CN107800350A - Speed-adjusting circuit of alternating and air conditioner - Google Patents
Speed-adjusting circuit of alternating and air conditioner Download PDFInfo
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- CN107800350A CN107800350A CN201711005159.2A CN201711005159A CN107800350A CN 107800350 A CN107800350 A CN 107800350A CN 201711005159 A CN201711005159 A CN 201711005159A CN 107800350 A CN107800350 A CN 107800350A
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- circuit
- alternating
- speed
- pwm signal
- frequency
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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
- 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
- H02P27/06—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 using dc to ac converters or inverters
- H02P27/08—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 using dc to ac converters or inverters with pulse width modulation
- H02P27/085—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 using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
-
- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
Abstract
The invention provides a kind of speed-adjusting circuit of alternating and air conditioner, the first rectification circuit including providing current supply circuit to alternating current generator, on-off circuit and freewheeling circuit, and controlling switch circuit carries out the MCU of on off state switching, on-off circuit is when on off state is turns on, control exchange is electrically accessed and alternating current generator is powered through the first rectification circuit and on-off circuit, in on-off circuit when on off state is to disconnect, caused induced electromotive force is released by freewheeling circuit on the winding of alternating current generator, switched by the MCU on off states for realizing controlling switch circuit according to default frequency rule change output pwm signal in controlling cycle, the operation and speed governing to alternating current generator are realized with this, and high-frequency noise caused by alignment circuit and electromagnetic interference can be effectively reduced, and improve EMC indexs.
Description
Technical field
The present invention relates to AC Motor Control field, more particularly to speed-adjusting circuit of alternating and air conditioner.
Background technology
PWM (pulsewidth modulation) signal that existing speed-adjusting circuit of alternating exports high speed by controller controls electronic cutting
The speed governing of alternating current generator is realized in the speed-sensitive switch switching of pass, because the switching frequency of speed-sensitive switch is high, when carrying out switch switching
The problem of being also easy to produce high-frequency noise and serious electromagnetic interference.
The content of the invention
It is a primary object of the present invention to provide a kind of speed-adjusting circuit of alternating and air conditioner, it is therefore intended that solve existing
The problem of speed-adjusting circuit of alternating high-frequency noise present in control process and serious electromagnetic interference.
To achieve the above object, a kind of speed-adjusting circuit of alternating provided by the invention, the speed-adjusting circuit of alternating
The first rectification circuit, on-off circuit and freewheeling circuit including providing current supply circuit to alternating current generator, and the control switch
Circuit carries out the MCU of on off state switching, wherein,
The on-off circuit on off state for conducting when, control exchange is electrically accessed and through first rectification circuit and opening
Powered-down road powers to alternating current generator, in the on-off circuit when on off state is to disconnect, is produced on the winding of the alternating current generator
Raw induced electromotive force is released by the freewheeling circuit；
The MCU is realized in controlling cycle according to default frequency rule change output pwm signal controls the switch
The on off state switching of circuit.
In a kind of possible design, the MCU is in controlling cycle according to default frequency rule change output PWM letters
Number include：
The frequency of the pwm signal is controlled persistently to raise in controlling cycle.
In a kind of possible design, the MCU is in controlling cycle according to default frequency rule change output PWM letters
Number include：
The frequency of the pwm signal is controlled persistently to raise in previous controlling cycle, in the latter controlling cycle internal control
Making the frequency of the pwm signal persistently reduces.
In a kind of possible design, the MCU is in controlling cycle according to default frequency rule change output PWM letters
Number include：
The frequency of the pwm signal is controlled in controlling cycle persistently to be reduced.
In a kind of possible design, the MCU is in controlling cycle according to default frequency rule change output PWM letters
Number include：
The frequency accidental of the pwm signal is controlled to change in controlling cycle.
In a kind of possible design, the frequency range for controlling the pwm signal is 16-24KHz.
In a kind of possible design, the controlling cycle of the pwm signal is 10-30ms.
In a kind of possible design, the speed-adjusting circuit of alternating also includes the second rectification circuit and load；
Second rectification circuit is used to export direct current after carrying out rectification to the alternating current of input, thinks the load work
Offer power supply is provided；
Caused induced electromotive force passes through the freewheeling circuit, the second rectification circuit and load in the AC Electrical Machine Winding
Unidirectionally released.
