KR20140087514A - Micro Pulse System and method for controlling the same - Google Patents

Micro Pulse System and method for controlling the same Download PDF

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Publication number
KR20140087514A
KR20140087514A KR1020120157893A KR20120157893A KR20140087514A KR 20140087514 A KR20140087514 A KR 20140087514A KR 1020120157893 A KR1020120157893 A KR 1020120157893A KR 20120157893 A KR20120157893 A KR 20120157893A KR 20140087514 A KR20140087514 A KR 20140087514A
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KR
South Korea
Prior art keywords
voltage
pulse
power supply
capacitor
reactor
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KR1020120157893A
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Korean (ko)
Inventor
한병욱
황광호
김효언
김해중
Original Assignee
주식회사 포스코아이씨티
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Priority to KR1020120157893A priority Critical patent/KR20140087514A/en
Publication of KR20140087514A publication Critical patent/KR20140087514A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
    • H03K3/537—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a spark gap

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electrostatic Separation (AREA)

Abstract

A micropulse apparatus according to the present invention includes a first DC power supply unit, a pulse voltage generator for generating a pulse voltage by using a voltage supplied from the first DC power supply unit, A DC voltage generating unit including a second DC power supply unit and generating a DC voltage using a voltage supplied from the second DC power supply unit; And a dust collecting unit connected to the pulse voltage generating unit and the DC voltage generating unit to remove dust using the pulse voltage including the DC voltage and the modulatable frequency, wherein the pulse voltage generating unit generates the pulse voltage And a transforming unit formed between the dust collecting unit and for boosting the pulse voltage output from the pulse circuit unit at a predetermined ratio,
According to the present invention, there is an effect of reducing the power conversion loss and increasing the energy efficiency of the output voltage.

Description

TECHNICAL FIELD [0001] The present invention relates to a micro-pulse device and a control method thereof,

The present invention relates to a micro-pulse device and a control method thereof.

The micro-pulse device is a device for generating a pulse having a short width in the unit of μs and can be utilized as a micro-pulse system (MPS) for electric power collection.

The micropulse apparatus for electric discharge is a pulse voltage (VPS) having a short width (for example, 90 to 120 μs) after a DC voltage (VDC) which is an initial voltage is set between a discharge electrode and a dust collecting plate by a negative micro- ) Are superposed and applied to an electric dust collector to remove dust.

The charging method of the micropulse apparatus for electrostatic chuck is for collecting dust by independently controlling two different charges, and gas molecules having a high electronegativity react with electrons to generate negative ions, and the dust is charged by negative ions to move to the dust collecting pole And is collected by the dust collecting plate and then removed by a mechanical exhaust device.

FIG. 1 is a block diagram of a micro-pulse system (MPS) for explaining a conventional micro-pulse power supply method.

As shown in FIG. 1, a conventional micropulse apparatus (MPS) 10 for electric power collection according to the related art includes a three-phase AC power supply unit 20, a first three-phase transforming unit 30, a second three-phase transforming unit 40, A three-phase rectification section 50, a second three-phase rectification section 60, and an electrostatic precipitator 70.

The three-phase AC power supply unit 20 supplies power to the micro-pulse device, and can use a general three-phase commercial power supply.

The first three-phase transformer 30 boosts the three-phase power supplied from the three-phase AC power source 20 and outputs it to the first three-phase rectifier 50. The first three-phase transformer 30 may be formed by various connections such as delta-wire connection.

The second three-phase transformer 40 boosts the three-phase power supplied from the three-phase AC power source 20 and outputs the three-phase power to the second three-phase rectifier 60. The second three-phase transformer 40 may be formed by various connections such as delta-wire connection.

The first three-phase rectifier (50) rectifies the AC voltage input from the first three-phase transformer (30) by using a plurality of diodes and outputs the rectified AC voltage to the electric dust collector (70).

The second three-phase rectifier (60) rectifies the AC voltage input from the second three-phase transformer (40) using a plurality of diodes and outputs the rectified AC voltage to the electric dust collector (70).

The electric dust collector 70 generates a DC voltage from the input of the first three-phase transforming unit 30 and applies it to the discharge electrode and the dust collecting plate, generates a pulse voltage from the input of the second three-phase transforming unit 40, .

