WO2005067130A1 - Fan driving circuit having positive output-to-load characteristic - Google Patents

Fan driving circuit having positive output-to-load characteristic Download PDF

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Publication number
WO2005067130A1
WO2005067130A1 PCT/KR2005/000007 KR2005000007W WO2005067130A1 WO 2005067130 A1 WO2005067130 A1 WO 2005067130A1 KR 2005000007 W KR2005000007 W KR 2005000007W WO 2005067130 A1 WO2005067130 A1 WO 2005067130A1
Authority
WO
WIPO (PCT)
Prior art keywords
fan
induction motor
driving circuit
phase induction
load
Prior art date
Application number
PCT/KR2005/000007
Other languages
English (en)
French (fr)
Inventor
Hyung-Tae Moon
Original Assignee
Ventopia Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ventopia Ltd. filed Critical Ventopia Ltd.
Publication of WO2005067130A1 publication Critical patent/WO2005067130A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H35/00—Baths for specific parts of the body
    • A61H35/006—Baths for specific parts of the body for the feet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H39/00—Devices for locating or stimulating specific reflex points of the body for physical therapy, e.g. acupuncture
    • A61H39/04—Devices for pressing such points, e.g. Shiatsu or Acupressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/02—Characteristics of apparatus not provided for in the preceding codes heated or cooled
    • A61H2201/0207—Characteristics of apparatus not provided for in the preceding codes heated or cooled heated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/10—Characteristics of apparatus not provided for in the preceding codes with further special therapeutic means, e.g. electrotherapy, magneto therapy or radiation therapy, chromo therapy, infrared or ultraviolet therapy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5058—Sensors or detectors
    • A61H2201/5082—Temperature sensors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2205/00—Devices for specific parts of the body
    • A61H2205/12—Feet
    • 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 fan driving circuit having a positive output-to- load characteristic, and more particularly, to a driving circuit exhibiting a positive output characteristic with respect to fan load. More specifically, the present invention is directed to a fan driving circuit having a positive output-to-load characteristic for allowing a constant volume of air to be discharged from a plurality of ventilation fans used in an identical vent or a fan of a ventilating/exhaust pipe in which load is changed.
  • a conventional circuit for driving a commercial fan is generally designed such that the fan is driven at a constant speed under a certain condition using an induction motor.
  • a low-priced ventilation system is manufactured without any countermeasure to overcome the above phenomenon, whereas a high-priced ventilation system solves the above problem by including a ventilating fan control circuit (U.S. Patent Application Publication US2001/0033147) to which a feedback control circuit for the pressure measurement is added.
  • a ventilating fan control circuit U.S. Patent Application Publication US2001/0033147
  • an induction motor is rotated by generating a desired voltage waveform through pulse width modulation (PWM) using a DC voltage as electric power to control the 3-phase induction motor.
  • PWM pulse width modulation
  • the induction motor is controlled to increase the rotating speed thereof so that a constant volume of air can be discharged.
  • the conventional ventilation system as described above uses a method of measuring a pressure of air in the discharge port or measuring a phase current or DC link current, however, the total cost of the system will be certainly increased due to a pressure sensor for measuring the air pressure or a microprocessor for processing signals from the pressure sensor and creating commands for controlling the motor. Therefore, there is a problem in that the conventional method is not suitable to the home ventilation system or the small-capacity and low-priced ventilation system for use in office.
  • An object of the present invention is to provide a fan driving circuit having a positive output-to-load characteristic for allowing a constant volume of air to be discharged by means of a plurality of ventilation fans used in an identical vent or fans for ventilating/exhaust pipes in which load is changed, by causing a load condition of the driving circuit to be changed and thus the rotating speed of an induction motor to be increased or decreased without using any other expensive devices even when the load in the ventilating/exhaust pipes has been changed.
  • a fan driving circuit having a positive output-to-load characteristic, comprising a 3-phase induction motor for driving a fan, a power unit for applying electric power to the 3-phase induction motor, a capacitor C2 which is connected with the 3-phase induction motor to produce a phase difference between two phases, and an impedance unit which is connected in series with the 3-phase induction motor to allow a constant discharge volume of air to be produced even though load imposed on the fan is changed.
  • Fig. 1 is a circuit diagram of a fan driving circuit having a positive output-to-load characteristic according to an embodiment of the present invention
  • Fig. 2 is a graph illustrating load curves and operating points of the fan driving circuit having a positive output-to-load characteristic according to the present invention
  • Fig. 3 is a circuit diagram of a fan driving circuit having a positive output-to-load characteristic according to another embodiment of the present invention.
  • Fig. 1 is a circuit diagram illustrating an embodiment of a fan driving circuit having a positive output-to-load characteristic according to the present invention.
  • the fan driving circuit comprises a 3-phase induction motor 20 for driving a fan 10, a power unit 30 for applying electric power to the 3-phase induction motor 20, a capacitor C2 40 which is connected with the 3-phase induction motor 20 to produce a phase difference between two phases, and an impedance unit 50 which is connected in series with the 3-phase induction motor to allow a constant discharge volume of air to be produced even though load imposed on the fan 10 is changed.
  • Fig. 1 is a circuit diagram illustrating an embodiment of a fan driving circuit having a positive output-to-load characteristic according to the present invention.
  • the fan driving circuit comprises a 3-phase induction motor 20 for driving a fan 10, a power unit 30 for applying electric power to the 3-phase induction motor 20, a capacitor C2 40 which is connected with the 3-phase induction motor 20 to produce a phase difference between two phases, and an impedance unit 50 which is
  • FIG. 2 is a graph illustrating load curves and operating points of the fan driving circuit having a positive output-to-load characteristic according to the present invention.
  • operating points 100 and 200 which are located on lower and higher voltages A and B according to a load curve K, are shown, respectively, in cases where the voltages A and B are applied to the 3-phase induction motor 20 (refer to Fig. 1) according to load applied to the fan.
  • Fig. 3 is a circuit diagram of a fan driving circuit having a positive output-to-load characteristic according to another embodiment of the present invention.
  • a resistor R2 60 is connected in series with the impedance unit 50 and a switch 70 is connected in parallel with the resistor R2 60 to interrupt a current flowing along the resistor R2.
  • the impedance unit 50 which includes a capacitor Cl 51 and a resistor Rl 52 as load in series, is added to a conventional driving circuit of the 3-phase induction motor 20 including a capacitor. Therefore, constant amplitude of an alternating voltage is applied to the 3-phase induction motor 20 due to voltage distribution of an alternating voltage with constant amplitude and frequency between the 3-phase induction motor 20 including the capacitor C2 40 and the impedance unit 50 serving as load in series therewith.
  • a curve 'K' is a load curve of the fan
  • a curve 'A' is an output characteristic curve of the 3-phase induction motor 20 when the lower voltage is applied thereto
  • a curve 'B' is an output characteristic curve of the motor when the higher voltage is applied thereto.
  • the motor stably operates at a new operating point 100. That is, the load imposed on the fan is continuously changed, and the operating points can also be maintained between the maximum speed-to-torque operating point and the minimum speed-to-torque operating point.
  • the switch 70 and resistor R2 60 which are connected in parallel with each other, are added to the fan driving circuit as shown in Fig. 3, the serial resistance in load can be increased and thus the 3-phase induction motor 20 can be kept at a lower rotating speed.
  • the current flowing into the resistor R2 60 is cut off by turning on the switch 70, the voltage distributed to the 3-phase induction motor 20 is rapidly increased such that the rotating speed of the fan 10 can be rapidly increased. This may become another embodiment of the present invention.
  • Impedance unit 51 Capacitor C 1

