CN100442649C - 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
CN100442649C
CN100442649C CNB2005800019577A CN200580001957A CN100442649C CN 100442649 C CN100442649 C CN 100442649C CN B2005800019577 A CNB2005800019577 A CN B2005800019577A CN 200580001957 A CN200580001957 A CN 200580001957A CN 100442649 C CN100442649 C CN 100442649C
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CN
China
Prior art keywords
fan
load
phase induction
induction motor
phase
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Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
CNB2005800019577A
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Chinese (zh)
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CN1906844A (en
Inventor
文炯台
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VENTOPIA Ltd
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VENTOPIA Ltd
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Expired - Fee Related legal-status Critical Current
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    • 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
    • A61H35/00—Baths for specific parts of the body
    • A61H35/006—Baths for specific parts of the body for the feet
    • 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

Abstract

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 load in a fan. The fan driving circuit having a positive output-to-load characteristic according to the present invention comprises a 3-phase induction motor (20) for driving a fan, 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.

Description

Has positive fan drive circuit to the load output characteristic
Technical field
The present invention relates to a kind of positive fan drive circuit that has, relate in particular to a kind of drive circuit that presents the positive output characteristic with respect to fan load load output (output-to-load) characteristic.More particularly, the present invention relates to a kind of like this fan drive circuit, it has positive to the load output characteristic, in order to allow from a plurality of ventilation fans of using identical ventilating opening or to be used to ventilate/air of fan (load therein changes) the discharge constant basis of blast pipe.
Background technology
The traditional circuit that is used to drive commercial fan is designed to adopt under given conditions induction machine with constant speed drive fan usually.Therefore,, will apply electrical power, thereby ventilate so that induction machine rotates to the induction machine that fan is installed if satisfy certain condition (for example, temperature is higher or humidity is bigger).
Generally speaking, under the situation that adopts two-phase or three-phase induction motor, can induction machine be rotated by the magnetic circuit that utilizes electric capacity or change to be installed in the induction machine.
At this moment, externally power supply has under constant frequency and the voltage condition, and it presents negative to the load output characteristic.Therefore, if the load pressure of outlet increases, the load that is applied on the fan also can increase.Therefore, the torque that is applied on the motor also can increase, thereby the rotating speed of rotor reduces.Like this, the air capacity of discharge correspondingly reduces, and the air capacity of ventilating has also just reduced.
Do not adopting any measure to overcome under the situation of above-mentioned phenomenon, can produce cheap ventilating system, on the contrary, increase the ventilation fan control circuit that is useful on tonometric feedback control circuit by comprising, and the high ventilating system (publication number is the U.S. Patent application of US2001/0033147) of price that realizes can address the above problem.
Here, the conventional method that the ventilating system high according to price (publication number is the U.S. Patent application of US2001/0033147) adopted, direct current (DC) voltage is used as the electrical power of controlling 3 phase induction machines, and induction machine is rotated by the voltage waveform of pulse-width modulation (PWM) generation expectation.At this moment, obtain being applied to the load capacity on the fan, thereby the control induction machine is to increase its rotating speed, so that discharge the air of constant basis by measuring DC link current (link current).
Yet, adopt under air pressure of measuring in the outlet or the method situation of the measuring phase current or DC link current in aforesaid traditional ventilating system, because adopted to be used to measure the pressure sensor of air pressure or to be used to handle from the signal of pressure sensor and to generate the microprocessor of the instruction that is used to control motor, the overall cost of system will inevitably increase.Therefore, the problem of existence is traditional method and is not suitable for the ventilating system of family expenses or is used for the low capacity of office, the ventilating system of low price.
Summary of the invention
The present invention is intended to solve the above-mentioned problems in the prior art.The objective of the invention is to improve a kind of positive fan drive circuit that has to the load output characteristic, a plurality of ventilation fans that described circuit utilization is used in identical ventilating opening or be used to ventilate/fan (wherein load changes) of blast pipe, increase or reduce the rotating speed of induction machine by the loading condition that changes described drive circuit, thereby the feasible or even load in ventilation/blast pipe also need not to adopt any other price apparatus when changing, and just can discharge the air of constant basis.
According to an aspect of the present invention, provide a kind of positive fan drive circuit to the load output characteristic that has, can comprise: three-phase induction motor is used for drive fan; Power cell is used to described three-phase induction motor that electrical power is provided; Capacitor C 2 is connected with described three-phase induction motor, is used to produce the phase difference between the two-phase; And impedance unit, connect with described three-phase induction motor, even if be used for when the load that is applied to described fan changes, also can producing the discharged air of constant basis.Wherein, described impedance unit comprises capacitor C 1 and the resistance R 1 that is connected in parallel with capacitor C 1.
