JP6325907B2 - Static electricity generating gun - Google Patents

Description

  The present invention relates to a static electricity generating gun for applying a surge to an electronic device incorporating an electronic component to evaluate the electromagnetic environment resistance of the electronic device.

  An electronic device may malfunction, break down, or be destroyed by a sudden surge caused by static electricity.

  For example, when a person comes into contact with an electronic device, static electricity charged on the human body may suddenly flow into the electronic device and cause the electronic device to malfunction, break down, or be destroyed.

  For this reason, it is necessary to artificially generate a surge and examine the influence of the electronic device in advance. In the following, the method of static electricity test using a personal computer as an electronic device will be described.

  FIG. 5 is a schematic configuration diagram of the electrostatic test execution method. In the electrostatic test of a personal computer, as shown in FIG. 5, a personal computer 16 is interposed through an insulating sheet 12a as needed in the center of a wooden desk 14 whose upper surface is covered with a metallic (for example, copper plate) horizontal plate 12. The desk 14 is placed on a metal reference ground plate 18.

  In addition, a discharge resistance cable 20 including resistors R1 (470 kΩ) and R2 (470 kΩ) is connected to the horizontal plate 12 and the reference ground plate 18. The aforementioned personal computer 16 is supplied with power by an AC power cable 22.

  The static electricity generator 30 and the reference ground plate 18 are connected by a ground cable 31, and the high voltage generator 40 is connected by cables 42 and 43. This cable 42 is for the high voltage power supply Hv from the high voltage generator 40, and the cable 43 is for return.

  The aforementioned static electricity generating device 30 is disclosed in Patent Document 1. As shown in FIG. 6, the static electricity generating device 30 of Patent Document 1 includes a discharge chip 32 that is a discharge electrode of the static electricity generating device 30 that generates a surge, and a gun trigger 34. Moreover, the charging / discharging part 50 is provided in the inside. The charging / discharging unit 50 includes a charging resistor 51 for inputting a high voltage power source Hv from the high voltage generator 40, a high voltage relay 52 having a contact A, a contact B, and a COM contact C, a discharge resistor 53, A charge / discharge capacitor Co (for example, 150 pF) is provided.

  When the worker holds the static electricity generating device 30 and brings the discharge chip 32 close to the personal computer 16 and pulls the gun trigger 34, the high voltage relay 52 is repeatedly turned on and off several times within a certain time (for example, 1 second). For example, the contact B is switched to the contact A, and the contact A is switched to the contact B.

  When the high-voltage relay 52 is switched to the contact B, the high-voltage power supply Hv (2 kV, 3 kV,...) From the high-voltage generator 40 is connected to the charge / discharge capacitor Co via the COM contact C and the discharge resistor 53. And a parasitic capacitance Cs1 is generated.

  As the contact A is switched, the charge charged in the parasitic capacitance Cs1 flows as a current (Ics1) to the discharge chip 32, and the charge charged in the charge / discharge capacitor Co becomes a current (Ico). It flows to the discharge chip 32 via the discharge resistor 53 and the contact C. These become surges and are applied to the personal computer 16.

  The discharge current of this surge will be described. The discharge current is measured using a Faraday cage 60 as shown in FIG.

  The Faraday cage 60 has a ground plate with a current detection target 62 (hereinafter referred to as a Faraday cage ground plate 65). An oscilloscope 67 is placed inside, and the oscilloscope 67 is connected to the current detection target 62 by a coaxial cable 68.

  Then, when an operator holds the static electricity generator 30 and brings the discharge chip 32 into contact with the current detection target 62 of the Faraday cage ground plate 65 and pulls the gun trigger 34, a surge current flows. When this is measured with an oscilloscope 67, the waveform is as shown in FIG. This is referred to as a waveform of the static electricity generating gun current Ic.

  As shown in FIG. 8, the waveform of the static electricity generating gun current Ic shows that the charge initially charged in the parasitic capacitance Cs1 flows (hereinafter referred to as the initial peak current Ics1), and the charge charged in the charge / discharge capacitor Co is Since a current (hereinafter referred to as discharge current Ico) flows, the initial stage has a sharp peak waveform (waveform of initial peak current Ics1), and thereafter has a gentle waveform (waveform of discharge current Ico).

