CN114666982A - Two coaxial electrostatic generators for simulating metal discharge of human body - Google Patents
Two coaxial electrostatic generators for simulating metal discharge of human body Download PDFInfo
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- CN114666982A CN114666982A CN202210277095.6A CN202210277095A CN114666982A CN 114666982 A CN114666982 A CN 114666982A CN 202210277095 A CN202210277095 A CN 202210277095A CN 114666982 A CN114666982 A CN 114666982A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/182—Printed circuits structurally associated with non-printed electric components associated with components mounted in the printed circuit board, e.g. insert mounted components [IMC]
- H05K1/183—Components mounted in and supported by recessed areas of the printed circuit board
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0215—Grounding of printed circuits by connection to external grounding means
Abstract
The invention discloses two coaxial electrostatic generators for simulating metal discharge of a human body, wherein one coaxial electrostatic generator is based on IEC standard waveforms, and the other coaxial electrostatic generator is designed based on the impedance characteristics of real metal of the human body. The two coaxial electrostatic generators for simulating the metal discharge of the human body are realized at the PCB level and respectively comprise a high-voltage direct-current source, an equivalent circuit, a mercury switch and a waveform output SMA port. The high-voltage direct current source end is connected at both ends of the human equivalent capacitor, the mercury switch is connected between the tail end of the core equivalent circuit and the SMA connector, and the SMA connector can be connected to the port of the SMA high-speed circuit of the PCB of the tested equipment. The two coaxial electrostatic generators simulating the metal discharge of the human body accurately reproduce the electrostatic discharge current waveforms under different requirements, can be used for testing the electrostatic immunity protection performance of the electronic device at the PCB port of the tested equipment, and provides an effective standardized method for testing the performance of the electrostatic protection device at the equipment port.
Description
Technical Field
The embodiment of the invention relates to the technical field of electrostatic discharge immunity testing, in particular to two coaxial electrostatic generators for simulating metal discharge of a human body.
Background
Electrostatic Discharge (ESD) refers to a charge transfer phenomenon caused by objects having different electrostatic potentials coming close to each other or directly contacting each other. The injection current and radiation field generated by the electrostatic discharge can cause serious interference and even damage to the electronic device or system, so that the electronic product needs to be subjected to electrostatic immunity test before being produced in batch. The current standard in common use is IEC 61000-4-2. Wherein the test model for electrostatic discharge is a human metal model.
Although the IEC standard specifies an electrostatic testing method for simulating electrostatic discharge of a charged human body by using an electrostatic gun, the IEC standard is only directed to static testing of a system level, and does not specify relevant standards for testing the immunity of electrostatic discharge of a human body on a PCB board level. In addition, studies have shown that different electrostatic guns have different test results due to different lengths of grounding wires and irregular placement positions, and therefore, the design of the electrostatic generator needs to be further improved.
Disclosure of Invention
The inventor finds that the current electrostatic discharge test waveform is mainly generated by an electrostatic gun, the conventional design of commercial electrostatic guns at home and abroad embodies the waveform suggested by the international standard IEC61000-4-2, but the simulated real human body discharge scene is different from the IEC standard suggested waveform, so the invention designs two electrostatic generators simulating the metal discharge of the human body aiming at different situations. The two electrostatic generators are embedded in the PCB, an external reference metal layer of the SMA port is used as a reference ground, and the mercury switch is mounted, so that the generated waveform has better repeatability, and the two electrostatic generators can be used for the standardized test of the electrostatic immunity of the coaxial structure equipment port or the PCB level.
The embodiment of the invention provides the following technical scheme:
the device comprises two coaxial electrostatic generators for simulating metal discharge of a human body, wherein the two coaxial electrostatic generators for simulating metal discharge of the human body are respectively an electrostatic generator based on IEC standard and an electrostatic generator based on a real metal discharge scene of the human body, an equivalent circuit of the electrostatic generator based on the IEC standard is realized by an equivalent circuit of a double-exponential function conforming to the IEC standard, the IEC standard is IEC61000-4-2, and the equivalent circuit of the electrostatic generator based on the real metal discharge scene of the human body is established according to a real impedance test of the metal discharge scene of the human body;
the two coaxial electrostatic generators for simulating metal discharge of a human body comprise a high-voltage direct-current module, a core equivalent circuit, a mercury switch and an SMA output connector, the waveform generation platform is a printed circuit board, the high-voltage direct-current voltage source ends are connected to two ends of an equivalent capacitor of the human body, the mercury switch is connected between the tail end of the equivalent circuit and the SMA connector, and the SMA connector can be connected to a port of a device to be tested and is used for testing the electrostatic immunity of the port of the device;
two coaxial electrostatic generators simulating metal discharge of a human body are embedded in the printed circuit board, and an external reference metal layer of the SMA port is used as a reference ground, so that the influence of a ground wire on a test result is avoided, and the device can be conveniently used for the electrostatic immunity test of an equipment port of an actual coaxial structure.
