesive. The pressure-sensitive adhesive is covered with a protective paper 604. The protective paper is also known as release paper, isolation paper, anti-sticking paper, or silicone paper. It is an anti-sticking paper that prevents the prepreg from sticking together and protects the prepreg from contamination.
[0035] Figure 6 In an embodiment of this invention applied to a gas station, 801 is a fuel dispenser, and 803 is a fuel nozzle. An adhesive sticker 802 of this invention is affixed to the metal casing of the fuel dispenser to release static electricity from the human body. Additionally, existing self-service fuel dispensers have a grounded metal keyboard 804; static sparks may occur when fingers touch the keyboard. Therefore, the product of this invention can be covered on the keyboard. Of course, the product of this invention can be made into a chip or embedded in a circuit.
[0036] Figure 7In an embodiment of the present invention applied to a refueling nozzle, the circuit or chip 1000 of the present invention is provided on the refueling nozzle 803, which can be provided on the nozzle 902 or on the handle 901.
[0037] Figure 8 In the embodiment of the present invention applied to door handles, considering that people's hands are often shocked by static electricity when touching door handles in winter, the product 1000 of the present invention is set on the door handle 1001 to prevent the human body from being shocked by static electricity. The door handle naturally includes car door handles.
[0038] Figure 9 In the embodiment of the present invention applied to the electrostatic discharge ball, 2000 is the touch ball of the electrostatic discharge ball. The touch end of the circuit of the present invention is connected to the touch ball, and the static electricity of the human body is released by touching it with a human hand.
[0039] Currently, static electricity elimination in the human body uses static discharge balls. However, since these balls are made of metal, touching them with a finger may generate static sparks, posing a safety hazard in flammable and explosive environments, and also causing an electric shock. Other methods use touch balls made of sub-conductive materials (industry standard SY / T7354-2017, resistance 10 megohms to 1000 megohms) to reduce the instantaneous static discharge energy and decrease the electric shock sensation. However, this requires extending the static discharge time, and due to the resistance, it cannot completely release the static electricity carried by the human body. The circuit of this invention can achieve complete static electricity discharge from the human body without static sparks or electric shock sensation.
[0040] The product of this invention can be attached to any place where static electricity needs to be released, such as car doors, explosion-proof equipment, instruments, etc.
[0041] In addition, a glow discharge tube can be installed in the electrostatic discharge circuit to indicate the electrostatic discharge process (if explosion-proof requirements are met, such as using an explosion-proof neon bubble).
[0042] The above application modes and rules do not limit the basic features of the method and application of the present invention, nor do they limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A human body static electricity discharge circuit, characterized in that: It includes a voltage-controlled rheostat (VCR), a resistor R, and a capacitor C. The resistance across the VCR is controlled by the voltage on the control electrode G. One end of the VCR is grounded, and the other end is the touch terminal. The resistor R and capacitor C are connected in series to form an RC charging circuit. When a hand touches the touch terminal, static electricity from the human body charges the capacitor C through the resistor R. As the voltage on the control electrode G increases, the resistance between the two electrodes of the VCR decreases, and static electricity from the human body is discharged through the VCR, achieving rapid and safe release of static electricity from the human body under limited discharge power conditions.
2. A human body static electricity discharge circuit, characterized in that: Made of semiconductor materials, it includes a source (S), a gate (G), a drain (D), a resistor between the drain (D) and the gate (G), and a capacitance between the gate (G) and the source (S). When a hand touches the drain (D), static electricity from the human body charges the capacitance between the gate (G) and the source (S) through the resistor between the drain (D) and the gate (G). As the voltage of the gate (G) increases, the resistance between the drain (D) and the source (S) decreases, and static electricity from the human body is discharged through the decreasing resistance between the drain (D) and the source (S), achieving rapid and safe release of static electricity from the human body under limited discharge power conditions.
3. A human body static electricity discharge circuit, characterized in that: The device includes a field-effect transistor (FET), a resistor R, and a capacitor C. The resistor R is connected between the drain D and the gate G of the FET, and the capacitor C is connected between the gate G and the source S of the FET. When a hand touches the drain D, static electricity from the human body charges the capacitor C through the resistor R. As the voltage at the gate G increases, the resistance between the drain D and the source S decreases, and the static electricity from the human body is discharged through the decreasing resistance between the drain D and the source S, thus achieving rapid and safe release of static electricity from the human body under limited discharge power conditions.
4. A human body electrostatic discharge circuit according to claim 1, 2, or 3, characterized in that: The RC constant is 1~10 seconds.
5. A human body electrostatic discharge circuit according to claim 1, 2, or 3, characterized in that: A resistor of 100 megohms to 1000 megohms is connected between the drain and source terminals.
6. A human body electrostatic discharge circuit according to claim 1, 2, or 3, characterized in that: The electrostatic discharge circuit for human body is characterized in that: the electrostatic discharge circuit is disposed on an adhesive label to form an instant sticker.
7. The application of the electrostatic discharge circuit according to claim 1, 2, or 3, characterized in that: An electrostatic discharge circuit is installed on the outer casing of the fuel dispenser to discharge static electricity from the human body.
8. The application of the electrostatic discharge circuit according to claim 1, 2, or 3, characterized in that: The electrostatic discharge circuit is installed on the nozzle of the fuel dispenser to release static electricity from the human body.
9. The application of the electrostatic discharge circuit according to claim 1, 2, or 3, characterized in that: An electrostatic discharge circuit is installed on the handle of the fuel nozzle to discharge static electricity from the human body.
10. The application of the electrostatic discharge circuit according to claim 1, 2, or 3, characterized in that: An electrostatic discharge circuit is installed on the door handle to release static electricity from the human body.
11. The application of the electrostatic discharge circuit according to claim 1, 2, or 3, characterized in that: The electrostatic discharge circuit is set in the electrostatic discharge ball circuit to release static electricity from the human body.