CN105429494B - A kind of inverter power supply device and its control method - Google Patents
A kind of inverter power supply device and its control method Download PDFInfo
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- CN105429494B CN105429494B CN201511033888.XA CN201511033888A CN105429494B CN 105429494 B CN105429494 B CN 105429494B CN 201511033888 A CN201511033888 A CN 201511033888A CN 105429494 B CN105429494 B CN 105429494B
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The embodiment of the invention discloses a kind of inverter power supply device and its control method, described device includes：DC source, inverter circuit, inductance, voltage sensor, current sensor, voltage and current sampling unit and modulation control unit；Wherein, the DC source is connected with the inverter circuit；The output terminal of the inverter circuit is connected by the inductance with load；The output terminal of the modulation control unit is connected with the input terminal of the inverter circuit, voltage signal and current signal for being exported according to the voltage and current sampling unit generate pulse-width modulation PWM driving control signal, to control switching tube turn-on and turn-off in the inverter circuit.Technical solution provided in an embodiment of the present invention, makes inverter work in discontinuous conduction mode, and the Sofe Switch of device for power switching in inverter circuit is realized in the case of without extra resonance circuit, greatly reduces switching loss.
Description
Technical field
The present embodiments relate to inverter technical field more particularly to a kind of inverter power supply device and its controlling parties
Method.
Background technology
High efficiency, high power density are the important directions of inverter development.For the inverter of certain power grade
Device, power density depend on the volume of device, essentially consist in the volume of magnetic element and radiator.Radiator is in order to fast
Speed effectively disperses the amount of heat generated during inverter work, avoids damaging equipment.Therefore, volume depends primarily on inverse
Loss size when variable power source works.If the loss of inverter can be reduced, the efficiency of inverter can not only be improved, moreover it is possible to
The volume of radiator is effectively reduced, so as to improve power density.
Loss in inverter mainly includes switching tube loss and magnetic element loss.Wherein, the damage of power switch pipe
Consumption includes on-state loss and switching loss.Wherein, on-state loss is determined by the conduction voltage drop of switching tube with the electric current flowed through, usually
It can not change.And switching loss be by switching device during turning on and off voltage and electric current it is overlapping caused by.Due to
The switching tube of inverter can be completed once to turn on and off in each switch periods, therefore, when inverter is improves performance
And the loss of switching device will necessarily significantly be increased by increasing switching frequency, so as to considerably increase the volume of radiating element and again
Amount, it is therefore necessary to which taking appropriate measures reduces the loss of inverter.
The effective way for reducing switching loss is exactly to be reduced as far as the overlapping time of switching device voltage and electric current, and
This is realized often by soft switch technique, i.e., after electric current is zero, making switching device shutdown, (or voltage makes out when being zero
It is open-minded to close device).In small-power inverter, soft switch technique is mainly realized by extra resonance circuit.According to its work
Resonant de link, resonant pole, auxiliary resonance buffering, major-minor switching circuit, carrier Control etc. can be divided by making principle and circuit position.
Using resonance circuit come when realizing Sofe Switch, resonant process can generate very high voltage stress on switching device should with electric current
Power.Therefore, the soft switch technique based on resonance circuit is suitable only for small-power field.In addition, resonance circuit need to add in it is auxiliary
The elements such as capacitance, inductance and switching tube are helped, this causes the control strategy of inverter to become extremely complex, influences inverter
Stable operation.
Invention content
The embodiment of the present invention provides a kind of inverter power supply device and its control method, to realize that the pipe that opens the light in inverter circuit is soft
Switch, reduces the loss of switching tube.
In a first aspect, an embodiment of the present invention provides a kind of inverter power supply device, including：
DC source, inverter circuit, inductance, voltage sensor, current sensor, voltage and current sampling unit and modulation
Control unit；Wherein,
The DC source is connected with the inverter circuit；
The output terminal of the inverter circuit is connected by the inductance with load；
The input terminal of the voltage and current sampling unit passes through the voltage sensor and current sensor and the inversion
The output terminal of circuit is connected, for collection voltages signal and current signal；
The output terminal of the voltage and current sampling unit is connected with the input terminal of the modulation control unit, for that will acquire
To voltage signal and current signal export to the modulation control unit；
The output terminal of the modulation control unit is connected with the input terminal of the inverter circuit, for according to voltage electricity
The voltage signal of sampling unit output and current signal generation pulse-width modulation PWM driving control signal are flowed, to control the inversion
Switching tube turn-on and turn-off in circuit.
