CN106602903A - Air purifier and control device and method of ion generator - Google Patents
Air purifier and control device and method of ion generator Download PDFInfo
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- CN106602903A CN106602903A CN201611255806.0A CN201611255806A CN106602903A CN 106602903 A CN106602903 A CN 106602903A CN 201611255806 A CN201611255806 A CN 201611255806A CN 106602903 A CN106602903 A CN 106602903A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
The invention discloses a control device of an ion generator. The control device comprises a switching power supply, a booster unit, a current collection unit and a control unit, wherein the switching power supply is connected with an AC power supply and is used for converting AC into DC; the booster unit is connected with the switching power supply and the ion generator and is used for boosting the DC to provide the ion generator with electricity; the current collection unit is connected between the switching power supply and the booster unit and is used for collecting filtered current output current of the switching power supply; and the control unit is connected with the booster unit and the current collection unit and is used for filtering the current output current of the switching power supply according to a default kalman filtering algorithm, calculating power of the ion generator according to the filtered current output current and controlling the booster unit according to the power of the ion generator, thereby accurately collecting the power of the ion generator and effectively preventing the ion generator from being damaged by power fluctuation. The invention further discloses an air purifier and a control method of the ion generator.
Description
Technical field
The present invention relates to household electrical appliance technical field, the control device and a kind of air of more particularly to a kind of ion generator
Depurator and a kind of control method of ion generator.
Background technology
Related air purifier such as no material consumption air purifier is typically with plasma cleaning technology, and its work is former
Manage and be, by loading superelevation DC voltage to ion generator so that flow through the air ionization in ion generator, and then cause
Impurity in air is powered, the collecting plate adsorbing contaminant of opposite voltage is then passed through, so as to clean air.It is former based on above-mentioned work
Reason, can be abstract for capacity load ion generator, and wherein high-pressure side is capacitance pole, and leaked-in air is electrolyte.
But, the problem that correlation technique is present is, in the case where electrode structure is constant, the temperature of air, relative humidity,
The factors such as air pressure, impurity content and air velocity can all cause the change of capacitor leakage current, it is thereby possible to ion can be caused to occur
There is fluctuation in the power of device, in addition in extreme circumstances it is possible that puncture, the phenomenon such as arcing, it is easy to damage ion generation
Device so that air purification efficiency decreases, and it is also possible to jeopardize the safety of user.
The content of the invention
Related air purifier realizes that Feedback of Power is adjusted by the current power of real-time detection ion generator, makes
The power for obtaining ion generator keeps stable.But, it is found by the applicant that and recognizing, outside in the applied environment of air purifier
Interference is more, and external disturbance influences whether the accuracy of power detection, causes power detection inaccurate, thus, even if using work(
Rate feedback adjustment can still make the power of ion generator larger fluctuation occur, cause ion generator to damage, purification of air effect
Rate is reduced.
For this purpose, it is contemplated that at least solving one of technical problem in correlation technique to a certain extent.The present invention's
First purpose is to propose a kind of control device of ion generator, is capable of the power of accurate acquisition ion generator, effectively
Prevent ion generator caused by power swing from damaging.
Second object of the present invention is to propose a kind of air purifier, and third object of the present invention is proposition one
Plant the control method of ion generator.
To reach above-mentioned purpose, first aspect present invention embodiment proposes a kind of control device of ion generator, bag
Include：Switching Power Supply, the Switching Power Supply is connected with alternating current power supply, and the Switching Power Supply is used to for alternating current to be converted to unidirectional current；
Boosting unit, the boosting unit is connected with the Switching Power Supply and the ion generator, and the boosting unit is used for institute
State unidirectional current to be boosted, think that the ion generator is powered；Current acquisition unit, the current acquisition unit is connected to institute
State between Switching Power Supply and the boosting unit, the current acquisition unit is worked as gathering the filtered of the Switching Power Supply
Front output current；And control unit, described control unit is connected with the boosting unit and the current acquisition unit, described
Control unit is filtered according to default Kalman filtering algorithm to the current output current of the Switching Power Supply, and according to filter
Current output current after ripple calculates the power of the ion generator, and according to the power of the ion generator to the liter
Pressure unit is controlled.
