KR20100012077A - Motor controller of air conditioner - Google Patents

Motor controller of air conditioner Download PDF

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Publication number
KR20100012077A
KR20100012077A KR1020080073619A KR20080073619A KR20100012077A KR 20100012077 A KR20100012077 A KR 20100012077A KR 1020080073619 A KR1020080073619 A KR 1020080073619A KR 20080073619 A KR20080073619 A KR 20080073619A KR 20100012077 A KR20100012077 A KR 20100012077A
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KR
South Korea
Prior art keywords
power
commercial
wiring
unit
converter
Prior art date
Application number
KR1020080073619A
Other languages
Korean (ko)
Inventor
이충훈
Original Assignee
엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020080073619A priority Critical patent/KR20100012077A/en
Publication of KR20100012077A publication Critical patent/KR20100012077A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • 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
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/32—Details or features not otherwise provided for preventing human errors during the installation, use or maintenance, e.g. goofy proof
    • 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
    • F25B2600/11—Fan speed control

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE: A motor control device for an air-conditioner is provided to block a power source by sensing the misconnection and disconnection of commercial AC power of a three-phase four-wire system. CONSTITUTION: A motor control device for an air-conditioner comprises a converter(210), a misconnection sensor(202), and a power blocking part(204). The converter changes the commercial AC power of a three-phase four-wire system into DC power. The misconnection sensor compares a potential electric difference between the three-phase of the commercial AC power and a ground wire and senses either a misconnection or a disconnection. The power blocking part blocks the supply of the commercial AC power applied to the converter when a misconnection or disconnection is sensed.

Description

Motor controller of air conditioner {Motor controller of air conditioner}

The present invention relates to a motor control apparatus for an air conditioner, and more particularly, to a motor control apparatus for an air conditioner capable of protecting circuit elements in the control apparatus when using a three-phase four-wire commercial AC power supply.

An air conditioner is a device that is disposed in a room, a living room, an office, or a business store to adjust a temperature, humidity, cleanliness, and airflow of an air to maintain a comfortable indoor environment.

Air conditioners are generally divided into one-piece and separate types. The integrated type and the separate type are functionally the same, but the integrated type integrates the functions of cooling and heat dissipation to install a hole in the wall of the house or hang the device on the window, and the separate type installs an indoor unit that performs cooling / heating on the indoor side and outdoor. On the side, an outdoor unit that performs heat dissipation and compression functions was installed, and two separate devices were connected by refrigerant pipes.

In the air conditioner, an electric motor is used for a compressor, a fan, and the like, and an electric motor control device for driving the air conditioner is used. The motor controller of the air conditioner receives a commercial AC power and converts it into a DC voltage, converts the DC voltage into a commercial AC power with a predetermined frequency, and supplies the motor to the motor to control a motor such as a compressor or a fan.

On the other hand, a plurality of switching elements are used in the motor control apparatus of the air conditioner, and a driving voltage for driving them is applied to the switching elements, respectively. However, if there is an abnormality in the application of such a driving voltage, since the possibility of damage to most circuit elements in the motor control apparatus without a separate protection device is increased, various methods have been proposed to protect it.

It is an object of the present invention to provide an electric motor control apparatus of an air conditioner capable of protecting circuit elements in a control apparatus when using a three-phase four-wire commercial AC power supply.

The motor control apparatus of the air conditioner according to the embodiment of the present invention for solving the above-mentioned problems and other problems, the converter for receiving a three-phase four-wire commercial AC power input and converting into a DC power, and three of the commercial AC power supply Incorrect connection detection unit for detecting at least one of the wiring and the wiring by comparing the potential difference between each phase and the ground wire, and a power cut-off unit to cut off the supply of commercial AC power applied to the converter when at least one of the wiring and the wiring is detected Include.

In addition, the motor control apparatus of the air conditioner according to the embodiment of the present invention for solving the above-described and other problems is a control device of an air conditioner including a plurality of outdoor units, the first outdoor unit is a three-phase A converter that receives 4-wire commercial AC power and converts it into a first DC power source; a miswiring detection unit that detects at least one of a wiring and a wiring of the commercial AC power; and when at least one of the wiring and a wiring is detected, the converter And a power interrupter to block supply of commercial AC power applied thereto, and the second outdoor unit includes a rectifier configured to receive a three-phase four-wire commercial AC power and convert it into a second DC power source, and the power interrupter is applied to the rectifier. Shut off the supply of commercial AC power.

