WO2008065981A1

WO2008065981A1 - Static elimination apparatus

Info

Publication number: WO2008065981A1
Application number: PCT/JP2007/072727
Authority: WO
Inventors: Yasunori Terasaki; Fumitaka Irie
Original assignee: Hugle Electronics Inc.
Priority date: 2006-11-29
Filing date: 2007-11-26
Publication date: 2008-06-05
Also published as: CN101361407B; KR101340392B1; KR20090106980A; CN101361407A; JP4111348B2; TW200836593A; TWI369925B; JP2008135329A

Abstract

[PROBLEMS TO BE SOLVED] A static elimination apparatus is provided for making it possible to properly control an ion balance by a simply configured control circuit. [MEANS FOR SOLVING THE PROBLEMS] A static elimination apparatus is provided with a positive side high voltage generating circuit (50P) that generates a positive polarity high voltage pulse, a negative side high voltage generating circuit (50N) that generates a negative polarity direct current bias voltage, a discharging stylus (9) to which an alternative voltage pulse obtained by overlapping the high voltage pulse with the direct current bias voltage is applied through a resistor (8) to generate plus and minus ions, a discharge current detecting resistor (11) that detects a discharge current flowing from the discharging stylus (9) to an opposite electrode (10), an ion current detecting resistor (12) that detects an ion current flowing from the discharging stylus (9) to each high voltage generating circuit (50P, 50N) through the ground point, connecting points (13, 14) and a control circuit (2) that adjusts a magnitude of the direct current bias voltage in accordance with a resultant signal of current detected values by each detecting resistor (11, 12) and resistors (13, 14) so as to control a balance of the pulse and minus ions generated from the discharging stylus (9).

Description

Specification

Static eliminator

Technical field

TECHNICAL FIELD [0001] The present invention relates to a static eliminator that applies an AC voltage pulse (positive and negative high voltage pulse) to a discharge needle to generate positive and negative ions, and discharges an object to be discharged with these positive and negative ions.

Background art

Conventionally, as this type of static eliminator, for example, those described in Patent Document 1 and Patent Document 2 are known.

FIG. 4 is a circuit diagram showing the prior art described in Patent Document 1. In FIG. In FIG. 4, 101 is a DC power supply, 102a and 102b are switches, 103 is a control circuit, 104 is a positive high voltage generation circuit, 105 is a negative high voltage generation circuit, 104a and 105a are transformers, and 104b and 105b are doubles The voltage rectifier circuit, 106 is a discharge needle, 107a and 107b are resistors, and 108 is a stray capacitance.

[0003] Next, the operation of this prior art will be outlined.

When the control circuit 103 alternately turns on the positive switch 102a and the negative switch 102b (the other switch is off), the positive high voltage panel output from the positive high voltage generation circuit 104 and the negative high switch The negative high voltage node output from the voltage generation circuit 105 is alternately applied to the discharge needle 106. As a result, positive and negative ions are alternately generated around the discharge needle 106, so that positive and negative ions are supplied to the target object by blowing air from the discharge needle 106 side toward the target object (not shown). can do. In addition, if the on / off time of each switch 102a, 102b and its duty ratio are changed, the magnitude and frequency of the positive and negative voltages applied to the discharge needle 106 can be controlled, and thereby the ion balance of positive and negative ions can be controlled. Control is possible.

FIG. 5 is a circuit diagram showing the prior art described in Patent Document 2. In FIG. 5, 201 is a positive high voltage generation circuit, 202 is a negative high voltage generation circuit, 201a and 202a are self-oscillation circuits, 201b and 202bi transformers, 201c and 202ci voltage doubler rectifier circuits, 203a and 203 b is zener diode, 204 is resistance, 205 is discharge needle, 206 is counter electrode (ground probe) Rate), 207 to 209 are resistors, 210 is an ion current detection circuit, 211 is an abnormal discharge current detection circuit, 212 is a CPU, 213 is an indicator LED, 214 is a frame ground, and 215 is a high-voltage side ground.

