CN106452200A - Typhoon power protection circuit of outdoor fan in air conditioner, outdoor unit and air conditioner - Google Patents
Typhoon power protection circuit of outdoor fan in air conditioner, outdoor unit and air conditioner Download PDFInfo
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- CN106452200A CN106452200A CN201611050960.4A CN201611050960A CN106452200A CN 106452200 A CN106452200 A CN 106452200A CN 201611050960 A CN201611050960 A CN 201611050960A CN 106452200 A CN106452200 A CN 106452200A
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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
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
- H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by short-circuit or resistive braking
Abstract
The invention discloses a typhoon power protection circuit of an outdoor fan in an air conditioner, an outdoor unit and an air conditioner. The circuit comprises a switch unit and a frequency converter, wherein the switch unit comprises at least two option switches; the switch contacts of at least two option switches move between a first position and a second position; the frequency converter comprises a three-phase inversion unit and a control unit; a direct-current end of the three-phase inversion unit is connected with a high-voltage direct-current power supply; the three-phase output ends of the three-phase inversion unit are connected with a motor in the outdoor fan; when the air conditioner starts work, the control unit controls the switch contacts of at least two option switches at the first position so that the three-phase output ends are connected with the motor; and when the air conditioner stops, the control unit controls the switch contacts of at least two option switches at the second position, then any two-phase output ends of the three-phase output ends are suspended, the motor is in short connection with two-phase windings corresponding to any two-phase output ends, and the electronic devices of the air conditioner are protected from damage in typhoon.
Description
Technical field
The present invention relates to air-conditioner technical field, particularly to a kind of typhoon power protection electricity of outdoor fan in air-conditioner
Road, a kind of off-premises station and a kind of air-conditioner.
Background technology
Air-conditioner in correlation technique is operated by transducer drive outdoor fan.In the related, in air-conditioner
If outdoor fan runs into exogenous wind (typhoon or violent typhoon), the blower fan being under stopped status also can rotate.If
Exogenous wind wind speed is larger, then the rotating speed of motor is higher, and motor itself produces larger induced voltage, the regeneration electricity that induced voltage causes
Pressure if it exceeds the pressure voltage of electronic device (such as electric capacity) in converter, then can cause electronic device to damage, cause economy
Loss, Consumer's Experience is poor.
In addition, if exogenous wind wind speed is excessive, also can cause much secondary problems, for example, outdoor fan wind wheel intensity is not enough
The wind wheel blade that causes damages problem, the bearing life problem of outdoor fan, overcurrent cause the startup demagnetization problem of motor,
Overvoltage problem of electric regenerative etc., reduces the reliability of product.
Content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.For this reason, the present invention
One purpose is to propose a kind of typhoon power protecting circuit of outdoor fan in air-conditioner, and this protection circuit can solve typhoon
The damage of the electronic device causing, can avoid the wind-induced secondary problem of platform simultaneously.
Further object is that proposing a kind of off-premises station.A further object of the present invention is to propose a kind of sky
Adjust device.
For reaching above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of typhoon power supply of outdoor fan in air-conditioner
Protection circuit, including：Switch element, described switch element includes at least two selecting switch, described at least two selecting switch
Switch contact move between the first location and the second location；Converter, described converter includes three-phase inversion unit and control
Unit processed, the DC terminal of described three-phase inversion unit is defeated in order to connect high-voltage DC power supply, the three-phase of described three-phase inversion unit
Go out end in order to connect the motor in described outdoor fan, wherein, when described air-conditioner startup work, described control unit controls
The switch contact of described at least two selecting switch is in described primary importance, so that described three-phase output end is connected to described electricity
Machine；When described air-conditioner is shut down, it is described that described control unit controls the switch contact of described at least two selecting switch to be in
The second position, so that arbitrarily biphase defeated with described in the hanging and described motor of any two phase output terminals of described three-phase output end
Go out to hold corresponding two phase winding short circuits.
The typhoon power protecting circuit of outdoor fan in the air-conditioner proposing according to embodiments of the present invention, when air-conditioner starts
During work, control unit controls the switch contact of at least two selecting switch to be in primary importance, so that three-phase inversion unit
Three-phase output end is connected to motor, and when air-conditioner is shut down, control unit controls at the switch electric shock of at least two selecting switch
In the second position, so that any two phase output terminals of three-phase output end are vacantly and corresponding with any two phase output terminals in motor
Two phase winding short circuits.It follows that the protection circuit according to embodiments of the present invention motor when meeting with typhoon is subject to braking moment
Effect, thus reducing the rotating speed of outdoor fan, the regenerative voltage of the converter being caused with the induced voltage reducing motor, it is to avoid platform
Wind-induced electronic device damages, and reduces economic loss, improves Consumer's Experience.And it is possible to avoid wind wheel intensity deficiency to make
The wind wheel blade becoming damages, it is to avoid the wind-induced bearing impact of platform, it is to avoid the startup demagnetization problem of the motor that overcurrent causes, and carries
The high reliability of product.
