KR20010008813A - Power factor control apparatus and method for inverter airconditioner - Google Patents

Power factor control apparatus and method for inverter airconditioner Download PDF

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Publication number
KR20010008813A
KR20010008813A KR1019990026830A KR19990026830A KR20010008813A KR 20010008813 A KR20010008813 A KR 20010008813A KR 1019990026830 A KR1019990026830 A KR 1019990026830A KR 19990026830 A KR19990026830 A KR 19990026830A KR 20010008813 A KR20010008813 A KR 20010008813A
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South Korea
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unit
power factor
power
link voltage
voltage
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KR1019990026830A
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Korean (ko)
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김학원
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구자홍
엘지전자 주식회사
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Priority to KR1019990026830A priority Critical patent/KR20010008813A/en
Publication of KR20010008813A publication Critical patent/KR20010008813A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/024—Compressor control by controlling the electric parameters, e.g. current or voltage

Abstract

PURPOSE: An apparatus and method for controlling power-factor of invertor type air conditioner are provided to improve the starting capability of a brushless direct current (BLDC) motor under low speed operation by controlling operation of a power-factor correction circuit in case that a direct current link voltage is detected to be an abnormal over voltage or an abnormal low voltage. CONSTITUTION: In an apparatus and method for controlling power-factor of invertor type air conditioner, the air conditioner includes a rectification unit(11) for rectifying a commercial alternate current power supply, an invertor unit(12) for receiving a rectified signal from the rectification unit(11) after smoothing the signal through a capacitor(C) for smoothing and then transforming it to a three-phase alternate current power supply, and a power-factor correction unit(15) arranged between the rectification unit(11) and the capacitor(C) for smoothing, which controls a power-factor of the rectified voltage of the rectification unit(11) in response to a power-factor control signal. The apparatus comprises a direct current link voltage detection unit(16) for detecting a direct current link voltage applied to the invertor unit(12) through the capacitor(C) for smoothing and then outputting it and a control unit(13) receiving the direct current link voltage detected at the direct current link voltage detection unit(16) and then outputting a power-factor control signal responsive to the voltage to the power-factor correction unit(15). Accordingly, since the direct current link voltage is not raised upon starting, duty ratio of a motor is relatively enlarged, so that a position of the motor is readily detected. Also, since both of a starting duty ratio and a variation part of a voltage of the power supply are compensated, the starting capability of the motor is improved.

Description

인버터 에어컨의 역률 제어장치 및 방법{POWER FACTOR CONTROL APPARATUS AND METHOD FOR INVERTER AIRCONDITIONER}Power factor control device and method of inverter air conditioner {POWER FACTOR CONTROL APPARATUS AND METHOD FOR INVERTER AIRCONDITIONER}

본 발명은 인버터 에어컨의 역률 제어장치 및 방법에 관한 것으로, 특히 직류링크전압이 이상과전압 또는 이상저전압으로 감지되면 역률개선회로의 동작을 억제시켜 저속 운전시 비엘디씨모터의 기동성을 향상시킬 수 있도록 한 인버터 에어컨의 역률제어장치및 방법에 관한 것이다.The present invention relates to a power factor control apparatus and method for an inverter air conditioner. In particular, when a DC link voltage is detected as an abnormal overvoltage or an abnormally low voltage, the operation of the power factor improving circuit is suppressed to improve the mobility of the BMC motor at low speed operation. A power factor control apparatus and method for an inverter air conditioner.

