CN106849831B - Speed-adjusting circuit of alternating and air conditioner - Google Patents
Speed-adjusting circuit of alternating and air conditioner Download PDFInfo
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- CN106849831B CN106849831B CN201710182522.1A CN201710182522A CN106849831B CN 106849831 B CN106849831 B CN 106849831B CN 201710182522 A CN201710182522 A CN 201710182522A CN 106849831 B CN106849831 B CN 106849831B
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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Abstract
The present invention provides a kind of speed-adjusting circuit of alternating and air conditioners, including ac input end, first rectification module, load, second rectification module, switch module, first afterflow module, second afterflow module and MCU, continuous current circuit is provided by the first afterflow module or the second afterflow module for induced electromotive force on AC Electrical Machine Winding coil, and its continuous current circuit passes through existing rectification module and load in circuit, it does not need additionally to increase electronic switch afterflow, its the first afterflow module and the second afterflow module are made of the device for having unidirectional conduction function, therefore cost can be greatly reduced, and the control of MCU is not needed in afterflow, it is realized by simple hardware circuit completely, therefore the high reliablity of work, avoiding control in the prior art leads to device failure problem, improve the EMC performance of electric current.
Description
Technical field
The present invention relates to AC Motor Control field more particularly to speed-adjusting circuit of alternating and air conditioner.
Background technique
A kind of current speed-adjusting circuit of alternating as shown in Figure 1, AC power source L or N line series AC motor, input
To rectification module, series-connection electronic switch K1 in two output end loops of rectification module, while motor both ends another electronics in parallel
Switch K2, MCU export the on and off of PWM (pulsewidth modulation) signal control electronic switch K1, when K1 conducting, AC power source
Current path is formed to provide operating current for alternating current generator by alternating current generator, rectification module, K1, and when K1 is closed, MCU is controlled
K2 conducting processed, the induced electromotive force generated in AC Electrical Machine Winding when closing to K1 carry out afterflow and release, and MCU is controlled by this
Mode realizes the speed regulation of alternating current generator, this circuit has the following deficiencies:
First: needing individual electronic switch K2 to realize the electric energy afterflow of alternating current generator, since electronic switch K2 is by big function
The switching tube of rate is constituted, therefore needing to increase cost leads to high expensive.
First: dead time when needing to consider that K1 and K2 is switched in control, i.e. K1 is opened pass to K2 and K2 is closed to K1
The time opened is easy to generate high voltage and larger at machine winding coil both ends and the both ends electronic switch K1 in dead time
High frequency electromagnetic noise, the switching tube of rapid wear power consumption sub switch K1 and K2, while reducing the EMC performance of circuit.
Summary of the invention
The main purpose of the present invention is to provide a kind of speed-adjusting circuit of alternating and air conditioners, it is therefore intended that solves existing
Speed-adjusting circuit of alternating there are problems that high expensive and control is abnormal that circuit devcie is caused to damage.
To achieve the above object, a kind of speed-adjusting circuit of alternating provided by the invention, the speed-adjusting circuit of alternating
Including ac input end, the first rectification module, load, the second rectification module, switch module, the first afterflow module, the second afterflow
Module and MCU；
First rectification module exports after rectifying to the alternating current for the AC power source that the ac input end inputs
Two output ends of direct current, first rectification module connect DC bus, to provide power supply for loaded work piece；
Second rectification module exports after rectifying to the alternating current for the AC power source that the ac input end inputs
Direct current, two output end connection switch modules of second rectification module provide power supply for switch module work；
The switch module realizes that switch state switches under the control of the MCU, by the AC power source, described second
Rectification module and the switch module form the power supply circuit of the alternating current generator, and in switch module conducting, described
Power supply circuit of the alternating current of AC power source through the alternating current generator is alternating current generator power supply；
The first afterflow module and the second afterflow module include input and output side, the first afterflow module and second
Afterflow module is unidirectional conduction, and electric current is inputted from the input terminal of the first afterflow module or the second afterflow module, from described the
The output of the output end of one afterflow module or the second afterflow module；In switch module cut-off, the winding of the alternating current generator
The induced electromotive force generated on coil carries out afterflow by the first afterflow branch or the second afterflow branch and releases, first afterflow
Branch includes the first afterflow module, first rectification module and the load, and the second afterflow branch includes described second
Afterflow module, first rectification module and the load；The input terminal of the first afterflow module and the second afterflow mould
The output end of block connects the power supply circuit of the alternating current generator, the output end of the first afterflow module and the second afterflow mould
The input terminal of block connects the DC bus, the input terminal of the output end of the second afterflow module, the first afterflow module
It is connected to an input terminal of second rectification module, the input terminal connection of the second afterflow module altogether with one end of the motor
The output end of the first rectification module negative pole of output end, the first afterflow module connects the first rectification module output end
Anode.
Preferably, the speed-adjusting circuit of alternating further includes the first PFC module；
First PFC module is connected between the ac input end and first rectification module, for described
The DC voltage of one rectification module output carries out Active PFC.
Preferably, the speed-adjusting circuit of alternating further includes the second PFC module；
Second PFC module by the DC bus be connected on first rectification module and load between, with for
The DC voltage of the first rectification module output carries out Active PFC.
Preferably, the input terminal of the first afterflow module connects the input terminal of second rectification module, and described first
The output end of afterflow module connects the output head anode of first rectification module；
The input terminal of the second afterflow module connects the negative pole of output end of first rectification module, second afterflow
The output end of module connects the input terminal of second rectification module.
Preferably, the input terminal of the first afterflow module connects the second rectification module input terminal, and described first is continuous
The output end of flow module connects the output head anode of second PFC module；
The input terminal of the second afterflow module connects the negative pole of output end of second PFC module, second afterflow
The output end of module connects the input terminal of second rectification module.
