CN101268722A

CN101268722A - Static eliminator

Info

Publication number: CN101268722A
Application number: CNA2006800348225A
Authority: CN
Inventors: 中川彻; 沼口敏一
Original assignee: 3M Innovative Properties Co
Current assignee: 3M Innovative Properties Co
Priority date: 2005-09-22
Filing date: 2006-09-20
Publication date: 2008-09-17
Also published as: KR20080046668A; JP2007087791A; TW200721621A; WO2007038114A1; EP1935219A1

Abstract

To provide a static eliminator capable of accurately determining the arrival of cleaning time. A high voltage +HV applied to a discharge electrode is resistively divided and supplied to one terminal of a comparator (24), and a reference voltage is supplied to the other terminal of the comparator (24). When the high voltage +HV becomes lower than a predetermined value, the output of the comparator (24) goes to a L level, causing an LED (18) to light to indicate the arrival of the cleaning time.

Description

Xelminator

Technical field

The present invention relates to Xelminator (ion generator), it has the output alarm function and arrives the sparking electrode cleaning time to inform.

Background technology

Xelminator disclosed in this invention (ion generator) be by corona discharge with air ionization, and eliminate static by Ionized air is blowed to charged object, for example, uncensored Japanese patent publication No.2002-75589.

In this class Xelminator, if high voltage source or sparking electrode are contaminated, the corona discharge performance will descend, and static can't fully be eliminated at the appointed time.Herein, the high pressure in the Xelminator is meant greater than 1kV and is up to the voltage of ten and several kV.In general, very difficult proficiency is known owing to the palliating degradation degree that pollutes the corona discharge performance cause, therefore eliminates performance in order to keep required static, adopts traditionally and regularly implements cleaning, and do not consider the degree polluted.

The uncensored Japanese patent publication No.2003-17293 that below quotes discloses a kind of device, this device shows whether arrive cleaning time according to the anion balance controlling value in the Xelminator, and described Xelminator is carried out the ionic equilibrium control of cation and anion.This ionic equilibrium control is to carry out according to skin ampere level (pico-ampere order) weak current of circulation between ground and negative ions current detecting electrode, and described current detecting electrode is placed in the ionized air stream.Therefore, this control is subject to induced noise voltage on the electrode and the The noise in the running environment, and is difficult to determine exactly the degree of decreased performance.

The target of at least one embodiment of the present invention provides the Xelminator that has the warning output function, and this Xelminator can determine whether to arrive cleaning time exactly according to predetermined reference.

Summary of the invention

According at least one embodiment of the present invention, Xelminator is provided, comprising: can generate the high voltage generating circuit of high pressure, described high pressure is applied to sparking electrode; Voltage comparator circuit, the voltage and the reference voltage level that are used for being applied to described sparking electrode compare, and determine the arrival of the cleaning time of described sparking electrode according to described reference voltage level; And the alarm output, when the voltage that is applied to described sparking electrode during less than described reference voltage level, alarm output output alarm.

For example, above-mentioned reference voltage level was determined according to the required static elimination time.

According at least one embodiment of the present invention, notice that the insulation impedance between electrode and the ground can reduce because of pollution, thereby the voltage of guiding discharge electrode reduces, and the voltage of electrode reduces and have certain relation between the static elimination time (reaching the necessary static elimination required time of effect), so lay down a regulation, the arrival that electrode voltage and reference value were compared and exported the alert notification cleaning time; Therefore, the present invention can determine the arrival of cleaning time exactly.

Description of drawings

Fig. 1 is the block diagram that Xelminator structure according to an embodiment of the invention is shown in simplified form.

Fig. 2 is the circuit diagram that an example of voltage comparator 16 physical circuits structure is shown.

Fig. 3 is the circuit diagram that a modification of circuit among Fig. 2 is shown.

Embodiment

According to one embodiment of present invention, Fig. 1 shows the structure of the Xelminator with warning function in simplified form.In Fig. 1, high pressure generator 10 utilizes DC power supply to generate the positive high voltage+HV and the negative high voltage-HV of thousands of volts, and above-mentioned high pressure is offered positive sparking electrode 12 and negative sparking electrode 14 respectively, so that ground is produced corona discharge.Voltage comparator 16 compares voltage and the predetermined reference value that produces respectively between ground and

electrode

12 and 14, and, when absolute value of voltage during, can cause LED 18 to light or buzzer 30 sends sound, with notice arrival cleaning time less than reference value.

Table 1 shows by way of example to obtaining the result of electrode voltage and the measurement that concerns between the static elimination time, the described static elimination time be voltage be+metallic plate of 1000V reduces to voltage+the required time of 100V at 30cm place, distance Xelminator front portion.

Table 1. electrode voltage and the relation between the static elimination time (example)

Electrode voltage [kV]	5	4.6	4.4	4	3.6	3.2
Electrode voltage [kV]	5	4.6	4.4	4	3.6	3.2	Static is eliminated the time [second]	0.1	0.3	0.3	0.5	1.2	29.7

As can be seen from Table 1, if wish that static is eliminated time dimension is held in 0.5 second or shorter time, above-mentioned reference value should be set to 4kV, and should carry out cleaning when alarm is sent.Compare with the scheme of the ionic current of measuring skin ampere level, this electrode voltage can be measured more accurately, because it is not affected by noise, and therefore can determine the arrival of cleaning time more accurately.

Fig. 2 is the chart that an example of voltage comparator 16 physical circuits structure is shown.In Fig. 2, provide

resistor

20 and 22 so that the high pressure of thousands of volts is between the two carried out dividing potential drop, thereby obtained about 1 volt voltage.Be provided for in-phase input end by the voltage that dividing potential drop obtained between

resistor

20 and 22, and the corresponding voltage of above-mentioned reference voltage is provided for the inverting input of above-mentioned operational amplifier 24 as the operational amplifier 24 of comparator.When being lower than reference voltage by the voltage that dividing potential drop obtained between

resistor

20 and 22, the output of operational amplifier 24 becomes low level by high level, thereby causes LED 18 to light.

In the circuit of Fig. 2, have only positive voltage to be calculated, but similar two circuit to that indicated in the drawings can be used, so that give the alarm for each positive electrode and negative electrode.Alternatively, positive and negative alarm output can by " or " together, LED can be lighted according to the gained result then.

Fig. 3 shows a kind of modification of the circuit of Fig. 2.In the example of Fig. 3, by the resistive dividing potential drop, and be used as the reverse input end that reference voltage offers operational amplifier 24 from the constant voltage of constant-current source 26.One end of resitstance voltage divider can be selected by switch, so that the rank of alarm, that is, the static discharge time rank that keep can be selected by this switch.Should be noted that although related to the Xelminator with high voltage direct current generator when describing the foregoing description, the present invention is not limited to these, but also can be applied to having the Xelminator of ac high voltage generator.

Claims

1. Xelminator, it comprises:

Be used to generate the high-pressure generating circuit of high pressure, described high pressure is applied to sparking electrode;

Voltage comparator circuit, the voltage and the reference voltage level that are used for being applied to described sparking electrode compare, and determine the arrival of the cleaning time of described sparking electrode according to described reference voltage level; And

The alarm output, when the voltage that is applied to described sparking electrode during less than described reference voltage level, described alarm output output alarm.

2. Xelminator according to claim 1 is wherein determined described reference voltage level according to the required static elimination time.