JPH09274946A - Ground circuit and anion generator using the circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discharge an electric charge from an electrified metallic guard or case without any special wiring by using a ground circuit of simple structure. SOLUTION: An alternate current of 100V is applied to a DC high voltage generating circuit incorporated inside a case 13 via a connecting plug 14, thereby generating a high voltage of several thousands volts. The high voltage generating circuit is connected on a minus side to a needle-like minus electrode 12, which is protected from any touch by a guard 11. An AC line is connected to the guard 11 made of metal via two diodes of a diode bridge 15. With this wiring, an electric charge charged in the metallic guard 11 and case 13 flows the AC line, but cannot charge the metallic guard 11 and case 13. In this way, it is possible to easily discharge the electric charge charged in the metallic case without any special wiring by the use of an earth circuit of simple structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground circuit, and more particularly to a ground circuit having a simple structure and requiring no special wiring.

[0002]

2. Description of the Related Art Conventionally, for electrical equipment, a grounding circuit has been attached to a metal case or the like of the electrical equipment for safety and the like. This is done, for example, by connecting the case of the electric device to a ground wire provided outside. In this case, if the ground wire is not provided outside, it is necessary to carry out wiring work for the ground wire and provide the ground wire. In the case of indoor wiring in Japan, the grounding wire is not normally wired, so if the grounding is necessary for the safety of electrical equipment, special wiring work must be done.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a grounding circuit capable of grounding a metal case of an electric device or the like without grounding special wiring. .

[0004]

In order to achieve the above object, the grounding circuit of the present invention connects two AC lines via two diodes between the metal case and the AC line. There is.

With this structure, since the AC line is grounded, it is not necessary to make a special wiring for grounding.

Further, the earth circuit is used as the earth of the metal guard of the negative ion generator. By using the ground circuit in this way, the positive charge charged on the metal guard can be released with a simple configuration, and a safe negative ion generator can be configured.

[0007]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a circuit diagram of an earth circuit which is an example of an embodiment to which the present invention is applied.

In FIG. 1, the metal case 1 is in an environment where electric charges are easily accumulated. In this case, the metal case and the AC line side (outlet connection) are connected via the two diodes of the diode bridge 2. The charge accumulated in the metal case 1 is AC through the two diodes.
Flowing to the line. Thus, in the present embodiment,
The AC line can be used as a ground to release charges.

Since the AC line side is insulated by the two diodes, there is no influence of the voltage on the AC line side.

A case where the earth circuit shown in FIG. 1 is applied to a negative ion generator will be described. This is shown in FIG. In FIG. 2, 12 is a needle-shaped negative electrode, 11 is a guard covering the negative electrode,
Reference numeral 13 is a case, and 14 is a connection plug. The guard 11 and the case 13 are made of metal.

With the configuration shown in FIG. 1, the DC high-voltage generating circuit built in the case 13 generates a high voltage of several thousand volts from the AC 100 volts applied from the connection plug. The negative side of the generated high voltage of direct current is connected to the needle-shaped negative electrode. And, the positive electrode is not provided explicitly. The needle-shaped negative electrode is protected by the guard 11 from being touched by a hand or the like.

Now, the guard formed of this metal is connected to the AC line through the two diodes of the diode bridge 15 as shown in FIG. By wiring in this way, the metal guard 11
And the electric charge charged in the case 13 flows into the AC line, and the metal guard 11 and the case 13 are not charged.

As described above, by using the earth circuit of the present invention, the electric charge charged in the metal case can be easily discharged.

A large number of negative ions can be generated with a simple and small shape. Further, since the positive electrode is not explicitly provided, the generated negative ions do not disappear at the nearby positive electrode, and the generated negative ions can be effectively used.

Further, the shape of the electrode is not limited to the needle shape,
Other shapes may be used.

In the above description, the grounding circuit has been explained especially with the negative ion generating device, but this grounding circuit is particularly effective for releasing the electric charge, and is not limited to the case of the negative ion generating device or other electric equipment, and for example, It is also effective as a ground circuit for things that are easily charged, such as doors and knobs.

[0018]

As described above, the ground can be formed with a simple structure, and it is not necessary to provide special wiring.

Further, when it is used as a guard case of a negative ion generator, charges can be released, so that a safe negative ion generator can be constructed.

[Brief description of drawings]

FIG. 1 is a wiring diagram of a ground circuit of the present invention.

FIG. 2 is a configuration diagram when the present invention is applied to a negative ion generator.

[Explanation of symbols]

 1 Metal Case 2 Diode Bridge 11 Guard 12 Negative Electrode 13 Case 14 Plug

Claims (4)

[Claims] 1. A grounding circuit connected between a metal case and an AC line, and two AC lines via two diodes. 2. A negative ion generator, wherein the ground circuit of claim 1 is used as a ground for a metal guard of a negative ion generator. 3. The negative ion generator according to claim 1, wherein an electrode is provided only on the negative side and no electrode is explicitly provided on the positive side at the output terminal of the high voltage generating circuit. 4. The negative ion generator according to claim 1, wherein the negative electrode has a needle shape.