The control device of the ion generator for proposing according to embodiments of the present invention, by current acquisition unit collection switch electricity
The current output current in source, control unit is carried out according to default Kalman filtering algorithm to the current output current of Switching Power Supply
Filtering, and the power of ion generator is calculated according to filtered current output current, and according to the power pair of ion generator
Boosting unit is controlled, you can ion generator is controlled such that it is able to effectively filter external interference, improves power and adopts
The precision and stability of collection, effectively prevents ion generator caused by power swing from damaging.
In addition, the control device of the ion generator proposed according to the above embodiment of the present invention can also have following adding
Technical characteristic：
According to one embodiment of present invention, according to default Kalman filtering algorithm to the current of the Switching Power Supply
When output current is filtered, described control unit is used to obtain a filtered output current, and according to described upper one
Individual filtered output current calculates current predictive electric current, and according to the current predictive electric current and the current output current
Obtain the filtered current output current.
According to one embodiment of present invention, the current acquisition unit includes：First resistor, the first resistor connection
Between the Switching Power Supply and the filter unit；Amplifying circuit, the input amplifier and the first resistor
Two ends are connected, and the outfan of the amplifying circuit is connected with described control unit.
According to one embodiment of present invention, the boosting unit includes：At the beginning of booster transformer, the booster transformer
One end of level coil is connected with the filter unit；Metal-oxide-semiconductor, the primary line of the drain electrode of the metal-oxide-semiconductor and the booster transformer
The other end of circle is connected, and the source ground of the metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor is connected with described control unit；Voltage multiplying rectifier
Module, the input of the voltage doubling rectifier module is connected with the two ends of the secondary coil of the booster transformer, described times of repoussage
The outfan of flow module is connected with the ion generator.
To reach above-mentioned purpose, second aspect present invention embodiment proposes a kind of air purifier, described including described
The control device of ion generator.
The air purifier for proposing according to embodiments of the present invention, the control device that can pass through ion generator effectively filters outer
Boundary disturbs, and improves the precision and stability of power collecting, effectively prevents ion generator caused by power swing from damaging.
To reach above-mentioned purpose, third aspect present invention embodiment proposes a kind of control method of ion generator, from
The control device of electronic generator includes Switching Power Supply, boosting unit, and the Switching Power Supply is used to for alternating current to be converted to unidirectional current,
The boosting unit thinks that the ion generator is powered for carrying out boosting to the unidirectional current, and methods described includes following step
Suddenly：Gather the output current of the Switching Power Supply；According to default Kalman filtering algorithm to the current defeated of the Switching Power Supply
Go out electric current；And the power of the ion generator is calculated according to filtered current output current, and sent out according to the ion
The power of raw device is controlled to the boosting unit.
The control method of the ion generator for proposing according to embodiments of the present invention, gathers first the output electricity of Switching Power Supply
Stream, the current output current of Switching Power Supply is filtered then according to default Kalman filtering algorithm, and according to filtering after
Current output current calculate the power of ion generator, and boosting unit is controlled according to the power of ion generator,
Ion generator can be controlled such that it is able to effectively filter external interference, improve the precision and stability of power collecting,
Effectively prevent ion generator caused by power swing from damaging.
According to one embodiment of present invention, it is described the Switching Power Supply is worked as according to default Kalman filtering algorithm
Front output current be filtered including：Obtain a filtered output current；According to a upper filtered output
Current calculation current predictive electric current；Described filtered work as, is obtained according to the current predictive electric current and the current output current
Front output current.
Description of the drawings
Fig. 1 is the block diagram of the control device of ion generator according to embodiments of the present invention；
Fig. 2 is the circuit theory diagrams of the control device of ion generator according to an embodiment of the invention；
Fig. 3 is the output current of the control device breaker in middle power supply of ion generator according to an embodiment of the invention
Waveform diagram；
Fig. 4 is the block diagram of air purifier according to embodiments of the present invention；
Fig. 5 is the flow chart of the control method of ion generator according to embodiments of the present invention；And
Fig. 6 is the flow chart of the control method of ion generator according to an embodiment of the invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
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 be not considered as limiting the invention.
Below with reference to the accompanying drawings come describe in detail the embodiment of the present invention proposition air purifier, ion generator control dress
Put, method.
