US20090110562A1 - Variable frequency control module for an AC compressor in an air conditioning system - Google Patents

Variable frequency control module for an AC compressor in an air conditioning system Download PDF

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Publication number
US20090110562A1
US20090110562A1 US12/157,851 US15785108A US2009110562A1 US 20090110562 A1 US20090110562 A1 US 20090110562A1 US 15785108 A US15785108 A US 15785108A US 2009110562 A1 US2009110562 A1 US 2009110562A1
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United States
Prior art keywords
signal
unit
compressor
control module
variable frequency
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Abandoned
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US12/157,851
Inventor
Hsiao-Feng Huang
Yi-Jhu Chan
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YAN YANG HIGH Tech Co Ltd
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YAN YANG HIGH Tech Co Ltd
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Application filed by YAN YANG HIGH Tech Co Ltd filed Critical YAN YANG HIGH Tech Co Ltd
Assigned to YAN YANG HIGH TECHNOLOGY CO., LTD. reassignment YAN YANG HIGH TECHNOLOGY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHAN, YI-JHU, HUANG, HSIAO-FENG
Publication of US20090110562A1 publication Critical patent/US20090110562A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1201—Rotational speed of the axis
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/10—Inlet temperature
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/11—Outlet temperature

Definitions

  • the invention relates to a variable frequency control module, more particularly to a variable frequency control module for an AC compressor in an air conditioning system.
  • a conventional air conditioner 1 is shown to include a temperature detector 12 for detecting ambient temperature, an operating unit 13 operable so as to set a target temperature, and a processor 11 coupled to the temperature detector 12 and the operating unit 13 for controlling a rotary speed of a compressor 14 based on the ambient temperature detected by the temperature detector 12 and the target temperature set by the operating unit 13 .
  • the processor 11 activates the compressor 14 to operate at a constant rotary speed until the ambient temperature detected by the temperature detector 12 decreases to a first temperature lower than the target temperature
  • the processor 11 deactivates the compressor 14 until the ambient temperature detected by the temperature detector 12 rises to a second temperature higher than the target temperature.
  • a conventional variable frequency air conditioner wherein a DC compressor is controlled by a frequency converter using voltage-controlled modulation such that a rotary speed of the DC compressor changes with variation of a duty cycle of a voltage signal supplied to the DC compressor.
  • a frequency converter cannot be applied to an AC compressor suitable for high-power output.
  • an object of the present invention is to provide a variable frequency control module for an AC compressor in an air conditioning system that can overcome the aforesaid drawbacks of the prior art.
  • variable frequency control module for controlling an AC compressor in an air conditioning system.
  • the variable frequency control module comprises:
  • an operating unit operable so as to output an input signal corresponding to a target temperature
  • FIG. 2 is a schematic circuit block diagram illustrating the first preferred embodiment of a variable frequency control module for an AC compressor in an air conditioning system according to the present invention.
  • FIG. 3 is a schematic circuit block diagram illustrating the second preferred embodiment of a variable frequency control module for an AC compressor in an air conditioning system according to the present invention.
  • variable frequency control module 2 for controlling an AC compressor 15 , such as a three-phase AC compressor, in an air conditioning system according to the present invention is shown to include a temperature detecting unit 21 , an operating unit 22 , a processing unit 23 , an encoding unit 24 , a frequency converting unit 25 , and a display unit 26 .
  • the processing unit 23 is coupled to the temperature detecting unit 21 and the operating unit 22 for receiving the detecting signal and the input signal therefrom, and outputs a control signal corresponding to a difference between the ambient temperature and the target temperature based on the detecting signal and the input signal.
  • the frequency converting unit 25 is coupled to the encoding unit 24 for receiving the encoded signal therefrom, generates a driving signal having a frequency corresponding to the encoded signal from the encoding unit 24 , and is adapted to output the driving signal to the AC compressor 15 so that the AC compressor 15 is operated at a rotary speed based on the driving signal from the frequency converting unit 25 .
  • the processing unit 23 can be configured by a software program so that the rotary speed of the AC compressor 15 is graded with the difference between the ambient temperature and the target temperature. For example, when the difference between the ambient temperature and the target temperature is greater than 10° C., the rotary speed of the AC compressor 15 is controlled at a first rotary speed (S 1 ). When the difference between the ambient temperature and the target temperature ranges from 8° C. to 10° C., the rotary speed of the AC compressor 15 is controlled at a second rotary speed (S 2 ). When the difference between the ambient temperature and the target temperature ranges from 6° C. to 8° C., the rotary speed of the AC compressor 15 is controlled at a third rotary speed (S 3 ).
  • the rotary speed of the AC compressor 15 is controlled at a fourth rotary speed (S 4 ).
  • the rotary speed of the AC compressor 15 is controlled at a fifth rotary speed (S 5 ).
  • the rotary speed of the AC compressor 15 is controlled at a sixth rotary speed (S 6 ).
  • the rotary speed of the AC compressor 15 is controlled to be zero, i.e., the AC compressor 15 is deactivated.
  • the AC compressor 15 is deactivated.
  • FIG. 3 illustrates the second preferred embodiment of a variable frequency control module 2 ′ for controlling an AC compressor 15 according to this invention, which is a modification of the first preferred embodiment.
  • the operating unit 22 ′ includes a plurality of used-operated switches 221 .
  • the display unit 26 ′ includes a liquid crystal display panel 261 for displaying the ambient temperature thereon, and a set of indicating lamps 262 for indicating information pertinent to the rotary speed of the AC compressor 15 .
  • variable frequency control module 2 , 2 ′ of the present invention The following are some of the advantages attributed to the variable frequency control module 2 , 2 ′ of the present invention:
  • the rotary speed of the AC compressor 15 is a relatively lowest rotary speed, i.e., the sixth rotary speed (S 6 ) in the aforesaid example, and the difference between the ambient temperature and the target temperature can be constantly maintained within a desired narrow range. Therefore, constant temperature control can be achieved.

