CN109245654B - Starting control method and device of direct current fan, outdoor unit and air conditioner - Google Patents

Starting control method and device of direct current fan, outdoor unit and air conditioner Download PDF

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Publication number
CN109245654B
CN109245654B CN201811115566.3A CN201811115566A CN109245654B CN 109245654 B CN109245654 B CN 109245654B CN 201811115566 A CN201811115566 A CN 201811115566A CN 109245654 B CN109245654 B CN 109245654B
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fan
current
direct current
speed threshold
speed
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CN109245654A (en
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黄招彬
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/34—Arrangements for starting
    • 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
    • F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
    • H02P21/0021—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control using different modes of control depending on a parameter, e.g. the speed
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Abstract

The invention discloses a starting control method and device of a direct current fan, an outdoor unit and an air conditioner. The starting control method comprises the following steps: based on zero voltage injection, obtaining three-phase current of the direct current fan and determining the initial speed and the rotation direction of the direct current fan; determining the relation between the initial speed of the direct current fan and a preset speed threshold; and controlling the direct current fan to enter different starting modes according to the relation between the initial speed of the direct current fan and a preset speed threshold value. The starting control method of the direct current fan in the embodiment estimates the initial speed of the direct current fan based on the zero voltage injection, and can calculate the initial speed and the rotating direction according to the three-phase current of the direct current fan. Furthermore, the direct current fan is controlled to enter different starting modes according to different initial speeds, so that the starting success rate of the direct current fan under the condition of abnormal weather (wind blowing and rain falling) can be improved, the abnormal faults are reduced, and the user experience is improved.

Description

Starting control method and device of direct current fan, outdoor unit and air conditioner
Technical Field
The invention relates to the technical field of motor control, in particular to a starting control method and device of a direct current fan, an outdoor unit and an air conditioner.
Background
In the related art, the dc fan is widely used in many electric products due to its high efficiency, such as an outdoor fan in a variable frequency air conditioner. In the application of the air conditioner, due to weather, typhoon and the like, the outdoor unit direct current fan usually works under the condition that the initial speed is not zero, namely the direct current fan is required to be started and operated under the condition of certain initial speed (forward rotation along the wind or reverse rotation along the wind). However, in the application of the air conditioner without position sensor control, the direct current fan is easily failed to start under the condition that the direct current fan has a certain initial speed, and the work of the air conditioning system is affected.
Disclosure of Invention
The embodiment of the invention provides a starting control method and device of a direct current fan, an outdoor unit and an air conditioner.
The starting control method of the direct current fan comprises the following steps:
based on zero voltage injection, acquiring three-phase current of the direct current fan and determining initial speed and rotation direction of the direct current fan according to the three-phase current of the direct current fan;
determining the relation between the initial speed of the direct current fan and a preset speed threshold;
and controlling the direct current fan to enter different starting modes according to the relation between the initial speed of the direct current fan and the preset speed threshold.
The starting control method of the direct current fan in the embodiment estimates the initial speed of the direct current fan based on the zero voltage injection, and can calculate the initial speed and the rotating direction according to the three-phase current of the direct current fan. Furthermore, the direct current fan is controlled to enter different starting modes according to different initial speeds, so that the starting success rate of the direct current fan under the condition of abnormal weather (wind blowing and rain falling) can be improved, the abnormal faults are reduced, and the user experience is improved.
In some embodiments, the preset speed threshold includes a first speed threshold, and the controlling the dc fan to enter different start modes according to a relationship between an initial speed of the dc fan and the preset speed threshold includes: when the initial speed is larger than the first speed threshold value, controlling the direct current fan to enter a direct closed loop starting mode; wherein the first speed threshold is a positive number.
In some embodiments, the preset speed threshold includes a second speed threshold, and the controlling the dc fan to enter different start modes according to a relationship between an initial speed of the dc fan and the preset speed threshold includes: when the initial speed is greater than the second speed threshold and not greater than the first speed threshold, controlling the direct current fan to enter an energy-consumption braking starting mode; wherein the first speed threshold > the second speed threshold, the second speed threshold being a positive number.
In some embodiments, the preset speed threshold includes a third speed threshold, and the controlling the dc fan to enter different start modes according to a relationship between an initial speed of the dc fan and the preset speed threshold includes: when the initial speed is greater than the third speed threshold and not greater than the second speed threshold, controlling the direct current fan to enter a normal positioning starting mode; wherein the second speed threshold > the third speed threshold, the third speed threshold being a negative number.
In some embodiments, the preset speed threshold includes a fourth speed threshold, and the controlling the dc fan to enter different start modes according to a relationship between an initial speed of the dc fan and the preset speed threshold includes: when the initial speed is greater than the fourth speed threshold and not greater than the third speed threshold, controlling the direct current fan to enter the dynamic braking starting mode; when the initial speed is not greater than the fourth speed threshold, re-detecting the initial speed of the direct current fan, and controlling the direct current fan to be in a waiting state; wherein the third speed threshold > the fourth speed threshold; the fourth speed threshold is negative.
In some embodiments, the start-up control method includes: when the direct current fan is in the normal positioning starting mode, firstly controlling the direct current fan to pass through a positioning process of current injection, then controlling the direct current fan to enter open-loop operation, and when the current rotating speed of the direct current fan reaches a switching speed threshold value during the open-loop operation, controlling the direct current fan to enter closed-loop operation; when the direct current fan is in the energy consumption braking starting mode, firstly controlling the direct current fan to pass through the energy consumption braking process, then controlling the direct current fan to enter open-loop operation, and when the current rotating speed of the direct current fan reaches the switching speed threshold value during the open-loop operation, controlling the direct current fan to enter closed-loop operation; and when the direct current fan is in the direct closed-loop starting mode, controlling the direct current fan to enter closed-loop operation.
In some embodiments, obtaining three-phase current of the dc fan and determining an initial speed and a rotational direction of the dc fan from the three-phase current of the dc fan based on zero voltage injection comprises: and obtaining the three-phase current of the direct current fan based on zero voltage injection, and determining the initial speed and the rotation direction of the direct current fan according to the current zero-crossing time and the current signal sign of the three-phase current of the direct current fan in a two-phase static coordinate system.
In some embodiments, acquiring the three-phase current of the dc fan based on the zero voltage injection, and determining the initial speed and the rotation direction of the dc fan according to the current zero-crossing time and the current signal sign of the three-phase current of the dc fan in the two-phase stationary coordinate system includes: acquiring three-phase current of the direct current fan when zero voltage is injected; converting the three-phase current to the two-phase static coordinate system to obtain a first current and a second current; and calculating the initial speed and the rotation direction of the direct current fan according to the first current and the second current.
In some embodiments, calculating an initial speed and rotational direction of the dc fan from the first current and the second current comprises: calculating the initial speed of the direct current fan according to the time difference value of two adjacent zero-crossing points of the first current and the second current, and judging the rotation direction of the direct current fan according to the signs of the first current and the second current at the zero-crossing time.
In some embodiments, the start-up control method includes: and when the difference value of the zero-crossing time of the two adjacent times is larger than a preset value, determining that the initial speed of the direct current fan is zero.