Fig. 1 is the block diagram of the control device of ion generator according to embodiments of the present invention.As shown in figure 1, should
The control device 100 of ion generator includes：Switching Power Supply 10, boosting unit 30, current acquisition unit 50 and control unit 60.
Wherein, Switching Power Supply 10 is connected with alternating current power supply 70, and Switching Power Supply 10 is used to for alternating current to be converted to unidirectional current；Rise
Pressure unit 30 is connected with Switching Power Supply 10 and ion generator 40, boosting unit 30 for boosting to unidirectional current, think from
Electronic generator 40 is powered；Current acquisition unit 50 is connected between Switching Power Supply 10 and boosting unit 30, current acquisition unit 50
For gathering the output current of Switching Power Supply 10；Control unit 60 is connected with boosting unit 30 and current acquisition unit 50, control
Unit 60 is filtered according to default Kalman filtering algorithm to the current output current of Switching Power Supply 10, and according to filtering after
Current output current calculate the power of ion generator 40, and boosting unit 30 is carried out according to the power of ion generator 40
Control.
That is, the switch that control unit 60 is gathered according to default Kalman filtering algorithm to current acquisition unit 50
The current output current of power supply 10 is filtered, and calculates ion generator according to the output current of filtered Switching Power Supply 10
40 power, and boosting unit 30 is controlled according to the power of the ion generator 40 for calculating.
Thus, in embodiments of the present invention, by the current output current to Kalman filtering algorithm to Switching Power Supply 10
It is filtered, effectively filters out the external disturbance in electric current, obtain true, accurate electric current, and then obtains accurate ion generation
The power of device 40, realizes more accurate Feedback of Power control so that the power kept stable of ion generator 40, effectively
Prevent ion generator caused by power swing from damaging.
According to one embodiment of present invention, in the current output according to default Kalman filtering algorithm to Switching Power Supply
When electric current is filtered, control unit 60 is used to obtain a filtered output current, and filtered according to upper one
Output current calculates current predictive electric current, and obtains filtered current defeated according to current predictive electric current and current output current
Go out electric current.
Specifically, first introduce a Discrete Linear stochastic differential equation to describe the control of Ion Current control system
Process processed, its relational expression is：X (k)=AX (k-1)+BU (k)+W (k), wherein, X (k) is the system mode at k moment, X (k-1)
It is the system mode at k-1 moment, U (k) is controlled quentity controlled variable of the k moment to Ion Current control system, and A and B is system ginseng
Number, W (k) represents process noise.
Additionally, current measurement value Z (k) at k moment is with the relation of current status X (k) at k moment：Z (k)=HX (k)+V
(k), wherein, H is the parameter of measuring system, and V (k) represents measurement noise, and assumes that W (k) and V (k) is Gauss white noise respectively
Sound, then covariance can be respectively Q, R, for simplified operation, it is assumed that they do not change with system state change.
Thus, the process model of Ion Current control system is set up and is finished.
The process being filtered to the output current of Switching Power Supply 10 based on Kalman filtering algorithm is described below in detail：
First, the system mode at current time is predicted using process model X (k)=AX (k-1)+BU (the k)+W (k) of system
That is current predictive electric current.Hypothesis current time is k, according to the process model of system, can be based on the system mode at a upper moment
Predict the system mode at current time：
X (k | k-1)=AX (k-1 | k-1)+BU (k),
Wherein, X (k | k-1) is the predicted current i.e. current predictive electric current at k moment, X (k-1 | k-1) be the k-1 moment most
Excellent electric current estimated value, that is, go up a filtered output current, and U (k) is the controlled quentity controlled variable at k moment.
(k | k) is the current value that k moment Kalman filtering is calculated, the as optimal current at k moment it should be appreciated that X
Estimated value, X (k-1 | k-1) is the current value that k-1 moment Kalman filtering is calculated, as the optimal current estimated value at k-1 moment,
X (k-2 | k-2) is the current value that k-2 moment Kalman filtering is calculated, as the optimal current estimated value at k-2 moment, then pass through
In front and back 3 current values and increment type PID algorithm calculate the Duty ratio control amount for maintaining target current setting value, this controlled quentity controlled variable
It is exactly U (k), because the dutycycle of target current setting value is fixed, so, without controlled quentity controlled variable, U (k) can be equal to 0.