Abstract

A variable frequency control module includes a temperature detecting unit outputting a detecting signal corresponding to ambient temperature detected thereby, an operating unit operable so as to output an input signal corresponding to a target temperature, and a processing unit receiving the detecting signal and the input signal from the temperature detecting unit and the operating unit., and outputting a control signal corresponding to a difference between the ambient temperature and the target temperature based on the detecting signal and the input signal. An encoding unit receives the control signal from the processing unit, encodes the control signal into an encoded signal, and outputs the encoded signal to a frequency converting unit that outputs a driving signal having a frequency corresponding to the encoded signal to an AC compressor so that an AC compressor is operated at a rotary speed based on the driving signal.

Description

    CROSS-REFERENCES TO RELATED APPLICATIONS
  • This application claims priority to Taiwanese Application No. 096140366, filed Oct. 26, 2007, the disclosure of which is herein incorporated by reference.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The invention relates to a variable frequency control module, more particularly to a variable frequency control module for an AC compressor in an air conditioning system.
  • 2. Description of the Related Art
  • Referring to FIG. 1, a conventional air conditioner 1 is shown to include a temperature detector 12 for detecting ambient temperature, an operating unit 13 operable so as to set a target temperature, and a processor 11 coupled to the temperature detector 12 and the operating unit 13 for controlling a rotary speed of a compressor 14 based on the ambient temperature detected by the temperature detector 12 and the target temperature set by the operating unit 13. In operation, when the ambient temperature detected by the temperature detector 12 is higher than the target temperature, the processor 11 activates the compressor 14 to operate at a constant rotary speed until the ambient temperature detected by the temperature detector 12 decreases to a first temperature lower than the target temperature Thereafter, the processor 11 deactivates the compressor 14 until the ambient temperature detected by the temperature detector 12 rises to a second temperature higher than the target temperature.
  • In such a configuration, since the ambient temperature varies frequently between the first and second temperatures, a relatively large difference between the first and second temperatures makes a user feel uncomfortable. Furthermore, during transition between deactivation and activation of the compressor 14, the rotary speed of the compressor 14 rapidly increases or decreases, thereby generating noise and resulting in increased power consumption.
  • To overcome discomfort caused by large temperature variation, a conventional variable frequency air conditioner has been proposed, wherein a DC compressor is controlled by a frequency converter using voltage-controlled modulation such that a rotary speed of the DC compressor changes with variation of a duty cycle of a voltage signal supplied to the DC compressor. However, such a frequency converter cannot be applied to an AC compressor suitable for high-power output.
    • SUMMARY OF THE INVENTION
  • Therefore, an object of the present invention is to provide a variable frequency control module for an AC compressor in an air conditioning system that can overcome the aforesaid drawbacks of the prior art.
  • According to the present invention, there is provided a variable frequency control module for controlling an AC compressor in an air conditioning system. The variable frequency control module comprises:
  • a temperature detecting unit adapted for detecting ambient temperature, and outputting a detecting signal corresponding to the ambient temperature detected thereby;
  • an operating unit operable so as to output an input signal corresponding to a target temperature;
  • a processing unit coupled to the temperature detecting unit and the operating unit for receiving the detecting signal and the input signal therefrom, and outputting a control signal corresponding to a difference between the ambient temperature and the target temperature based on the detecting signal and the input signal;
  • an encoding unit coupled to the processing unit for receiving the control signal therefrom, encoding the control signal into an encoded signal, and outputting the encoded signal; and
  • a frequency converting unit coupled to the encoding unit for receiving the encoded signal therefrom, generating a driving signal having a frequency corresponding to the encoded signal from the encoding unit, and adapted to output the driving signal to the AC compressor so that the AC compressor is operated at a rotary speed based on the driving signal from the frequency converting unit.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which:
  • FIG. 1 is a schematic circuit block diagram of a conventional air conditioner;
  • FIG. 2 is a schematic circuit block diagram illustrating the first preferred embodiment of a variable frequency control module for an AC compressor in an air conditioning system according to the present invention; and