As described above, the motor control apparatus of the air conditioner according to the embodiment of the present invention, by detecting the incorrect wiring of the three-phase four-wire commercial AC power to cut off the power, it is possible to protect the circuit elements in the control device.

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

1 is a schematic diagram of an air conditioner according to the present invention.

Referring to the drawings, the air conditioner 40 is largely divided into an indoor unit (I) and an outdoor unit (O).

The outdoor unit O includes a compressor 2 serving to compress the refrigerant, a compressor electric motor 2b for driving the compressor, an outdoor side heat exchanger 4 serving to radiate the compressed refrigerant, and an outdoor unit. An outdoor blower 4 disposed on one side of the heat exchanger 4 and including an outdoor fan 4a for promoting heat dissipation of the refrigerant and an electric motor 4b for rotating the outdoor fan 4a, and an expansion for expanding the condensed refrigerant; The mechanism 6, the cooling / heating switching valve 10 for changing the flow path of the compressed refrigerant, and the accumulator 3 for temporarily storing the gasified refrigerant to remove moisture and foreign matter and then supplying a refrigerant of a constant pressure to the compressor. And the like.

The indoor unit (I) is disposed inside the indoor heat exchanger (8) performing cooling / heating functions, and the indoor fan (9a) and the indoor disposed at one side of the indoor heat exchanger (8) to promote heat dissipation of the refrigerant. And an indoor blower 9 made of an electric motor 9b for rotating the fan 9a.

At least one indoor side heat exchanger (8) may be installed. The compressor 2 may be at least one of an inverter compressor and a constant speed compressor.

In addition, the air conditioner 40 may be configured as a cooler for cooling the room, or may be configured as a heat pump for cooling or heating the room.

On the other hand, the electric motor in the motor control apparatus of the air conditioner according to an embodiment of the present invention may be each electric motor (2b, 5b, 9b) to operate the outdoor fan, compressor or indoor fan shown in the figure.

2 is a circuit diagram illustrating a motor control apparatus of an air conditioner according to an embodiment of the present invention.

Referring to the drawings, the motor control apparatus 200 of the air conditioner of FIG. 2 includes a miswiring detection unit 202, a power cutoff unit 204, a converter 210, and an inverter 220. In addition, the motor control apparatus 200 of the air conditioner of FIG. 2 includes a filter unit 205, a converter micom 230, an inverter micom 240, an input current detecting means A, a smoothing capacitor C11, and a dc. The voltage detection means D and the output current detection means E may be further included.

The incorrect wiring detection unit 202 detects at least one of the wiring and the wiring of the three-phase four-wire commercial AC power supply. Specifically, the miswiring detection unit 202 detects at least one of miswiring and wiring by comparing the potential difference between each of the three phases R, S, and T of the commercial AC power supply and the ground line N. To this end, the miswiring detector 202 may include a resistance element connected to each of the phases R, S, and T, and the ground line N, respectively. When a voltage above the first reference value or a voltage below the second reference value is detected through the resistance element, it is determined as a wiring or a wiring. This determination may be performed by the converter microcomputer 230 described later.

The power cutoff unit 204 cuts off the supply of commercial AC power applied to the converter 210 when at least one of a wiring and a wiring is detected from the wiring connection detecting unit 202. To this end, the power cutoff unit 204 may include a relay device that cuts off the supply of commercial AC power applied to the converter 210 in an on / off operation.

For example, when a voltage exceeding a first reference value is detected through the miswiring detector 202, the relay element may be turned on to cut off commercial AC power applied to the converter 210. When the miswiring is not detected, the relay element may be turned off to normally supply commercial AC power to the converter 210.

In the drawing, the miswiring detection unit 202 and the filter unit 205 are connected to each other, and the operation of the commercial AC power supply is not limited thereto. However, the present invention is not limited thereto. It can be connected at the rear stage to decide to cut off or supply commercial AC power.

On the other hand, the operation of the miswiring detection unit 202 may be controlled by the converter micom 230 to be described later.

The filter unit 205 filters the noise component or harmonic current component of the three-phase four-wire commercial AC power supply. To this end, the filter unit 205 may include a reactor element or a capacitor element. When the filter unit 205 includes a reactor element, the boosted AC power may be supplied to the converter in combination with the switching operation of the converter described later. In addition, the filter unit 205 may improve the power factor.

Here, the three-phase four-wire commercial AC power supply consists of three phases of R, S, and T, and an N phase connected to a ground line.