In a kind of possible design, the speed-adjusting circuit of alternating also includes pfc circuit；
The pfc circuit is connected between second rectification circuit and the load, thinks second rectification module
The DC voltage of output carries out Active PFC.
In a kind of possible design, the freewheeling circuit includes the first afterflow module and the second afterflow module；
The first afterflow module includes the first diode, and the anode of first diode is the first afterflow module
Input, the negative electrode of first diode is the first afterflow module output end；
The second afterflow module includes the second diode, and the anode of second diode is the second afterflow module
Input, the negative electrode of second diode is the second afterflow module output end.
In a kind of possible design, the second afterflow module also includes the 7th resistance；
7th resistance and second Diode series.
To achieve the above object, the present invention also provides a kind of air conditioner, and the air conditioner includes described alternating current generator and adjusted
Fast circuit.
Speed-adjusting circuit of alternating provided by the invention, including the first rectified current to alternating current generator offer current supply circuit
Road, on-off circuit and freewheeling circuit, and controlling switch circuit carry out the MCU of on off state switching, and on-off circuit is in switch shape
When state is turns on, control exchange is electrically accessed and alternating current generator is powered through the first rectification circuit and on-off circuit, in on-off circuit
When on off state is disconnects, caused induced electromotive force is released by freewheeling circuit on the winding of alternating current generator, is passed through
MCU realizes that the on off state of controlling switch circuit is cut in controlling cycle according to default frequency rule change output pwm signal
Change, operation and speed governing to alternating current generator are realized with this, and high-frequency noise caused by alignment circuit and electricity can be effectively reduced
Magnetic disturbance, and improve EMC indexs.
Brief description of the drawings
Fig. 1 is the circuit modular structure figure of speed-adjusting circuit of alternating first embodiment of the present invention；
Fig. 2 is the pwm signal waveform diagram that MCU is exported in speed-adjusting circuit of alternating first embodiment of the present invention；
Fig. 3 is the circuit modular structure figure of speed-adjusting circuit of alternating 3rd embodiment of the present invention；
Fig. 4 is the circuit modular structure figure with pfc circuit of speed-adjusting circuit of alternating fourth embodiment of the present invention；
Fig. 5 is the particular circuit configurations figure based on Fig. 4；
Fig. 6 is another particular circuit configurations figure based on Fig. 4.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Reference picture 1, Fig. 1 is the speed-adjusting circuit of alternating structural representation that first embodiment of the invention provides, in order to just
In explanation, the part related to the embodiment of the present invention is illustrate only, details are as follows：
The speed-adjusting circuit of alternating of the present embodiment includes the first rectification circuit that current supply circuit is provided to alternating current generator 50
10th, on-off circuit 20 and freewheeling circuit 30, and controlling switch circuit 20 carry out the MCU40 of on off state switching, wherein,
When on off state is turns on, control exchange is electrically accessed and through the first rectification circuit 10 and switch electricity on-off circuit 20
Road 20 powers to alternating current generator 50, in on-off circuit 20 when on off state is to disconnect, caused by the winding of alternating current generator 50
Induced electromotive force is unidirectionally released by freewheeling circuit 30；
MCU40 realizes controlling switch circuit 20 in controlling cycle according to default frequency rule change output pwm signal
On off state switching.
Here the first rectification circuit 10 can be discrete full bridge rectifier or integrated rectifier bridge stack module, first
Rectification circuit 10 includes two ac input ends, and DC output end positive pole and DC output end negative pole.
Here freewheeling circuit 30 can be one and be based on power switch pipe such as IGBT (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor) electronic switching circuit, controlled when MCU40 controlling switches circuit 20 disconnects
The electronic switch of freewheeling circuit closes caused induced electromotive force on the winding for causing alternating current generator 50 and entered by freewheeling circuit 30
Row is released, or by setting a hardware circuit inside freewheeling circuit 30, can be caused when on-off circuit 20 disconnects
Electronic switch inside freewheeling circuit 30 voluntarily turns on, and passes through afterflow to caused induced electromotive force on the winding of alternating current generator 50
Circuit 30 is released, and when on-off circuit 20 closes, disconnected by the electronic switch of its internal circuit freewheeling circuit 30,
It ensure that the normal operation of alternating current generator 50.