According to one embodiment of present invention, when described switch element include first to three selecting switch when, described
One to the 3rd selecting switch is arranged between described three-phase output end and described motor, wherein, when the described first to the 3rd selection
When the switch contact of switch is in described primary importance, described converter is connected with described motor to drive described motor operation；
When the switch contact of the described first to the 3rd selecting switch is in the described second position, the three-phase windings short circuit of described motor,
It is kept completely separate between described converter and described motor.
According to one embodiment of present invention, when described switch element includes the first and second selecting switch, described
One and second selecting switch be arranged in described three-phase output end between any two phase output terminals and described motor, wherein, work as institute
When stating the switch contact of the first and second selecting switch and being in described primary importance, described converter is connected with described motor to drive
Move described motor operation；When the switch contact of described first and second selecting switch is in the described second position, described motor
In two phase winding short circuits corresponding with described any two phase output terminals, electrical separation between described converter and described motor.
According to one embodiment of present invention, described three-phase inversion unit includes the first to the 6th switching tube, first switch
Pipe and second switch pipe constitute the first brachium pontis, the 3rd switching tube and the 4th switching tube composition the second brachium pontis, the 5th switching tube and the
Six switching tubes constitute the 3rd brachium pontis, and described first brachium pontis has primary nodal point, and described second brachium pontis has secondary nodal point, and described the
Three brachium pontis have the 3rd node, and described primary nodal point, described secondary nodal point and described 3rd contact constitute described three-phase output end.
According to a specific embodiment of the present invention, the described first to the 6th switching tube can be IGBT pipe or MOSFET pipe.
For reaching above-mentioned purpose, a kind of off-premises station that another aspect of the present invention embodiment proposes, including described air-conditioner
The typhoon power protecting circuit of middle outdoor fan.
The off-premises station proposing according to embodiments of the present invention, by the typhoon power protection electricity of above-mentioned outdoor fan of air conditioner
Road, when meeting with typhoon, motor is acted on by braking moment, thus reducing the rotating speed of outdoor fan, to reduce the faradism of motor
Press the regenerative voltage of the converter causing, it is to avoid the wind-induced electronic device of platform damages, reduce economic loss, improve user's body
Test.And it is possible to avoid the wind wheel blade that wind wheel intensity deficiency causes to damage, it is to avoid the wind-induced bearing impact of platform, it is to avoid mistake
The startup demagnetization problem of the motor that electric current causes, improves the reliability of product.
For reaching above-mentioned purpose, a kind of air-conditioner that another aspect of the invention embodiment proposes, including described off-premises station.
The air-conditioner proposing according to embodiments of the present invention, by above-mentioned off-premises station, when meeting with typhoon, motor is braked
Torque, thus reducing the rotating speed of outdoor fan, the regenerative voltage of the converter being caused with the induced voltage reducing motor, keep away
Exempt from the wind-induced electronic device of platform to damage, reduce economic loss, improve Consumer's Experience.And it is possible to avoid wind wheel intensity not
The wind wheel blade that foot causes damages, it is to avoid the wind-induced bearing impact of platform, it is to avoid the startup demagnetization of the motor that overcurrent causes is asked
Topic, improves the reliability of product.
Brief description
Fig. 1 is that the square frame of the typhoon power protecting circuit of outdoor fan in air-conditioner according to embodiments of the present invention is illustrated
Figure；
Fig. 2 is that the circuit of the typhoon power protecting circuit of outdoor fan in air-conditioner according to an embodiment of the invention is former
Reason figure；
Fig. 3 is the circuit of the typhoon power protecting circuit of outdoor fan in air-conditioner in accordance with another embodiment of the present invention
Schematic diagram；
Fig. 4 a is the structural representation of the wind wheel blade of outdoor fan in air-conditioner according to an embodiment of the invention；
Fig. 4 b is the structural representation of the wind wheel blade of outdoor fan in air-conditioner in accordance with another embodiment of the present invention；
Fig. 5 is the induced voltage of outdoor fan in air-conditioner according to one specific embodiment of the present invention, faradic
Waveform diagram；
Fig. 6 is in air-conditioner according to one specific embodiment of the present invention between the revolution of outdoor fan and exogenous wind wind speed
Relation schematic diagram；
Fig. 7 be in air-conditioner according to one specific embodiment of the present invention outdoor fan induced voltage, faradic current
Relation schematic diagram and winding copper loss and exogenous wind wind speed between；
Fig. 8 is the block diagram of off-premises station according to embodiments of the present invention；And
Fig. 9 is the block diagram of air-conditioner according to embodiments of the present invention.
