TW201924780A - Power supply device of electric dust collector supplies a pulsed power to improve the collection efficiency of the electric dust collector and miniaturize the electric dust collector - Google Patents

Abstract

The power supply device of electric dust collector includes a power supply unit; a noise cutting-off unit; a power converting unit; a reactor unit for limiting a current based on the DC power supply and sensing an arc-generation-condition current signal of the electric dust collector; a boosting unit for firstly boosting the output of the reactor unit and sensing an arc-generation-condition voltage signal of the electric dust collector; a rectification applying unit for secondly boosting the output of the boosting unit, converting it into a pulsed power via the rectification, charging and discharging, applying the pulsed power to the electric dust collector, and sensing a state current signal, a state voltage signal and a spark signal of the electric dust collector; a signal converting unit for converting the arc-generation-condition current signal, the arc-generation-condition voltage signal, the state current signal, the state voltage signal and the spark signal; and a control unit that controls the power converting unit, confirms the frequency of spark of the electric dust collector and the arc generation condition according to the signals of the signal converting unit.

Description

Power supply device of electric dust collector

The invention relates to a power supply device for an electric dust collector.

The dust collector is a device that treats various kinds of dust or dust generated by various work activities in order to prevent environmental pollution or maintain the cleanliness of the working space, improve the working environment and the health of workers. Various methods are used for this type of dust collector, such as a method using a filter element or a screen, a method using gravity or inertial force, a centrifugal force, a method using electrical properties, or a method using an adsorption force such as water or oil.

Generally, an electric dust collector uses a corona discharge to apply electric charges to dust in a gas, and separates and traps the gas through the action of an electric field. It is widely used in thermal power plants, steel plants, metal processing industries, cement, and gas. , Sulfuric acid manufacturing industry, etc. to prevent air pollution and recover valuables. Recently, restrictions on dust emission concentration and fine dust have been strengthened. Therefore, it is necessary to improve the dust collection efficiency of the electric dust collector.

The basic structure of such an electric dust collector includes a discharge discharge electrode, a dust collection plate that captures dust charged through the discharge, and a power supply device for applying a voltage between the discharge electrode and the dust collection plate. . When the speed of dust reaching the dust collecting plate is fast or the dust collecting area is large or the gas velocity is slow, the dust collecting efficiency of such an electric dust collector increases.

However, when the area of the dust collecting plate is increased or the gas velocity is decreased in order to improve the dust collection efficiency, not only the cost increases, but also the installation area needs to be increased. Therefore, there are difficulties in application.

To solve such a problem, Korean Laid-Open Patent No. 2017-0064109 discloses a power supply device for an electric dust collector capable of improving dust collection efficiency by supplying an intermediate frequency power supply to the electric dust collector.

However, even if an intermediate frequency power source is supplied to the electric dust collector, there are still spatial constraints related to the size of the electric dust collector.

Therefore, in order to improve the dust collection efficiency of the electric dust collector, it may be considered to improve the power supply device.

Know-how

Patent literature

(Patent Document 1) Korean Granted Patent No. 0575271 (published on May 02, 2006).

(Patent Document 2) Korean Published Patent No. 2017-0064109 (published on June 9, 2017).

technical problem

The present invention aims to solve the above problems, and provides a power supply device for an electric dust collector that supplies a pulsed power source to an electric dust collector to improve the dust collection efficiency of the electric dust collector and miniaturize the electric dust collector.

The technical problems to be solved by the present invention are not limited to those described above, and those skilled in the art can clearly understand other technical problems that are not described in the following description.

Technical solutions

A power supply device for an electric dust collector according to an embodiment of the present invention for solving the above technical problems is a power supply device for an electric dust collector that supplies power to the electric dust collector, and includes a power supply unit that supplies a commercial frequency AC power supply; noise cut-off section, which cuts off the noise of AC power; power conversion section, which converts AC power to DC power, modulates to high frequency, suppresses resonance caused by high frequency; reactor section, which limits Based on the current of the DC power source, the arc generating condition current signal of the electric dust collector is sensed; the booster unit, the output of the primary boost reactor unit, senses the arc generating condition voltage signal of the electric dust collector; the rectification applying unit The output of its secondary boosting and boosting part is converted into pulsed power through rectification, charge and discharge, and the pulsed power is applied to the electric dust collector to sense the state current signal, state voltage signal and spark signal of the electric dust collector; A signal conversion unit that converts an arc occurrence condition current signal, an arc occurrence condition voltage signal, a state current signal, a state voltage signal, and a spark signal; and a control unit that Signal conversion unit converting power control unit, to confirm the electric precipitator spark arcing times and conditions.

Preferably, the power conversion unit may include: a bridge diode element that rectifies the AC power source; a smoothing capacitor that smoothes the rectified pulse current; an insulated gate bipolar transistor (IGBT) element that smoothes the pulse current Modulation to high frequencies; and resonance capacitors that remove resonances induced by high frequencies.

