JPH074797Y2 - DC static eliminator - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention uses a low DC voltage as a power source, boosts it to a high positive and negative voltage and applies it to a positive and negative discharge needle to simultaneously generate positive and negative bipolar ions. The present invention relates to a DC static eliminator that removes electric charges from a charged object.

[0002]

2. Description of the Related Art As described in Japanese Patent Publication No. 3-1798, the present applicant has already provided a high-frequency static eliminator using a high-frequency transformer capable of extracting a sufficiently high voltage even if it is small. . This static eliminator is basically a rectifier circuit that rectifies an AC power supply current, and a high-frequency oscillator circuit that is driven by the DC output of the rectifier circuit to self-oscillate.
It is composed of a high-frequency transformer that boosts the high-frequency output, and a discharge unit (static eliminator) to which a positive or negative high-frequency output on the secondary side of the high-frequency transformer is applied via a high-voltage cable.

[0003]

DISCLOSURE OF THE INVENTION It is an object of the present invention to further reduce the size of the conventional device and to make it portable as a DC power source drive type, and to make positive and negative ions equal. The purpose of this is to enable efficient removal of charges from both positive and negative charges due to ion polarity balance, and to extend the ion reach distance despite its small size.

[0004]

A DC static eliminator according to the present invention comprises a pair of positive and negative discharge needles arranged apart from each other, a high frequency transformer, and a direct current connected to a primary side of the high frequency transformer. Between the oscillation circuit that self-oscillates by the power supply, the positive side voltage doubler rectifier circuit connected between the secondary side of the high frequency transformer and the positive side discharge needle, and the secondary side of the high frequency transformer and the negative side discharge needle. And a negative side voltage doubler rectifier circuit connected to. The positive side voltage doubler rectifier circuit is configured by connecting a diode and a capacitor in series in n stages in order to positively rectify and amplify the secondary side AC voltage of the high frequency transformer in n steps. The secondary side AC voltage of the high frequency transformer is configured by connecting m stages of diodes and capacitors in series so as to negatively rectify and amplify the secondary side AC voltage into m stages smaller than n.

[0005]

When a DC voltage is applied to the high frequency oscillating circuit from the DC power supply, the high frequency oscillating circuit self-excites and oscillates to obtain an AC voltage on the secondary side of the high frequency transformer. This AC voltage is
It is rectified and amplified by the positive voltage doubler rectifier circuit and the negative voltage doubler rectifier circuit respectively, and amplified, and the positive DC high voltage is applied to the positive discharge needle and the negative DC high voltage is applied to the negative discharge needle. It

The number of ions generated by ionization tends to be slightly larger in negative ions than in positive ions, but the number of amplification stages of the positive voltage doubler rectifier circuit is larger than that of the negative voltage multiplier rectifier circuit. Therefore, the DC voltage applied to the plus / minus discharge needle is higher on the plus side, and it is possible to generate positive ions and negative ions equally.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a perspective view of this DC static eliminator seen from the front, and FIG. 3 is a perspective view seen from the rear. This DC static eliminator has a single structure in which the electric circuit as shown in FIG. 1 is built in as shown in FIG. 4 in a case 1 that can be held by one hand, and can be carried and operated with one hand. The stand 2 attached to the outside of the case 1 can be installed and used at an appropriate place.

The case 1 is an upper and lower cover 1 made of synthetic resin.
The stand 2 is configured by combining a and 1b, and supports the case 1 so that the inclination of the case 1 can be adjusted, and is detachable from the stand 2. A lamp hole 3 is provided at the center of the front surface of the case 1, circular discharge ports 4 are provided on both the left and right sides thereof so as to be separated left and right, and an external DC power supply connection port 5 is provided at the center of the rear surface.