Second aspect, an embodiment of the present invention provides a kind of control method of inverter power supply device, by first aspect
Inverter power supply device performs, including：
The control terminal output pulse width modulation (PWM) driving control signal of switching tube into the inverter circuit；
The voltage signal and current signal exported according to the voltage and current sampling unit controls the PWM drive controls letter
Number.
Technical solution provided in an embodiment of the present invention makes inverter work in discontinuous conduction mode using inductance,
The current signal exported in the case of without extra resonance circuit according to voltage and current sampling unit is realized using control strategy
The Sofe Switch of device for power switching, greatly reduces switching loss in inverter circuit, so as to substantially reduce the body of radiator
Product and weight are effectively improved the power density of inverter.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
Have technology describe needed in attached drawing do one and simply introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments, for those of ordinary skill in the art, without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of structure diagram for inverter power supply device that the embodiment of the present invention one provides；
Fig. 2 is inductive current oscillogram in a switch periods of the offer of the embodiment of the present invention one；
Fig. 3 is a kind of structure diagram of the modulation control unit of inverter power supply device provided by Embodiment 2 of the present invention；
Fig. 4 is a kind of inductive current oscillogram of inverter power supply device provided by Embodiment 2 of the present invention；
Fig. 5 is that a kind of control structure of the voltage control subelement for inverter power supply device that the embodiment of the present invention three provides is shown
It is intended to；
Fig. 6 is a kind of flow diagram of the control method for inverter power supply device that the embodiment of the present invention four provides；
Fig. 7 is a kind of inverter power supply device topological structure schematic diagram that the embodiment of the present invention five provides；
Output voltage, output current and electricity when Fig. 8 is a kind of inverter power supply device zero load that the embodiment of the present invention five provides
Inducing current oscillogram；
Output voltage, output electricity when Fig. 9 is a kind of inverter power supply device band resistive load that the embodiment of the present invention five provides
Stream and inductive current oscillogram；
Output voltage, output when Figure 10 is a kind of inverter power supply device band nonlinear load that the embodiment of the present invention five provides
Electric current and inductive current oscillogram；
Figure 11 is a kind of inverter power supply device inductive current oscillogram that the embodiment of the present invention five provides.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, hereinafter with reference to attached in the embodiment of the present invention
Figure, technical scheme of the present invention is clearly and completely described by embodiment, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Go out all other embodiments obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Embodiment one
Fig. 1 is a kind of structure diagram for inverter power supply device that the embodiment of the present invention one provides, referring to Fig. 1, the dress
Put including：DC source 11, inverter circuit 12, inductance L, voltage sensor 13, current sensor 14, voltage and current sampling unit
15 and modulation control unit 16；Wherein,
The DC source 11 is connected with the inverter circuit 12；
The output terminal of the inverter circuit 12 is connected by the inductance L with load；
The input terminal of the voltage and current sampling unit 15 passes through the voltage sensor 13 and current sensor 14 and institute
The output terminal for stating inverter circuit 12 is connected, for collection voltages and current signal；
The output terminal of the voltage and current sampling unit 15 is connected with the input terminal of the modulation control unit 16, for inciting somebody to action
Collected voltage and current signal is exported to the modulation control unit 16；
The output terminal of the modulation control unit 16 is connected with the input terminal of the inverter circuit 12, for according to the electricity
Voltage signal and current signal the generation pulse-width modulation PWM driving control signal that current voltage sampling unit 15 exports, to control
State switching tube turn-on and turn-off in inverter circuit 12.
The output of inverter circuit output terminal is high voltage and high current signal, cannot generally be sent directly into voltage and current sampling
High voltage can be converted to the small voltage signal that voltage and current sampling unit can receive by voltage sensor, led to by unit
High current is converted to the low current signal that voltage and current sampling unit can receive by over-current sensor, is sampled through voltage and current
Unit acquisition and output voltage and current signal.
Wherein, a reference value R of inductance L induction reactanceBIt is defined as
The perunit value X of inductance L induction reactanceL *It is defined as
In the present embodiment, the induction reactance perunit value X of the inductance L used in inverter power supply deviceL *Meet：
Wherein：XLInduction reactance value for inductance under inverter rated output frequency；
ωNRated output frequency for inverter power supply device；
L is the inductance value of inductance；
E is voltage magnitude of the inverter dc bus with respect to neutral point；
VmFor rated output voltage peak value；
TsFor switch periods.
