JP3037548U - Static eliminator grounding device - Google Patents

Abstract

(57) [Problem] To ground a static eliminator, a pseudo-grounding state similar to grounding can be obtained without using a ground wire, and the state can be constantly maintained. SOLUTION: A commercial AC power supply is stepped down by a step-down transformer 15 and rectified by a rectifier circuit 16, and a high-frequency oscillation circuit 5 is oscillated by the DC voltage to be boosted to a high voltage by a high-frequency step-up transformer 6, and this is discharged to a discharge electrode 11. In a static eliminator capable of generating positive and negative ions by applying the voltage to 12, one polarity of the primary side and the secondary side of the high-frequency step-up transformer 6 is connected to form a common potential reference line 13. ,
By connecting the potential reference line 13 to the primary side of the step-down transformer 15 via the high voltage 17, the commercial AC power source is used for grounding.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is a static eliminator that generates positive and / or negative ions from a discharge electrode to eliminate static electricity from a charged object (including gas). In order to improve safety and static elimination performance, the static eliminator is grounded. Related to the grounding device.

[0002]

[Prior art]

 Conventionally, in the static eliminator disclosed in, for example, Japanese Utility Model Publication No. 7-4977, it is dangerous when the potential from the charged object to be neutralized is induced on the static eliminator side, and the discharge electrode is Since the applied voltage also becomes unstable due to the dielectric potential, a dedicated grounding terminal for grounding was provided separately, and a grounding wire was connected to this grounding terminal for grounding.

[0003]

[Problems to be solved by the device]

 However, electric shock accidents sometimes occurred due to disconnection of the ground wire and poor contact. In addition, depending on the place of use, there are also problems in work, such as having to run the ground wire for a long time and the difficulty of installing the ground wire due to obstacles.

Further, in the static eliminator described in the above publication, a high frequency oscillating circuit is oscillated by a DC voltage, a high voltage is boosted to a high voltage by a high frequency boosting transformer, and this is applied to a discharge electrode. If you want to use the AC / DC adapter that is ready-made to obtain the DC voltage for, the step-down transformer in the AC / DC adapter is not designed to be used under high voltage conditions. Otherwise, the high voltage induced in the static eliminator reaches the AC / DC adapter, and there is a risk that the internal step-down transformer will be destroyed.

It is an object of the present invention to ground a static eliminator, and even if it does not use a ground wire, it can be in the same pseudo-grounded state as when it is grounded, and that state can be maintained at all times. To provide a grounding device.

[0006]

[Means for Solving the Problems]

 The present invention is a static eliminator that uses a commercial AC power source as a power source to boost a high voltage with a high-frequency boosting transformer, and applies this to the discharge electrode by connecting the primary and secondary polarities of the boosting transformer. By forming a common potential reference line and connecting this potential reference line to a commercial AC power supply via a high resistance, the grounding is performed using the commercial AC power supply.

Further, the commercial AC power source is stepped down by a step-down transformer and rectified by a rectifier circuit, the high-frequency oscillator circuit is oscillated by the direct-current voltage, the high-frequency step-up transformer is stepped up to a high voltage, and this is applied to a discharge electrode. In the case of a static eliminator capable of generating positive and negative ions, a common potential reference line is formed by connecting the polarities of the primary side and the secondary side of the high-frequency booster transformer to form a common potential reference line. Is connected to the primary side of the step-down transformer via a high resistance.

When an AC / DC adapter is used as a step-down transformer and a rectifier circuit, a potential reference line is connected to the primary side of the step-down transformer via a high resistance to prevent a failure from a commercial AC power source. The high resistance is housed in the case of the AC / DC adapter together with the step-down transformer and the rectifier circuit.

[0009]

[Embodiment of the invention]

 Next, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in the circuit configuration of FIG. 1, the static eliminator 1 is connected via an AC / DC adapter 2 to a commercial AC power supply of, for example, 100V, and the AC voltage of the AC / DC adapter 2 is, for example, 12V. The DC voltage is stepped down and rectified to be the power source of the static eliminator 1.