Wherein, the core equivalent circuit, the mercury switch and the SMA connector are welded on the circuit board.
The mercury switch is a magnetic control switch, and the on-off of the mercury switch is controlled by a magnetic element.
The upper microstrip line and the lower stratum near the mercury switch of the static generator based on the IEC standard form a parasitic capacitor, and the parasitic capacitor is eliminated by removing part of copper in the stratum, so that the influence of the parasitic capacitor on the static generator is avoided.
The equivalent circuit of the electrostatic generator based on the real human body metal discharge scene can accurately describe the impedance parameters of the human body, and is established according to the impedance test of the human body.
Compared with the prior art, the technical scheme has the following advantages:
aiming at the defects of the existing electrostatic gun test standard and the grounding wire arrangement, the invention provides two coaxial electrostatic generators for simulating the metal discharge of a human body. The equivalent circuit of two coaxial electrostatic generators for simulating metal discharge of a human body is an equivalent circuit of a double-exponential function conforming to the IEC standard. The other is established based on the impedance parameters of a real human body, unlike most electrostatic generators. Two coaxial electrostatic generators simulating metal discharge of a human body are embedded in the printed circuit board, and external reference metal layers of the SMA ports are used as reference grounds, so that the influence of a ground wire on a test result is avoided, and the method can be conveniently used for the electrostatic immunity test of an actual coaxial structure.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions in the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the two coaxial electrostatic generators;
FIG. 2(a) is an equivalent circuit schematic diagram of the IEC standard static-based generator;
FIG. 2(b) is a comparison of measured impedance parameters of the IEC standard-based electrostatic generator and simulated impedance parameters of an equivalent circuit;
FIG. 3(a) is an equivalent circuit schematic diagram of an electrostatic generator based on a real human body metal discharge scene;
FIG. 3(b) is a comparison of actual measurement of the electrostatic generator and the equivalent circuit simulated impedance parameters based on a real human body metal discharge scene;
FIG. 4(a) is a discharge current waveform measured at 500V by the IEC standard electrostatic generator;
fig. 4(b) is a discharge current waveform measured at 500V by the IEC standard electrostatic based generator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The inventor finds that the current electrostatic discharge test waveform is mainly generated by an electrostatic gun, the traditional design of commercial electrostatic guns at home and abroad embodies the waveform suggested by the international standard IEC61000-4-2, but the real human body discharge and the waveform suggested by the IEC standard are different, so the invention designs two electrostatic generators aiming at different situations. Aiming at the defects of the existing electrostatic gun test standard and the grounding wire arrangement, the invention provides two coaxial electrostatic generators for simulating the metal discharge of a human body. The equivalent circuits of two coaxial electrostatic generators for simulating metal discharge of a human body are different from most of the electrostatic generators, wherein one equivalent circuit is an equivalent circuit of a double-exponential function conforming to the IEC standard, and the other equivalent circuit is established according to impedance parameters of a real human body. The two coaxial electrostatic generators are embedded in a Printed Circuit Board (PCB), and an external reference metal layer of a small waveform output connector (Sub-Miniature Version A, SMA) port is used as a reference ground, so that the influence of a ground wire on a test result is avoided, and the coaxial electrostatic immunity test method can be conveniently used for the actual electrostatic immunity test of a coaxial structure.
The two coaxial electrostatic generators simulating metal discharge of a human body are embedded in the PCB, the external reference metal layer of the SMA port is used as a reference ground, and the mercury switch is carried, so that the generated waveform has better repeatability, and the coaxial electrostatic generators can be used for the standardized test of the coaxial structure equipment port or the PCB level electrostatic immunity.
