KR101979948B1 - Electrostatic Precipitator and Air Conditioner - Google Patents

Abstract

The present invention relates to a high voltage generator and an air conditioner.
The high voltage generator according to the present embodiment includes a DC voltage unit for outputting a DC voltage; A signal generator for generating a switching signal to be switched on or off based on the duty ratio set; A switch unit for switching the current based on the switching signal to convert the DC voltage into a pulse voltage; A timer for setting a time point for adjusting the duty ratio to increase the pulse voltage; A transformer for boosting the input pulse voltage according to a winding ratio; A control unit for adjusting the duty ratio when the time point reached by the timer is reached, and the control unit increases the duty ratio for a predetermined boosting time to increase the magnitude of the voltage output by the transformer.

Description

[0001] The present invention relates to a high voltage generator and an air conditioner,

The present invention relates to a high voltage generator and an air conditioner.

The air conditioner is a device for keeping the air in a predetermined space in a most suitable condition according to the purpose of use and purpose. Generally, the air conditioner includes a compressor, a condenser, an expansion device, and an evaporator, and a refrigeration cycle for compressing, condensing, expanding, and evaporating the refrigerant is driven to cool or heat the predetermined space have.

The predetermined space may be variously suggested depending on the place where the air conditioner is used. For example, when the air conditioner is installed in a home or an office, the predetermined space may be a house or an indoor space of a building.

When the air conditioner performs the cooling operation, the outdoor heat exchanger provided in the outdoor unit performs a condenser function, and the indoor heat exchanger provided in the indoor unit performs an evaporator function. On the other hand, when the air conditioner performs the heating operation, the indoor heat exchanger performs a condenser function, and the outdoor heat exchanger performs an evaporator function.

The air conditioner may be classified into an upright type, a wall-mounted type, or a ceiling type depending on the installation position. The upright type air conditioner is an air conditioner installed in an indoor space, and the wall-mounted type air conditioner can be understood as an air conditioner installed to be attached to a wall surface. The ceiling type air conditioner can be understood as an air conditioner of a ceiling type.

The air conditioner is provided with an electric dust collecting device for removing particulates such as dust in the air or smoke such as cigarette smoke using electrostatic separation. The electric dust collector generates a corona discharge by using a high voltage obtained by boosting the voltage of a commercial power source to remove particulates such as dust and cigarette smoke in the air sucked into the air conditioner.

1. Public number (public date): 10-2016-0006062 (January 18, 2016)

2. Description of the invention: Electrostatic precipitator and air conditioner having same

The electric dust collecting apparatus disclosed in the prior art includes a charging section for charging dust in the air and a plurality of discharge electrode plates spaced apart from each other and a path through which the dust particles charged by the charging section are passed between the plurality of discharge electrode plates And a second filter unit located downstream of the plurality of discharge electrode plates in the air flow direction and connected to the ground to form a corona discharge with the discharge electrode plate to collect the charged particles. With this arrangement, the dust particles charged by the charging section pass through the passage of the first filter section and are collected in the second filter section, and the dust particles charged between the first filter section and the second filter section are collected by the second filter It can be collected in the department. The second filter portion may be referred to as a dust collecting portion.

According to this prior art, a charge can be charged by applying a high voltage to the charging section of the electrostatic precipitator at a time when the voltage of the commercial power source is boosted. At this time, due to the high voltage, insulation of the air on the charging unit side may be destroyed and noise may be generated.

There is a problem that the noise may cause stress to the user. The stress caused by the noise may cause a sleeping disorder to the user or may act as a factor to prevent concentration during work.

Therefore, in order to reduce the noise, it is necessary to control so that the level of the voltage applied to the charging portion is gradually increased. However, in this case, since the time required for the electric dust collector to reach the voltage level at which the dust collecting efficiency expected by the user is reached is delayed, the foreign matter filtering performance is reduced.

In order to solve the above-mentioned problems, the present embodiment is directed to a method of controlling a voltage rising time of a voltage reaching a high voltage to be applied to a charging unit in order to reduce noise generated in a charging unit of a charging unit of an electric dust collector, A high voltage generator and an air conditioner.

In addition, the present invention provides a high voltage generator and an air conditioner using a duty ratio of a switching signal to determine a boosting time for minimizing a reduction in foreign matter filtering performance of an electric dust collector while reducing noise generated in a charging part during charging .

It is still another object of the present invention to provide a high voltage generator and an air conditioner using voltage multipliers to reduce the overall external size of a transformer disposed for boosting a commercial power supply and stabilize operation.

The electric dust collecting apparatus according to the present embodiment includes a signal generator for generating a switching signal to be switched on or off based on a set duty ratio and a switch for switching the current based on the switching signal to convert the direct current voltage to a pulse voltage A timer for setting a time point at which the duty ratio is adjusted to increase the pulse voltage; a transformer for receiving the pulse voltage and increasing the pulse voltage according to the winding ratio; When the time point is reached, a control unit for adjusting the duty ratio is included.

The control unit increases the duty ratio for a set boost time to increase the magnitude of the voltage output by the transformer.

The switching signal includes a first PWM signal and a second PWM signal.

The second PWM signal is repeatedly turned on or off during a period in which the first PWM signal is turned on.

And a boosting capacitor disposed at an output side of the signal generator and having a charge or discharge time determined according to a duty ratio of the second PWM signal.

The step-up capacitor charges the charge flowing in the period in which the second PWM signal is turned off.

The step-up capacitor performs discharging in a period in which the two PWM signals are on.

When the charge time of the step-up capacitor is longer than the discharge time, the charge charged in the step-up capacitor is transmitted to the transformer, and the transformer boosts the voltage of the received charge.

The switch unit includes a first switch unit that performs a switching operation based on the switching signal from the signal generating unit.

The switch unit further includes a second switch unit that performs a switching operation based on a signal output from the first switch unit.