The static eliminator 1 includes a capacitor 4 for voltage stabilization, a high frequency oscillation circuit 5, a high frequency boosting transformer 6, a plus side voltage doubling voltage rectifier circuit 7 and a minus side voltage doubling voltage rectifier circuit 8, and a plus voltage -It is composed of negative needle-shaped discharge electrodes 11 and 12.

The high frequency oscillation circuit 5 includes a starting transistor 10, a resistor R1, a capacitor C1 and the like, and is connected to the primary side of the high frequency boosting transformer 6. When the power switch 9 is turned on, a DC voltage is applied to the high-frequency oscillator circuit 5 to turn on the startup transistor 10, the high-frequency oscillator circuit 5 oscillates at high frequency by self-excited oscillation, and the secondary side of the high-frequency step-up transformer 6 is turned on. High AC voltage can be obtained.

On the secondary side of the high-frequency booster transformer 6, a positive side voltage doubler rectifier circuit 7 and a negative side voltage doubler rectifier circuit 8 are connected in parallel. These voltage doubler rectifier circuits 7 and 8 are connected in series so as to stack a diode D and a capacitor C, respectively, so that a high voltage DC voltage that is a multiple of the secondary voltage of the transformer can be obtained by the number of stacked stages. To be. In order to make the plus and minus static elimination conditions the same, the number of amplification stages of the plus side voltage doubler rectifier circuit 7 is larger than that of the minus side voltage doubler rectifier circuit 8. In the example shown in the figure, the plus-side voltage doubler rectifier circuit 7 has five stages, and the minus-side voltage doubler rectifier circuit 8 has four stages. The output terminals of these positive and negative voltage doubler rectifier circuits 7 and 8 are resistively coupled to the positive and negative discharge electrodes 11 and 12, respectively, so that the positive and negative discharge electrodes 11 and 12 are separately connected via the resistor R2. It is connected.

Further, the negative side tap 6a on the primary side of the high-frequency boosting transformer 6 and the negative side tap 6b on the secondary side are connected to form a common potential reference line 13 on the primary side and the secondary side. The potential reference line 13 serves as a reference for a potential common to the primary side circuit and the secondary side circuit for the high-frequency step-up transformer 6, and the potential reference line 13 is used inside the circuit of the static eliminator 1. The polarity and magnitude of the potential are determined as a reference.

The AC / DC adapter 2 lowers the commercial AC voltage applied via the fuse 14 with a step-down transformer 15 and rectifies it with a rectifier circuit 16 composed of a diode and a capacitor to obtain a DC voltage of, for example, 12V. . In the AC / DC adapter 2, the potential reference line 13 on the static eliminator 1 side is connected to one input end on the primary side of the step-down transformer 15 via a high resistance (for example, 4.7 MΩ) 17, and also the step-down transformer. The middle tap on the secondary side of 15 is similarly connected via this high resistance 15.

FIG. 2 shows a specific example of the structure of the AC / DC adapter 2. The AC / DC adapter 2 has a fuse 14, a step-down transformer 15, a rectifier circuit 16 and a high resistance 17 housed in an insulating case 18, a plug 19 is provided on the outer surface of the insulating case 18, and an output cord is output from the insulating case 18. 20 is pulled out and is connected to the static eliminator 1 by this output cord 20.

Next, the operation will be described with reference to FIG. When the discharge electrodes 11 and 12 are directed to a charged object to eliminate static electricity, the potential of the charged object (not shown) is induced to the input terminal 21 common to the plus and minus voltage doubler rectifier circuits 7 and 8. Further, this potential is also induced to the primary side thereof via the high frequency boosting transformer 6. This induced potential depends on the level of the charged potential of the charged object, so it is dangerous to have a high potential. Further, the high-frequency step-up transformer 6 is manufactured to have a specification with sufficient withstand voltage, but the AC / DC adapter 2 is a ready-made one and does not take into consideration the withstand voltage of the step-down transformer 15 against a high potential. Therefore, the step-down transformer 15 is destroyed due to the induced potential from the charged material. Furthermore, when the potential from the charged material is induced at the input end 21, the applied voltage to the discharge electrodes 11 and 12 changes by that amount, and the charge removal performance also deteriorates.

