WO2011138864A1 - 冷凍装置 - Google Patents
冷凍装置 Download PDFInfo
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- WO2011138864A1 WO2011138864A1 PCT/JP2011/002523 JP2011002523W WO2011138864A1 WO 2011138864 A1 WO2011138864 A1 WO 2011138864A1 JP 2011002523 W JP2011002523 W JP 2011002523W WO 2011138864 A1 WO2011138864 A1 WO 2011138864A1
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- voltage
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- refrigerant
- motor
- circuit
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- 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
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- 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
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- 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- 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
- F25B31/00—Compressor arrangements
- F25B31/006—Cooling of compressor or motor
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- 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
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
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- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/003—Indoor unit with water as a heat sink or heat source
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/004—Outdoor unit with water as a heat sink or heat source
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/021—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit
-
- 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
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- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the present invention relates to a refrigeration apparatus.
- an electric circuit such as an inverter circuit is mounted in order to control the operation state of the motor of the compressor.
- a power element that generates high heat is used in this inverter circuit. Therefore, a means for cooling the power element is provided so that the temperature does not become higher than the operable temperature of the power element (see, for example, Patent Document 1).
- Patent Document 1 a refrigerant cooler in which a refrigerant between an expansion valve of a refrigerant circuit and an outdoor heat exchanger flows is brought into contact with the power element, and the power element is cooled by the refrigerant flowing through the refrigerant cooler. The configuration is described.
- an IGBT bare chip IGBT: Insulated Gate Bipolar Transistor
- a heat spreader IGBT: Insulated Gate Bipolar Transistor
- an internal electrode IGBT
- an insulating plate IGBT bare chip
- a metal plate In the power element having such a structure, a capacitor having an insulating plate as a dielectric is formed between the internal electrode and the metal plate inside the power element.
- a capacitor having a package as a dielectric is formed between the metal plate inside the power element and the refrigerant cooler. These capacitors are connected in series.
- the refrigerant cooler is connected to the refrigerant pipe and grounded through a casing and a ground wire.
- a high-frequency current flows through a capacitor formed between the switching element and the refrigerant cooler due to a potential fluctuation between the internal electrodes and ground.
- This high-frequency current flows out of the apparatus through the casing and the ground wire. If the high-frequency current that flows out of the apparatus in this way exceeds a predetermined magnitude, it may cause noise problems such as miscellaneous edges (noise terminal voltage) and leakage current.
- noise problems such as miscellaneous edges (noise terminal voltage) and leakage current.
- the present invention has been made in view of this point, and an object of the present invention is to provide a high-frequency that leaks from the refrigerant cooler when the switching element is cooled by using the refrigerant cooler in which the refrigerant flowing through the refrigerant circuit flows.
- the object is to effectively reduce the current.
- the present invention relates to a refrigerant circuit (10) in which a compressor (11), a heat source side heat exchanger (12), an expansion mechanism (13), and a use side heat exchanger (14) are connected to perform a refrigeration cycle.
- a compressor 11
- a heat source side heat exchanger (12)
- an expansion mechanism 13
- a use side heat exchanger (14)
- the first invention is The compressor (11), the heat source side heat exchanger (12), the expansion mechanism (13), and the use side heat exchanger (14) are connected to each other, and the refrigerant circuit (10) that performs the refrigeration cycle is provided.
- a refrigeration device A power module (61) including a plurality of switching elements (37) for converting an input voltage into an AC voltage having a predetermined frequency and voltage value;
- a drive motor (18) for driving the compressor (11);
- a rectifier circuit (32) for supplying a DC link voltage (vdc) to the power module (61);
- a refrigerant cooler (81) for circulating the refrigerant in the refrigerant circuit (10) and cooling the power module (61);
- Control means 60) for controlling the drive of each switching element (37) and performing control in which a carrier period (T) in which switching is not performed exists.
- the input voltage is converted into an AC voltage having a predetermined frequency and voltage value by driving and controlling the plurality of switching elements (37).
- Each switching element (37) is cooled by dissipating heat to the refrigerant circulating in the refrigerant cooler (81).
- Each switching element (37) is controlled by the control means (60) so that there is a carrier cycle in which switching is not performed.
- the switching element (37) when the switching element (37) is attached to the refrigerant cooler (81) formed of the conductor, the power module (61) is interposed between the power module (61) and the refrigerant cooler (81). A capacitor using a resin mold package that constitutes a dielectric as a dielectric is formed. The capacitor is grounded via the refrigerant pipe of the refrigerant cooler (81).
- the switching element (37) when the switching element (37) performs a switching operation, a high-frequency current flows through the capacitor due to a potential variation between the internal electrodes of the switching element (37).
- the high-frequency current flows out of the apparatus through a casing and a ground wire containing the heat source side heat exchanger (12) and the compressor (11).
- the compressor (11) when the compressor (11) is operated at a high output, the surge voltage increases as the output current increases, so that the high-frequency current flowing out of the device exceeds a predetermined magnitude, and the other end ( Noise terminal voltage) and leakage current may cause noise problems.
- the present invention since there is a carrier cycle in which switching is not performed, the number of times of switching of the switching element (37) is reduced, and the level of the high-frequency current is reduced.
- the second invention is in the first invention,
- the control means (60) superimposes harmonics that increase in the vicinity of the peak and bottom of the fundamental wave of the motor terminal voltage so that the amplitude becomes the DC link voltage (vdc) and decrease in amplitude in other parts. Control is performed so that the carrier period (T) in which the switching is not performed while maintaining the magnitude of the fundamental wave is increased as compared with the case of sine wave driving.