The first switch unit and the second switch unit are alternately turned on or off so that the current flowing from the DC voltage unit is converted into a pulse voltage.

The first switch unit includes a BJT (Bipolar Junction Transistor).

The second switch unit includes a MOSFET (Metal-Oxide Semiconductor Field Effect Transistor).

And a first voltage distribution unit for operating the first switch unit in a switching mode.

The first voltage divider is connected to an output terminal of the DC voltage unit and inputs a DC voltage output from the DC voltage unit to the first switch unit.

And a second voltage distributor for operating the second switch in a switching mode.

The second voltage divider is connected to an output terminal of the DC voltage unit and inputs a DC voltage output from the DC voltage unit to the second switching unit.

And a voltage multiplier disposed at an output side of the transformer for multiplying a voltage output from the transformer by a predetermined multiple.

In order to prevent damage to the circuit from transient overvoltage, a safety circuit part disposed on the input side of the transformer is further included.

The safety circuit includes a protection diode whose cathode side is disposed on the input side of the transformer and the cathode side is grounded.

The protection diode includes a TVS diode (Transient Voltage Suppression Diode).

A protection resistor is disposed on the input side of the transformer and on the cathode side of the protection diode to reduce the magnitude of the overvoltage input to the protection diode.

And a surge protection unit disposed on an output side of the transformer to prevent a surge voltage.

The surge protector includes at least one resistor.

The air conditioner of this embodiment includes a casing having a suction portion and a discharge portion, a casing provided with a blowing fan, and an electrostatic precipitator disposed in the suction portion, for filtering the foreign matter in the air using the electrostatic separation action.

The electric dust collector includes a high voltage generator for boosting a voltage input from the casing to generate a high voltage; And a filter member including a charging unit that charges the dust in the air by receiving a high voltage generated from the high voltage generator, and a dust collecting unit connected to the ground and collecting the charged dust.

And the noise generated in the electric dust collector is formed to be lower than the noise of the blowing fan by adjusting a boosting time for the voltage input from the casing to reach the high voltage.

According to the control method of the high voltage generator, the air conditioner, and the air conditioner according to the present embodiment, the voltage rising time of the voltage for reaching the high voltage to be applied to the charging part is delayed, thereby reducing the air insulation breakdown phenomenon. Thus, the noise can be reduced and thus the customer satisfaction can be improved.

Further, by adjusting the duty ratio of the switching signal, it is possible to optimize the magnitude of the applied voltage or the boosting time to achieve the dust collecting efficiency expected by the user while reducing the noise.

Further, since the multiplier is disposed at the output side of the transformer, the step-up ratio of the transformer can be lowered. Therefore, the overall external size of the transformer can be reduced, and the stable high voltage can be output by improving the stability.

1 is a perspective view of a ceiling type air conditioner according to an embodiment of the present invention.
2 is an exploded perspective view of a ceiling-type air conditioner according to an embodiment.
3 is a rear perspective view of the electric dust collector according to the embodiment.
4 is an exploded perspective view of the electric dust collector according to the embodiment.
5 is a cross-sectional view taken along line VV 'of FIG. 3, according to an embodiment.
6 is a circuit diagram of an input power source device according to an embodiment.
7 is a flowchart illustrating a method of controlling an air conditioner according to an embodiment of the present invention.
8 is a graph showing the output voltage versus the set boost time according to the embodiment.
FIG. 9 is a graph comparing magnitudes of noises generated according to different boosting time settings according to the embodiment.
10 is a graph comparing the magnitude of noise generated during the boosting time of the embodiment and the prior art.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

FIG. 1 is a perspective view of a ceiling-mounted air conditioner according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a ceiling-mounted air conditioner according to an embodiment.

Referring to FIGS. 1 and 2, the ceiling-type air conditioner 1 according to the embodiment of the present invention includes a casing 20 fixed to a ceiling and sucking outside air and discharging heat-exchanged air.

The casing (20) may include a ceiling fixing member (201) for fixing the casing (20) to the ceiling. In order for the casing 20 to be in close contact with the upper side of the ceiling, the ceiling fixing member 201 may be fixed to the ceiling by means of a fastening member such as a bolt (not shown).

A plurality of parts can be disposed in the inner space of the casing 20. [ The plurality of components may include a heat exchanger (not shown) for exchanging heat with the air sucked from the outside, and a blower fan (not shown) for discharging the heat-exchanged air to the outside.

The air conditioner (1) may further include a front panel (10) which can be coupled to the lower side of the casing (20). When the casing 20 is embedded in a ceiling by a ceiling embedding member such as a gypsum board, the front panel 10 may be positioned at a substantially ceiling height and exposed to the outside. The overall appearance of the air conditioner (1) can be formed by the casing (20) and the front panel (10).

The front panel 10 may include a suction unit 103 for sucking room air and a discharge unit 101 for discharging the air heat exchanged in the air conditioner 1 to the room.

The front panel 10 may further include a suction grill 104 for preventing foreign substances contained in the air sucked through the suction unit 103 from being introduced. The suction grill 104 may be detachably coupled to the suction unit 103.

The suction unit 103 may be formed to be long in the front portion of the front panel 10 and the discharge unit 101 may be formed to be long in the rear portion of the front panel 10 in the lateral direction.

The front panel 10 may further include a discharge vane 102 provided movably on one side of the discharge unit 101. The discharge vane 102 can control the amount or direction of air discharged through the discharge portion 101. For example, the discharge vane 102 may be rotatable about the hinge axis (not shown) provided at both ends of the discharge vane 102.

In summary, in the air conditioner 1, when the blowing fan is driven, the air in the indoor space can be sucked into the casing 20 through the suction portion 103. The air sucked into the casing 20 can be heat-exchanged in the heat exchanger. The air passing through the heat exchanger can be discharged to the indoor space through the discharge portion 101 of the front panel 10 by the blowing fan.

