JPS6236539B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to provide a static electricity generator in which a plurality of metal plates are insulated from the earth and are crossed approximately at the center.
The idea is to connect a capacitor between the intersection and the ground to change the capacitance between the ground and the ground.

BACKGROUND ART Static electricity generators called vane type and capacitor type are in practical use for testing electrostatic disturbances by discharging electric charge into electronic equipment. The vane method is said to be superior to the capacitor method because it has a three-dimensional circuit and can generate an electromagnetic field in the air similar to the phenomenon of human body discharge.

As shown in FIG. 1, the conventional blade-type static electricity generator has a plurality of blades 1 that intersect at approximately the center of a metal plate, which are perpendicular to and insulated from the earth 5, and are connected to a high-voltage power source 3. It is connected to the blade 1 through a charging resistor 2 to provide a charge. Also, one of the blades 1 of this static electricity generator is connected to an electronic device via a switch 4, and by closing the switch, the electric charge charged in the static electricity generator is released to the electronic device.
Test electronic equipment for electrostatic disturbances. However, since the blades 1 of the blade-type electrostatic generator are arranged perpendicularly to the ground 5, the capacitance cannot be increased, and high voltage must be applied to the blades 1 to provide a large amount of charge. However, applying high voltage has the disadvantage that it is dangerous. On the other hand, the capacitor method can easily obtain a large capacitance, but the charge discharge loss is large, the charge does not flow easily, and it is necessary to apply a higher voltage to increase the amount of charge than the vane method.

Further, the discharge current i that flows when discharging the electric charge charged from the static electricity generator to the electronic device is expressed by the following equation.

In this equation, k={4/LC-(r/L) ² } ^1/2 E: Capacitance voltage L: Stray inductance r: Loss resistance C: Capacitance t: Time.

According to this equation, if the applied voltage is the same, the smaller the loss r is when the capacitance is constant, and the larger the capacitance is, the more the discharge current i can flow.

The present invention relates to a capacitance generator in which a capacitor is inserted between the intersection of the vanes and the ground in order to eliminate the disadvantage of not being able to increase the capacitance in the conventional vane system and to allow a large discharge current to flow. be.

As shown in the embodiment of FIG. 2, the electrostatic generator of the present invention has a capacitor 6 inserted between the intersection 7 of the blades 1 of the metal plate and the ground 5, and a charging resistor 2 connected to the power source 3.
A charge is applied through the switch 4, and a discharge current is caused to flow through the electronic device through the switch 4. Here, capacitor 6
If the insertion point of is shifted to one side of the blade 1, the added capacitance 6 and a part of the capacitance created by the added blade 1 are equivalently connected in series, and the capacitance appears to decrease. do. However, when added at an intersection, it can be considered that the capacity is added in parallel without substantially affecting the capacity produced by the blades 1. Therefore, by inserting a capacitor at the intersection where all the metal plates that make up the blade 1 come into contact, the effect of increasing the capacitance appears, and the damping characteristics of the oscillating current do not deteriorate and the current is the same as in the case of the blade method alone. A curve is obtained.

As described above, the present invention has the advantage of increasing the capacity by adding a capacitance to the conventional vane-type electrostatic generator, allowing a large discharge current to flow, and facilitating electrostatic disturbance testing of electronic equipment. be.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional vane type static electricity generator, and FIG. 2 is a circuit diagram of a vane type static electricity generator of the present invention. In the figure, 1: blade, 2: charging resistor, 3: power supply, 4: switch, 5: earth, 6: capacitor,
7: It is an intersection.

Claims (1)

[Claims] 1. A static electricity generator in which a plurality of metal plates insulated from the earth intersect at approximately the center, and a capacitor is inserted between the intersection and the earth.