JPH0963787A - Method and device for virtual grounding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the same condition with the grounding condition without really grounding by using an earth cable or the like, and to enable the measurement in the condition that a measuring equipment is placed on a moving body and the measurement in the condition that a portable measuring equipment is moved with a person in the case where the static electricity measuring equipment is used so as to measure the static electricity. SOLUTION: A guiding plate 29 is connected to an object B to be grounded so as to introduce the charge of the object B to be grounded to the guiding plate 29. This guiding plate 29 is irradiated with the ion from discharging electrodes 25, 26 so that the electric potential of the guiding plate 29 comes close to zero, and the object B to be grounded is thereby virtually grounded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a grounded object to be grounded (grounded) is in a situation where it cannot be practically grounded, or there is a problem in grounding using a ground wire or the like. In particular, the present invention relates to a virtual grounding method and a device thereof that can make a virtual grounding state equivalent to grounding.

[0002]

2. Description of the Related Art Conventionally, for example, to measure the static electricity of a charged object to be measured with an electrostatic measuring device (potential measuring device),
The measuring instrument is grounded using a grounding wire to set the grounding body as the reference potential. In this way, depending on the location, you may have to run the ground wire for a long time,
There were many problems in workability and safety such as difficulty in installing the ground wire due to obstacles. Further, since the ground wire was not simply prepared, the grounding could not be taken, and the measuring instrument itself had the same potential as the charged measuring object and could not be measured. Furthermore, even if the measuring instrument can be driven by a battery, etc., it is not possible to make measurements while the measuring instrument is placed on a moving object or while being carried by a person, because a ground wire is required. there were.

[0003]

SUMMARY OF THE INVENTION In view of such problems of the prior art, it is an object of the present invention to provide a state equivalent to being grounded without actually grounding it using a ground wire or the like. For example, when measuring static electricity using a static electricity measuring device, a virtual grounding method that enables measurement while the measuring device is placed on a moving object, or while a person carries it and moves. To provide the device.

[0004]

According to the virtual grounding method of the present invention, an induction plate is connected to a grounding object to induce a charge of the grounding object to the induction plate, and the induction plate is irradiated with ions from a discharge electrode. By bringing the induction potential of the induction plate close to zero potential, the ground object is virtually grounded. In this case, even if a common induction plate is irradiated with positive and negative ions from the positive and negative discharge electrodes, or a pair of induction plates are connected to the grounded object, positive and negative ions are connected to these induction plates from the positive and negative discharge electrodes. And may be separately irradiated.

The virtual grounding device of the present invention includes an induction plate connected to an object to be grounded, a pair of positive and negative discharge electrodes facing the induction plate, a high frequency transformer, and a primary side of the high frequency transformer. High-frequency oscillator circuit that is connected to the DC voltage source and oscillates by self-excitation, a positive-side voltage doubler rectifier circuit that positively rectifies and amplifies the secondary voltage of the high-frequency transformer and applies it to the positive-side discharge electrode, and a secondary voltage of the high-frequency transformer And a negative voltage doubler rectifier circuit for negatively rectifying, amplifying, and applying the negative voltage to the negative discharge electrode.

According to such a virtual grounding device, the electric charge of the grounding object is guided to the guide plate connected to the grounding target. On the other hand, the AC voltage of the self-oscillating high-frequency oscillation circuit is boosted by the high-frequency transformer, and is further rectified and amplified separately by plus and minus voltage doubler rectification circuit,
Positive and negative DC high voltages are applied to the positive and negative discharge electrodes, respectively. Since the ground object has a positive or negative polarity, electric charges having the same polarity as the ground object are induced in the guide plate. Of the positive and negative discharge electrodes, the discharge electrode with the opposite polarity to the induction plate is
Although the discharge is performed toward the induction plate, the discharge electrodes having the same polarity as the induction plate are in a state where the same polarity faces each other, so that the discharge is suppressed. Therefore, the induction potential of the guide plate is maintained at the same potential (zero potential) as the grounding body.