도1은 종래 인버터 에어컨의 역률제어장치에 대한 구성을 보인 블록도로서, 이에 도시된 바와같이 상용교류전원(AC)을 입력받아 이를 정류하는 정류부(11)와; 상기 정류부(11)의 정류신호를 평활용 커패시터(C)를 통해 평활하여 입력받아 구동신호에 의해 3상교류전원으로 변환하는 인버터부(12)와; 상기 인버터부(12)의 3상교류전원을 입력받아 그에 따라 구동되는 압축기용모터(M)와; 상기 압축기용모터(M)의 회전자의 위치를 검출하여 그에 따른 구동제어신호를 출력함과 아울러 압축기용모터(M)에 걸리는 부하량을 검출하여 그에 따른 역률제어신호를 출력하는 제어부(13)와; 상기 제어부(13)의 구동제어신호를 입력받아 그에 따른 구동신호를 상기 인버터부(12)에 인가하는 구동부(14)와; 상기 정류부(11)와 평활용커패시터(C) 사이에 위치하여, 상기 정류부(11)의 정류전압을 입력받아 이를 역률제어신호에 따라 역률을 조절하여 출력하는 역률개선부(15)로 구성되며, 이와같이 구성된 종래 장치의 동작을 설명한다.1 is a block diagram showing a configuration of a power factor control apparatus of a conventional inverter air conditioner, and as shown therein, a rectifier 11 for receiving a commercial AC power and rectifying it; An inverter unit 12 which smoothly receives the rectified signal of the rectifier 11 through a smoothing capacitor C and converts the rectified signal into a three-phase AC power by a drive signal; A compressor motor (M) which receives the three-phase AC power of the inverter unit 12 and is driven accordingly; A control unit 13 which detects the position of the rotor of the compressor motor M and outputs a driving control signal according thereto, and detects an amount of load applied to the compressor motor M and outputs a power factor control signal accordingly; ; A driving unit 14 receiving the driving control signal of the control unit 13 and applying the driving signal to the inverter unit 12 accordingly; Located between the rectifier 11 and the smoothing capacitor (C), and receives the rectified voltage of the rectifier 11 is composed of a power factor improving unit 15 for adjusting the power factor according to the power factor control signal and outputting it. The operation of the conventional apparatus configured as described above will be described.

먼저, 입력되는 교류전원(AC)을 정류부(11)에서 입력받아 브리지 다이오드를 이용하여 정류를 행하고, 이렇게 정류된 직류전압을 평활용 커패시터(C)로 출력시킨다.First, the AC power input AC is inputted from the rectifier 11 to perform rectification using a bridge diode, and the rectified DC voltage is output to the smoothing capacitor C.

그러면 상기 평활용 커패시터(C)는 상기 정류부(11)에서 출력되는 직류전압을 받아 평활시키고 이 평활된 전압을 인버터부(13)로 출력시킨다.Then, the smoothing capacitor C receives and smoothes the DC voltage output from the rectifying unit 11 and outputs the smoothed voltage to the inverter unit 13.

상기 인버터부(12)는 6개의 스위칭소자를 이용하여 압축기용모터(M)를 구동시키기 위하여 상기 평활용 커패시터(C)에서 출력되는 직류전압을 3상 교류전압(Uu,Vv,Ww)으로 변환시켜 상기 압축기용모터(M)로 공급한다.The inverter unit 12 converts the DC voltage output from the smoothing capacitor C into three-phase AC voltages Uu, Vv, and Ww to drive the compressor motor M using six switching elements. It is supplied to the compressor motor (M).

이에따라, 상기 압축기용모터(M)가 구동된다.Accordingly, the compressor motor M is driven.

상기 압축기용모터(M)가 구동될 때, 제어부(13)는 상기 압축기용모터(M)의 회전자의 위치를 검출하여 그에 따른 구동제어신호를 구동부(14)로 출력함과 아울러 상기 압축기용모터(M)의 부하량을 검출하여 그에 따른 역률제어신호를 역률개선부(15)에 출력한다.When the compressor motor (M) is driven, the control unit 13 detects the position of the rotor of the compressor motor (M) and outputs the drive control signal accordingly to the drive unit 14 and also for the compressor The load amount of the motor M is detected, and the corresponding power factor control signal is output to the power factor improving unit 15.