- the motor terminal voltage is instantaneously increased by superimposing harmonics on the fundamental wave component of the motor terminal voltage.
- the carrier period which does not perform switching can be created.
- the third invention is In the first or second invention,
- the control means (60) performs control in which there is a carrier cycle (T) in which the switching is not performed by increasing the voltage during energization by shortening the energization section of the switching element (37) to less than 180 degrees. It is characterized by performing.
- the current-carrying section is made shorter than 180 degrees to create a section that does not require switching.
- the fourth invention is: In any one of the first to third inventions,
- the drive motor (18) is an IPM motor
- the control means (60) adjusts the motor terminal voltage in the same operating state by controlling a voltage phase or a current phase applied to the drive motor.
- the fifth invention is: In any one of the first to fourth inventions, The control means (60) does not perform the switching when the target value of the motor terminal voltage exceeds the DC link voltage (vdc).
- the switching element (37) when the switching element (37) is cooled using the refrigerant cooler (81), the high-frequency current leaking from the refrigerant cooler (81) is effectively reduced, resulting in the leakage current. Noise can be reduced.
- FIG. 1 is a circuit diagram illustrating a schematic configuration of an air-conditioning apparatus that is an example of a refrigeration apparatus according to an embodiment of the present invention.
- FIG. 2 is a circuit diagram illustrating a schematic configuration of a drive circuit of the power supply apparatus.
- FIG. 3 is a cross-sectional view showing the vicinity of the switching element and the refrigerant cooler.
- FIG. 4A is an example of a phase voltage waveform in which every carrier switching is performed
- FIG. 4B is an example of a phase voltage waveform when a harmonic is superimposed on the fundamental wave component of the output voltage of the power module. is there.
- FIG. 5 is a graph showing the relationship between the rotational speed of the compressor and the inverter loss.
- FIG. 6 shows a phase voltage waveform when the fundamental wave component of the motor terminal voltage exceeds the DC link voltage .
- FIG. 7 is a common mode equivalent circuit according to the first embodiment.
- FIG. 8 is a common mode equivalent circuit in a non-grounded power supply apparatus.
- FIG. 9 shows the result of the high frequency current generated in the equivalent circuits of FIGS. 7 and 8 obtained by simulation.
- FIG. 10 is a diagram showing switching patterns corresponding to the simulations of FIG.
- FIG. 11 is a circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Modification 1.
- FIG. 12 is a cross-sectional view showing the vicinity of the switching element and the refrigerant cooler.
- FIG. 13 is a timing chart for explaining a switching pattern according to the second modification.
- FIG. 14 is a timing chart for explaining a switching pattern when the energization interval is shorter than 180 degrees, and (A) and (B) are U phases when the interval for switching and controlling the voltage is shortened, respectively.
- V phase voltage waveform (C) is the output line voltage (between UV phases) of the inverter circuit.
- FIG. 15 is a vector diagram of the motor terminal voltage, (A) is a vector diagram during maximum efficiency control, and (B) is a vector diagram when the current phase is delayed from the state of maximum efficiency control.
- FIG. 1 is a circuit diagram illustrating a schematic configuration of an air conditioner that is an example of a refrigeration apparatus according to an embodiment of the present invention.
- the air conditioner (1) according to the embodiment of the present invention includes a refrigerant circuit (10) that performs a vapor compression refrigeration cycle.
- the refrigerant circuit (10) includes a four-way switching valve (17), and the refrigerant circulation is configured to be reversible.
- the four-way switching valve (17) is provided in FIG. 1 and the refrigerant circulation is configured to be reversible, the refrigerant circulation without the four-way switching valve (17) may be irreversible.
- the discharge side of the compressor (11) is connected to the first port of the four-way switching valve (17) via the discharge pipe (21).
- One end of the gas pipe (22) is connected to the second port of the four-way selector valve (17).
- the other end of the gas pipe (22) is connected to the gas side end of the heat source side heat exchanger (12).
- the heat source side heat exchanger (12) is constituted by, for example, a fin-and-tube heat exchanger or a water heat exchanger.
- a fan (not shown) as a means for exchanging heat of the refrigerant is arranged close to each other and water is allowed to flow.
- the structure which flows a fan and water is an example to the last, and is not limited to this form.
- One end of the liquid pipe (23) is connected to the liquid side end of the heat source side heat exchanger (12).
- the liquid pipe (23) is provided with an expansion valve (13). Further, a refrigerant cooler (81) for cooling a switching element (37) described later is provided on the heat source side heat exchanger (12) side of the liquid pipe (23) from the expansion valve (13). . The other end of the liquid pipe (23) is connected to the liquid side end of the use side heat exchanger (14).
- the use side heat exchanger (14) is constituted by, for example, a fin-and-tube heat exchanger, a water heat exchanger, or the like.
- the usage-side heat exchanger (14) is configured such that a fan (not shown) as a means for exchanging heat of the refrigerant is disposed in close proximity or water flows.
- a fan not shown
- the structure which flows a fan and water is an example to the last, and is not limited to this form.
- One end of a gas communication pipe (24) is connected to the gas side end of the use side heat exchanger (14).
- the other end of the gas communication pipe (24) is connected to the fourth port of the four-way switching valve (17).