The casing 20 may include a suction hole 203 formed to communicate with a suction portion 103 formed on the front surface of the front panel 10. The air conditioner (1) may include an electric dust collector (30) disposed in the suction hole (203). The electric dust collector 30 can charge foreign matters such as dust contained in the air introduced into the air conditioner 1 and collect the charged foreign objects. Accordingly, the electric dust collector 30 can filter foreign substances in the air sucked into the indoor unit.

FIG. 3 is a rear perspective view of the electrostatic precipitator according to the embodiment, FIG. 4 is an exploded perspective view of the electrostatic precipitator, and FIG. 5 is a sectional view taken along line V-V of FIG.

2 to 5, the electric dust collector 30 includes a filter housing 500 installed in the casing 20, a filter housing 500 detachably coupled to the filter housing 500, A filter assembly 300 and a high voltage generator 700 that supplies power to the filter assembly 300.

The filter assembly 300 includes an upper frame 310a facing upward and a pair of side frames 310b extending downward from the upper frame 310a on both sides of the upper frame 310a. 310b and a lower frame 310c disposed at a lower end of the pair of side frames 310b. The filter frame 300 of the filter assembly 300 may be formed by coupling the upper frame 310a, the pair of side frames 310b, and the lower frame 310c. The filter rim may form an outer appearance of the filter assembly 300.

The filter assembly 300 may include an upper locking protrusion 320 to be coupled to the filter housing 500. The upper locking protrusion 320 may be disposed on the upper frame 310a. In addition, the upper latch protrusion 320 may protrude upward from the upper frame 310a.

The filter assembly 300 may include an upper locking protrusion 330 to be coupled to the filter housing 500. The upper locking protrusion 330 may be disposed on the lower frame 310c. In addition, the upper locking protrusion 330 may protrude downward from the lower frame 310c.

The filter assembly 300 may further include a guide groove 350 to be slidably coupled to the filter housing 500. The guide groove 350 may be disposed in the lower frame 310c. In addition, the guide groove 350 may be a recess formed upward in the lower frame 310c.

Meanwhile, a hole (not shown) for inserting a fastening member such as a bolt may be formed in the guide groove 350.

The filter assembly 300 may further include a first electrode 591 connected to the high voltage generator 700 and a second electrode 592 connected to the ground. The first electrode 591 may be disposed close to one of the pair of side frames 310b. In addition, the second electrode 592 may be disposed closer to the other one of the upper and lower frames 310b.

In detail, the first electrode 591 may be connected to the high voltage generator 700 when the filter assembly 300 is mounted on the filter housing 500. Therefore, a high voltage may be applied to the first electrode 591 from the high voltage generator 700. The high voltage may be, for example, -7.5 [kV]. When the filter assembly 300 is mounted on the filter housing 500, the second electrode 592 may be connected to the ground.

The filter assembly 300 may include a filter member 380 for filtering dust in the air sucked into the indoor unit 1. The filter member 380 may include a charging portion 380a for charging foreign matters in the air and a dust collecting portion 380b for collecting charged foreign matters. The plurality of charging units 380a and the plurality of collecting units 380b may be provided. The plurality of charging units 380a and the plurality of dust collecting units 380b may be alternately arranged in the vertical direction and may be spaced apart from each other. The charging unit 380a may be connected to the first electrode 591. [ The dust collecting part 380b may be connected to the second electrode 592. When a high voltage is applied to the charging unit 380a, an electric field may be formed between the charging unit 380a and the dust collecting unit 380b. A corona discharge may be formed between the charging part 380a and the dust collecting part 380b. The dust particles charged by the corona discharge can be collected in the dust collecting section 380b.

The filter assembly 300 may include a gripping portion 360 that can be gripped to separate the filter assembly 300 from the filter housing 500. The grip portion 360 may protrude in one direction from the filter rim portion. The grip portion 360 may be provided at a position spaced apart from the insertion hole 340 by a predetermined distance. For example, the grip portion 360 may be disposed close to the filter lower frame 310c. Accordingly, in a state where the indoor unit is installed on the ceiling, the user can easily separate the filter assembly 500 from the filter housing 500 while pulling the filter assembly 300 in a direction in which the insertion protrusion 570 protrudes.

The filter housing 500 is provided with a housing upper frame 510a that faces upward and a pair of housings that are provided on both sides of the housing upper frame 510a and extend downward from the housing upper frame 510a, A frame 510b and a housing lower frame 510c disposed at the lower ends of the pair of the housing lateral frames 510b. Housing edges of the filter housing 500 may be formed by coupling the housing upper frame 510a, the pair of housing lateral frames 510b, and the housing lower frame 510c. The housing rim may form an outer appearance of the filter housing 500.

The filter housing 400 may include housing coupling holes 520 and 530 to be fixed to the casing 20. The housing fastening holes 520 and 530 are formed with first housing fastening holes 520 disposed on both sides of the filter housing 500 and second housing fastening holes 530 disposed below the filter housing 400, May be included. In detail, the first housing coupling groove 520 may be formed in the housing lateral frame 510b. Also, the second housing coupling groove 530 may be formed in the housing lower frame 510c. Casing fastening holes (not shown) corresponding to the housing fastening holes 520 and 530 may be formed in the casing 20. Therefore, the filter housing 500 can be coupled to the casing 20, for example, by fastening members such as bolts inserted into the housing fastening holes 520 and 530 and the casing fastening holes.

The filter housing 500 may further include an upper latching hole 540 to which the upper latching protrusion 320 of the filter assembly 300 can be coupled. The upper latching hole 540 may be formed in the housing upper frame 510a of the filter housing 500. [ The filter housing 500 may further include a lower latching hole 550 to be coupled to the filter assembly 300. The lower latching hole 550 may be formed in the housing lower frame 510c.