이에 따라, 상기 구동부(14)는 상기 제어부(13)의 구동제어신호에 따른 구동신호를 상기 인버터부(13)에 인가하여 스위칭소자의 스위칭을 제어하고, 역률개선부(15)는 상기 정류부(11)의 정류전압을 입력받아 이를 역률제어신호에 따라 역률을 조절하여 평활용커패시터(C)를 통해 인버터부(12)에 인가함으로써 압축기용모터(M)의 부하에 적절한 3상교류전원을 제공한다.Accordingly, the driving unit 14 applies a driving signal according to the driving control signal of the control unit 13 to the inverter unit 13 to control the switching of the switching element, and the power factor improving unit 15 is the rectifying unit ( 11) Receives the rectified voltage of 11) and adjusts the power factor according to the power factor control signal and applies it to the inverter unit 12 through the smoothing capacitor C to provide a three-phase AC power suitable for the load of the compressor motor M. do.

이때, 상기 역률개선부(15)는 초기 전원투입시 동작되어 전압을 승압시키고, 전원을 차단하거나 압축기용모터(M)를 정지시키면 역률 조절 동작이 오프된다.At this time, the power factor improving unit 15 is operated when the initial power is turned on to boost the voltage, and the power factor adjustment operation is turned off when the power is cut off or the compressor motor M is stopped.

그러나, 상기와 같이 비엘디씨모터가 장착된 압축기의 구동시 저속으로 운전하는 경우에는 인가전압이 상대적으로 낮은데, 초기 기동시부터 역률제어회로가 동작하게 되면 직류링크전압이 상용교류전압을 정류했을때의 전압보다 크게 되고,이로 인해 모터에 인가되는 전압의 듀티가 낮게 되어 모터가 정상적으로 운전되지 않는 문제점이 있었다.However, when operating at low speed when driving a compressor equipped with a BC motor as described above, the applied voltage is relatively low. When the power factor control circuit operates from the initial startup, when the DC link voltage rectifies the commercial AC voltage. Since the voltage is greater than, the duty of the voltage applied to the motor is lowered, so that the motor does not operate normally.

따라서, 상기와 같은 문제점을 감안하여 창안한 본 발명은 직류링크전압이 이상과전압 또는 이상저전압으로 감지되면 역률개선회로의 동작을 억제시켜 저속 운전시 비엘디씨모터의 기동성을 향상시킬 수 있도록 한 인버터 에어컨의 역률제어장치 및 방법을 제공함에 그 목적이 있다.Accordingly, the present invention devised in view of the above problems is to suppress the operation of the power factor correction circuit when the DC link voltage is detected as abnormal overvoltage or abnormal undervoltage to improve the maneuverability of the BMC motor at low speed operation. The purpose of the present invention is to provide a power factor control apparatus and method.

도1은 종래 인버터 에어컨의 역률 제어장치에 대한 구성을 보인 블록도.1 is a block diagram showing a configuration for a power factor control device of a conventional inverter air conditioner.

도2는 본 발명 인버터 에어컨의 역률 제어장치에 대한 구성을 보인 블록도.Figure 2 is a block diagram showing the configuration for the power factor control device of the present invention inverter air conditioner.

도3은 본 발명 인버터 에어컨의 역률 제어방법에 대한 동작흐름도.Figure 3 is an operation flow chart for a power factor control method of the inverter air conditioner of the present invention.

*****도면의 주요부분에 대한 부호의 설명********** Description of the symbols for the main parts of the drawings *****

11:정류부 12:인버터부11: Rectifier 12: Inverter

13:제어부 14:구동부13: control unit 14: driving unit

15:역률개선부 16:직류링크전압감지부15: Power factor improvement unit 16: DC link voltage detection unit

상기와 같은 목적을 달성하기 위한 본 발명은 상용교류전원을 정류하는 정류부와, 이 정류부의 정류신호를 평활용커패시터를 통해 평활하여 입력받아 3상교류전원으로 변환하는 인버터부와, 상기 정류부와 평활용커패시터 사이에 위치하여 상기 정류부의 정류전압에 대한 역률을 역률제어신호에 따라 조절하는 역률개선부를 구비한 인버터 에어컨에 있어서, 상기 평활용커패시터를 통해 인버터부에 인가되는 직류링크전압을 감지하여 출력하는 직류링크전압감지부와; 상기 직류링크전압감지부로부터 감지된 직류링크전압을 입력받아 그에 따른 역률제어신호를 상기 역률개선부로 출력하는 제어부를 포함하여 구성한 것을 특징으로 한다.The present invention for achieving the above object is a rectifying unit for rectifying the commercial AC power source, the inverter unit for converting the rectified signal of the rectifying unit into a three-phase AC power by smoothly received through a smoothing capacitor, and the rectifying unit and the flat In an inverter air conditioner having a power factor improving unit positioned between utilization capacitors and adjusting a power factor of the rectified voltage of the rectifying unit according to a power factor control signal, the DC link voltage applied to the inverter unit is output through the smoothing capacitor. A DC link voltage detection unit; And a controller configured to receive the DC link voltage sensed by the DC link voltage detection unit and output a power factor control signal to the power factor improving unit.