The embodiment of the invention provides the following technical scheme:
the two coaxial electrostatic generators for simulating the metal discharge of the human body are respectively based on an electrostatic generator of IEC standard and an electrostatic generator based on a real metal discharge scene of the human body, an equivalent circuit of the electrostatic generator of the IEC standard is realized by an equivalent circuit of a double-exponential function conforming to the IEC standard, the IEC standard is IEC61000-4-2, and the equivalent circuit of the electrostatic generator based on the real metal discharge scene of the human body is established according to a real impedance test of the metal discharge scene of the human body-hand-metal;
the two coaxial electrostatic generators for simulating metal discharge of a human body comprise a high-voltage direct-current module, a core equivalent circuit, a mercury switch and an SMA (shape memory alloy) output connector, a waveform generating platform is a printed circuit board, a high-voltage direct-current voltage source end is connected to two ends of an equivalent capacitor of the human body, the mercury switch is connected between the tail end of the equivalent circuit and the SMA connector, and the SMA connector can be connected to a port of a tested device and used for testing the electrostatic immunity of the port of the device;
two coaxial electrostatic generators simulating metal discharge of a human body are embedded in the printed circuit board, and an external reference metal layer of the SMA port is used as a reference ground, so that the influence of a ground wire on a test result is avoided, and the device can be conveniently used for the electrostatic immunity test of an equipment port of an actual coaxial structure.
Wherein, the core equivalent circuit, the mercury switch and the SMA connector are welded on the circuit board.
The mercury switch is a magnetic control switch, and the on-off of the mercury switch is controlled by a magnetic element.
The upper-layer microstrip line and the lower-layer stratum near the mercury switch of the static generator based on the IEC standard form a parasitic capacitor, and the parasitic capacitor is eliminated by removing part of copper in the stratum, so that the influence of the parasitic capacitor on the static generator is avoided.
The equivalent circuit of the electrostatic generator based on the real human body metal discharge scene can accurately describe the impedance parameters of the human body, and the equivalent circuit is established according to the impedance test of the human body.
The two coaxial electrostatic generators simulating the metal discharge of the human body both adopt SMA interfaces and can be used for testing the electrostatic immunity of the equipment port.
The static generator based on IEC standard is realized by a double-exponential function conforming to IEC standard, and the equivalent circuit of the static generator can be described as two RLC circuits.
The circuit model of the electrostatic generator based on the real human body metal discharge scene is established according to actual human body impedance parameter tests, and comprises three RLC circuits which are respectively equivalent to different parts of human body impedance parameters.
The high-voltage direct current source is an adjustable high-voltage direct current source, firstly is boosted through the high-voltage module, and then is charged for the human body equivalent capacitor through a large resistor.
The two coaxial electrostatic generators are connected with an SMA connector, can be connected to a waveform detection device or a tested device port, and can be used for electrostatic immunity testing of the coaxial ports.
The coaxial electrostatic generator has the following connection relationship: the high-voltage direct current source end is connected to two ends of an equivalent capacitor of a human body, and the equivalent capacitor of the human body is charged through a large resistor; the mercury switch is connected between the end of the equivalent circuit and the SMA connector. After the charging of the human equivalent capacitor is completed, the electrostatic discharge current waveform is released by closing the mercury switch and is connected to a waveform detection equipment port or a to-be-tested equipment port through the SMA joint, so that the method can be used for electrostatic immunity testing of a coaxial structure.
Compared with the prior art, the two coaxial electrostatic generators for simulating metal discharge of a human body accurately reproduce the actual electrostatic discharge current waveform. The electrostatic generator is simple in design and convenient and fast to build; the test device is embedded in the PCB, and an external reference metal layer of the SMA port is used as a reference ground, so that the influence of a ground wire on a test result is avoided, and the test device can be conveniently used for actual test; the mercury switch is carried, the sensitivity is high, the mercury on-off reed is filled in the mercury switch, the vibration is almost avoided, and the generated electrostatic discharge current waveform has better repeatability. The two coaxial electrostatic generators simulating the metal discharge of the human body can be used for the electrostatic immunity test of the coaxial structure, a new standard is provided for the immunity test of the coaxial structure, and the two equivalent circuits can be conveniently embedded into circuit simulation software to evaluate and predict the electrostatic discharge.