The converter 210 includes a plurality of converter switching elements, and converts the three-phase four-wire commercial AC power passed through the filter unit 205 into a DC power source by an on / off operation of the switching element. In order to convert three-phase AC power to DC power as shown in the drawing, three pairs of upper and lower arm switching elements are connected in parallel with each other, and diodes are connected in reverse parallel to each switching element. When the converter switching control signal Scc from the converter micom 230 is input to the gate terminal of each switching element, each switching element performs a switching operation.

The smoothing capacitor C11 is connected to the output terminal of the converter 210. The converted DC power output from the converter 210 is smoothed. Hereinafter, the output terminal of the converter 210 is referred to as a dc terminal or a dc link terminal. The DC voltage smoothed at the dc stage is applied to the inverter 220.

The inverter 220 includes a plurality of inverter switching elements, and converts the DC power smoothed by the on / off operation of the switching element into commercial AC power having a predetermined frequency and outputs the same. Specifically, the upper arm switching element and the lower arm switching element connected to each other in a pair, a total of three pairs of upper and lower arm switching elements are connected in parallel to each other. Each switching device has a diode in anti-parallel connection. When the inverter switching control signal Sic from the inverter micom 240 is input to the gate terminal of each switching element, each switching element performs a switching operation. As a result, a three-phase AC power supply having a predetermined frequency is output.

Three-phase AC power output from the inverter 220 is applied to each phase of the three-phase electric motor 250. Here, the three-phase electric motor 250 is provided with a stator and a rotor. Each phase AC power of a predetermined frequency is applied to a coil of each stator so that the rotor rotates. The three-phase motor 250 may be a variety of forms, such as BLDC motor, synRM motor. On the other hand, if the three-phase electric motor 250 is classified by function, it may be a compressor electric motor (2b) used in the compressor of the air conditioner, it may be a fan motor (5b, 9b) for driving the fan.

The converter microcomputer 230 outputs the converter switching control signal Scc to the converter 210 in order to control the switching operation of the converter. The switching control signal Scc is a PWM switching control signal. The switching control signal Scc is generated based on the detected input current i i and the dc terminal voltage Vdc and is output to the converter 210.

On the other hand, the converter microcomputer 230 may receive a voltage value detected through the resistance element in the miswiring detector 202 and determine whether it is a miswiring or a wiring. That is, the converter micom 230 determines that the detected voltage is a wiring or a wiring when a voltage above the first reference value or a voltage below the second reference value is detected.

In addition, the converter microcomputer 230 may control the on / off operation of the relay element in the power interrupting unit 204 in accordance with the determination of the wiring or the wiring.

Meanwhile, the converter microcomputer 230 outputs the switching control signal Sic for the inverter to the inverter 220 in order to control the switching operation of the inverter. The switching control signal Sic is a switching control signal for PWM and is generated based on the detected output current i o and output to the inverter 220.

Meanwhile, although the converter micom 230 and the converter micom 230 are separately shown in the drawings, the present invention is not limited thereto, and the converter micom 230 and the converter micom 230 may be implemented as one common micom.

On the other hand, the input current detecting means A detects the input current i i from the commercial AC power supply. The input current detecting means A may be located between the commercial AC power supply and the converter 210, but the input current detecting means A is located between the commercial AC power supply and the filter unit 205. As the input current detecting means A, a current sensor, a CT (current trnasformer), a shunt resistor, or the like may be used. The detected input current i i is applied to the converter micom 230 and is used for the generation of the converter switching control signal Scc and the protection operation such as overcurrent.

The dc end voltage detection means D detects the dc end voltage Vdc. As the dc stage voltage detecting means D, a resistor or the like may be used between both ends of the dc stage. The detected dc terminal voltage Vdc is applied to the converter microcomputer 230 to be used for generation of the converter switching control signal Scc and protection operations such as overvoltage.

The output current detecting means E detects the output current i o of the inverter output stage, that is, the current applied to the motor. The output current detecting means E may be located between the inverter 220 and the motor 250, and a current sensor, a current trnasformer (CT), a shunt resistor, or the like may be used to detect the current. In addition, the output current detecting means E may be a shunt resistor having one end connected to each of the three lower arm switching elements in the inverter. The detected output current i o is applied to the inverter microcomputer 240 and used for the generation of the inverter switching control signal Sic and the protection operation such as overcurrent.