Preferably, the power conversion unit can convert a commercial frequency to a high frequency of 20 kHz.

Preferably, the control unit can control the voltage and current by adjusting the gate angle of the insulated gate bipolar transistor (IGBT) element.

The rectifying applying section may include a rectifying diode element for rectifying the output of the secondary boost and a charging and discharging capacitor for charging and discharging.

Preferably, the rectification applying section may include a signal board having a sensing resistor for measuring a state current signal, a frequency divider for measuring a state voltage signal, and a signal amplifier for sensing a spark Signal.

Preferably, the signal conversion section may include: a buffer circuit that removes a surge of a state current signal, a state voltage signal, and a spark signal.

Preferably, the control unit may control the power conversion unit to reduce an input applied to the electric dust collector in a case where the number of spark occurrences exceeds a reference number of times within a predetermined period of time.

Preferably, the control unit may control the power conversion unit to increase an input applied to the electric dust collector when the number of spark occurrences is equal to or less than the reference number of times within a predetermined period of time.

Preferably, the control unit may control the power conversion unit to cut off an input applied to the electric dust collector when an arc generating condition of the electric dust collector is sensed.

Preferably, the power supply device of the electric dust collector may further include: an insulating portion that cuts off noise caused by sparks generated from the electric dust collector and cuts off the exterior of the electric dust collector.

Please refer to the detailed description and drawings for other specific matters of the present invention.

Technical effect

According to the present invention, it is possible to improve the dust collection efficiency of the electric dust collector by supplying the pulse power to the electric dust collector.

In addition, by reducing the dust collection area required by improving the dust collection efficiency of the electric dust collector, the size of the electric dust collector can be reduced and costs can be saved.

In addition, since the discharge voltage is increased by supplying a pulse power supply to the electric dust collector, it is possible to achieve excellent dust collection efficiency at a flow rate faster than that of the conventional dust collector.

The preferred embodiments of the present invention will be specifically described below with reference to the drawings. The advantages, features, and methods of achieving the present invention will be made clear with reference to the drawings and the embodiments described below. However, the present invention is not limited to the embodiments disclosed below, but is implemented in different forms. This embodiment merely makes the disclosure of the present invention more complete, and makes it easy for a person skilled in the art to which the present invention pertains to understand the scope of the invention. The invention is defined by the scope of the technical solution. Throughout the description, the same drawing symbols indicate the same constituent elements.

Although “first”, “second”, and the like are used to describe various elements, constituent elements, and / or members, these elements, constituent elements, and / or members are not limited to these terms. These terms merely distinguish one element, constituent element, or component from other elements, constituent elements, or components. Therefore, the first element, the first constituent element, or the first member described below may be the second element, the second constituent element, or the second member within the technical idea of the present invention.

The terminology used in this specification is used to explain the embodiments, but not to limit the present invention. In this specification, a singular type sentence includes a plural type without a special record. The use of "comprises" and / or "made of" in the description does not exclude one or more other constituent elements, steps, actions, and / or elements other than the stated constituent elements, steps, actions, and / or elements. Or the presence or addition of elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification can be used in accordance with the meaning commonly understood by those having ordinary knowledge in the technical field to which the present invention belongs. Moreover, the commonly used dictionary-defined terms shall not be interpreted as weird or transitional formal meanings without a clear special definition.

Hereinafter, the present invention will be described more specifically with reference to the drawings.

FIG. 1 is a schematic block diagram of a power supply device for an electric dust collector according to an embodiment of the present invention. FIG. 2 is a perspective view showing an example of a power supply device of the electric dust collector shown in FIG. 1. 3 is a conceptual diagram showing a specific configuration of a signal conversion unit of the power supply device of the electric dust collector shown in FIG. 1. FIG. 4 is a conceptual diagram showing a specific configuration of the conversion circuit of FIG. 3.

Referring to FIG. 1, a power supply device 100 for an electric dust collector according to an embodiment of the present invention may include: a power supply unit 110 that supplies an impulse power to the electric dust collector 10, a noise cutoff unit 120, and a power supply. The conversion unit 130, the reactor unit 140, the boosting unit 150, the rectification applying unit 160, the signal conversion unit 170, the control unit 180, the insulation unit 190, and the like.

The power supply unit 110 supplies an AC voltage at a commercial frequency. For example, the power supply unit 110 can supply a three-phase power source of 60 Hz and 460 V. The input end of such a power supply unit 110 includes a circuit breaker (MCCB; Molded case circuit breaker) and a fuse. The circuit breaker is activated for protection when an overcurrent occurs.