The filter housing 500 may further include guide protrusions 580 for guiding the filter assembly 300 to be coupled to the filter housing 500. The guide protrusion 580 may protrude upward from the housing lower frame 510c. The guide protrusion 580 may protrude in a size corresponding to the guide groove 350 to be coupled to the guide groove 350 of the filter assembly 300.

Meanwhile, a concave groove 580a may be formed on the inner side of the guide protrusion 580. In the groove 580a, holes (not shown) into which fastening members 593 and 594 such as bolts can be inserted can be formed. Therefore, the fastening members 593 and 594 can be inserted into the holes formed in the guide groove 350 and the guide protrusion 580, respectively, thereby fixing the filter housing 500 to the filter assembly 300.

The fastening members 593 and 594 may include a first fastening member 593 for fastening the filter assembly 300 and the first electrode 591 of the filter housing 500. One end of the first fastening member 593 is in contact with the first electrode 591 when the first fastening member 593 is inserted into the hole formed in the guide groove 350 and the guide protrusion 580, . A terminal 714 is coupled to the first coupling member 593 and a cable 713 connected to an output terminal of the high voltage generator 700 is connected to the terminal terminal 714 have. Accordingly, a high voltage output from the high voltage generator 700 may be applied to the first electrode 591.

The coupling members 593 and 594 may further include a second coupling member 594 for fixing the filter assembly 300 and the second electrode 592 of the filter housing 500. When the second fastening member 594 is inserted into the hole formed in the guide groove 350 and the guide protrusion 580, one end of the second fastening member 594 is connected to the second electrode 592 side Can be contacted.

The first and second fastening members 593 and 594 may be formed as a conductor, for example.

The filter housing 500 may further include an insertion protrusion 570 inserted into the insertion hole 340 of the filter assembly 300. By inserting the insertion hole 340 by the insertion protrusion 570, the user can accurately and easily mount the filter assembly 300 to the filter housing 500.

The filter housing 500 may further include a mounting space 600 through which the high voltage generator 700 may be disposed.

The filter housing 500 may include support portions 610 and 620 for supporting the high voltage generator 700. The support portions 610 and 620 may protrude in a direction in which air is discharged from the filter housing 500.

The supporting portions 610 and 620 include a pair of first supporting portions 610 for supporting both sides of the high voltage generator 700 and a second supporting portion 620 for supporting the lower portion of the high voltage generator 700 . The mounting space 600 may be formed by the first supporting portion 610 and the second supporting portion 620. For example, the high voltage generator 700 may have a rectangular parallelepiped shape. The distance between the pair of first supporting portions 610 may be formed to correspond to the length of the high voltage generator 700. The length of the first support portion 610 and the second support portion 620 protruded may correspond to the width of the high voltage generator 700. A hook 611 may be formed at one end of the first support portion 610. On the other hand, a pair of fixing protrusions 711 protruding on both sides may be disposed on both sides of the high voltage generator 700. When the high voltage generator 700 is mounted in the mounting space 600, the fixing protrusion 711 may slide along the first supporting portion 610. One end of the fixing protrusion 711 may be fixed by the hook 611. [ Therefore, the high voltage generator 700 can be stably installed in the mounting space 600. [

The high voltage generator 700 includes a main body 710 in which a space for accommodating components can be formed therein, a cover 720 coupled to the main body 710 so as to open and close the space, An input power supply 800 may be included. The input power supply 800 may be supplied with commercial power from the indoor unit 1. The input power supply unit 800 may generate a high voltage for applying power to the charging unit 380a of the filter assembly 300 by boosting the commercial power supply. At this time, the high voltage may be determined by the setting of the user. The boosting time at which the commercial power supply is boosted to reach the set high voltage may be determined by a user's setting.

For example, when the set high voltage is -7.5 [kv] and the set voltage rising time is 100 seconds, the input power source 800 applies the voltage applied to the charging unit 380a to the initial output voltage Can be sequentially increased from 0 [v] to -7.5 [kv]. The output voltage sequentially increased and output from the input power supply unit may be applied to the charging unit 380a. Therefore, the insulation breakdown phenomenon of the air can be reduced, and the noise generated thereby is advantageously reduced.

Hereinafter, the input power supply device provided in the high voltage generator will be described.

6 is a circuit diagram of an input power source device according to an embodiment.

The input power supply apparatus 800 may include a DC voltage unit 810 that outputs a DC voltage. The DC voltage unit 810 may rectify the commercial power supplied from the indoor unit 1 to a DC voltage. For example, when an AC voltage of 220V is input from the indoor unit 1 to the DC voltage unit 810, the DC voltage unit 810 rectifies the input AC voltage 220V and outputs the AC voltage of 12V at a DC voltage of 12V .

The input power supply 800 may further include a transformer 830 for boosting an input voltage. The transformer 830 may include a first input terminal 831 to which a DC voltage is applied and a second input terminal 832 to be connected to a switching signal generating unit 820, . The transformer 830 may further include a first output terminal 833 and a second output terminal 834 for outputting the boosted voltage. A pulse voltage may be applied to the input terminals 831 and 832 of the transformer 830 by the switching signal generator 820.

The transformer 830 boosts the pulse voltage input from the primary side of the transformer 830 to the secondary side of the transformer 830 according to the number of turns of the coil, that is, the winding ratio. The primary side may refer to the input side of the transformer 830 and the secondary side may refer to the output side where the voltage boosted by the transformer 830 is output. For example, when the winding ratio is 1: 116, the voltage input to the primary side of the transformer 830 may be increased by 116 times and output to the secondary side of the transformer 830.

The input power supply apparatus 800 may further include a switching signal generator 820 for generating a switching signal and switching the DC voltage output from the DC voltage unit 810 to convert the DC voltage into a pulse voltage. The DC voltage may be converted into a pulse voltage by the switching signal generated by the switching signal generator 820. The pulse voltage may be induced to a high voltage according to the winding ratio of the transformer 830.