The DC voltage and the pulse voltage applied to the discharge electrode and the collecting plate remove the dust according to the micropulse charging method.

However, when a three-phase transformer and a three-phase rectifier are used to generate a DC voltage and a pulse voltage from a three-phase power source according to the related art, the quality of output power such as energy loss and harmonic generation occurs in the course of power conversion, There is a problem that the efficiency is lowered.

Also, if a commercial frequency transformer is used to cool a three-phase transformer, there is a problem that the size and weight of the micropulse device increases because an apparatus for immersing the dielectric oil must be added.

SUMMARY OF THE INVENTION It is a general object of the present invention to provide a micro-pulse device and a control method thereof that efficiently supply power to solve the above-described problems.

According to an aspect of the present invention, there is provided a micro-pulse device including a first DC power supply unit, a pulse voltage generating unit generating a pulse voltage using a voltage supplied from the first DC power supply unit, A DC voltage generating unit including a second DC power supply unit and generating a DC voltage using a voltage supplied from the second DC power supply unit; And a dust collecting unit connected to the pulse voltage generating unit and the DC voltage generating unit to remove dust using the pulse voltage including the DC voltage and the modulatable frequency, wherein the pulse voltage generating unit generates the pulse voltage And a transforming unit formed between the dust collecting unit and boosting the pulse voltage output from the pulse circuit unit at a predetermined ratio.

According to another aspect of the present invention, there is provided a method for controlling a micropulse apparatus, comprising: turning off a switch connected in parallel to a first reactor and a first capacitor so that a voltage supplied from a first DC power supply unit, To charge the first capacitor and turn on the switch to apply a charge voltage of the first capacitor to the first reactor to generate a pulse voltage; Generating a DC voltage higher than the pulse voltage by using a voltage supplied from a second DC power supply; And superimposing the pulse voltage having a positive voltage on the DC voltage having a negative voltage to remove dust.

According to the present invention, there is an effect of reducing the power conversion loss and increasing the energy efficiency of the output voltage.

Further, according to the present invention, there is an effect that the ripple rate of the direct current power source is reduced by using the direct current power source device and the power quality is improved.

Further, according to the present invention, since the circuit configuration is simple, the volume and weight of the micro-pulse device can be reduced, and maintenance is easy.

FIG. 1 is a block diagram of a micro-pulse system (MPS) for explaining a conventional micro-pulse power supply method.
2 is a block diagram showing an embodiment of a micro-pulse device according to the present invention.
3 and 4 are diagrams illustrating a switching operation for generating a pulse voltage of the micro-pulse device according to the present invention.
5 is a diagram showing a DC voltage and a pulse voltage of the micro-pulse device according to the present invention superimposed on each other.
6 is a flowchart showing an embodiment of a micro-pulse device control method according to the present invention.

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

2 is a block diagram showing an embodiment of a micro-pulse device according to the present invention.

2, the micropulse apparatus 100 according to the present invention includes a pulse voltage generator 200, a DC voltage generator 300, and a dust collector 400.

The pulse voltage generating unit 200 includes a first DC power supply unit 210, a pulse circuit unit 220 and a transforming unit 230. The pulse voltage generating unit 200 generates a pulse voltage using the voltage supplied from the first DC power supply unit 210 .

The first DC power supply unit 210 receives power from an external power supply and outputs DC power to the pulse circuit unit 220.

In one embodiment, the first DC power supply 210 may be a capacitor charge power supply (CCPS). Although not shown in detail, the capacitor charging power supply may include an inverter controller and a small high frequency step-up transformer.

In one embodiment, the first DC power supply 210 may have a power factor of 0.9 or higher and a ripple rate within 1%. The first DC power supply unit 210 may have a higher power factor and less ripple ratio than the conventional three-phase transformer and the three-phase rectifier.

The pulse circuitry 220 may include a first resistor 221, a first reactor 223, a first capacitor 225, a first diode 227, and a switch 229, in one embodiment . However, the present invention is not limited to the pulse circuit unit 220 according to the present invention.

The first resistor 221 is connected in series to the first DC power supply unit 210 to limit a current output from the first DC power supply unit 210.

The first reactor 223 is connected in series between the first resistor 221 and the first capacitor 225 and resonates with the first capacitor 225. The first reactor 223 controls the charging current and the discharging current of the first capacitor 225.