  • FIG. 3 is a schematic circuit block diagram illustrating the second preferred embodiment of a variable frequency control module for an AC compressor in an air conditioning system according to the present invention.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Before the present invention is described in greater detail, it should be noted that like elements are denoted by the same reference numerals throughout the disclosure.
  • Referring to FIG. 2, the first preferred embodiment of a variable frequency control module 2 for controlling an AC compressor 15, such as a three-phase AC compressor, in an air conditioning system according to the present invention is shown to include a temperature detecting unit 21, an operating unit 22, a processing unit 23, an encoding unit 24, a frequency converting unit 25, and a display unit 26.
  • The temperature detecting unit 21 is adapted for detecting ambient temperature, and outputs a detecting signal corresponding to the ambient temperature detected thereby.
  • The operating unit 22 is operable so as to output an input signal corresponding to a target temperature.
  • The processing unit 23 is coupled to the temperature detecting unit 21 and the operating unit 22 for receiving the detecting signal and the input signal therefrom, and outputs a control signal corresponding to a difference between the ambient temperature and the target temperature based on the detecting signal and the input signal.
  • The encoding unit 24 is coupled to the processing unit 23 for receiving the control signal therefrom, encodes the control signal into an encoded signal, and outputs the encoded signal. In this embodiment, the encoding unit 24 includes a plurality of switches 241 that are coupled between the processing unit 23 and the frequency converting unit 25 and that are controlled by the control signal from the processing unit 23, thereby generating the encoded signal.
  • The frequency converting unit 25 is coupled to the encoding unit 24 for receiving the encoded signal therefrom, generates a driving signal having a frequency corresponding to the encoded signal from the encoding unit 24, and is adapted to output the driving signal to the AC compressor 15 so that the AC compressor 15 is operated at a rotary speed based on the driving signal from the frequency converting unit 25.
  • The display unit 26 is coupled to the processing unit 23 for displaying the ambient temperature. In this embodiment, the display unit 26 includes a seven-segment display.
  • In this embodiment, the processing unit 23 can be configured by a software program so that the rotary speed of the AC compressor 15 is graded with the difference between the ambient temperature and the target temperature. For example, when the difference between the ambient temperature and the target temperature is greater than 10° C., the rotary speed of the AC compressor 15 is controlled at a first rotary speed (S1). When the difference between the ambient temperature and the target temperature ranges from 8° C. to 10° C., the rotary speed of the AC compressor 15 is controlled at a second rotary speed (S2). When the difference between the ambient temperature and the target temperature ranges from 6° C. to 8° C., the rotary speed of the AC compressor 15 is controlled at a third rotary speed (S3). When the difference between the ambient temperature and the target temperature ranges from 4° C. to 6° C., the rotary speed of the AC compressor 15 is controlled at a fourth rotary speed (S4). When the difference between the ambient temperature and the target temperature ranges from 2° C. to 4° C., the rotary speed of the AC compressor 15 is controlled at a fifth rotary speed (S5). When the difference between the ambient temperature and the target temperature ranges from −1° C. to 2° C., the rotary speed of the AC compressor 15 is controlled at a sixth rotary speed (S6). In this example, S1>S2>S3>S4>S5>S6. It is noted that, when the difference between the ambient temperature and the target temperature is equal to −1° C., the rotary speed of the AC compressor 15 is controlled to be zero, i.e., the AC compressor 15 is deactivated. As a result, it is possible to maintain the difference between the ambient temperature and the target temperature to a range from −1° C. to 1° C. through the control signal.
  • FIG. 3 illustrates the second preferred embodiment of a variable frequency control module 2′ for controlling an AC compressor 15 according to this invention, which is a modification of the first preferred embodiment. In this embodiment, the operating unit 22′ includes a plurality of used-operated switches 221. The display unit 26′ includes a liquid crystal display panel 261 for displaying the ambient temperature thereon, and a set of indicating lamps 262 for indicating information pertinent to the rotary speed of the AC compressor 15.
  • The following are some of the advantages attributed to the variable frequency control module 2,2′ of the present invention:
  • 1. During activation of the AC compressor 15, the rotary speed of the AC compressor 15 gradually increases or decreases, thereby minimizing noise and resulting in decreased power consumption.
  • 2. When the ambient temperature is approximate to the target temperature, the rotary speed of the AC compressor 15 is a relatively lowest rotary speed, i.e., the sixth rotary speed (S6) in the aforesaid example, and the difference between the ambient temperature and the target temperature can be constantly maintained within a desired narrow range. Therefore, constant temperature control can be achieved.
  • While the present invention has been described in connection with what are considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.