[0005] Also in this prior art, positive and negative high voltage pulses are applied to the discharge needle 205 from the positive high voltage generation circuit 201 and the negative high voltage generation circuit 202, and positive and negative ions are alternately generated from the discharge needle 205. To do. Then, a change in the current flowing through the resistor 207 is detected by the ion current detection circuit 210 to detect the contamination of the discharge needle 205, and this is displayed by the display LED 213. In addition, the ion balance of the amount of ions generated is detected from the balance between the positive and negative currents flowing through the resistor 207, and the current force flowing through the resistor 208 can detect the ion balance in the vicinity of the object to be discharged. The ion balance can be controlled by controlling the duty ratio of the control signal sent from the CPU 212 to each of the oscillation circuits 201a and 202a according to the result.

The abnormal discharge current detection circuit 211 detects an abnormal discharge between the discharge needle 205 and the ground plate 206 from the current flowing through the resistor 209 and performs an alarm display or the like.

Patent Document 1: JP 2000-58290 (paragraphs [0035] to [0049], FIGS. 1 to 3 etc.) Patent Document 2: JP 2002-216995 (paragraphs [0020] to [0024] ], Fig. 5 etc.) Disclosure of Invention

Problems to be solved by the invention

[0007] In the prior art described in Patent Document 1, in order to optimally control the ion balance, it is necessary to adjust the on / off time of the switches 102a and 102b and the duty ratio thereof by the control circuit 103. There is a problem that the configuration of the system becomes complicated.

In the prior art described in Patent Document 2, the force S and the ion balance that can detect the ion balance of the generated ions near the discharge needle 205 and the positive and negative ions near the object to be discharged are controlled by the resistors 207 and 208. Since this method is basically the same as that of Patent Document 1, the control program by the CPU 212 may be complicated.

Furthermore, in the prior art according to Patent Document 2, it is impossible to detect the ion current flowing from the discharge needle 205 to the secondary side of the transformers 201b and 202b via the high-voltage side ground 215. Therefore, there is a problem that the ion balance cannot be controlled with high accuracy.

Accordingly, an object of the present invention is to provide a static eliminator capable of controlling ion balance appropriately and with high accuracy by a control circuit having a simple configuration.

Means for solving the problem

[0009] In order to solve the above problem, the invention described in claim 1 includes a first high-voltage generation circuit that generates a voltage pulse having one of positive and negative polarities, and a polarity of the voltage pulse. Is a second high voltage generation circuit that generates a DC bias voltage of reverse polarity, and an AC voltage noise obtained by superimposing the DC bias voltage on the voltage noise is applied via a resistor, and A discharge needle for generating positive and negative ions by corona discharge between the discharge needle, a discharge current detection resistor for detecting a discharge current flowing between the discharge needle and the counter electrode, and the discharge needle and the first and second An ion current detection resistor for detecting the ion current flowing through the grounding point with the high voltage generation circuit, and a detection signal by the discharge current detection resistor and the ion current detection resistor are synthesized and synthesized. Depending on the signal A control circuit for controlling the ion balance of positive and negative ions generated from the discharge needles by adjusting the magnitude of y § scan voltage are those having a.

[0010] The invention described in claim 2 is the static eliminator according to claim 1, further comprising means for varying the frequency of the voltage noise output from the first high voltage generation circuit.

[0011] The invention described in claim 3 is the static eliminator described in claim 1 or 2, wherein the voltage noise output from the first high voltage generation circuit is positive, and the second high voltage generation The DC bias voltage output from the circuit is negative.

The invention's effect

[0012] According to the present invention, the positive / negative ion balance can be controlled appropriately and with high accuracy without using a complicated method such as changing the duty ratio of the positive voltage pulse or the negative voltage pulse as in the prior art. Therefore, the circuit configuration can be simplified and the cost can be reduced.