Preferably, the speed-adjusting circuit of alternating further includes filter module；
The filter module is connected between first rectification module and load by the DC bus, to be described
The DC voltage of first rectification module output carries out smothing filtering.
Preferably, the first afterflow module includes first diode, and the second afterflow module includes the second diode；
The anode of the first diode is the first afterflow module input, and the cathode of the first diode is institute
State the first afterflow module output end；
The anode of second diode is the second afterflow module input, and the cathode of second diode is institute
State the second afterflow module output end.
Preferably, the speed-adjusting circuit of alternating further includes first capacitor；
The both ends of the first capacitor are separately connected the first afterflow module output end and the second afterflow module is defeated
Enter end.
Preferably, the switch module includes first switch unit and the first RC absorptive unit；
The first switch unit realizes the switching of switch module；
The first RC absorptive unit is parallel to first switch unit both ends, for absorbing the first switch unit
The high voltage generated when switching at first switch unit both ends and the main winding both ends of the alternating current generator.
Preferably, the first RC absorptive unit includes the second capacitor and second resistance；
One end of one end connection second resistance of second capacitor, the other end connection described first of second capacitor
One end of switch unit, the other end of the second resistance connect the other end of the first switch unit.
Preferably, the speed-adjusting circuit of alternating further includes the 2nd RC absorption module；
The 2nd RC absorption module is parallel to the alternating current unit main winding both ends, for absorbing the switch module
The high voltage generated when switching at the main winding both ends of the alternating current generator and the switch module both ends.
To achieve the above object, the present invention also provides a kind of air conditioner, the air conditioner includes the alternating current generator tune
Fast circuit.
Speed-adjusting circuit of alternating provided in an embodiment of the present invention is by the first afterflow module 50 or the second afterflow module
Store electric energy on AC Electrical Machine Winding coil and continuous current circuit be provided, and its continuous current circuit by existing rectification module in circuit and
Load, does not need additionally to increase electronic switch afterflow, and the first afterflow module and the second afterflow module are by having unidirectional conduction function
The device of energy is constituted, therefore cost can be greatly reduced, and the control of MCU is not needed in afterflow, completely by simple hardware
The high reliablity that circuit is realized, therefore worked, avoiding control in the prior art leads to device failure problem, improves electric current
EMC performance.
Detailed description of the invention
Fig. 1 is the speed-adjusting circuit of alternating function structure chart of the prior art；
Fig. 2 is the function structure chart of speed-adjusting circuit of alternating first embodiment of the present invention；
Fig. 3 is the continuous current circuit schematic diagram of speed-adjusting circuit of alternating first embodiment of the present invention；
Fig. 4 is another continuous current circuit schematic diagram of speed-adjusting circuit of alternating first embodiment of the present invention；
Fig. 5 is the circuit structure diagram of speed-adjusting circuit of alternating second embodiment of the present invention；
Fig. 6 is the function structure chart of speed-adjusting circuit of alternating 3rd embodiment of the present invention；
Fig. 7 is the circuit structure diagram of speed-adjusting circuit of alternating 3rd embodiment of the present invention；
Fig. 8 is another function structure chart of speed-adjusting circuit of alternating 3rd embodiment of the present invention；
Fig. 9 is another circuit structure diagram of speed-adjusting circuit of alternating 3rd embodiment of the present invention；
Figure 10 is the function structure chart of speed-adjusting circuit of alternating fourth embodiment of the present invention
Figure 11 is the circuit structure diagram of speed-adjusting circuit of alternating fourth embodiment of the present invention；
Figure 12 is the function structure chart of the 5th embodiment of speed-adjusting circuit of alternating of the present invention；
Figure 13 is the circuit structure diagram of the 5th embodiment of speed-adjusting circuit of alternating of the present invention；
Figure 14 is the function structure chart of speed-adjusting circuit of alternating sixth embodiment of the present invention；
Figure 15 is the circuit structure diagram of speed-adjusting circuit of alternating sixth embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Referring to Fig. 2, Fig. 2 is the speed-adjusting circuit of alternating function structure chart that first embodiment of the invention provides, in order to just
In explanation, only parts related to embodiments of the present invention are shown, and details are as follows:
Speed-adjusting circuit of alternating provided in an embodiment of the present invention includes ac input end, the first rectification module 10, load
20, the second rectification module 30, switch module 40, the first afterflow module 50, the second afterflow module 60 and MCU70.
First rectification module 10 exports direct current after rectifying to the alternating current for the AC power source that ac input end inputs,
Two output ends of the first rectification module 10 connect DC bus, provide power supply to work for load 20, here the first rectification module
10 can be discrete full bridge rectifier or integrated rectifier bridge stack module, and the first rectification module 10 includes that two exchanges are defeated
Enter end and DC output end anode and DC output end cathode.
Second rectification module 30 exports direct current after rectifying to the alternating current for the AC power source that ac input end inputs,
Two output end connection switch modules of the second rectification module 30 provide power supply, the second rectification module 30 packet for switch module work
Two ac input ends and DC output end anode and DC output end cathode are included, the second rectification module 30 can be here
Discrete full bridge rectifier or integrated rectifier bridge stack module.