- the four-way selector valve (17) includes first to fourth ports, and communicates the first port with the second port and the third state with the fourth port (see FIG. 1). (Solid line) and a second state (broken line in FIG. 1) in which the first port and the fourth port communicate with each other and the second port and the third port communicate with each other.
- One end of the suction pipe (25) is connected to the third port of the four-way switching valve (17).
- the other end of the suction pipe (25) is connected to the compressor (11).
- An accumulator (15) for removing liquid refrigerant contained in the refrigerant and sucking only the gas refrigerant into the compressor (11) is provided in the middle of the pipe of the suction pipe (25).
- the air conditioner (1) is provided with a power supply device (30) for supplying power to each drive unit of each component of the refrigerant circuit (10).
- FIG. 2 is a circuit diagram showing a schematic configuration of a drive circuit of the power supply apparatus.
- the power supply device (30) includes a drive circuit (31) for controlling and converting the power supplied to each drive unit such as the drive motor (18) of the compressor (11). ing.
- FIG. 2 shows a drive circuit (31) for the compressor (11) connected to the drive motor (18) of the compressor (11) as an example of the drive circuit (31).
- the drive motor (18) is an IPM motor (Interior / Permanent / Magnet / Motor).
- IPM motor Interior / Permanent / Magnet / Motor
- a permanent magnet is embedded in a rotor, and a coil is wound around a stator.
- the drive circuit (31) includes a rectifier circuit (32) connected to a commercial power source (38) and an inverter circuit (34) connected to a drive motor (18) of a compressor (11) as a drive unit. Each has.
- the rectifier circuit (32) is connected to a commercial power source (38) that is an AC power source.
- the rectifier circuit (32) is a circuit for rectifying the AC voltage of the commercial power supply (38).
- the voltage rectified by the rectifier circuit (32) is referred to as a DC link voltage (vdc).
- the inverter circuit (34) converts the voltage rectified by the rectifier circuit (32) into an AC voltage and supplies the converted AC voltage to the drive motor (18) serving as a load.
- the switching element (37) is three-phase bridge-connected.
- the switching element (37) is connected to a coil (not shown) wound around the stator of the drive motor (18).
- the switching element (37) for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOS-FET (MOS Field Effect Transistor) is used.
- the switching element (37) does not have to be three-phase bridge-connected, and may be configured by the number of phases and the connection method suitable for the drive motor (18).
- the switching of the switching element (37) is controlled, whereby the AC voltage output to the drive motor (18) and its frequency are increased and decreased, and the rotational speed of the drive motor (18) is adjusted.
- the switching of the switching element (37) is controlled by the control device (60).
- the AC voltage of the commercial power supply (38) is converted into the AC voltage of a desired frequency in the drive circuit (31), and then the drive motor (18) of the compressor (11) is converted. ) Etc.
- the switching elements (37) of the compressor (11) and the drive circuit (31) of each component are bundled and packaged by a resin mold, One power module (61) is formed. Note that the power modules (61) need not be packaged together.
- the power module (61) is mounted on the substrate (71) together with other electrical components (not shown).
- the switching element (37) generates heat at a high temperature during operation. Therefore, a refrigerant cooler (81) for cooling the switching element (37) with the refrigerant flowing through the refrigerant circuit (10) is provided.
- the switching elements (37) for each component are collectively packaged and configured as one power module (61). As shown in FIG. 3, the power module (61) is attached so as to contact the refrigerant cooler (81).
- a capacitor using a package of the power module (61) as a dielectric is formed between the power module (61) and the refrigerant cooler (81).
- the refrigerant cooler (81) is formed in a flat rectangular parallelepiped shape, for example, by a metal such as aluminum (that is, a conductor), and a refrigerant flow path (81a) for circulating the refrigerant therein is formed.
- the refrigerant flow path (81a) may be formed by inserting a part of the refrigerant pipe, and the refrigerant pipe is connected to a tubular through hole cut out of the refrigerant cooler (81). It may be formed by. In this embodiment, it is formed by a part of the liquid pipe (23) between the heat source side heat exchanger (12) and the expansion valve (13) of the refrigerant circuit (10) inserted through the refrigerant cooler (81). (See FIG. 1).
- the refrigerant cooler (81) is configured to be able to circulate the refrigerant flowing through the refrigerant circuit (10). Further, the refrigerant cooler (81) is configured by a metal such as aluminum so that the cold heat of the refrigerant flowing through the refrigerant is transmitted to the outer surface. Thereby, the power module (61) brought into contact with the refrigerant cooler (81) is cooled by exchanging heat with the refrigerant flowing through the refrigerant cooler (81).
- the air conditioner (1) is provided with a control device (60) for drivingly controlling the drive parts of the components of the refrigerant circuit (10).
- the control device (60) outputs a drive signal to the drive circuit (31).
- the control device (60) controls the alternating voltage supplied to each drive unit and its frequency by controlling the switching operation of the switching element (37) constituting the power element. Specifically, the control device (60) sends the drive signal to the drive circuit of each drive unit (in the case of a motor, for example, the desired rotation speed or rotation speed and torque). 31) is output. The drive signal is input to a base circuit (not shown) of each switching element (37), and ON / OFF of each switching element (37) is controlled. In this example, the control device (60) controls ON / OFF of the switching element (37) by PWM (Pulse Width Modulation) control. In the PWM control, the carrier signal is used as a reference for ON / OFF control. As a result, the AC voltage supplied to each drive unit is controlled to a desired voltage and frequency. For example, the rotational speed of the drive motor (18) is a desired rotation. Number.