When the inductance L of selection meets condition (3), the switching tube into inverter circuit 12 applies corresponding drive control letter
Number, the waveform of obtained inductive current is as shown in Figure 2.Inverter power supply device can be made to work in discontinuous conducting using inductance L
Pattern, TsFor a switch periods of switching tube in inverter circuit 12, Ts=Ton+Toff, TonFor the turn-on time of switching tube, Toff
For the turn-off time of switching tube, in the time T of switching tube conductingon, inductive current rising, and always when switching tube turns off
Reach maximum quarter；In switching tube turn-off time Toff, inductive current is begun to decline, and opens moment t2 next time in switching tube
T1 falls to 0 at the time of before.The next switch periods of switching tube repeat the above process, and inversion electricity can be realized by inductance L
Source device works in discontinuous conducting state.At this point it is possible to the service time T by effectively controlling switching tubeonDuring with shutdown
Between Toff, make have regular hour allowance between t1 the and t2 moment, realize the zero current turning-on of switching tube, reach the effect of Sofe Switch
Fruit.
Inductance L also acts as the effect of filtering in circuit, is typically chosen under rated frequency in practice, the mark of inductance induction reactance
One value is less than 1% inductance L, and the inductance value of the inc air core inductor of general magnetic core magnetic circuit is generally smaller, therefore, described
Inductance L can be the inc air core inductor in magnetic core magnetic road.It can also be effectively using the inc air core inductor L of magnetic core magnetic circuit
Reduce inductance volume, reduce core loss, that is, reduce ferromagnetic loss.
Optionally, as shown in Figure 1, described device further includes：
First capacitance C1, the second capacitance C2 and at least one third capacitance C3.
The first capacitance C1 and the second capacitance C2 is composed in series series circuit, the series circuit and the direct current
Source 11 is in parallel；
One end of the third capacitance C3 is connected with the output terminal of the inverter circuit 12, and the third capacitance C3's is another
End is connected with the connecting pin of the first capacitance C1 and the second capacitance C2.
First capacitance C1 and the second capacitance C2 can stablize the voltage at 12 both ends of inversion course direct source, it is ensured that device is reliable
Work.Third capacitance C3 is played a filtering role, and 3 filter capacitor C3 are illustratively set in Fig. 1, it is defeated can to filter out inverter circuit 12
The fractional harmonic of outlet.
Inverter circuit is three-phase inversion bridge circuit in the present embodiment, illustrative to set three inductance L and three capacitance C3,
All there are one inductance L and capacitance C3 for each phase.When the form of inverter circuit 12 changes, inductance L and electricity can be set accordingly
Hold the number of C3.
Technical solution provided in this embodiment reduces electricity using small inductor (such as inc air core inductor of magnetic core magnetic circuit)
Feel volume, improve power density, while be greatly reduced or eliminate core loss；And it works in inverter discontinuously to lead
Logical pattern can realize the Sofe Switch of device for power switching in inverter circuit, greatly in the case of without extra resonance circuit
Width reduces switching loss, so as to substantially reduce the volume and weight of radiator, is effectively improved inverter power supply device
Power density.
Embodiment two
Fig. 3 is a kind of structure diagram of the modulation control unit of inverter power supply device provided by Embodiment 2 of the present invention.
Referring to Fig. 3, on the basis of above-described embodiment one, the modulation control unit 210 includes：
Current control subelement 211, for according to zero-crossing timing of the current signal from peak-fall to zero, control
The low level duration of the PWM driving control signal, so that inductive current is in discrete state always；
Voltage controls subelement 212, for the comparison result according to the voltage signal and standard sine wave voltage signal,
The high level duration of the PWM driving control signal is controlled, so that inductive current is in discrete state always；
Wherein, for switching tube to be controlled to disconnect, high level switchs the low level of the PWM driving control signal for controlling
Pipe is connected, and the PWM driving control signal controls switching tube turn-on and turn-off above and below in the inverter circuit respectively.
Current control subelement controls PWM driving control signal according to current signal, primarily to ensuring in inductance
Electric current opens the power tube in inverter circuit when being 0, i.e., according to zero-crossing timing of the current signal from peak-fall to zero, control
The low level duration of the PWM driving control signal, can be such that inductive current changes since 0 ampere, and in inverter circuit
The switch periods of switching tube return to 0 ampere before terminating.