Further, by adjusting the DC bias voltage based on the current detection values of the discharge current detection resistor and the first and second ion current detection resistors, highly accurate ion balance control can be performed.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention. In the figure, 1 is a DC power supply, and its positive electrode is connected to the power supply terminal of the control circuit 2. One end of a discharge current detection resistor 11, an ion current detection resistor 12, and resistors 13, 14 described later is connected to the input terminal 2C of the control circuit 2, and the first output terminal 2A of the control circuit 2 is a switch. 3 is connected to the input side of the positive oscillation circuit 4P, and the second output terminal 2B of the control circuit 2 is connected to the input side of the negative oscillation circuit 4N.

[0014] The primary winding of the transformer 5P is connected to the output side of the positive oscillation circuit 4P, and a voltage doubler rectifier circuit 6P comprising a plurality of capacitors 61, a Zener diode 62 and a diode 63 is connected to the secondary winding. Has been. The voltage doubler rectifier circuit 6P operates to boost and rectify the high-frequency AC voltage generated in the secondary winding of the transformer 5P and output a positive voltage pulse. Here, the transformer 5P and the voltage doubler rectifier circuit 6P are The positive high-voltage generation circuit 50P is configured as the first high-voltage generation circuit.

[0015] Further, a primary winding of a transformer 5N is connected to the output side of the negative oscillation circuit 4N, and a voltage doubler rectifier circuit 6N including a plurality of capacitors 64 and diodes 65 is connected to the secondary winding. Yes. This voltage doubler rectifier circuit 6N operates to boost and rectify the high-frequency AC voltage generated in the secondary winding of the transformer 5N and output a negative DC bias voltage. Here, the transformer 5N and the voltage doubler rectifier circuit 6N constitute a negative high voltage generating circuit 50N as a second high voltage generating circuit.

[0016] The output terminal of the positive side high voltage generation circuit 50P is directly connected to the connection point 15, and the output terminal of the negative side high voltage generation circuit 50N is connected to the connection point 15 via the current blocking resistor 7. It is connected to the. Further, the discharge needle 9 is connected to the connection point 15 via the resistor 8.

[0017] 10 is a counter electrode arranged in the vicinity of the discharge needle 9, and this counter electrode 10 is connected to the input terminal 2C of the control circuit 2 via the discharge current detection resistor 11 and the connection point 16. It is.

Also, one end of the secondary winding of the transformer 5P, 5N is connected to the resistors 13, 14 and the connection, respectively. It is connected to the input terminal 2C of control circuit 2 via point 16. The connection point 16 is grounded (connected to the ground of the static eliminator itself) via the ion current detection resistor 12! /. That is, one end of each of the discharge current detection resistor 11, the ion current detection resistor 12, and the resistors 13 and 14 is connected to the input terminal 2 C of the control circuit 2 by the connection point 16.

FIG. 2 is a circuit diagram showing the configuration of the control unit 20B for generating a signal to be given from the output terminal 2B to the negative oscillation circuit 4N and the connection relationship between the resistors 11 to 14. The control unit 20B constitutes a part of the control circuit 2.

In Fig. 2, one end of each resistor 11 ~; 14 is connected together! /, One end of capacitor 21 is connected to input terminal 2C (connection point 16), and the other end is grounded. Yes. In addition, one end of the capacitor 21 is connected to an inverting input terminal of an operational amplifier 23 as an inverting amplifier via a resistor 22, and a non-inverting input terminal of the operational amplifier 23 is connected to a volume resistor 25. Reference numeral 24 denotes a feedback resistor of the operational amplifier 23.

The output terminal of the operational amplifier 23 is connected as the output terminal 2B of the control circuit 2 to the negative oscillation circuit 4N. It should be noted that in practice, the force S is such that a current amplification circuit or the like is further connected between the output side of the operational amplifier 23 and the output terminal 2 B, and these illustrations are omitted here for convenience.

Next, the operation of this embodiment will be described with reference to FIG.

