CN110679051A - Compressor drive device, control unit using the same, compressor unit, and cooler - Google Patents
Compressor drive device, control unit using the same, compressor unit, and cooler Download PDFInfo
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- CN110679051A CN110679051A CN201880034611.4A CN201880034611A CN110679051A CN 110679051 A CN110679051 A CN 110679051A CN 201880034611 A CN201880034611 A CN 201880034611A CN 110679051 A CN110679051 A CN 110679051A
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- compressor
- power supply
- circuit
- compressor driving
- control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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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
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Multiple Motors (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The compressor drive device 2 is provided with: a compressor drive circuit 9 for driving the compressor, and a power supply circuit 8 for driving the compressor for supplying power from the ac power supply 1 to the compressor drive circuit; a control circuit 11 for controlling the compressor driving circuit; a control power supply circuit 10 for supplying power from an ac power supply to the control circuit; and an electromagnetic switch 7 that, when an overvoltage occurs in the ac power supply, does not electrically disconnect the ac power supply from the control power supply circuit, and disconnects the ac power supply from the compressor drive power supply circuit.
Description
Technical Field
The present invention relates to a compressor driving device, a control unit including the same, a compressor unit, and a cooler such as a refrigerator and an air conditioner.
Background
Generally, this type of compressor driving device is driven by alternating current as a power source. When the voltage of the AC power supply fluctuates, an overvoltage may be applied to a configuration circuit of the compressor driving device. Therefore, a protection device that protects an inverter circuit (e.g., a configuration circuit) from an overvoltage is known (see PTL 1, for example).
Fig. 5 shows a conventional inverter described in PTL 1. The protection device for the inverter circuit drives the motor 43 via the inverter circuit 42 by the three-phase AC power source 40. An electromagnetic switch 41 is provided between the three-phase AC power source 40 and the inverter circuit 42 as a protection device that protects the inverter circuit 42 from overvoltage.
The inverter circuit 42 includes a rectifier 44 that rectifies three-phase alternating current into direct current, a resistor 45 that smoothes the direct current, a smoothing capacitor 46, an inverter device 47 that converts the direct current into three-phase alternating current, and a control circuit 48 that controls the inverter device 47.
The control circuit 48 detects overvoltage in the three-phase AC power source 40 through voltage dividing resistors 50, 51 provided in the inverter circuit 42. When the overvoltage is detected, the control circuit 48 opens the electromagnetic switch 41 to block the connection between the inverter circuit 42 and the AC power source 40. This prevents an overvoltage from being applied to the inverter circuit 42.
This configuration can prevent overvoltage from being applied to the inverter circuit 42 even when the voltage of the ac power supply fluctuates. This can prevent damage to the electronic components forming the inverter circuit 42 (e.g., elements forming the smoothing capacitor 46 and the inverter device 47). This improves the reliability of the inverter circuit 42.
Reference list
Patent document
PTL 1：JP S60-190121A
Disclosure of Invention
Technical problem
In the above-described conventional configuration, the electromagnetic switch 41 is provided between the three-phase AC power source 40 and the inverter circuit 42. When the voltage fluctuations of the power supply cause an overvoltage condition, the entire inverter circuit 42 (including the smoothing capacitor 46, the inverter device 47, and the control circuit 48) and the motor 43 are blocked from the AC power supply 40.
When the motor 43 is stopped, the operation of the entire inverter circuit 42 is stopped. Therefore, the cause of the stop of the motor 43 cannot be identified.
The electromagnetic switch 41 mechanically cuts off the power supply, causing a slight delay (about several tens of milliseconds) in the opening operation of the electromagnetic switch 41 in response to the opening signal from the control circuit 48. Therefore, during the delay of the operation, the overvoltage is applied to the inverter circuit 42. The repeated application of an overvoltage due to the delay of the opening operation of the electromagnetic switch 41 for only several tens of milliseconds will damage the electronic components configuring the inverter circuit 42. This accumulation of damage will reduce the reliability and life of the inverter circuit.