Illustratively, referring to Fig. 4, voltage and current sampling unit output PWM driving control signal, switching tube in power circuit
Open-minded at the t0 moment, t0-t1 clock switches pipe is in opening state, and inductive current is begun to ramp up in the t0-t1 times from 0, in t1
When reach peak value, t1 turns off the moment for switching tube.It cannot be mutated in t1 moment inductive current, direction does not also change, inductance electricity
Stream is begun to decline, and 0 is fallen at the t2 moment, is started not yet in the next switch periods of t2 moment switching tubes, for inverter bridge
Circuit, in the t1-t2 times, upper and lower two switching tubes can pass through the anti-paralleled diode afterflow of switching tube all in off state.
T1-t2 is zero-crossing timing of the current signal from peak-fall to zero, and t1-t3 is the low level duration of PWM driving control signal,
Current control subelement can control the time of t1-t3 according to zero-crossing timing of the current signal from peak-fall to zero, so that
Inductive current in discrete state, i.e., is always zero in t2-t3 time inductive currents, between two neighboring controlling cycle, electricity
Inducing current is interrupted always.At the t3 moment, switching tube enters next switch periods, and switching tube is connected again.At this point, due to inductance
Electric current is zero, and the electric current of switching tube opening process is zero, can realize the lossless open-minded of switching tube, realizes Sofe Switch effect,
Reduce the turn-on consumption of switching tube.Switching device in time inverter circuit after the t4 moment repeats the change of above-mentioned state
Change.The above process shows the low level duration by controlling PWM driving control signal, can realize the Sofe Switch of switching tube.
Inverter circuit can be made to work in discontinuous conduction mode using inductance, control the conducting of switching tube on this basis
Time and turn-off time can realize the lossless open-minded of switching tube.In the application, inverter power supply device is usually and needs to export
Sine voltage, voltage control comparison result of the subelement according to voltage signal and standard sine wave voltage signal, described in control
The high level duration of PWM driving control signal can make inverter power supply device export sine voltage.When needing to export other classes
During the signal of type, voltage signal with corresponding modulated signal can be compared, by corresponding control algolithm, control PWM
The duty ratio of driving control signal.
Technical solution provided in this embodiment, current control subelement export the low level of pwm control signal by control
Duration makes inverter work in discontinuous conduction mode, and inverter circuit is realized in the case of without extra resonance circuit
The Sofe Switch of middle device for power switching, reduces switching loss；Voltage controls subelement according to voltage signal and standard sine wave
The comparison result of voltage signal controls the high level duration of the PWM driving control signal, makes inverter power supply device outputting standard
Sine voltage, enable inverter to arbitrary load provide standard sine wave supply voltage.
Embodiment three
Fig. 5 is a kind of control structure schematic diagram of the voltage control subelement of inverter power supply device provided in this embodiment.
On the basis of above-described embodiment two, the voltage control subelement is specifically used for：
The voltage signal and the standard sine wave voltage signal are compared, determine difference；
If the difference is more than given threshold, according to difference direction and size of the difference, the setting is improved or reduced
The high level duration of PWM driving control signal.
Wherein, carrier modulation is carried out using standard sine wave voltage signal, the sine of inverter circuit outputting standard can be made
Wave.Voltage signal and standard sine wave voltage signal are compared, determine difference；Then according to difference direction and size of the difference,
The high level duration of the setting PWM driving control signal is improved or reduced, the duty of PWM driving control signal can be adjusted
Than so that difference is eliminated therebetween, it is ensured that the sine voltage of inverter circuit outputting standard.It specifically, can be with referring to Fig. 5
In the beginning of k-th of switch periods of switching tube, pass through the voltage sampling signal u that will be exported to loado(k) and reference instruction
Voltage ur(k) compare, determine difference, the size of the duty ratio d (k) of the switching tube exported according to corresponding to mathematic interpolation, and root
Switching device action is controlled according to control signal d (k), voltage sampling signal can be obtained by voltage and current sampling unit.Wherein, it accounts for
Sky is than in each switch periods of switching tube, the time that inductive current persistently rises accounts for the ratio of entire switch periods.
Technical solution provided in this embodiment can realize switching tube Sofe Switch in inversion electricity circuit, and make inversion electric
The sine voltage of road outputting standard enables inverter to provide standard sine wave supply voltage to arbitrary load.
Example IV
Fig. 6 is a kind of flow diagram of the control method for inverter power supply device that the embodiment of the present invention four provides.It is described
Method can be performed by the inverter power supply device in above-mentioned any embodiment, can specifically be performed by modulation control unit.Referring to
Fig. 6, the control method of inverter provided in this embodiment specifically include：
S310, into the inverter circuit switching tube control terminal output pulse width modulation (PWM) driving control signal；
S320, the voltage signal exported according to the voltage and current sampling unit and current signal control the PWM to drive
Control signal.