Reference：
Switch element 10, converter 20, high-voltage DC power supply 30 and motor 40；
At least two selecting switch 101, three-phase inversion unit 201 and control unit 202；
First switch pipe Q1 to the 6th switching tube Q6；First choice switchs S1 to the 3rd selecting switch S3；
First choice switchs S1 ＇ and the second selecting switch S2 ＇；
The typhoon power protecting circuit 200 of outdoor fan and air-conditioner 300 in off-premises station 100, air-conditioner.
Specific embodiment
Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings, wherein from start to finish
The element that same or similar label represents same or similar element or has same or like function.Below with reference to attached
The embodiment of figure description is exemplary it is intended to be used for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the typhoon power protection electricity of outdoor fan in the air-conditioner of embodiment of the present invention proposition to be described
Road, off-premises station and air-conditioner.
Fig. 1 is that the square frame of the typhoon power protecting circuit of outdoor fan in air-conditioner according to embodiments of the present invention is illustrated
Figure.As shown in figure 1, this typhoon power protecting circuit includes：Switch element 10 and converter 20.
Wherein, switch element 10 includes at least two selecting switch 101, the switch contact of at least two selecting switch 101
Move between the first location and the second location；Converter 20 includes three-phase inversion unit 201 and control unit 202, three contraries
, in order to connect high-voltage DC power supply 30, the three-phase output end of three-phase inversion unit 201 is in order to junction chamber for the DC terminal becoming unit 201
Motor 40 in outer blower fan, wherein, when air-conditioner startup work, control unit 202 controls at least two selecting switch 101
Switch contact is in primary importance, so that three-phase output end is connected to motor 40；When air-conditioner is shut down, control unit 202 is controlled
The switch contact making at least two selecting switch 101 is in the second position, so that any two phase output terminals of three-phase output end hang
Two phase winding short circuits corresponding with any two phase output terminals in sky and motor 40.
Specifically, when air-conditioner startup work, control unit 202 controls the switch of at least two selecting switch 101
Contact is in primary importance, so that three-phase output end is connected to motor 40, three-phase inversion unit 201 carries to high-voltage DC power supply 30
For unidirectional current carry out inversion and process to export three-phase alternating current, and the three-phase alternating current after inversion is processed is supplied to motor
40, think that motor 40 is powered；When air-conditioner quits work, control unit 202 controls the switch of at least two selecting switch 101
Contact is in the second position so that any two phase output terminals of three-phase output end are hanging and motor 40 in arbitrarily biphase output
Hold corresponding two phase winding short circuits, between the winding of short circuit, form conducting loop.When meeting with typhoon, the wind wheel band of outdoor fan
The rotor of galvanic electricity machine 40 rotates, and the magnetic field of the rotor cutting motor 40 of motor 40 produces induced voltage, and the winding in motor 40
On flow through faradic current, now, motor 40 operates in generating state.According to left hand rule, when motor 40 rotates, in motor 40
Winding on form braking moment, the rotating speed of suppression motor 40, finally, motor 40 rotate acting all consume short circuit around
In group, that is, say, the rotation acting Wm of motor 40 is equal with the copper loss Wm ＇ of motor 40.
So, in the presence of exogenous wind and internal detent torque, motor 40 produces relatively low induced voltage, and motor 40
Rotating speed Ns is persistently limited by braking moment, and motor 40 is slowly rotated with relatively low rotating speed Ns, without stopping completely.
Thus, the protection circuit according to embodiments of the present invention motor when meeting with typhoon is acted on by braking moment, thus
Reduce the rotating speed of outdoor fan, the regenerative voltage of the converter causing with the induced voltage reducing motor, it is to avoid platform is wind-induced
Electronic device damages, and reduces economic loss, improves Consumer's Experience.And it is possible to avoid the wind wheel that wind wheel intensity deficiency causes
Blade damage, it is to avoid the wind-induced bearing impact of platform, it is to avoid the startup demagnetization problem of the motor that overcurrent causes, improves product
Reliability.
In an embodiment of the present invention, as shown in Figures 2 and 3, three-phase inversion unit 201 includes first switch pipe Q1 to the 6th
Switching tube Q6, first switch pipe Q1 and second switch pipe Q2 constitute the first brachium pontis, the 3rd switching tube Q3 and the 4th switching tube Q4 structure
The second brachium pontis, the 5th switching tube Q5 and the 6th switching tube Q6 is become to constitute the 3rd brachium pontis, the first brachium pontis has primary nodal point, the second bridge
Arm has secondary nodal point, and the 3rd brachium pontis has the 3rd node, and primary nodal point, secondary nodal point and the 3rd contact constitute three-phase output
End.
According to a specific embodiment of the present invention, first switch pipe Q1 to the 6th switching tube Q6 can for IGBT pipe or
MOSFET manages.