The more times the electromagnetic switch 41 is opened and closed, the greater the cumulative effect of the overvoltage applied in several tens of milliseconds will be. The durability of the electronic components configuring the inverter circuit 42 is reduced, reducing the reliability and the service life of the inverter circuit 42.
When the inverter circuit is used in a country or region where voltage fluctuation is frequent, the influence of the voltage fluctuation on the inverter circuit is large.
When the apparatus including the inverter circuit is, for example, a refrigerator, the apparatus is continuously energized for use throughout the year. In this case, the electromagnetic switch 41 is frequently opened and closed due to the overvoltage, so that the influence of the overvoltage becomes considerable. This significantly affects the reliability and lifetime of the device.
The present invention has been achieved in light of the above. An object of the present invention is to provide a compressor driving device that reduces application of an overvoltage to a configuration circuit and determines a cause of a stop of a compressor, a control unit including the compressor driving device, a compressor unit, and a cooler.
Solution to the problem
In order to achieve the above object, a compressor driving device includes a compressor driving circuit that drives a compressor, a power supply circuit for compressor driving that supplies power from an AC power supply to the compressor driving circuit, a control circuit that controls the compressor driving circuit, a control power supply circuit that supplies power from the AC power supply to the control circuit, and an electromagnetic switch that blocks a power supply connection between the AC power supply and the compressor without blocking an electrical connection between the AC power supply and the control power supply circuit when an overvoltage is generated in the AC power supply.
Advantageous effects of the invention
The invention provides a compressor driving device, a control unit including the same, a compressor unit and a cooler.
Drawings
Fig. 1 is a block diagram showing a circuit configuration of a compressor driving device according to embodiment 1 of the present invention.
Fig. 2 is a schematic explanatory view of a compressor unit according to embodiment 2 of the present invention.
Fig. 3 is an explanatory view of a refrigerator of embodiment 3 of the present invention.
Fig. 4 is an explanatory view of a refrigerator of embodiment 4 of the present invention.
Fig. 5 is a circuit diagram of a conventional compressor driving device.
Detailed Description
The compressor driving device according to the first invention includes a compressor driving circuit that drives the compressor, a power supply circuit for compressor driving that supplies power from the AC power source to the compressor driving circuit, a control circuit that controls the compressor driving circuit, a control power supply circuit that supplies power from the AC power source to the control circuit, and an electromagnetic switch that blocks an electrical connection between the AC power source and the power supply circuit for compressor driving, but does not block an electrical connection between the AC power source and the control power supply circuit, when an overvoltage is generated in the AC power source. When the voltage fluctuation of the AC power supply is an overvoltage, the electromagnetic switch is operated to block the power supply to the power supply circuit for the compressor drive. Thereby, it is possible to prevent overvoltage from being applied to a configuration circuit such as a power supply circuit for compressor driving. At the same time, power continues to be supplied to the control power supply circuit to maintain operation of the control circuit. Thus, the control circuit can determine the cause of the compressor stop.
In the compressor driving device according to the second invention, when the compressor is not driven in the first invention, the electromagnetic switch may be opened to block the electrical connection between the AC power source and the power circuit for the compressor driving.
Therefore, even when the AC power source is in an overvoltage state while the compressor is not driven, the electromagnetic switch has been turned off. This eliminates the need to open the electromagnetic switch every time an overvoltage occurs when the compressor is stopped. It is possible to significantly reduce the application of an overvoltage to a configuration circuit such as a power supply circuit for compressor driving due to the turn-off delay of the electromagnetic switch. Therefore, damage to elements forming a power supply circuit or the like for compressor driving caused by application of an overvoltage can be reduced, and reliability and life of the compressor driving device and an apparatus such as a refrigerator including the compressor driving device can be improved. In addition, since the driving of the electromagnetic switch can be stopped during the stop of the compressor, power consumption for driving the electromagnetic switch can be suppressed, and energy saving performance can be improved.