The switching signal generator 820 may include a signal generator 821a for generating a switching signal. The switching signal may include a first PWM signal and a second PWM signal. The first PMW signal may be greater than one period of the second PWM signal. Also, the second PWM signal may be output in a period in which the current of the first PWM signal flows. Conversely, a signal may not be output from the output terminal of the signal generator 821a during a period in which the current of the first PWM signal does not flow. The period and the duty ratio of the first PWM signal and the second PWM signal may be set to be different from each other.

In this embodiment, the section in which the current flows in the first and second PWM signals is on, and the section in which the currents of the first and second PWM signals do not flow is turned off.

The switching signal generator 820 may further include a timer 821b for setting a time point at which the duty ratio of the switching signal is adjusted. In detail, in order to increase the pulse voltage, the timer 821b may set a time to adjust the duty ratio. The timer 821b can set a time point at which the duty ratios of the first and second PWM signals are varied. For example, the timer 821b may set a time point when a switching signal is generated to a first time point, and may set a time point after a predetermined time from the first time point to a second time point. The controller may set the duty ratio of the first PWM signal to 1% at the first time point and set the duty ratio of the first PWM signal to 2% at the second time point.

The switching signal generator 820 may include a controller 822 for controlling the signal generator 821a and the timer 821b. The controller 822 controls the signal generator 821a and the timer 821b to generate the set high voltage so that the duty ratio of the first and second PWM signals and the duty ratio of the first and second PWM signals are varied Can be set. In detail, the controller 822 can adjust the duty ratio when a time set by the timer 821b is reached. The controller 822 may increase the duty ratio to increase the magnitude of the voltage output by the transformer during the set voltage rise time.

The switching signal generating unit 820 includes a switch unit for switching a current based on a switching signal output from the signal generating unit 821a and converting the DC voltage output from the DC voltage unit 810 into a pulse voltage 823, and 824 may be further included.

The switch units 823 and 824 may include a first switch unit 823 and a second switch unit 824 which are turned on or off according to a PWM signal input from the signal generating unit 821a. For example, the first switch unit 823 may include a bipolar junction transistor (BJT), and the second switch unit 824 may include a metal-oxide semiconductor field effect transistor (MOSFET).

The base B of the first switch unit 823 may be connected to the output of the signal generator and to the output of the first voltage divider 825, which will be described later. The emitter E of the first switch portion 823 may be grounded. The collector C of the first switch unit 823 may be connected to the input side of the second switch unit 824, which will be described later, as an output terminal through which signals are output.

The first switch unit 823 can output an input signal to the collector C when a signal is input to the base B. [ For example, the first switch unit 823 may operate during a period in which the boost signal is on. Conversely, the first switch unit 823 may not operate during a period in which the switching signal is off. Specifically, the first switch unit 823 can be turned on or off by a second PWM signal that is turned on or off in a period in which the first PWM signal is turned on. When the first switch unit 823 is turned on, the signal output from the first switch unit 823 may be input to the second switch unit 824.

The gate G of the second switch unit 824 is connected to the collector of the first switch unit 823 and the output side of the second voltage distributor 826 Can be connected. Further, the emitter E of the second switch portion 824 may be grounded. The drain D of the second switch unit 824 may be connected to the transformer 830 side. The second switch portion 824 can be turned on when 0 [V] is applied to the gate G. [ That is, when no signal is input from the first switch unit 823, the second switch unit 824 can be turned on.

Conversely, when the voltage between the gate (G) and the source (S) is larger than 0 [V], it can be turned off. Accordingly, when a signal having passed through the first switch unit 823 is input to the second switch unit 824, the second switch unit 824 can be turned off.

In summary, the first switch unit 823 and the second switch unit 824 can be turned on or off alternately by the switching signal.

The switching signal generating unit 820 may further include voltage dividing units 825 and 826 arranged to operate the first switch unit 823 and the second switch unit 824 in a switching mode.

The voltage distributor 825 and 826 are connected to a first voltage distributor 825 disposed between the output terminal of the signal generator 821a, the output terminal of the direct current voltage generator 810 and the input terminal of the first switch 823, ) May be included. More than two distribution resistors may be disposed in the first voltage divider 825. For example, the first voltage divider 825 may include a first distribution resistor 825a and a second distribution resistor 825b. The first distribution resistor 825a and the second distribution resistor 825b can distribute the DC voltage input from the DC voltage unit 810 to the first voltage distribution unit 825. [

Accordingly, the first voltage distributor 825 can distribute the voltage output from the DC voltage unit 810 and supply the power for operating the first switch unit 823 in the switching mode.

The voltage distributed from the first voltage distributor 825 may be supplied to the base B of the first switch unit 823. [

Accordingly, the first switch unit 823 can be turned on at a time when current flows during one cycle of the switching signal. At this time, the signal passing through the first switch unit 823 may be input to the second switch unit 824.

The voltage division parts 825 and 826 are connected to the output terminal of the first switch part 823, the output terminal of the direct current voltage part 810 and the input terminal of the second switch part 824, A distribution portion 826 may be further included. More than two distribution resistors may be disposed in the second voltage divider 826. For example, the second voltage divider 825, 826 may include a third multiplier resistor 826a and a fourth divider resistor 826b. The DC voltage input from the DC voltage unit 810 to the second voltage distributor 826 can be distributed by the third bias resistor 826a and the fourth distribution resistor 826b. Accordingly, the second voltage distributor 826 can distribute the voltage output from the DC voltage unit 810 and supply the power for turning on the second switch unit 824. The voltage distributed from the second voltage distributor 826 may be supplied to the gate G of the second switch unit 824.

The second voltage divider 826 may further include a step-up capacitor 827. The boosting capacitor 827 can be charged with a constant voltage, so that a sufficient current can be supplied to the second switch unit 824.

In the switching signal generator 820, The boosting capacitor 827 may be further charged and discharged as the switch units 823 and 824 are turned on or off. The booster capacitor 827 may have one end connected to the drain D of the second switch unit 824 and the input side of the transformer 830. The other end of the booster capacitor 827 may be grounded.