In some embodiments, the dc fan is connected to a driving module, the driving module includes three upper bridge arms and three lower bridge arms connected to each other, each of the three bridge arms includes a power switch tube, the power switch tube is connected in anti-parallel with a diode, and the zero voltage injection includes: and controlling the three upper bridge arms to be switched on simultaneously and the three lower bridge arms to be switched off simultaneously, or controlling the three upper bridge arms to be switched off simultaneously and the three lower bridge arms to be switched on simultaneously, so that the direct current fan is in a working state of short circuit of a three-phase winding to realize the zero voltage injection.
In some embodiments, obtaining three-phase current of the dc fan includes one of: detecting the bus current of the direct current fan, and calculating the three-phase current of the direct current fan according to the bus current of the direct current fan; detecting two-phase current of the direct current fan, and calculating three-phase current of the direct current fan according to the two-phase current of the direct current fan; and detecting and obtaining the three-phase current of the direct current fan.
The start control device of the direct current fan of the embodiment of the invention comprises:
the detection module is used for acquiring three-phase current of the direct current fan based on zero voltage injection and determining the initial speed and the rotation direction of the direct current fan according to the three-phase current of the direct current fan;
the comparison module is used for determining the relation between the initial speed of the direct current fan and a preset speed threshold;
and the control module is used for controlling the direct current fan to enter different starting modes according to the relation between the initial speed of the direct current fan and the preset speed threshold.
In the start control device of the direct current fan according to the embodiment, the initial speed of the direct current fan is estimated based on the zero voltage injection, the initial speed and the rotation direction can be calculated according to the three-phase current of the direct current fan, and the control method is relatively simple and easy to implement. Furthermore, the direct current fan is controlled to enter different starting modes according to different initial speeds, so that the starting success rate of the direct current fan under the condition of abnormal weather (wind blowing and rain falling) can be improved, the abnormal faults are reduced, and the user experience is improved.
In some embodiments, the preset speed thresholds include a first speed threshold, the control module to: when the initial speed is larger than the first speed threshold value, controlling the direct current fan to enter a direct closed loop starting mode; wherein the first speed threshold is a positive number.
In some embodiments, the preset speed threshold comprises a second speed threshold, and the control module is configured to: when the initial speed is greater than the second speed threshold and not greater than the first speed threshold, controlling the direct current fan to enter an energy-consumption braking starting mode; wherein the first speed threshold > the second speed threshold, the second speed threshold being a positive number.
In some embodiments, the preset speed thresholds include a third speed threshold, the control module to: when the initial speed is greater than the third speed threshold and not greater than the second speed threshold, controlling the direct current fan to enter a normal positioning starting mode; wherein the second speed threshold > the third speed threshold, the third speed threshold being a negative number.
In some embodiments, the preset speed thresholds include a fourth speed threshold, and the control module is configured to: when the initial speed is greater than the fourth speed threshold and not greater than the third speed threshold, controlling the direct current fan to enter the dynamic braking starting mode; when the initial speed is not greater than the fourth speed threshold, re-detecting the initial speed of the direct current fan, and controlling the direct current fan to be in a waiting state; wherein the third speed threshold > the fourth speed threshold; the fourth speed threshold is negative.
In certain embodiments, the control module is to: when the direct current fan is in the normal positioning starting mode, firstly controlling the direct current fan to pass through a positioning process of current injection, then controlling the direct current fan to enter open-loop operation, and when the current rotating speed of the direct current fan reaches a switching speed threshold value during the open-loop operation, controlling the direct current fan to enter closed-loop operation; when the direct current fan is in the energy consumption braking starting mode, firstly controlling the direct current fan to pass through the energy consumption braking process, then controlling the direct current fan to enter open-loop operation, and when the current rotating speed of the direct current fan reaches the switching speed threshold value during the open-loop operation, controlling the direct current fan to enter closed-loop operation; and when the direct current fan is in the direct closed-loop starting mode, controlling the direct current fan to enter closed-loop operation.
In some embodiments, the detection module is configured to obtain three-phase currents of the dc fan based on zero voltage injection, and determine an initial speed and a rotation direction of the dc fan according to a current zero-crossing time and a current signal sign of the three-phase currents of the dc fan in a two-phase stationary coordinate system.
In certain embodiments, the detection module is to: acquiring three-phase current of the direct current fan when zero voltage is injected; converting the three-phase current to the two-phase static coordinate system to obtain a first current and a second current; and calculating the initial speed and the rotation direction of the direct current fan according to the first current and the second current.
In some embodiments, the detection module is configured to calculate an initial speed of the dc fan according to a difference between two adjacent zero-crossings of the first current and the second current, and determine a rotation direction of the dc fan according to signs of the first current and the second current at the zero-crossing time.
In some embodiments, the detection module is configured to determine that the initial speed of the dc fan is zero when the difference between the two adjacent zero-crossing times is greater than a preset value.
In some embodiments, the dc fan is connected to a driving module, the driving module includes three upper bridge arms and three lower bridge arms connected to each other, each of the three bridge arms includes a power switching tube, the power switching tubes are connected in anti-parallel to each other with a diode, and the control module is configured to control the three upper bridge arms to be turned on at the same time and the three lower bridge arms to be turned off at the same time, or control the three upper bridge arms to be turned off at the same time and the three lower bridge arms to be turned on at the same time, so that the dc fan is in a working state where a three-phase winding is shorted to achieve the zero-voltage.
In some embodiments, the detection module is connected to a current sensor, the current sensor is configured to detect a bus current of the dc fan, and the detection module is configured to obtain the bus current of the dc fan and calculate a three-phase current of the dc fan according to the bus current of the dc fan; or the current sensor is used for detecting two-phase current of the direct current fan, and the detection module is used for acquiring the two-phase current of the direct current fan and calculating three-phase current of the direct current fan according to the two-phase current of the direct current fan; or the current sensor is used for detecting the three-phase current of the direct current fan, and the detection module is used for acquiring the three-phase current of the direct current fan.
An outdoor unit according to an embodiment of the present invention includes a dc fan and a start control device for the dc fan according to any one of the above embodiments.
In the outdoor unit according to the above embodiment, the initial speed of the dc fan is estimated based on the zero voltage injection, and the initial speed and the rotation direction can be calculated from the three-phase current of the dc fan. Furthermore, the direct current fan is controlled to enter different starting modes according to different initial speeds, so that the starting success rate of the direct current fan under the condition of abnormal weather (wind blowing and rain falling) can be improved, the abnormal faults are reduced, and the user experience is improved.
The air conditioner of the embodiment of the invention comprises a direct current fan and a starting control device of the direct current fan in any embodiment.