That is, when viewed from an equivalent circuit, when the induction plate and the discharge electrode have the same polarity, the virtual switch between the induction plate and the discharge electrode is turned off or the resistance is increased to suppress the discharge. , If the induction plate and the discharge electrode have opposite polarities,
A virtual switch between the induction plate and the discharge electrode is turned on or the resistance becomes small to cause discharge, and the ions due to the discharge neutralize the charge of the induction plate and the induction plate is discharged, and as a result, the induction plate is discharged. The charge will be removed regardless of whether the polarity of is positive or negative. Moreover, since the discharge from the plus / minus discharge electrodes changes according to the polarity and the potential of the induction plate, the ions are automatically balanced.
It is possible to virtually ground an object to be grounded by removing static electricity from the induction plate and bringing it closer to zero potential.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of the present invention. As shown in FIG. 1, a virtual grounding device A according to the present invention.
Is separate from the static electricity measuring device B. FIG. 2 shows the principle of a conventionally known vibration type static electricity measuring device B.
This static electricity measuring device B introduces a line of electric force from a part of the charged object to be measured X from a measurement window 1, changes it with a diaphragm 2 and detects it with a detection electrode 3, and detects the detected potential by an amplifier 4.
Amplify with and output. In the body of this static electricity detector B,
There is provided a grounding terminal 5 for grounding the diaphragm 2 and the reference electrode portion of the detection electrode 3 inside by external wiring.

The virtual grounding device A has an electric circuit as shown in FIG. The circuit configuration will be described. The insulating case 10 has an AC / D
A power jack 11 for connecting an external DC power source such as a C adapter and a battery on / off switch 13 for the internal battery 12 are provided, and the external DC power source and the internal battery 12 can be selectively used as power sources. It is like this.
That is, the battery on / off switch 13 is turned off when a plug from the external DC power supply is inserted into the power supply jack, and is turned on when the plug is not inserted.

A DC voltage from the external DC power source or the internal battery 12 is applied to the high frequency oscillation circuit 17 via the power switch 14, the variable resistor 15 and the fuse 16. The high-frequency oscillator circuit 17 is connected to the primary side of the high-frequency transformer 18, and when the start-up transistor 19 is turned on by applying a DC voltage, high-frequency oscillation is generated by self-excited oscillation. When this oscillates, a high AC voltage is obtained on the secondary side of the high frequency transformer 18, and the operation indicator lamp (light emitting diode) 20 is turned on.

A positive side double voltage rectifier circuit 21 and a negative side double voltage rectifier circuit 22 are connected in parallel to the secondary output terminal of the high frequency transformer 18. The positive voltage doubler rectifier circuit 21 is configured by connecting a diode D and a capacitor C in series in n stages (5 stages in the figure) in order to positively rectify and amplify the secondary voltage of the high frequency transformer 18 in n stages.
Further, the minus-side voltage doubler rectifier circuit 22 negatively rectifies and amplifies the secondary voltage of the high-frequency transformer 18 into m stages smaller than n, so that a diode D and a capacitor C are connected in series in m stages (4 stages in the figure). Is configured. The electric circuit as described above is mounted on the circuit board 23 in the insulating case 10 as shown in FIG.

On the insulating electrode base 24 installed in the insulating case 10, the positive and negative needle-shaped discharge electrodes 25 are provided.
26 are planted at intervals, the output end of the positive side voltage doubler rectifier circuit 21 is connected to the positive side discharge electrode 25 via the positive side current limiting resistor 27, and the negative side voltage doubler rectifier circuit 22. The output end of is connected to the negative side discharge electrode 26 via the negative side current limiting resistor 28. The discharge electrodes 25 and 26 are connected to the insulating case 10.
It faces the guide plate 29 installed therein at a predetermined interval. A conductor 31 is connected to the induction plate 29 via a current limiting resistor 30. The conductor 31 is drawn to the outside of the insulating case 10 to connect the virtual grounding device A to the grounding target.

Therefore, in measuring the potential of the object X to be measured by the static electricity measuring instrument B, if the conductor 31 is connected to the grounding terminal 5 of the static electricity measuring instrument B, the vibration plate 2 in the static electricity measuring instrument B and The electric charge of the reference electrode portion of the detection electrode 3 and further the measurement object X is induced to the induction plate 29 in the virtual grounding device A.