  The waveform of the electrostatic generation gun current Ic is 90% from 0.7 to 1.0 ns (0.8 ns) from the arrival point to after the energy reaches 10% in the waveform of the initial peak current Ics1. Yes.

  FIG. 8 shows that the initial peak current Ics1 reaches the maximum value (hereinafter referred to as the initial peak current maximum value Ics1max) at tn.

  On the other hand, the discharge current Ico reaches about 50% after 30 ns from the arrival point to. tm is a maximum value (hereinafter referred to as a discharge current maximum value Icomax), and these currents comply with the international standard IEC61000-4-2. This section from tn to tm is referred to as a vibration section ST.

  Further, details of the waveform of the static electricity generating gun current Ic will be described with reference to FIG.

  As shown in FIG. 9, after reaching the initial peak current maximum value Ics1max, the initial peak current Ics1 rapidly decreases and reaches the minimum value (hereinafter referred to as the initial peak current minimum value Ics1min) in the vibration section ST.

  Thereafter, the oscillation wave is based on the difference between the initial peak current minimum value Ics1min and the initial peak current maximum value Ics1max, and reaches the discharge current maximum value Icomax.

Utility Model Registration No. 2593951

  However, if the surge from the static electricity generating device 30 has a difference between the maximum initial peak current value Ics1max and the initial peak current minimum value Ics1min, the period is extremely short as shown in FIG. A high-level vibration waveform is generated, and this vibration waveform causes a malfunction of electronic equipment.

  The present invention has been made to solve the above problems, and an object of the present invention is to obtain a static electricity generating gun capable of generating a surge in which the initial peak current Ics1 does not rapidly decrease.

The present invention relates to an electrostatic generation gun that radiates a surge based on a high-voltage power supply Hv from a high-voltage generator to an electronic device incorporating an electronic component from a discharge electrode.
A charging resistor for inputting the high-voltage power supply Hv;
Switching means for inputting the high voltage power source Hv from the charging resistor to the input side and supplying the high voltage power source Hv to the COM contact by a switching operation, or supplying discharge power from the COM contact from the output side;
A discharge resistor having one connected to the COM contact of the switching means;
A charge / discharge capacitor having one connected to the other of the discharge resistors and the other connected to ground;
A charging current conductor having one connected to the charging resistor and the other connected to the input side of the switching means;
A hollow metal conductor having a cavity and passing the charge current conductor through the cavity;
One end is connected to the COM contact of the switching means, the other end is connected to the hollow metal conductor, and a longitudinal portion is formed between the one end and the other end substantially orthogonal to the central axis of the discharge electrode. And a parasitic current discharging conductor.

  As described above, according to the present invention, when the discharge electrode of the static electricity generating gun is brought close to or in contact with the target electronic device with the high voltage power supply Hv applied to the input side of the switching means, the high voltage power supply Hv is charged / discharged. As the capacitor is charged, a parasitic capacitance in the hollow brass is generated in the hollow metal conductor.

  At this time, since the hollow metal conductor and the parasitic current discharge conductor connected to the COM contact C of the switching means have a longitudinal portion substantially orthogonal to the central axis of the discharge electrode, A large parasitic capacitance is generated between the discharge conductor.

  Then, when the intercept of the switching means is switched to the output side, the initial peak current (Ics1) based on the parasitic capacitance between the electronic device and the first generated when the charge / discharge capacitor is charged, and the parasitic capacitance based on the parasitic capacitance (Cs2) A vibration-buffered static electricity generating gun current (Ip) composed of a current (Ics2) and a parasitic capacitance current (Icp) in the hollow brass based on the hollow metal conductor flows, and a discharge current (Ico) based on the charge / discharge capacitor flows.

  For this reason, in the initial stage of discharge, the current does not drop sharply due to the increase in capacitance compared to the conventional case, so the vibration waveform does not suddenly fall and rise. It is possible to prevent malfunctions that deviate from the above.