In the compressor driving device according to the third invention, in the first invention or the second invention, the control power supply circuit includes a rectifier diode for half-wave rectification, and the electromagnetic switch is a contact that opens and closes one of a pair of wires connected to the AC power supply. The rectifier diode may be connected to one wire.
When the electromagnetic switch is turned off to block the power supply circuit for compressor driving and the like from the AC power supply, it is possible to prevent power supply to the power supply circuit for compressor driving and the like via the control power supply circuit. In other words, in the non-insulated circuit configuration in which the power supply circuit for compressor driving and the control power supply circuit are separated, it is possible to prevent power from being supplied to the power supply circuit for compressor driving and the like via the control power supply circuit. Therefore, it is possible to provide at low cost a compressor driving device having a power supply circuit for compressor driving and a control power supply circuit having a non-insulated circuit configuration.
In the compressor driving device according to a fourth invention, in the second invention or the third invention, the power supply circuit for compressor driving includes a smoothing capacitor, and the electromagnetic switch may be closed at each predetermined timing for a predetermined time when the compressor is not driven. This can maintain the charging of the smoothing capacitor of the power supply circuit for driving the compressor connected to the downstream side of the electromagnetic switch. Therefore, when the electromagnetic switch is turned off during the stop of the compressor, the charge of the smoothing capacitor of the power supply circuit for the compressor drive can be prevented from being discharged to nearly zero. When the electromagnetic switch is closed to drive the compressor, a large impact current is thus prevented from flowing through the electromagnetic switch. Therefore, damage of the electromagnetic switch caused by a large impact current can be significantly reduced, and reliability and service life of the compressor driving device can be further improved.
According to the compressor driving device of the fifth invention, in any one of the first to fourth inventions, it is possible to further include a discharge diode arranged so that a current flows from the positive side terminal of the power supply circuit for compressor driving to the positive side terminal of the control power supply circuit. This can quickly reduce the residual charge of the smoothing capacitor of the power circuit for the compressor drive when the AC power is turned off. Accordingly, defects due to residual charges can be prevented, and the safety of the compressor driving device can be improved.
A control unit according to a sixth invention includes the compressor driving device of any one of the first to fifth inventions and a control box that accommodates the compressor driving device. Thus, the compressor driving device is protected by the control box, and damage from external force and the like can be prevented. Therefore, the compressor driving device is easy to operate and use when attached to a component such as a compressor, and has higher convenience.
The compressor unit according to the seventh invention is constructed integrally with the compressor and the control unit of the sixth invention. Therefore, it is possible to provide a compressor unit having a compressor drive control circuit that can be easily mounted on various coolers.
A cooler according to an eighth invention includes the compressor driving device of any one of the first to fifth inventions, the control unit of the sixth invention, or the compressor unit of the seventh invention. Therefore, a cooler manufacturer does not need to design a complicated compressor driving circuit, and can easily provide a cooler.
Embodiments of the present invention will now be described with reference to the accompanying drawings. The present invention is not limited by these examples.
(example 1)
Fig. 1 is a block diagram showing a circuit configuration of a compressor driving device according to embodiment 1 of the present invention.
In fig. 1, reference numeral 1 denotes an AC power supply. Reference numeral 2 denotes a compressor driving device connected to the AC power supply 1 via a connector 3. Reference numeral 4 denotes a motor of the compressor driven by the compressor driving device 2. Hereinafter, a side close to the AC power supply 1 may be referred to as an upstream side, and a side far from the AC power supply 1 may be referred to as a downstream side.
In the present embodiment, the compressor driving device 2 is configured by the following circuit elements integrally provided on one printed circuit board. Hereinafter, this configuration will be described. The circuit elements are electrically connected to each other through wiring on the circuit board.