Switch module 40 realizes that switch state switches under the control of MCU70, and AC power source, is opened the second rectification module 30
The power supply circuit that module 40 forms alternating current generator is closed, and when switch module 40 is connected, the alternating current of AC power source is through above-mentioned
The power supply circuit of alternating current generator is the power supply of alternating current generator 80；
First afterflow module 50 and the second afterflow module 60 include input and output side, and the first afterflow module 50 and second is continuous
Flow module 60 is unidirectional conduction, and electric current is inputted from the input terminal of the first afterflow module 50 or the second afterflow module 60, continuous from first
Flow module 50 or the output of the output end of the second afterflow module 60；The input terminal of first afterflow module 50 and the second afterflow module 60
Output end connects the power supply circuit of above-mentioned alternating current generator, the input of the output end of the first afterflow module 50 and the second afterflow module 60
End connection DC bus, the output end of specific second afterflow module 60, the input terminal of the first afterflow module 50 and motor 80
One end is connected to an input terminal of the second rectification module 30 altogether, and it is defeated that the input terminal of the second afterflow module 60 connects the first rectification module 10
The output end of outlet cathode, the first afterflow module 50 connects 10 output head anode of the first rectification module；
When switch module 40 ends, the induced electromotive force generated on the winding coil of alternating current generator 80 passes through continuous current circuit
It carries out afterflow to release, the circuit for constituting continuous current circuit includes the first afterflow module 50 or the second afterflow module 60, first rectification mould
Block 10 and load 20.It should be noted that due to from ac input end L line and being handed over by the alternating current of alternating current generator 80
Stream input terminal N line sets out two kinds of directions, therefore the induced electricity generated on 80 winding coil of alternating current generator in switch module cut-off
Kinetic potential polarity by its coil by alternating current direction difference it is different, because different induced electromotive force polarity is corresponding
Continuous current circuit is different, as shown in figure 3, current direction is alternating current generator when alternating current direction is from input terminal L line
80 B terminals flow to A terminals, at this time when switch module 40 ends, the sense that generates on 80 winding coil of alternating current generator
Answering electromotive force direction is that the end B is negative, and the end A is positive, it carries out the loop current direction tool that afterflow is released to induced electromotive force at this time
Body as shown in dotted portion in Fig. 3, wherein arrow direction be current direction, circuit specifically: from alternating current L line by
First rectification module 10 simultaneously exports, DC bus anode, load 20, DC bus from the output head anode of the first rectification module 10
Cathode, the second afterflow module 60, motor 80 eventually pass back to alternating current N line, i.e. induced electromotive force is let out by the progress afterflow of this circuit
It puts, it is identical by 80 current direction of motor before being ended by 80 current direction of motor with switch module 40 in this continuous current circuit,
Therefore the electric current in this circuit plays the role of afterflow to induced electromotive force and releases.And when alternating current direction is from input terminal N line
When, current direction is that the A terminals of alternating current generator 80 flow to B terminals, as shown in figure 4, at this time when switch module 40 ends
When, the induced electromotive force direction generated on 80 winding coil of alternating current generator is that the end A is negative, and the end B is positive, it is to induced electricity at this time
The loop current that kinetic potential progress afterflow is released is specific as shown in dotted portion in Fig. 4, and wherein arrow direction is current direction, time
Road specifically: female by motor 80, the first afterflow module 50, DC bus anode, load 20, direct current from alternating current N line
The input terminal output of the cathode input L line of the output of line cathode, the first rectification module 10 returns to alternating current L line, returns in this afterflow
It is also identical by 80 current direction of motor before being ended by 80 current direction of motor with switch module 40 in road, therefore in this circuit
Electric current play the role of afterflow to induced electromotive force and release.Since the first afterflow module and the second afterflow module are that unidirectional conduction is made
With, could the induced electromotive force respectively to above-mentioned opposed polarity formed different continuous current circuits to induced electromotive force carry out afterflow let out
It puts, ensure that the normal work of motor；Meanwhile unidirectional conduction also acts as buffer action, guarantees in the conducting pair of switch module 40
When motor 80 is powered, the high direct voltage exported from the first rectification module 10, which will not be sealed in, makes switching molding into switch module
Block can not work normally, that is, play the role of the DC voltage that the output of the first rectification module 10 is isolated.
In above-mentioned speed-adjusting circuit of alternating, the first rectification module 10 and load 20 also constitute the one of existing control circuit
Part, such as air conditioner, in the control circuit of air conditioner, load 20 may include that compressor drive circuit and compressor are negative
The circuit constituted is carried, the first rectification module 10 output DC voltage is that load 20 provides working power by DC bus.This hair
The speed-adjusting circuit of alternating that bright embodiment provides exports the switching signal of high speed by MCU70 (such as frequency is in 10-30KHz)
It is that motor 80 is powered that the progress switch state switching of control switch module 40, which is AC power source when switch module 40 is connected, is being opened
When closing module 40 and ending, by including the continuous current circuit that is made of the first afterflow module 50 or the second afterflow module 60 to alternating current
The induced electromotive force generated on the winding coil of machine 80 carries out afterflow and releases, and MCU 70 is by changing in switching signal a cycle
The length of time of door opening module 40 is connected, realizes speed regulation to motor 80, and when door opening module 40 is closed in one cycle, by
It is high in the frequency of switching signal, induced electromotive force can be generated on alternating current generator 80, it is therefore desirable to a switching signal period
This induced electromotive force is released before terminating, just can guarantee the normal work of motor 80.
Speed-adjusting circuit of alternating provided in an embodiment of the present invention passes through the first afterflow module 50 and the second afterflow module 60
Induced electromotive force to generate on 80 winding coil of alternating current generator provides continuous current circuit, and its continuous current circuit is by the first afterflow module
50 or second afterflow module 60 participate in and by the 20 pairs of above-mentioned inductions of the first rectification module 20 existing in control circuit and load
Electromotive force carries out afterflow and releases, and does not need additionally to increase electronic switch afterflow, the first afterflow module 50 and the second afterflow module
60 are made of the device for having unidirectional conduction function, therefore cost can be greatly reduced, and the control of MCU is not needed in afterflow,
Its high reliablity realized, therefore worked by simple hardware circuit completely, avoiding control in the prior art causes device to damage
Bad problem improves the EMC performance of electric current.