It is a schematic circuit and waveform verification block diagram of the static electricity generation gun of an embodiment. It is a connection block diagram of the specific circuit component of FIG. It is explanatory drawing of the vibration buffering static electricity generation gun current Ip. It is a detailed explanatory view of the waveform of vibration buffering static electricity generation gun current Ip. It is a schematic block diagram of the electrostatic test implementation method. It is a circuit diagram of the conventional static electricity generator 30. It is a measurement figure of discharge current. It is a wave form diagram explaining the outline of the waveform of the static electricity generation gun current Ic. It is detail drawing of the waveform of the conventional static electricity generation gun current Ic.

  FIG. 1 is a schematic circuit diagram and a waveform verification configuration diagram of an electrostatic generation gun according to an embodiment. FIG. 2 is a connection configuration diagram of specific circuit components of FIG. However, only main parts are shown in FIG.

  1 and 2, the description of the same reference numerals as those in FIGS. 6 and 7 is omitted. 1 and 2 show the discharge chip 32 in contact with the current detection target 62 of the Faraday cage ground plate 65 of the Faraday cage 60. FIG. In other words, the electronic device that is the evaluation target is simulated by the Faraday cage 60.

  As shown in FIG. 1, a static electricity generating gun 100 according to an embodiment includes a charging resistor 51, a high-voltage relay 52 (also referred to as switching means), a discharging resistor 53, and brass (hereinafter referred to as a hollow metal conductor). Brass 70), a ferrite portion 71 (also referred to as a magnetic body), a waveform shaping circuit 73, a lead wire 75 (also referred to as a conductor for discharging a parasitic current), a connection line 76, a charge / discharge capacitor Co, and the like. ing.

  One of the connection lines 76 is connected to the charging resistor 51, and the other is connected to a B contact (also referred to as an input side) of the high voltage relay 52. The connecting line 76 passes through a cavity of a hollow brass 70 which is a conductor. The hollow brass 70 has an inner diameter of about 5 to 9 mm (preferably 8 mm).

  One end of the lead wire 75 is connected to the COM contact C of the high-voltage relay 52, and the other end is connected to the hollow brass 70. The lead wire 75 (tin-plated wire) has a length of about 12 to 22 cm and a diameter of about 2 to 3 mm.

  Furthermore, the lead wire 75 is connected through the cavity of the ferrite portion 71 (a plurality of ferrites). Further, the contact A (also referred to as output side) of the high voltage relay 52 is connected to the waveform shaping circuit 73.

  These circuit components are actually connected as shown in FIG. As shown in FIG. 2, the discharge chip 32 is connected to the static electricity generating gun body 101 by a substantially tapered holder 90. A waveform shaping circuit 73 is provided inside the holder 90.

  In addition, a main circuit component mount 80 for installing main circuit components is formed inside the holder 90 in the subsequent stage.

  The main circuit component mount 80 is a flat table that is substantially perpendicular to the central axis 32 a of the discharge chip 32.

  Then, the lead wire 75 with the ferrite portion 71 is put on the main circuit component mount 80. The lead wire 75 is provided on the upper part of the main circuit component mount 80 in a substantially U shape and is parallel to the current detection target 62.

  That is, by making as many longitudinal regions as possible parallel to the current detection target 62 as much as possible, a parasitic capacitance Cs2 as large as possible can be obtained.

  The contact A of the high voltage relay 52 and the discharge chip 32 are connected by a connection terminal 82. The connection terminal 82 is molded because it supplies the high-voltage power supply Hv (2 kV, 3 kV,...) To the discharge chip 32.

  One of the lead wires 75 (also referred to as one end) is connected to a terminal 82 (also referred to as the other end) provided on the main circuit component mount 80, and this terminal 82 is connected to the COM contact C of the high-voltage relay 52 by the connection line 84. It is connected.

  The other end of the lead wire 75 is connected to a terminal 86 provided on the main circuit component mount 80, and this terminal 86 is connected to the hollow brass 70 by a connection line 87.

  Further, the COM contact C of the high voltage relay 52 is connected to one of the discharge resistors 53 by a connection line 88, and the other of the discharge resistors 53 is connected to one of the charge / discharge capacitors Co.

  The other of the charge / discharge capacitor Co is connected to the ground cables 31 and 43 by a connection line 89. The ground cables 31 and 43 and the connection line 89 are connected by a connection terminal 96.