In this way, by using the miswiring detection unit 202 and the power cutoff unit 204, the miswiring of the three-phase four-wire commercial AC power supply can be sensed to cut off the power, thereby protecting circuit elements in the control device. do.

3 is a bird's eye view of an air conditioner including a plurality of outdoor units according to the present invention.

Referring to the drawings, an air conditioner including a plurality of outdoor units includes a plurality of indoor units I 'installed in an interior of a building for cooling or heating operation, an indoor unit I', and a refrigerant pipe P '. A plurality of outdoor units (M) (S1) (S2) connected through a), and a control device (not shown) for controlling the indoor unit (I ') and outdoor unit (M) (S1) (S2).

The outdoor unit (M) (S1) (S2) is driven by the request of at least one of the indoor unit (I '), and the outdoor unit (M) (S1) (as the cooling / heating capacity required by the indoor unit (I') increases. The operation number of S2) and the operation number of the compressor installed in the outdoor unit M (S1) (S2) are increased.

As shown in FIG. 1, each indoor unit I 'is the room in which the indoor heat exchanger 8 which heat-exchanges the refrigerant | coolant with the indoor air of the room in which each indoor unit I' is installed, and the room where each indoor unit I 'is installed. It may include an indoor blower (9) for blowing the indoor air to the indoor heat exchanger (8), and an indoor electronic expansion valve (not shown) that is an indoor flow rate control unit controlled according to the supercooling and superheating degree during the cooling operation.

The indoor heat exchanger (8) is an evaporator that allows the indoor air to be cooled while the liquid refrigerant is sucked in the cooling operation of the air conditioner and the sucked liquid refrigerant is evaporated by the indoor air in which the indoor unit (I ') requesting the cooling operation is installed. The gaseous refrigerant is sucked during the heating operation of the air conditioner, and the sucked gaseous refrigerant is acted as a condenser that causes the indoor air temperature to rise while condensed by the indoor air in which the indoor unit I which requested the heating operation is installed.

The indoor blower 9 is controlled by an indoor unit controller (not shown) to generate power by being connected to the indoor electric motor 9b to generate power and rotated by the indoor electric motor 9b to generate a blowing force. It consists of an indoor fan 9a.

The plurality of outdoor units M, S1, and S2 are main outdoor units M that are always operated regardless of the load of the indoor unit I 'and sub outdoor units S1 that are selectively operated according to the load of the indoor unit I'. ) S2.

As shown in FIG. 1, the main outdoor unit M and the sub outdoor unit S1 and S2 blow the outdoor heat exchanger 4 through which the outdoor air and the refrigerant are heat exchanged, and blow the outdoor air to the outdoor heat exchanger 4. An outdoor blower (5), an accumulator (3) for extracting only gas refrigerant, a compressor (2) for compressing gas refrigerant extracted from the accumulator (3), a four-way valve (10) for switching refrigerant flow, and heating It includes an outdoor electronic expansion valve (6) controlled in accordance with the supercooling and superheating degree during operation.

The outdoor heat exchanger (4) acts as a condenser to suck the gaseous refrigerant during the cooling operation of the air conditioner and condense the sucked gaseous refrigerant by the outdoor air, and during the heating operation of the air conditioner, the liquid refrigerant is sucked and suctioned. It acts as an evaporator that allows the liquid refrigerant to be evaporated by the outdoor air.

The outdoor blower 5 is connected to the outdoor electric motor 5b, which is controlled by an outdoor unit controller (not shown) to generate power, and is rotated by the power of the outdoor electric motor 5b to be connected to the outdoor electric motor 5b. It consists of the outdoor fan 5a which generate | occur | produces.

It may include two compressors of the main outdoor unit (M), one may be an inverter compressor, the other may be a constant speed compressor. Meanwhile, the sub outdoor unit may also include two compressors, and both compressors may be constant speed compressors.

4 is a circuit diagram illustrating a motor control apparatus of an air conditioner according to an embodiment of the present invention.

Referring to the drawings, the motor control apparatus 400 of the air conditioner of FIG. 4 shows the motor control apparatus in the outdoor unit 401 of the air conditioner.

The motor control apparatus 400 of the air conditioner of FIG. 4 includes a miswiring detector 402, a power interrupter 404, a converter 410, a compressor inverter 420, and a fan inverter 422, 424. . In addition, the motor control apparatus 400 of the air conditioner of FIG. 4 includes a filter unit 405, a main microcomputer 430, a microcomputer for converter 432, a microcomputer for compressor 434, a microcomputer for fan 436, and smoothing. It may further include a capacitor (C).