The first capacitor 225 is connected in series to the first reactor 223, discharges the charging voltage to the first reactor 223, and resonates with the first reactor 223.

The first diode 227 is connected in parallel to the first capacitor 225 to block the counter electromotive force.

A switch 229 is connected in parallel to the first reactor 223 and the first capacitor 225 to control charging and discharging of the first capacitor 225. In one embodiment, the switch 229 may be formed using a switching device such as an IGBT and a FET.

The pulse circuit unit 220 includes a first reactor 223 and a switch 229 connected in parallel to the first capacitor 225. When the switch 229 is turned off, A voltage supplied from the first capacitor 210 is applied to the first capacitor 225 to charge the first capacitor 225. When the switch 229 is turned on, 1 reactor 223 to generate the pulse voltage.

Please refer to FIG. 3 and FIG. 4 to explain this in more detail.

3 and 4 are diagrams illustrating a switching operation for generating a pulse voltage of the micro-pulse device according to the present invention.

3, when the switch 229 is turned off, the voltage supplied from the first DC power supply 210 passes through the first resistor 221, the first reactor 223, and the first capacitor 225 in order do. At this time, the first capacitor 225 is charged to a predetermined voltage.

4, when the switch 229 is turned on, the voltage supplied from the first DC power supply unit 210 is turned off, and the charging voltage of the first capacitor 225 is applied to the first reactor 223.

The pulse circuit section 220 repeats on / off of the switch 229 to generate a pulse voltage.

2, the transforming unit 230 includes a pulse circuit unit 220 for generating the pulse voltage and a pulse voltage generator 220 for generating the pulse voltage output from the pulse circuit unit 220, And the step-up ratio is increased.

The transforming unit 230 applies the output of the pulse circuit unit 220 to the primary side and outputs the pulse voltage boosted to the high voltage to the secondary side. The boosted pulse voltage is applied to the dust collector 400.

The DC voltage generating unit 300 includes a second DC power supply unit 310 and a DC circuit unit 320 and generates a pulse voltage using a voltage supplied from the second DC power supply unit 310.

The second direct current power source unit 310 receives the power from the external power source and outputs the direct current power to the direct current circuit unit 320.

In one embodiment, the second DC power supply 310 may be a capacitor charge power supply (CCPS). Although not shown in detail, the capacitor charging power supply may include an inverter controller and a small high frequency step-up transformer.

In one embodiment, the second DC power supply 310 may have a power factor of 0.9 or higher and a ripple rate of less than 1%. The second direct current power source unit 310 can have a higher power factor and less ripple ratio than the prior art three phase transformer and the three phase rectifier.

The DC circuit portion 320 includes a second resistor 321, a second reactor 323, a second capacitor 325, and a second diode 327 in one embodiment.

The second resistor 321 is connected in series to the second DC power supply 310 to limit the current output from the second DC power supply 310.

The second reactor 323 is connected to one end of the second resistor 321 and one end of the dust collector to limit a change in current. Further, the second reactor 323 couples the DC voltage to the dust collector.

The second capacitor 325 is connected to one end of the second resistor 321 and the other end of the dust collector.

The second diode 327 is connected in parallel to the second capacitor 325 to prevent reverse voltage application.

The electrostatic precipitator (ESP) 400 is connected to the pulse voltage generator 200 and the DC voltage generator 300 to remove dust using the DC voltage and the pulse voltage including a modulatable frequency, do.

The dust collecting unit 400 forms the DC voltage having a negative voltage between the discharge electrode and the dust collecting plate, and then removes the dust by superposing the pulse voltage having a short voltage having a positive voltage.

The dust collecting unit 400 may form a direct current voltage between the discharge electrode and the dust collecting plate, which is a starting voltage, and apply a short pulse voltage to the dust collecting unit 400 to remove the dust. At this time, the DC voltage forms a fixed electric field between the discharge electrode and the dust collecting plate, and dust scattered on the dust collecting plate can be prevented from being scattered. The pulse voltage may include a variable pulse frequency, and the suspended dust may be charged and moved to the collection plate.

Although not shown, the controller sets the pulse frequency of the DC voltage, the pulse voltage, and the pulse voltage as the operation parameters, and varies the operation parameters according to the outlet dust concentration of the dust collector to efficiently remove the dust .