Referring to Fig. 5, Fig. 5 is the circuit structure diagram of speed-adjusting circuit of alternating second embodiment of the present invention, for the ease of saying
Bright, only parts related to embodiments of the present invention are shown, specific as follows:
First rectification module 10 is made of rectifier bridge stack DR1, to ac input end input AC power source alternating current into
Direct current is exported after row rectification；
Load 20 is DC load, the motor of such as DC operation of the load including common direct current supply, DC load
It can be the physical circuit of direct current supply, be not simple load, such as switching power circuit, motor-drive circuit.
Second rectification module 30 is made of four diode FD1-FD4, including two input terminals and output head anode and defeated
Outlet cathode, wherein the anode of diode FD1 and diode FD2 cathode connection are an input terminal, the anode of diode FD4 and
Diode FD3 cathode connection is another input terminal, and the cathode and diode FD4 yin tie point of diode FD1 is anode output
End, the anode and diode FD3 anode tie point of diode FD2 are cathode output end, and alternating current generator 80 is series at exchange input
Hold ACL-IN and ACN-IN into the ac circuit of two input terminals of the second rectification module 30, wherein capacitor FC1 is alternating current
The start-up capacitance of machine 80 is connected in parallel on the starting winding both ends of alternating current generator 80, and alternating current generator is series at ACN-IN and hands in this figure
N line end is flowed, ACL-IN can also be connected on and exchange L line end.
Switch module 40 is mainly by first switch tube IGBT (Insulated Gate Bipolar Transistor) Q2 group
At switching tube Q2 constitutes first switch unit 41, realizes the switching of switch module, and switch module 40 further includes IGBT driving
Circuit, MCU70 drive the switch motion of first switch tube Q2 by pin P1 output pwm signal to IGBT drive circuit.When
When IGBT is connected, the electric current of AC power source output constitutes electricity through alternating current generator 80, the second rectification module 30 and first switch tube Q2
Road is flowed back to, provides power supply for the work of alternating current generator 80.Its current loop is specific as follows: when the electric current of AC power source is from ACL-IN
Exchange L line sets out, the collector and emitter of anode and cathode, first switch tube Q2 through diode FD1, diode FD3
The ACN-IN that anode and cathode, alternating current generator 80 return to AC power source exchanges N line；When the electric current of AC power source is from ACN-IN
Exchange N line set out, through alternating current generator 80, the anode and cathode of diode FD4, first switch tube Q2 collector and emitter,
The anode and cathode of diode FD2, the ACL-IN for returning to AC power source exchange L line.When IGBT cut-off, alternating current generator 80
Induced electromotive force is generated on winding coil, when the current direction difference of above-mentioned AC power source, the winding coil of alternating current generator 80
The induced electromotive force of upper generation corresponds to polarity difference.Here the first switch tube Q2 of switch module 40 is also possible to MOS (metal oxygen
Compound semiconductor) power tube, IGBT driving at this time is corresponding to be changed to MOS drive circuit.
First afterflow module 50 and the second afterflow module 60 are made of first diode FD5 and the second diode FD6 respectively,
Unidirectional conduction function is played, the anode FD5 of first diode is 50 input terminal of the first afterflow module, the yin of first diode FD5
50 output end of extremely the first afterflow module, the anode FD6 of the second diode are 60 input terminal of the second afterflow module, the second diode
The cathode of FD6 is 60 output end of the second afterflow module, and the anode connection for forming the second diode FD6 of the second afterflow module 60 is whole
Flow the negative pole of output end of bridge heap DR1, the first diode FD5 of the first afterflow module 50 of cathode and composition of the second diode FD6
Anode and one end of motor 80 be connected to an input terminal i.e. anode of diode FD4 and diode FD3 of the second rectification module altogether
Cathode connection, the output head anode of the cathode connection rectifier bridge stack DR1 of first diode FD5.
First diode FD5 and the second diode FD6 when switch module 40 is closed, is closed respectively in switch module 40
When alternating current generator 80 winding coil generate opposed polarity induced electromotive force provide continuous current circuit.It is specific as follows: to work as friendship
The current direction in galvanic electricity source is the continuous current circuit from L line when the winding coil of alternating current generator 80 generates induced electromotive force
It is negative to enter DC load 20, DC bus from the rectified bridge heap DR1 cathode output end of L line i.e. the 4th foot, DC bus anode
Pole returns to the N line of AC power source into the anode and cathode of the second diode FD6, alternating current generator 80；When the electric current of AC power source
Direction is from N line when the winding coil of alternating current generator 80 generates induced electromotive force, and continuous current circuit is from N line through handing over
Galvanic electricity machine 80, the anode and cathode of first diode FD5, DC bus anode enter DC load 20, DC bus cathode into
The L line for entering rectifier bridge stack DR1 cathode output end i.e. the 1st foot, eventually passing back to AC power source, the electricity of alternating current generator 80 in continuous current circuit
The current direction flowed when direction is connected with switch module 40 is identical, and induced electromotive force is by rectifier bridge stack DR1 in circuit by bearing
It carries 80 progress afterflows to release, ensure that the reliability service of motor.
In speed-adjusting circuit of alternating provided in an embodiment of the present invention, switch module 40 can also include that the first RC absorbs list
Member 42, the first RC absorptive unit include the second capacitor FC3 and second resistance FR4, and one end of the second capacitor FC3 connects second resistance
One end of FR4, the collector of the other end connection first switch tube Q2 of the second capacitor FC3, the other end connection of second resistance FR4
The emitter of first switch tube Q2.Winding coil when the switching tube of switch module 40 is in cut-off in alternating current generator 80 generates sense
The high voltage for answering electromotive force to be formed, the first absorptive unit can form auxiliary afterflow by the second rectification module 30 to induced electromotive force
It releases, plays inhibition action of high voltage, simultaneously because the winding coil generation induced electromotive force of alternating current generator 80 is whole by second
Flow module 30, which can be transmitted on switch module 40, forms high voltage, therefore the first absorptive unit is also simultaneously to high on switch module 40
Voltage is inhibited, and the high frequency electromagnetic noise that can absorb 40 switching of switch module when is formed, and improves EMC performance.