  Further, the connection line 76 passing through the cavity of the hollow brass 70 connected to the contact B of the high-voltage relay 52 is connected to the charging resistor 51, and the other end of the charging resistor 51 is connected to the cable 42 by the connection line 97. Yes. The connection line 97 and the cable 42 are connected by a connection terminal 99. Each of the connection wires and the lead wires 75 described above are covered with silicon.

(Description of operation)
The operation of the static electricity generating gun 100 configured as described above will be described below. In the present embodiment, it is assumed that the operator holds the discharge chip 32 in contact with the current detection target 62 of the Faraday cage ground plate 65 by holding the static electricity generator 30, and the high voltage relay 52 is switched to the contact B. State.

  That is, the high voltage power supply Hv (2 kV, 3 kV,...) From the high voltage generator 40 charges the charge / discharge capacitor Co via the COM contact C and the discharge resistor 53. At this time, a parasitic capacitance Cs1 is generated. Further, since the lead wire 75 is connected to the COM contact C of the high-voltage relay 52 and the hollow brass 70, a parasitic capacitance (hereinafter referred to as a hollow brass parasitic capacitance Cp) is generated in the hollow of the hollow brass 70.

  Further, as shown in FIG. 2, since the lead wire 75 is parallel to the current detection target 62 and the Faraday cage ground plate 65, the facing area increases in the longitudinal direction. For this reason, the charge accumulated in the parasitic capacitance (hereinafter referred to as lead-to-parasitic capacitance Cs2) generated between the lead wire 75 and the current detection target 62 and the Faraday cage ground plate 65 also increases.

  When the worker pulls the gun trigger 34 of the static electricity generator 30, the intercept of the high voltage relay 52 is switched to the contact A.

  Along with this switching, the charge charged in the parasitic capacitor CS1 becomes the initial peak current Ics1 and flows to the discharge chip 32 via the waveform shaping circuit 73, and the charge in the lead-to-parasitic capacitor Cs2 is a current (hereinafter referred to as lead wire). The parasitic capacitance current Ics2), and the lead 75, the COM contact C of the high-voltage relay 52, the intercept, the contact A, the waveform shaping circuit 73, the discharge chip 32, the current detection target 62, and the Faraday cage ground plate 65. The current flows through the current detection target 62 and the ground cable 31.

  At the same time, since the lead wire 75 is connected to the hollow brass 70 and the high-voltage relay 52, the parasitic capacitance Cp in the hollow brass generated in the hollow of the hollow brass 70 is a current (hereinafter referred to as a parasitic capacitance current Icp in the hollow brass). This is added to the lead-to-parasitic capacitance current Ics2.

  At this time, since the lead wire 75 is passed through the cavity of the ferrite portion 71 made of a plurality of ferrites, a very high harmonic component is removed.

  At the same time, the charge of the parasitic capacitance Cc1 generated by charging the charge / discharge capacitor Co becomes the initial peak current Ics1, and the waveform shaping circuit 73, the discharge chip 32, the current via the high voltage relay 52, the intercept, and the contact A. It flows through the detection target 62, the current detection target 62 of the Faraday cage ground plate 65, and the ground cable 31.

  Then, the electric charge charged in the charge / discharge capacitor Co becomes the discharge current Ico, the waveform shaping circuit 73, the discharge chip 32, the current detection target 62, the Faraday cage ground plate 65, the ground cable via the discharge resistor 53 and the contact C. It flows to the ground via 31 and 43.

  These currents are collectively referred to as vibration-buffered static electricity generating gun current Ip. A current waveform obtained by measuring and analyzing the vibration buffering static electricity generating gun current Ip with the oscilloscope 67 via the cable 68 will be described with reference to FIG.

  As shown in FIG. 3, the vibration buffering static electricity generating gun current Ip is composed of a discharge current Ico, an initial peak current Ics1, a lead wire-to-parasitic capacitance current Ics2, and a parasitic capacitance current Icp in the hollow brass.

  In other words, the parasitic capacitance current Icp of the parasitic capacitance Cp in the hollow brass generated in the hollow brass 70 and the lead wire to the parasitic current flowing through the lead wire 75 parallel to the current detection target 62 and the Faraday cage ground plate 65. The capacity current Ics2 is added to the initial peak current Ics1 and the discharge current Ico, and in the vibration section ST, the capacitance current Ics2 is not rapidly decreased as compared with the conventional case.