The noise cut-off section 120 cuts off noise from the AC power supply. For example, the noise cut-off section 120 may include an EMC / EMI filter and the like, and cut noise with the EMC / EMI filter.

The power conversion unit 130 converts the AC power to a DC power and modulates the AC power to a high frequency to suppress the occurrence of resonance due to the high frequency. To this end, the power conversion unit 130 may include a bridge diode element that rectifies the AC power source, a smoothing capacitor that smoothes the rectified pulse current, and an insulated gate bipolar transistor (IGBT) that modulates the smooth pulse current to a high frequency. ) Components, resonance capacitors that remove resonance due to high frequencies.

Specifically, the bridge diode element converts alternating current (AC) at a commercial frequency into direct current (DC).

In addition, the smoothing capacitor smoothes the pulse current rectified in the bridge diode element. In addition, the IGBT element is modulated to a high frequency. The IGBT element can adjust a gate angle according to a gate adjustment control signal of the control unit 180 to control the voltage and current applied to the boosting unit 150. In order to enable the control unit 180 to adjust the gate angle of the IGBT element, the front-end current and the back-end current of the IGBT element are measured and the measured current values are sent to the control unit 180.

In addition, the resonance capacitor removes resonance caused by high frequencies in the output of the IGBT element.

The commercial frequency is converted into a high frequency of 20 kHz by the operation of the power conversion unit 130. The high frequency converted to 20 kHz can adjust the output adjustment value in a shorter time than the time from the spark to the arc. In addition, by converting to a high frequency of 20 kHz, it is possible to ensure the re-output time after the discharge output is turned off.

The reactor unit 140 limits a current based on a DC power source and senses an arc generation condition current signal of the electric dust collector 10. The arc generation condition can be used to sense the arc generation condition of the electric dust collector 10.

The boosting unit 150 boosts the output of the reactor unit 140 once to sense the arc generation condition voltage signal of the electric dust collector 10. The arc generation condition of the electric dust collector 10 can be sensed using the arc generation condition voltage signal. The step-up unit 150 may be a high-frequency step-up transformer, which can increase the commercial voltage by a factor of 1: N.

The output of the rectification applying unit 160 is boosted twice by the boosting unit 150 and converted into a pulse power source through rectification, charging and discharging, and the pulse power source is applied to the electric dust collector 10. The rectification applying section 160 can increase the output of the boosting section 150 by N times, and can rectify the output of the secondary boosting through the rectifying diode element, and charge and discharge with a charge and discharge capacitor. To this end, the rectifying applying section 160 may include a rectifying diode element for rectifying the output of the secondary boost and a charging and discharging capacitor for charging and discharging. The size of the step-up unit 150 can be reduced by the operation of the rectification applying unit 160, and the spark generation voltage of the electric dust collector 10 can be increased. The rectification applying unit 160 converts the pulses into pulses and applies them to the discharge electrode and the dust collecting plate of the electric dust collector 10 to perform electric dust collection.

In addition, the rectification applying unit 160 senses a state current signal, a state voltage signal, and a spark signal of the electric dust collector 10. To this end, the rectification applying unit 160 may include a sensing resistor and a divider for measuring the state current signal and a state voltage signal, and a signal board having a signal amplifier for sensing the spark signal. board). For example, an N: 1 frequency divider may be connected in parallel to the electric dust collector 10.

The signal conversion unit 170 converts an arc occurrence condition current signal, an arc occurrence condition voltage signal, a state current signal, a state voltage signal, and a spark signal. The signal conversion unit 170 eliminates surges and converts signals so that the control unit 180 and the like can read. Here, the signal conversion unit 170 may include a state current signal, a state voltage signal, and a snubber circuit for removing a surge of a spark signal. In addition, the signal conversion unit 170 may generate an arc generation condition signal of the electric dust collector 10 based on the arc generation condition current signal and the arc generation condition voltage signal and send it to the control unit 180. Cutting off and adjusting the discharge output after sensing sparks and arcs does not prevent the transition from sparks to arcs, but since the arc generation condition signal can be generated through the signal conversion section 170, the conditions before the arcs can be predicted, and therefore the transition from sparks can be prevented To the arc.

The specific configuration of the signal conversion section 170 will be described later in detail.

The control unit 180 controls the power conversion unit 130 based on the signal from the signal conversion unit 170. For example, the control unit 180 operates through a program of a programmable logic controller (PLC: Programmable Logic Controller), and the voltage control and frequency modulation of the power conversion unit 130 are also controlled by the PLC through control signals. The operating current of the dust collector 10 is operated at a constant current. In addition, the control unit 180 confirms the number of sparks and the arc generation conditions of the electric dust collector 10 based on the signals from the signal conversion unit 170. When there are large water particles that can be affected when electric power is applied to the electric dust collector 10, sparks and arcs can occur, and the electric dust collector 10 can be damaged when sparks and arcs occur. It may even cause a fire, so it is necessary to confirm the number of sparks and the conditions of arc generation to control the power conversion unit 130. Here, the control unit 180 can control the voltage and the current by adjusting the gate angle of the IGBT element of the power conversion unit 130, so that the current of the dust collection unit of the electric dust collector 10 is operated at a constant current.