In the air conditioner of the above embodiment, the initial speed of the dc fan is estimated based on the zero voltage injection, and the initial speed and the rotation direction can be calculated from the three-phase current of the dc fan. Furthermore, the direct current fan is controlled to enter different starting modes according to different initial speeds, so that the starting success rate of the direct current fan under the condition of abnormal weather (wind blowing and rain falling) can be improved, the abnormal faults are reduced, and the user experience is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a control circuit topology diagram of a DC fan in accordance with an embodiment of the present invention;
FIG. 2 is a block diagram of the vector control of the DC fan of an embodiment of the present invention;
fig. 3 is a flowchart illustrating a start control method of the dc fan according to the embodiment of the present invention;
fig. 4 is another schematic flow chart of a start control method of the direct current fan according to the embodiment of the invention;
FIG. 5 is a schematic of zero voltage injection for a DC fan according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of an initial speed estimation of a DC fan of an embodiment of the present invention;
FIG. 7 is a schematic illustration of a normal position start mode of a DC fan according to an embodiment of the present invention;
FIG. 8 is a control block diagram of a positioning process of a DC fan in an embodiment of the present invention;
FIG. 9 is a control block diagram of the open loop operation of the DC fan of an embodiment of the present invention;
FIG. 10 is a schematic illustration of a dynamic braking initiation mode of the DC fan of an embodiment of the present invention;
FIG. 11 is a control block diagram of the zero voltage braking of the DC fan of an embodiment of the present invention;
fig. 12 is a control block diagram of the forced braking of the direct current fan according to the embodiment of the present invention;
FIG. 13 is a schematic illustration of a direct closed loop startup mode of a DC fan according to an embodiment of the present invention;
FIG. 14 is a block diagram of a start control device for a DC fan according to an embodiment of the present invention;
fig. 15 is a schematic structural view of an air conditioner according to an embodiment of the present invention.
Description of the main element symbols:
the system comprises a direct current fan 10, a driving module 20, a control chip 30, an electrolytic capacitor 40, a current sensor 50, a start control device 100, a detection module 110, a comparison module 120, a control module 130, an air conditioner 1000, an outdoor unit 1100 and an indoor unit 1200.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1, in the embodiment of the present invention, a control circuit topology of the dc fan 10 includes the dc fan 10, a driving module 20, a control chip 30 and an electrolytic capacitor 40. The direct current fan 10 is connected with a driving module 20. The driving module 20 is a three-phase bridge driving circuit composed of power switching tubes. The drive module 20 comprises three upper and three lower bridge arms connected. The three upper bridge arms and the three lower bridge arms are respectively connected to form a three-phase bridge arm. The first upper leg and the first lower leg are connected with a first node a1, the second upper leg and the second lower leg are connected with a second node a2, and the third upper leg and the third lower leg are connected with a third node A3. The first node, the second node and the third node are respectively and correspondingly connected with a three-phase winding of the direct current fan 10. The control chip 30 may output a driving signal of the dc fan 10 to the driving module 20 to control on and off of six power switching tubes in the driving module 20, so as to control operation of the dc fan 10.
The bridge arm comprises a power switch tube, and the power switch tube is reversely connected with a diode in parallel. The power switch tube may be an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor). Of course, the driving Module 20 may also be an Intelligent Power Module (IPM) in which six IGBTs are packaged, wherein each IGBT is connected with a diode in anti-parallel. The dc fan 10 may be a fan driven by a permanent magnet brushless dc motor or a permanent magnet synchronous motor.
Referring to fig. 2, in the present embodiment, the dc fan 10 is a position sensorless type. In sensorless vector control of the dc fan 10, the rotational speed is set
Figure BDA0001810467840000061
And estimating the rotational speed
Figure BDA0001810467840000062
Outputting a given torque via a proportional-integral controller (PI)
Figure BDA0001810467840000063
For example, in the direct current fan 10 (surface mount permanent magnet synchronous motor), according to a given torque
Figure BDA0001810467840000064
And the torque current coefficient KtCalculating to obtain a given torque current
Figure BDA0001810467840000065
(q-axis current) given direct-axis current
Figure BDA0001810467840000066
(d-axis current) by field weakening current ifwcAnd (6) determining. According to given d-axis current
Figure BDA0001810467840000067
Given q-axis current
Figure BDA0001810467840000068
And a feedback current id/iqOutput voltage u via vector controld/uqThen, inverse conversion is carried out on the Pack (Park) to obtain a control output voltage uα/uβAnd outputs a PWM (Pulse Width Modulation) waveform through Space Vector Modulation (SVM), and drives the dc fan 10 (surface-mounted permanent magnet synchronous motor) through the driving module 20. Therefore, the three-phase current of the dc fan 10 can be detected by the current sensor 50, and the feedback current i is obtained through Clarke (Clarke) conversionα/iβThen obtaining a feedback current i through the change of Parkd/iq. Can then be based on the output voltage uα/uβAnd a feedback current iα/iβAnd motor parameters (motor resistance R)sStraight axis inductor LdAnd quadrature axis inductance Lq) Calculating the estimated rotating speed of the direct current fan 10 by a position-sensorless estimation algorithm
Figure BDA0001810467840000071
And estimating the electrical angle
Figure BDA0001810467840000072
In addition, i isd/iqRepresents idAnd iqTwo quantities ud/uqRepresents udAnd uqTwo quantities uα/uβRepresents uαAnd uβTwo quantities, iα/iβRepresents iαAnd iβTwo amounts.
Referring to fig. 3 and 4, a start control method of the direct current fan 10 according to the embodiment of the present invention includes:
step S10: obtaining three-phase current (i) of the DC fan 10 based on zero voltage injectionA、iBAnd iC) And determining the initial speed omega of the direct current fan 10 according to the three-phase current of the direct current fan 100And a direction of rotation.
Referring to fig. 5, in step S10, the zero voltage injection is to inject zero voltage into the dc fan 10. In one embodiment, three upper bridge arms and three lower bridge arms can be controlled to be turned on and off simultaneously, so that the dc fan 10 is in a short-circuited working state of a three-phase winding to realize zero-voltage injection. At this time, the three-phase winding of the dc fan 10 forms a short circuit through the power switching tubes of the three upper bridge arms and the anti-parallel diodes thereof. In another embodiment, three upper bridge arms and three lower bridge arms can be controlled to be turned off and turned on simultaneously, so that the dc fan 10 is in a short-circuited working state of the three-phase winding to realize zero-voltage injection. At this time, the three-phase winding of the dc fan 10 forms a short circuit through the power switching tubes of the three lower arms and the anti-parallel diodes thereof. Therefore, the generating current can be generated and the effect of dynamic braking can be achieved. Zero voltage is equivalent to zero vector voltage.
Specifically, step S10 includes: based on zero voltage injection, obtaining the three-phase current of the direct current fan 10, and determining the initial speed omega of the direct current fan 10 according to the current zero crossing time and the current signal sign of the three-phase current of the direct current fan 10 in the two-phase static coordinate system0And a direction of rotation.
It can be understood that, by obtaining the three-phase current of the dc fan 10 when the zero voltage is injected; then, the three-phase current is converted to a two-phase static coordinate system to obtain a first current iαAnd a second current iβ. Thus, it is possible to vary the first current iαAnd a second current iβCalculating the initial speed ω of the DC fan 100And a direction of rotation. Three-phase current (i) of a direct current motorA、iBAnd iC) The first current i may be obtained by Clarke transformation to a two-phase stationary frameαAnd a second current iβ. The three-phase current of the dc fan 10 can be obtained by detecting the bus current of the dc fan 10 through a current sensor 50 and calculating according to the bus current. The three-phase current of the dc fan 10 can also be obtained by detecting two-phase currents of the dc fan 10 through two current sensors 50, and calculating according to the two-phase currents. The three-phase current of the dc fan 10 can also be detected and obtained by the three current sensors 50. In the example of fig. 1, three current sensors 50 are respectively connected to the three-phase windings of the dc fan 10, and the three current sensors 50 respectively detect and acquire three-phase currents and then transmit current signals to the control chip 30.
