CN107733319A - Speed-adjusting circuit of alternating and air conditioner - Google Patents
Speed-adjusting circuit of alternating and air conditioner Download PDFInfo
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- CN107733319A CN107733319A CN201711005285.8A CN201711005285A CN107733319A CN 107733319 A CN107733319 A CN 107733319A CN 201711005285 A CN201711005285 A CN 201711005285A CN 107733319 A CN107733319 A CN 107733319A
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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
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Abstract
The invention provides speed-adjusting circuit of alternating and air conditioner, including the first rectification circuit, on-off circuit, freewheeling circuit, drive circuit, low-tension supply and, second rectification circuit and load, by setting isolation module and bootstrap module on drive circuit, the drive signal and MCU control signals of on-off circuit are isolated by isolation module, and bootstrap module is boosted to realize the normal power supply to personal module to the low-voltage DC of low-tension supply input automatically within one of them half period that AC power inputs, realize the normal work of whole circuit, need to increase single powered by direct current branch road in compared with the prior art, reduce circuit cost.
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, and when physical circuit is realized, the drive end of its resistance switch needs and controlled
The power supply power supply of device power supply independence processed, independent one group of winding output, increase are needed so when setting low-tension supply
The whole circuit design cost of low-tension supply.
The content of the invention
It is a primary object of the present invention to provide a kind of speed-adjusting circuit of alternating i.e. air conditioner, it is therefore intended that solve existing
Speed-adjusting circuit of alternating needs the driving to electronic switch to be related to single out-put supply when physical circuit designs causes electricity
The problem of source circuit design cost is higher.
To achieve the above object, a kind of speed-adjusting circuit of alternating provided by the invention, the speed-adjusting circuit of alternating
Including the first rectification circuit, on-off circuit, freewheeling circuit, drive circuit, low-tension supply, MCU, the second rectification circuit and load；
First rectification circuit is used to export direct current after carrying out rectification to the alternating current of input, thinks the switch electricity
Road work provides power supply；
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；
The low-tension supply is used to the direct current of second rectification circuit output is carried out being converted into low-voltage DC, with
For the MCU and drive circuitry, the direct current that the low-voltage DC exports with second rectification circuit is altogether；
The on-off circuit realizes that on off state switches under the control of the MCU, and when the on-off circuit turns on,
The alternating current of the input is powered through first rectification circuit and on-off circuit to alternating current generator, is disconnected in the on-off circuit
When, caused induced electromotive force passes through the freewheeling circuit, the second rectification circuit and load and carried out in the AC Electrical Machine Winding
Release, the freewheeling circuit is unidirectional conduction；
The drive circuit is used for the switching for driving the on-off circuit to carry out on off state under MCU controls, and to institute
The drive signal and MCU control signals for stating on-off circuit are isolated, and the low-voltage DC to low-tension supply output
Boosted to realize that the drive end to the on-off circuit is powered.
In a kind of possible design, the drive circuit includes isolation module and bootstrap module；
The isolation module is used to isolate the drive signal and MCU control signals of on-off circuit；
The boostrap circuit is used to boost to the low-voltage DC of low-tension supply input to be opened described with realizing
The drive end power supply on powered-down road.
In a kind of possible design, the isolation module includes optocoupler and first resistor；
Described first resistor one end connects the MCU control signal outputs, and the resistance other end connects the optocoupler
Input anode, the optocoupler input cathode ground connection；
The output end of the optocoupler connects the on-off circuit drive end；
The output end power supply of the optocoupler connects the bootstrap module output end.
In a kind of possible design, the isolation module also includes second resistance and the first electric capacity；
The second resistance both ends, the first electric capacity both ends are in parallel with the both ends of the input of the optocoupler.