Specifically, the control unit 180 may control the output of the discharge unit by detecting a spark that occurs when an abnormality occurs in the dust collection unit during operation, or sense an arc occurrence condition and cut off the input to prevent the arc from occurring and send an alarm signal.

For example, the control unit 180 may control the power conversion unit 130 to reduce the input applied to the electric dust collector 10 when it is sensed that a spark has occurred and the number of sparks of the electric dust collector 10 exceeds a reference number within a predetermined period of time. . After that, the control unit 180 may control the power conversion unit 130 to increase the input applied to the electric dust collector 10 when the number of spark occurrences is equal to or less than the reference number of times within a predetermined period of time.

In addition, the control unit 180 may control the power conversion unit 130 to cut off an input applied to the electric dust collector 10 when an arc generation condition of the electric dust collector 10 is sensed. After that, when the arc generation condition of the electric dust collector 10 is eliminated, the control unit 180 applies a normal input to the electric dust collector 10 so that the electric dust collector 10 operates normally. If the arc generation condition is not eliminated, the power conversion unit 130 may be controlled so that the input to the electric dust collector 10 is reduced.

The insulating portion 190 cuts off noise caused by sparks or the like generated in the electric dust collector 10 from the outside of the electric dust collector 10. For example, the output of the step-up rectified power supply (-) may use a high-voltage bushing for high voltage. For example, in the assembled form of the ceramic insulator and the epoxy resin plate, noise inside the electric dust collector 10 is cut off to prevent application to the power supply device 100 when a spark occurs.

Referring to FIG. 2, the power supply device 100 of the electric dust collector can be modularized to facilitate installation and management.

As shown in FIG. 2, each component of the power supply device 100 can be divided into three spaces and arranged in the housings 51, 52, and 53 according to functions, so that the space-constrained electric dust collector 10 can be reduced.

The power supply unit 110, the noise cut-off unit 120, the power conversion unit 130, the reactor unit 140, the booster unit 150, the rectification application unit 160, the signal conversion unit 170, and the control can be used as each component of the power supply device 100 The part 180, the insulating part 190, and the like are modularized and arranged in a panel type or a board type.

The first casing 51 is used to configure a circuit breaker module 115 having a circuit breaker and a fuse, a step-up transformer 155, a pulse conversion and signal board module 165, a signal conversion board module 175, and a control board module 185.

The second housing 52 is used to configure the EMC / EMI filter 125, a power conversion module 135 including a working element module 135A having a bridge diode element and an IGBT element, a smoothing capacitor 135B and a resonance capacitor 135C, and a reactor (reactor ) 145.

The third casing 53 is provided with a high-voltage bushing 195 for insulation.

In the case where filters, diode elements, IGBT elements, capacitors, reactors, and other components that need to be replaced periodically are additionally arranged in the second housing 52, it is not only easy to install, but also easy to replace components that have failed or have reached their end of life.

In addition, the noise generated in the electric dust collector 10 can be cut off only by disposing the high-voltage bushing 195 on the third casing 53, and it is convenient to increase the insulator capacity of the insulating portion 190 or replace the insulating portion 190.

In addition, by arranging circuit breakers, boosters, signal boards, control boards, and the like in the power supply device 100 having a long service life and having a great influence on the overall operation, the first casing 51 can maximize the operating efficiency of the power supply device 100. .

Specifically, when a main power supply (not shown) is applied with an AC 440V power source, the circuit breaker module 115 of the first case 51 cuts off an overcurrent, and if the current is not an overcurrent, the current is applied to the EMC / The EMI filter 125 flows. Here, the AC 440V power supply is transformed into 220V by another pressure reducer, and can be used as a room cooler, a converter power supply, or the like.

The EMC / EMI filter 125 removes noise so that the commercial frequency maintains a predetermined waveform. An AC power source of a commercial frequency that maintains a predetermined waveform is converted into DC by the bridge diode element of the working element module 135A of the second housing 52 and flows to the smoothing capacitor 135B to smooth the pulse current. The IGBT element retransmitted through the working element module 135A is modulated to a high frequency. Here, for pulse conversion and modulation to a high frequency of 20 kHz, the control board module 185 can control the current and voltage applied to the electric dust collector 10 by controlling the gates of the IGBT elements. Resonance can occur when the IGBT element is modulated to a high frequency, so this is sent to the resonance capacitor 135C to eliminate the occurrence of resonance. In addition, the reactor 145 limits the current, and the arc current signal of the electric dust collector 10 can be sensed based on the current of the reactor 145.