In order to avoid such a situation, in the conventional static eliminator, the grounding terminal is separately provided as described above, and the user is obliged to use it by grounding it with the grounding wire. There was a problem.

According to the present invention, the same effect as grounding can be obtained without grounding with a ground wire. That is, since the potential reference line 13 common to the primary side and the secondary side of the high-frequency step-up transformer 6 is connected to the commercial AC power supply via the high resistance 17, the commercial AC power supply should be grounded on the supply side. Therefore, the same result is obtained when the potential reference line 13 is grounded. Further, since the potential reference line 13 and the commercial AC power supply are connected by the high resistance 17, it is possible to limit the current from the commercial AC power supply, so that it is safe and the step-down transformer 15 and the high frequency oscillation are provided. The circuit 5 can be protected. It has been confirmed by experiments that even if the potential reference line 13 and the commercial AC power source are connected with a high resistance 17, the static elimination performance of the static eliminator 1 is not affected.

[0020]

[Effect of the invention]

 As described above, according to the present invention, since the potential reference line common to the primary side and the secondary side of the step-up transformer of the static eliminator is artificially grounded by using the commercial AC power source, Even if a separate grounding terminal is not provided and grounding is performed with the grounding wire, the same effect as grounding can always be obtained, so the safety and static elimination performance of the static eliminator can be improved more economically and simply than before. Further, it is possible to avoid a failure from the commercial AC power supply and protect the step-down transformer when the AC / DC adapter is used.

By storing the high resistance in the case of the AC / DC adapter together with the step-down transformer and the rectifier circuit, it is only necessary to connect the AC / DC adapter and the static eliminator with a cord or the like. Can be grounded.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of a circuit configuration showing an example of a grounding device according to the present invention together with a static eliminator.

FIG. 2 is a sectional view showing a specific example of the structure of the AC / DC adapter.

[Explanation of symbols]

 1 Static eliminator 2 AC / DC adapter 5 High frequency oscillation circuit 6 High frequency step-up transformer 7 Positive side voltage doubler rectifier circuit 8 Negative side voltage doubler rectifier circuit 11 Positive side discharge electrode 12 Negative side discharge electrode 13 Potential reference line 15 Step-down transformer 16 Rectifier circuit 17 High resistance 18 cases

Claims (4)

[Utility model registration claims] 1. A static eliminator for boosting a high voltage to a discharge electrode using a commercial AC power source as a power source, and applying this to a discharge electrode by connecting one polarity of the primary side and the secondary side of the boosting transformer. A grounding device for a static eliminator characterized in that a common potential reference line is formed and the potential reference line is connected to a commercial AC power source through a high resistance. 2. A commercial AC power supply is stepped down by a step-down transformer and rectified by a rectifier circuit, a high-frequency oscillator circuit is oscillated by the direct-current voltage, a high-voltage step-up transformer is used to raise the voltage to a high voltage, and this is applied to a discharge electrode. In a static eliminator capable of generating positive and negative ions, a common potential reference line is formed by connecting one polarity of the primary side and the secondary side of the high-frequency boosting transformer to form a common potential reference line. A grounding device for a static eliminator, which is connected to the primary side of the step-down transformer via a resistor. 3. A step-down transformer and an AC / D as a rectifier circuit.
3. The grounding device for the static eliminator according to claim 2, wherein a C adapter is used, and a potential reference line is connected to the primary side of the step-down transformer via a high resistance. 4. The grounding device for the static eliminator according to claim 3, wherein the high resistance is housed in a case of an AC / DC adapter together with a step-down transformer and a rectifying circuit.