The electromagnetic switch 7 is closed to connect the wiring between the AC power supply 1 and the power supply circuit 8 for compressor driving, and the electromagnetic switch 7 is opened to cut off (block) the connection. When an overvoltage is applied, the electromagnetic switch 7 cuts off the electrical connection between the AC power supply 1 and the power supply circuit 8 for compressor driving. The overvoltage is, for example, a voltage equal to or higher than a rated voltage of the compressor driving device 2, and may damage components of the compressor driving device 2.
The control circuit 11 controls the driving of the compressor drive circuit 9. Further, when an overvoltage of the AC power supply 1 is detected, the control circuit 11 turns off the electromagnetic switch 7 to block current input (power supply) from the AC power supply 1 to the power supply circuit 8 for compressor drive, the compressor drive circuit 9, and the motor 4.
Further, when the compressor does not need to be driven or not driven, the control circuit 11 performs control to turn off the electromagnetic switch 7. When the compressor is not driven, the control circuit 11 performs control to close the electromagnetic switch 7 at a predetermined time interval (at a predetermined timing) and then repeatedly open the electromagnetic switch 7 after a predetermined time elapses. However, when the electromagnetic switch 7 is opened due to an overvoltage, the control circuit 11 does not perform control to close the electromagnetic switch 7.
"when it is not necessary to drive the compressor", as described above, means "when a specific condition with respect to the compressor is satisfied". This refers to, for example, a case where the cooler including the compressor driving device 2 is a refrigerator and the temperature of the storage chamber of the refrigerator has reached a predetermined temperature and cooling is no longer required. In this case, the motor 4 of the compressor is not driven but stopped.
Here, the control power supply circuit 10 is branched from the wiring on the upstream side of the electromagnetic switch 7 (i.e., between the alternating-current power supply 1 and the electromagnetic switch 7). Therefore, regardless of whether the electromagnetic switch 7 is open or closed, electric power is always supplied from the AC power supply 1 to the control power supply circuit 10. In other words, the electromagnetic switch 7 controls the supply of electric power to the power supply circuit 8 for compressor driving, and does not control the supply of electric power to the control power supply circuit 10. The electromagnetic switch 7 is provided as a contact that opens and closes only one wire (one wire) of a pair of wires (wires) connected to the AC power source 1.
Further, the power supply circuit 8 for compressor driving includes a full-wave rectification circuit 12 and a smoothing condenser 13. The full-wave rectifier circuit 12 rectifies the ac supplied via the noise filter 6 into dc. The smoothing capacitor 13 smoothes the direct current full-wave rectified by the full-wave rectifying circuit 12. The compressor drive circuit 9 is configured as a switching circuit including a semiconductor element or the like.
The control power supply circuit 10 further includes a half-wave rectifier circuit section 16, a voltage divider circuit section 17, a first power supply section 19, a second power supply section 21, and a third power supply section 22. The half-wave rectification circuit section 16 includes a rectifying diode 14 for half-wave rectification and a capacitor 15. The voltage divider circuit 17 detects an overvoltage. The first power supply unit 19 drives the microcomputer 18 of the control circuit 11. The second power supply unit 21 drives the drive control unit 20 of the compressor drive circuit 9. The third power supply section 22 drives the electromagnetic switch 7.
The compressor drive circuit 9 and the drive control section 20 are integrally configured by a semiconductor element such as an Intelligent Power Module (IPM) 25.
The rectifier diode 14 of the half-wave rectifier circuit portion 16 is connected to one line provided with the electromagnetic switch 7. The rectifier diode 14 is arranged in parallel with the electromagnetic switch 7 and the full-wave rectifier circuit 12 of the power supply circuit 8 for compressor driving.
Further, a discharge diode 23 is arranged between the power supply circuit 8 for compressor driving and the control power supply circuit 10 so that a current flows only from the positive side terminal of the power supply circuit 8 for compressor driving to the positive side terminal of the control power supply circuit 10.