Specifically, in air-conditioner startup work, control unit 202 controls the switch of at least two selecting switch 101
Contact is in primary importance I, and the driver element of converter 10 drives first switch pipe Q1 to the 6th switching tube Q6 according to default rule
Rule turns on and off, and carries out inversion process with the unidirectional current that high-voltage DC power supply 30 is provided, and the three-phase after inversion is processed
Alternating current is supplied to motor 40 by three-phase output end A, B, C, thinks that motor 40 is powered.When air-conditioner quits work, first
Switching tube Q1 to the 6th switching tube Q6 turns off, and control unit 202 controls the switch contact of at least two selecting switch 101 to be in the
Two position II so that any two phase output terminals of three-phase output end A, B, C are hanging and motor 40 in any two phase output terminals pair
The two phase winding short circuits answered, to constitute conducting loop.
According to one embodiment of present invention, as shown in Fig. 2 switching S1 to the 3rd when switch element 10 includes first choice
During selecting switch S3, first choice switch S1 to the 3rd selecting switch S3 is separately positioned on three-phase output end A, B, C and motor 40
Between, wherein, when the switch contact that first choice switchs S1 to the 3rd selecting switch S3 is in primary importance I, converter 20
Connect with motor 40 and run with motor 40；When the switch contact that first choice switchs S1 to the 3rd selecting switch S3 is in the
During two position II, the three-phase windings short circuit of motor 40, it is kept completely separate between converter 20 and motor 40.
Specifically, in air-conditioner startup work, control unit 202 controls first choice switch S1 to the 3rd to select to open
Close S3 and be in primary importance I, now, the A phase output terminal of three-phase inversion unit 201 switchs S1 and motor 40 by first choice
U phase winding is connected, and the B phase output terminal of three-phase inversion unit 201 passes through the V phase winding phase of the second selecting switch S2 and motor 40
Even, the C phase output terminal of three-phase inversion unit 201 is connected with the W phase winding of motor 40 by the 3rd selecting switch S3, converter 20
The unidirectional current that high-voltage DC power supply 30 is provided carries out inversion to export three-phase alternating current, and three-phase alternating current is supplied to motor
40, run with motor 40.When air-conditioner is shut down, converter 20 quits work, and control unit 202 controls first choice to open
Close S1 to the 3rd selecting switch S3 and be in second position II, now, three-phase windings (i.e. U phase winding, V phase winding and the W of motor 40
Phase winding) short circuit, constitute conducting and be kept completely separate between loop, and converter 20 and motor 40.If experience typhoon, outdoor wind
The rotor of the wind wheel drive motor 40 of machine rotates, and all flows through faradic current Im in the three-phase windings of motor 40, and the turning of motor 40
Working power P1 when dynamic is equal with the copper loss P1 ＇ within motor during three-phase shortcircuit 40.
Below the operation principle of the typhoon power protecting circuit of the embodiment of the present invention is made a concrete analysis of and verified.
In an embodiment of the present invention, the induced voltage constant Ke of motor 40 can be by motor 40 in rotating speed Ns=1000rpm
When phase voltage Vu (Vv or Vw) virtual value, that is, induced voltage E determine, and meet formula Ke=1000*E/Ns.
With reference to Fig. 4 a and 4b, with typhoon wind speed v=40m/s, wind wheel model ZL-700*202* of outdoor fan
As a example 20-3N, externally the rotating speed Ns (rpm) of wind-induced motor 40 is derived.
1) there is no exogenous wind, motor belt motor wind symptom wheel rotates
As shown in fig. 4 a, wind wheel is arranged on motor 40, and when not having exogenous wind in the work process of air-conditioner, and motor 40 carries
It is assumed that the air quantity that wind wheel produces is Q (m during the rotation of wind symptom wheel3/ s), the area of wind wheel is S (m2), the blade number of wind wheel is nh
Individual, the height of wind wheel is d (m), and the radical length of the overall dimensions of wind wheel is a (m), and the radical length of wind wheel installation portion is b
M (), air quantity Q and typhoon wind speed v meets following formula：
Wherein, air quantity Q meets following formula：
According to model ZL-700*202*20-3N of wind wheel, a=700mm, b=155.9mm, d=202mm, nh=
3, the area of wind wheelFollowing formula can be obtained in conjunction with formula (1) and (2)：
Above-mentioned parameter is substituted into respectively formula (2) and formula (3) understands,
When the rotating speed Ns of motor 40 is 1000rpm, the wind speed v0=0.606 of the wind wheel of model ZL-700*202*20-3N
× 16.67=10.1 (m/s).