Also, also the predicted current X at k moment (k | k-1) corresponding covariance can be updated according to below equation：
P (k | k-1)=AP (k-1 | k-1) A '+Q,
Wherein, P (k | k-1) is predicted current X (k | k-1) the corresponding covariance at k moment, when P (k-1 | k-1) is k-1
Filtered output current X (k-1 | k-1) the corresponding covariance carved, A ' represents the transposed matrix of A, and Q is systematic procedure noise W
K () corresponding covariance, can be fixed value.
The predicted current at k moment is got in filtered output current X (k-1 | k-1) according to the k-1 moment to obtain
After current predictive electric current, the current output current of the Switching Power Supply 10 of the collection of current acquisition unit 50 can be obtained, with reference to current pre-
Electric current and current output current are surveyed, the i.e. filtered current output current of optimal current estimated value at current time can be obtained,
Formula is as follows：
X (k | k)=X (k | k-1)+Kg (k) (Z (k)-HX (k | k-1)),
Wherein, X (k | k) is filtered current output current for the optimal current estimated value at k moment, and X (k | k-1) it is k
The predicted current at moment is current predictive electric current, and Z (k) is the current output current that the unfiltered electric current at k moment is collected,
Kg (k) is Kalman gain.
Wherein, Kalman gain Kg (k) can be obtained according to below equation：
Kg (k)=P (k | k-1) H '/(HP (k | k-1) H '+R)
Wherein, P (k | k-1) is predicted current X (k | k-1) the corresponding covariance at k moment, and H ' represents the transposed matrix of H,
R is the corresponding covariance of measurement noise V (k), can be fixed value.
Also, the optimal current estimated value X at k moment (k | k) corresponding covariance is updated always according to below equation,
So as to Kalman filtering is constantly performed down until process terminates：
P (k | k)=(I-Kg (k) H) P (k | k-1),
Wherein, I is 1 matrix, for the measurement of single model list, I=1.When system enters the k=1 moment, P (k | k) can make
For P (k-1 | k-1).So, Kalman filtering algorithm just can be gone down with autoregressive computing.
Thus, first according to the filtered optimal current at k-1 moment acquisition k moment current predictive electric currents, further according to the k moment
Unfiltered measurement electric current and k moment current predictives electric current obtain the filtered maximum likelihood estimation electric current at k moment, according to this class
Push away, k+1, k+2 ... k+N filtered maximum likelihood estimation electric current can be obtained.Say, current acquisition unit 50 is to each moment
Output current is acquired, and the output currents of the collection of control unit 60 pairs are filtered, and filtered according to each moment
Output current calculates the power of ion generator 40, so as to effectively filter external interference, improves the precision of power collecting and stablizes
Property.
In embodiments of the present invention, as shown in Figure 1-2, alternating current power supply 70 is changed into DC source by Switching Power Supply 10, and
And current acquisition unit 50 gathers the output DC current of filtered Switching Power Supply 10, and by filtered DC supply input liter
Pressure unit 30, so that boosting unit 30 boosts to filtered unidirectional current；Control unit 60 is according to current acquisition unit 50
The filtered DC current of collection calculates the power of ion generator 40, and is generated according to the power of ion generator 40
Pwm signal to be input into boosting unit 30, and then control unit 60 according to the power of ion generator 40 to boosting unit 30
Output voltage is controlled, and is controlled with the working condition to ion generator 40.Thus, gathered according to current acquisition unit
Electric current in real time, power that is stable, obtaining ion generator exactly, effectively filter external interference, effectively prevent power waves
Ion generator is damaged caused by dynamic.
According to one embodiment of present invention, as shown in Fig. 2 boosting unit 30 includes：Booster transformer 90, metal-oxide-semiconductor Q1
With voltage doubling rectifier module 101.Wherein, one end of the primary coil of booster transformer 90 is connected with current acquisition unit 50；Metal-oxide-semiconductor
Drain electrode be connected with the other end of the primary coil of booster transformer 90, the source ground of metal-oxide-semiconductor, the grid of metal-oxide-semiconductor and control
Unit 60 is connected；The input of voltage doubling rectifier module 101 is connected with the two ends of the secondary coil of booster transformer 90, voltage multiplying rectifier
The outfan of module 101 is connected with ion generator 40.