In one example, the first current iαAnd a second current iβMay be of a sinusoidal type. In other examples, the first current iαAnd a second current iβOther wave patterns are also possible.
Further, according to the first current iαAnd a second current iβCalculating the initial speed ω of the DC fan 100And the direction of rotation includes: according to the first current iαAnd a second current iβThe initial speed omega of the direct current fan 10 is calculated according to the time difference value of two adjacent zero-crossing points0And according to the first current iαAnd a second current iβThe sign at the zero-crossing time determines the direction of rotation of the dc fan 10.
In one example, referring to FIG. 6, when the second current iβAt the zero crossing point, the first current i is recorded as the time T1αThe symbol of (2). When the first current i passes through the timeαAt the zero crossing point, time T2 is recorded, and the second current i is recordedβThe symbol of (2).
At this time, the initial rotation speed of the dc fan 10 is 60/(pole pair number 4 (T2-T1)) in RPM (rev). When the first current iαSign of (a) and a second current iβWhen the signs of (a) are the same, the rotation direction of the dc fan 10 is clockwise (indicating that the dc fan 10 rotates forward); when the first current iαSign of (a) and a second current iβWhen the signs of (a) and (b) are opposite to each other, the rotation direction of the dc fan 10 is counterclockwise (indicating that the dc fan 10 is reversely rotated). Initial velocity ω0Including the initial speed and direction. Initial velocity ω0Is determined according to the rotation direction of the dc fan 10. In one example, when the rotational direction of the DC fan 10 is clockwise, the initial speed ω is0Is positive; when the rotation direction of the dc fan 10 is counterclockwise, the initial speed ω is0Is negative, the initial speed omega of the direct current fan 100And the direction of rotation is as shown in the following table:
Figure BDA0001810467840000081
Figure BDA0001810467840000091
in another example, when the first current iαAt the zero crossing point, the second current i is recorded as the time T1βThe symbol of (2). When the second current i passes through the second current collectorβAt the zero crossing point, time T2 is recorded, and the first current i is recordedαThe symbol of (2).
At this time, the initial rotation speed of the dc fan 10 is 60/(pole pair number 4 (T2-T1)) in RPM (rev). When the first current iαSign of (a) and a second current iβWhen the sign of (d) is the same, the rotation direction of the dc fan 10 is counterclockwise (indicating that the dc fan 10 is reversely rotated); when the first current iαSign of (a) and a second current iβWhen the signs of (a) and (b) are opposite, the rotation direction of the dc fan 10 is clockwise (indicating that the dc fan 10 rotates forward) and the initial speed ω of the dc fan 10 is equal to or lower than the predetermined speed ω0And the direction of rotation is as shown in the following table:
Figure BDA0001810467840000092
further, when the first current iαAnd a second current iβWhen the difference (T2-T1) between two adjacent zero-crossing times is greater than the preset value, the initial speed of the dc fan 10 may be considered to be approximately zero, and in this case, the initial speed ω of the dc fan 10 may be determined0Is zero. At this time, it is not necessary to determine the rotation direction of the dc fan 10. The preset value is, for example, 1 second, and when the (T2-T1) exceeds 1 second, the rotation speed is less than (15/log) RPM.
The start control method of the direct current fan 10 according to the embodiment of the present invention includes:
step S20: determining an initial speed ω of the DC fan 100In relation to a preset speed threshold.
Specifically, the initial speed ω of the dc fan 10 is determined0Thereafter, an initial speed ω of the dc fan 10 is determined0In relation to a preset speed threshold. The preset speed threshold comprises a first speed threshold omega1Second speed threshold ω2Third speed threshold ω3And a fourth speed threshold ω4. Wherein the first speed threshold ω1>Second speed threshold ω2>Third speed threshold ω3>Fourth speed threshold ω4. First speed threshold ω1And a second speed threshold ω2Being positive, third speed threshold ω3And a fourth speedThreshold value omega4Is a negative number. In some embodiments, the first speed threshold ω is1And a second speed threshold ω2For positive numbers to be understood as positive rotational speeds, a third speed threshold ω3And a fourth speed threshold ω4Negative numbers are understood to mean reverse rotational speeds.
In some examples, the first speed threshold ω1May be 300RPM, or 400RPM, or a value between 300RPM and 400 RPM. Second speed threshold ω2May be 40RPM, or 50RPM, or a value between 40RPM and 50 RPM. Third speed threshold ω3May be-40 RPM, or-50 RPM, or a value between-50 RPM and-40 RPM. Fourth speed threshold ω4May be-300 RPM, or-400 RPM, or a value between-400 RPM and-300 RPM. Preferably, the first speed threshold ω1And a fourth speed threshold ω4Are the same, the second speed threshold value omega2And a third speed threshold ω3Are the same in absolute value.
Specifically, step S20 includes:
step S22: judging the initial speed omega0Whether or not it is greater than a first speed threshold ω1. When the initial speed ω0Not greater than a first speed threshold ω1Then, the flow proceeds to step S24: judging the initial speed omega0Whether or not it is greater than a second speed threshold ω2. When the initial speed ω0Not greater than a second speed threshold ω2Then, the flow proceeds to step S26: judging the initial speed omega0Whether or not it is greater than a third speed threshold ω3. When the initial speed ω0Not greater than a third speed threshold ω3Then, the flow proceeds to step S28: judging the initial speed omega0Whether or not it is greater than a fourth speed threshold ω4。
The start control method of the direct current fan 10 according to the embodiment of the present invention includes:
step S30: according to the initial speed omega of the direct current fan 100In relation to the preset speed threshold, the dc fan 10 is controlled to enter different start modes.
Specifically, when the initial speed ω is0Greater than a first speed threshold ω1When it comes to stepStep S32: the dc fan 10 is controlled to enter a direct closed loop start mode. When the initial speed ω0Greater than a second speed threshold ω2And is not greater than a first speed threshold ω1Then, the flow proceeds to step S34: and controlling the direct current fan 10 to enter an energy consumption braking starting mode. When the initial speed ω0Greater than a third speed threshold ω3And not greater than a second speed threshold ω2Then, the flow proceeds to step S36: and controlling the direct current fan 10 to enter a normal positioning starting mode. When the initial speed ω0Greater than a fourth speed threshold ω4And is not greater than a third speed threshold ω3Then, the flow proceeds to step S34: and controlling the direct current fan 10 to enter an energy consumption braking starting mode. When the initial speed ω0Not greater than a fourth speed threshold ω4At the same time, the initial speed ω of the dc fan 10 is re-determined0Namely, the process returns to step S10, and the dc fan 10 is controlled to be in the waiting state.
Referring to fig. 7, when the dc fan 10 is in the normal positioning start mode, the dc fan 10 is controlled to pass through the positioning process of current injection, and then the dc fan 10 is controlled to enter the open-loop operation, and when the current rotation speed of the dc fan 10 reaches the switching speed threshold during the open-loop operation, the dc fan 10 is controlled to enter the closed-loop operation.