The operation and action of the compressor driving device 2 constructed as described above will now be described.
Normally, the electromagnetic switch 7 is closed. Thereby, power is supplied from the AC power supply 1 to the power supply circuit 8 for driving the compressor, the compressor drive circuit 9, the motor 4, the control power supply circuit 10, and the control circuit 11.
The driving of the motor 4 is controlled by the compressor driving circuit 9 in accordance with a signal from the control circuit 11.
In this state, when the voltage fluctuation of the AC power supply 1 is an overvoltage, the control circuit 11 detects the overvoltage via the voltage dividing circuit portion 17 of the control power supply circuit 10. The control circuit 11 then drives the electromagnetic switch 7 via the third power supply section 22, and turns off the electromagnetic switch 7 to block the AC power supply 1 from the power supply circuit 8 for compressor driving. As a result, overvoltage is prevented from being applied to the power supply circuit 8 for compressor driving, the compressor driving circuit 9, and the motor 4. Therefore, damage to the elements and the like of each circuit due to application of overvoltage is prevented.
Here, the control power supply circuit 10 is branched from the wiring on the upstream side of the electromagnetic switch 7 (i.e., between the AC power supply 1 and the electromagnetic switch 7). Therefore, the electromagnetic switch 7 stops supplying power to the circuit element located on the power supply circuit 8 side for driving the compressor with respect to the electromagnetic switch 7, and stops supplying power to the motor 4 of the compressor. Therefore, the supply of electric power to the circuit element on the control power supply circuit 10 side with respect to the electromagnetic switch 7 is not interrupted. Therefore, the control circuit 11 continues to be energized after the electromagnetic switch 7 is turned off. Therefore, when the compressor is stopped due to the overvoltage, the control circuit 11 determines the overvoltage as the cause of the compressor stop, for example, and may indicate the cause. Convenience is thus significantly enhanced.
The withstand voltage of the power supply circuit 10, the rectifier diode 14, and the capacitor 15 is a voltage sufficiently higher than the overvoltage of the AC power supply 1. Smoothing capacitor 13 has a higher current consumption value and a much larger capacitance than capacitor 15. Therefore, the smoothing capacitor 13 having a higher withstand voltage rating will result in a larger size and higher cost. However, the capacitor 15 has relatively low current consumption in the downstream circuit elements, and has a small capacitance. Therefore, it is relatively easy to select a capacitor having a high withstand voltage rating for the capacitor 15.
Further, in the compressor driving device 2 of the present embodiment, when the motor 4 of the compressor is not driven, the electromagnetic switch 7 is opened to block the connection of the power supply circuit 8 for compressor driving to the AC power supply 1. For example, when the compressor driving device 2 is used for a refrigerator and the temperature of the freezing compartment is sufficiently low, it is not necessary to drive the compressor, and the motor 4 of the compressor is stopped. At this time, the control power supply circuit 10 performs control to turn off the electromagnetic switch 7, and the connection between the motor 4 and the AC power supply 1 is blocked.
Therefore, when the compressor is not driven and the voltage of the AC power supply 1 fluctuates to an overvoltage, since the electromagnetic switch 7 has been turned off, the overvoltage is prevented from being applied to the circuit elements on the downstream side of the electromagnetic switch 7. The electromagnetic switch 7 therefore does not need to be opened every time an overvoltage occurs during the compressor stop.
Therefore, it is possible to significantly reduce the application of overvoltage to circuit elements such as the power supply circuit 8 for compressor driving due to the off delay of the electromagnetic switch 7.
This can reduce accumulation of damage due to application of an overvoltage to elements forming the power supply circuit 8 and the like for compressor driving in the compressor driving device 2. Therefore, the reliability and the service life of the compressor driving device 2 and the apparatus such as the refrigerator including the compressor driving device can be significantly improved.