Specifically, when MCU40 outputs high-frequency PWM signal control switch circuit 20 is carried out during speed-sensitive switch cuts, when opening
When powered-down road 20 turns on, AC power is that alternating current generator 50 is powered by rectification circuit 10 and on-off circuit 20, works as on-off circuit
During 20 disconnection, because the winding inside alternating current generator 50 is inductive load, electric current can not disconnect moment, therefore produce induction electric
Gesture, this induced electromotive force are released by freewheeling circuit 30, and having thereby protected induced electromotive force will not be on on-off circuit 20
Generation reverse impact causes the switch power tube failure in on-off circuit, ensure that the normal operation of alternating current generator 50 with this, passes through
The dutycycle size of MCU40 output high-frequency PWM signals is controlled, can adjust and be carried in alternating current generator in a PWM power-up period
Voltage time length on 50, it is achieved that speed governing is carried out to it, because the switching speed height of on-off circuit 20 such as can reach
More than 20KHz, by PWM speed governing in the relatively existing power frequency period based on input ac voltage, exchange can be effectively reduced
Vibration and noise in the speed regulation process of motor 50.But because MCU40 output pwm signals frequency is high, therefore in on-off circuit in work
During work, easy parameter high-frequency noise and electromagnetic interference, its EMC can not reach requirement.
The present embodiment to solve the above problems, MCU40 output high frequency pwm control signal when, using in controlling cycle
The frequency of interior control pwm signal exports in the way of default rule changes, rather than as controlled PWM letters in the prior art
Number frequency it is constant.Such as by controlling the frequency of pwm signal to be gradually increased to a default high frequency from a default low frequency
A controlling cycle is completed, next cycle repeats the output of above-mentioned signal.Pwm signal waveform diagram as described in Figure 2,
Its PWM frequency changes as illustrated, the dutycycle of pwm signal is all defeated successively every two pwm signals in 50%, Fig. 2 in figure
Go out the pwm signal that the cycle is gradually reduced from T1-T7, i.e. frequency gradually rises.Test proves that the frequency by controlling PWM
Continually changing state is maintained, high-frequency noise and electromagnetic interference caused by whole alignment circuit can be effectively reduced, its EMC index
Easily reach defined requirement.
It is experimentally confirmed, it is above-mentioned optimal that the excursion value of its PWM frequency for 16-24KHz can make it that control meets
Reduction high-frequency noise and electromagnetic interference requirement, if frequency improves again, the lifting of the switching speed requirements of switch tube, while
Add the operating power consumption of switching tube, it is impossible to meet low cost and reduce horsepower requirements, and underfrequency is that motor tune easily occur
Vibration and noise problem when fast.
Further, the controlling cycle T spans that PWM signal frequency changes in Fig. 2 are 10-30ms, preferable value
The effect of preferably the present embodiment can be realized for 15-25ms, such as in the present embodiment, pwm signal can in 20ms from 16KHz by
Gradually it is increased to 24KHz.
The speed-adjusting circuit of alternating of the embodiment of the present invention, including the first rectification to the offer current supply circuit of alternating current generator 50
Circuit 10, on-off circuit 20 and freewheeling circuit 30, and controlling switch circuit 20 carry out the MCU40 of on off state switching, switch
When on off state is turns on, control exchange is electrically accessed and through the first rectification circuit 10 and on-off circuit 20 to alternating current circuit 20
Machine 50 is powered, and in on-off circuit 20 when on off state is to disconnect, caused induced electromotive force leads on the winding of alternating current generator 50
Freewheeling circuit 30 is crossed to be released, by MCU40 in controlling cycle it is real according to default frequency rule change output pwm signal
The on off state switching of existing controlling switch circuit 20, operation and speed governing to alternating current generator are realized with this, and can effectively dropped
High-frequency noise and electromagnetic interference caused by low alignment circuit, and improve EMC indexs.