The high-frequency current flowing through the reactor 145 is re-input to the step-up transformer 155 of the first case 51, and the voltage is increased by N times. In addition, the high-frequency boosted N times increases the voltage several times through the pulse conversion and signal board module 165, and the diode elements and capacitors in the pulse conversion and signal board module 165 can be used to rectify and charge and discharge to convert into pulses. . Here, in order to confirm the voltage and current applied to the dust collecting part of the electric dust collector 10, a frequency divider and a sense resistor located in the pulse conversion and signal board module 165 are used, and a pulse conversion is used to sense the spark signal. And the signal amplifier of the signal board module 165. Since the pulse conversion and the signal board module 165 can be boosted twice, the size of the boost transformer 155 that performs a boost can be reduced.

The pulse power converted by the pulse conversion and signal board module 165 is applied to the electric dust collector 10, and the signal conversion board module 175 of the first housing 51 senses and converts the applied voltage, current, and spark signal of the electric dust collector 10. , Arc signals, etc. The control of the voltage and current applied to the entire electric dust collector 10 is controlled by the control board module 185 of the first casing 51.

Referring to FIGS. 3 and 4, the signal conversion section 170 converts an arc occurrence current signal, an arc occurrence voltage signal, a state current signal, a state voltage signal, and a spark signal.

The reactor unit 140 senses an arc-generating condition current signal, and the boost unit 150 senses an arc-generating condition voltage signal. Such a signal can affect the power supply device 100 or the electric dust collector 10. Therefore, in order to prevent these, a fuse may be arranged at the front Device 1701 to cut off overvoltage and overcurrent. Further, the bridge diode element 1702 performs rectification, and the capacitor 1703 smoothes the pulse current. The comparator 1704 compares the rectified current value and the arc current reference value 1705, and the rectified voltage value and the arc voltage reference value 1706. And (AND) logic gate 1707 confirms the compared current signal and voltage signal to confirm whether it is an arc generation condition. That is, when the arc generation condition current signal exceeds the arc current reference value 1705, and the arc generation condition voltage signal exceeds the arc voltage reference value 1706 (in the case of an AND condition), it is determined as an arc generation condition. Then, it is transmitted to the control unit 180 as an arc generation condition signal through the conversion circuit 1708. Therefore, it is possible to sense the arc generation condition in advance through the hardware circuit to cut off the output before the arc occurs. This can prevent the transition from the spark generation phase to the arc generation phase.

Here, as shown in FIG. 4, the conversion circuit 1708 may have two resistors R1, R2, and one capacitor C. The conversion circuit 1708 can control the cut-off time and re-output time from spark to arc arc by hardware by adjusting the values of two resistors R1, R2 and one capacitor C.

The rectification applying unit 160 enables the current and voltage of the electric dust collector 10 to be sensed through the sensing resistor 166 and the frequency divider 167, respectively. Then, the rectification applying unit 160 amplifies the spark signal with a signal amplifier 168. The signal of the rectification applying unit 160 is converted by the signal conversion unit 170. The line filter 1711 filters the noise of the current flowing through the sensing resistor 166, the buffer circuit 1712 removes the surge voltage, and the ammeter 1713 measures the state current signal of the electric dust collector 10. The line filter 1711 filters the noise of the voltage of the frequency divider 167, the buffer circuit 1712 removes the surge voltage, and the voltmeter 1714 measures the status voltage signal of the electric dust collector 10. The buffer circuit 1712 removes the surge voltage of the signal amplified by the signal amplifier 168, the photo sensor 1715 senses the spark signal, and removes the surge voltage again through the buffer circuit 1712. It is preferable that all of the circuit front ends of the rectification applying section 160 connected to the sense resistor 166, the frequency divider 167, and the signal amplifier 168 have a buffer circuit 1712 for coping with a surge voltage. The status current signal, status voltage signal, and spark signal converted and sensed by the signal conversion section 170 are transmitted to the control section 180.

Here, although not shown in the drawings, the signal conversion unit 170 may be connected to a rupture sensor, an oil level sensor, or the like that warns of an insulating oil spray accident, and may be connected to a transformer oil temperature sensor, The room temperature sensor is connected. The voltage, current, spark, arc, etc. of the electric dust collector 10 obtained by the signal conversion unit 170 and the cracking prompt, low oil level prompt, room temperature, transformer oil temperature, etc. are input to the control unit 180 as sensing signals.