When the first switch unit 823 is turned on by the switching signal, the second switch unit 824 may be turned off. A current passing through the transformer 830 flows into the step-up capacitor 827, so that the step-up capacitor 827 can be charged with a voltage. Conversely, when the first switch portion 823 is turned off by the switching signal, the second switch portion 824 can be turned on. And the step-up capacitor 827 may be discharged. The second switch unit 824 can charge and discharge the booster capacitor 827 by a second PWM signal that is turned on or off in a period in which the first PWM signal is turned on. The charging time and discharging time of the step-up capacitor 827 may be determined by the duty ratio of the second PWM signal, respectively. When the charging time of the step-up capacitor 827 is longer than the discharging time, the voltage stored in the step-up capacitor 827 can be boosted by the transformer 830.

For example, when one period of the second PWM signal is 35 [us] and the duty ratio of the second PMW signal is 74%, the boosting capacitor 827 outputs [26] us during one period of the second PWM signal Can be charged, and can be discharged for 9us. Since the charging time of the step-up capacitor 827 is greater than the discharging time, the voltage charged in the step-up capacitor 827 can be transferred to the transformer 830 and boosted. The constant voltage may be boosted during one cycle of the second PWM.

On the other hand, as described above, the interval in which the second PWM signal is turned on can be determined by the duty ratio of the first PWM signal. In the period in which the first PWM is on, the voltage can be boosted by the on or off operation of the second PWM signal. That is, the ON period of the first PWM signal may be a period during which the voltage is stepped up, and the magnitude of the voltage stepped up by the stepped up period may be determined. For example, a DC voltage of 12V is applied to the primary side of the transformer 830, one cycle of the first PWM signal is 10 [ms], and the duty ratio of the first PWM signal is 13.7%. As described above, the period of the second PWM signal may be 35 [mu], and the duty ratio of the second PMW signal may be 74%. The second PWM signal may be arranged in the interval of turning on the first PWM signal. That is, the step-up can be performed 40 times by the duty ratio of the second PWM signal. Since the period during which the first PWM signal is turned on is 1.37 [msec] due to the duty ratio of the first PWM signal, the primary side voltage of the transformer 830 is maintained at about -2.5 [kV] for 1.37 [msec] And can be stepped up and output to the secondary side of the transformer 830.

In summary, the controller 822 controls the duty ratio of the first PWM signal and the duty ratio of the second PWM signal generated by the signal generator 821a, Can be adjusted. Also, the controller 822 may control the duty ratio of the first PWM signal to gradually increase or decrease by using the timer 821b.

When the control unit 822 gradually decreases the duty ratio of the first PWM signal, the period during which the voltage is stepped up by the ON or OFF operation of the second PWM signal can be reduced. At this time, the magnitude of the voltage input to the transformer 830 can be reduced, so that the magnitude of the voltage boosted by the transformer 830 can be reduced.

In contrast, when the controller 822 gradually increases the duty ratio of the first PMW signal, the period during which the voltage is stepped up by the on or off operation of the second PWM signal may increase. At this time, the magnitude of the voltage input to the transformer 830 can be increased, so that the magnitude of the voltage boosted by the transformer 830 can be increased.

Accordingly, the controller 822 controls the timer 821b and the signal generator 821a to gradually increase the magnitude of the first PWM signal, thereby increasing the magnitude of the first PWM signal to the charging unit 380a of the indoor unit 1 The voltage rising time of the voltage reaching the high voltage to be applied can be delayed. By delaying the voltage rising time of the voltage reaching the high voltage, the dielectric breakdown phenomenon of the air on the dust collecting portion 380b side can be reduced. Therefore, there is an advantage that the noise generated by the insulation breakdown phenomenon of the air is reduced.

The switching signal generator 820 may further include a safety circuit 828 for preventing damage to the input power source device from an overvoltage generated temporarily. The safety circuit part 828 may include a protection diode 828a and a protection resistor 828b for reducing a voltage applied to the protection diode 828a. The protection resistor 828b may reduce the magnitude of the voltage applied to the protection diode 828a. Accordingly, the protection diode 828a operates within the limit voltage, thereby improving the durability of the protection diode 828a.

The protection diode 828a may include, for example, a TVS diode (Transient Voltage Suppression Diode). When an overvoltage is generated in the input power supply device 800, the protection diode 828a may be switched from a high impedance to a low impedance so as to bypass the overvoltage. After the overvoltage is bypassed, the protection diode 828a can be automatically switched to a high impedance. Therefore, if the high voltage temporarily flows through the input power supply device 800 due to external factors such as lightning or static electricity, the damage to the input power supply device 800 can be prevented by the safety circuit portion 828 .

The input power supply 800 may further include a voltage multiplier 840 for multiplying a voltage output from the transformer 830. The multiplier 840 is disposed on the output side of the transformer 830 and can multiply the voltage output from the transformer 830 by a predetermined multiple. Accordingly, the total external size of the transformer 830 can be reduced, and the high voltage generator 700 can be made compact. That is, since the high voltage generator 700 can be manufactured in a small size, it can be mounted in a small size air conditioner.

In addition, the step-up ratio of the transformer 830 can be lowered, so that the insulation requirement according to the step-up ratio can be reduced. Therefore, a stable high voltage can be generated from the high voltage generator 700.

The multiplier 840 may be connected to a first output terminal 833 and a second output terminal 834 of the transformer 830.

The multiplier 840 may include a first multiplying capacitor 841 having one end connected to the second output end 834 and the other end connected to the first node N1. The current output from the transformer 830 may be input to the first multiplying capacitor 841. Accordingly, the first multiplying capacitor 841 can be charged with electric charges.