2) when motor 40 unloaded (i.e. the three-phase windings of motor 40 are all hanging), exogenous wind acts on wind wheel blade
As shown in Figure 4 b, when exogenous wind acts on the wind wheel blade of outdoor fan, wind wheel drive motor 40 rotates,
On the one hand, because the shape of wind wheel blade is so that exogenous wind directed force F 1 is converted into rotating force F2 and the work perpendicular to ground
Firmly F3, leads to wind speed to reduce；On the other hand, the heat exchanger of off-premises station is equivalent to wind-powered electricity generation resistance, also results in wind speed and reduces.Cause
This, when meeting with typhoon, the wind speed that exogenous wind acts on wind wheel blade reduces, and the conversion efficiency of wind speed can be η, wherein, conversion effect
The specification of the heat exchanger of the shape of rate η and wind wheel blade and off-premises station is relevant.
According to a specific embodiment of the present invention, conversion efficiency η can be 70%.If exogenous wind wind speed v=10.1m/s,
The then rotating speed Ns ≈ 1000rpm × 70%=700rpm of motor 40.When motor 40 rotates freely under exogenous wind effect, motor 40
Rotating speed Ns be directly proportional to exogenous wind wind speed v that is to say, that when exogenous wind demeanour v be 40m/s when, the rotating speed of motor 40
3) in the three-phase windings short circuit of motor 40, exogenous wind acts on wind wheel blade
According to acting formula, working power P1 when motor 40 rotates meets following formula (1)：
Wherein, F (N) is winding stress, and l (m) is displacement, and v (m/s) is speed, and Tr is that (braking turns motor torque
Square), r is the radius of rotary motion, and ω is angular velocity of rotation, and Ns (rpm) is the rotating speed of motor, wherein, Tr=F × r, v=ω
×r.
The copper loss P1 ＇ within motor 40 during three-phase shortcircuit meets following formula (2)：
P1 ＇=3 × R × Im2(2)
Wherein, R (Ω) is the resistance value of the single-phase winding of motor 40, and Im (A) is the faradic current of motor 40.
Further, under exogenous wind effect, the induced voltage that motor 40 produces is under E (V) and faradic current Im (A) meets
Row relational expression (3) and (4)：
Wherein, Ke (V/krpm) is induced voltage constant, and L (H) is the inductance of machine winding, and p is the number of pole-pairs of motor.
When the winding of motor 40 is short-circuited, the winding of motor 40 flows through faradic current Im, according to left hand rule, electricity
Form, on the winding of machine 40, the rotating speed Ns that braking moment Tr suppresses motor 40, lead to the rotating speed Ns of motor 40 relatively low, therefore, formula
(4) following formula (5) can be reduced to：
Due to motor 40 rotation when working power P1 equal with the copper loss P1 ＇ within motor during three-phase shortcircuit 40, can
Obtain relation shown in following formula (6)：
P1=P1 ＇, that is,
Can be obtained according to formula (3), (5) and (6),
From above formula (7), if it is known that resistance value R of single-phase winding of the torque Tr of exogenous wind, motor 40 and motor
Induced voltage constant Ke, then can calculate the revolution Ns of motor 40.
As an example it is assumed that the output of motor 40 is 750W, induced voltage constant Ke is 57.158 (V/krpm), list
Resistance value R of phase winding is 1.2 Ω, for calculating the rotating speed Ns that exogenous wind wind speed is motor 40 during 40m/s, only need to be according to calculating exogenous wind
Torque Tr.
Specifically, if the output P1 of motor 40 be 750W, motor 40 drive wind wheel rotation when, motor 40 turn
Fast Ns is 1300rpm, and wind speed v is 10.1m/s, is understood according to formula (1), motor torque
In an embodiment of the present invention, useful to wind speed v wind wheel blade efficiency can be for 30% that is to say, that working as wind speed v be 10.1m/
During s, exogenous wind torque Tr ＇ can be 5.51 × 30%=1.65 (N m).
More specifically, when the exogenous wind wind speed v acting on wind wheel blade is 40m/s, due to wind-powered electricity generations such as heat exchangers
The effect of resistance, conversion efficiency η of wind speed can be 70%, that is, say, the theoretical wind speed acting on wind wheel blade can be
28m/s.Due to square being directly proportional of torque and wind speed v of exogenous wind, therefore, when exogenous wind wind speed v is 40m/s, exogenous wind torqueOn the other hand, when exogenous wind drive motor 40 rotates, the wind wheel useful to wind speed v
Vane efficiency can be 30%, therefore, exogenous wind torque Tr=12.7 × 30%=3.81 (N m) of being finally used effectively.
Tr=3.81 (N m) is substituted into formula (7) can obtain, the rotating speed of motor 40 I.e. blower fan is slowly rotated with the rotating speed on the right side of turning left each second 0.8.Wherein,
So, when exogenous wind wind speed is 40m/s, by switch element 10 by the three-phase windings short circuit of motor 40, can be by
The rotating speed of motor is reduced under Light ConditionThus reducing the rotating speed of outdoor fan, wind wheel intensity can be avoided not enough
The wind wheel blade causing damages, it is to avoid the wind-induced bearing impact of platform, it is to avoid the startup demagnetization problem of the motor that overcurrent causes,
Improve the reliability of product.