In addition, the control unit 180 controls the power conversion unit 130 based on the voltage and current of the electric dust collector 10, an arc generation condition signal, and a spark signal using a control signal. For example, if a spark occurs, the control unit 180 counts the number of times, and when the predetermined number of times is reached within a predetermined period of time, the output is reduced by a predetermined amount and the electric dust collector 10 is operated to remove the generated spark ( Spark) to keep running smoothly. If there is no problem within the set time period, increase the output to restore and maintain the original running state. If a spark occurs after reducing the output by a predetermined amount, the output can be cut off and an alarm signal can be sent to the operator of the electric dust collector 10. In addition, the control unit 180 may cut off the output when a spark is generated and the arc generation condition is sensed, and it is known that the arc is likely to occur, and an alarm signal is issued to the operator of the electric dust collector 10. If the arc generation conditions have not been eliminated after the output is turned off, you can continue to cut off the discharge output or adjust the discharge output appropriately. If the arcing condition is eliminated after the output is turned off, normal operation is resumed. The specific operation of the electric dust collector 10 will be described in detail later.

FIG. 5 is a flowchart showing the operation of the power supply device of the electric dust collector according to the embodiment of the present invention.

Referring to FIG. 5, the power supply device 100 is a power source for starting the operation of the electric dust collector 10 and maintains the normal operation state of the electric dust collector 10 without detecting a spark (S11).

When it is sensed that a spark has occurred, the power supply device 100 is operated according to the number of sparks or whether an arc generation condition is sensed (S12). As the spark occurs, it is compared whether the number of sparks exceeds a predetermined reference number (S13). Here, if the number of sparks exceeds a predetermined reference number, an accident may occur. Therefore, the input of the power supply to the electric dust collector 10 is reduced to adjust the discharge output of the electric dust collector 10 (S17). That is, it operates at a voltage and current lower than the normal operation of the electric dust collector 10. After that, normal operation is resumed without sparks occurring for a predetermined period of time during low voltage and current operation. When the number of sparks is equal to or less than a predetermined reference number, the allowable range is maintained. Therefore, the normal operation state of the electric dust collector 10 is maintained (S11).

It is confirmed whether the arc occurrence condition current signal and the arc occurrence condition voltage signal exceed the arc current reference value and the arc voltage reference value, respectively, and it is sensed as to whether it is equivalent to the arc occurrence condition (S14). When an arc occurrence condition is sensed, the electric dust collector 10 is very likely to cause an accident such as a fire. Therefore, the input of the power supply to the electric dust collector 10 is cut off to cut off the electric dust collector 10 Discharge output (S15). Here, if the arc generation conditions remain unchanged, the state where the discharge output is cut off is maintained. After that, if the arc generation condition is reduced but the arc generation condition is not eliminated, the input of the power supply to the electric dust collector 10 is reduced to adjust the discharge output to operate (S17), and the arc generation condition is eliminated The normal operation state of the electric dust collector 10 is maintained (S11).

In particular, it can cause damage to the electric dust collector 10 when a condition of arcing is sensed, and even a fire may occur. Therefore, in order to ensure more stable operation, it is preferable to issue an alarm to this. In addition, when an arc generation condition is sensed and an arc has occurred, the power supply may be turned off to emergency stop the electric dust collector 10.

In the case of using the power supply device 100 of the electric dust collector, it is possible to improve the dust collection efficiency of the electric dust collector 10 by applying a pulsed power supply to the electric dust collector 10 and reduce the dust collection area required by the electric dust collector 10 Therefore, the size of the electric dust collector 10 can be reduced.

As an example, in the case of a commercial frequency (for example, 60 Hz) power supply, a spark occurs when the discharge voltage is 3 kv / ㎠ or higher. Therefore, in order to improve the dust collection efficiency, a dust collection area of about 1 CMM / 0.76 m2 is required. Using an intermediate frequency power supply of about 1000 ~ 2000Hz generates sparks at 4kv / ㎠ or more, so even if the dust collection area is reduced to about 1CMM / 0.36㎡, the same dust collection efficiency as the power supply of the existing electric dust collector can be achieved.

On the other hand, the power supply device 100 of the above-mentioned electric dust collector can apply a pulsed power source with a high frequency of 20 KHz to the electric dust collector 10, and sparks occur when the discharge voltage is above 5 kv / ㎠, so the dust collection area can be reduced to 1 CMM /0.18㎡. Therefore, compared with the area of a dust collector using a commercial frequency of 60 Hz or an intermediate frequency of about 1000 to 2000 Hz, the same efficiency can be obtained even if the area is reduced by 1/2 or more. In addition, since the discharge voltage is high, equivalent dust collection efficiency can be achieved even at a flow velocity (2 to 4 m / s) faster than the current velocity of the dust collection unit (1 to 2 m / s).

In particular, when a high-frequency 20KHz pulse power source is used, the discharge output value can be adjusted in a shorter time than the time from the spark to the arc. Therefore, the arc output condition is sensed in advance to cut off the discharge output before the spark to the arc. Therefore, the transition from spark to arc can be cut off in advance. On the other hand, without using a pulse power supply, the control period of the output operation is longer than the time from the spark to the arc, and the output is cut off after the arc is sensed. Therefore, the period of the discharge output and the period of adjusting the discharge output The time is too long to cut off the transition from spark to arc.

