CN209458171U - Draught fan control circuit and air conditioner - Google Patents
Draught fan control circuit and air conditioner Download PDFInfo
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- CN209458171U CN209458171U CN201920172806.7U CN201920172806U CN209458171U CN 209458171 U CN209458171 U CN 209458171U CN 201920172806 U CN201920172806 U CN 201920172806U CN 209458171 U CN209458171 U CN 209458171U
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Abstract
It includes: fan drive circuit that the utility model, which discloses a kind of draught fan control circuit and air conditioner, the circuit, is used for output drive signal；The controlled end of blower IPM module, blower IPM module is connect with fan drive circuit, and the fault-signal output end of blower IPM module and the feedback end of fan drive circuit connect, and the output end of blower IPM module is connect with blower；Blower IPM module, according to the driving signal driving blower work of fan drive circuit output, and when detecting fan trouble, output fault detection signal to fan drive circuit；Interference signal absorbing circuit, input terminal are connect with the fault-signal output end of blower IPM module；Interference signal absorbing circuit absorbs the interference signal on the fault-signal output end of blower IPM module and the feedback end connection line of fan drive circuit.The utility model improves the anti-electromagnetic interference capability of fan drive circuit, improves the EMC performance of draught fan control circuit.
Description
Technical field
The utility model relates to air-conditioning technical field, in particular to a kind of draught fan control circuit and air conditioner.
Background technique
In the electrical equipment that air conditioner, refrigerator etc. are equipped with frequency converter, electrical appliance shell is installed in the electric-controlled plate of frequency converter
It is likely present other electric-controlled plates and device when internal, in shell, is likely present spatial electromagnetic interference signal shell is intracorporal,
The easy circuit-wiring layer or ground wire etc. by electric-controlled plate of electromagnetic interference signal is sealed in other circuit devcies, and is influenced
The EMC performance of complete machine.
Utility model content
The main purpose of the utility model is to propose a kind of draught fan control circuit and air conditioner, it is intended to improve blower driving electricity
The anti-electromagnetic interference capability on road improves the EMC performance of draught fan control circuit.
To achieve the above object, the utility model proposes a kind of draught fan control circuit, the draught fan control circuit includes:
Fan drive circuit is used for output drive signal；
The controlled end of blower IPM module, the blower IPM module is connect with the fan drive circuit, the blower IPM
The fault-signal output end of module is connect with the feedback end of the fan drive circuit, the output end of the blower IPM module with
Blower connection；The blower IPM module, the driving signal for being exported according to the fan drive circuit, drives the blower
Work, and when detecting the fan trouble, output fault detection signal to the fan drive circuit；
Interference signal absorbing circuit, the failure of the input terminal of the interference signal absorbing circuit and the blower IPM module
Signal output end connection；The interference signal absorbing circuit, for absorb the fault-signal output end of the blower IPM module with
Interference signal in the feedback end connection line of the fan drive circuit.
Optionally, the quantity of the quantity of the interference signal absorbing circuit and the blower IPM module is two；
The input terminal of two interference signal absorbing circuits and the fault-signal output end of two blower IPM modules
It connects one to one.
Optionally, the interference signal absorbing circuit includes first capacitor, and the first end of the first capacitor is described dry
The input terminal of signal absorption circuit is disturbed, the second end of the first capacitor is connect with the first DC power supply.
Optionally, the interference signal absorbing circuit includes the second capacitor, and the first end of second capacitor is described dry
Disturb the input terminal of signal absorption circuit, the second end ground connection of second capacitor.
Optionally, the draught fan control circuit further includes fault detection signal delay circuit, and the fault detection signal prolongs
The input terminal of slow circuit is connect with the fault-signal output end of the blower IPM module；The fault detection signal delay circuit,
For when receiving the fault detection signal of blower IPM module output, after postponing to the fault detection signal
Output.
Optionally, the draught fan control circuit further includes pull-up resistor, one end of the pull-up resistor and the blower IPM
The fault-signal output end of module connects, and the other end of the pull-up resistor is connect with the first DC power supply.
Optionally, the draught fan control circuit further includes current-limiting resistance, and the current-limiting resistance is arranged in series in the blower
Between the fault-signal output end of IPM module and the feedback end of the fan drive circuit.