Specifically, alternating current power supply 70 becomes low tension Jing after the conversion of Switching Power Supply 10, and the outfan of Switching Power Supply 10 connects
The primary coil of booster transformer 90 is connected to so that low-voltage DC is provided to primary coil, the primary coil of booster transformer 90
Connect with metal-oxide-semiconductor Q1.Control unit 60 to metal-oxide-semiconductor Q1 sends pwm signal to drive metal-oxide-semiconductor Q1 to turn on and off rapidly, thus,
Alternating voltage is produced on the primary coil of booster transformer 90, at this moment the secondary coil of booster transformer 90 induces pulsation height
Piezoelectricity, the secondary coil connection voltage doubling rectifier module 101 of booster transformer 90, by pulsation high-tension electricity voltage multiplying rectifier mould is supplied to
Block 101, finally exports high-tension electricity by voltage doubling rectifier module 101, i.e., ion generator 40 is powered.
The voltage swing of the high-tension electricity of the output of voltage doubling rectifier module 40 output voltage, liter buckling mainly with Switching Power Supply 10
The transformation ratio of depressor 90, the dutycycle of pwm signal, the relating to parameters of voltage doubling rectifier module 101.After hardware circuit determines, supply
The size and ion generator power of piezoelectric voltage is relevant with the dutycycle of pwm signal, and dutycycle is higher, and the voltage of high-tension electricity is got over
Greatly, the power of corresponding ion generator also can be higher.Based on this, the control unit 60 of the embodiment of the present invention passes through default card
Kalman Filtering algorithm is filtered to the output current of Switching Power Supply 10, effectively filters out the external disturbance in electric current, obtain it is true,
Accurate electric current, and then accurate Feedback of Power adjustment is realized, effectively suppress power swing, prevent ion generator from damaging.
According to one embodiment of present invention, as shown in Fig. 2 current acquisition unit 50 includes：First resistor R1 and amplification
Circuit 80, wherein, first resistor R1 is connected between Switching Power Supply 10 and filter unit 20；The input of amplifying circuit 80 and
The two ends of one resistance R1 are connected, and the outfan of amplifying circuit 20 is connected with control unit 60.
Wherein, first resistor R1 can be noninductive resistance.
Specifically, amplifying circuit 80 can be amplified by differential mode to the small pressure reduction at first resistor R1 two ends,
So as to control unit 60 obtains the electric current for flowing through first resistor R1 according to the voltage that amplifying circuit 80 is exported, I is designated as, you can with logical
Crossing first resistor R1 carries out current sample, it is assumed that the output voltage of Switching Power Supply 10 is V, then the realtime power of ion generator 40
Can be P=I*V, and then control unit 60 can calculate the reality of ion generator 40 according to the current value for flowing through first resistor R1
When power, and the output voltage of boosting unit 30 is controlled according to the realtime power of ion generator 40.Of the invention real
In applying example, first resistor R1 of current acquisition unit 50 is connected with the primary coil of booster transformer 90, due to booster transformer
90 primary coil resistance is very little, and generally less than 5 Ω, therefore metal-oxide-semiconductor Q1 open moment can produce very high forward current point
Peak, the moment of metal-oxide-semiconductor Q1 shut-offs, the primary coil of booster transformer 90 can induce very high reverse current spike.
The embodiment of the present invention can be filtered process by Kalman filtering algorithm to the output current of Switching Power Supply 10, can
So that the very high current spike that the moment that metal-oxide-semiconductor Q1 is turned on and off produces becomes gentle, that is to say, that metal-oxide-semiconductor Q1 is open-minded
Filtered with the interference produced by shut-off, inhibited on the sample waveform of first resistor R1 in current acquisition unit 50 extraneous dry
Disturb, the filter curve that has in such as Fig. 3 is filtered current waveform schematic diagram so that the electric current of collection is truer so that meter
The power for calculating is also more accurate.
And filtering free circuit relaxes rush of current in correlation technique, the interference opened produced by shut-off of MOS can be superimposed upon
On first resistor R1 sample waveform, or even the sample waveform for covering first resistor R1 so that control unit 60 cannot get very
Real current value, in such as Fig. 3 is unfiltered current waveform schematic diagram without filter curve.