A difference from the motor control apparatus 200 of the air conditioner of FIG. 2 is that a plurality of compressor electric motors and a plurality of fan electric motors are used. Accordingly, the compressor inverter 420, the compressor microcomputer 434, and the fan inverter ( 422, 424 and fan microcomputer 436 are used. In addition, the main microcomputer 430 is used for common control of the microcomputer 434 for the compressor and the microcomputer 436 for the fan.

On the other hand, it is also possible to operate the constant speed compressor 451 directly by a commercial AC power supply passing through the filter unit 405.

The operations of the miswiring detection unit 402 and the power cutoff unit 404 are the same as those described with reference to FIG. 2. Meanwhile, the control of the miswiring detector 420 and the power cut-off unit 404 may be performed by the converter microcomputer 432 as shown in FIG. 2, but is not limited thereto and may be performed by the main microcomputer 430.

In this way, in the control device of the air conditioner including a plurality of outdoor units, by using the miswiring detection unit 402 and the power cut-off unit 404, by detecting the miswiring of the three-phase four-wire commercial AC power supply to the power supply It can be cut off, thereby protecting the circuit elements in the control device.

5 is a circuit diagram illustrating a motor control apparatus of an air conditioner according to an embodiment of the present invention.

Referring to the drawings, the motor control apparatus 500 of the air conditioner of FIG. 5 shows the motor control apparatus of the first outdoor unit 501 and the second outdoor unit 502. That is, unlike the motor control apparatus 400 of the air conditioner of FIG. 4, the apparatus further includes a motor controller of the plurality of outdoor units, particularly the second outdoor unit 502. The following description will focus on the differences.

The motor control apparatus 500 of the air conditioner of FIG. 5 includes a filter unit 507, a rectifier D1, fan inverters 526 and 528, a fan microcomputer 539 and a main microcomputer 538 in the second outdoor unit 502. It may further include.

The rectifier D1 receives a commercial AC power and converts the DC power into a DC power without a switching operation. To this end, the rectifying unit D1 may include a diode device.

The main microcomputer 538 may control communication with the first outdoor unit or the microcomputer 839 for the fan.

On the other hand, it is also possible to operate the constant speed compressors 557 and 559 directly by a commercial AC power supply passing through the filter unit 507.

The operations of the miswiring detection unit 502 and the power cutoff unit 504 are the same as those described with reference to FIG. 2. Meanwhile, the control of the miswiring detector 520 and the power cutoff unit 504 may be performed by the converter micom 532 as shown in FIG. 2, but is not limited thereto and may be performed by the main micom 530.

As described above, in the control device of the air conditioner including a plurality of outdoor units, by using the miswiring detection unit 502 and the power cutoff unit 504, the miswiring of the three-phase four-wire commercial AC power is sensed to supply power. It can be cut off, thereby protecting the circuit elements in the control device.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

1 is a schematic diagram of an air conditioner according to the present invention.

2 is a circuit diagram illustrating a motor control apparatus of an air conditioner according to an embodiment of the present invention.

FIG. 3 is a view illustrating the step-down part and the gate driver of FIG. 2.

4 is a circuit diagram illustrating a motor control apparatus of an air conditioner according to an embodiment of the present invention.

5 is a circuit diagram showing a motor control apparatus of the air conditioner according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

202,402,502: incorrect wiring detection unit 204,404,504: power off unit

205, 405, 505: filter unit 210, 410, 510: converter

220: inverter

Claims (13)