Speed-adjusting circuit of alternating provided in an embodiment of the present invention can also include the 2nd RC absorption module 90, and the 2nd RC inhales
Receiving module includes third capacitor FC2 and 3rd resistor FR1, and one end of third capacitor FC2 connects one end of 3rd resistor FR1, the
One end of other end connection 80 main winding of alternating current unit of three capacitor FC2, the other end of 3rd resistor FR1 connect alternating current generator
The other end of group main winding 80.It is identical as the effect of the first RC absorptive unit, when the switching tube of switch module 40 cut-off when
When the winding coil of alternating current generator 80 generates the high voltage that induced electromotive force is formed, the first absorptive unit forms induced electromotive force
Afterflow is released, and plays inhibition action of high voltage, while the second absorptive unit can be to induced electromotive force by the second rectification module 30
High voltage on the switching tube of switch module 40 is inhibited, and the high-frequency electrical that can absorb 40 switching of switch module when is formed
Magnetic noise improves EMC performance.
Speed-adjusting circuit of alternating provided in an embodiment of the present invention can also include filter module A0, and filter module A0 is by electricity
Capacitor E1 composition is solved, smothing filtering is carried out to the DC bus-bar voltage after rectifier bridge stack DR1 rectification, to increase filter effect, also
An electrolytic capacitor E2 can be further added by.
Speed-adjusting circuit of alternating provided in an embodiment of the present invention can also include first capacitor C8, the two of first capacitor C8
End is separately connected 50 output end of the first afterflow module and 60 input terminal of the second afterflow module, i.e. first diode FD5
Cathode and the second diode FD6 anode.First capacitor C8, which is played, reduces continuous current circuit hindrance function, is returned with being conducive to afterflow
Road generates the quick afterflow of induced electromotive force progress to the winding coil of alternating current generator 80 and releases.
Speed-adjusting circuit of alternating provided in an embodiment of the present invention is alternating current using the afterflow module being constituted by a diode
Induced electromotive force being generated on machine winding coil, continuous current circuit being provided, continuous current circuit is by existing rectifier bridge stack in circuit and bears
It carries, does not need additionally to increase electronic switch afterflow, cost can be greatly reduced, and do not need the control of MCU in afterflow, it is complete
The high reliablity realized, therefore worked by simple hardware circuit entirely, avoiding control in the prior art causes device failure to be asked
Topic, improves the EMC performance of electric current.
Referring to Fig. 6, Fig. 6 is the circuit modular structure figure that speed-adjusting circuit of alternating 3rd embodiment of the present invention provides, base
In compressor protective circuit first embodiment of the present invention, speed-adjusting circuit of alternating further includes the first PFC module B0, the first PFC
Module B0 is connected between ac input end and the first rectification module 10, and input terminal connects ac input end, output end connection
First rectification module 10 carries out Active PFC with the DC voltage exported for the first rectification module 10.
In the present embodiment according to an input terminal of the second rectification module 30 with input end of motor in the link position for exchanging end
The difference of opposite first PFC module B0 specifically there are two types of connection type, Fig. 6 show the second rectification module 30 an input terminal and
Input end of motor is connected to the ac input end i.e. input end side of the first PFC module B0, and Fig. 8 show the second rectification module 30
One input terminal and input end of motor are connected to the output end of the first PFC module B0, in Fig. 8 to the current supply circuit of motor need by
First PFC module B0.The induced electricity generated on the winding coil of the first PFC module B0 participation alternating current generator 80 in Fig. 6 and Fig. 8
The continuous current circuit of kinetic potential.
Fig. 7 and Fig. 9 is respectively circuit knot of the speed-adjusting circuit of alternating provided in an embodiment of the present invention based on Fig. 6 and Fig. 8
Composition.The speed-adjusting circuit of alternating of opposite Fig. 5, difference are increasing PFC module B0, load 20 physical circuit also not
Together, other modules are same as shown in Figure 5, therefore repeat no more.First PFC module B0 is mainly by the first PFC inductance L1 group
At since it is connected on exchange end, this pfc circuit is passive PFC circuit, is realized by inductance L1 defeated to the first rectification module 10
DC voltage out carries out Active PFC.
Its continuous current circuit and Fig. 5 are a difference in that from ac input end L to rectifier bridge stack in Fig. 7 and circuit shown in Fig. 9
The first PFC inductance L1 is increased between DR1, therefore is increased in its continuous current circuit close to L line input terminal and passed through the first PFC inductance
L1, other are identical as Fig. 5.Circuit described in Fig. 9 need to pass through the first PFC in ac input end due to the current supply circuit of alternating current generator
Inductance L1 can effectively eliminate the clutter that switch module generates during high-speed switch, improve the EMC performance of circuit.
0, Figure 10 is the circuit modular structure figure that speed-adjusting circuit of alternating fourth embodiment of the present invention provides referring to Fig.1,
Based on compressor protective circuit first embodiment of the present invention, speed-adjusting circuit of alternating further includes the second PFC module C0, and second
PFC module C0 is connected between the first rectification module 10 and load 20 by DC bus, i.e. the input terminal of the second PFC module C0
The first rectification module 10 is connected, the output end connection load 20 of the second PFC module C0 is straight to export for the first rectification module 10
Galvanic electricity pressure carries out Active PFC.