The electric circuit shown in FIG. 1 is mounted on the circuit board 6 in the lower cover 1b as shown in FIG. 4, and is added to the horizontally long electrode board 7 installed on the front side of the circuit board 6.
Negative-polarity discharge needle 9 is planted, and further lower cover 1b
A power jack 10a is installed at a position facing the external DC power supply connection port 5 in the inside, and a battery 11 serving as a DC power source is detachably accommodated in the lower cover 1b, and these are entirely covered with the upper cover 1a. . A metal electrode clamp 12 is embedded in the electrode substrate 7 for each of plus and minus. Then, each discharge needle 9 is press-fitted at its base end into the electrode clamp 12 so as to be easily cleaned and exchanged, and is removably sandwiched between the clamps, protruding from the front surface of the electrode substrate 7 and each discharge end having a discharge end. It faces the center of mouth 4.

This DC static eliminator includes an AC / DC adapter (not shown) that converts an AC voltage of 100 V into a DC voltage.
Is separately prepared, and DC power can be supplied from the outside by inserting the plug 10b into the power jack 10a through the external DC power connection port 5. At this time, the battery on / off switch 1
0c is turned off and the power supply from the battery 11 is cut off.

In FIG. 1, the DC voltage from the battery 11 or the AC / DC adapter is applied to the high frequency oscillation circuit 16 via the power switch 13, the variable resistor 14 and the fuse 15. The high frequency oscillation circuit 16 is a high frequency transformer 17
When the starting transistor 18 is turned on by the application of a DC voltage, it is oscillated at high frequency by self-excited oscillation. When this oscillates, an AC high voltage is obtained on the secondary side of the high frequency transformer 17, and the light emitting diode 19 which is an operation display lamp is turned on. The light emitting diode 19 is exposed to the lamp hole 3, and it can be seen from the outside that the light emitting diode 19 is in operation by its lighting.

A positive side voltage doubler rectifier circuit 20 and a negative side voltage doubler rectifier circuit 21 are connected in parallel to the secondary side output terminal of the high frequency transformer 17. The structure and principle of a voltage doubler rectifier circuit is known, and by connecting a diode and a capacitor so as to be stacked in series, 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. -It is also called the Walton circuit.

The positive-side voltage doubler rectifier circuit 20 is constructed by connecting a diode D and a capacitor C in series in n stages (5 stages in the figure) so as to positively rectify and amplify the secondary voltage of the high frequency transformer 17 in n stages. In addition, the minus-side voltage doubler rectifier circuit 21 connects the diode D and the capacitor C in series in m stages (4 stages in the figure) in order to negatively rectify and amplify the secondary voltage of the high frequency transformer 17 in m stages smaller than n. Is configured.

Since the output terminal of the positive side voltage doubler rectifier circuit 20 is resistively coupled to the positive side discharge needle 9, it is connected to the positive side electrode clamp 12 via a resistor 22 and the output of the negative side voltage doubler rectifier circuit 21. Since the end is resistance-coupled to the negative side discharge needle 9, it is also connected to the negative side electrode clamp 12 via the resistor 22.

In the configuration as described above, the power switch 1
When 3 is turned on to oscillate the high-frequency oscillation circuit 16, the light-emitting diode 19 lights up, and an AC voltage is generated on the secondary side of the high-frequency transformer 17, and the AC voltage becomes five stages in the plus-side voltage doubler rectifier circuit 20. It is rectified and amplified, and in the negative voltage doubler rectifier circuit 21, it is rectified and amplified in four stages. Therefore, the voltage applied to the positive side discharge needle 9 is higher than the voltage applied to the negative side discharge needle 9. For example, the positive side is 5.6 to 5.9 KV and the negative side is 4.7 to 5.0 KV.

When both discharge needles 4 are directed toward the charged object, positive ions are discharged from the positive side discharge port 4 and negative ions are discharged from the negative side discharge port 4 separately as shown in FIG. Since the ions of (1) are pushed forward by the Coulomb repulsive force, the static elimination region where the ions of both polarities join can be formed in a wide range to a long distance. In this case, since the voltage applied to the positive side discharge needle 9 is slightly higher than the voltage applied to the negative side discharge needle 9, positive ions and negative ions are generated equally. Therefore, since the ionic polarity is balanced, the charged material is not charged in the opposite direction, and efficient charge removal can be performed regardless of the charging polarity or the potential. Since positive ions and negative ions are generated separately from distant places, they are not neutralized at the same time as they are generated, and the ion generation efficiency is good, so ozone is also less generated.