In a kind of possible design, the bootstrap module includes the 3rd diode, 3rd resistor and the second electric capacity；
3rd diode anode connects the low-tension supply output head anode, and the 3rd diode cathode connects institute
State 3rd resistor one end, the 3rd resistor other end is connected with second capacitance cathode, the 3rd resistor other end with
The second capacitance cathode tie point is the bootstrap module cathode output end；
The second electric capacity negative pole is connected with the first rectification circuit output end negative pole, the second electric capacity negative pole and institute
State the cathode output end that the first rectification circuit output end negative pole tie point is the bootstrap module.
In a kind of possible design, the bootstrap module also includes the 3rd electric capacity；
The 3rd electric capacity both ends are in parallel with the second electric capacity both ends.
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 speed-adjusting circuit of alternating also includes pfc circuit；
The pfc circuit is connected between second rectification circuit and the load, thinks second rectification circuit
The DC voltage of output carries out Active PFC.
In a kind of possible design, the first afterflow module also includes the 7th resistance；
7th resistance and first 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 rectification circuit, on-off circuit, freewheeling circuit, driving
Circuit, low-tension supply and, the second rectification circuit and load, on-off circuit realizes that on off state switches under MCU control, and
When on-off circuit turns on, the alternating current of input is powered through the first rectification circuit and on-off circuit to alternating current generator, in on-off circuit
During disconnection, caused induced electromotive force is released by freewheeling circuit, the second rectification circuit and load in AC Electrical Machine Winding,
Realize the normal speed governing to motor, and further by setting isolation module and bootstrap module on drive circuit, by every
The drive signal of on-off circuit and MCU control signal are isolated from module, and bootstrap module inputs in AC power
One of them half period in automatically to low-tension supply input low-voltage DC boosted with realize to personal module just
Often power supply, realize the normal work of whole circuit, compared with the prior art in need to increase single powered by direct current branch road, drop
Low circuit cost.
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 circuit modular structure figure of speed-adjusting circuit of alternating fourth embodiment of the present invention；
Fig. 3 is the circuit modular structure figure of the embodiment of speed-adjusting circuit of alternating the 5th of the present invention.
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 10, on-off circuit 20, freewheeling circuit 30, drive
Dynamic circuit 50, low-tension supply 80 and MCU40, the second rectification circuit 60 and load 70；
First rectification circuit 10 is used to export direct current after carrying out rectification to the alternating current of input, thinks the work of on-off circuit 20
Offer power supply is provided, the first rectification circuit 10 can be discrete full bridge rectifier or integrated rectifier bridge stack module here,
First rectification circuit 10 includes two ac input ends, and DC output end positive pole and DC output end negative pole.
Second rectification circuit 60 is used to export direct current after carrying out rectification to the alternating current of input, thinks that the work of load 70 carries
Power supply source, the second rectification circuit 60 can be discrete full bridge rectifier or integrated rectifier bridge stack as shown in Figure 1 here
Module DR1, the second rectification circuit 60 include two ac input ends, and DC output end positive pole and DC output end negative pole,
Here load 70 loads such as motor of DC operation or the physical circuit of other direct current supplys for direct current supply, no
It is simple load, such as switching power circuit, motor-drive circuit, compressor drive circuit；
Low-tension supply 80 be used to the direct current of the second rectification circuit 60 output be converted into low-tension supply for MCU40 with
And drive circuit 50 is powered, low-tension supply 80 and the direct current altogether, i.e., the negative pole and the first rectified current that low-tension supply 80 exports
The negative pole of output end of road 10 connects altogether, and low-tension supply 80 can be Switching Power Supply here, exportable two-way direct current in Fig. 1, wherein 5V
MCU is supplied, 12V supply drive circuits 50 and other circuits work；
On-off circuit 20 realizes that on off state switches under MCU40 control, and when on-off circuit 20 turns on, input
Alternating current is powered through the first rectification circuit 10 and on-off circuit 20 to alternating current generator 90, when on-off circuit 20 disconnects, alternating current
Caused induced electromotive force is released by freewheeling circuit 30, the second rectification circuit 60 and load 70 on the winding of machine 90, afterflow
Circuit 30 is unidirectional conduction；
Drive circuit 50 is used for the switching that the driving switch circuit 20 under MCU40 controls carries out on off state, and to switch
The drive signal and MCU40 control signals of circuit 20 are isolated, and the direct current to being inputted from low-tension supply 80 rises
Press to realize the drive end power supply to switch module 20.