Optionally, the blower IPM module includes:
Inverter bridge；
Current foldback circuit for flowing through the electric current of blower in detection, and is detecting the electric current greater than predetermined current
When value, output overcurrent detects signal；And
The control terminal of inverter bridge driving circuit, the inverter bridge driving circuit is connect with the controlled end of the inverter bridge；Institute
Driving signal of the inverter bridge driving circuit for exporting according to the fan drive circuit is stated, the inverter bridge is driven to work；With
And when receiving the over-current detection signal, output fault detection signal to the fan drive circuit.
Optionally, the draught fan control circuit further includes temperature overheating protection circuit, temperature overheating protection circuit with
The inverter bridge driving circuit connection；
The temperature overheating protects circuit, for detecting the inverter bridge temperature, and is detecting the inverter bridge temperature
Temperature protection signal is exported when greater than preset temperature threshold；
The inverter bridge driving circuit, is also used to when receiving the temperature protection signal, exports fault detection signal
To the fan drive circuit.
The utility model also proposes a kind of air conditioner, including draught fan control circuit as described above；
The draught fan control circuit includes: fan drive circuit, is used for output drive signal；Blower IPM module, the wind
The controlled end of machine IPM module is connect with the fan drive circuit, the fault-signal output end of the blower IPM module with it is described
The feedback end of fan drive circuit connects, and the output end of the blower IPM module is connect with blower；The blower IPM module is used
In the driving signal exported according to the fan drive circuit, the blower is driven to work, and is detecting the blower event
When barrier, output fault detection signal to the fan drive circuit；Interference signal absorbing circuit, the interference signal absorbing circuit
Input terminal connect with the fault-signal output end of the blower IPM module；The interference signal absorbing circuit, for absorbing
State the interference signal on the fault-signal output end of blower IPM module and the feedback end connection line of the fan drive circuit.
The utility model is by setting fan drive circuit, and output drive signal is to blower IPM module, so that blower
The driving signal that IPM module is exported according to fan drive circuit, driving blower work, in the process of work, blower IPM module
Also when detecting the fan trouble of detection blower fan exports fault detection signal to the fan drive circuit, so that blower
Driving circuit is when receiving fault detection signal, or control blower IPM module is slowed down, and stops output drive signal, with control
Blower processed stops working.The utility model also passes through setting interference signal absorbing circuit, and interference signal absorbing circuit is set to wind
On the loop wire that the fault-signal output end of machine IPM module and the feedback end of the fan drive circuit are formed, to absorb the wind
Interference signal on the fault-signal output end of machine IPM module and the feedback end connection line of the fan drive circuit.This reality
With it is novel solve due between fan drive circuit and blower IPM module in wiring relatively far apart so that blower drive
Loop between dynamic circuit and blower IPM module is larger, and electromagnetic interference signal is caused to export through loop to fan drive circuit,
So that the problem of fan drive circuit malfunctions.The utility model improves the anti-electromagnetic interference capability of fan drive circuit, mentions
The high EMC performance of draught fan control circuit.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the functional block diagram of one embodiment of the utility model draught fan control circuit；
Fig. 2 is the electrical block diagram of one embodiment of the utility model draught fan control circuit；
Fig. 3 is the electrical block diagram of another embodiment of the utility model draught fan control circuit；
Fig. 4 is the electrical block diagram of one embodiment of blower IPM module in Fig. 1.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 10 | Fan drive circuit | 23 | Inverter bridge driving circuit |
| 20 | Blower IPM module | 30 | Interference signal absorbing circuit |
| 21 | Inverter bridge | 40 | Fault detection signal delay circuit |
| 22 | Current foldback circuit |
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that if related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding,
Afterwards ...), then directionality instruction is only used for explaining opposite between each component under a certain particular pose (as shown in the picture)
Positional relationship, motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, if relating to the description of " first ", " second " etc. in the utility model embodiment, " first ", " the
Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning
The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one
A this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Based on personnel can be realized, this technical side will be understood that when the combination of technical solution appearance is conflicting or cannot achieve
The combination of case is not present, also not within the protection scope of the requires of the utility model.
If there is term "and/or" herein, this is only a kind of incidence relation for describing affiliated partner, and expression can deposit
In three kinds of relationships, for example, A and/or B, can indicate: individualism A exists simultaneously A and B, these three situations of individualism B.