From have filter curve in such as Fig. 3 and contrast without filter curve knowable to, the embodiment of the present invention passes through Kalman filtering
After algorithm is to the filtering of the output current of Switching Power Supply 10, can effectively filter extraneous random disturbances, can accurate acquisition to current value.
In sum, the control device of the ion generator for proposing according to embodiments of the present invention, by current acquisition unit
The filtered current output current of collection Switching Power Supply, control unit is according to default Kalman filtering algorithm to Switching Power Supply
Current output current be filtered, and the power of ion generator is calculated according to filtered current output current, and according to
The power of ion generator is controlled to boosting unit, you can the electric power thus supplied of ion generator is controlled, so as to
It is enough effectively to filter external interference, the precision and stability of power collecting is improved, effectively prevent ion caused by power swing from occurring
Device is damaged.
Fig. 4 is the block diagram of air purifier according to embodiments of the present invention.As shown in figure 4, the air purifier
200 control devices 100 for including ion generator.
In sum, the air purifier for proposing according to embodiments of the present invention, can be by the control device of ion generator
External interference is effectively filtered, the precision and stability of power collecting is improved, ion generator caused by power swing is effectively prevented
Damage.
Fig. 5 is the flow chart of the control method of ion generator according to embodiments of the present invention.Wherein, ion generator
Control device includes Switching Power Supply, boosting unit, and Switching Power Supply is used to for alternating current to be converted to unidirectional current, and it is right that boosting unit is used for
Unidirectional current carries out boosting and thinks that ion generator is powered, as shown in figure 5, the control method of the ion generator includes following step
Suddenly：
S101：The output current of collection Switching Power Supply.
S102：The current output current of Switching Power Supply is filtered according to default Kalman filtering algorithm.
S103：The power of ion generator is calculated according to filtered current output current, and according to ion generator
Power is controlled to boosting unit.
That is, the switch electricity that air purifier is gathered according to default Kalman filtering algorithm to current acquisition unit
The current output current in source is filtered, and calculates the work(of ion generator according to the output current of filtered Switching Power Supply
Rate, and boosting unit is controlled according to the power of the ion generator for calculating.
Thus, in embodiments of the present invention, by entering to the current output current of Switching Power Supply to Kalman filtering algorithm
Row filtering, effectively filters out the external disturbance in electric current, obtains true, accurate electric current, and then obtains accurate ion generator
Power so that the power kept stable of ion generator, effectively prevent caused by power swing ion generator to damage.
According to still another embodiment of the invention, as shown in fig. 6, step S102 includes：
S201：Obtain a filtered output current.
S202：Current predictive electric current is calculated according to upper one filtered output current.
S203：Filtered current output current is obtained according to current predictive electric current and current output current.
Specifically, first introduce a Discrete Linear stochastic differential equation to describe the control of Ion Current control system
Process processed, its relational expression is：X (k)=AX (k-1)+BU (k)+W (k), wherein, X (k) is the system mode at k moment, X (k-1)
It is the system mode at k-1 moment, U (k) is controlled quentity controlled variable of the k moment to Ion Current control system, and A and B is system ginseng
Number, W (k) represents process noise.
Additionally, current measurement value Z (k) at k moment is with the relation of current status X (k) at k moment：Z (k)=HX (k)+V
(k), wherein, H is the parameter of measuring system, and V (k) represents measurement noise, and assumes that W (k) and V (k) is Gauss white noise respectively
Sound, then covariance can be respectively Q, R, for simplified operation, it is assumed that they do not change with system state change.
Thus, the process model of Ion Current control system is set up and is finished.
The process being filtered to the output current of Switching Power Supply based on Kalman filtering algorithm is described below in detail：
First, the system mode at current time is predicted using process model X (k)=AX (k-1)+BU (the k)+W (k) of system
That is current predictive electric current.Hypothesis current time is k, according to the process model of system, can be based on the system mode at a upper moment
Predict the system mode at current time：
X (k | k-1)=AX (k-1 | k-1)+BU (k),
Wherein, X (k | k-1) is the predicted current i.e. current predictive electric current at k moment, X (k-1 | k-1) be the k-1 moment most
Excellent electric current estimated value, that is, go up a filtered output current, and U (k) is the controlled quentity controlled variable at k moment.