Further, based on speed-adjusting circuit of alternating first embodiment of the present invention, speed-adjusting circuit of alternating of the present invention
In second embodiment, MCU40 output frequencies change pwm control signal when, its frequency change rule except first embodiment
Be gradually increased to a default high frequency from a default low frequency and complete a controlling cycle, can also be other changes
Rule：Can complete a controlling cycle, such as pwm signal from a default high frequency by high to one default low frequency is declined
16KHz can be gradually decreased to from 24KHz in 20ms, or can first be gradually increased to one in advance from a default low frequency
If high frequency, then high complete a controlling cycle, such as pwm signal to above-mentioned default low frequency from above-mentioned default high frequency by declining
24KHz can be gradually increased to from 16KHz in 10ms, then gradually decrease to 16KHz from 24KHz in 10ms again, i.e., altogether
20ms completes a controlling cycle.Can be in a control or the frequency of pwm signal is not well-regulated change described above
Randomly generated in cycle processed, its frequency is not in repetition in this controlling cycle, and the change of above-mentioned PWM signal frequency is whether
The regular change again without rule, as long as its frequency is not in a preset time period 20ms described above controlling cycle
Duplicate, can act as high-frequency noise caused by alignment circuit and electromagnetic interference, and improve the effect of EMC performances.
Further, based on speed-adjusting circuit of alternating first embodiment of the present invention, speed-adjusting circuit of alternating of the present invention
In 3rd embodiment, as shown in figure 3, speed-adjusting circuit of alternating also includes the second rectification circuit 60 and load 70, the second rectification
Circuit 60 is used to export direct current after carrying out rectification to the alternating current of input, to provide power supply, alternating current generator for the work of load 70
Caused induced electromotive force is released by freewheeling circuit 30, the second rectification circuit 60 and load 70 on winding.Different from this
The first embodiment of invention, here the caused induced electromotive force on to the winding of alternating current generator 50 of freewheeling circuit 30 release
When, also pass through the second rectification circuit 60 and load 70, because the impedance of load 70 is lower, can play a part of accelerating to release.
Further, freewheeling circuit 30 includes the first afterflow module 31 and the second afterflow module 32；First afterflow module 31
Including the first diode, the anode of the first diode is the input of the first afterflow module 31, and the negative electrode of the first diode is first
The output end of afterflow module 31；
Second freewheeling circuit block 32 includes the second diode, and the anode of the second diode inputs for the second afterflow module 32
End, the negative electrode of the second diode is the output end of the second afterflow module 32.
Here the first afterflow module 31 and the second afterflow module 32 are unidirectional conduction, i.e., freewheeling circuit 30 is to alternating current generator
It when caused induced electromotive force is released on 50 windings, can only unidirectionally be released, i.e., can only pass through the first afterflow module 31
Input released to its output end, or released by the input of the second afterflow module 32 to its output end.
Here the second rectification circuit 10 can be discrete full bridge rectifier or rectification integrated as illustrated in the drawing
Bridge heap module.
Here when AC power is powered from N lines and from L lines to alternating current generator 50 respectively, in on-off circuit 20
During disconnection, caused induced electromotive force passes through the either afterflow of one of afterflow module 31 respectively on its winding of alternating current generator 50
Module 32 is released through the second rectification circuit 60 and load 70 again.As, when AC power is from N lines, it is exchanged in Fig. 3
Caused induced electromotive force is let out through loading the 70, second rectification circuit 60 again by the first afterflow module 31 on the winding of motor 50
Put, and when AC power is from L lines, caused induced electromotive force passes through the second rectification circuit on its winding of alternating current generator 50
60th, the afterflow module 32 of load 70 and second is released.
Further, based on speed-adjusting circuit of alternating 3rd embodiment of the present invention, speed-adjusting circuit of alternating of the present invention
In fourth embodiment, as shown in figure 4, speed-adjusting circuit of alternating also includes pfc circuit 80, it is whole that pfc circuit 80 is connected on second
Between current circuit and load, think that the DC voltage of the second rectification module output carries out Active PFC, through the work(of pfc circuit 80
Direct current supply load 70 after rate factor correction works, load 70 here for the load such as DC operation of direct current supply electricity
Machine or the physical circuit of other direct current supplys, be not simple load, as switching power circuit, motor-drive circuit,
Compressor drive circuit etc..Pfc circuit 80 may also participate in continuous current circuit, rise in addition to above-mentioned Active PFC effect
To the effect that continuous current circuit is formed with the first afterflow module 31 and the second afterflow module 32 and the second rectification circuit 60.