In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
The utility model proposes a kind of draught fan control circuits, are suitable for frequency conversion type air conditioning, frequency conversion type washing machine, frequency conversion type ice
In the electrical equipments such as case, it can be adapted in the integral air conditioners such as movable air conditioner, window air conditioner, dehumidifier humidifier, especially
It is suitable in multi-split air conditioner.Below for convenience of understanding, in citing, it is illustrated for being applied to air-conditioning.
Referring to Fig.1, in an embodiment of the utility model, which includes:
Fan drive circuit 10 is used for output drive signal；
The controlled end of blower IPM module 20, the blower IPM module 20 is connect with the fan drive circuit 10, described
The fault-signal output end of blower IPM module 20 is connect with the feedback end of the fan drive circuit 10, the blower IPM module
20 output end is connect with blower；The blower IPM module 20, the driving letter for being exported according to the fan drive circuit 10
Number, drive the blower to work, and when detecting the fan trouble, output fault detection signal to the blower drives
Circuit 10；
Interference signal absorbing circuit 30, the input terminal of the interference signal absorbing circuit 30 and the blower IPM module 20
Fault-signal output end connection；The interference signal absorbing circuit 30, the failure for absorbing the blower IPM module 20 are believed
Interference signal in the feedback end connection line of number output end and the fan drive circuit 10.
In the present embodiment, draught fan control circuit be can be set on the electric-controlled plate of air-conditioner outdoor unit, generally be gone back on electric-controlled plate
It is provided with rectification circuit and pfc circuit, rectification circuit can be rectifier bridge stack, or formed using four independent diodes
Rectification circuit is realized.Output is to pfc circuit after the AC power source of access is converted to direct current by rectification circuit, to carry out power
Factor adjustment.Fan drive circuit 10 is optional to be realized using integrated IC, and fan drive circuit 10 is for driving blower IPM
The work of (Intelligent Power Module, intelligent power module) module.Fan drive circuit 10 can drive a wind
Machine IPM module 20 works, and two blower IPM modules 20 can also be driven to work simultaneously, specifically can be according to the type of air conditioner
It is configured, it is optional that two 20 works of blower IPM module are driven using fan drive circuit 10 simultaneously in multi-split air conditioner
Make.
Fan drive circuit 10 is optional to be realized using signal processing chips such as single-chip microcontroller, DSP, and fan drive circuit 10 is wrapped
The software algorithm program that driving blower IPM module 20 works is contained, so that load blower was exported according to fan drive circuit 10
Driving signal operation.
Blower IPM module 20 is used for the direct current for exporting pfc circuit according to the driving signal that fan drive circuit 10 exports
Output is to wind wheel motor after electricity is converted to alternating current, to drive wind wheel motor to work.Certainly in other embodiments, IPM module
It can be also used for driving the frequency converter and various inverters of other motors, and be applied to frequency control, metallurgical machinery, electric power is led
Draw, in the fields such as frequency-conversion domestic electric appliances such as servo-drive and air-conditioning.In blower IPM module 20, it is generally integrated current foldback circuit
22, overvoltage crowbar, thermal-shutdown circuit etc., when detecting that motor occurs in overcurrent, over-voltage or blower IPM module 20
Power tube temperature anomaly when, then control wind wheel decelerating through motor, or shut down work, and feed back to by fault-signal output end
Fan drive circuit 10, so that fan drive circuit 10 controls the deceleration of blower IPM module 20 when receiving fault detection signal,
Or stop output drive signal, it is stopped working with controlling blower.
Interference signal absorbing circuit 30 is set to the fault-signal output end and fan drive circuit 10 of blower IPM module 20
Feedback end between, the electromagnetic interference signal higher than fault detection signal frequency can be absorbed, to avoid in route interference letter
Number triggering fan drive circuit 10 malfunction.