- PWM Pulse Width Modulation
- control device (60) controls to increase the carrier cycle in which the command voltage exceeds the DC link voltage by instantaneously increasing the motor terminal voltage by superimposing the harmonic wave on the fundamental wave component of the motor terminal voltage.
- the command voltage means a target value of the motor terminal voltage, that is, a target value of the output voltage of the inverter circuit (34).
- a capacitor using a package of the power module (61) as a dielectric is formed between the power module (61) and the refrigerant cooler (81).
- the capacitor is grounded via the refrigerant pipe of the refrigerant cooler (81).
- the switching element (37) performs a switching operation
- a high-frequency current flows through the capacitor due to a potential variation between the internal electrodes of the switching element (37).
- the power supply device (30) that is, the power module (61) is housed in a casing (not shown) together with the heat source side heat exchanger (12) and the compressor (11), and the high-frequency current flowing through the capacitor is As will be described in detail later, it flows out of the apparatus through the casing and the ground wire.
- the compressor (11) when the compressor (11) is operated at a high output, the surge voltage increases as the output current increases, so that the high-frequency current flowing out of the device exceeds a predetermined magnitude, and the other end ( Noise terminal voltage) and leakage current may cause noise problems.
- the switching element (37) when the switching element (37) is cooled using the refrigerant cooler (81), the number of times of switching can be reduced by superimposing harmonics on the motor terminal voltage.
- the switching waveform at this time is changed from the state of FIG. 4 (A) to the state of FIG. 4 (B), and control in which a carrier cycle (T) in which switching is not performed exists is performed.
- T a carrier cycle in which switching is not performed exists.
- the waveform is in a single-phase inverter, and when harmonics are not superimposed on the output voltage, switching is performed in all carrier periods as shown in FIG.
- harmonics are superimposed on the fundamental wave component of the motor terminal voltage, there are carrier periods that are not switched, as shown in FIG. FIG.
- control with a carrier cycle (T) in which switching is not performed means that the voltage rectified by the rectifier circuit (32) (DC link voltage) is applied to one or more carriers between any output lines of the inverter circuit.
- T carrier cycle
- the energization section As will be described in detail later, by making the energization section shorter than 180 degrees, it is only necessary to increase the required voltage at the time of energization and perform control in which there is a carrier cycle in which switching is not performed. In speed and load conditions where the command voltage cannot exceed the DC link voltage (vdc) under maximum efficiency control, the command voltage is increased by delaying the current phase to increase the DC link voltage (vdc) between the output lines. Can be applied to one or more carriers.
- the high-frequency current leaking from the refrigerant cooler (81) can be effectively reduced by the amount that the switching frequency is reduced.
- noise due to leakage current can be reduced, and the amount of heat generated by the switching element (37) can also be reduced.
- the switching waveform at the time of overmodulation control is shown in FIG. 6.
- the command voltage to PWM is set so that it exceeds the DC link voltage.
- the air conditioner (1) performs a cooling operation and a heating operation by switching the four-way switching valve (17).
- the four-way selector valve (17) is in the first state (solid line state in FIG. 1), the discharge side of the compressor (11) and the heat source side heat exchanger (12) communicate with each other, and the compressor The suction side of (11) communicates with the use side heat exchanger (14). Then, the compressor (11) is driven. As a result, the refrigerant circulates in the direction indicated by the solid arrow in FIG. 1, and a vapor compression refrigeration cycle in which the heat source side heat exchanger (12) functions as a condenser and the use side heat exchanger (14) functions as an evaporator. Done.
- the four-way selector valve (17) is in the second state (broken line state in FIG. 1), the discharge side of the compressor (11) and the use side heat exchanger (14) communicate with each other, and The suction side of the compressor (11) and the heat source side heat exchanger (12) communicate with each other. Then, the compressor (11) is driven. As a result, the refrigerant circulates in the direction indicated by the broken line arrow in FIG. 1, and a vapor compression refrigeration cycle in which the use side heat exchanger (14) functions as a condenser and the heat source side heat exchanger (12) functions as an evaporator. Done.
- the refrigerant condensed in the heat source side heat exchanger (12) flows in the refrigerant flow path in the refrigerant cooler (81) during the cooling operation, and in the use side heat exchanger (14) during the heating operation. After condensing, the decompressed refrigerant flows through the expansion valve (13).
- the temperature of the refrigerant flowing through the refrigerant cooler (81) varies depending on operating conditions and outside air conditions, but is about 50 ° C. during cooling operation and about 5 ° C. during heating operation, for example.
- the switching element (37) generates heat during operation, for example, about 80 ° C. Therefore, the switching element (37) has a higher temperature than the refrigerant flowing in the refrigerant cooler (81). The switching element (37) is cooled by dissipating heat to the low-temperature refrigerant flowing through the refrigerant flow path formed in the refrigerant cooler (81).
- a capacitor (hereinafter referred to as a stray capacitance (C)) in which the internal electrode of the switching element (37) and the refrigerant cooler (81) are electrodes and the package of the power module (61) is a dielectric. Called) is formed.
- a high-frequency current (leakage current) flows from the power module (61) side to the refrigerant cooler (81) side via the stray capacitance (C). ) Flows.