Specifically, as shown in figure 1, the drive circuit 50 includes isolation module 51 and bootstrap module 5252；
The isolation module 51 is used to isolate the drive signal and MCU40 control signals of on-off circuit 20；
The boostrap circuit is used to boost to realize to described to the low-voltage DC of the low-tension supply 80 input
The drive end power supply of on-off circuit 20.
Isolation module 51 includes optocoupler FU1 and first resistor FR8；First resistor FR8 one end connection MCU40 control signals are defeated
Go out end, resistance other end connection optocoupler FU1 input anode, optocoupler FU1 input cathode ground connection；
The optocoupler FU1 drive end of output end connecting valve circuit 20；
The optocoupler FU1 output end power supply connection output end of bootstrap module 52.
Bootstrap module 52 includes the 3rd diode FD7,3rd resistor FR9 and the second electric capacity E3；
The 3rd diode FD7 anodes connect the output head anode of low-tension supply 80, and the 3rd diode FD7 is cloudy
Pole connects described 3rd resistor FR9 one end, and the 3rd resistor FR9 other ends are connected with the second electric capacity E3 positive poles, described
The 3rd resistor FR9 other ends and the second electric capacity E3 positive poles tie point are the cathode output end of bootstrap module 52；
The second electric capacity E3 negative poles are connected with the negative pole of output end of the first rectification circuit 10, and the second electric capacity E3 is born
Pole and the cathode output end that the negative pole of output end tie point of the first rectification circuit 10 is the bootstrap module 5252.
Specifically, on-off circuit 20 is mainly by first switch pipe IGBT (Insulated Gate Bipolar
Transistor) Q2 is formed, and switching tube Q2 realizes the switch switching of on-off circuit 20, and MCU40 passes through pin P1 output pwm signals
To drive circuit 50 to drive first switch pipe Q2 switch motion, first switch pipe Q2, can also except being managed for IGBT here
It is MOS (metal-oxide semiconductor (MOS)) pipes, with respect to metal-oxide-semiconductor, IGBT pipes can bear bigger electric current.
The concrete operating principle of drive circuit 50 is as follows：
When MCU40 output control signal high level signals, it is input to the optocoupler FU1 of the isolation module 51 of drive circuit
So that input diode current flow, and then cause optocoupler FU1 output end conducting, the 12V DC electricity loading of low-tension supply output
In the output head anode of bootstrap module 52, its optocoupler FU1 output end output high level signal causes first switch pipe Q2 to turn on.