It should be noted that the components such as contactor, relay are further typically provided on electric-controlled plate, blower IPM module 20
It is generally integrated power switch tube, these contactors, relay and power switch tube at work, are easy to produce electromagnetic interference letter
Number, cause the EMC of electric-controlled plate to interfere.Also, when electric-controlled plate is installed in air-conditioner shell, other are likely present in shell
Electric-controlled plate and device are likely present spatial electromagnetic interference signal in air-conditioner shell, and electromagnetic interference signal is easy to pass through
Circuit-wiring layer or ground wire on electric-controlled plate etc. are sealed in other circuit devcies, and influence the EMC performance of complete machine.Due to wind
Between drive circuit 10 and blower IPM module 20 relatively far apart in wiring, so that fan drive circuit 10 and blower
Loop between IPM module 20 is larger, may there is parasitic capacitance, parasitic inductance etc. on loop.These electromagnetism are dry in this way
Disturbing signal may be exported by the loop between blower IPM module 20 and fan drive circuit 10 to fan drive circuit 10
Feedback end causes fan drive circuit 10 receiving electromagnetic interference signal, so that 20 failure of false triggering blower IPM module is protected
Shield, and stop output drive signal, it either controls blower IPM module 20 and slows down or stop working.
To solve the above-mentioned problems, the utility model is by setting fan drive circuit 10, and output drive signal is to wind
Machine IPM module 20, so that the driving signal that blower IPM module 20 is exported according to fan drive circuit 10, driving blower work,
During work, also when the detecting the fan trouble of detection blower fan of blower IPM module 20, output fault detection signal is extremely
The fan drive circuit 10, so that fan drive circuit 10 is when receiving fault detection signal, or control blower IPM mould
Block 20 slows down, and stops output drive signal, is stopped working with controlling blower.The utility model also passes through setting interference signal and absorbs
Circuit 30, interference signal absorbing circuit 30 are set to the fault-signal output end and blower driving electricity of blower IPM module 20
On the loop wire that the feedback end on road 10 is formed, driven with absorbing fault-signal output end and the blower of the blower IPM module 20
Interference signal in the feedback end connection line of dynamic circuit 10.The utility model is solved due to fan drive circuit 10 and blower
Between IPM module 20 relatively far apart in wiring, so that loop between fan drive circuit 10 and blower IPM module 20
It is larger, and electromagnetic interference signal is caused to export through loop to fan drive circuit 10, so that fan drive circuit 10 malfunctioned
Problem.The utility model improves the anti-electromagnetic interference capability of fan drive circuit 10, improves the EMC of draught fan control circuit
Energy.
Referring to Fig.1, in one embodiment, the quantity of the interference signal absorbing circuit 30 and the blower IPM module 20
Quantity be two；
The input terminal of two interference signal absorbing circuits 30 and the fault-signal of two blower IPM modules 20 are defeated
Outlet connects one to one.
It is understood that be usually provided with two wind wheel motors in multi-split air conditioner, accordingly the present embodiment
Blower IPM module 20 is also configured as two, and fan drive circuit 10 can drive two blower IPM modules 20 to work simultaneously.Wind
Drive circuit 10 also has there are two feedback end, dry connect respectively with the fault-signal output end of two blower IPM modules 20
Two input terminals for disturbing signal absorption circuit 30, which are also corresponded with the fault-signal output end of two blower IPM modules 20, to be connected
It connects, to be absorbed to the interference signal on each self loop.
Referring to Fig. 2, in one embodiment, interference signal absorbing circuit 30 is optional to be realized using capacitor, also, capacitor
The frequency for the interference signal that quantity and capacity can be measured according to experiment is configured.
Specifically, the interference signal absorbing circuit 30 includes first capacitor (C11, C12), the first capacitor (C11,
C12 first end) be the interference signal absorbing circuit 30 input terminal, the second end of the first capacitor (C11, C12) with
First DC power supply VCC connection.
In the present embodiment, one end of first capacitor (C11, C12) and the feedback end of fan drive circuit 10 and blower IPM mould
The common end of the fault-signal output end of block 20 connects, and the other end of first capacitor (C11, C12) and the first DC power supply VCC connect
It connects.Wherein, the first DC power supply VCC can be the power supply of fan drive circuit 10.When the feedback of fan drive circuit 10
There are when electromagnetic interference signal in the connection line of the fault-signal output end of end and blower IPM module 20, electromagnetic interference signal
Pass through connection line, the first capacitor of the fault-signal output end of the feedback end and blower IPM module 20 of fan drive circuit 10
The low-impedance path that (C11, C12) and the first DC power supply VCC are formed flows into the first DC power supply VCC, and by the first direct current
Power supply VCC absorbs.The setting of first capacitor (C11, C12) can scurry into blower to avoid the interference signal in loop and drive electricity
Road 10 causes fan drive circuit 10 to malfunction.