Further, the driving of the electromagnetic switch 7 may be stopped during the stop of the compressor. Therefore, power consumption for driving the electromagnetic switch 7 can be suppressed, and energy saving performance can also be improved.
When the compressor is not required to be driven and the electromagnetic switch 7 is turned off, the smoothing capacitor 13 of the power supply circuit 8 for compressor driving is slowly discharged, and the charge of the smoothing capacitor 13 becomes zero or close to zero. Then, in a case where the charge of the smoothing capacitor 13 becomes close to zero, when the opened electromagnetic switch 7 is closed, a large rush current flows through the electromagnetic switch 7, and the electromagnetic switch 7 may be significantly damaged.
However, in the compressor driving device 2 of the present embodiment, when the compressor is stopped, the electromagnetic switch 7 is closed for a predetermined time (for example, one second) at every predetermined time interval (for example, 20 minutes) and then opened. The repeated opening and closing of the electromagnetic switch 7 allows the charging of the smoothing capacitor 13 connected to the downstream side of the electromagnetic switch 7 to be maintained at a predetermined amount or more.
In other words, the charge of the smoothing capacitor 13 is not discharged to nearly zero during the compressor stop. When the electromagnetic switch 7 is closed to drive the compressor, a large rush current is thus prevented from flowing through the electromagnetic switch 7. Therefore, damage of the electromagnetic switch 7 caused by a large rush current can be significantly reduced, and the reliability and the service life of the compressor driving device 2 can be further improved.
Note that the time interval and the period when the electromagnetic switch 7 is closed during the stop of the compressor are predetermined, but they are not limited to predetermined values. The time interval and the period of time may be arbitrarily set as long as a predetermined amount of electric charge is accumulated and maintained in the smoothing capacitor 13.
Further, the compressor driving device 2 branches a line near the power supply circuit 8 for compressor driving and a line near the control power supply circuit 10. The control power supply circuit 10 is configured as a half-wave rectifier circuit. The electromagnetic switch 7 is provided to open and close only the contacts of one line of the AC power supply 1. A rectifying diode 14 for controlling half-wave rectification of the power supply circuit 10 is connected to one line of the AC power supply 1 connected to the electromagnetic switch 7.
Therefore, when the electromagnetic switch 7 is turned off to block the connection of the power supply circuit 8 for compressor driving and the like to the AC power supply 1, power supply from the AC power supply 1 to the power supply circuit 8 for compressor driving and the like via the control power supply circuit 10 is prevented. In other words, in the non-insulated circuit configuration in which the power supply circuit 8 for compressor driving and the control power supply circuit 10 are separated, it is possible to prevent power from being supplied to the power supply circuit 8 for compressor driving and the like via the control power supply circuit 10.
Therefore, the power supply circuit 8 and the control power supply circuit 10 for compressor driving having a non-insulated circuit configuration can be provided at low cost.
The circuit parts for driving the compressor (i.e., the power supply circuit 8 for compressor driving, the compressor driving circuit 9, the control power supply circuit 10, the control circuit 11, and the electromagnetic switch 7) can be easily provided integrally on one printed circuit board.
Further, in the compressor driving device 2 of the present embodiment, the discharge diode 23 is provided so that the current flows only from the positive side terminal of the power supply circuit 8 for compressor driving to the positive side terminal of the control power supply circuit 10.
This enables the residual charge of the smoothing capacitor 13 of the power supply circuit 8 for compressor driving to be reduced quickly via the control power supply circuit 10, for example, in the case where the AC power supply 1 is disconnected for maintenance. Therefore, the safety of the compressor driving device 2 can be improved.
(example 2)
Fig. 2 is a schematic explanatory diagram of a compressor unit 28 including the compressor driving device 2 according to embodiment 1.
The compressor unit 28 of embodiment 2 includes the compressor 24. An attachment leg (not shown) for the control unit 27 is attached to a bracket (not shown) welded to the outside of the compressor 24. The compressor unit 28 thus comprises an integrated compressor 24 and control unit 27. The control unit 27 includes a control box 26, and the compressor drive device 2 is built in the control box 26.