- the refrigerant cooler (81) Since the refrigerant cooler (81) is electrically connected to the casing via a liquid pipe (23) or the like, the high-frequency current flows to the casing through the liquid pipe (23) or the like as a propagation path, It will leak to the outside from the ground wire etc. connected to the casing.
- the high-frequency current leaking to the outside of the air conditioner (1) needs to be set to a value equal to or smaller than a predetermined value in accordance with laws and regulations.
- the frequency region of 150 kHz to 30 MHz is a problem as the noise terminal voltage.
- FIG. 7 is a common mode equivalent circuit in an air conditioner (1) including a grounded refrigerant cooler. Since the refrigerant cooler is grounded, the inductance (L) component and the stray capacitance (C) of the refrigerant cooler are connected to the ground line.
- FIG. 7 is a common mode equivalent circuit in an air conditioner (1) including a grounded refrigerant cooler. Since the refrigerant cooler is grounded, the inductance (L) component and the stray capacitance (C) of the refrigerant cooler are connected to the ground line.
- a power supply device (referred to as a non-grounded power supply device for convenience of description) having a power module with a non-grounded cooler.
- a non-grounded power supply device for convenience of description
- the cooler is not grounded, the inductance (L) component and stray capacitance (C) of the cooler can be ignored.
- FIG. 9 shows the result of the high frequency current generated in the equivalent circuits of FIGS. 7 and 8 obtained by simulation.
- the horizontal axis represents the frequency
- the vertical axis represents the noise terminal voltage, that is, the level of the high-frequency current (decibel display).
- the model of the drive motor (18) also includes an LC component, but this LC component is small, and the influence on a low frequency of 30 MHz or less may be ignored.
- FIG. 9 shows a high-frequency current when the power supply device (30) of the present embodiment is used, and a power supply device with a refrigerant cooler that has not taken any measures (hereinafter referred to as an unmeasured power supply device).
- the high-frequency current when using the non-grounded power supply device and the high-frequency current when using the non-grounding type power supply device are shown. Note that the calculation of the level (noise level) of the high-frequency current of the unmeasured power supply device is performed assuming that the control device (60) of the present embodiment performs switching in a normal switching operation, that is, all carrier cycles. .
- a peak appears at a predetermined frequency in the high-frequency current due to the action of the resonance circuit.
- the frequency of this peak is mainly determined by the LC component of the refrigerant cooler (81). Therefore, depending on the specifications of the air conditioner (1), this peak may enter a frequency region that becomes a problem due to the above-mentioned laws and regulations.
- the resonance point of the LC component has a low frequency of 30 MHz or less, which is a problem with the noise terminal voltage. Therefore, this noise may be a problem in cooling (refrigerant cooling) using the refrigerant cooler (81).
- noise filter It is conceivable to take measures against high frequency current having such a peak by providing a so-called noise filter. However, the addition of a noise filter is not preferable because it leads to an increase in size and cost of the apparatus.
- FIG. 10 is a diagram showing a switching pattern corresponding to each simulation of FIG.
- a waveform having 20 cycles of carrier rotation at one motor electrical angle is assumed.
- the switching pattern of a single phase inverter is assumed, and the noise reduction effect when the number of times of switching is reduced is verified.
- FIG. 10A shows the phase voltage waveform at this time.
- the noise level increases in the unmeasured power supply device (the power supply device that does not take any measures using the grounded refrigerant cooler described above).
- the noise level is reduced as the frequency is higher in the non-grounded power supply device, whereas in the non-measured power supply device, it has a peak at a certain frequency (about 6.8 MHz in the example of FIG. 9). (See line B in FIG. 9).
- the peak frequency of this noise level is the resonance frequency of the LC component in the refrigerant cooler (81).
- the noise level when the drive motor (18) is driven with the number of times of switching reduced to the limit is the line C in FIG.
- the state in which the number of times of switching is reduced to the limit is a mode in which the motor electrical angle half cycle is operated with one rectangular wave, and the phase voltage waveform is as shown in FIG.
- the switching element (37) is driven so as to have the waveform of FIG. 10 (B)
- the number of times of switching is reduced to 1/20 compared to when switching is performed every carrier cycle.
- the noise level is lowered as a whole because the number of times of switching is reduced. In the example shown in FIG. 9, there was a reduction of approximately 26 dB.
- the noise level can be reduced to a level close to that when switching is performed in all 20 cycles of the carrier using the non-grounded power supply device.
- the high-frequency current is reduced by switching control, there is almost no addition of new parts such as a noise filter. That is, the high-frequency current can be reduced without causing demerits such as an increase in size and cost of the entire apparatus due to the addition of new components such as a noise filter.
- the present embodiment is a useful technique for an air conditioner in which measures using a noise filter are increased in size and cost, such as an air conditioner that requires a relatively high voltage to secure a large amount of power. .
- the switching frequency of the switching element (37) is reduced, the energy causing noise is reduced in a wide frequency range. Therefore, in the present embodiment, the effect of reducing the high-frequency current is not exhibited only in a specific frequency region as in the noise filter, but the effect of reducing the high-frequency current can be exhibited in a wider frequency region.
- FIG. 11 is a circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Modification 1 of the present embodiment.
- the liquid pipe (23) is provided with an expansion valve (13).
- a branch circuit (26) for branching a part of the refrigerant directed to the expansion valve (13) is connected to the liquid pipe (23).