Now, when the AC power sense of current be from N lines i.e. from ACN-IN when, its alternating current is through two loops
L lines i.e. ACL-IN ends are returned to, the first loop is to be inputted through the second rectification circuit 60 from the pin of its rectifier bridge stack DR1 the 2nd, from the 4th pin
Output returns to the 1st pin through load 70, returns L lines, the direct current ground wire of the output of the second rectification circuit 60 is the C in figure here
Point returns to L lines by the one of diodes of rectifier bridge stack DR1, therefore its C point voltage diode high with respect to L line ends
Economize on electricity pressure such as 0.7V, and the direct current ground wire that low-tension supply 80 exports is identical with C points, the 12V that now low-tension supply 80 exports is straight
Stream electricity is higher by 12V voltages relative to C point voltages, i.e., now 12V 12.7Vs high with respect to L line ends.And in second loop, exchange
Electricity returns to from first switch pipe Q2 of the N lines through alternating current generator 90, the output head anode of the first rectification circuit 10 to on-off circuit
The negative pole of output end of first rectification circuit 10, then L lines are returned to through a diode FD2 inside the first rectification circuit 10, due to
Its C, E pole both end voltage is very low when one switching tube Q2 is turned on can be as only having below 0.2V can be ignored, therefore the in figure
It is also the economize on electricity pressure such as 0.7V of a high diode that the negative pole of output end of one rectification circuit 10, which is B point voltages with respect to L line ends, i.e., this
When B point voltages it is identical with C point voltages, therefore the 12V DC electricity that low-tension supply 80 exports is also with respect to the high 12V voltages of B point voltages, by
Connect altogether in the negative pole of output end that the cathode output end of bootstrap module is A points and the first rectification circuit 10, therefore now 12V DC electricity
With respect to the A high 12V of point, thus now the 3rd diode FD7 conductings of bootstrap module, 12V voltages are by the 3rd diode FD7 to the
Two electric capacity E3 charge, if the economize on electricity pressure of the 3rd diode FD7 conductings is 0.7V, the voltage on the second electric capacity E3 can reach phase
To high 11.3V of A points or so, now the output head anode voltage of bootstrap module 52 is higher by 12V or so with respect to ac input end L lines, its
Output end voltage is carried in the optocoupler FU1 output end powers end of isolation module 51 so that optocoupler FU1 output high level control first
Switching tube Q2 is turned on.
And when the AC power sense of current be from L lines i.e. from ACL-IN when, its alternating current equally through two return
Road returns to N lines i.e. ACN-IN ends, and the first loop is to be inputted through the second rectification circuit 60 from the pin of its rectifier bridge stack DR1 the 3rd, from the 4th
Pin output returns to the 1st output end through load 70, returns N lines, here the section of its C point voltage diode high with respect to N line ends
The 12V DC electricity of voltage such as 0.7V, i.e. low-tension supply 80 output is higher by 12.7V voltages relative to N line ends.And in second loop
In, alternating current returns the first rectification circuit 10 from L lines through the first rectification circuit 10, first switch pipe Q2, and through exchange
Motor 90 returns to N lines, and due to have passed through alternating current generator 10 before N lines are returned to, and alternating current generator 10 bears most friendships
Magnitude of voltage is flowed, therefore is now that B points are very high as instantaneous voltage can be higher by N lines with respect to N line ends from the output end of the first rectification circuit 10
More than 220V is held, therefore now A point voltages with respect to N lines are also more than 220V, and 12V DC electricity is just higher by relative to N line ends
12.7V voltages, now the voltage of A points to be higher by much with respect to 12V DC electricity, the 3rd diode FD7 cut-offs, and working as alternating current
Ource electric current direction be from N lines when the second electric capacity E3 on voltage be charged to 11.3V or so, therefore now bootstrap module 52 exports
Rectifying pole tension will raise much with respect to 12V DC voltage, and still be higher by filling on the second electric capacity E3 with respect to its negative pole of output end
Piezoelectric voltage, this control source are carried in the optocoupler FU1 output end powers end of isolation module 51, still high to maintain optocoupler FU1 to export
Automatic level control first switch pipe Q2 is turned on, if without the circuit of bootstrap module 52, now 12V DC voltage can not be realized to optocoupler
FU1 output end power normal power supplies, thus the Q2 conductings of driving first switch pipe can not be realized, and then whole alternating current generator is adjusted
Fast circuit normally controlled motor 90 can not work.If, can be by increasing in low-tension supply 80 certainly without bootstrap module 52
Add individually to export all the way and be loaded into the realization of optocoupler FU1 output end powers, if, it is necessary to again when low-tension supply 80 is Switching Power Supply
Its switch transformer increases a single winding output branch road and increases the output rectifier and filter realization of correlation, and this is undoubtedly
Cost can be increased.And the bootstrap module 52 of the present embodiment only needs the diode, resistance, electric capacity of increase low cost to realize exchange
Power supply from L lines when, it is carried in voltage of the optocoupler FU1 output ends with respect to DC power supply terminal output end to automatic lifting, realize
Its normal work is maintained, reduces the cost of whole circuit.