Referring to Fig. 3, in addition, the interference signal absorbing circuit 30 includes the second capacitor (C21, C22), second capacitor
The first end of (C21, C22) be the interference signal absorbing circuit 30 input terminal, the second of second capacitor (C21, C22)
End ground connection.
In the present embodiment, one end of the second capacitor (C21, C22) and the feedback end of fan drive circuit 10 and blower IPM mould
The common end of the fault-signal output end of block 20 connects, the other end ground connection of the second capacitor (C21, C22).Work as fan drive circuit
There are when electromagnetic interference signal in the connection line of 10 feedback end and the fault-signal output end of blower IPM module 20, electromagnetism
Interference signal by the connection line of the feedback end of fan drive circuit 10 and the fault-signal output end of blower IPM module 20,
The low-impedance path that the reference ground of second capacitor (C21, C22) and draught fan control circuit is formed is flowed into reference to ground, and is absorbed.
The setting of second capacitor (C21, C22) can scurry into fan drive circuit 10 to avoid the interference signal in loop, lead to blower
Driving circuit 10 malfunctions.In practical application, first capacitor (C11, C12) and/or the second capacitor (C21, C22) can be close
Fan drive circuit 10 is arranged, to reduce interference of the electromagnetic interference to fan drive circuit 10 in loop.
Referring to Fig. 2 or Fig. 3, in one embodiment, the draught fan control circuit further includes fault detection signal delay circuit
40, the input terminal of the fault detection signal delay circuit 40 is connect with the fault-signal output end of the blower IPM module 20；
The fault detection signal delay circuit 40, for when receiving the fault detection signal that the blower IPM module 20 exports,
It is exported after postponing to the fault detection signal.
In the present embodiment, fault detection signal delay circuit 40 is optional to use third capacitor (C31, C32) Lai Shixian, according to
The characteristic that the voltage at capacitor both ends cannot be mutated can carry out delay process to the fault detection signal of output, while capacitor is also
The noise signal in fault detection circuit can be filtered out, so as to avoid fan drive circuit 10 to the mistake of fault detection signal
Sentence.In some embodiments, fault detection signal delay circuit 40 can also prolonging using the devices such as comparator, timer composition
Slow circuit is realized.
Certainly in other embodiments, fault detection signal delay circuit 40 can also be by being integrated in fan drive circuit
Software algorithm program or hardware circuit in 10 realize the delay filtering to fault detection signal.Specifically, blower drives
Circuit 10 is when receiving fault detection signal, after 10 μ s of delay can be carried out to the signal, controls blower further according to the signal
Shut down or deceleration is handled.
Referring to Fig. 2 or Fig. 3, in one embodiment, the draught fan control circuit further includes pull-up resistor (R1, R2), described
One end of pull-up resistor (R1, R2) is connect with the fault-signal output end of the blower IPM module 20, the pull-up resistor (R1,
R2 the other end) is connect with the first DC power supply VCC.
It is understood that the fault detection signal that blower IPM module 20 exports is generally low level namely blower driving
The level of the feedback end of circuit 10 is pulled up resistance (R1, R2) when not receiving fault detection signal and draws high, and is receiving
When fault detection signal, when realizing level overturning, to improve sensitivity of the fan drive circuit 10 to fault detection signal, together
When can also to avoid by the noise signal of transient state interference and false triggering.
Referring to Fig. 2 or Fig. 3, in one embodiment, the draught fan control circuit further includes current-limiting resistance (R3, R4), described
Current-limiting resistance (R3, R4) is arranged in series fault-signal output end and the fan drive circuit in the blower IPM module 20
Between 10 feedback end.
In the present embodiment, current-limiting resistance (R3, R4) is for avoiding exporting excessive to the electric current of fan drive circuit 10 and damaging
Bad fan drive circuit 10.