- the branch circuit (26) is provided with a refrigerant cooler (81) for cooling the switching element (37).
- an expansion valve (13a) for controlling the temperature of the refrigerant cooler (81) is connected to both ends of the refrigerant cooler (81) in the branch circuit (26).
- FIG. 12 is a cross-sectional view showing the vicinity of the switching element and the refrigerant cooler. As shown in FIG. 12, the power module (61) is connected to the substrate (71) by wiring and attached so as to contact the refrigerant cooler (81).
- the refrigerant cooler (81) is formed in a flat rectangular parallelepiped shape by a metal such as aluminum, for example, and a refrigerant flow path (81a) for circulating the refrigerant therein is formed.
- the number of power modules (61) and the number of refrigerant flow paths (81a) are merely examples, and are not limited to this form.
- FIGS. 13 and 14 are timing charts for explaining a switching pattern according to the modified example 2.
- (A) and (B) are U-phase and V-phase phase voltage waveforms during sine wave driving, respectively.
- C) is the output line voltage (between UV phases) of the inverter circuit (34).
- the phase voltage waveform of the three-phase inverter is examined as the power supply device (30).
- FIG. 14 is a timing chart for explaining a switching pattern when the energization interval is shorter than 180 degrees, and (A) and (B) are U phases when the interval for switching and controlling the voltage is shortened, respectively.
- V phase voltage waveform (C) is the output line voltage (between UV phase) of the inverter circuit (34).
- the figure shows the SW section (1) d in a state where the SW section (1) a and the SW section (2) a necessary for sine wave driving are shortened to increase the output voltage in the SW section.
- 100% voltage is output in the SW section (2) d (switching may be performed in this section depending on how the SW section (1) d and SW section (2) d are set).
- the U-phase and V-phase line voltages are as shown in FIG. 14C, and the current-carrying section is made shorter than 180 degrees to create a section that does not require switching. Therefore, also in this modification, the high-frequency current leaking from the refrigerant cooler (81) can be effectively reduced.
- FIG. 15 is a vector diagram of the motor terminal voltage
- (A) is a vector diagram during maximum efficiency control
- (B) is a vector diagram when the current phase is delayed from the state of maximum efficiency control. It is assumed that the winding resistance component R of the drive motor (18) is small and the term R is not shown in FIG.
- V motor terminal voltage
- Vd d-axis voltage
- Vq q-axis voltage
- I motor current
- Id d-axis current
- Iq q-axis current
- R motor winding.
- Resistance Ld: Motor d-axis inductance
- Lq Motor q-axis inductance
- ⁇ Motor magnetic flux difference intersection number
- ⁇ Rotational speed
- ⁇ Current phase.
- the term ⁇ LdId does not occur. Therefore, there is no term that cancels out the magnetic flux term ⁇ , and the motor terminal voltage can be increased. Note that (A) and (B) in FIG. 15 are described under the conditions of constant rotation speed and torque.
- the motor terminal voltage is increased to realize the command voltage exceeding the DC link voltage (vdc). It becomes possible. Further, by using an IPM motor having a relatively large inductance, the fluctuation of the ⁇ LdId component when the current phase is controlled becomes large. For this reason, the use of the IPM motor is a more effective configuration for increasing the motor terminal voltage. In this example, the current phase is controlled. However, in order to increase the motor terminal voltage, either the current phase or the voltage phase may be controlled.
- the IPM motor has a relatively large inductance. Therefore, a current ripple that becomes a problem when a control in which a carrier period in which switching is not performed exists is made can be reduced. Thereby, in the IPM motor, adverse effects such as an increase in heat generation due to an increase in current and a decrease in efficiency can be reduced.
- the IPM motor has a relatively large inductance, when it is desired to increase the motor terminal voltage by controlling the phase, a large change in the motor terminal voltage can be achieved with a small phase change compared to a motor with a small inductance. realizable. Therefore, in the IPM motor, it is easy to control the motor terminal voltage.
- the air conditioner (1) has been described as an example of the refrigeration apparatus according to the present invention, but the refrigeration apparatus according to the present invention is not limited to this.
- a freezer that cools the inside of a refrigerator or a freezer may be used.
- the position and method of taking out the refrigerant to the refrigerant cooler (81) are not limited, and any configuration is possible as long as the refrigerant pipe of the refrigerant circuit (10) and the refrigerant cooler (81) are connected. It may be a simple device.
- the present invention can be applied to control the power conversion circuit.
- a power conversion circuit for example, a so-called PWM converter
- the present invention can be applied to control the power conversion circuit.
- the present invention can effectively reduce the high-frequency current leaking from the refrigerant cooler when the switching element is cooled using the refrigerant cooler in which the refrigerant flowing through the refrigerant circuit flows. Since it is possible to obtain highly effective effects, it is extremely useful and has high industrial applicability.