When the main power is turned on, the switch 3 is turned on, and a control signal is sent from the output terminal 2A of the control circuit 2 to the positive oscillation circuit 4P. As a result, a high-frequency AC voltage is output from the oscillation circuit 4P, and this AC voltage is boosted and rectified by the voltage doubler rectifier circuit 6P in the positive high-voltage generating circuit 50P to be connected to the connection point 15 as a positive voltage noise. Supplied. Fig. 3 (a) shows this positive voltage noise. For example, assume that the magnitude is + P [V] and the duty ratio is 50%.

On the other hand, by the operation of the control unit 20 部 in the control circuit 2, a control signal that is initially set according to the value of the volume resistance 25 is output from the output terminal 2 が, and this control signal is a negative-side signal. Sent to oscillation circuit 4 回路. As a result, a high-frequency AC voltage is output from the oscillation circuit 4Ν, and this AC voltage is increased by the voltage doubler rectifier circuit 6Ν in the negative high-voltage generation circuit 50Ν. The voltage is rectified and supplied to the connection point 15 in FIG. 1 through the resistor 7 as a negative DC bias voltage. Figure 3 (b) shows this DC bias voltage, and its magnitude is -N [V].

For this reason, as shown in FIG. 3 (c), the voltage at the node 15 is changed to the positive voltage pulse in FIG. 3 (a).

The negative DC bias voltage in (b) is superimposed, and the positive amplitude is + P [V] (P = P

2 2 1

-N), and the negative amplitude is AC [N].

Since this AC pulse is applied to the discharge needle 9 via the resistor 8, the air around the discharge needle 9 is ionized by corona discharge generated between the counter electrode 10 and positive and negative ions are generated. By setting the amplitude in Fig. 3 (c) to P = N, the discharge needle 9 is

2

A positive voltage and a negative voltage with the same value and pulse width are applied alternately.

[0023] Here, since the discharge current flowing between the discharge needle 9 and the counter electrode 10 flows through a series circuit of the discharge current detection resistor 11 and the resistors 13, 14, a voltage corresponding to the discharge current detection value is connected. This voltage appears at point 16 and appears at input terminal 2C in Figure 2.

In addition, the ion current that contributes to the charge removal of the object to be discharged due to the positive and negative ions generated from the discharge needle 9 flows between the discharge needle 9 and the secondary winding of the transformer 5P, 5N via the grounding point of the charge removal device. In other words, since it flows through the ion current detection resistor 12 and the resistors 13 and 14, a voltage corresponding to the positive / negative ion current detection value is generated at the connection point 16, and this voltage also appears at the input terminal 2C. become.

As is clear from the above description, the resistors 13 and 14 contribute to both the detection of the discharge current and the detection of the ion current.

[0024] Therefore, the voltage at the input terminal 2C is a signal obtained by synthesizing the detection value of the discharge current flowing between the discharge needle 9 and the counter electrode 10 and the detection value of the ionic current that actually contributes to the charge removal. Thus, the value reflects the balance of the positive and negative ion amounts considering both the discharge current and the ion current.

In the control unit 20B shown in FIG. 2, the polarity of the input / output voltage is inverted by the operation of the operational amplifier 23.For example, if the voltage at the input terminal 2C changes in the positive direction, the voltage at the output terminal 2B changes in the negative direction. . Therefore, if the voltage at the input terminal 2C changes in either positive or negative direction due to the unbalance of positive and negative ions, the voltage at the output terminal 2B cancels the change. Will change direction.

[0025] Specifically, when it is detected that the amount of positive ions is excessive as the voltage at the input terminal 2C, a control signal that increases the DC bias voltage in FIG. 3 (b) in the negative direction from the output terminal 2B. Based on this control signal, a DC bias voltage increased in the negative direction is generated by the oscillation circuit 4N and the negative high voltage generation circuit 50N.

For this reason, since the area of the negative voltage pulse in the AC pulse of FIG. 3 (c) increases, the amount of negative ions increases and control is performed so as to maintain positive and negative ion balance.

[0026] The operation when the amount of negative ions is excessive is the reverse of the above, and a negative DC bias voltage is generated by a control signal that decreases the DC bias voltage (approaches the 0 direction) in Fig. 3 (b). Therefore, the amount of negative ions is reduced, and control is performed so as to maintain positive and negative ion balance.