Referring to fig. 8, during the positioning process, a given d-axis current and a given q-axis current are set, and a fixed decoupling angle is set to determine the position of the rotor of the dc fan 10 so as to control the operation of the dc fan 10. The setting of the given d-axis current and the given q-axis current means that the given d-axis current and the given q-axis current are given according to a certain rule, for example, the d-axis current and the q-axis current respectively gradually rise from zero to a set value and then remain unchanged. The set values of the d-axis current and the q-axis current may be the same or different. In other embodiments, the positioning process may set the given q-axis current to zero, and the given d-axis current gradually rises from zero to a set value; or the given d-axis current may be set to zero and the given q-axis current may be ramped up from zero to the set value. The decoupling angle is not zero. In the example of FIG. 8, a position sensorless estimation algorithm may be employed to estimate the flux linkage angle and speed of the DC fan 10.
Referring to fig. 9, during the open-loop operation, a given d-axis current and a given q-axis current are set, and a decoupling angle is set, so that the rotation speed of the dc fan 10 is increased. Setting the given d-axis current and the given q-axis current means that the given d-axis current and the given q-axis current are given according to a certain rule, for example, the d-axis current and the q-axis current are kept constant at set values; for another example, the d-axis current and the q-axis current gradually increase from zero to a set value, and then remain unchanged. The set values of the d-axis current and the q-axis current may be the same or different. In other embodiments, the open-loop operation may set the given q-axis current to zero, with the given d-axis current gradually increasing from zero to a set value; or the given d-axis current may be set to zero and the given q-axis current may be ramped up from zero to the set value. The rate of change of the decoupling angle gradually decreases from the speed at the moment when the positioning process ends (initial value of the rate of change of the decoupling angle) to zero. In the example of FIG. 9, a position sensorless estimation algorithm may be employed to estimate the flux linkage angle and speed of the DC fan 10.
Referring to FIG. 2, during closed loop operation, which includes current loop control and speed loop control, the estimated electrical angle of the DC fan 10 is used
Figure BDA0001810467840000111
Decoupling to give a given rotational speed
Figure BDA0001810467840000112
And the estimated rotational speed of the DC fan 10
Figure BDA0001810467840000113
And performing closed-loop control, wherein the direct current fan 10 runs at a certain rotating speed during closed-loop running. For example, the DC fan 10 is operated at a given rotational speed
Figure BDA0001810467840000114
And (5) operating.
Referring to fig. 10, when the dc fan 10 is in the dynamic braking start mode, the dc fan 10 is controlled to pass through the dynamic braking process, and then the dc fan 10 is controlled to enter the open-loop operation, and when the current rotation speed of the dc fan 10 reaches the switching speed threshold during the open-loop operation, the dc fan 10 is controlled to enter the closed-loop operation. In the dynamic braking start mode, i.e. when the dc fan 10 has a certain forward or reverse initial speed, the dynamic braking is required first. The dynamic braking process comprises two processes of zero voltage braking and forced braking.
In one embodiment, when the dc fan 10 is controlled to enter the dynamic braking start mode, the dc fan 10 is controlled to enter the zero voltage braking; when the zero-voltage braking makes the speed of the direct current fan 10 greater than the sixth speed threshold value omega6And when the speed is not greater than the fifth speed threshold omega 5, the direct current fan 10 is controlled to enter forced braking.
Wherein the first speed threshold ω1>Fifth speed threshold ω5>Sixth speed threshold ω6>Fourth speed threshold ω4. Fifth speed threshold ω5Being positive, sixth speed threshold ω6Is a negative number. Fifth speed threshold ω5For positive numbers, which may be understood as positive rotational speeds, a sixth speed threshold ω6Negative numbers are understood to mean reverse rotational speeds. In some examples, the fifth speed threshold ω5It may be 25RPM, or 30RPM, or a value between 25RPM and 30 RPM. Sixth speed threshold ω6May be-25 RPM, or-30 RPM, or a value between-30 RPM and-25 RPM. Preferably, the fifth speed threshold ω5And a sixth speed threshold ω6Are the same in absolute value.
In another embodiment, when the dc fan 10 is controlled to enter the dynamic braking start mode, the dc fan 10 is controlled to enter the zero voltage braking; and when the zero-voltage brake reaches a time threshold value, controlling the direct current fan 10 to enter forced brake. In some examples, the time threshold may be 1s, or 10s, or a value between 1s and 10 s.
Referring to fig. 11, the zero voltage braking includes: setting a fixed decoupling angle and setting the output d-axis voltage and q-axis voltage to be zero; and controlling the three upper bridge arms to be switched on simultaneously and the three lower bridge arms to be switched off simultaneously, or controlling the three upper bridge arms to be switched off simultaneously and the three lower bridge arms to be switched on simultaneously, so that the direct current fan 10 is in a working state of short connection of three-phase windings.
In this way, power can be generated by the rotation speed of the dc fan 10 itself, so that the generated current is generated on the three-phase winding of the dc fan 10 to realize dynamic braking. The zero-voltage braking has large braking torque, is faster to brake, and has better effect than zero-current braking (zero-current braking refers to mechanical friction of a rotor of a direct-current fan and does not generate braking torque). In one example, the fixed decoupling angle is set to zero. In the example of FIG. 11, a position sensorless estimation algorithm may be employed to estimate the flux linkage angle and speed of the DC fan 10.
Referring to fig. 12, the forcible braking includes: setting given d-axis current and q-axis current and forcibly setting a decoupling angle; the rate of change of the decoupling angle is gradually reduced from the speed of the dc fan 10 obtained at the end of the zero-voltage braking to zero.
It is understood that setting a given d-axis current and a given q-axis current means that the given d-axis current and the given q-axis current are given according to a certain rule, for example, the d-axis current and the q-axis current gradually rise from zero to a set value, respectively, and then remain unchanged. The set values of the d-axis current and the q-axis current may be the same or different. In other embodiments, the forced braking process may set the given q-axis current to zero, with the given d-axis current gradually increasing from zero to a set value; or the given d-axis current may be set to zero and the given q-axis current may be ramped up from zero to the set value. The rate of change of the decoupling angle is indicative of the angular velocity. At the end of the zero voltage braking, the speed of the dc fan 10 may be obtained by estimation. And forcibly setting a decoupling angle, and taking the speed of the direct current fan 10 obtained at the zero-voltage braking ending moment as an initial value of the change rate of the decoupling angle when ending the zero-voltage braking and entering the forced braking, wherein the change rate of the decoupling angle is gradually reduced to zero from the initial value. In the example of FIG. 12, a position sensorless estimation algorithm may be employed to estimate the flux linkage angle and speed of the DC fan 10.
It should be noted that the decoupling angle is an angle used for decoupling in vector control of the dc fan.
Referring to fig. 13, when the dc fan 10 is in the direct closed-loop start mode, the dc fan 10 is controlled to enter the closed-loop operation. Specifically, in the direct closed-loop start mode, i.e., when the forward rotational speed of the dc fan 10 is high, the closed-loop operation is directly switched in, and the positioning process and the open-loop operation do not need to be performed.
In some examples, the switching speed threshold may be 100RPM, or 600RPM, or a value between 100RPM and 600 RPM.
The start control method of the direct current fan 10 according to the above embodiment estimates the initial speed of the direct current fan 10 based on the zero voltage injection, and can calculate the initial speed ω 0 and the rotation direction from the three-phase current of the direct current fan 10. Further, and according to different initial speeds ω0The direct current fan 10 is controlled to enter different starting modes, so that the starting success rate of the direct current fan 10 under the condition of abnormal weather (wind blowing and rain falling) can be improved, the fault abnormity is reduced, and the user experience is improved.