In addition, if the predetermined time is not ensured when the oscillation is output after the discharge output is turned off, the insulation resistance in the atmosphere may be low at the time of a spark, and therefore, a spark may occur again or an arc may occur. The high-frequency 20KHz pulse power supply can be used to ensure the re-output time after the discharge output is cut off, so it can fundamentally prevent the recurrence of sparks or arcs.

Fig. 6 is a block diagram of a control device that controls a power supply device of the electric dust collector of Fig. 1.

Referring to FIG. 6, a control device 200 that controls the power supply device 100 of the electric dust collector 10 is shown.

The control device 200 enables an operator to directly control the operation of the power supply device 100, and the operator inputs the control input portion 210 to control the power supply device 100 while checking the operation state through the control output unit 250. For example, the operable control input unit 210 uses the operating frequency applied to the electric dust collector 10 as a high-frequency pulse power source, and may set a warning to alert a dangerous situation or a reset warning. In addition, the dust collection system including the power supply device 100, the electric dust collector 10, and the like can be controlled by the control device 200, and the overall operation status of the dust collection system such as start and end can be controlled.

The control device 200 can communicate with the power supply device 100 through the control communication unit 220. For example, the control device 200 and the power supply device 100 can communicate through an RS-422 serial interface method. In addition, various communication methods can be selected by those skilled in the art.

In addition, the control device 200 can receive various data and information obtained from the power supply device 100 through the control communication section 220 and store the data and information in the control storage section 240. The control control section 230 analyzes these data and information as a basis for operating the power supply device 100 Use of data. As an example, all information related to the operation of the electric dust collector 10 and the power supply device 100, such as an operation state and an operation value, may be stored in the regulatory storage unit 240.

The control device 200 may be a separate device or a device provided on an external operation panel of the power supply device 100.

For example, a device provided on the external operation board of the power supply device 100 may be in the form of a PLC board, an integrated board PC, or the like.

In addition, the control device 200 in the form of a separate device can represent a general mobile communication terminal, 2G / 3G / 4G, a terminal capable of wireless broadband wireless network services, a Palm Personal Computer, and a personal digital assistant (PDA) as a whole. : Personal Digital Assistant), Smart phone, Wireless application protocol phone (WAP phone: Wireless application protocol phone), all wireless home appliances / communication devices with user interface, can be IEEE 802.11 wireless LAN card, etc. WLAN connected interface device. In addition, the control device 200 may be an information communication device such as a computer, a notebook, or a device including the mobile communication terminal.

When the control device 200 is a separate device, it is preferable that the control device 200 includes an authentication module. Authentication module uses text authentication module (mod_auth), Berkeley DB authentication module (mod_auth_db), database file (DBM) authentication module (mod_auth_dbm), anonymous authentication module (mod_auth_anon), Postgre SQL It is obvious to those skilled in the art that at least one authentication protocol in the authentication module and the XNS authentication service authenticates the user. The control device 200 can access the power supply device 100 only when the authentication is passed through the authentication module. Therefore, the security, confidentiality, and the like of the power supply device 100 can be maintained.

The embodiments of the present invention have been described above with reference to the drawings. However, those with ordinary knowledge in the technical field to which the present invention pertains can implement the present invention in other specific forms without changing the technical idea or necessary features of the present invention. Therefore, it should be understood that the embodiments described above are for exemplification in all aspects, but not for limitation.