- Air conditioning equipment (refrigeration equipment) DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 11 Compressor 12 Heat source side heat exchanger 13 Expansion valve (expansion mechanism) 14 User-side heat exchanger 18 Drive motor 37 Switching element 60 Control device (control means) 81 Refrigerant cooler
Abstract
Description
圧縮機(11)と、熱源側熱交換器(12)と、膨張機構(13)と、及び利用側熱交換器(14)とが接続されて冷凍サイクルを行う冷媒回路(10)を備えた冷凍装置であって、
入力電圧を所定の周波数及び電圧値の交流電圧に変換する複数のスイッチング素子(37)を備えたパワーモジュール(61)と、
前記圧縮機(11)を駆動する駆動モータ(18)と、
前記パワーモジュール(61)に直流リンク電圧(vdc)を供給する整流回路(32)と、
前記冷媒回路(10)における冷媒を内部に流通して前記パワーモジュール(61)を冷却する冷媒冷却器(81)と、
前記各スイッチング素子(37)を駆動制御して、スイッチングを行わないキャリア周期(T)が存在する制御を行う制御手段(60)とを備えたことを特徴とする。
第1の発明において、
前記制御手段(60)は、モータ端子電圧の基本波のピーク及びボトムの近傍では振幅が直流リンク電圧(vdc)になるように増加し、その他の部分では振幅が減少するような高調波が重畳された波形に制御して、前記基本波の大きさは保ちながら前記スイッチングを行わないキャリア周期(T)が正弦波駆動時よりも増加する制御を行うことを特徴とする。
第1又は2の発明において、
前記制御手段(60)は、前記スイッチング素子(37)の通電区間を180度よりも短くすることで、通電時の電圧を増加させて前記スイッチングを行わないキャリア周期(T)が存在する制御を行うことを特徴とする。
第1から3の発明のいずれかにおいて、
前記駆動モータ(18)は、IPMモータであり、
前記制御手段(60)は、前記駆動モータに印加する電圧位相又は電流位相を制御して同じ運転状態における前記モータ端子電圧を調整することを特徴とする。
第1から4の発明のいずれかにおいて、
前記制御手段(60)は、前記モータ端子電圧の目標値が前記直流リンク電圧(vdc)を超えた場合には、前記スイッチングを行わないことを特徴とする。
図1は、本発明の実施形態に係る冷凍装置の一例である空気調和装置の概略構成を示す回路図である。図1に示すように、本発明の実施形態に係る空気調和装置(1)は、蒸気圧縮式冷凍サイクルを行う冷媒回路(10)を備えている。
前記空気調和装置(1)には、冷媒回路(10)の各構成部品の各駆動部に電力を供給するための電力供給装置(30)が設けられている。
ところで、前記スイッチング素子(37)は、稼動時に高温発熱する。そのため、スイッチング素子(37)を冷媒回路(10)を流れる冷媒によって冷却するための冷媒冷却器(81)が設けられている。なお、上述したように、本実施形態では、各構成部品毎のスイッチング素子(37)が一纏まりとなってパッケージングされ、1つのパワーモジュール(61)として構成されている。図3に示すように、パワーモジュール(61)は、冷媒冷却器(81)に接触するように取り付けられている。ここで、パワーモジュール(61)と冷媒冷却器(81)との間には、パワーモジュール(61)のパッケージを誘電体としたコンデンサが形成される。
前記空気調和装置(1)には、冷媒回路(10)の各構成部品の駆動部を駆動制御するための制御装置(60)が設けられている。制御装置(60)は駆動回路(31)に対して駆動信号を出力する。
次に、前記空気調和装置(1)の運転動作を説明する。この空気調和装置(1)は、四路切換弁(17)を切り換えることにより、冷房運転と暖房運転とを行う。
冷房運転では、四路切換弁(17)は第1の状態(図1の実線状態)となり、圧縮機(11)の吐出側と熱源側熱交換器(12)とが連通し、且つ圧縮機(11)の吸入側と利用側熱交換器(14)とが連通する。そして、圧縮機(11)が駆動される。その結果、冷媒は、図1の実線矢印に示す方向に循環し、熱源側熱交換器(12)が凝縮器、利用側熱交換器(14)が蒸発器として機能する蒸気圧縮式冷凍サイクルが行われる。
前記冷凍サイクルが行われている間は、電力供給装置(30)から駆動モータ(18)に電力が供給される。この際、インバータ回路(34)では、PWM制御によって出力電圧を0Vおよび直流リンク電圧(vdc)に切替えるスイッチング動作が行われる。この例ではインバータ回路(34)において、スイッチング素子(37)の矩形波駆動が行われる。これにより、インバータ回路(34)では、急峻な電圧の立上がり及び立下りが起こり、その電圧が駆動モータ(18)に印加される。
以上のように、本実施形態では、冷媒冷却器(81)を用いてスイッチング素子(37)を冷却する空気調和装置(1)において、スイッチングを行わないキャリア周期を設けてスイッチング素子(37)のスイッチング回数を低減した。その結果、本実施形態では、冷媒冷却器(81)から漏れ出る高周波電流を効果的に低減できるとともに、漏れ電流に起因するノイズを低減することができる。
図11は、本実施形態の変形例1に係る空気調和装置の概略構成を示す回路図である。図11に示すように、液管(23)には、膨張弁(13)が設けられている。また、液管(23)には、膨張弁(13)に向かう冷媒の一部を分岐させる分岐回路(26)が接続されている。この分岐回路(26)には、スイッチング素子(37)を冷却するための冷媒冷却器(81)が設けられている。さらに、分岐回路(26)における冷媒冷却器(81)の両端側には、冷媒冷却器(81)の温度コントロールを行うための膨張弁(13a)がそれぞれ接続されている。
前記モータ端子電圧の基本波成分への高調波重畳とは異なる方法で、スイッチング素子(37)のスイッチング回数を減らすことも可能である。図13および図14は、変形例2に係るスイッチングパターンを説明するタイミングチャートであり、(A)、(B)はそれぞれ、正弦波駆動時のU相、V相の相電圧波形であり、(C)はインバータ回路(34)の出力線間電圧(UV相間)である。この変形例では、電力供給装置(30)として三相インバータの相電圧波形を検討する。