The controller is capable of variably controlling the operating parameters in accordance with changes in the surrounding conditions during operation of the micro-pulse device. For example, when the amount of dust increases with an increase in the load to be treated, when the charging stoppage time due to an unstable operation state such as a spark in the micropulse unit increases, and when the collected dust is scattered again on the dust collecting plate, The operation parameters are readjusted according to the surrounding situation, such as when the intermittent dust concentration increases due to the operation of the machinery.

Operation parameters that are readjusted depending on the type of the surrounding situation may be different. For example, it may be advantageous to change the DC voltage in situations involving re-arcing, and it may be advantageous to change the pulse voltage and pulse frequency when the load increases and the collection rate falls.

This is related to the energy delivered inside the dust collector. For example, the energy transferred to the inside of the dust collecting part can be expressed by the following equation (1).

[Equation 1]

DC charge energy = (DC voltage * DC current) 2

Pulse charge energy = (1/2 * capacitance * pulse voltage 2 * pulse frequency) 2

The controller can control the dust collection performance of the dust collection unit by adjusting the operation parameters using Equation (1).

5 is a diagram showing a DC voltage and a pulse voltage of the micro-pulse device according to the present invention superimposed on each other.

As shown in FIG. 5, a DC voltage and a pulse voltage are superimposed on the dust collecting part. In one embodiment, the DC voltage may be a negative voltage of several tens kV, and the pulse voltage may be a positive voltage of several kV. Further, the pulse voltage may have a predetermined period (for example, several us).

The dust collecting unit can remove dust by superimposing a pulse voltage (VPS) having a short width (for example, 90 to 120 mu s) after setting a DC voltage (VDC) as an initial voltage between the discharge electrode of the dust collecting unit and the dust collecting plate.

The dust collecting part independently applies two different charge (DC voltage and pulse voltage) so that gas molecules having a high electronegativity react with electrons to generate negative ions, and the dust is charged by negative ions to move to the dust collecting electrode And is collected by the dust collecting plate and then removed by a mechanical exhausting apparatus.

≪ Control method of micro-pulse device >

6 is a flowchart showing an embodiment of a micro-pulse device control method according to the present invention.

As shown in FIG. 6, first, the voltage supplied from the first DC power supply unit is switched to generate a pulse voltage capable of frequency modulation (S1100).

In one embodiment, the step of generating a pulse voltage S1100 includes turning off a switch connected in parallel to the first reactor and the first capacitor so that a voltage supplied from the first DC power supply is applied to the first capacitor, The first capacitor may be charged and the switch may be turned on to apply the charging voltage of the first capacitor to the first reactor to generate the pulse voltage.

In one embodiment, the step of generating a pulse voltage (S1100) may increase the pulse voltage generated in the pulse circuit portion by using a transformer.

In detail, in one embodiment, when the switch is turned off, the voltage supplied from the first DC power supply unit passes through the first resistor, the first reactor, and the first capacitor in order. At this time, the first capacitor is charged to a predetermined voltage.

When the switch is turned on, the voltage supplied from the first DC power supply flows along the switch, and the charging voltage of the first capacitor is applied to the first reactor.

As the ON / OFF operation of the switch is repeated, the first reactor and the first capacitor form a resonant circuit, and the output of the first DC power supply section is modulated into a pulse voltage having a predetermined frequency.

Next, a DC voltage higher than the pulse voltage is generated using the voltage supplied from the second DC power supply (S1200). However, the control method of the micro-pulse device according to the present invention is not necessarily limited to this, but it is also possible that the control method of the micro-pulse device according to the present invention is not necessarily limited thereto, .

In one embodiment, the pulse voltage may be a few kV, and the dc voltage may be a few ten kV.

In one embodiment, the direct current power output from the second direct current power source is coupled to the dust collector by the second reactor. At this time, the second reactor may block the high frequency generated in the pulse voltage.

Next, the pulse voltage having a positive voltage is superposed on the DC voltage having a negative voltage to remove dust (S1300).

A DC voltage and a pulse voltage are superimposed on the dust collecting part. In one embodiment, the DC voltage may be a negative voltage of several tens kV, and the pulse voltage may be a positive voltage of several kV. Further, the pulse voltage may have a predetermined period (for example, several us).

