KR20100048547A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
KR20100048547A
KR20100048547A KR1020080107760A KR20080107760A KR20100048547A KR 20100048547 A KR20100048547 A KR 20100048547A KR 1020080107760 A KR1020080107760 A KR 1020080107760A KR 20080107760 A KR20080107760 A KR 20080107760A KR 20100048547 A KR20100048547 A KR 20100048547A
Authority
KR
South Korea
Prior art keywords
current
overcurrent
power
air conditioner
power factor
Prior art date
Application number
KR1020080107760A
Other languages
Korean (ko)
Inventor
정춘길
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020080107760A priority Critical patent/KR20100048547A/en
Publication of KR20100048547A publication Critical patent/KR20100048547A/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
    • F25B49/022—Compressor 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
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/70—Regulating power factor; Regulating reactive current or power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/26—Power factor control [PFC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P31/00—Arrangements for regulating or controlling electric motors not provided for in groups H02P1/00 - H02P5/00, H02P7/00 or H02P21/00 - H02P29/00

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

PURPOSE: An air-conditioner is provided to enable a user to easily detect an excess current within a specific driving area and to control a circuit. CONSTITUTION: An air-conditioner comprises a power factor improving unit(112), a current detector(118), a power device(116), and a controller(120). The power factor improving unit is switched to output a current based on a DC power source created by rectifying an AC power source. The current detector detects current and outputs adetection current. The power device creates phase signals and outputs the phase signals to a compressor. The controller controls the power factor improving unit to prevent an excess current from being supplied to the power device.

Description

Air Conditioner

The present invention relates to an air conditioner, and more particularly, to an air conditioner that is capable of easily detecting overcurrent by improving overcurrent detection.

In general, an air conditioner is a home appliance for maintaining indoor air in a state most suitable for use and purpose. For example, in summer, the room is cooled to a cool state, in winter, the room is heated to a warm state, and also the humidity of the room, and the air in the room to a clean state of clean. As life convenience products such as air conditioners are gradually expanded and used, consumers are demanding high energy use efficiency, performance improvement and convenience products.

Such an air conditioner includes a separate air conditioner in which an indoor unit and an outdoor unit are separately separated, an integrated air conditioner in which the indoor unit and the outdoor unit are combined into one device, a wall-mounted air conditioner and a frame type air conditioner configured to be mounted on a wall, and a living room. A slim air conditioner configured to stand, a single air conditioner configured to be used in a small place such as a home, and a large air capacity composed of a very large capacity for use in a company or a restaurant. The air conditioner is divided into a multi-type air conditioner having a capacity capable of sufficiently driving a plurality of indoor units.

An object of the present invention is to improve the overcurrent detection to provide an air conditioner that is easy to detect the overcurrent.

An air conditioner according to the present invention includes: a power factor correction unit (PFC) for switching an AC power to a rectified DC power source so as to output a current, a current sensing unit for detecting the current and outputting a detected current, based on the current The detection current is compared with the first overcurrent level for a predetermined time after the switching-on time of the power device and the power factor improving unit that generates and outputs a phase signal to the compressor, and the detection current is compared with the second overcurrent level after the predetermined time elapses. And a control unit controlling the power factor improving unit so that overcurrent is not supplied to the power device.

The air conditioner according to the present invention sets the different overcurrent levels in the whole product operating area to determine the overcurrent for the input current, making it easy to determine the overcurrent in a specific operating area and differentiating the detection time to provide the overcurrent detection function and the circuit control accordingly. It has an easy effect.

The air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing an air conditioner according to a first embodiment of the present invention.

Referring to FIG. 1, the air conditioner includes an indoor unit 10 and an outdoor unit 20, and the indoor unit 10 blows an indoor heat exchanger 12 that heat-exchanges indoor air and a refrigerant, and blows the heat-exchanged indoor air. It includes a room blower (14).

Here, the indoor blower 14 includes an indoor fan (not shown) and a fan motor (not shown).

In addition, the outdoor unit 20 includes an outdoor heat exchanger 22 for exchanging outdoor air and a refrigerant, an outdoor blower 24 for blowing the heat exchanged outdoor air, and a compressor 26 for compressing the refrigerant.

2 is a functional block diagram showing an air conditioner according to a first embodiment of the present invention.

2, the air conditioner includes a compressor motor 100, an inverter circuit 110, and a controller 120.

Here, the compressor motor 100 is at least one of a sensor motor and a sensorless motor, and the sensor motor and the sensorless motor may be driven separately at the same time. In addition, the compressor motor 100 operates by varying an operating frequency under the control of the controller 120 according to the load capacity of the compressor 26.

The inverter circuit 110 rectifies AC power and outputs a DC power rectifier 112, a power factor correcting unit (PFC) 114 that is switched to output a current following the DC power, and a phase signal based on the current. And a power device 116 that generates and outputs the output to the compressor 26, and a current sensing unit 118 that detects the current and outputs the detected current to the controller 120.