Referring to Fig. 4, in one embodiment, the blower IPM module 20 includes:
Inverter bridge 21；
Current foldback circuit 22 for flowing through the electric current of blower in detection, and is detecting that it is default electric that the electric current is greater than
When flow valuve, output overcurrent detects signal；And
The controlled end of inverter bridge driving circuit 23, the control terminal of the inverter bridge driving circuit 23 and the inverter bridge 21 connects
It connects；The inverter bridge driving circuit 23 is used for the driving signal exported according to the fan drive circuit 10, drives the inversion
Bridge 21 works；And when receiving the over-current detection signal, output fault detection signal to the fan drive circuit 10.
In the present embodiment, multiple IGBT, metal-oxide-semiconductor constant power switching tube, Duo Gegong are generally integrated in blower IPM module 20
The quantity of rate switching tube can be four or six, and particular number can be arranged according to motor type, driving power etc..Power
The quantity of switching tube is six, and six power switch tubes form three-phase inversion bridge circuit, and three-phase inversion bridge circuit includes on three-phase
Bridge arm power switch tube and three-phase lower bridge arm power switch tube.Wherein, bridge arm power switch tube and three-phase lower bridge arm function on three-phase
Rate switching tube can be realized using metal-oxide-semiconductor in whole or in part, be also possible to realize using IGBT in whole or in part, also
It can be and realized in whole or in part using HEMT.So set, being conducive to the devices switch according to made of SiC, GaN material
Fireballing feature to reduce the switching loss of IPM module, and then is conducive to save electric energy, reduces module heating.Further
Ground, IGBT and/or MOSFET is optional is realized using power tube made from SiC material.HEMT is optional using made from GaN material
Power tube is realized.
Current foldback circuit 22 can be realized using electronic components such as current sensor, resistance, comparators to blower
Overcurrent protection.Judged by the output electric current of detection blower fan blower whether overcurrent, and in overcurrent, output to inverter bridge is driven
Circuit 23, thus when receiving the over-current detection signal, output fault detection signal to the fan drive circuit 10, with
The overcurrent protection signal driving blower work for exporting fan drive circuit 10 according to blower IPM module 20.Inverter bridge driving electricity
Road can realize using control chip, with the logic gates such as door or door and integrated circuit, for by the driving received letter
After the logical drive signal for number being converted to high/low level, corresponding power switch tube ON/OFF is driven.
In above-described embodiment, in blower IPM module 20, overvoltage crowbar can also be set, to detect DC bus
Voltage realizes the overvoltage protection to compressor, to realize that the circuit of the overvoltage protection to blower, overheat protector can be using electricity
The electronic components such as pressure sensor, resistance, comparator constitute above-mentioned protection circuit, and the shutdown or decelerating operation to blower are protected
Shield.
Referring to Fig. 4, in one embodiment, the draught fan control circuit further includes that temperature overheating protection circuit is (not shown
Out), the temperature overheating protection circuit is connect with the inverter bridge driving circuit 23；
The temperature overheating protects circuit, for detecting 21 temperature of inverter bridge, and is detecting the inverter bridge 21
Temperature exports temperature protection signal when being greater than preset temperature threshold；
The inverter bridge driving circuit 23, is also used to when receiving the temperature protection signal, output fault detection letter
Number to the fan drive circuit 10.
In the present embodiment, temperature overheating protects circuit can be using the electronics such as temperature sensor, thermistor, comparator member
Part realizes the overheating protection to blower IPM.Judge whether blower overheats by 21 temperature of inverter bridge of detection blower fan, and
When overheat, output to inverter bridge driving circuit 23, to export fault detection signal when receiving the overheating detection signal
To the fan drive circuit 10, so that the temperature protection signal that fan drive circuit 1020 is exported according to blower IPM module 20
Drive blower work, such as shutdown or decelerating operation.
The utility model also proposes a kind of air conditioner, including draught fan control circuit as described above.The draught fan control circuit
Detailed construction can refer to above-described embodiment, details are not described herein again；It is understood that due in the utility model air conditioner
Above-mentioned draught fan control circuit is used, therefore, the embodiment of the utility model air conditioner includes that above-mentioned draught fan control circuit is whole
Whole technical solutions of embodiment, and technical effect achieved is also identical, details are not described herein.