The dust collecting unit can remove dust by superimposing a pulse voltage (VPS) having a short width (for example, 90 to 120 mu s) after setting a DC voltage (VDC) as an initial voltage between the discharge electrode of the dust collecting unit and the dust collecting plate.

The dust collecting part independently applies two different charge (DC voltage and pulse voltage) so that gas molecules having a high electronegativity react with electrons to generate negative ions, and the dust is charged by negative ions to move to the dust collecting electrode And is collected by the dust collecting plate and then removed by a mechanical exhausting apparatus.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Micro-pulse device 200: Pulse voltage generator
210: first DC power supply 220: pulse circuit
221: first resistor 223: first reactor
225: first capacitor 227: first diode
229: Switch 230: Transformer
300: DC voltage generating unit 310: Second DC power supply unit
320: DC circuit part 321: Second resistance
323: second reactor 325: second capacitor
327: second diode 400: dust collecting part

Claims (8)

A pulse voltage generating unit including a first DC power supply unit and generating a pulse voltage using a voltage supplied from the first DC power supply unit;
A DC voltage generating unit including a second DC power supply unit and generating a DC voltage using a voltage supplied from the second DC power supply unit; And
And a dust collecting part connected to the pulse voltage generating part and the DC voltage generating part to remove dust using the DC voltage and the pulse voltage including a modulatable frequency,
Wherein the pulse voltage generator comprises:
A pulse circuit portion for generating the pulse voltage; and a transformer formed between the dust collecting portion and for boosting the pulse voltage output from the pulse circuit portion at a predetermined ratio. The method according to claim 1,
Wherein the first DC power supply unit and the second DC power supply unit are air-cooled capacitor charge power supply units (CCPS). The method according to claim 1,
Wherein the pulse voltage generator comprises:
And a switch connected in parallel to the first reactor and the first capacitor,
When the switch is turned off, a voltage supplied from the first DC power supply is applied to the first capacitor to charge the first capacitor,
Wherein when the switch is turned on, a charge voltage of the first capacitor is applied to the first reactor to generate the pulse voltage. The method according to claim 1,
Wherein the pulse voltage generating section includes a pulse circuit section,
The pulse circuit section includes:
A first resistor connected in series to the first DC power supply;
A first reactor connected in series to the first resistor;
A first capacitor connected in series to the first reactor to discharge a charging voltage to the first reactor;
A first diode connected in parallel to the first capacitor to block a counter electromotive force; And
And a switch connected in parallel to the first reactor and the first capacitor to control charging and discharging of the first capacitor,
Wherein the first reactor controls a charge current and a discharge current of the first capacitor. The method according to claim 1,
Wherein the DC voltage generating unit includes a DC circuit unit,
The direct-
A second resistor connected in series to the second DC power supply;
A second reactor connected to one end of the second resistor and one end of the dust collector to limit a change in current;
A second capacitor connected to one end of the second resistor and the other end of the dust collector; And
And a second diode connected in parallel to the second capacitor to prevent reverse voltage application. The method according to claim 1,
Wherein the dust-
Wherein the DC voltage having a negative voltage is formed between the discharge electrode and the dust collecting plate, and then the pulse voltage having a positive voltage is superimposed to remove the dust. The method according to claim 1,
The first DC power supply unit and the second DC power supply unit
A power factor of 0.9 or more and a ripple ratio within 1%. A switch connected in parallel to the first reactor and the first capacitor is turned off to apply a voltage supplied from the first DC power supply unit to the first capacitor to charge the first capacitor and turn on the switch to charge the first capacitor, Generating a pulse voltage by applying a voltage to the first reactor;
Generating a DC voltage higher than the pulse voltage by using a voltage supplied from a second DC power supply; And
And superimposing the pulse voltage having a positive voltage on the DC voltage having a negative voltage to remove dust.
KR1020120157893A 2012-12-31 2012-12-31 Micro Pulse System and method for controlling the same KR20140087514A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190136549A (en) * 2018-05-31 2019-12-10 주식회사 엔아이티코리아 An Electric Dust Collecting Apparatus Having a Structure of Blocking a Power Automatically

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190136549A (en) * 2018-05-31 2019-12-10 주식회사 엔아이티코리아 An Electric Dust Collecting Apparatus Having a Structure of Blocking a Power Automatically

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