  Further, details of the waveform of the vibration buffering static electricity generating gun current Ip will be described with reference to FIG. As shown in FIG. 4, the first current in the oscillation section ST of the current (hereinafter referred to as the smooth initial peak current Ips) composed of the initial peak current Ics1, the lead pair parasitic capacitance current ICs2, and the parasitic capacitance current in the brass brass Icp in the initial stage. The falling point (hereinafter referred to as a smooth initial peak current initial falling point Ipsmin) is higher than the conventional initial peak current minimum value Ics1min.

  That is, the difference between the initial peak point of the smoothed initial peak current Ips (hereinafter referred to as the smoothed initial peak current maximum value IP1max) and the smoothed initial peak current initial falling point Ipsmin is smaller than that of the prior art.

  Therefore, since the amplitude of the vibration waveform in the vibration section ST is reduced, it is possible to generate a surge that can prevent a phenomenon of malfunction of the electronic device.

  The hollow brass 70 in the above embodiment may be a shield wire, iron, copper, aluminum, or the like.

  In the above embodiment, a personal computer is exemplified as a device incorporating an electronic component, but it may be an automobile, a television, or the like. Furthermore, the lead wire 75 may be a wide copper plate.

  Further, although one high-voltage relay 52 is used as the switching means, it may be constituted by two high-voltage relays.

  For example, a high-voltage relay having a contact B and a COM contact C and a high-voltage relay having a contact A and a C0M contact C are used.

  Then, the contact B of one high-voltage relay is connected to the charging resistor 5 via the connection line 76, and the COM contact C of the high-voltage relay C is connected to the charge / discharge resistor 53 and the COM contact C of the other high-voltage relay. Connecting. Then, the contact A of the other high-voltage relay is connected to the discharge chip 32.

  Then, in preparation for the operation of the gun trigger 34, first, one high-voltage relay segment is switched to be connected to the contact B and the COM contact C, and then the other high-voltage relay segment is switched to the contact A and the COM. Switch to contact C. That is, each high voltage relay is switched alternately.

  Furthermore, although the parasitic current discharging conductor has been described as the lead wire 75, the lead wire 75 may be a plate-like conductor.

51 Input Resistor 52 High Voltage Relay 53 Charge / Discharge Resistor 70 Hollow Brass 71 Ferrite Portion 73 Waveform Shaping Circuit 75 Lead Wire Co Charge / Discharge Capacitor

Claims (4)

In an electrostatic generation gun that radiates a surge based on a high-voltage power source Hv from a high-voltage generator (40) to an electronic device incorporating an electronic component from a discharge electrode (32),
A charging resistor (51) for inputting the high voltage power supply Hv;
Switching means for inputting the high voltage power supply Hv from the charging resistor (51) to the input side and supplying the high voltage power supply Hv to the COM contact by a switching operation, or supplying discharge power from the COM contact from the output side;
A discharge resistor (53) having one connected to the COM contact of the switching means;
A charge / discharge capacitor (Co) having one connected to the other of the discharge resistors (53) and the other connected to the ground;
A connection line (76), one connected to the charging resistor (51) and the other connected to the input side of the switching means;
A hollow metal conductor (70) having a cavity through which the connecting line (76) is passed, and
One end is connected to the COM contact of the switching means, the other end is connected to the hollow metal conductor (70), and the gap between the one end and the other end is substantially the center axis of the discharge electrode (32). A static electricity generating gun comprising: a parasitic current discharge conductor (75) formed with orthogonal longitudinal portions.   The static electricity generating gun according to claim 1, wherein the parasitic current discharging conductor (75) is covered with a magnetic material.   3. The generation of static electricity according to claim 1, further comprising a gun trigger (34), wherein the switching means alternately switches the intercept of the switching means within a predetermined time by pulling the gun trigger (34). gun. The parasitic current discharging conductor (75) is:
4. The static electricity generating gun according to claim 1, wherein the static electricity generating gun is provided immediately after the discharge electrode (32) and on a flat table (80) orthogonal to the central axis. 5. .

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