Physical circuit figure based on Fig. 4 as shown in figure 5, pfc circuit 80 mainly by PFC inductance L2, IGBT switching tubes Q1, two
The active PFC circuit of pole pipe D1 compositions, MCU 40 pass through pin P2 output pwm signals to IGBT drive circuit driving switch pipe Q1
Work, while MCU is electric by the voltage detecting current detecting PFC being made up of resistance R1 and resistance R2 and resistance R7 and resistance R8
The input voltage and output voltage on road 80, suitable pwm signal control pfc circuit 80 is exported with this and worked.
Physical circuit shown in Fig. 5 also includes filter circuit, and filter circuit is made up of electrochemical capacitor E1, to rectifier bridge stack
DC bus-bar voltage after DR1 rectifications carries out smothing filtering, to increase filter effect, can also be further added by an electrochemical capacitor
E2。
Load 70 is herein for mainly by IPM (Intelligent Power Module) and compressor set into composition is compressed
Drive circuit, compressor can also be direct current generator here certainly, and direct current motor drive circuit is formed with this.
First rectification circuit 10 is made up of four diode FD1-FD4, including two inputs and output head anode and defeated
Go out and hold negative pole, wherein diode FD1 anode and diode FD2 cathode connections is an input, diode FD4 anode and
Diode FD3 cathode connections are another input, and diode FD1 negative electrode and diode FD4 the moon tie point export for positive pole
End, diode FD2 anode and diode FD3 anodes tie point are cathode output end, and alternating current generator 50 is series at exchange input
Holding ACL-IN and ACN-IN, wherein electric capacity FC1 is alternating current into the ac circuit of two inputs of the second rectification module 30
The start-up capacitance of machine 50, is connected in parallel on the startup winding both ends of alternating current generator 50, and alternating current generator is series at ACN-IN and handed in this figure
N line ends are flowed, ACL-IN can also be connected on and exchange L line ends.On-off circuit 20 is mainly made up of the first IGBT switching tubes Q2, the
One switching tube Q2 forms first switch unit 41, realizes the switch switching of on-off circuit 20, and on-off circuit 20 also includes IGBT and driven
Dynamic circuit, MCU40 drive first switch pipe Q2 switch motion by pin P1 output pwm signals to IGBT drive circuit.
When IGBT is turned on, the electric current of AC power output is through alternating current generator 50, the first rectification circuit 10 and first switch
Pipe Q2 forms current loop, and power supply is provided for the work of alternating current generator 50.Its current loop is specific as follows：When the electric current of AC power
L lines, anode and negative electrode through diode FD1, first switch pipe Q2 collector and emitter, two are exchanged from ACL-IN
The ACN-IN that pole pipe FD3 anode returns to AC power with negative electrode, alternating current generator 50 exchanges N lines；When the electric current of AC power
N lines, the colelctor electrode through alternating current generator 50, diode FD4 anode and negative electrode, first switch pipe Q2 are exchanged from ACN-IN
L lines are exchanged with emitter stage, diode FD2 anode and negative electrode, the ACL-IN that returns to AC power.Here on-off circuit 20
First switch pipe Q2 can also be MOS (metal-oxide semiconductor (MOS)) power tube, and now IGBT drivings are corresponding to be changed to MOS driving electricity
Road.