In addition, rotating speed Ns=48.9rpm is substituted into formula (3) can obtain, induced voltage And then, E=2.79V is substituted into formula (5) can be obtained, faradic currentTherefore,
Copper loss P1 ＇=3 × R × Im2=3 × 1.2 × 2.332=19.5W.When the rated power of motor 40 is 750W, motor 40 is just
Electric current when often running is about 3.36A, higher than phase current during motor 40 three-phase shortcircuit, therefore, copper loss P1 ＇ and faradic current Im
All not over the tolerance value of motor 40.That is, meet with exogenous wind when, by switch element 10 by the three-phase of motor 40 around
Group short circuit does not result in machine winding overcurrent and burns.
It should be noted that during the analysis of the embodiment of the present invention, because the rotating speed Ns of motor 40 is less, can neglect
Omit the inductance L of machine winding, but, in formal calculating, faradic current Im need to be calculated according to formula (4).
According to a specific embodiment of the present invention, when exogenous wind wind speed is 40m/s, the rotating speed Ns=of motor 40
48.9rpm, now, the induced voltage E of motor 40, the waveform of faradic current Im are as shown in Figure 5.Wherein, each phase winding of motor 40
Faradic current between differ 120 °, have phase contrast between the induced voltage E of any one phase winding of motor 40, faradic current Im
(such as 15.59 °).
It should be noted that the phase contrast between induced voltage E, faradic current Im is to be caused by the inductance L of machine winding
's.
According to another specific embodiment of the present invention, during by switch element 10 by the three-phase windings short circuit of motor 40,
Relation between the revolution Ns of motor 40 and exogenous wind wind speed v can as shown in fig. 6, the induced voltage E of motor 40, faradic current Im and
Relation between winding copper loss P1 ＇ and exogenous wind wind speed v can be as shown in Figure 7.
According to another embodiment of the invention, as shown in figure 3, when switch element 10 include first choice switch S1 ＇ and
During the second selecting switch S2 ＇, first choice switch S1 ＇ and the second selecting switch S2 ＇ is arranged on arbitrarily biphase in three-phase output end
Outfan (such as B phase output terminal and C phase output terminal), and motor 40 between, wherein, selects when first choice switchs S1 ＇ and second
When the switch contact of switch S2 ＇ is in primary importance I, converter 20 is connected with motor 40 and is run with motor 40；When first
When the switch contact of selecting switch S1 ＇ and the second selecting switch S2 ＇ is in second position II, with arbitrarily biphase output in motor 40
Hold corresponding two phase winding short circuits, electrical separation between converter 20 and motor 40.
As an example it is assumed that first choice switch S1 ＇ and the second selecting switch S2 ＇ is arranged on B, C two phase output terminal and electricity
Between machine 40, in air-conditioner startup work, control unit 202 controls at first choice switch S1 ＇ and the second selecting switch S2 ＇
In primary importance I, now, the A phase output terminal of three-phase inversion unit 201 is directly connected with the U phase winding of motor 40, three-phase inversion
The B phase output terminal of unit 201 is switched S1 ＇ by first choice and is connected with the V phase winding of motor 40, the C of three-phase inversion unit 201
Phase output terminal is connected with the W phase winding of motor 40 by the second selecting switch S2 ＇, and converter 20 provides to high-voltage DC power supply 30
Unidirectional current carry out inversion to export three-phase alternating current, and three-phase alternating current is supplied to motor 40, is run with motor 40.
When air-conditioner is shut down, converter 20 quits work, and control unit 202 controls first choice switch S1 ＇ and the second selecting switch
S2 ＇ is in second position II, now, the V phase winding of motor 40 and W phase winding short circuit, and electricity between converter 20 and motor 40
From that is to say, that there is not conducting loop between converter 20 and motor 40 in edema caused by disorder of QI.If experience typhoon, outdoor fan
The rotor of wind wheel drive motor 40 rotates, and flows through faradic current Im in the V phase winding of motor 40 and W phase winding.
Specifically, from unlike three-phase shortcircuit, when meeting with typhoon, if motor 40 occurs line to line fault, flow
Cross the current imbalance of motor 40 three-phase windings, braking moment Tr is not definite value, due to motor 40 rotation when working power
P1 is equal with the copper loss P2 ＇ within motor during line to line fault 40, can suppress the rotating speed Ns of motor 40 after braking moment Tr is average.