Fig. 1 is a schematic diagram of the actual structure of two coaxial electrostatic generators simulating the metal discharge of a human body, wherein the two coaxial electrostatic generators comprise a high-voltage direct-current source, a core equivalent circuit, a mercury switch and an SMA joint. The equivalent circuit, the mercury switch and the SMA connector are soldered on the printed circuit board. The two equivalent circuits are respectively established by a double-exponential function meeting IEC standard and impedance parameters of a real human body.
Specifically, the high-voltage direct-current source is 220V alternating-current voltage input and adjustable direct-current voltage output. Two direct current voltage sources are adopted, one supplies power to the high-voltage module, and the other is used for regulating output voltage. The output terminal of the high voltage is connected to both ends of the equivalent capacitance (C1 in fig. 2(a) or Cb1 in fig. 3) of the human body, and is charged through a large resistor.
Specifically, the mercury switch is a high-voltage magnetic control switch, the outer part of the mercury switch is packaged by a sealed glass tube, the inner part of the mercury switch is filled with mercury, and the switch can be controlled to be closed by using a magnetic material. The mercury switch is welded between the tail end of the equivalent circuit and the SMA connector, and when the equivalent capacitance of a human body is charged, the mercury switch is closed to release an electrostatic discharge current waveform.
In particular, the SMA connector can be connected to a waveform detection device or a device to be tested and can be used for electrostatic immunity testing of a coaxial structure.
Specifically, the equivalent circuit of the electrostatic generator based on the IEC standard may be implemented by a double-exponential function conforming to the IEC standard, and the equivalent circuit may be represented by two RLC circuits, as shown in fig. 2 (a). Wherein the relevant parameters are: c1 ═ 150pF, R1 ═ 150 Ω, L1 ═ 1.2uH, C2 ═ 16.5pF, R2 ═ 200 Ω, L2 ═ 110nH, and R3 ═ 50 Ω. The circuit composed of R1, C1, L1, R2 and L2 is used for generating a second peak current which rises slowly, the circuit composed of C2, R2 and L2 is used for generating a first peak current which rises quickly, and R3 is a load of the test system. Fig. 2(b) is a comparison of impedance parameters of the static generator measured by the vector network analyzer and the equivalent circuit simulation, the impedance parameters are consistent, and the accuracy of the manufactured static generator is proved on the frequency domain.
Specifically, parasitic capacitance is formed between an upper layer microstrip line and a lower layer of stratum near the mercury switch of the electrostatic generator based on the IEC standard, copper corresponding to the stratum is removed, and the influence of the parasitic capacitance on the output waveform of the electrostatic generator is avoided.
Specifically, the equivalent circuit of the electrostatic generator based on the real human body metal discharge scene is established by impedance parameters of a human body, and the impedance parameters of the human body can be measured by a vector network analyzer. The equivalent circuit modeling is performed by equivalent of each part of the human body to RLC elements, fig. 3(a) shows a schematic diagram of the equivalent circuit of the human body, which includes three RLC circuits, R1, L1 and C1 represent the whole human body, and are used for high frequency parts of the equivalent human body impedance parameter above 100MHz, and values of actually welded components are 130 Ω, 330nH and 100pF, respectively. R2, L2 and C2 represent the waist of the human body for the 10M-100MHz intermediate frequency part of the equivalent body impedance parameters, whose actual soldered component values are 180 Ω, 270nH and 20pF, respectively. R3, L3 and C3 represent arm parts of human body, are used for equivalent human body impedance parameter low frequency parts below 10MHz, and actually welded components and parts have values of 56 omega, 16nH and 13pF respectively. The established equivalent circuit can accurately describe the impedance parameters of the real human body. Fig. 3(b) shows the comparison between the impedance parameter actual measurement result of the electrostatic generator based on the real human body metal discharge scene and the equivalent circuit simulation result, and the impedance parameter actual measurement result and the equivalent circuit simulation result have better consistency, thereby proving the accuracy of the established equivalent circuit.
Fig. 4(a) and (b) are discharge current waveforms measured by the IEC standard-based electrostatic generator and the real human body metal discharge scene-based electrostatic generator at an output voltage of 500V, respectively. Of course, the input voltage may be between 500V and 2000V.