First afterflow module 31 and the second afterflow module 32 are made up of the first diode FD5 and the second diode FD6 respectively,
Play unidirectional conduction function, the anode FD5 of the first diode is the input of the first afterflow module 31, the first diode FD5 the moon
The extremely output end of the first afterflow module 31, the anode FD6 of the second diode are the input of the second afterflow module 32, the second diode
FD6 negative electrode is the output end of the second afterflow module 32, and the first diode FD5 and the second diode FD6 are respectively in on-off circuit 20
During closing, continuous current circuit is provided to the induced electromotive force of opposed polarity caused by the winding coil in alternating current generator 50.Specifically such as
Under：When the sense of current of AC power is to produce induced electromotive force in the winding coil of alternating current generator 50 from L lines, it is continuous
Flow back to road and enter direct current from i.e. the 4th pin of the rectified bridge heap DR1 cathode output ends of L lines, dc bus positive pole, PFC inductance L2
Load 70, dc bus negative pole enter the first diode FD5 anode and negative electrode, diode FD3 anode and negative electrode, alternating current
Machine 50 returns to the N lines of AC power；When the sense of current of AC power is the winding coil production from N lines in alternating current generator 50
During raw induced electromotive force, its continuous current circuit is from N lines through alternating current generator 50, diode FD4 anode and negative electrode, the two or two pole
Pipe FD6 anode and negative electrode, dc bus positive pole enters DC load 70, dc bus negative pole enters rectifier bridge stack DR1 negative poles
Output end is the 1st pin, eventually passes back to the L lines of AC power, the sense of current and on-off circuit of alternating current generator 50 in continuous current circuit
Sense of current during 20 conducting is identical, and its induced electromotive force carries out afterflow by rectifier bridge stack DR1 in loop by DC load 70
Release, ensure that the reliability service of motor.From the above, it can be seen that because the first afterflow module 31 and the second afterflow module 32 connect
The output end of the first rectification circuit 10 is connected on, its continuous current circuit is except by the first rectification circuit 10 and load 70, it is also necessary to the
Two rectification circuits 60 participate in.
Further, on-off circuit 20 can also include the first RC absorbing circuits, and the first RC absorbing circuits include the second electricity
Hold FC3 and second resistance FR4, the second electric capacity FC3 one end connection second resistance FR4 one end, the second electric capacity FC3 other end
Connect first switch pipe Q2 colelctor electrode, second resistance FR4 other end connection first switch pipe Q2 emitter stage.When switch electricity
The switching tube on road 20 produces the high voltage of induced electromotive force formation in cut-off in the winding coil of alternating current generator 50, and first absorbs
Unit can form auxiliary afterflow to induced electromotive force by the second rectification module 30 and release, and play suppression action of high voltage, simultaneously
It can be delivered on on-off circuit 20 by the second rectification module 30 because the winding coil of alternating current generator 50 produces induced electromotive force
High voltage is formed, therefore the first absorptive unit also suppresses to high voltage on on-off circuit 20 simultaneously, and switch electricity can be absorbed
The high frequency electromagnetic noise formed during the switch switching of road 20, improves EMC performances.
Further, the speed-adjusting circuit of alternating that embodiment provides can also include the 2nd RC absorbing circuits, the 2nd RC
Absorbing circuit includes the 3rd electric capacity FC2 and 3rd resistor FR1, and the 3rd electric capacity FC2 one end connects 3rd resistor FR1 one end,
One end of the 3rd electric capacity FC2 main winding of other end connection alternating current unit 50,3rd resistor FR1 other end connection alternating current
The other end of unit main winding 50.It is identical with the effect of the first RC absorbing circuits, when the switching tube of on-off circuit 20 is in cut-off
When the winding coil of alternating current generator 50 produces the high voltage that induced electromotive force is formed, the 2nd RC absorbing circuits are to induced electromotive force
Form afterflow to release, play suppression action of high voltage, while the 2nd RC absorbing circuits can be to switch by the first rectification circuit 10
High voltage on the switching tube of circuit 20 is suppressed, and can be absorbed the high-frequency electromagnetic formed during the switch switching of on-off circuit 20 and be made an uproar
Sound, improve EMC performances.
Further, as shown in fig. 6, the second afterflow module 32 also includes the 7th resistance R9, the 7th resistance R9 and second is continuous
The second diode FD6 series connection of flow module 32, the second diode FD6 connect with the 7th resistance R9, the second diode FD6 in Fig. 6
Negative electrode connect the 7th resistance R7 one end, output end of the 7th resistance RR9 other ends as the second afterflow module 32；Except such as
In Fig. 6 outside the second diode FD6 and the 7th resistance R9 series systems, the 7th resistance R9 can also be connected to the second diode FD6
Anode-side, the input of such 7th resistance R9 one end as the second afterflow module 32.