The speed-adjusting circuit of alternating of the embodiment of the present invention, by including the first rectification circuit 10, on-off circuit 20, afterflow
Circuit 30, drive circuit 50, low-tension supply 80 and MCU40, the second rectification circuit 60 and load 70, on-off circuit 20 is in MCU40
Control under realize that on off state switches, and when on-off circuit 20 turns on, the alternating current of input is through the He of the first rectification circuit 10
On-off circuit 20 is powered to alternating current generator 90, when on-off circuit 20 disconnects, caused induction electric on the winding of alternating current generator 90
Gesture is released by freewheeling circuit 30, the second rectification circuit 60 and load 70, is realized the normal speed governing to motor 90, is gone forward side by side
One step on drive circuit 50 by setting isolation module 50 and bootstrap module 52, by isolation module 51 to on-off circuit 20
Drive signal and MCU40 control signals are isolated, and one of them half period that bootstrap module 52 inputs in AC power
The low-voltage DC inside inputted automatically to low-tension supply 80 is boosted to realize the normal power supply to personal module 50, is realized
The normal work of whole circuit, compared with the prior art in need to increase single powered by direct current branch road, reduce circuit cost.
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, as shown in figure 1, isolation module 51 also includes second resistance FR7 and the first electric capacity C7；Second resistance FR7 two
End, the first electric capacity C7 both ends are in parallel with the both ends of optocoupler FU1 input, and second resistance FR7 is used to realize when MCU40 exists here
When not having output control signal, such as MCU40 does not have output control signal also during upper electricity, and now FR7 ensure that by ground connection
The reliable cut-off of its optocoupler FU1 input diodes, prevent during this period because MCU40 or other interference signals cause optocoupler
FU1, which is surprisingly turned on, causes control disorder.And electric capacity C7 be low capacity filter capacitor such as 0.1uF with lower porcelain slice or ROHS
Play the interference spiking filter action to MCU40 control signal outputs.
Further, bootstrap module 52 also includes the 3rd electric capacity FC4；3rd electric capacity FC4 both ends and the second electric capacity E3 both ends
It is in parallel.Here the 3rd electric capacity FC4 is the filter capacitor of low capacity, plays and the charging voltage signal on the second electric capacity E3 is filtered
Ripple or so so that its voltage is according to smooth steady.
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 1, freewheeling circuit 30 specifically includes the first afterflow module 31 and the second afterflow module 32；First
Afterflow module 31 includes the first diode, and the anode of the first diode is the input of the first afterflow module 31, the first diode
Negative electrode is the output end of the first 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 when AC power is powered from N lines and from L lines to alternating current generator 90 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 90
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. 2
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 90
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 90
60th, the afterflow module 32 of load 70 and second is released.
Further, based on speed-adjusting circuit of alternating first embodiment of the present invention, speed-adjusting circuit of alternating of the present invention
In fourth embodiment, as shown in Fig. 2 speed-adjusting circuit of alternating also includes pfc circuit 80；It is whole that pfc circuit 80 is connected on second
Between current circuit 60 and load 70, think that the DC voltage of the second rectification circuit 60 output carries out Active PFC.Here
Load 70 is the load such as motor of DC operation or the physical circuit of other direct current supplys of direct current supply, is not single
Pure load, such as switching power circuit, motor-drive circuit, compressor drive circuit.Pfc circuit 80 is except above-mentioned power
Factor correction effect is outer, may also participate in continuous current circuit, plays and the first afterflow module 31 and the second afterflow module 32 and the
Two rectification circuits 60 form the effect of continuous current circuit.