10‧‧‧ Electric Dust Collector

51, 52, 53‧‧‧ shell

100‧‧‧ Power supply device

110‧‧‧Power Supply Department

115‧‧‧Circuit Breaker Module

120‧‧‧ Noise Cut-off Section

125‧‧‧EMC / EMI Filter

130‧‧‧Power Conversion Department

135‧‧‧Power Conversion Module

135A‧‧‧Working component module

135B‧‧‧Smoothing capacitor module

135C‧‧‧Resonant capacitor

140‧‧‧Reactor Department

145‧‧‧Reactor

150‧‧‧Boosting Department

155‧‧‧Boost transformer

160‧‧‧ Rectification applying section

165‧‧‧Signal board module

166‧‧‧sense resistor

167‧‧‧Frequency Divider

168‧‧‧Signal Amplifier

170‧‧‧Signal Conversion Department

1701‧‧‧ Fuses

1702‧‧‧Bridge Diode Element

1703‧‧‧Capacitor

1704‧‧‧ Comparator

1705‧‧‧arc current reference value

1706‧‧‧arc voltage reference value

1707‧‧‧Logic Gate

1708‧‧‧conversion circuit

1711‧‧‧line filter

1712‧‧‧Buffer Circuit

1713‧‧‧Ammeter

1714‧‧‧Voltmeter

1715‧‧‧Light Sensor

175‧‧‧Signal conversion board module

180‧‧‧Control Department

185‧‧‧control board module

190‧‧‧Insulation Department

195‧‧‧High-pressure casing

200‧‧‧Control device

210‧‧‧Regulatory Input Department

220‧‧‧Ministry of Regulation and Communications

230‧‧‧Regulatory Control Department

240‧‧‧Regulated Storage Department

250‧‧‧Regulated output department

C‧‧‧Capacitor

S11, S12, S13, S14, S15, S16, S17‧‧‧ steps

FIG. 1 is a schematic block diagram of a power supply device for an electric dust collector according to an embodiment of the present invention.

Fig. 2 is a perspective view showing an example of a power supply device of the electric dust collector shown in Fig. 1.

Fig. 3 is a conceptual diagram showing a specific configuration of a signal conversion section of a power supply device of the electric dust collector shown in Fig. 1.

FIG. 4 is a conceptual diagram showing a specific configuration of the conversion circuit of FIG. 3.

FIG. 5 is a flowchart showing the operation of the power supply device of the electric dust collector according to the embodiment of the present invention.

FIG. 6 is a block diagram showing a control device for controlling a power supply device of the electric dust collector shown in FIG. 1. FIG.

Claims (11)

A power supply device for an electric dust collector is used to supply power to an electric dust collector, and includes: a power supply unit that supplies an AC power source with a commercial frequency; a noise cutoff unit that cuts off Noise from an AC power supply; a power conversion unit that converts the AC power to a DC power supply and modulates it to a high frequency to suppress resonance caused by the high frequency; a reactor portion that limits the current based on the DC power supply. Measuring an arc occurrence condition current signal of the electric dust collector; a boosting unit which once boosts an output of the reactor portion to sense an arc occurrence condition voltage signal of the electric dust collector; a rectifying applying unit It boosts an output of the boosting unit for a second time, converts it into a pulse power source through rectification, charging and discharging, applies the pulse power source to the electric dust collector, and senses a state current signal of the electric dust collector, A status voltage signal and a spark signal; a signal conversion unit that converts the arc occurrence condition current signal, the arc occurrence condition voltage signal, the status current signal, the status voltage signal, and the spark signal; And a control unit that controls the power conversion unit according to the signal of the signal conversion unit to confirm the number of sparks and an arc generation condition of the electric dust collector. The power supply device for an electric dust collector according to item 1 of the scope of patent application, wherein the power conversion unit includes: a bridge diode element that rectifies the AC power source; a smoothing capacitor that makes a rectified pulse The flow is smooth; an insulated gate bipolar transistor element that modulates the smoothed pulse current to a high frequency; and a resonance capacitor that removes the resonance caused by the high frequency. The power supply device for an electric dust collector according to item 2 of the scope of patent application, wherein the power conversion section converts the commercial frequency to a high frequency of 20 kHz. According to the power supply device of the electric dust collector according to item 2 of the scope of the patent application, wherein the control section controls the voltage and current by adjusting the gate angle of the insulated gate bipolar transistor element. The power supply device for an electric dust collector according to item 1 of the scope of the patent application, wherein the rectifying applying section includes: a rectifying diode element for rectifying the output of the secondary boost; and a charge and discharge Capacitor for charging and discharging. The power supply device for an electric dust collector according to item 1 of the scope of the patent application, wherein the rectification applying section includes a signal board having: a sensing resistor for measuring the state current signal; A frequency divider for measuring the state voltage signal; and a signal amplifier for sensing the spark signal. According to the power supply device of the electric dust collector according to item 1 of the scope of the patent application, the signal conversion unit includes: a buffer circuit that removes the surge of the state current signal, the state voltage signal and the spark signal. The power supply device for an electric dust collector according to item 1 of the scope of patent application, wherein the control section controls the power conversion section to reduce the power supply to the electric power generator when the number of sparks exceeds a reference number within a predetermined period of time. Input applied by the dust collector. According to the power supply device of the electric dust collector according to item 8 of the scope of the patent application, wherein the control unit controls the power conversion unit to increase the power to the power supply unit when the number of spark occurrences is equal to or less than a reference number within a predetermined time period. Input applied by an electric dust collector. According to the power supply device of the electric dust collector according to item 1 of the scope of the patent application, wherein the control unit controls the power conversion unit to cut off the electric power conversion unit when the arc generating condition of the electric dust collector is sensed Input applied by an electric dust collector. The power supply device for an electric dust collector according to item 1 of the scope of the patent application, further comprising: an insulation section that cuts noise caused by sparks generated by the electric dust collector and cuts off the outer part of the electric dust collector. Off.