Further, according to zero-crossing timing of the current signal from peak-fall to zero, the PWM drivings control is controlled
The low level duration of signal processed, so that inductive current is in discrete state always；
According to the voltage signal and the comparison result of standard sine wave voltage signal, the PWM drive controls is controlled to believe
Number high level duration；
Wherein, for switching tube to be controlled to disconnect, high level switchs the low level of the PWM driving control signal for controlling
Pipe is connected, and the PWM driving control signal controls switching tube turn-on and turn-off above and below in the inverter circuit respectively.
Further, the comparison result according to the voltage signal and standard sine wave voltage signal, described in control
The high level duration of PWM driving control signal, including：
The voltage signal and the standard sine wave voltage signal are compared, determine difference；
If the difference is more than given threshold, according to difference direction and size of the difference, improves or reduce the PWM and drive
The high level duration of dynamic control signal.
Technical solution provided in this embodiment, using corresponding control strategy, in the case of without extra resonance circuit
The Sofe Switch of device for power switching in inverter circuit is realized, greatly reduces switching loss, so as to substantially reduce heat dissipation
The volume and weight of device, is effectively improved the power density of inverter power supply device, and makes inverter circuit outputting standard just
String wave voltage enables inverter to provide standard sine wave supply voltage to arbitrary load, suitable for various middle low powers three
Phase and single-phase inverter apparatus.
Embodiment five
Fig. 7 is a kind of inverter power supply device topological structure schematic diagram that the embodiment of the present invention five provides.The present embodiment is base
In the topological structure of single-phase semi-bridge inversion power supply shown in fig. 7, the MATLAB/Simulink for establishing inverter power supply device is imitated
True mode simultaneously completes simulating, verifying.Output voltage waveforms 411, defeated when referring to Fig. 8, in Fig. 8 being inverter power supply device zero load
Go out current waveform 412 and inductive current waveform 413.Referring to Fig. 9, in Fig. 9 for inverter power supply device with resistive load when output
Voltage waveform 421, output current wave 422 and inductive current waveform 423.It is inverter power supply device band in Figure 10 referring to Figure 10
Output voltage waveforms 431, output current wave 432 and inductive current waveform 433 during nonlinear load.
Figure 11 is the envelope diagram of the inductive current waveform in low frequency.Fig. 8, Fig. 9, Figure 10 and Figure 11 show in band arbitrary load
When, inverter power supply device can work in discontinuous conduction mode.And inversion can be controlled under discontinuous conduction mode
Supply unit quickly and accurately tracks input command voltage, realizes the Sofe Switch of switching device in inverter power supply device, effectively carries
High inverter power supply device efficiency.
Note that it above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiment described here, can carry out for a person skilled in the art various apparent variations,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
It can include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (7)
1. a kind of inverter power supply device, which is characterized in that including：DC source, inverter circuit, inductance, voltage sensor, electric current pass
Sensor, voltage and current sampling unit and modulation control unit；Wherein,
The DC source is connected with the inverter circuit；
The output terminal of the inverter circuit is connected by the inductance with load；
The input terminal of the voltage and current sampling unit passes through the voltage sensor and current sensor and the inverter circuit
Output terminal be connected, for collection voltages signal and current signal；
The output terminal of the voltage and current sampling unit is connected with the input terminal of the modulation control unit, for will be collected
Voltage signal and current signal are exported to the modulation control unit；
The output terminal of the modulation control unit is connected with the input terminal of the inverter circuit, for being adopted according to the voltage and current
The voltage signal of sample unit output and current signal generation pulse-width modulation PWM driving control signal, to control the inverter circuit
Middle switching tube turn-on and turn-off；
Wherein, the modulation control unit includes：
Current control subelement, for according to zero-crossing timing of the current signal from peak-fall to zero, controlling the PWM
The low level duration of driving control signal, so that inductive current is in discrete state always；
Voltage controls subelement, for the comparison result according to the voltage signal and standard sine wave voltage signal, controls institute
State the high level duration of PWM driving control signal；
Wherein, for switching tube to be controlled to disconnect, high level is used to that switching tube to be controlled to lead the low level of the PWM driving control signal
Logical, the PWM driving control signal controls switching tube turn-on and turn-off above and below in the inverter circuit respectively.