Second PFC module C0 is outer in addition to above-mentioned Active PFC effect, may also participate in continuous current circuit, plays and the
One afterflow module 50 and the second afterflow module 60 and the first rectification module 10 form the effect of continuous current circuit.Referring to Fig.1 1, figure
11 be circuit structure diagram of the speed-adjusting circuit of alternating provided in an embodiment of the present invention based on Figure 10.The alternating current generator of opposite Fig. 5
Alignment circuit, difference are increasing by the second PFC module C0, load 20 physical circuit it is also different, other modules are and Fig. 5
Shown in it is identical, therefore repeat no more.
The active PFC electricity that second PFC module C0 is mainly made of the 2nd PFC inductance L2, IGBT switching tube Q1, diode D1
Road, MCU 70 is worked by pin P2 output pwm signal to IGBT drive circuit driving switch pipe Q1, while MCU passes through by electricity
Hinder R1 and resistance R2 and resistance R7 and resistance R8 composition the second PFC module of voltage detecting current detecting C0 input voltage and
Output voltage exports suitable pwm signal with this and controls the second PFC module C0 work.
Load 20 is to form motor mainly by IPM (Intelligent Power Module) and motor form herein
Driving circuit, certain motor are also possible to compressor and form compressor drive circuit.
When the switching tube Q1 of the second PFC module C0 conducting, the second PFC module C0 may also participate in form afterflow time at this time
Road.When the current direction of AC power source is the winding coil generation induced electromotive force from L line in alternating current generator 80, continue
Road is flowed back to from i.e. the 4th foot of the rectified bridge heap DR1 cathode output end of L line, DC bus anode, the 2nd PFC inductance L2, switch
The collector and emitter of pipe Q1, DC bus cathode, resistance R0, the anode and cathode of the second diode FD6, alternating current generator 80
Return to the N line of AC power source；When the current direction of AC power source is to generate to feel in the winding coil of alternating current generator 80 from N line
When answering electromotive force, continuous current circuit is from N line through alternating current generator 80, the anode and cathode of first diode FD5, DC bus
Anode enter the 2nd PFC inductance L2, the collector and emitter of switching tube Q1, DC bus cathode, resistance R0, into rectifier bridge
Heap DR1 cathode output end i.e. the 1st foot, the L line for eventually passing back to AC power source.
If the switching tube Q1 of the second PFC module C0 is not turned on, when continuous current circuit is connected with above-mentioned switching tube Q1 at this time
It is a difference in that without switching tube Q1 but IPM module and motor through overload 20, other circuits composition are same as described above.
Since bleed-off circuit is directly over switching tube without overload in the switching tube conducting of PFC module, let out
The route put shortens, and can reduce line impedance, therefore induced electromotive force is more advantageous to when PFC module participates in being formed bleed-off circuit
Quickly release.
Second PFC module is in addition to participating in continuous current circuit, moreover it is possible to the power supply for participating in alternating current generator 80, together with switch module 40
Work for alternating current generator 80 provides electric current.In Figure 11, for motor power supply current loop in, such as when AC power source electric current from
ACN-IN exchanges N line and sets out, through motor 80, diode FD4, the collector and emitter of first switch tube Q2, diode FD2
The ACL-IN for returning to AC power source exchanges L line and constitutes except current loop, also separates another at diode FD4 anode
Branch is through first diode FD5, DC bus anode, the 2nd PFC inductance L2, the collector and emitter of switching tube Q1, direct current
The ACL-IN that bus cathode, resistance R0, rectifier bridge stack DR1 negative pole of output end return to AC power source exchanges L.Above-mentioned two electric current
Circuit is from an input terminal branch of the second rectification module 30, all the way through the second rectification module 30 and switch module 40, in addition all the way
Through the second PFC module C0, be finally returned to exchange L line, therefore when the conducting of the switching tube of the second PFC module C0, can play for
Switch module 40 shunts left and right, reduces the electric current of the switching tube Q2 by switch module 40, reduces the fever of switching tube Q2 work,
The functional reliability of switch module is improved, while shunting preceding switch pipe Q2 originally relatively to use the power device of relative low-power
Part, the cost of switch module is reduced with this, to reduce entire speed-adjusting circuit of alternating cost.
2, Figure 12 is the circuit modular structure figure that the 5th embodiment of speed-adjusting circuit of alternating of the present invention provides referring to Fig.1,
Based on compressor protective circuit first embodiment of the present invention, relative to the speed-adjusting circuit of alternating of Figure 10, difference exists
Different with the connection line of the second afterflow module 60 in the first afterflow module 50, other modules are same as shown in Figure 10, because
This is repeated no more.
The input terminal of second afterflow module 60 connects the second PFC module C0 negative pole of output end, the second afterflow module 60 it is defeated
Outlet, the input terminal of the first afterflow module 50 and one end of motor 80 are connected to an input terminal of the second rectification module 30 altogether, and first
The output end of afterflow module 50 connects the second PFC module C0 output head anode.
Figure 13 is circuit structure diagram of the speed-adjusting circuit of alternating provided in an embodiment of the present invention based on Figure 12.With Figure 11's
The difference is that the second diode of the second afterflow module 60 of first diode FD5 and composition of the first afterflow module 50 of composition
The connection line of FD6 is different, and specific difference is that the cathode of first diode FD5 connects the diode D1 of the second PFC module C0
Cathode, the anode of the second diode FD6 connects the emitter of the IGBT switching tube Q1 of the second PFC module C0.First diode
The anode of the cathode of FD5 and the second diode FD6 are connected to the output end of the second PFC module C0, therefore its continuous current circuit is by two
Pole pipe D1 isolation, which needs to load, to be participated in, and without going past the IGBT switching tube Q1 of the second PFC module C0, is needed through overload 20
IPM module and motor, other are identical as Figure 11.