Specifically, the active PFC electricity that pfc circuit 80 is mainly made up of PFC inductance L2, IGBT switching tubes Q1, diode D1
Road, MCU 40 is worked by pin P2 output pwm signals to IGBT drive circuit driving switch pipe Q1, while MCU passes through by electricity
Hinder input voltage and the output of the voltage detecting current detecting pfc circuit 80 of R1 and resistance R2 and resistance R7 and resistance R8 compositions
Voltage, suitable pwm signal control pfc circuit 80 is exported with this and worked.
Physical circuit shown in Fig. 2 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 formation is compressed
The drive circuit of machine, certain compressor can also be that direct current generator forms direct current motor drive circuit.
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 90 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 90, is connected in parallel on the startup winding both ends of alternating current generator 90, 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.
When first switch pipe Q2 is turned on, the electric current of AC power output is through alternating current generator 90, the and of the first rectification circuit 10
First switch pipe Q2 forms current loop, and power supply is provided for the work of alternating current generator 90.Its current loop is specific as follows：Work as alternating current
The electric current in source from ACL-IN i.e. exchange L lines, anode and negative electrode through diode FD1, first switch pipe Q2 colelctor electrode and
The ACN-IN that emitter stage, diode FD3 anode return to AC power with negative electrode, alternating current generator 90 exchanges N lines；Work as alternating current
The electric current in source exchanges N lines from ACN-IN, through alternating current generator 90, diode FD4 anode and negative electrode, first switch pipe Q2
Collector and emitter, diode FD2 anode and negative electrode, the ACL-IN that returns to AC power exchange L lines.
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 90.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 90 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 second diode FD6 anode and negative electrode, diode FD3 anode and negative electrode, alternating current
Machine 90 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 90
During raw induced electromotive force, its continuous current circuit is from N lines through alternating current generator 90, diode FD4 anode and negative electrode, the one or two pole
Pipe FD5 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 90 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 80, 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 80 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 90,3rd resistor FR1 other end connection alternating current
The other end of the main winding 50 of machine 90.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 90 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, based on speed-adjusting circuit of alternating fourth embodiment of the present invention, speed-adjusting circuit of alternating of the present invention
In 5th embodiment, as shown in figure 3, the first afterflow of speed-adjusting circuit of alternating module 31 also includes the 7th resistance R9, the 7th electricity
Resistance R9 connects with the first diode FD5 of the first afterflow module 31, and the first diode FD5 connects with the 7th resistance R9, the in Fig. 3
One diode FD5 negative electrode connects the 7th resistance R9 one end, and the 7th resistance R9 other ends are defeated as the first afterflow module 31
Go out end；In addition to the first diode FD5 in such as Fig. 3 and the 7th resistance R9 series systems, the 7th resistance R9 can also be connected to
One diode FD5 anode-side, the input of such 7th resistance R9 one end as the first afterflow module 31.
Due to filter circuit also be present in the speed-adjusting circuit of alternating shown in Fig. 3, 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. 3 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 first diode FD5 in the first afterflow module 31 in circuit as shown in Figure 3
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 (10)
1. a kind of speed-adjusting circuit of alternating, its spy is being, the speed-adjusting circuit of alternating includes the first rectification circuit, opened
Powered-down road, freewheeling circuit, drive circuit, low-tension supply, MCU, the second rectification circuit and load；
First rectification circuit is used to export direct current after carrying out rectification to the alternating current of input, thinks the on-off circuit work
Offer power supply is provided；
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；
The low-tension supply is used to the direct current of second rectification circuit output is carried out being converted into low-voltage DC, thinks institute
MCU and drive circuitry are stated, the direct current that the low-voltage DC exports with second rectification circuit is altogether；
The on-off circuit realizes that on off state switches under the control of the MCU, and when the on-off circuit turns on, it is described
The alternating current of input is powered through first rectification circuit and on-off circuit to alternating current generator, when the on-off circuit disconnects,
Caused induced electromotive force is let out by the freewheeling circuit, the second rectification circuit and load in the AC Electrical Machine Winding
Put, the freewheeling circuit is unidirectional conduction；
The drive circuit is used to drive the on-off circuit to carry out the switching of on off state under MCU controls, and opens described
The drive signal and MCU control signals on powered-down road are isolated, and the low-voltage DC of low-tension supply output is carried out
Boost to realize the drive end power supply to the on-off circuit.