Landscapes

  • Health & Medical Sciences (AREA)
  • Rehabilitation Therapy (AREA)
  • Animal Behavior & Ethology (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Pain & Pain Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Control Of Ac Motors In General (AREA)
PCT/KR2005/000007 2004-01-05 2005-01-04 Fan driving circuit having positive output-to-load characteristic WO2005067130A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2004-0000245 2004-01-05
KR1020040000245A KR100562028B1 (ko) 2004-01-05 2004-01-05 정부하대출력 특성 팬 구동회로

Publications (1)

Publication Number Publication Date
WO2005067130A1 true WO2005067130A1 (en) 2005-07-21

Family

ID=34747761

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2005/000007 WO2005067130A1 (en) 2004-01-05 2005-01-04 Fan driving circuit having positive output-to-load characteristic

Country Status (3)

Country Link
KR (1) KR100562028B1 (ko)
CN (1) CN100442649C (ko)
WO (1) WO2005067130A1 (ko)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5594593A (en) * 1979-01-10 1980-07-18 Hitachi Ltd Control means for three-phase induction motor
US5300870A (en) * 1990-10-05 1994-04-05 Smith Otto J M Three-phase motor control
JPH09168299A (ja) * 1995-12-13 1997-06-24 Matsushita Electric Ind Co Ltd 誘導電動機
JPH11236994A (ja) * 1998-02-23 1999-08-31 Mitsubishi Chem Mkv Co 型枠兼用断熱防水パネル及び蓄熱槽

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0777515B2 (ja) * 1983-01-05 1995-08-16 秀一 丸本 単相−３相変換回路
US4869274A (en) * 1986-07-23 1989-09-26 Berger Richard M Cooling apparatus for use in the manufacture of tobacco filters
CN2061223U (zh) * 1989-11-28 1990-08-29 毛盛超 电风扇微风调节装置
US6472843B2 (en) * 2000-01-20 2002-10-29 Fasco Industries, Inc. System specific fluid flow control with induction motor drive

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5594593A (en) * 1979-01-10 1980-07-18 Hitachi Ltd Control means for three-phase induction motor
US5300870A (en) * 1990-10-05 1994-04-05 Smith Otto J M Three-phase motor control
JPH09168299A (ja) * 1995-12-13 1997-06-24 Matsushita Electric Ind Co Ltd 誘導電動機
JPH11236994A (ja) * 1998-02-23 1999-08-31 Mitsubishi Chem Mkv Co 型枠兼用断熱防水パネル及び蓄熱槽

Also Published As

Publication number Publication date
CN1906844A (zh) 2007-01-31
CN100442649C (zh) 2008-12-10
KR100562028B1 (ko) 2006-03-16
KR20050071866A (ko) 2005-07-08

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