The above integration means a combined arrangement of the compressor 24 and the control unit 27, i.e. the compressor drive 2. Therefore, the compressor unit 28 is integrally configured by the compressor 24 and the control unit 27.
The above-described configuration may provide the compressor unit 28 with a compressor control circuit that may be used for general purposes. That is, it is possible to provide the compressor unit 28 that can be easily mounted on various coolers.
The compressor unit 28 also comprises a compressor drive 2. Therefore, in the compressor unit 28, it is possible to reduce the application of overvoltage to the configuration circuit such as the power supply circuit 8 for compressor driving of the compressor driving device 2, and to determine the cause of the compressor stop.
(example 3)
Fig. 3 is an explanatory diagram of a refrigerator including the compressor unit 28 according to embodiment 2. As shown in fig. 3, the refrigerator according to embodiment 3 includes a refrigerator main body 29. A main body control unit 30 is provided on the back surface of the refrigerator main body 29, and a compressor unit 28 is provided in a machine room in the lower part of the refrigerator main body 29. The microcomputer 18 (fig. 1) of the control circuit 11 of the compressor driving device 2 of the compressor unit 28 is connected to a main body control section 30 of the refrigerator main body 29 via a lead wire 31.
The refrigerator configured as above can be easily configured such that the control unit 27 (i.e., the compressor driving device 2) is mounted in the refrigerator main body 29 later, and the control circuit 11 of the compressor driving device 2 is connected to the main body control section 30. Therefore, a refrigerator manufacturer does not need to design a complicated compressor driving circuit like a compressor driving control circuit (e.g., an inverter control circuit), and can easily manufacture a refrigerator having an inverter driving controllable compressor driving device.
(example 4)
Fig. 4 is an explanatory view showing another refrigerator to which the compressor-driving device 2 of embodiment 1 is directly mounted.
As shown in fig. 4, the refrigerator according to embodiment 4 includes a refrigerator main body 29. The compressor driving device 2 is provided as a printed circuit board at an upper portion of a rear surface of the refrigerator main body 29. The compressor driving device 2 is provided in the vicinity of the main body control unit 30, and is connected to the main body control unit 30 via a lead wire 31. The compressor 24 is disposed at a lower portion of the refrigerator main body 29 and is connected to the compressor driving device 2 via a lead wire 31. In this configuration, the refrigerator according to embodiment 4 has similar effects to the refrigerator according to embodiment 3. Further, the refrigerator according to embodiment 4 is expected to have the effects described below.
For example, when the refrigerator is used in an area or a country where flooding frequently occurs due to flooding (i.e., a country located in a tropical region), water is better prevented from entering the compressor driving device 2. The compressor driving device 2 can be prevented from malfunctioning due to water. In addition, the influence of heat from the compressor 24 on the compressor driving device 2 can be reduced regardless of the region in which the refrigerator is used, and the reliability of the compressor driving device 2 can be prevented from being lowered.
In embodiment 4, the compressor driving device 2 is directly mounted on the refrigerator main body 29 in the vicinity of the main body control section 30. Alternatively, the compressor driving device 2 may be configured similarly to the control unit 27 according to embodiment 2 and attached to the refrigerator main body 29. The position where the compressor driving device 2 is mounted on the refrigerator main body 29 is not limited to the vicinity of the main body control part 30.
In embodiments 3 and 4, the refrigerator is described as a cooler, but is not limited to a cooler. For example, the cooler may be an air conditioner, a vending machine, a display case, or a commercial refrigerator. Any cooler including a compressor provides a similar effect.