In this state, when the power switch 14 of the virtual grounding device A is turned on to oscillate the high frequency oscillating circuit 17, the light emitting diode 20 lights up and an AC voltage is generated on the secondary side of the high frequency transformer 18, The AC voltage is rectified and amplified in five stages in the plus side voltage doubler rectifier circuit 21, and is rectified and amplified in four stages in the minus side voltage doubler rectifier circuit 22, and the plus side DC voltage applied to the plus side discharge electrode 25 is The voltage is higher than the negative DC voltage applied to the negative discharge electrode 26. In this case, of the plus and minus discharge electrodes 25 and 26, the guide plate 29
The discharge electrode having a polarity opposite to that of the discharge electrode discharges the charge toward the guide plate 29 to eliminate the charge, but the discharge electrodes having the same polarity as the guide plate 29 are in the state where the same polarity faces each other, so that the discharge is suppressed. . The ions generated by ionization tend to be slightly more negative ions than positive ions, but the DC voltage applied to the positive and negative discharge electrodes 25 and 26 is higher on the positive side, so that the dielectric The ions acting on the plate 29 can be made equal to plus and minus, and the dielectric plate 29 can be discharged.

Therefore, regardless of whether the electric charge induced in the induction plate 29 is positive or negative, the induction plate 29 can be equally eliminated, so that the vibration plate 2 and the reference electrode portion of the detection electrode 3 in the static electricity measuring device B can be removed. It is possible to measure the potential of the measuring object X by the static electricity measuring device B by setting these potentials to zero potential to bring them into a virtual ground state and using this as a reference potential. Since the discharge between the discharge electrodes 25 and 26 and the guide plate 29 occurs in the insulating case 10, it is safe.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned configuration,
For example, the following forms are possible. The virtual grounding device according to the present invention includes a circuit as shown in FIG.
26 and the guide plate 29 may be incorporated into the main body of the static electricity measuring device B to be integrated with the static electricity measuring device B. Further, in the above embodiment, one guide plate 29 is commonly opposed to the plus / minus discharge electrodes 25/26, but the guide plate is opposed to each of the plus / minus discharge electrodes 25/26. You may let me. In this case, a common conductive wire may be connected to both the induction plates, but a conductor other than the conductive wire 31 can also induce charges. Further, the static electricity measuring device may be of a type other than the vibration type (for example, a current collecting type). Also, the object to be grounded is not limited to the static electricity measurement device, but it is desired to use a ground wire to ground it, but it can be widely used for grounding in equipment and moving bodies under circumstances where it cannot be done, or grounding of the human body. It is a thing.

[0017]

According to the present invention, it is possible to make a state equivalent to being grounded without actually grounding it by using a ground wire or the like. For example, when static electricity is measured using a static electricity measuring device. For example, it is possible to perform measurement while the measuring instrument is placed on a moving object, or while a person carries it and moves.

[Brief description of drawings]

FIG. 1 is a partially cutaway view of a state in which a virtual grounding device according to the present invention is connected to a static electricity measuring device.

FIG. 2 is a diagram showing a circuit configuration of a virtual grounding device and a principle configuration of an electrostatic measuring instrument in the above.

[Explanation of symbols]

 A virtual grounding device B static electricity measuring device 17 high-frequency oscillation circuit 18 high-frequency transformer 21 positive-side voltage doubler rectifier circuit 22 negative-side voltage doubler rectifier circuit 25/26 discharge electrode 29 induction plate

Claims (5)

[Claims] 1. A guide plate is connected to a ground object to induce a charge of the ground object to the guide plate, and the guide plate is irradiated with ions from a discharge electrode to bring the induced potential of the guide plate close to zero potential. By doing so, a virtual grounding method is characterized by virtually grounding an object to be grounded. 2. The virtual grounding method according to claim 1, wherein positive and negative ions are radiated from a positive and negative discharge electrode onto a common induction plate. 3. A virtual ground according to claim 1, wherein a pair of induction plates are connected to the object to be grounded, and the induction plates are separately irradiated with positive ions and negative ions from positive and negative discharge electrodes. Method. 4. The virtual grounding method according to claim 1, 2 or 3, wherein the object to be grounded is a static electricity measuring device. 5. A direct current power source connected to an object to be grounded, a pair of positive and negative discharge electrodes facing the induction plate, a high frequency transformer, and a primary side of the high frequency transformer. A self-excited high-frequency oscillation circuit, a positive-side voltage doubler rectifier circuit that positively rectifies and amplifies the secondary voltage of the high-frequency transformer and applies it to the positive-side discharge electrode, and a negative voltage of the secondary voltage of the high-frequency transformer. A virtual grounding device, comprising: a negative voltage doubler rectifier circuit that amplifies and applies the negative voltage to the negative discharge electrode.