Since a resistor 22 is connected between the output terminals of the positive and negative voltage doubler rectifier circuits 20 and 21 and the positive and negative discharge needles 9, the voltage doubler rectifier circuits 20 and 21 are connected. The current due to the accumulated charge of the capacitor C does not flow into the discharge needle 9 at once. That is,
Since the current can be limited by the resistor 22, there is no electric shock and it is safe.

[0018]

According to the present invention, the following effects can be obtained.
The AC voltage on the secondary side of the high frequency transformer is rectified and amplified by the voltage doubler rectifier circuit consisting of a diode and a capacitor and applied to the plus and minus discharge needles, so even if a small high frequency transformer with a small transformation capacity is used. A sufficiently high voltage can be applied to the discharge needle, and the size can be further reduced as compared with the conventional one.

Since the number of amplification stages of the voltage doubler rectifier circuit on the plus side is made larger than that on the minus side so that the DC voltage applied to the discharge needle on the plus side becomes higher than that on the plus side, Negative ions can be generated equivalently. Therefore, since the charged material is not reversely charged and the ionic polarity is balanced, efficient charge removal can be performed regardless of the polarity or potential of the charged material.

Since the positive and negative polarities of the discharge needles are arranged apart from each other to generate positive ions and negative ions separately from separate locations, it is likely that bipolar ions will be neutralized at the same time as they are generated. In addition to high ion generation efficiency, the voltage applied to the discharge needle can be lowered, so that less ozone is generated.

According to the second aspect, it can be conveniently used as a portable static eliminator which is operated by a built-in battery.

According to the third aspect, since the discharge needle is detachably clamped in the electrode clamp, the discharge needle can be easily cleaned and replaced.

According to the present invention, the current due to the accumulated charge of the capacitor of the voltage doubler rectifier circuit can be resistance-limited, so that there is no electric shock and it is safe.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a DC static eliminator according to the present invention.

FIG. 2 is a perspective view of the DC static eliminator seen from the front.

FIG. 3 is a perspective view of the same seen from the rear.

FIG. 4 is a plan view of the inside of the case with the upper cover removed.

FIG. 5 is a generation distribution diagram of bipolar ions.

[Explanation of symbols]

 1 Case 4 Discharge Port 9 Discharge Needle 11 Battery 12 Electrode Clamp 16 High Frequency Oscillation Circuit 17 High Frequency Transformer 20 Positive Side Double Voltage Rectifier Circuit 21 Negative Side Double Voltage Rectifier Circuit 22 Resistance

Claims (4)

[Scope of utility model registration request] 1. A pair of positive and negative discharge needles arranged apart from each other, a high frequency transformer, and a high frequency oscillating circuit which is connected to the primary side of the high frequency transformer and oscillates self-excited by a DC power source. Positive side voltage doubler rectifier circuit connected between the secondary side of the high frequency transformer and the positive side discharge needle, and negative side voltage doubler rectifier circuit connected between the secondary side of the high frequency transformer and the negative side discharge needle With and
The positive side voltage doubler rectifier circuit is configured by connecting a diode and a capacitor in series in n stages to positively rectify and amplify the secondary side AC voltage of the high frequency transformer in n steps. A DC static eliminator comprising a diode and a capacitor connected in series in m stages to negatively rectify and amplify the secondary side AC voltage of the high frequency transformer in m stages smaller than n. 2. The battery, which is the DC power supply, is built in one portable case together with the oscillation circuit, high frequency transformer, plus side and minus side voltage doubler rectifier circuit, plus side and minus side discharge needle, and the case is provided. 2. The DC static eliminator according to claim 1, wherein the positive and negative side discharge needles are provided with discharge ports facing each other. 3. The positive side and negative side discharge needles are detachably sandwiched between positive side and negative side electrode clamps respectively connected to output terminals of the positive side and negative side voltage doubler rectifier circuits. The DC static eliminator according to claim 2. 4. The positive-side and negative-side discharge needles are connected to the output terminals of the positive-side and negative-side voltage doubler rectifier circuits via resistors, respectively.
Alternatively, the DC static eliminator according to item 2.