상기와 같은 목적을 달성하기 위한 본 발명은 압축기용모터에 대한 구동명령이 입력되면 그 압축기용모터의 직류링크전압을 감지하는 제1 단계와; 감지된 직류링크전압의 레벨에 따라 역률개선부가 동작되는 압축기용모터의 설정속도를 달리하여 그에 따른 듀티패턴을 설정하는 제2 단계와; 상기 제2 단계에서 설정된 듀티패턴으로 압축기용모터를 구동하여 그 압축기용모터의 구동속도가 설정속도와 일치하면 역률개선부를 동작시키는 제3 단계로 수행함을 특징으로 한다.The present invention for achieving the above object comprises a first step of detecting a DC link voltage of the compressor motor when a drive command for the compressor motor is input; A second step of setting a duty pattern according to a setting speed of the compressor motor in which the power factor improving unit is operated according to the detected level of the DC link voltage; The compressor may be driven by the duty pattern set in the second step. When the driving speed of the compressor motor matches the set speed, the third step of operating the power factor improving unit may be performed.

이하, 본 발명에 의한 인버터 에어컨의 역률제어장치 및 방법에 대한 작용과 효과를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, the operation and effects of the power factor control apparatus and method of the inverter air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

도2는 본 발명 인버터 에어컨의 역률제어장치에 대한 구성을 보인 블록도로서, 이에 도시한 바와같이 상용교류전원(AC)을 입력받아 이를 정류하는 정류부(11)와; 상기 정류부(11)의 정류신호를 평활용커패시터(C)를 통해 평활하여 입력받아 구동신호에 의해 3상교류전원으로 변환하는 인버터부(12)와; 상기 인버터부(12)의 3상교류전원을 입력받아 그에 따라 구동되는 압축기용모터(M)와; 상기 평활용커패시터 (C)를 통해 인버터부(12)에 인가되는 직류링크전압을 감지하여 출력하는 직류링크전압감지부(16)와; 상기 압축기용모터(M)의 회전자의 위치를 검출하여 그에 따른 구동제어신호를 출력함과 아울러 압축기용모터(M)에 걸리는 부하량및 상기 직류링크전압감지부(16)로부터 감지된 직류링크전압을 입력받아 따른 역률제어신호를 출력하는 제어부(13)와; 상기 제어부(13)의 구동제어신호를 입력받아 그에 따른 구동신호를 상기 인버터부(12)에 인가하는 구동부(14)와; 상기 정류부(11)와 평활용커패시터(C) 사이에 위치하여, 상기 정류부(11)의 정류전압을 입력받아 이를 역률제어신호에 따라 역률을 조절하여 출력하는 역률개선부(15)로 구성한다.Figure 2 is a block diagram showing the configuration of the power factor control device of the inverter air conditioner, as shown in the rectifier 11 for receiving a commercial AC power supply and rectifying it; An inverter unit 12 which smoothly receives the rectified signal of the rectifier 11 through a smoothing capacitor C and converts the rectified signal into a three-phase AC power by a drive signal; A compressor motor (M) which receives the three-phase AC power of the inverter unit 12 and is driven accordingly; A DC link voltage sensing unit 16 for sensing and outputting a DC link voltage applied to the inverter unit 12 through the smoothing capacitor C; Detects the position of the rotor of the compressor motor (M) and outputs a drive control signal accordingly, as well as the load applied to the compressor motor (M) and the DC link voltage detected by the DC link voltage detecting unit (16). A control unit 13 for receiving a power factor control signal according to the input signal; A driving unit 14 receiving the driving control signal of the control unit 13 and applying the driving signal to the inverter unit 12 accordingly; Located between the rectifier 11 and the smoothing capacitor (C), it receives the rectified voltage of the rectifier 11 is composed of a power factor improving unit 15 for adjusting the power factor according to the power factor control signal and output.