(k | k) is the current value that k moment Kalman filtering is calculated, the as optimal current at k moment it should be appreciated that X
Estimated value, X (k-1 | k-1) is the current value that k-1 moment Kalman filtering is calculated, as the optimal current estimated value at k-1 moment,
X (k-2 | k-2) is the current value that k-2 moment Kalman filtering is calculated, as the optimal current estimated value at k-2 moment, then pass through
In front and back 3 current values and increment type PID algorithm calculate the Duty ratio control amount for maintaining target current setting value, this controlled quentity controlled variable
It is exactly U (k), because the dutycycle of target current setting value is fixed, so, without controlled quentity controlled variable, U (k) can be equal to 0.
Also, also the predicted current X at k moment (k | k-1) corresponding covariance can be updated according to below equation：
P (k | k-1)=AP (k-1 | k-1) A '+Q,
Wherein, P (k | k-1) is predicted current X (k | k-1) the corresponding covariance at k moment, when P (k-1 | k-1) is k-1
Filtered output current X (k-1 | k-1) the corresponding covariance carved, A ' represents the transposed matrix of A, and Q is systematic procedure noise W
K () corresponding covariance, can be fixed value.
The predicted current at k moment is got in filtered output current X (k-1 | k-1) according to the k-1 moment to obtain
After current predictive electric current, the current output current of the Switching Power Supply of current acquisition unit collection can be obtained, with reference to current predictive electricity
Stream and current output current, can obtain the i.e. filtered current output current of optimal current estimated value at current time, formula
It is as follows：
X (k | k)=X (k | k-1)+Kg (k) (Z (k)-HX (k | k-1)),
Wherein, X (k | k) is filtered current output current for the optimal current estimated value at k moment, and X (k | k-1) it is k
The predicted current at moment is current predictive electric current, and Z (k) is the current output current that the unfiltered electric current at k moment is collected,
Kg (k) is Kalman gain.
Wherein, Kalman gain Kg (k) can be obtained according to below equation：
Kg (k)=P (k | k-1) H '/(HP (k | k-1) H '+R),
Wherein, P (k | k-1) is predicted current X (k | k-1) the corresponding covariance at k moment, and H ' represents the transposed matrix of H,
R is the corresponding covariance of measurement noise V (k), can be fixed value.
Also, the optimal current estimated value X at k moment (k | k) corresponding covariance is updated always according to below equation,
So as to Kalman filtering is constantly performed down until process terminates：
P (k | k)=(I-Kg (k) H) P (k | k-1),
Wherein, I is 1 matrix, for the measurement of single model list, I=1.When system enters the k=1 moment, P (k | k) can make
For P (k-1 | k-1).So, Kalman filtering algorithm just can be gone down with autoregressive computing.
Thus, first according to the filtered optimal current at k-1 moment acquisition k moment current predictive electric currents, further according to the k moment
Unfiltered measurement electric current and k moment current predictives electric current obtain the filtered maximum likelihood estimation electric current at k moment, according to this class
Push away, k+1, k+2 ... k+N filtered maximum likelihood estimation electric current can be obtained.Say, current acquisition unit is defeated to each moment
Go out electric current to be acquired, control unit is filtered the output current for gathering, and according to the filtered output at each moment
The power of Current calculation ion generator, so as to effectively filter external interference, improves the precision and stability of power collecting.
In embodiments of the present invention, as shown in Figure 1-2, alternating current power supply is changed into DC source, and electricity by Switching Power Supply
Stream collecting unit gathers the output DC current of filtered Switching Power Supply, and by filtered DC supply input boosting unit,
So that boosting unit boosts to filtered unidirectional current；Air purifier according to current acquisition unit gather it is filtered
DC current calculates the power of ion generator, and generates pwm signal to be input into boosting according to the power of ion generator
Unit, and then air purifier is controlled according to the power of ion generator to the output voltage of boosting unit, with to ion
The working condition of generator is controlled.Thus, obtained in real time, stably, exactly according to the electric current of current acquisition unit collection
The power of ion generator, effectively filters external interference, effectively prevents ion generator caused by power swing from damaging.