Referring to fig. 14, the start control device 100 of the dc fan 10 according to the embodiment of the invention includes a detection module 110, a comparison module 120 and a control module 130. The detection module 110 is configured to obtain three-phase currents of the dc fan 10 based on the zero-voltage injection, and determine an initial speed ω of the dc fan 10 according to the three-phase currents of the dc fan 100And a direction of rotation. The comparison module 120 is used for determining an initial speed ω of the dc fan 100In relation to a preset speed threshold. The control module 130 is used for controlling the DC fan 10 according to the initial speed omega0In relation to the preset speed threshold, the dc fan 10 is controlled to enter different start modes.
That is, the start control method of the direct current fan 10 according to the above embodiment can be realized by the start control device 100 of the direct current fan 10 according to the present embodiment. Wherein, the step S10 may be implemented by the detection module 110, the step S20 may be implemented by the comparison module 120, and the step S30 may be implemented by the control module 130.
In the start-up control device 100 for the dc fan 10 according to the above-described embodiment, the initial speed of the dc fan 10 is estimated based on the zero-voltage injection, and the initial speed ω can be calculated from the three-phase current of the dc fan 100And a rotating blockAccordingly, the control method is relatively simple and easy to implement. Further, the direct current fan 10 is controlled to enter different starting modes according to different initial speeds ω 0, so that the starting success rate of the direct current fan 10 under the condition of abnormal weather (wind blowing and rain falling) can be improved, the abnormal faults are reduced, and the user experience is improved.
Referring to fig. 1 and 14, in one embodiment, the start-up control device 100 may be disposed in the control chip 30 shown in fig. 1, and it is understood that the start-up control device 100 is integrated in the control chip 30. That is, the detection module 110, the comparison module 120, and the control module 130 may all be integrated in the control chip 30. In other embodiments, a portion of the start-up control device 100 may be integrated into a control chip, and another portion of the start-up control device 100 may be disposed in another chip or device. In other embodiments, the start-up control device 100 may also be fabricated as a separate chip or device for controlling the start-up of the dc fan 10.
It should be noted that the explanation and the advantageous effects of the start control method of the direct current fan 10 according to the above embodiment are also applicable to the start control device 100 of the direct current fan 10 according to the present embodiment, and are not detailed here to avoid redundancy.
In some embodiments, the predetermined speed threshold comprises a first speed threshold ω1Second speed threshold ω2Third speed threshold ω3And a fourth speed threshold ω4. The control module 130 is used when the initial speed ω is0Greater than a first speed threshold ω1When the direct current fan 10 is started, the direct current fan is controlled to enter a direct closed loop starting mode; or when the initial speed ω is0Greater than a second speed threshold ω2And is not greater than a first speed threshold ω1When the energy consumption braking starting mode is started, the direct current fan 10 is controlled to enter the energy consumption braking starting mode; or when the initial speed ω is0Greater than a third speed threshold ω3And not greater than a second speed threshold ω2When the direct current fan 10 is started, the direct current fan is controlled to enter a normal positioning starting mode; or when the initial speed ω is0Greater than a fourth speed threshold ω4And is not greater than a third speed threshold ω3When the direct current fan 10 is controlled to enter the dynamic braking startingA mode; or when the initial speed ω is0Not greater than a fourth speed threshold ω4At the same time, the initial speed ω of the dc fan 10 is re-determined0And controls the dc blower 10 to be in a waiting state. Wherein the first speed threshold ω1>Second speed threshold ω2>Third speed threshold ω3>Fourth speed threshold ω4(ii) a First speed threshold ω1And a second speed threshold ω2Being positive, third speed threshold ω3And a fourth speed threshold ω4Is a negative number.
In some embodiments, the control module 130 is configured to, when the dc fan 10 is in the normal positioning start mode, control the dc fan 10 to perform a positioning process of current injection, and then control the dc fan 10 to enter an open-loop operation, and when the current rotation speed of the dc fan 10 reaches the switching speed threshold during the open-loop operation, control the dc fan 10 to enter the closed-loop operation. Or the control module 130 is configured to, when the direct current fan 10 is in the dynamic braking start mode, control the direct current fan 10 to perform the dynamic braking process first, then control the direct current fan 10 to enter the open-loop operation, and when the current rotation speed of the direct current fan 10 reaches the switching speed threshold during the open-loop operation, control the direct current fan 10 to enter the closed-loop operation. Or the control module 130 is configured to control the dc fan 10 to enter the closed-loop operation when the dc fan 10 is in the direct closed-loop start mode.
In some embodiments, the detection module 110 is configured to obtain three-phase currents of the dc fan 10 based on the zero-voltage injection, and determine the initial speed ω of the dc fan 10 according to the zero-crossing time of the three-phase currents of the dc fan 10 in the two-phase stationary coordinate system and the sign of the current signal0And a direction of rotation.
In some embodiments, the detection module 110 is configured to obtain three-phase current of the dc fan 10 during zero-voltage injection; converting the three-phase current to a two-phase static coordinate system to obtain a first current and a second current; and calculating the initial speed omega of the direct current fan 10 according to the first current and the second current0And a direction of rotation.
In some embodiments, the detection module 110 is configured to detect the first current and the second current based on the first current and the second currentThe initial speed omega of the direct current fan 10 is calculated according to the time difference value of two adjacent zero-crossing points0And determines the rotation direction of the dc fan 10 according to the signs of the first and second currents at the zero-crossing time.
In some embodiments, the detection module 110 is configured to determine the initial speed ω of the dc fan 10 when the difference between two adjacent zero-crossing times is greater than a preset value0Is zero.
In some embodiments, a driving module 20 is connected to the dc fan 10, and the driving module 20 includes three upper bridge arms and three lower bridge arms connected. Each bridge arm comprises a power switch tube, and the power switch tubes are reversely connected with diodes in parallel. The control module 130 is configured to control the three upper bridge arms to be turned on at the same time and the three lower bridge arms to be turned off at the same time, or control the three upper bridge arms to be turned off at the same time and the three lower bridge arms to be turned on at the same time, so that the dc fan 10 is in a short-circuited working state of the three-phase winding to achieve zero-voltage injection.
In some embodiments, the detection module 110 is coupled to the current sensor 50. The current sensor 50 is configured to detect a bus current of the dc fan 10, and the detection module 110 is configured to obtain the bus current of the dc fan 10 and calculate a three-phase current of the dc fan 10 according to the bus current of the dc fan 10. Or the current sensor 50 is configured to detect two-phase currents of the dc fan 10, and the detection module 110 is configured to obtain the two-phase currents of the dc fan 10 and calculate three-phase currents of the dc fan 10 according to the two-phase currents of the dc fan 10. Or the current sensor 50 is used for detecting the three-phase current of the dc fan 10, and the detection module 110 is used for acquiring the three-phase current of the dc fan 10.
Referring to fig. 15, an outdoor unit 1100 according to an embodiment of the present invention includes a dc fan 10 and a start control device 100 of the dc fan 10 according to any of the embodiments.