도3은 본 발명 인버터 에어컨의 역률제어방법에 대한 실시예의 동작흐름도로서, 이에 도시한 바와같이 압축기용모터(M)에 대한 구동명령이 입력되면 그 압축기용모터 (M)의 직류링크전압을 감지하는 제1 단계와; 감지된 직류링크전압의 레벨에 따라 역률개선부(15)가 동작되는 압축기용모터(M)의 설정속도를 달리하여 그에 따른 듀티패턴을 설정하는 제2 단계와; 상기 제2 단계에서 설정된 듀티패턴으로 압축기용모터(M)를 구동하여 그 압축기용모터(M)의 구동속도가 설정속도와 일치하면 역률개선부(15)를 동작시키는 제3 단계로 이루어지며, 이와같은 본 발명의 동작을 설명한다.3 is an operation flowchart of an embodiment of a power factor control method of an inverter air conditioner according to the present invention. As shown in FIG. 3, when a driving command for a compressor motor M is input, a DC link voltage of the compressor motor M is detected. A first step of doing; A second step of setting a duty pattern according to the setting speed of the compressor motor M in which the power factor improving unit 15 operates according to the sensed level of the DC link voltage; And a third step of operating the power factor improving unit 15 when the compressor motor M is driven with the duty pattern set in the second step and the driving speed of the compressor motor M coincides with the set speed. Such operation of the present invention will be described.

먼저, 일반적인 동작은 종래와 동일하다. 즉, 입력되는 교류전원(AC)을 정류부(11)에서 입력받아 브리지 다이오드를 이용하여 정류를 행하고, 이렇게 정류된 직류전압을 평활용 커패시터(C)로 출력시킨다.First, the general operation is the same as in the prior art. That is, the AC power input AC is inputted from the rectifier 11 to rectify using the bridge diode, and the rectified DC voltage is output to the smoothing capacitor C.

그러면 상기 평활용 커패시터(C)는 상기 정류부(11)에서 출력되는 직류전압을 받아 평활시키고 이 평활된 전압을 인버터부(13)로 출력시킨다.Then, the smoothing capacitor C receives and smoothes the DC voltage output from the rectifying unit 11 and outputs the smoothed voltage to the inverter unit 13.

상기 인버터부(12)는 6개의 스위칭소자를 이용하여 압축기용모터(M)를 구동시키기 위하여 상기 평활용 커패시터(C)에서 출력되는 직류전압을 3상 교류전압(Uu,Vv,Ww)으로 변환시켜 상기 압축기용모터(M)로 공급한다.The inverter unit 12 converts the DC voltage output from the smoothing capacitor C into three-phase AC voltages Uu, Vv, and Ww to drive the compressor motor M using six switching elements. It is supplied to the compressor motor (M).

이에따라, 상기 압축기용모터(M)가 구동된다.Accordingly, the compressor motor M is driven.

상기 압축기용모터(M)가 구동될 때, 제어부(13)는 상기 압축기용모터(M)의 회전자의 위치를 검출하여 그에 따른 구동제어신호를 구동부(14)로 출력하고, 그러면 상기 구동부(14)는 상기 제어부(13)의 구동제어신호에 따른 구동제어신호를 상기 인버터부(12)에 인가하여 스위칭소자의 스위칭을 제어한다.When the compressor motor M is driven, the control unit 13 detects the position of the rotor of the compressor motor M and outputs a driving control signal according to the driving unit 14, and then the driving unit ( 14 applies a drive control signal corresponding to the drive control signal of the controller 13 to the inverter unit 12 to control the switching of the switching element.