With the above operation, the amount of positive and negative ions generated from the discharge needle 9 can be balanced.

[0027] Further, by adjusting the value of the volume resistance 25 in the control unit 20B, the initial value of the negative DC bias voltage can be changed, and the optimum DC bias voltage corresponding to the charge polarity of the object to be discharged can be changed. Can be set.

[0028] By controlling the on / off frequency of the switch 3 and the oscillation frequency of the oscillation circuit 4P, the frequency of the positive voltage pulse output from the positive high voltage generation circuit 50P can be changed, and By adjusting the amplitude of the output voltage of the oscillation circuit 4P, the amplitude of the positive voltage noise can be changed to an arbitrary value.

By appropriately adjusting the frequency and amplitude of the positive voltage pulse and the magnitude of the negative DC bias voltage in this way, the ratio of the AC noise frequency and the positive and negative noise area shown in Fig. 3 (c) is changed. It is possible to control when extra positive or negative ions are supplied according to the charge power, the force that can maintain the positive / negative ion balance, and the charge polarity of the object to be removed.

[0029] In the above embodiment, a positive voltage pulse is generated from the positive high voltage generation circuit 50P, and a negative DC bias voltage is generated from the negative high voltage generation circuit 50N to superimpose them. However, by changing the circuit configuration, the positive high voltage generator circuit 50P A bias voltage may be generated to generate a negative voltage node from the negative side high voltage generation circuit 50N, and these may be superimposed and applied to the discharge needle 9.

Brief Description of Drawings

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a connection relationship between a control unit and each resistor in the embodiment.

FIG. 3 is a waveform diagram showing the operation of the embodiment.

FIG. 4 is a circuit configuration diagram of a conventional technique described in Patent Document 1.

FIG. 5 is a circuit configuration diagram of a conventional technique described in Patent Document 2.

Explanation of symbols

[0031] 1: DC power supply

2: Control circuit

2A, 2B: Output terminal

2C: Input terminal

3: switch

4P: Positive oscillation circuit

4N: Negative oscillation circuit

5P, 5N: Transformer

6P, 6N: Voltage doubler rectifier circuit

61, 64: Capacitor

62: Zener diode

63, 65: Diode

7, 8, 12: Resistance

9: Discharge needle

10: Counter electrode

11: Resistance for detecting discharge current

12: Resistance for ion current detection

13, 14: Resistance

15, 16: Connection point B: Control unit

: Capacitor

:resistance

: Operational amplifier

: Feedback resistance

: Volume resistance

P: Positive high voltage generator N: Negative high voltage generator

Claims

The scope of the claims

[1] a first high-voltage generating circuit that generates a voltage noise of one of positive and negative polarities;

A second high voltage generation circuit for generating a DC bias voltage having a polarity opposite to the polarity of the voltage pulse;

An AC voltage pulse obtained by superimposing the DC bias voltage on the voltage node is applied via a resistor, and a discharge needle that generates positive and negative ions by corona discharge between the counter electrode, the discharge needle, and the discharge needle A discharge current detection resistor for detecting the discharge current flowing between the counter electrode and

An ion current detection resistor for detecting an ion current flowing through a ground point between the discharge needle and the first and second high voltage generation circuits;

The detection signal by the discharge current detection resistor and the ion current detection resistor is synthesized, and the magnitude of the DC bias voltage is adjusted according to the synthesized signal to control the ion balance of the positive and negative ions generated by the discharge needle force. A control circuit to

A static eliminator characterized by comprising:

[2] In the static eliminator according to claim 1,

A static eliminator comprising means for varying the frequency of a voltage pulse output from the first high voltage generation circuit.

[3] In the static eliminator according to claim 1 or 2,

A static eliminator characterized in that the voltage noise output from the first high voltage generation circuit is positive and the DC bias voltage output from the second high voltage generation circuit is negative.