More specifically, during line to line fault the conducting loop of motor 40 include two phase windings (such as V phase winding and W phase around
Group), if motor 40 occurs three-phase shortcircuit identical with the revolution Ns of motor during line to line fault 40, alternate sense during line to line fault
Answer the induced voltage E that voltage E ＇ is during three-phase shortcircuitTimes, and, the resistance R ＇ and inductance L ＇ in conducting loop are that three-phase is short
2 times of resistance R during road and inductance L, therefore, during line to line fault, the faradic current Im ＇ of motor 40 is faradism during three-phase shortcircuit
Stream Im'sTimes.
So, the copper loss within motor 40 during line to line faultBiphase
When short-circuit, the copper loss P2 ＇ within motor 40 is the half of copper loss P1 ＇ during three-phase shortcircuit within motor 40.Therefore, single when controlling
When first 202 controlled motor 40 occurs line to line fault, equally can suppress the rotating speed Ns of motor 40.
According to a specific embodiment of the present invention, when typhoon power protecting circuit adopts three-phase shortcircuit to suppress motor speed
When, switch element 10 may include the relay of 3 pole 2 contact or the relay of 31 pole 2 contacts, when typhoon power protection
When circuit adopts line to line fault suppression motor speed, switch element 10 may include the relay of 2 pole 2 contact.Wherein, relay
One contact of device can be used as primary importance I, and another contact of relay can be used as second position II.
Thus, motor speed is suppressed using line to line fault, circuit structure can be simplified, reduce production cost, reduce pcb board
Area occupied.
To sum up, in the air-conditioner proposing according to embodiments of the present invention, the typhoon power protecting circuit of outdoor fan, works as air-conditioning
During device startup work, control unit controls the switch contact of at least two selecting switch to be in primary importance, so that three-phase inversion
The three-phase output end of unit is connected to motor, and when air-conditioner is shut down, control unit controls the switch of at least two selecting switch
Electric shock is in the second position so that any two phase output terminals of three-phase output end are hanging and motor in any two phase output terminals
Corresponding two phase winding short circuits.It follows that the protection circuit according to embodiments of the present invention motor system when meeting with typhoon
Dynamic torque acts on, thus reducing the rotating speed of outdoor fan, the regenerative voltage of the converter being caused with the induced voltage reducing motor,
Avoid the wind-induced electronic device of platform to damage, reduce economic loss, improve Consumer's Experience.And it is possible to avoid wind wheel intensity
The wind wheel blade that deficiency causes damages, it is to avoid the wind-induced bearing impact of platform, it is to avoid the startup demagnetization of the motor that overcurrent causes
Problem, improves the reliability of product.
Fig. 8 is the block diagram of off-premises station according to embodiments of the present invention.As shown in figure 8, this off-premises station 100 includes sky
Adjust the typhoon power protecting circuit 200 of outdoor fan in device.
To sum up, the off-premises station proposing according to embodiments of the present invention, is protected by the typhoon power supply of above-mentioned outdoor fan of air conditioner
Protection circuit, when meeting with typhoon, motor is acted on by braking moment, thus reducing the rotating speed of outdoor fan, to reduce the sense of motor
Answer the regenerative voltage of the converter that voltage causes, it is to avoid the wind-induced electronic device of platform damages, reduce economic loss, improve use
Family is experienced.And it is possible to avoid the wind wheel blade that wind wheel intensity deficiency causes to damage, it is to avoid the wind-induced bearing impact of platform, keep away
Exempt from the startup demagnetization problem of the motor that overcurrent causes, improve the reliability of product.
Fig. 9 is the block diagram of air-conditioner according to embodiments of the present invention.As shown in figure 9, this air-conditioner 300 includes room
Outer machine 100.
To sum up, the air-conditioner proposing according to embodiments of the present invention, by above-mentioned off-premises station, when meeting with typhoon, motor is subject to
Braking moment acts on, thus reducing the rotating speed of outdoor fan, the regeneration electricity of the converter being caused with the induced voltage reducing motor
Pressure, it is to avoid the wind-induced electronic device of platform damages, reduces economic loss, improves Consumer's Experience.And it is possible to avoid wind wheel strong
The wind wheel blade that degree deficiency causes damages, it is to avoid the wind-induced bearing impact of platform, it is to avoid the startup of the motor that overcurrent causes is moved back
Magnetic problem, improves the reliability of product.
In describing the invention it is to be understood that term " " center ", " longitudinal ", " horizontal ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " up time
The orientation of instruction such as pin ", " counterclockwise ", " axial ", " radially ", " circumferential " or position relationship be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must
Must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two, three
Individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
Connect or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limit unless otherwise clear and definite.For those of ordinary skill in the art
For, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score permissible
It is the first and second feature directly contacts, or the first and second features pass through intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel
Close and combine.