In the outdoor unit 1100 of the above embodiment, the initial speed of the dc fan 10 is estimated based on the zero voltage injection, and the initial speed ω can be calculated from the three-phase currents of the dc fan 100And the rotation direction, the control method is simple and easy to realize. Further, and according to different initial speeds ω0Controlling the DC fan 10 into different start modesThe starting success rate of the direct current fan 10 under the condition of abnormal weather (wind blowing and rain falling) can be improved, the fault abnormality is reduced, and the user experience is improved.
It should be noted that the explanation and the advantageous effects of the start-up control method of the dc fan 10 and the start-up control device 100 according to the above embodiments are also applied to the outdoor unit 1100 according to the present embodiment, and are not described in detail here to avoid redundancy.
Referring to fig. 15, an air conditioner 1000 according to an embodiment of the present invention includes the direct current fan 10 and the start control device 100 of the direct current fan 10 according to any one of the embodiments. That is, the air conditioner 1000 includes the outdoor unit 1100 of the above embodiment, and the outdoor unit 1100 includes the dc fan 10 and the start control device 100 of the dc fan 10.
In the air conditioner 1000 according to the above embodiment, the initial speed of the dc fan 10 is estimated based on the zero voltage injection, and the initial speed ω can be calculated from the three-phase current of the dc fan 100And the rotation direction, the control method is simple and easy to realize. Further, and according to different initial speeds ω0The direct current fan 10 is controlled to enter different starting modes, so that the starting success rate of the direct current fan 10 under the condition of abnormal weather (wind blowing and rain falling) can be improved, the fault abnormity is reduced, and the user experience is improved.
It should be noted that the explanation and the advantageous effects of the start control method of the direct current fan 10 and the start control device 100 according to the above embodiments are also applicable to the air conditioner 1000 according to the present embodiment, and are not detailed here to avoid redundancy.
Specifically, the air conditioner 1000 further includes an indoor unit 1200, and the outdoor unit 1100 is connected to the indoor unit 1200. In one example, the air conditioner 1000 may be a variable frequency air conditioner.
It is understood that, in some embodiments, the indoor unit 1200 may also be provided with the direct current fan 10 and the start control device 100 of the direct current fan 10 of any of the above embodiments.
In some embodiments, when the outdoor unit 1100 has the dc fan 10, the start control device 100 of the dc fan 10 may be installed on the outdoor unit 1100, or installed on the indoor unit 1200, or a part of the start control device 100 is installed on the outdoor unit 1100 and another part of the start control device 100 is installed on the indoor unit 1200, and the two parts of the start control device 100 may communicate with each other by wire or wirelessly or by a combination of wire and wireless.
In some embodiments, when the indoor unit 1200 has the dc fan 10, the start control device 100 of the dc fan 10 may be installed on the indoor unit 1200, or installed on the outdoor unit 1100, or a part of the start control device 100 is installed on the outdoor unit 1100, and another part of the start control device 100 is installed on the indoor unit 1200, and these two parts of the start control device 100 may communicate with each other by wire or wirelessly or by a combination of wire and wireless.
In addition, the start control device 100 and the dc fan 10 may be controlled by wire or wireless or a combination of wire and wireless.
In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processing module-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of embodiments of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (24)

1. A starting control method of a direct current fan is characterized by comprising the following steps:
based on zero voltage injection, obtaining three-phase current of the direct current fan, obtaining first current and second current according to three-phase current conversion of the direct current fan, and determining initial speed and rotation direction of the direct current fan according to the first current and the second current;
determining the relation between the initial speed of the direct current fan and a preset speed threshold;
controlling the direct current fan to enter different starting modes according to the relation between the initial speed of the direct current fan and the preset speed threshold,
based on zero voltage injection, obtaining three-phase current of the direct current fan, obtaining first current and second current according to three-phase current conversion of the direct current fan, and determining initial speed and rotation direction of the direct current fan according to the first current and the second current, wherein the method comprises the following steps:
based on zero voltage injection, obtaining the three-phase current of the direct current fan, determining the initial speed and the rotation direction of the direct current fan according to the current zero-crossing time and the current signal sign of the first current and the second current obtained by converting the three-phase current of the direct current fan under a two-phase static coordinate system,
wherein the initial rotational speed of the dc fan = 60/(pole pair number 4 (T2-T1)), T1 is a time when the first current crosses zero and T2 is a time when the second current crosses zero after the first current crosses zero, or T1 is a time when the second current crosses zero and T2 is a time when the first current crosses zero after the second current crosses zero.
2. The start-up control method of claim 1, wherein the preset speed threshold comprises a first speed threshold, and wherein controlling the dc fan to enter different start-up modes according to a relationship between an initial speed of the dc fan and the preset speed threshold comprises:
when the initial speed is larger than the first speed threshold value, controlling the direct current fan to enter a direct closed loop starting mode;
wherein the first speed threshold is a positive number.
3. A start-up control method as claimed in claim 2, wherein said preset speed threshold comprises a second speed threshold, and controlling said dc fan to enter different start-up modes according to a relationship between an initial speed of said dc fan and said preset speed threshold comprises:
when the initial speed is greater than the second speed threshold and not greater than the first speed threshold, controlling the direct current fan to enter an energy-consumption braking starting mode;
wherein the first speed threshold > the second speed threshold, the second speed threshold being a positive number.
4. A start-up control method as claimed in claim 3, wherein the preset speed threshold comprises a third speed threshold, and the controlling the dc fan to enter different start-up modes according to the relationship between the initial speed of the dc fan and the preset speed threshold comprises:
when the initial speed is greater than the third speed threshold and not greater than the second speed threshold, controlling the direct current fan to enter a normal positioning starting mode;
wherein the second speed threshold > the third speed threshold, the third speed threshold being a negative number.
5. The start-up control method of claim 4, wherein the preset speed threshold comprises a fourth speed threshold, and the controlling the DC fan to enter different start-up modes according to the relationship between the initial speed of the DC fan and the preset speed threshold comprises:
when the initial speed is greater than the fourth speed threshold and not greater than the third speed threshold, controlling the direct current fan to enter the dynamic braking starting mode;
when the initial speed is not greater than the fourth speed threshold, re-detecting the initial speed of the direct current fan, and controlling the direct current fan to be in a waiting state;
wherein the third speed threshold > the fourth speed threshold; the fourth speed threshold is negative.
6. The startup control method according to claim 5, characterized in that the startup control method includes:
when the direct current fan is in the normal positioning starting mode, firstly controlling the direct current fan to pass through a positioning process of current injection, then controlling the direct current fan to enter open-loop operation, and when the current rotating speed of the direct current fan reaches a switching speed threshold value during the open-loop operation, controlling the direct current fan to enter closed-loop operation;
when the direct current fan is in the energy consumption braking starting mode, firstly controlling the direct current fan to pass through the energy consumption braking process, then controlling the direct current fan to enter open-loop operation, and when the current rotating speed of the direct current fan reaches the switching speed threshold value during the open-loop operation, controlling the direct current fan to enter closed-loop operation;
and when the direct current fan is in the direct closed-loop starting mode, controlling the direct current fan to enter closed-loop operation.