In sum, the control method of the ion generator for proposing according to embodiments of the present invention, first by current acquisition
Unit gathers the output current of Switching Power Supply, then according to current output electricity of the default Kalman filtering algorithm to Switching Power Supply
Stream is filtered, and calculates the power of ion generator according to filtered current output current, and according to ion generator
Power is controlled to boosting unit, you can ion generator is controlled such that it is able to effectively filter external interference, improves
The precision and stability of power collecting, effectively prevents ion generator caused by power swing from damaging.
In describing the invention, it is to be understood that term " " center ", " longitudinal direction ", " horizontal ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicates or imply that the device or element of indication must
With specific orientation, with specific azimuth configuration and operation, therefore must be not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or it is integral；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clearly restriction.For one of ordinary skill in the art
For, can as the case may be understand above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be with
It is the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (7)
1. a kind of control device of ion generator, it is characterised in that include：
Switching Power Supply, the Switching Power Supply is connected with alternating current power supply, and the Switching Power Supply is used to for alternating current to be converted to unidirectional current；
Boosting unit, the boosting unit is connected with the Switching Power Supply and the ion generator, and the boosting unit is used for
The unidirectional current is boosted, thinks that the ion generator is powered；
Current acquisition unit, the current acquisition unit is connected between the Switching Power Supply and the boosting unit, the electricity
Stream collecting unit is used to gather the filtered current output current of the Switching Power Supply；And
Control unit, described control unit is connected with the boosting unit and the current acquisition unit, described control unit root
The current output current of the Switching Power Supply is filtered according to default Kalman filtering algorithm, and according to filtered current
Output current calculates the power of the ion generator, and the boosting unit is carried out according to the power of the ion generator
Control.
2. the control device of ion generator according to claim 1, it is characterised in that filtered according to default Kalman
When ripple algorithm is filtered to the current output current of the Switching Power Supply, described control unit is used to obtain after a filtering
Output current, and current predictive electric current is calculated according to a upper filtered output current, and according to described current
Predicted current and the current output current obtain the filtered current output current.
3. the control device of ion generator according to claim 1, it is characterised in that the current acquisition unit bag
Include：
First resistor, the first resistor is connected between the Switching Power Supply and the filter unit；
Amplifying circuit, the input amplifier is connected with the two ends of the first resistor, the outfan of the amplifying circuit
It is connected with described control unit.
4. the control device of ion generator according to claim 1, it is characterised in that the boosting unit includes：
Booster transformer, one end of the primary coil of the booster transformer is connected with the filter unit；
Metal-oxide-semiconductor, the drain electrode of the metal-oxide-semiconductor is connected with the other end of the primary coil of the booster transformer, the source of the metal-oxide-semiconductor
Pole is grounded, and the grid of the metal-oxide-semiconductor is connected with described control unit；
Voltage doubling rectifier module, the two ends phase of the input of the voltage doubling rectifier module and the secondary coil of the booster transformer
Even, the outfan of the voltage doubling rectifier module is connected with the ion generator.
5. a kind of air purifier, it is characterised in that include ion generator according to any one of claim 1-4
Control device.
6. a kind of control method of ion generator, it is characterised in that the control device of ion generator includes Switching Power Supply, rises
Pressure unit, the Switching Power Supply is used to for alternating current to be converted to unidirectional current, and the boosting unit is used to carry out the unidirectional current
Boosting thinks that the ion generator is powered, and the method comprising the steps of：
Gather the output current of the Switching Power Supply；
The current output current of the Switching Power Supply is filtered according to default Kalman filtering algorithm；And
The power of the ion generator is calculated according to filtered current output current, and according to the work(of the ion generator
Rate is controlled to the boosting unit.
7. the control method of ion generator according to claim 6, it is characterised in that described according to default Kalman
Filtering algorithm the current output current of the Switching Power Supply is filtered including：
Obtain a filtered output current；
Current predictive electric current is calculated according to a upper filtered output current；
The filtered current output current is obtained according to the current predictive electric current and the current output current.
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| CN201611255806.0A CN106602903A (en) | 2016-12-30 | 2016-12-30 | Air purifier and control device and method of ion generator |
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| CN201611255806.0A CN106602903A (en) | 2016-12-30 | 2016-12-30 | Air purifier and control device and method of ion generator |
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