2. speed-adjusting circuit of alternating as claimed in claim 1, it is characterised in that the drive circuit include isolation module and
Bootstrap module；
The isolation module is used to isolate the drive signal and MCU control signals of on-off circuit；
The boostrap circuit is used to boost to the low-voltage DC of low-tension supply input to realize to the switch electricity
The drive end power supply on road.
3. speed-adjusting circuit of alternating as claimed in claim 2, it is characterised in that the isolation module includes optocoupler and first
Resistance；
Described first resistor one end connects the MCU control signal outputs, and the resistance other end connects the defeated of the optocoupler
Enter proper pole, the input cathode ground connection of the optocoupler；
The output end of the optocoupler connects the on-off circuit drive end；
The output end power supply of the optocoupler connects the bootstrap module output end.
4. speed-adjusting circuit of alternating as claimed in claim 3, it is characterised in that the isolation module also includes second resistance
With the first electric capacity；
The second resistance both ends, the first electric capacity both ends are in parallel with the both ends of the input of the optocoupler.
5. speed-adjusting circuit of alternating as claimed in claim 2, it is characterised in that the bootstrap module includes the three or two pole
Pipe, 3rd resistor and the second electric capacity；
3rd diode anode connects the low-tension supply output head anode, the 3rd diode cathode connection described the
Three resistance one end, the 3rd resistor other end are connected with second capacitance cathode, the 3rd resistor other end with it is described
Second capacitance cathode tie point is the bootstrap module cathode output end；
The second electric capacity negative pole is connected with the first rectification circuit output end negative pole, the second electric capacity negative pole and described the
One rectification circuit output end negative pole tie point is the cathode output end of the bootstrap module.
6. speed-adjusting circuit of alternating as claimed in claim 5, it is characterised in that the bootstrap module also includes the 3rd electricity
Hold；
The 3rd electric capacity both ends are in parallel with the second electric capacity both ends.
7. speed-adjusting circuit of alternating as claimed in claim 1, it is characterised in that the freewheeling circuit includes the first afterflow mould
Block 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.
8. speed-adjusting circuit of alternating as claimed in claim 7, 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 circuit output
DC voltage carry out Active PFC.
9. speed-adjusting circuit of alternating as claimed in claim 8, it is characterised in that the first afterflow module also includes the 7th
Resistance；
7th resistance and first Diode series.
10. a kind of air conditioner, it is characterised in that the alternating current generator that the air conditioner is included as described in claim 1 to 9 is any is adjusted
Fast circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005285.8A CN107733319B (en) | 2017-10-23 | 2017-10-23 | AC motor speed regulation circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005285.8A CN107733319B (en) | 2017-10-23 | 2017-10-23 | AC motor speed regulation circuit and air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107733319A true CN107733319A (en) | 2018-02-23 |
| CN107733319B CN107733319B (en) | 2020-06-23 |
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ID=61213648
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711005285.8A Active CN107733319B (en) | 2017-10-23 | 2017-10-23 | AC motor speed regulation circuit and air conditioner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880393A (en) * | 2018-06-13 | 2018-11-23 | 广东美的制冷设备有限公司 | Interleaved PFC control circuit and motor-drive circuit |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
Citations (3)
| 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 |
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2017
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Patent Citations (3)
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880393A (en) * | 2018-06-13 | 2018-11-23 | 广东美的制冷设备有限公司 | Interleaved PFC control circuit and motor-drive circuit |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107733319B (en) | 2020-06-23 |
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