4, Figure 14 is the circuit modular structure figure that speed-adjusting circuit of alternating sixth embodiment of the present invention provides referring to Fig.1,
Based on compressor protective circuit first embodiment of the present invention, relative to the speed-adjusting circuit of alternating of Figure 10, difference exists
Different with the connection line of the second afterflow module 60 in the first afterflow module 50, other modules are same as shown in Figure 10, because
This is repeated no more.
The input terminal of second afterflow module 60 connects 10 negative pole of output end of the first rectification module, the second afterflow module 60 it is defeated
Outlet, the input terminal of the first afterflow module 50 and one end of motor 80 are connected to an input terminal of the second rectification module 30 altogether, and first
The output end of afterflow module 50 connects the second PFC module C0 output head anode.
Figure 15 is circuit structure diagram of the speed-adjusting circuit of alternating provided in an embodiment of the present invention based on Figure 14.With Figure 11's
The difference is that the second diode of the second afterflow module 60 of first diode FD5 and composition of the first afterflow module 50 of composition
The connection line of FD6 is different, and specific difference is that the cathode of first diode FD5 connects the diode D1 of the second PFC module C0
Cathode, the anode of the second diode FD6 connects rectifier bridge stack DR1 negative pole of output end.
When the switching tube Q1 of the second PFC module C0 conducting, the second PFC module C0 may also participate in form afterflow time at this time
Road.When the current direction of AC power source is the winding coil generation induced electromotive force from L line in alternating current generator 80, continue
Road is flowed back to from i.e. the 4th foot of the rectified bridge heap DR1 cathode output end of L line, DC bus anode, the 2nd PFC inductance L2, switch
Collector and emitter, DC bus cathode, the anode and cathode of the second diode FD6, the alternating current generator 80 of pipe Q1 returns to friendship
The N line in galvanic electricity source；When the current direction of AC power source is the winding coil generation induction electric from N line in alternating current generator 80
When gesture, since the cathode of first diode FD5 connects the cathode of the diode D1 of the second PFC module C0, continuous current circuit is not at this time
Switching tube Q1 can be passed through, need to be through the IPM module of overload 20, specially its continuous current circuit is from N line through alternating current generator 80, the
The anode and cathode of one diode FD5, DC bus anode enter the IPM module and motor, DC bus cathode, electricity of load 20
Resistance R0, into rectifier bridge stack DR1 cathode output end i.e. the 1st foot, eventually pass back to the L line of AC power source.
If the switching tube Q1 of the second PFC module C0 is not turned on, when continuous current circuit is connected with above-mentioned switching tube Q1 at this time
It is a difference in that without switching tube Q1 but IPM module and motor through overload 20, other circuits composition are same as described above.
It is similar with Figure 11, since the bleed-off circuit from alternating current L line is directly passed through in the switching tube conducting of PFC module
Switching tube is crossed without overload, therefore its route released shortens, line impedance can be reduced, therefore when PFC module participates in being formed
Quickly releasing for induced electromotive force is more advantageous to when bleed-off circuit.
The present invention also provides a kind of air conditioner, including above-mentioned speed-adjusting circuit of alternating, specific embodiment can join
Above-described embodiment is examined, details are not described herein.
In the description of this specification, the description meaning of reference term " first embodiment ", " second embodiment ", " example " etc.
Refer to specific method, device or feature described in conjunction with this embodiment or example be contained at least one embodiment of the present invention or
In example.In the present specification, the schematic representation of the above terms does not necessarily have to refer to the same embodiment or example.And
And specific features, method, apparatus or the feature of description can be in any one or more of the embodiments or examples with suitable sides
Formula combines.In addition, without conflicting with each other, those skilled in the art can will be described in this specification different real
The feature for applying example or example and different embodiments or examples is combined.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (12)
1. a kind of speed-adjusting circuit of alternating, which is characterized in that the speed-adjusting circuit of alternating includes ac input end, first
Rectification module, load, the second rectification module, switch module, the first afterflow module, the second afterflow module and MCU；
First rectification module exports direct current after rectifying to the alternating current for the AC power source that the ac input end inputs
Two output ends of electricity, first rectification module connect DC bus, to provide power supply for loaded work piece；
Second rectification module exports direct current after rectifying to the alternating current for the AC power source that the ac input end inputs
Electricity, two output end connection switch modules of second rectification module provide power supply for switch module work；
The switch module realizes that switch state switches under the control of the MCU, by the AC power source, second rectification
Module and the switch module form the power supply circuit of the alternating current generator, and in switch module conducting, the exchange
Power supply circuit of the alternating current of power supply through the alternating current generator is alternating current generator power supply；
The first afterflow module and the second afterflow module include input and output side, the first afterflow module and the second afterflow
Module is unidirectional conduction, and electric current is inputted from the input terminal of the first afterflow module or the second afterflow module, continuous from described first
Flow module or the output of the output end of the second afterflow module；In switch module cut-off, the winding coil of the alternating current generator
The induced electromotive force of upper generation carries out afterflow by the first afterflow branch or the second afterflow branch and releases, the first afterflow branch
Including the first afterflow module, first rectification module and the load, the second afterflow branch includes second afterflow
Module, first rectification module and the load；The input terminal of the first afterflow module and the second afterflow module
Output end connects the power supply circuit of the alternating current generator, the output end of the first afterflow module and the second afterflow module
Input terminal connects the DC bus, the output end of the second afterflow module, the input terminal of the first afterflow module and institute
The one end for stating motor is connected to an input terminal of second rectification module altogether, described in the input terminal connection of the second afterflow module
First rectification module negative pole of output end, the output end of the first afterflow module connect the first rectification module output and rectify
Pole.