Description of drawings
Fig. 1 is the circuit diagram to the fan drive circuit of load output characteristic positive according to having of one embodiment of the invention;
Fig. 2 show according to having of one embodiment of the invention positive to the load curve of the fan drive circuit of load output characteristic and the curve chart of working point (operating point); And
Fig. 3 is the circuit diagram to the fan drive circuit of load output characteristic positive according to having of another embodiment of the invention.
Embodiment
Hereinafter with reference to accompanying drawing the preferred embodiments of the invention are described in detail.
Fig. 1 is the circuit diagram that has positive fan drive circuit to the load output characteristic according to of the present invention.This fan drive circuit comprises the 3 phase induction machines 20 that are used for drive fan 10, be used to 3 phase induction machines 20 that the power cell 30 of electrical power is provided, with 3 mutually induction machine 20 link to each other generating the capacitor C2 of phase difference between two phase places, thereby even and if with 3 mutually induction machine 20 series connection make the load that on fan 10, applies also can keep the constant impedance unit of exhaust air rate 50 when changing.
Fig. 2 shows according to of the present invention has the load curve of positive fan drive circuit to the load output characteristic and a curve chart of working point.Figure 2 illustrates when applying voltage A and B on the 3 phase induction machines 20, lay respectively at working point 100 and 200 on low-voltage A and the high voltage B according to load curve K according to loading on of on fan, applying.
Fig. 3 is the circuit diagram to the fan drive circuit of load output characteristic positive according to having of another embodiment of the invention.In this fan drive circuit, resistor R 260 is connected with impedance unit 50, switch 70 and resistor R 260 electric currents to interrupt flowing along resistor R 2 in parallel.
Hereinafter with reference to Fig. 1 to Fig. 3 work of the present invention and advantage are described.
Positive in order to make that the ventilating system that fan 10 (it is as the load of 3 phase induction machines 20) is installed produces to the load output characteristic curve, increase impedance unit 50 in the conventional ADS driving circuit of the 3 phase induction machines 20 that include capacitor, impedance unit 50 comprises that capacitor C1 51 and resistor R 1 52 are with as series load.Therefore, owing at the 3 phase induction machines 20 that comprise capacitor C2 40 and as the voltage distribution of the alternating voltage (having constant amplitude and frequency) between the impedance unit 50 of the load of series connection with it, on 3 phase induction machines 20, applied the alternating voltage of amplitude constant.
At this moment, fan drive circuit is worked on the balance point that depends on characteristic moment of torsion shown in Fig. 2 and velocity of rotation.In Fig. 2, curve " K " is the load curve of fan, and curve " A " is the output characteristic curve of 3 phase induction machines 20 when applying low-voltage, and curve " B " is the output characteristic curve of motor when applying high voltage.
Describe operation principle in detail hereinafter with reference to Fig. 2.When 3 phase induction machines 20 rotated on working point 100 with constant frequency, if the load of fan increases, then the revolutional slip (slip) in the 3 phase induction machines 20 will increase.Therefore, the equiva lent impedance of 3 phase induction machines 20 reduces, thereby makes electric current increase.
At this moment, because square being directly proportional of the torque that generates and electric current, so rotating speed of motor increases fast, so the equiva lent impedance of 3 phase induction machines 20 increases once more.Therefore, the voltage that distributes according to the constant load of series connection also increases (seeing curve " B ") thereupon, motor 200 rotations in new working point like this.
That is, under the load characteristic of motor shown in Figure 2 and fan, when the load of fan increased, the voltage that is applied increased.Therefore, motor is in stable state on the higher working point of motor speed.
On the other hand, if the load of fan reduces, equiva lent impedance will increase immediately, and electric current reduces simultaneously.Therefore, rotating speed reduces fast, and simultaneously equiva lent impedance also reduces, and on 3 phase induction machines 20 with after-applied lower voltage (seeing curve " A ").Motor is at new working point 100 steady operations thus.
That is to say that the load that is applied on the fan constantly changes, and the working point can be remained between maximal rate-torque (speed-to-torque) working point and the minimum speed-torque working point.
Simultaneously, owing to increased switch 70 and the resistor R 260 (as shown in Figure 3) that is connected in parallel to each other in fan drive circuit, so the series resistance in the load can increase, and therefore 3 phase induction machines 20 remained on lower rotating speed.At this moment, if cut off the electric current that flows into resistor R 260 by starting switch 70, the voltage that then is assigned on the 3 phase induction machines 20 will increase fast, thereby make the rotating speed of fan 10 increase fast.This can be used as another embodiment of the present invention.
Industrial applicability
According to the invention has the advantages that of making up as mentioned above, though use for high and Low floor have the ventilating system of public exhaust outlet place (for example apartment-type building) or The person is loaded into the place of the load change on the ventilating fan and (for example uses one to lead at a plurality of ventilating fans The situation in air port) in, also can be so that exhaust air rate keep constant substantially, and need not to use expensive Control appliance.
The label of critical piece in the accompanying drawing
10: fan 20:3 phase induction machine
30: power cell 40: capacitor C2
50: impedance unit 51: capacitor C1
52: resistor R 1 60: resistor R 2
70: switch