変形例3では、IPMモータの特徴に着目した制御の例を説明する。図15は、モータ端子電圧のベクトル図であり、(A)は最大効率制御時のベクトル図であり、(B)は最大効率制御の状態から電流位相を遅らせた場合のベクトル図である。なお、駆動モータ(18)の巻線抵抗成分Rは小さいと仮定して同図ではRの項を表記していない。
I=√(Id^2+Iq^2) (Id=-Isinβ、Iq=Icosβ)
ここで、上式のパラメータはそれぞれ、V:モータ端子電圧、Vd:d軸電圧、Vq:q軸電圧、I:モータ電流、Id:d軸電流、Iq:q軸電流、R:モータ巻線抵抗、Ld:モータd軸インダクタンス、Lq:モータq軸インダクタンス、Φ:モータ磁束差交数、ω:回転速度、β:電流位相である。
なお、本実施形態では、本発明に係る冷凍装置の一例として空気調和装置(1)について説明したが、本発明に係る冷凍装置はこれに限定するものではない。例えば、冷蔵庫内や冷凍庫内を冷却する冷凍装置であってもよい。
10 冷媒回路
11 圧縮機
12 熱源側熱交換器
13 膨張弁(膨張機構)
14 利用側熱交換器
18 駆動モータ
37 スイッチング素子
60 制御装置(制御手段)
81 冷媒冷却器
Claims (5)
- 圧縮機(11)と、熱源側熱交換器(12)と、膨張機構(13)と、及び利用側熱交換器(14)とが接続されて冷凍サイクルを行う冷媒回路(10)を備えた冷凍装置であって、
入力電圧を所定の周波数及び電圧値の交流電圧に変換する複数のスイッチング素子(37)を備えたパワーモジュール(61)と、
前記圧縮機(11)を駆動する駆動モータ(18)と、
前記パワーモジュール(61)に直流リンク電圧(vdc)を供給する整流回路(32)と、
前記冷媒回路(10)における冷媒を内部に流通して前記パワーモジュール(61)を冷却する冷媒冷却器(81)と、
前記各スイッチング素子(37)を駆動制御して、スイッチングを行わないキャリア周期(T)が存在する制御を行う制御手段(60)とを備えたことを特徴とする冷凍装置。 - 請求項1において、
前記制御手段(60)は、モータ端子電圧の基本波のピーク及びボトムの近傍では振幅が直流リンク電圧(vdc)になるように増加し、その他の部分では振幅が減少するような高調波が重畳された波形に制御して、前記基本波の大きさは保ちながら前記スイッチングを行わないキャリア周期(T)が正弦波駆動時よりも増加する制御を行うことを特徴とする冷凍装置。 - 請求項1において、
前記制御手段(60)は、前記スイッチング素子(37)の通電区間を180度よりも短くすることで、通電時の電圧を増加させて前記スイッチングを行わないキャリア周期(T)が存在する制御を行うことを特徴とする冷凍装置。 - 請求項1において、
前記駆動モータ(18)は、IPMモータであり、
前記制御手段(60)は、前記駆動モータに印加する電圧位相又は電流位相を制御して同じ運転状態における前記モータ端子電圧を調整することを特徴とする冷凍装置。 - 請求項1において、
前記制御手段(60)は、前記モータ端子電圧の目標値が前記直流リンク電圧(vdc)を超えた場合には、前記スイッチングを行わないことを特徴とする冷凍装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2011249393A AU2011249393B2 (en) | 2010-05-06 | 2011-04-28 | Refrigeration apparatus |
EP11777385.3A EP2568597B1 (en) | 2010-05-06 | 2011-04-28 | Refrigerating apparatus |
US13/643,134 US9276516B2 (en) | 2010-05-06 | 2011-04-28 | Refrigeration apparatus |
CN201180019066.XA CN102844980B (zh) | 2010-05-06 | 2011-04-28 | 制冷装置 |
BR112012027710-3A BR112012027710B1 (pt) | 2010-05-06 | 2011-04-28 | Aparelho de refrigeração |
KR1020127028260A KR101419633B1 (ko) | 2010-05-06 | 2011-04-28 | 냉동장치 |
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EP (1) | EP2568597B1 (ja) |
JP (1) | JP5308474B2 (ja) |
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CN (1) | CN102844980B (ja) |
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AU2011249393B2 (en) | 2014-04-03 |
CN102844980A (zh) | 2012-12-26 |
JP5308474B2 (ja) | 2013-10-09 |
EP2568597B1 (en) | 2020-04-15 |
AU2011249393A1 (en) | 2012-11-15 |
US20130036759A1 (en) | 2013-02-14 |
BR112012027710A2 (pt) | 2017-12-12 |
EP2568597A4 (en) | 2017-05-31 |
KR101419633B1 (ko) | 2014-07-15 |
EP2568597A1 (en) | 2013-03-13 |
US9276516B2 (en) | 2016-03-01 |
JP2011252697A (ja) | 2011-12-15 |
KR20130004348A (ko) | 2013-01-09 |
BR112012027710B1 (pt) | 2020-03-10 |
CN102844980B (zh) | 2016-01-20 |
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