Claims (7)

1. A variable frequency control module for controlling an AC compressor in an air conditioning system, said variable frequency control module comprising:
a temperature detecting unit adapted for detecting ambient temperature, and outputting a detecting signal corresponding to the ambient temperature detected thereby;
an operating unit operable so as to output an input signal corresponding to a target temperature;
a processing unit coupled to said temperature detecting unit and said operating unit for receiving the detecting signal and the input signal therefrom, and outputting a control signal corresponding to a difference between the ambient temperature and the target temperature based on the detecting signal and the input signal;
an encoding unit coupled to said processing unit for receiving the control signal therefrom, encoding the control signal into an encoded signal, and outputting the encoded signal; and
a frequency converting unit coupled to said encoding unit for receiving the encoded signal therefrom, generating a driving signal having a frequency corresponding to the encoded signal from said encoding unit, and adapted to output the driving signal to the AC compressor so that the AC compressor is operated at a rotary speed based on the driving signal from said frequency converting unit.
2. The variable frequency control module as claimed in claim 1, wherein said encoding unit includes a plurality of switches coupled between said processing unit and said frequency converting unit.
3. The variable frequency control module as claimed in claim 1, further comprising a display unit coupled to said processing unit for displaying the ambient temperature.
4. The variable frequency control module as claimed in claim 3, wherein said display unit includes a seven-segment display.
5. The variable frequency control module as claimed in claim 3, wherein said display unit further indicates information pertinent to the rotary speed of the AC compressor.
6. The variable frequency control module as claimed in claim 5, wherein said display unit includes a liquid crystal display panel for displaying the ambient temperature thereon, and a set of indicating lamps for indicating the information pertinent to the rotary speed of the AC compressor.
7. The variable frequency control module as claimed in claim 1, wherein said operating unit includes a plurality of user-operated switches.
US12/157,851 2007-10-26 2008-06-13 Variable frequency control module for an AC compressor in an air conditioning system Abandoned US20090110562A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW096140366 2007-10-26
TW096140366A TW200919935A (en) 2007-10-26 2007-10-26 Constant-temperature frequency-converting module suitable for air-conditioning system

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102003377A (en) * 2010-11-23 2011-04-06 北京时代科仪新能源科技有限公司 Control device and method for air compressor
CN103343743A (en) * 2013-07-16 2013-10-09 海信（北京）电器有限公司 Automatic identifying method for frequency-conversion and constant-speed compressor and refrigerator
US8863535B2 (en) 2011-10-07 2014-10-21 Delta Electronics, Inc. Air conditioning apparatus and control method thereof
CN105864970A (en) * 2016-04-12 2016-08-17 青岛海尔空调器有限总公司 Method and device used for regulating consumption power of air conditioner
CN106091272A (en) * 2016-06-17 2016-11-09 广东美的制冷设备有限公司 The frequency adjustment method of transducer air conditioning and device
CN107039950A (en) * 2017-03-27 2017-08-11 珠海凌达压缩机有限公司 The method of compressor protection system, air conditioner and compressor protection system control
WO2018094912A1 (en) * 2016-11-25 2018-05-31 广东美的制冷设备有限公司 Control method for compressor, apparatus and household appliance
CN112268349A (en) * 2020-10-26 2021-01-26 珠海格力电器股份有限公司 Air conditioner, control method thereof, and computer-readable storage medium