7. The start-up control method according to claim 1, wherein the obtaining of the three-phase current of the dc fan based on the zero-voltage injection and the determining of the initial speed and the rotation direction of the dc fan according to the current zero-crossing time and the current signal sign of the first current and the second current obtained by the down-conversion of the three-phase current of the dc fan in the two-phase stationary coordinate system comprise:
acquiring three-phase current of the direct current fan when zero voltage is injected;
converting the three-phase current to the two-phase static coordinate system to obtain the first current and the second current;
and calculating the initial speed and the rotation direction of the direct current fan according to the first current and the second current.
8. The startup control method according to claim 7, wherein calculating an initial speed and a rotational direction of the dc fan from the first current and the second current includes:
calculating the initial speed of the direct current fan according to the time difference value of two adjacent zero-crossing points of the first current and the second current, and judging the rotation direction of the direct current fan according to the signs of the first current and the second current at the zero-crossing time.
9. The startup control method according to claim 8, characterized in that the startup control method includes:
and when the difference value of the zero-crossing time of the two adjacent times is larger than a preset value, determining that the initial speed of the direct current fan is zero.
10. The start-up control method according to claim 1, wherein the dc fan is connected with a driving module, the driving module includes three upper bridge arms and three lower bridge arms connected, each of the bridge arms includes a power switching tube, the power switching tube is connected with a diode in anti-parallel, and the zero-voltage injection includes:
and controlling the three upper bridge arms to be switched on simultaneously and the three lower bridge arms to be switched off simultaneously, or controlling the three upper bridge arms to be switched off simultaneously and the three lower bridge arms to be switched on simultaneously, so that the direct current fan is in a working state of short circuit of a three-phase winding to realize the zero voltage injection.
11. The start-up control method of claim 1, wherein obtaining three-phase current of the dc fan comprises one of:
detecting the bus current of the direct current fan, and calculating the three-phase current of the direct current fan according to the bus current of the direct current fan;
detecting two-phase current of the direct current fan, and calculating three-phase current of the direct current fan according to the two-phase current of the direct current fan;
and detecting the three-phase current of the direct current fan.
12. A starting control device of a direct current fan is characterized by comprising:
the detection module is used for acquiring three-phase current of the direct current fan based on zero voltage injection, obtaining first current and second current according to three-phase current conversion of the direct current fan, and determining initial speed and rotation direction of the direct current fan according to the first current and the second current;
the comparison module is used for determining the relation between the initial speed of the direct current fan and a preset speed threshold;
a control module for controlling the DC fan to enter different starting modes according to the relation between the initial speed of the DC fan and the preset speed threshold,
the detection module is used for acquiring the three-phase current of the direct current fan based on zero voltage injection, determining the initial speed and the rotation direction of the direct current fan according to the current zero-crossing time and the current signal sign of the first current and the second current obtained by converting the three-phase current of the direct current fan under a two-phase static coordinate system,
wherein the initial rotational speed of the dc fan = 60/(pole pair number 4 (T2-T1)), T1 is a time when the first current crosses zero and T2 is a time when the second current crosses zero after the first current crosses zero, or T1 is a time when the second current crosses zero and T2 is a time when the first current crosses zero after the second current crosses zero.
13. The activation control device of claim 12, wherein the preset speed threshold comprises a first speed threshold, the control module to:
when the initial speed is larger than the first speed threshold value, controlling the direct current fan to enter a direct closed loop starting mode;
wherein the first speed threshold is a positive number.
14. The launch control device of claim 13, wherein the preset speed threshold comprises a second speed threshold, the control module being configured to:
when the initial speed is greater than the second speed threshold and not greater than the first speed threshold, controlling the direct current fan to enter an energy-consumption braking starting mode;
wherein the first speed threshold > the second speed threshold, the second speed threshold being a positive number.
15. The activation control device of claim 14, wherein the preset speed threshold comprises a third speed threshold, the control module to:
when the initial speed is greater than the third speed threshold and not greater than the second speed threshold, controlling the direct current fan to enter a normal positioning starting mode;
wherein the second speed threshold > the third speed threshold, the third speed threshold being a negative number.
16. The activation control device of claim 15, wherein the preset speed threshold comprises a fourth speed threshold, the control module to:
when the initial speed is greater than the fourth speed threshold and not greater than the third speed threshold, controlling the direct current fan to enter the dynamic braking starting mode;
when the initial speed is not greater than the fourth speed threshold, re-detecting the initial speed of the direct current fan, and controlling the direct current fan to be in a waiting state;
wherein the third speed threshold > the fourth speed threshold; the fourth speed threshold is negative.
17. The activation control device of claim 16, wherein the control module is to:
when the direct current fan is in the normal positioning starting mode, firstly controlling the direct current fan to pass through a positioning process of current injection, then controlling the direct current fan to enter open-loop operation, and when the current rotating speed of the direct current fan reaches a switching speed threshold value during the open-loop operation, controlling the direct current fan to enter closed-loop operation;
when the direct current fan is in the energy consumption braking starting mode, firstly controlling the direct current fan to pass through the energy consumption braking process, then controlling the direct current fan to enter open-loop operation, and when the current rotating speed of the direct current fan reaches the switching speed threshold value during the open-loop operation, controlling the direct current fan to enter closed-loop operation;
and when the direct current fan is in the direct closed-loop starting mode, controlling the direct current fan to enter closed-loop operation.
18. The activation control device of claim 12, wherein the detection module is to:
acquiring three-phase current of the direct current fan when zero voltage is injected;
converting the three-phase current to the two-phase static coordinate system to obtain the first current and the second current;
and calculating the initial speed and the rotation direction of the direct current fan according to the first current and the second current.
19. The startup control device of claim 18, wherein the detection module is configured to calculate an initial speed of the dc fan according to a difference between two adjacent zero-crossings of the first current and the second current, and determine a rotation direction of the dc fan according to signs of the first current and the second current at the zero-crossings.
20. The startup control device of claim 19, wherein the detection module is configured to determine that the initial speed of the dc fan is zero when the difference between the two adjacent zero-crossings is greater than a predetermined value.
21. The start-up control device of claim 12, wherein the dc fan is connected with a driving module, the driving module includes three upper bridge arms and three lower bridge arms connected to each other, each of the three bridge arms includes a power switching tube, the power switching tubes are connected in anti-parallel with diodes, and the control module is configured to control the three upper bridge arms to be turned on at the same time and the three lower bridge arms to be turned off at the same time, or control the three upper bridge arms to be turned off at the same time and the three lower bridge arms to be turned on at the same time, so that the dc fan is in a working state where three-phase windings are shorted to achieve the zero-voltage injection.
22. The start control device of claim 12, wherein the detection module is connected to a current sensor, the current sensor is configured to detect a bus current of the dc fan, and the detection module is configured to obtain the bus current of the dc fan and calculate a three-phase current of the dc fan according to the bus current of the dc fan; or
The current sensor is used for detecting two-phase current of the direct current fan, and the detection module is used for acquiring the two-phase current of the direct current fan and calculating three-phase current of the direct current fan according to the two-phase current of the direct current fan; or
The current sensor is used for detecting the three-phase current of the direct current fan, and the detection module is used for acquiring the three-phase current of the direct current fan.
23. An outdoor unit comprising a dc fan and the startup control device of the dc fan as recited in any one of claims 12 to 22.
24. An air conditioner characterized by comprising a direct current fan and the start control device of the direct current fan according to any one of claims 12 to 22.
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