A converter for receiving a three-phase four-wire commercial AC power and converting it into a DC power; A miswiring detector configured to sense at least one of the miswiring and wiring by comparing a potential difference between each of the three phases of the commercial AC power supply and a ground line; And And a power cut-off unit that cuts off the supply of the commercial AC power applied to the converter when at least one of the wiring and the wiring is sensed. The method of claim 1, The incorrect wiring detection unit, An electric motor controller of an air conditioner, comprising: a resistance element connected to each phase and a ground line. The method of claim 1, The power cut off unit, And a relay element for shutting off the supply of the commercial AC power applied to the converter in an on / off operation. The method of claim 1, And a microcomputer for controlling the power cut-off unit to cut off the supply of the commercial AC power when at least one of the wiring and the wiring is sensed. The method of claim 1, And an inverter configured to receive the DC power and convert the AC power into an AC power by a switching operation to drive an electric motor. The method of claim 1, A compressor inverter that receives the DC power and converts the AC power into AC power by a switching operation to drive a compressor motor; and And a fan inverter configured to receive the DC power and convert the AC power into an AC power by a switching operation to drive the fan motor. In the control device of the air conditioner including a plurality of outdoor units, The first outdoor unit includes a converter for receiving a three-phase four-wire commercial AC power to convert the first DC power; A miswiring detector for sensing at least one of a miswiring and a wiring of the commercial AC power supply; And a power cut-off unit which cuts off the supply of the commercial AC power applied to the converter when at least one of the wiring and the wiring is detected. And a second outdoor unit comprising: a rectifying unit receiving the three-phase four-wire commercial AC power and converting the same into a second DC power. The electric power cut-off unit further controls the supply of the commercial AC power applied to the rectifier. The method of claim 7, wherein The incorrect wiring detection unit, Comparing the potential difference between each of the three phases of the commercial AC power supply and the ground line to detect at least one of the wiring and wiring. The method of claim 7, wherein The incorrect wiring detection unit, An electric motor controller of an air conditioner, comprising: a resistance element connected to each phase and a ground line. The method of claim 7, wherein The power cut off unit, And a relay element which cuts off the supply of the commercial AC power applied to the converter in an on / off operation. The method of claim 7, wherein And a microcomputer for controlling the power cut-off unit to cut off the supply of the commercial AC power when at least one of the wiring and the wiring is sensed. The method of claim 7, wherein The first outdoor unit, A compressor inverter configured to receive the first DC power and convert it into AC power by a switching operation to drive a compressor motor; and And a first outdoor unit fan inverter configured to receive the first DC power and convert it into AC power by a switching operation to drive a fan motor. The method of claim 7, wherein The second outdoor unit And a second outdoor unit fan inverter configured to receive the second DC power and convert the AC power into an AC power by a switching operation to drive a fan motor.
KR1020080073619A 2008-07-28 2008-07-28 Motor controller of air conditioner KR20100012077A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101237363B1 (en) * 2010-11-24 2013-02-28 주식회사 이피코 Control Method For Pulsewidth Modulation Converter
KR20130098705A (en) * 2012-02-28 2013-09-05 위니아만도 주식회사 Driving error detection method for compressor of refrigerator
CN108152737A (en) * 2017-12-15 2018-06-12 格力电器（武汉）有限公司 A kind of anti-motor line sequence fault monitoring system and its monitoring method
WO2019187003A1 (en) * 2018-03-30 2019-10-03 日本電気株式会社 State estimation device, method, and program recording medium
KR102114308B1 (en) * 2019-01-10 2020-05-22 엘지전자 주식회사 Air conditioner
KR20200077716A (en) * 2018-12-21 2020-07-01 엘지전자 주식회사 Air-conditioner
KR102153851B1 (en) * 2019-12-18 2020-09-09 이계광 Miswiring detection method for power surge protective device with preventing malfunction of residual current detector
CN115275961A (en) * 2022-08-18 2022-11-01 宁波奥克斯电气股份有限公司 Three-phase power supply misconnection protection circuit and air conditioner

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101237363B1 (en) * 2010-11-24 2013-02-28 주식회사 이피코 Control Method For Pulsewidth Modulation Converter
KR20130098705A (en) * 2012-02-28 2013-09-05 위니아만도 주식회사 Driving error detection method for compressor of refrigerator
CN108152737A (en) * 2017-12-15 2018-06-12 格力电器（武汉）有限公司 A kind of anti-motor line sequence fault monitoring system and its monitoring method
WO2019187003A1 (en) * 2018-03-30 2019-10-03 日本電気株式会社 State estimation device, method, and program recording medium
US11358086B2 (en) 2018-03-30 2022-06-14 Nec Corporation State estimation apparatus, method, and program storage medium
KR20200077716A (en) * 2018-12-21 2020-07-01 엘지전자 주식회사 Air-conditioner
KR102114308B1 (en) * 2019-01-10 2020-05-22 엘지전자 주식회사 Air conditioner
KR102153851B1 (en) * 2019-12-18 2020-09-09 이계광 Miswiring detection method for power surge protective device with preventing malfunction of residual current detector
CN115275961A (en) * 2022-08-18 2022-11-01 宁波奥克斯电气股份有限公司 Three-phase power supply misconnection protection circuit and air conditioner

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