The multiplier 840 may further include a first multiplication diode 842 having an anode connected to the first node N1 and a cathode connected to the second node N2. And the second node N2 may be connected to the first output terminal 833. [ The charges charged in the first multiplying capacitor 841 can pass through the first multiplying diode 842.

The multiplier 840 may further include a second multiplying capacitor 843 having one end connected to the second node N2 and the other end connected to the third node N3. The current passed through the first multiplication diode 842 may be input to the second multiplication capacitor 843. Accordingly, the second multiplication capacitor 843 can be charged with electric charge. That is, the second multiplication capacitor 843 may be charged with the same amount of charge as that of the first multiplication capacitor 841. On the other hand, a current flows from the transformer 830 to the first multiplying capacitor 841, and the electric charge can be charged.

The multiplier 840 includes a second multiplication diode 844 having an anode side connected to the third node N3 and a cathode side connected to a fourth node N4 and a second multiplication diode 844 connected to the fifth node N5 And a third multiplication diode 846 connected to the fourth node on the cathode side. The current output from the second multiplying capacitor 843 may pass through the second multiplying diode 844. Meanwhile, current is also output from the first multiplying capacitor 841, and the output current can pass through the second multiplying diode 844.

The multiplier 840 may further include a third multiplying capacitor 845 having one end connected to the fourth node N4 and the other end connected to the fifth node N5. The charges discharged from the second multiplication capacitor 843 may pass through the second multiplication diode 844 and move to the third multiplication capacitor 845. That is, the third multiplication capacitor 845 may be charged with the same amount of charge as that charged in the second multiplication capacitor 843. A current flows from the transformer 830 to the first multiplying capacitor 841 to charge the first multiplying capacitor 841. And the second multiplication capacitor 843 may be charged by the charge transferred from the first multiplication capacitor 841. [ Therefore, the output voltage of the multiplier 840 is the sum of the voltages of the first and second multiplication capacitors 841, 845, and can be multiplied by three with respect to the voltage input from the transformer 830.

The input power supply 800 may further include a surge protection unit 850 for preventing a surge voltage and an output electrode 860 disposed on an output side of the surge protection unit 850 to output a high voltage. The surge protector 850 may include at least one resistor, for example. The surge protector 850 may be disposed on the output side of the multiplier 840. Alternatively, the surge protection unit 850 may be disposed on the output side of the transformer 830.

The output electrode 860 may be disposed at the output terminal of the surge protection unit 850. That is, the surge protection unit 850 may limit the current output from the output electrode 860. Therefore, even if the user's body touches the output electrode 860, the current output from the output electrode 860 is limited by the surge protection unit 850, thereby preventing the electrostatic discharge. Accordingly, there is an advantage that the safety for the high voltage generator 700 can be provided to the user. The charging unit 380a of the filter assembly 300 may be connected to the output electrode 860. [ Therefore, a high voltage output from the high voltage generator 700 may be applied to the charging unit 380a.

Hereinafter, a process of applying a high voltage generated from the high voltage generator to the charging unit 380a of the filter assembly 300 in the air conditioner will be described.

FIG. 7 is a flowchart illustrating a method of controlling a high voltage generator of an air conditioner according to an embodiment of the present invention, and FIG. 8 is a graph schematically illustrating an output voltage output from a high voltage generator with respect to a set voltage rising time according to an embodiment.

Referring to FIG. 7, the indoor unit 1 can be operated (S1).

The control unit 822 may receive information that the filter assembly 300 is mounted on the filter housing 500 (S3).

The control unit 822 may receive a preset high voltage level and a boosting time to be applied to the charging unit of the filter assembly 300 (S5). For example, the magnitude of the set high voltage is -7.5 [kV], and the set voltage rising time may be 100 [sec]. Accordingly, the controller 822 can increase the voltage input to the high voltage generator 700 to -7.5 [kV] for 100 [sec].

The controller 822 can check the duty ratios of the first PWM signal and the second PWM signal generated by the signal generator 821a to reach the predetermined high voltage at step S7. For example, when the duty ratio of the second PWM signal is 74%, the duty ratio of the first PWM signal for boosting the voltage input to the high voltage generator 700 to -7.5 [kV] may be 12%.

The controller 822 may control the duty ratio of the first PWM signal to gradually increase during the set boost time (S9). The controller 822 can set a rate at which the duty ratio of the first PWM signal is increased at a predetermined time interval through the timer 821b for the set step-up time. 8, when the duty ratio of the first PWM signal to the set high voltage is 12% and the set voltage rising time is 100 [sec], the controller 822 outputs the first PWM signal for 1 second The duty ratio can be controlled to increase by 0.12%. Accordingly, the duty ratio of the first PWM signal is gradually increased from 0.12% to 0.2 [sec] to 0.2 [sec], to 0.36% to 3 [sec] %. ≪ / RTI > Therefore, the high voltage set at the set voltage rising time can be output to the output electrode 860. [

The voltage rising time of the voltage for reaching the high voltage to be applied to the charging portion 380a is delayed, so that the phenomenon that the insulation of the air is destroyed can be reduced. Therefore, the noise generated when the high voltage is applied can be reduced.

7, when the voltage output to the output electrode 860 reaches the predetermined high voltage, the controller 822 may control to maintain the duty ratio of the first PWM signal (S11 ).

FIG. 9 is a graph showing the output voltage versus the set boost time according to the embodiment, and FIG. 10 is a graph comparing the magnitude of the noise generated during the boosting time of the embodiment and the prior art.

Referring to FIG. 9, the boosting time of the high voltage generator can be set with reference to the noise generated in the air conditioner. The noise generated in the air conditioner may be caused by various causes such as noise generated in a power source device (not shown) for driving the air conditioner and noise generated by rotation of the vane. However, the noise generated from the air conditioner may occupy the largest part of the noise generated from the blowing fan. Therefore, the boosting time of the high voltage generator can be set based on the noise generated from the blowing fan.