Due to filter circuit also be present in the speed-adjusting circuit of alternating shown in Fig. 6, electrochemical capacitor E1 as illustrated in the drawing
And E2, it is that compressor drive circuit and compressor are born that the load 70 in air-conditioner field is such as applied because the power of load 70 is higher
Carry, therefore it could be to load 70 to provide stable voltage that electrochemical capacitor E1 and E2 capacity are very big, as being electrolysed in actual application
Electric capacity E1 and E2 are generally more than 200uF, and so when circuit is when upper electric, electrochemical capacitor E1 and E2 can be charged, and fills
Electric current is very high, has two for the charge circuit that Fig. 6 is actually constituted, one is ac input end is through PFC inductance L2, second whole
Current circuit 60 is charged to electrochemical capacitor E1 and E2；The second is ac input end is through the first rectification circuit 10 and first or second
Afterflow module is charged to electrochemical capacitor E1 and E2, and because first loop needs the PFC inductance through excessive impedance, it charges
Impedance loop is significantly larger than the first or second impedance through afterflow module, therefore the actual electric current in upper electricity charging substantially passes through the
Two charge circuits, so that the second charge circuit electric current in charging is very high, and this requires the component in charge circuit
Such as the second rectification module and the component of the first and second afterflow modules need that corresponding high electric current can be born, therefore in first device
The device from resistance to high current value is needed during part type selecting, can so greatly increase the cost of whole circuit.To solve this problem,
Connected in afterflow module a resistance, increase is gone here and there with the second diode FD6 in the second afterflow module 32 in circuit as shown in Figure 6
7th resistance R9 of connection, plays metering function, ensure that when upper electricity charges to electrochemical capacitor E1 and E2, increase above-mentioned
First charge circuit impedance of second charge circuit impedance and serious offense, charging current is basically by first so in charging
Individual charging is returned, and greatly reduces the electric current in second charge circuit, therefore reduce the device in second charge circuit
Electric current bears specification requirement, it is only necessary to common relatively small capacity electric current is selected, because first loop is in normal work
As when need to power to high power load 70, its device can bear big current value in itself, therefore circuit device is without changing.It is logical
Crossing the above-mentioned mode for increasing an inexpensive resistance in afterflow module reduces the practical application cost of whole circuit.
In the description of this specification, the description meaning of reference term " first embodiment ", " second embodiment ", " example " etc.
Refer to reference to specific method, device or the feature that the embodiment or example describe be contained in the present invention at least one embodiment or
In example.In this manual, identical embodiment or example are necessarily directed to the schematic representation of above-mentioned term.And
And specific features, method, apparatus or the feature of description can be in any one or more embodiments or example with suitable side
Formula combines.In addition, in the case of not conflicting, those skilled in the art can be real by the difference described in this specification
Apply example or example and the feature of different embodiments or example is combined and combined.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (12)
1. a kind of speed-adjusting circuit of alternating, its spy is being, the speed-adjusting circuit of alternating includes providing to alternating current generator
The first rectification circuit, on-off circuit and the freewheeling circuit of current supply circuit, and the control on-off circuit carry out on off state and cut
The MCU changed, wherein,
When on off state is turns on, control exchange is electrically accessed and through first rectification circuit and switch electricity the on-off circuit
Road powers to alternating current generator, in the on-off circuit when on off state is to disconnect, caused by the winding of the alternating current generator
Induced electromotive force is released by the freewheeling circuit；
The MCU is realized in controlling cycle according to default frequency rule change output pwm signal controls the on-off circuit
On off state switching.
2. speed-adjusting circuit of alternating as claimed in claim 1, it is characterised in that the MCU is in controlling cycle according to pre-
If frequency rule change output pwm signal include：
The frequency of the pwm signal is controlled persistently to raise in controlling cycle.
3. speed-adjusting circuit of alternating as claimed in claim 2, it is characterised in that the MCU is in controlling cycle according to pre-
If frequency rule change output pwm signal include：
Control the frequency of the pwm signal persistently to raise in previous controlling cycle, institute is controlled in the latter controlling cycle
Stating the frequency of pwm signal persistently reduces.
4. speed-adjusting circuit of alternating as claimed in claim 1, it is characterised in that the MCU is in controlling cycle according to pre-
If frequency rule change output pwm signal include：
The frequency of the pwm signal is controlled in controlling cycle persistently to be reduced.
5. speed-adjusting circuit of alternating as claimed in claim 1, it is characterised in that the MCU is in controlling cycle according to pre-
If frequency rule change output pwm signal include：
The frequency accidental of the pwm signal is controlled to change in controlling cycle.