이때, 직류링크전압감지부(16)는 상기 평활용커패시터(C)를 통해 인버터부(12)에 인가되는 직류링크전압을 감지하여 상기 제어부(13)에 출력하고, 이에 의해 상기 제어부(13)는 상기 직류링크전압감지부(16)의 직류링크전압이 이상 과전압 또는 이상 저전압일 경우에 역률개선부(15)의 동작을 정지시키도록 제어한다.At this time, the DC link voltage detecting unit 16 detects the DC link voltage applied to the inverter unit 12 through the smoothing capacitor C and outputs the DC link voltage to the control unit 13, whereby the control unit 13 The control unit stops the operation of the power factor improving unit 15 when the DC link voltage of the DC link voltage detecting unit 16 is an abnormal overvoltage or abnormal undervoltage.

그리고, 상기 제어부(13)는 상기 직류링크전압의 레벨에 따라 상기 역률개선부(15)가 동작되는 압축기용모터(M)의 속도를 미리 설정하여 그 압축기용모터(M)의 구동속도와 설정속도가 일치하면 역률개선부(15)를 동작시키도록 제어하는데, 즉 기동시 입력의 역률이 역률규제치에 접근한 값이 되는 속도에서 역률개선부(15)를 온/오프 제어한다.The control unit 13 presets the speed of the compressor motor M in which the power factor improving unit 15 operates according to the level of the DC link voltage, and sets the drive speed of the compressor motor M in advance. If the speeds match, the power factor improving unit 15 is operated to be operated, that is, the power factor improving unit 15 is turned on / off at a speed at which the power factor of the input at the time of starting becomes a value approaching the power factor regulating value.

그리고, 상기 역률개선부(15)는 상기 정류부(11)의 정류전압을 입력받아 이를 역률제어신호에 따라 역률을 조절하여 평활용커패시터(C)를 통해 인버터부(12)에 인가함으로써 압축기용모터(M)의 부하에 적절한 3상교류전원을 제공하는데, 즉 직류링크전압이 낮을 때는 부하가 다소 작은 속도에서 동작하고, 직류링크전압이 높을 때는 부하가 높은 속도에서 동작하게 된다.The power factor improving unit 15 receives the rectified voltage of the rectifier 11 and adjusts the power factor according to the power factor control signal and applies the rectified voltage to the inverter unit 12 through the smoothing capacitor C. Providing an appropriate three-phase AC power supply for the load of (M), that is, when the DC link voltage is low, the load operates at a slightly smaller speed, and when the DC link voltage is high, the load operates at a high speed.

이상에서 상세히 설명한 바와같이 본 발명은 기동시 직류링크전압을 승압하지 않으므로 상대적으로 모터의 듀티를 크게 하여 모터의 위치감지를 용이하게 하고, 또한 전원전압의 변동분을 포함하여 기동듀티를 보상하여 모터의 기동성을 향상시키며, 또한 모터의 정지시 부하가 작은 저속까지 낮추어 역률개선회로의 동작을 오프시킴으로써 상기 역률개선회로의 갑작스런 부하변도을 저감시켜 직류링크전압의 급격한 상승을 역제하여 회로의 신뢰성을 향상시키고, 또한 직류링크전압을 감지하여 이상과전압, 이상저전압시 역률개선회로의 동작을 정지시켜 모터의 기동성을 향상시킬 수 있는 효과가 있다.As described in detail above, the present invention does not boost the DC link voltage during startup, so that the duty of the motor is relatively increased, thereby facilitating the position detection of the motor, and compensating the starting duty including the variation of the power supply voltage. It improves the maneuverability and reduces the sudden load variation of the power factor improving circuit by lowering the operation of the power factor improving circuit by lowering the load to a low speed when the motor is stopped, thereby improving the reliability of the circuit by counteracting the sudden rise of the DC link voltage. In addition, it detects the DC link voltage and stops the operation of the power factor improving circuit in the case of abnormal overvoltage and abnormal undervoltage, thereby improving the mobility of the motor.