Although embodiments of the invention have been shown and described above it is to be understood that above-described embodiment is example
Property it is impossible to be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (7)
1. in a kind of air-conditioner outdoor fan typhoon power protecting circuit it is characterised in that include：
Switch element, described switch element includes at least two selecting switch, the switch contact of described at least two selecting switch
Move between the first location and the second location；
Converter, described converter includes three-phase inversion unit and control unit, the DC terminal of described three-phase inversion unit in order to
Connect high-voltage DC power supply, the three-phase output end of described three-phase inversion unit in order to connect the motor in described outdoor fan, its
In,
When described air-conditioner startup work, described control unit controls the switch contact of described at least two selecting switch to be in
Described primary importance, so that described three-phase output end is connected to described motor；
When described air-conditioner is shut down, it is described that described control unit controls the switch contact of described at least two selecting switch to be in
The second position, so that arbitrarily biphase defeated with described in the hanging and described motor of any two phase output terminals of described three-phase output end
Go out to hold corresponding two phase winding short circuits.
2. in air-conditioner according to claim 1 the typhoon power protecting circuit of outdoor fan it is characterised in that when described
Switch element include first to three selecting switch when, the described first to the 3rd selecting switch be arranged on described three-phase output end with
Between described motor, wherein,
When the switch contact of the described first to the 3rd selecting switch is in described primary importance, described converter and described motor
Connection is to drive described motor operation；
When the switch contact of the described first to the 3rd selecting switch is in the described second position, the three-phase windings of described motor are short
Connect, be kept completely separate between described converter and described motor.
3. in air-conditioner according to claim 1 the typhoon power protecting circuit of outdoor fan it is characterised in that when described
When switch element includes the first and second selecting switch, described first and second selecting switch are arranged in described three-phase output end
Between any two phase output terminals and described motor, wherein,
When the switch contact of described first and second selecting switch is in described primary importance, described converter and described motor
Connection is to drive described motor operation；
When the switch contact of described first and second selecting switch is in the described second position, any with described in described motor
The corresponding two phase winding short circuits of two phase output terminals, electrical separation between described converter and described motor.
4. in the air-conditioner according to any one of claim 1-3 outdoor fan typhoon power protecting circuit, its feature
It is, described three-phase inversion unit includes the first to the 6th switching tube, first switch pipe constitutes the first brachium pontis with second switch pipe,
3rd switching tube and the 4th switching tube constitute the second brachium pontis, the 5th switching tube and the 6th switching tube composition the 3rd brachium pontis, and described the
One brachium pontis has primary nodal point, and described second brachium pontis has secondary nodal point, and described 3rd brachium pontis has the 3rd node, and described first
Node, described secondary nodal point and described 3rd contact constitute described three-phase output end.
5. in air-conditioner according to claim 4 the typhoon power protecting circuit of outdoor fan it is characterised in that described
One to the 6th switching tube is IGBT or MOSFET.
6. a kind of off-premises station is it is characterised in that include outdoor fan in the air-conditioner according to any one of claim 1-5
Typhoon power protecting circuit.
7. a kind of air-conditioner is it is characterised in that include off-premises station according to claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611050960.4A CN106452200B (en) | 2016-11-22 | 2016-11-22 | Typhoon power protecting circuit, outdoor unit and the air conditioner of outdoor fan in air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611050960.4A CN106452200B (en) | 2016-11-22 | 2016-11-22 | Typhoon power protecting circuit, outdoor unit and the air conditioner of outdoor fan in air conditioner |
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| CN106452200A true CN106452200A (en) | 2017-02-22 |
| CN106452200B CN106452200B (en) | 2019-02-19 |
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| CN201611050960.4A Active CN106452200B (en) | 2016-11-22 | 2016-11-22 | Typhoon power protecting circuit, outdoor unit and the air conditioner of outdoor fan in air conditioner |
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| CN107959448A (en) * | 2018-01-22 | 2018-04-24 | 安图实验仪器(郑州)有限公司 | Stepper motor brake system based on relay control |
| CN107994545A (en) * | 2017-12-12 | 2018-05-04 | 深圳市英威腾电气股份有限公司 | The protection circuit and electric system of a kind of wind turbine |
| CN108599128A (en) * | 2018-07-09 | 2018-09-28 | 珠海格力电器股份有限公司 | A kind of excess voltage protection and compressor with the circuit and air conditioner |
| CN110989481A (en) * | 2019-10-25 | 2020-04-10 | 红云红河烟草(集团)有限责任公司 | Energy-saving control system for leaf and stem separation production line |
| CN112212460A (en) * | 2020-08-28 | 2021-01-12 | 海信（山东）空调有限公司 | Air conditioner and shutdown control method |
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| CN112212460A (en) * | 2020-08-28 | 2021-01-12 | 海信（山东）空调有限公司 | Air conditioner and shutdown control method |
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| Publication number | Publication date |
|---|---|
| CN106452200B (en) | 2019-02-19 |
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