2. the apparatus according to claim 1, which is characterized in that the voltage control subelement is specifically used for：
The voltage signal and the standard sine wave voltage signal are compared, determine difference；
If the difference is more than given threshold, according to difference direction and size of the difference, improves or reduce the setting PWM and drive
The high level duration of dynamic control signal.
3. the apparatus according to claim 1, which is characterized in that the induction reactance perunit value of the inductance LFor：
Wherein：Induction reactance value for inductance under inverter rated output frequency；
Rated output frequency for inverter power supply device；
Inductance value for inductance；
For voltage magnitude of the inverter dc bus with respect to neutral point；
For rated output voltage peak value；
For switch periods；
RBA reference value for inductance induction reactance.
4. device according to claim 3, which is characterized in that the inductance is the inc air core inductor of magnetic core magnetic circuit.
5. the apparatus according to claim 1, which is characterized in that further include：
First capacitance, the second capacitance and at least one third capacitance；
First capacitance is composed in series series circuit with second capacitance, and the series circuit is in parallel with the DC source；
One end of the third capacitance is connected with the output terminal of the inverter circuit, the other end of the third capacitance and described the
One capacitance is connected with the connecting pin of second capacitance.
6. a kind of control method of inverter power supply device is performed using any inverter power supply devices of claim 1-5,
It is characterized in that, the method includes：
The control terminal output pulse width modulation (PWM) driving control signal of switching tube into the inverter circuit；
The voltage signal and current signal exported according to the voltage and current sampling unit controls the PWM driving control signal；
Wherein, the voltage signal exported according to the voltage and current sampling unit and current signal control the PWM to drive
Signal is controlled, including：
According to zero-crossing timing of the current signal from peak-fall to zero, the low electricity of the PWM driving control signal is controlled
It usually grows, so that inductive current is in discrete state always；
According to the voltage signal and the comparison result of standard sine wave voltage signal, the PWM driving control signal is controlled
High level duration；
Wherein, for switching tube to be controlled to disconnect, high level is used to that switching tube to be controlled to lead the low level of the PWM driving control signal
Logical, the PWM driving control signal controls switching tube turn-on and turn-off above and below in the inverter circuit respectively.
7. control method according to claim 6, which is characterized in that described according to the voltage signal and standard sine wave
The comparison result of voltage signal controls the high level duration of the PWM driving control signal, including：
The voltage signal and the standard sine wave voltage signal are compared, determine difference；
If the difference is more than given threshold, according to difference direction and size of the difference, the PWM drivings control is improved or reduced
The high level duration of signal processed.
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| CN113224966B (en) * | 2020-01-17 | 2023-08-22 | 昱能科技股份有限公司 | Control method and system of three-phase grid-connected inverter and three-phase grid-connected inverter |
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| CN103746585A (en) * | 2014-01-10 | 2014-04-23 | 南京理工大学 | Hybrid modulation-based control method for mid-point voltage balance of multilevel inverter |
| CN103888013A (en) * | 2014-03-31 | 2014-06-25 | 盐城工学院 | Minitype inverter based on high-frequency alternating-current voltage reduction theory and digital control device thereof |
| CN104009620A (en) * | 2014-06-16 | 2014-08-27 | 南京航空航天大学 | Control type soft-switching technology for inverter |
| CN105048490A (en) * | 2015-06-24 | 2015-11-11 | 盐城工学院 | Low current stress photovoltaic micro inverter and digital control device associated with the same |
| CN205725498U (en) * | 2015-12-31 | 2016-11-23 | 广东志成冠军集团有限公司 | A kind of inverter power supply device |
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| CN103746585A (en) * | 2014-01-10 | 2014-04-23 | 南京理工大学 | Hybrid modulation-based control method for mid-point voltage balance of multilevel inverter |
| CN103888013A (en) * | 2014-03-31 | 2014-06-25 | 盐城工学院 | Minitype inverter based on high-frequency alternating-current voltage reduction theory and digital control device thereof |
| CN104009620A (en) * | 2014-06-16 | 2014-08-27 | 南京航空航天大学 | Control type soft-switching technology for inverter |
| CN105048490A (en) * | 2015-06-24 | 2015-11-11 | 盐城工学院 | Low current stress photovoltaic micro inverter and digital control device associated with the same |
| CN205725498U (en) * | 2015-12-31 | 2016-11-23 | 广东志成冠军集团有限公司 | A kind of inverter power supply device |
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