The foregoing is merely the alternative embodiments of the utility model, and therefore it does not limit the scope of the patent of the utility model,
Under all utility models in the utility model are conceived, equivalent structure made based on the specification and figures of the utility model
Transformation, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (10)
1. a kind of draught fan control circuit, which is characterized in that the draught fan control circuit includes:
Fan drive circuit is used for output drive signal；
The controlled end of blower IPM module, the blower IPM module is connect with the fan drive circuit, the blower IPM module
Fault-signal output end connect with the feedback end of the fan drive circuit, the output end and blower of the blower IPM module
Connection；The blower IPM module, the driving signal for being exported according to the fan drive circuit drive the blower to work,
And when detecting the fan trouble, output fault detection signal to the fan drive circuit；
Interference signal absorbing circuit, the fault-signal of the input terminal of the interference signal absorbing circuit and the blower IPM module
Output end connection；The interference signal absorbing circuit, for absorb the fault-signal output end of the blower IPM module with it is described
Interference signal in the feedback end connection line of fan drive circuit.
2. draught fan control circuit as described in claim 1, which is characterized in that the quantity of the interference signal absorbing circuit and institute
The quantity for stating blower IPM module is two；
The input terminals of two interference signal absorbing circuits and the fault-signal output end of two blower IPM modules are one by one
It is correspondingly connected with.
3. draught fan control circuit as claimed in claim 2, which is characterized in that the interference signal absorbing circuit includes the first electricity
Hold, the first end of the first capacitor is the input terminal of the interference signal absorbing circuit, the second end of the first capacitor with
The connection of first DC power supply.
4. draught fan control circuit as claimed in claim 2, which is characterized in that the interference signal absorbing circuit includes the second electricity
Hold, the first end of second capacitor is the input terminal of the interference signal absorbing circuit, the second termination of second capacitor
Ground.
5. draught fan control circuit as described in claim 1, which is characterized in that the draught fan control circuit further includes fault detection
The fault-signal of signal delay circuit, the input terminal of the fault detection signal delay circuit and the blower IPM module exports
End connection；The fault detection signal delay circuit, in the fault detection signal for receiving the blower IPM module output
When, it is exported after postponing to the fault detection signal.
6. draught fan control circuit as described in claim 1, which is characterized in that the draught fan control circuit further includes pull-up electricity
Resistance, one end of the pull-up resistor connect with the fault-signal output end of the blower IPM module, the pull-up resistor it is another
End is connect with the first DC power supply.
7. draught fan control circuit as described in claim 1, which is characterized in that the draught fan control circuit further includes current limliting electricity
Resistance, the current-limiting resistance are arranged in series fault-signal output end and the fan drive circuit in the blower IPM module
Between feedback end.
8. draught fan control circuit as claimed in any one of claims 1 to 7, which is characterized in that the blower IPM module packet
It includes:
Inverter bridge；
Current foldback circuit, for flowing through the electric current of blower in detection, and when detecting that the electric current is greater than pre-set current value,
Output overcurrent detects signal；And
The control terminal of inverter bridge driving circuit, the inverter bridge driving circuit is connect with the controlled end of the inverter bridge；It is described inverse
Become the driving signal that bridge driving circuit is used to export according to the fan drive circuit, the inverter bridge is driven to work；And
When receiving the over-current detection signal, output fault detection signal to the fan drive circuit.
9. draught fan control circuit as claimed in claim 8, which is characterized in that the draught fan control circuit further includes temperature overheating
Circuit is protected, the temperature overheating protection circuit is connect with the inverter bridge driving circuit；
The temperature overheating protects circuit, for detecting the inverter bridge temperature, and is detecting that the inverter bridge temperature is greater than
Temperature protection signal is exported when preset temperature threshold；
The inverter bridge driving circuit, is also used to when receiving the temperature protection signal, output fault detection signal to institute
State fan drive circuit.
10. a kind of air conditioner, which is characterized in that including draught fan control circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920172806.7U CN209458171U (en) | 2019-01-30 | 2019-01-30 | Draught fan control circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920172806.7U CN209458171U (en) | 2019-01-30 | 2019-01-30 | Draught fan control circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209458171U true CN209458171U (en) | 2019-10-01 |
Family
ID=68046390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920172806.7U Active CN209458171U (en) | 2019-01-30 | 2019-01-30 | Draught fan control circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209458171U (en) |
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2019
- 2019-01-30 CN CN201920172806.7U patent/CN209458171U/en active Active
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