Specifically, the output end of the high voltage source is connected to two ends of the human equivalent capacitor in an actual test, after charging is completed, the switch is closed through the magnet, discharging current is released, and the high voltage source is connected to the oscilloscope through the SMA connector for displaying. The bandwidth of the oscilloscope is 2GHz, the sampling rate is 5GSa/s, and the discharge current waveforms of the two coaxial electrostatic generators are measured when the discharge voltage is 500V. The results are different since the load is not the IEC standard 2 Ω current target. The actually measured waveform of the static generator based on the IEC standard has a peak value of 1.76A and a rise time of about 0.9ns, meets the IEC standard, and the first peak value falls back mainly due to parasitic capacitance between a microstrip line under a mercury switch and a stratum. The peak value of the electrostatic generator based on the real human body metal discharge scene is 4.16A, the rise time is about 0.4ns, and the overall waveform is consistent with the human body discharge current waveform.
The two coaxial electrostatic generators for simulating metal discharge of the human body, provided by the invention, have simple structures and are convenient to realize, and the condition that the traditional electrostatic gun has different test results due to the non-standard length and placement position of the grounding wire is avoided. According to the proposed circuit model and parameter values, the novel electrostatic generator can embody the IEC standard and the electrostatic discharge characteristics of a real human body. Under the control of the mercury switch, the discharge current waveform generated by the mercury switch has better repeatability, can be conveniently used for the electrostatic immunity test of an electronic device or a system with a coaxial structure, and provides a new standard for the electrostatic immunity test of a PCB board-level coaxial structure.
The two coaxial electrostatic generators for simulating metal discharge of a human body are designed based on IEC standard waveforms and real metal impedance characteristics of the human body. The two coaxial electrostatic generators for simulating metal discharge of the human body are realized at the PCB level and respectively comprise a high-voltage direct current source, an equivalent circuit, a mercury switch and a waveform output SMA port. The high-voltage direct current source end is connected at both ends of the human equivalent capacitor, the mercury switch is connected between the tail end of the core equivalent circuit and the SMA connector, and the SMA connector can be connected to the port of the SMA high-speed circuit of the PCB of the tested equipment. The two coaxial electrostatic generators simulating the metal discharge of the human body accurately reproduce the electrostatic discharge current waveforms under different requirements, can be used for testing the electrostatic immunity protection performance of the electronic device at the PCB port of the tested equipment, and provides an effective standardized method for testing the performance of the electrostatic protection device at the equipment port.
In the description, each part is described in a progressive manner, each part is emphasized to be different from other parts, and the same and similar parts among the parts are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The device is characterized in that the two coaxial electrostatic generators for simulating the metal discharge of the human body are respectively an electrostatic generator based on IEC standard and an electrostatic generator based on a real metal discharge scene of the human body, an equivalent circuit of the electrostatic generator based on the IEC standard is realized by an equivalent circuit of a double-exponential function conforming to the IEC standard, the IEC standard is IEC61000-4-2, and the equivalent circuit of the electrostatic generator based on the real metal discharge scene of the human body is established according to a real impedance test of the metal discharge scene of the human body;
the two coaxial electrostatic generators for simulating metal discharge of a human body comprise a high-voltage direct-current module, a core equivalent circuit, a mercury switch and an SMA output connector, the waveform generation platform is a printed circuit board, the high-voltage direct-current voltage source ends are connected to two ends of an equivalent capacitor of the human body, the mercury switch is connected between the tail end of the equivalent circuit and the SMA connector, and the SMA connector can be connected to a port of a device to be tested and is used for testing the electrostatic immunity of the port of the device;
two coaxial electrostatic generators simulating metal discharge of a human body are embedded in the printed circuit board, and an external reference metal layer of the SMA port is used as a reference ground, so that the influence of a ground wire on a test result is avoided, and the device can be conveniently used for the electrostatic immunity test of an equipment port of an actual coaxial structure.
2. The method of claim 1, wherein the core equivalent circuit, the mercury switch, and the SMA connector are soldered to the circuit board.
3. The method of claim 1, wherein the mercury switch is a magnetically controlled switch, and a magnetic element is used to control the on/off of the mercury switch.
4. The method of claim 1, wherein the upper microstrip line and the lower ground layer near the mercury switch of the IEC standard-based electrostatic generator form a parasitic capacitance, and the parasitic capacitance is eliminated by removing a part of copper from the ground layer to avoid the influence of the parasitic capacitance on the electrostatic generator.
5. The method of claim 1, wherein the equivalent circuit of the electrostatic generator based on the real human body metal discharge scene can accurately describe the impedance parameters of the human body, which are established according to the impedance test of the human body.
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