Although the compressor driving device, the control unit including the compressor driving device, the compressor unit, and the cooler according to the present invention have been described using the embodiments, the present invention is not limited to the embodiments. The embodiments disclosed herein are illustrative and not restrictive. The scope of the present invention is indicated by the scope of the claims, and includes the meaning equivalent to the scope of the claims and any modifications within the scope of the claims.
Industrial applicability
As described above, the present invention provides a compressor driving device capable of reducing application of an overvoltage to a configuration circuit of the compressor driving device and determining a cause of a stop of the compressor, a control unit including the compressor driving device, the compressor unit, and a cooler. Therefore, the present invention can be widely used as a compressor driving apparatus for a refrigerator, an air conditioner, a vending machine, and another cooler including a compressor.
List of reference numerals
1 AC power supply
2 compressor driving device
3 connector
4 electric motor
6 noise filter
7 electromagnetic switch
8 Power supply circuit for compressor drive
9 compressor driving circuit
10 control power supply circuit
11 control circuit
12 full wave rectifying circuit
13 smoothing capacitor
14 rectifier diode
15 capacitor
16-half wave rectifier circuit section
17 voltage division circuit part
18 micro-computer
19 first power supply part
20 drive control part
21 second power supply unit
22 third power supply part
23 discharge diode
24 compressor
25 IPM
26 control unit
27 control circuit
28 compressor unit
29 refrigerator main body
30 main body control part
31 wire
Claims (8)
1. A compressor drive device comprising:
a compressor driving circuit for driving the compressor;
a power circuit for compressor driving, which supplies power from an alternating current power source to the compressor driving circuit;
a control circuit for controlling the compressor driving circuit;
a control power supply circuit that supplies power from the alternating-current power supply to the control circuit; and
an electromagnetic switch that blocks electrical connection between the alternating-current power supply and the power supply circuit for compressor driving, but does not block electrical connection between the alternating-current power supply and the control power supply circuit, when an overvoltage is generated in the alternating-current power supply.
2. The compressor driving device according to claim 1, wherein the electromagnetic switch is opened to block an electrical connection between the alternating-current power source and the power circuit for compressor driving when the compressor is not driven.
3. The compressor driving device according to claim 1 or 2, wherein the control power supply circuit includes a rectifier diode for half-wave rectification,
the electromagnetic switch is a contact that opens and closes one of a pair of wires connected to the alternating current power supply, and
the rectifier diode is connected to the one wire.
4. The compressor driving device according to claim 2 or 3, wherein the power supply circuit for compressor driving includes a smoothing capacitor, and
the electromagnetic switch is closed at each predetermined timing for a predetermined time when the compressor is not driven.
5. The compressor driving device according to any one of claims 1 to 4, further comprising a discharge diode provided so that a current flows from a positive side terminal of the power supply circuit for compressor driving to a positive side terminal of the control power supply circuit.
6. A control unit, comprising:
the compressor driving device according to any one of claims 1 to 5; and
and a control box with the built-in compressor driving device.
7. A compressor unit configured integrally with the compressor by the control unit of claim 6.
8. A cooler, comprising:
the compressor driving device according to any one of claims 1 to 5;
the control unit of claim 6; or
The compressor unit of claim 7.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017103965 | 2017-05-25 | ||
| JP2017-103965 | 2017-05-25 | ||
| PCT/JP2018/019494 WO2018216655A1 (en) | 2017-05-25 | 2018-05-21 | Compressor driving device, control unit using same, compressor unit, and cooler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110679051A true CN110679051A (en) | 2020-01-10 |
| CN110679051B CN110679051B (en) | 2023-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880034611.4A Active CN110679051B (en) | 2017-05-25 | 2018-05-21 | Compressor driving device, control unit using the same, compressor unit, and cooler |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN110679051B (en) |
| PH (1) | PH12019502399A1 (en) |
| WO (1) | WO2018216655A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2018216655A1 (en) | 2018-11-29 |
| PH12019502399A1 (en) | 2020-12-07 |
| CN110679051B (en) | 2023-06-09 |
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