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US4682648A (en) * 1982-12-29 1987-07-28 Morton Fried Temperature offset control system
US4891953A (en) * 1988-02-01 1990-01-09 Mitsubishi Denki Kabushiki Kaisha Control device for an air conditioner with floor temperature sensor
US5005365A (en) * 1988-12-02 1991-04-09 Inter-City Products Corporation (Usa) Thermostat speed bar graph for variable speed temperature control system
US5107685A (en) * 1989-12-05 1992-04-28 Kabushiki Kaisha Toshiba Air conditioning system having a control unit for fine adjustment of inverter input current
US5385297A (en) * 1991-10-01 1995-01-31 American Standard Inc. Personal comfort system
US5673568A (en) * 1994-06-03 1997-10-07 Kabushiki Kaisha Toshiba Apparatus and method for controlling an air conditioner
US6508072B1 (en) * 1998-10-26 2003-01-21 Toshiba Carrier Corporation Air conditioner outdoor unit drive control unit
US20050210897A1 (en) * 2004-03-26 2005-09-29 Mitsuyo Oomura Vehicular air-conditioner
US7096681B2 (en) * 2004-02-27 2006-08-29 York International Corporation System and method for variable speed operation of a screw compressor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4682648A (en) * 1982-12-29 1987-07-28 Morton Fried Temperature offset control system
US4891953A (en) * 1988-02-01 1990-01-09 Mitsubishi Denki Kabushiki Kaisha Control device for an air conditioner with floor temperature sensor
US5005365A (en) * 1988-12-02 1991-04-09 Inter-City Products Corporation (Usa) Thermostat speed bar graph for variable speed temperature control system
US5107685A (en) * 1989-12-05 1992-04-28 Kabushiki Kaisha Toshiba Air conditioning system having a control unit for fine adjustment of inverter input current
US5385297A (en) * 1991-10-01 1995-01-31 American Standard Inc. Personal comfort system
US5673568A (en) * 1994-06-03 1997-10-07 Kabushiki Kaisha Toshiba Apparatus and method for controlling an air conditioner
US6508072B1 (en) * 1998-10-26 2003-01-21 Toshiba Carrier Corporation Air conditioner outdoor unit drive control unit
US7096681B2 (en) * 2004-02-27 2006-08-29 York International Corporation System and method for variable speed operation of a screw compressor
US20050210897A1 (en) * 2004-03-26 2005-09-29 Mitsuyo Oomura Vehicular air-conditioner

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102003377A (en) * 2010-11-23 2011-04-06 北京时代科仪新能源科技有限公司 Control device and method for air compressor
US8863535B2 (en) 2011-10-07 2014-10-21 Delta Electronics, Inc. Air conditioning apparatus and control method thereof
CN103343743A (en) * 2013-07-16 2013-10-09 海信（北京）电器有限公司 Automatic identifying method for frequency-conversion and constant-speed compressor and refrigerator
CN105864970A (en) * 2016-04-12 2016-08-17 青岛海尔空调器有限总公司 Method and device used for regulating consumption power of air conditioner
CN106091272A (en) * 2016-06-17 2016-11-09 广东美的制冷设备有限公司 The frequency adjustment method of transducer air conditioning and device
WO2018094912A1 (en) * 2016-11-25 2018-05-31 广东美的制冷设备有限公司 Control method for compressor, apparatus and household appliance
CN107039950A (en) * 2017-03-27 2017-08-11 珠海凌达压缩机有限公司 The method of compressor protection system, air conditioner and compressor protection system control
CN112268349A (en) * 2020-10-26 2021-01-26 珠海格力电器股份有限公司 Air conditioner, control method thereof, and computer-readable storage medium

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TWI337447B (en) 2011-02-11

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Owner name: YAN YANG HIGH TECHNOLOGY CO., LTD., TAIWAN

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