That is, the noise generated by the high voltage generator can be smaller than the noise of the blower fan, so that the user can feel no noise generated by the high voltage generator, and the user can quickly achieve the expected dust collection efficiency There are advantages to be able to.

For example, a weak wind, a weak wind, a paralytic wind, and a strong wind mode may be provided in the blower fan of the air conditioner in proportion to the rotational force of the blower fan. In the weak wind mode, about 30 [dB], in the case of the weak wind mode, about 36 [dB], in the case of the neutral wind mode, about 41 [dB] . When the magnitude of the noise generated in the weak wind mode is determined to be a sound that does not interfere with concentration at the time of sleep or during work, the boosting time of the high voltage generator may be set to 100 [sec] according to the illustrated graph .

Referring to FIG. 10, the noise level of the high voltage generator according to the present embodiment can be compared with the noise level of the conventional high voltage generator. The graph of the prior art shows a case where the boosting time of the high voltage generator is close to zero, that is, when a high voltage is applied at a time. The graph of this embodiment shows a case where the boosting time of the high voltage generator is 100 [sec]. In the case of the prior art, the largest noise level is about 44 [dB], whereas in this embodiment, the largest noise level is about 34 [dB]. Therefore, according to the present embodiment, it can be seen that the noise of about 10 [dB] is reduced as compared with the conventional art.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the above teachings. will be.

1: indoor unit 101:
103: Suction section 20: Casing
30: electric dust collector 300: filter assembly
380: Filter member 380a:
380b: a dust collecting part 591: a first electrode
592: second electrode 593: first fastening member
594: second fastening member 700: high voltage generator
710: Body 720: Cover
800: input power supply unit 810: DC voltage unit
820: Switching signal generator 821a: Signal generator
821b: timer 822:
823: first switch unit 824: second switch unit
825: first distribution voltage section 826: second distribution voltage section
827: step-up capacitor 828: safety circuit
830: Transformer 840: Multiplier
850: surge protection unit 860: output electrode

Claims (19)

A DC voltage unit for outputting a DC voltage;
A signal generator for generating a switching signal to be switched on or off based on the duty ratio set;
A switch unit for switching the current based on the switching signal to convert the DC voltage into a pulse voltage;
A timer for setting a time point for adjusting the duty ratio to increase the pulse voltage;
A transformer receiving the pulse voltage and increasing the pulse voltage according to the winding ratio; And
And a controller for adjusting the duty ratio when a time point set by the timer is reached,
Wherein,
And increases the duty ratio during the set boost time to increase the magnitude of the voltage output by the transformer. The method according to claim 1,
The switching signal comprising a first PWM signal and a second PWM signal;
And the second PWM signal is repeatedly turned on or off during a period in which the first PWM signal is turned on. 3. The method of claim 2,
And a boosting capacitor disposed at an output side of the signal generator and having a charge or discharge time determined according to a duty ratio of the second PWM signal. The method of claim 3,
Wherein the step-up capacitor charges the charge flowing in a period in which the second PWM signal is turned off, and discharges in a period in which the second PWM signal is turned on. 5. The method of claim 4,
When the charge time of the booster capacitor is longer than the discharge time,
Wherein the charge charged in the step-up capacitor is transmitted to the transformer, and the transformer boosts the voltage of the received charge. The method according to claim 1,
Wherein,
A first switch unit for performing a switching operation based on a switching signal from the signal generating unit; And
Further comprising a second switch unit for performing a switching operation based on a signal output from the first switch unit,
Wherein the first switch unit and the second switch unit alternately turn on or off to convert a current flowing from the DC voltage unit into a pulse voltage. The method according to claim 6,
Wherein the first switch unit includes a BJT (Bipolar Junction Transistor). The method according to claim 6,
Wherein the second switch unit includes a MOSFET (Metal-Oxide Semiconductor Field Effect Transistor). The method according to claim 6,
And a first voltage distributor for operating the first switch unit in a switching mode,
Wherein the first voltage divider comprises:
And a high voltage generator connected to an output terminal of the DC voltage unit, for inputting a DC voltage output from the DC voltage unit to the first switch unit. The method according to claim 6,
And a second voltage distributor for operating the second switch in a switching mode,
Wherein the second voltage divider comprises:
A high voltage generator connected to the output terminal of the direct current voltage unit and for inputting a direct current voltage outputted from the direct current voltage unit to the second switching unit. The method according to claim 1,
And a voltage multiplier disposed at an output side of the transformer for multiplying a voltage output from the transformer by a predetermined multiple. The method according to claim 1,
Further comprising a safety circuit portion disposed on an input side of the transformer to prevent damage to the circuit from transient overvoltage. 13. The method of claim 12,
Wherein the safety circuit includes a protection diode whose cathode side is disposed on an input side of the transformer and the anode side is grounded. 14. The method of claim 13,
Wherein the protection diode comprises a TVS diode (Transient Voltage Suppression Diode). 14. The method of claim 13,
Further comprising a protection resistor disposed at an input terminal of the transformer and at a cathode side of the protection diode, the protection resistor reducing the magnitude of the overvoltage input to the protection diode. The method according to claim 1,
And a surge protection unit disposed on an output side of the transformer to prevent a surge voltage. 17. The method of claim 16,
Wherein the surge protector includes at least one resistor. A casing having a suction portion and a discharge portion and provided with a blowing fan;
And an electrostatic precipitator disposed in the suction section for filtering the foreign matter in the air using the electrostatic separation action,
In the electric dust collector,
A high voltage generator according to claim 1 for boosting a voltage input from the casing to generate a high voltage; And
And a filter member connected to the ground and a dust collecting part for collecting the charged dust, the charging part being charged with the dust in the air by receiving the high voltage generated from the high voltage generator. 19. The method of claim 18,
And adjusts a boosting time for the voltage input from the casing to reach the high voltage so as to guide the noise generated by the electric dust collector to be lower than the noise of the blower fan.

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