That is, the power factor improving unit 114 includes a reactor (not shown) and a capacitor (not shown) for improving the power factor (harmonics) from the DC power source, the reactor stores energy, and the capacitor charges and discharges. If there is a sudden change in the DC power supply, the reactor serves to supplement the current, thereby minimizing the influence of harmonic distortion.

In addition, the power factor improving unit 114 further includes a switch element (not shown) that is switched on or off by the controller 120, and the switching time of the switch element is adjusted to maintain the current constant. .

In addition, the power device 116 receives the current and converts the phase signal into the phase signal for driving the compressor motor 100 to output it.

At this time, the phase signal is a three-phase phase signal to adjust the speed of the compressor motor (100).

The current sensing unit 118 is connected to the power factor improving unit 114 to detect the current, and transmits the detection current for the current to the control unit 120.

The controller 120 receives the detection current and controls the supply of the overcurrent to the power device 116 in comparison with the set overcurrent level.

That is, the controller 120 compares the detected current with a first overcurrent level for a predetermined time after the compressor motor 100 starts to operate and the switching power factor improving unit 110 is switched on, and after the predetermined time elapses, the detected current. Is compared with the second overcurrent level.

Herein, the control unit 120 may prevent the reactor of the power factor improving unit 110 from being shorted or an overcurrent applied when switching on the power factor improving unit 110 due to another failure mode. The detection current is compared with the first overcurrent level until the predetermined time after the switching-on time of.

That is, the first overcurrent level is set smaller than the second overcurrent level.

Since the current is low when the compressor motor 100 is initially operated, the controller 120 compares the detection current to the first overcurrent level lower than the second overcurrent level, and accurately determines whether the current is an overcurrent.

After the predetermined time elapses, the controller 120 compares the detected current with the second overcurrent level to determine whether the overcurrent is supplied due to an increase in the load capacity of the compressor motor 100.

In this case, when it is determined that the detected current compared to the first and second overcurrent levels is an overcurrent, the control unit 120 adjusts the switching on or off and the switching time of the backflow improvement unit 110 to the power device 116. Control so that the current is not supplied.

3 is a graph showing the overcurrent level of the air conditioner according to the present invention.

Referring to FIG. 3, the present air conditioner has first and second overcurrent levels Level_1 and Level_2 set, and indicates an operating frequency Comp hz of the compressor motor 100 according to the load capacity.

Herein, the control unit 120 controls the detected current detected by the first overcurrent level Level_1 and the current sensing unit 118 for a predetermined time after the compressor motor 100 is operated and the power factor improving unit 110 is switched on. Compare.

In this case, when the detection current is lower than the first overcurrent level Level_1, the controller 120 turns on or off the switch element of the power factor improving unit 110 with a normal switching time.

In addition, the controller 120 compares the detection current with the second overcurrent level Level_2 after the predetermined time elapses, and when the detection current is lower than the second overcurrent level Level_2, the power factor improving unit The switch element of 110 is turned on or off.

The air conditioner according to the present invention compares the first and second overcurrent levels with the detection current for the current supplied to the power element according to the operation frequency of the compressor motor, which varies according to the operating characteristics and load capacity, and supplies the overcurrent to the power element. By controlling so as to prevent damage, there is an advantage of preventing damage to the power element due to overcurrent, malfunction of the peripheral circuit, and damage, and accurate overcurrent can be detected.

Although a preferred embodiment of the present invention has been described in detail above, those skilled in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Accordingly, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

1 is a perspective view showing an air conditioner according to a first embodiment of the present invention.

2 is a functional block diagram showing an air conditioner according to a first embodiment of the present invention.

3 is a graph showing the overcurrent level of the air conditioner according to the present invention.

Claims (4)

A power factor correction unit (PFC) which is switched to output a current by following the rectified DC power to the AC power; A current detector for detecting the current and outputting a detected current; A power device generating a phase signal based on the current and outputting the phase signal to a compressor; And The detection current is compared with a first overcurrent level for a predetermined time after the switching-on time of the power factor improving unit, and after the predetermined time elapses, the detection current is compared with a second overcurrent level so that the overcurrent is not supplied to the power device. An air conditioner including a control unit for controlling the power factor improving unit. The method of claim 1, wherein the first overcurrent level, And an air conditioner smaller than the second overcurrent level. The method of claim 1, wherein the control unit, And controlling the switching time of the power factor improving unit so that the phase signal is maintained at a constant voltage. The method of claim 1, wherein the control unit, And the first and second overcurrent levers are variably set according to the load capacity of the compressor.
KR1020080107760A 2008-10-31 2008-10-31 Air conditioner KR20100048547A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080107760A KR20100048547A (en) 2008-10-31 2008-10-31 Air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080107760A KR20100048547A (en) 2008-10-31 2008-10-31 Air conditioner

Publications (1)

Publication Number Publication Date
KR20100048547A true KR20100048547A (en) 2010-05-11

Family

ID=42275298

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020080107760A KR20100048547A (en) 2008-10-31 2008-10-31 Air conditioner

Country Status (1)

Country Link
KR (1) KR20100048547A (en)

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