6. speed-adjusting circuit of alternating as claimed in claim 1, it is characterised in that
The frequency range for controlling the pwm signal is 16-24KHz.
7. speed-adjusting circuit of alternating as claimed in claim 6, it is characterised in that
The controlling cycle of the pwm signal is 10-30ms.
8. speed-adjusting circuit of alternating as claimed in claim 1, it is characterised in that the speed-adjusting circuit of alternating also includes
Second rectification circuit and load；
Second rectification circuit is used to export direct current after carrying out rectification to the alternating current of input, thinks that the loaded work piece carries
Power supply source；
Caused induced electromotive force is carried out by the freewheeling circuit, the second rectification circuit and load in the AC Electrical Machine Winding
Unidirectionally release.
9. speed-adjusting circuit of alternating as claimed in claim 8, it is characterised in that the speed-adjusting circuit of alternating also includes
Pfc circuit；
The pfc circuit is connected between second rectification circuit and the load, thinks the second rectification module output
DC voltage carry out Active PFC.
10. speed-adjusting circuit of alternating as claimed in claim 9, it is characterised in that the freewheeling circuit includes the first afterflow
Module and the second afterflow module；
The first afterflow module includes the first diode, and the anode of first diode inputs for the first afterflow module
End, the negative electrode of first diode is the first afterflow module output end；
The second afterflow module includes the second diode, and the anode of second diode inputs for the second afterflow module
End, the negative electrode of second diode is the second afterflow module output end.
11. speed-adjusting circuit of alternating as claimed in claim 10, it is characterised in that the second afterflow module also includes the
Seven resistance；
7th resistance and second Diode series.
12. a kind of air conditioner, it is characterised in that the air conditioner includes the alternating current generator as described in claim 1 to 11 is any
Alignment circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005159.2A CN107800350A (en) | 2017-10-23 | 2017-10-23 | Speed-adjusting circuit of alternating and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005159.2A CN107800350A (en) | 2017-10-23 | 2017-10-23 | Speed-adjusting circuit of alternating and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107800350A true CN107800350A (en) | 2018-03-13 |
Family
ID=61533561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711005159.2A Pending CN107800350A (en) | 2017-10-23 | 2017-10-23 | Speed-adjusting circuit of alternating and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107800350A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082736A (en) * | 2020-01-21 | 2020-04-28 | 佛山市银丰世科科技有限公司 | Drive circuit for alternating current motor and household appliance |
| CN111355436A (en) * | 2020-03-09 | 2020-06-30 | 珠海格力电器股份有限公司 | Driver carrier frequency control method and device capable of effectively reducing interference and driver |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101064483A (en) * | 2006-04-26 | 2007-10-31 | 日产自动车株式会社 | Device and method for controlling power converting device |
| CN101946398A (en) * | 2008-02-20 | 2011-01-12 | 矢崎总业株式会社 | Motor load control device |
| CN107154769A (en) * | 2017-03-23 | 2017-09-12 | 广东美的制冷设备有限公司 | Speed-adjusting circuit of alternating and air conditioner |
-
2017
- 2017-10-23 CN CN201711005159.2A patent/CN107800350A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101064483A (en) * | 2006-04-26 | 2007-10-31 | 日产自动车株式会社 | Device and method for controlling power converting device |
| CN101946398A (en) * | 2008-02-20 | 2011-01-12 | 矢崎总业株式会社 | Motor load control device |
| CN107154769A (en) * | 2017-03-23 | 2017-09-12 | 广东美的制冷设备有限公司 | Speed-adjusting circuit of alternating and air conditioner |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082736A (en) * | 2020-01-21 | 2020-04-28 | 佛山市银丰世科科技有限公司 | Drive circuit for alternating current motor and household appliance |
| CN111082736B (en) * | 2020-01-21 | 2021-07-13 | 佛山市银丰世科科技有限公司 | Drive circuit for alternating current motor and household appliance |
| CN111355436A (en) * | 2020-03-09 | 2020-06-30 | 珠海格力电器股份有限公司 | Driver carrier frequency control method and device capable of effectively reducing interference and driver |
| CN111355436B (en) * | 2020-03-09 | 2021-11-23 | 珠海格力电器股份有限公司 | Driver carrier frequency control method and device capable of effectively reducing interference and driver |
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Application publication date: 20180313 |