2. speed-adjusting circuit of alternating as described in claim 1, which is characterized in that the speed-adjusting circuit of alternating further includes
First PFC module；
First PFC module is connected between the ac input end and first rectification module, with whole for described first
The DC voltage of flow module output carries out Active PFC.
3. speed-adjusting circuit of alternating as described in claim 1, which is characterized in that the speed-adjusting circuit of alternating further includes
Second PFC module；
Second PFC module is connected between first rectification module and load by the DC bus, to be described
The DC voltage of first rectification module output carries out Active PFC.
4. speed-adjusting circuit of alternating as claimed in claim 3, which is characterized in that
The input terminal of the first afterflow module connects the input terminal of second rectification module, the first afterflow module it is defeated
Outlet connects the output head anode of first rectification module；
The input terminal of the second afterflow module connects the negative pole of output end of first rectification module, the second afterflow module
Output end connect the input terminal of second rectification module.
5. speed-adjusting circuit of alternating as claimed in claim 3, which is characterized in that
The input terminal of the first afterflow module connects the input terminal of second rectification module, the first afterflow module it is defeated
Outlet connects the output head anode of second PFC module；
The input terminal of the second afterflow module connects the negative pole of output end of second PFC module, the second afterflow module
Output end connect the input terminal of second rectification module.
6. speed-adjusting circuit of alternating as described in claim 1, which is characterized in that the speed-adjusting circuit of alternating further includes
Filter module；
The filter module is connected between first rectification module and load by the DC bus, for described first
The DC voltage of rectification module output carries out smothing filtering.
7. speed-adjusting circuit of alternating as described in claim 1, which is characterized in that the first afterflow module includes the one or two
Pole pipe, the second afterflow module include the second diode；
The anode of the first diode is the first afterflow module input, and the cathode of the first diode is described the
One afterflow module output end；
The anode of second diode is the second afterflow module input, and the cathode of second diode is described the
Two afterflow module output ends.
8. speed-adjusting circuit of alternating as claimed in claim 7, which is characterized in that the speed-adjusting circuit of alternating further includes
First capacitor；
The both ends of the first capacitor are separately connected the first afterflow module output end and the second afterflow module input.
9. speed-adjusting circuit of alternating as described in claim 1, which is characterized in that the switch module includes first switch list
Member and the first RC absorptive unit；
The first switch unit realizes the switching of switch module；
The first RC absorptive unit is parallel to first switch unit both ends, for absorbing the first switch unit switch
The high voltage generated when switching at first switch unit both ends and the main winding both ends of the alternating current generator.
10. speed-adjusting circuit of alternating as claimed in claim 9, which is characterized in that the first RC absorptive unit includes the
Two capacitors and second resistance；
One end of one end connection second resistance of second capacitor, the other end of second capacitor connect the first switch
One end of unit, the other end of the second resistance connect the other end of the first switch unit.
11. speed-adjusting circuit of alternating as described in claim 1, which is characterized in that the speed-adjusting circuit of alternating also wraps
Include the 2nd RC absorption module；
The 2nd RC absorption module is parallel to the alternating current unit main winding both ends, for absorbing the switch module switch
The high voltage generated when switching at the main winding both ends of the alternating current generator and the switch module both ends.
12. a kind of air conditioner, which is characterized in that the air conditioner includes the alternating current generator as described in claim 1 to 11 is any
Alignment circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710182522.1A CN106849831B (en) | 2017-03-23 | 2017-03-23 | Speed-adjusting circuit of alternating and air conditioner |
| PCT/CN2017/082565 WO2018171003A1 (en) | 2017-03-23 | 2017-04-28 | Alternating-current (ac) motor speed regulating circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710182522.1A CN106849831B (en) | 2017-03-23 | 2017-03-23 | Speed-adjusting circuit of alternating and air conditioner |
Publications (2)
| Publication Number | Publication Date |
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| CN106849831A CN106849831A (en) | 2017-06-13 |
| CN106849831B true CN106849831B (en) | 2019-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710182522.1A Active CN106849831B (en) | 2017-03-23 | 2017-03-23 | Speed-adjusting circuit of alternating and air conditioner |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107659239B (en) * | 2017-10-16 | 2023-11-28 | 广东美的制冷设备有限公司 | Speed regulating circuit of alternating current motor |
| CN109980913B (en) * | 2017-12-27 | 2021-11-02 | 中兴通讯股份有限公司 | Switching power supply and voltage output method |
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|---|---|---|---|---|
| US3536972A (en) * | 1968-12-09 | 1970-10-27 | Warner Swasey Co | Sample and hold voltage circuit for controlling variably energized load |
| CN1064773A (en) * | 1992-04-07 | 1992-09-23 | 张才良 | The dc motor drive of Alternating Current Power Supply |
| CN105282937A (en) * | 2015-11-13 | 2016-01-27 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method thereof |
| CN205647333U (en) * | 2016-03-31 | 2016-10-12 | 广东美的环境电器制造有限公司 | Motor speed regulating device and domestic appliance |
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2017
- 2017-03-23 CN CN201710182522.1A patent/CN106849831B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3536972A (en) * | 1968-12-09 | 1970-10-27 | Warner Swasey Co | Sample and hold voltage circuit for controlling variably energized load |
| CN1064773A (en) * | 1992-04-07 | 1992-09-23 | 张才良 | The dc motor drive of Alternating Current Power Supply |
| CN105282937A (en) * | 2015-11-13 | 2016-01-27 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method thereof |
| CN205647333U (en) * | 2016-03-31 | 2016-10-12 | 广东美的环境电器制造有限公司 | Motor speed regulating device and domestic appliance |
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