Claims (3)

상용교류전원을 정류하는 정류부와, 이 정류부의 정류신호를 평활용커패시터를 통해 평활하여 입력받아 3상교류전원으로 변환하는 인버터부와, 상기 정류부와 평활용커패시터 사이에 위치하여 상기 정류부의 정류전압에 대한 역률을 역률제어신호에 따라 조절하는 역률개선부를 구비한 인버터 에어컨에 있어서, 상기 평활용커패시터를 통해 인버터부에 인가되는 직류링크전압을 감지하여 출력하는 직류링크전압감지부와; 상기 직류링크전압감지부로부터 감지된 직류링크전압을 입력받아 그에 따른 역률제어신호를 상기 역률개선부로 출력하는 제어부를 포함하여 구성한 것을 특징으로 하는 인버터 에어컨의 역률제어장치.A rectifier for rectifying commercial AC power, an inverter for smoothly receiving a rectified signal from the rectifier through a smoothing capacitor and converting the signal into a three-phase AC power supply, and a rectified voltage between the rectifying part and the smoothing capacitor. An inverter air conditioner having a power factor improving unit for adjusting a power factor to a power factor control signal, the inverter air conditioner comprising: a DC link voltage sensing unit for sensing and outputting a DC link voltage applied to the inverter unit through the smoothing capacitor; And a controller configured to receive the DC link voltage sensed by the DC link voltage detection unit and output a power factor control signal to the power factor improving unit. 제1 항에 있어서, 제어부는 감지된 직류링크전압이 이상과전압 또는 이상 저전압일 경우 역률개선부의 동작을 정지시키는 것을 특징으로 하는 인버터 에어컨의 역률제어장치.The power factor control apparatus of claim 1, wherein the controller stops the operation of the power factor improving unit when the detected DC link voltage is an abnormal overvoltage or abnormal undervoltage. 압축기용모터에 대한 구동명령이 입력되면 그 압축기용모터의 직류링크전압을 감지하는 제1 단계와; 감지된 직류링크전압의 레벨에 따라 역률개선부가 동작되는 압축기용모터의 설정속도를 달리하여 그에 따른 듀티패턴을 설정하는 제2 단계와; 상기 제2 단계에서 설정된 듀티패턴으로 압축기용모터를 구동하여 그 압축기용모터의 구동속도가 설정속도와 일치하면 역률개선부를 동작시키는 제3 단계로 수행함을 특징으로 하는 인버터 에어컨의 역률제어방법.A first step of detecting a DC link voltage of the compressor motor when a driving command for the compressor motor is input; A second step of setting a duty pattern according to a setting speed of the compressor motor in which the power factor improving unit is operated according to the detected level of the DC link voltage; And a third step of operating the power factor improving unit when the compressor motor is driven with the duty pattern set in the second step and the driving speed of the compressor motor matches the set speed.
KR1019990026830A 1999-07-05 1999-07-05 Power factor control apparatus and method for inverter airconditioner KR20010008813A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100823922B1 (en) * 2006-03-14 2008-04-22 엘지전자 주식회사 Apparatus and method for supplying dc power source
KR20200003656A (en) * 2018-07-02 2020-01-10 (주)에이엠케이 The brushless dc motor with the controller of power factor correction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0835712A (en) * 1994-07-26 1996-02-06 Fujitsu General Ltd Controller for air conditioner
JPH11125454A (en) * 1997-10-22 1999-05-11 Mitsubishi Heavy Ind Ltd Inverter and air conditioner equipped with the same
JPH11252991A (en) * 1998-03-05 1999-09-17 Fujitsu General Ltd Air conditioner controller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0835712A (en) * 1994-07-26 1996-02-06 Fujitsu General Ltd Controller for air conditioner
JPH11125454A (en) * 1997-10-22 1999-05-11 Mitsubishi Heavy Ind Ltd Inverter and air conditioner equipped with the same
JPH11252991A (en) * 1998-03-05 1999-09-17 Fujitsu General Ltd Air conditioner controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100823922B1 (en) * 2006-03-14 2008-04-22 엘지전자 주식회사 Apparatus and method for supplying dc power source
KR20200003656A (en) * 2018-07-02 2020-01-10 (주)에이엠케이 The brushless dc motor with the controller of power factor correction

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