Claims (2)

1. one kind has the positive fan drive circuit to the load output characteristic, comprising:
Three-phase induction motor is used for drive fan;
Power cell is used to described three-phase induction motor that power is provided;
Capacitor C 2 is connected with described three-phase induction motor, is used to produce the phase difference between the two-phase; And
Impedance unit is connected with described three-phase induction motor, even if be used for when the load that is applied to described fan changes, also can producing the discharged air of constant basis,
Wherein, described impedance unit comprises capacitor C 1 and the resistance R 1 that is connected in parallel with capacitor C 1.
2. fan drive circuit as claimed in claim 1 further comprises the resistance R 2 of connecting with described impedance unit and the switch in parallel with described resistance R 2, thereby cuts off the electric current that flows along resistance R 2.
CNB2005800019577A 2004-01-05 2005-01-04 Fan driving circuit having positive output-to-load characteristic Expired - Fee Related CN100442649C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020040000245 2004-01-05
KR1020040000245A KR100562028B1 (en) 2004-01-05 2004-01-05 Fan driving circuit for positive pressure-to-output characteristic

Publications (2)

Publication Number Publication Date
CN1906844A CN1906844A (en) 2007-01-31
CN100442649C true CN100442649C (en) 2008-12-10

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Application Number Title Priority Date Filing Date
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KR (1) KR100562028B1 (en)
CN (1) CN100442649C (en)
WO (1) WO2005067130A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2061223U (en) * 1989-11-28 1990-08-29 毛盛超 Gentle breeze regulator for electric fan
US5300870A (en) * 1990-10-05 1994-04-05 Smith Otto J M Three-phase motor control

Family Cites Families (6)

* 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
JPH0777515B2 (en) * 1983-01-05 1995-08-16 秀一 丸本 Single-phase to three-phase conversion circuit
US4869274A (en) * 1986-07-23 1989-09-26 Berger Richard M Cooling apparatus for use in the manufacture of tobacco filters
JPH09168299A (en) * 1995-12-13 1997-06-24 Matsushita Electric Ind Co Ltd Induction motor
JPH11236994A (en) * 1998-02-23 1999-08-31 Mitsubishi Chem Mkv Co Heat insulating waterproof panel concurrently serving as form and heat accumulating tank
US6472843B2 (en) * 2000-01-20 2002-10-29 Fasco Industries, Inc. System specific fluid flow control with induction motor drive

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2061223U (en) * 1989-11-28 1990-08-29 毛盛超 Gentle breeze regulator for electric fan
US5300870A (en) * 1990-10-05 1994-04-05 Smith Otto J M Three-phase motor control

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
特开昭JP55-94593 1980.07.18

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CN1906844A (en) 2007-01-31
WO2005067130A1 (en) 2005-07-21
KR20050071866A (en) 2005-07-08
KR100562028B1 (en) 2006-03-16

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EE01 Entry into force of recordation of patent licensing contract

Assignee: Jiang Qixie

Assignor: Ventopia Ltd.|Ventopia Ltd.|Li Chenghuan

Contract fulfillment period: 2009.11.27 to 2025.1.4 contract change

Contract record no.: 2010990000075

Denomination of invention: Fan driving circuit having positive output-to-load characteristic

Granted publication date: 20081210

License type: Exclusive license

Record date: 2010.1.28

LIC Patent licence contract for exploitation submitted for record

Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.11.27 TO 2025.1.4; CHANGE OF CONTRACT

Name of requester: JIANG QIXIE

Effective date: 20100128

C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20081210

Termination date: 20120104