CN105356733A - Two-stage inverter for eliminating input current ripple, and control method thereof - Google Patents
Two-stage inverter for eliminating input current ripple, and control method thereof Download PDFInfo
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- CN105356733A CN105356733A CN201510740366.7A CN201510740366A CN105356733A CN 105356733 A CN105356733 A CN 105356733A CN 201510740366 A CN201510740366 A CN 201510740366A CN 105356733 A CN105356733 A CN 105356733A
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- inverter
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Classifications
-
- 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
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
Abstract
The invention discloses a two-stage inverter for eliminating input current ripples, and a control method thereof. The two-stage inverter comprises a DC power supply, an input capacitor, a primary-side switching tube, an isolating transformer, a secondary-side switching tube, an intermediate DC bus capacitor, a first inverter bridge arm, a second inverter bridge arm, a filtering circuit, an auxiliary switching tube and an auxiliary capacitor. The control method comprises the steps that: current reference is obtained through sending an inverter bridge arm input current sampling value, an intermediate DC bus voltage sampling value to a benchmark generating circuit, and the current is controlled to track its reference value through a modulation wave generating module, a PWM control circuit, a zero-crossing comparator, a logic circuit and a driving circuit. The two-stage inverter is additionally provided with the auxiliary switching tube and the auxiliary capacitor at an auxiliary winding side of the isolating transformer, so that power ripples led from an AC output side flow to an auxiliary circuit, thereby achieving the purpose of eliminating current ripples at a DC input side. The primary-side switching tube is zero current turning-on, the secondary-side switching tube is zero current turning-off, and the switching loss is reduced.
Description
Technical field
The present invention relates to a kind of two-stage type inverter and the control method thereof of eliminating input current ripple.
Background technology
Along with the increase day by day of energy-output ratio, the limited fossil fuel of reserves reduces and exhausted at last day by day, and development new forms of energy power technology that is clean, efficient, sustainable development has become very urgent task.In new forms of energy and other distributed generation system, for obtaining the High Level AC Voltage needed for load, the inverter with prime DC converter is widely used.Such as shown in accompanying drawing 1, it is one typical flyback two-stage type inverter.For this system, the two frequency multiplication power pulsations contained in output AC power feed back to direct current input side and show as low-frequency current ripple, the useful life of the input source such as storage battery, fuel cell can be affected, the stability of DC power system can be disturbed time serious, therefore solve the current ripples problem in grid-connected power generation system, the utilization ratio improving new forms of energy is very urgent.In recent years, in order to address this problem, occur that some are about the inverter topology and the control strategy that suppress current ripples.In circuit and the United Nations General Assembly's electrochemical capacitor or LC resonant circuit, by resonant circuit frequency is designed to twice output frequency, the object eliminating current ripples can be realized, but the useful life of electrochemical capacitor is limited, and want the inductance needed for filtering low-frequency current ripple and electric capacity volume all larger, reduce reliability and the power density of system.Also can have access to source filter in circuit, but the extra circuit increased must need extra control system, what whole system was all become is comparatively complicated, is unfavorable for integration.And auxiliary circuit is embedded in original converter, only need suitably to improve the elimination that original control method just can realize direct current input side current ripples.
Summary of the invention
The object of the invention is to provide a kind of two-stage type inverter and the control method thereof of eliminating input current ripple for the technological deficiency existing for above-mentioned inverter, this inverter can not only realize direct current and become the inversion exchanged, and eliminate the current ripples of direct current input side simultaneously, reduce the interference of input current ripple to input source, improve system effectiveness.
The present invention for achieving the above object, adopts following technical scheme:
A kind of two-stage type inverter eliminating input current ripple comprises DC power supply, input capacitance, former limit switching tube, isolating transformer, secondary-side switch pipe, intermediate dc bus capacitor, the first inverter bridge leg that structure is identical and the second inverter bridge leg and filter circuit, wherein the positive pole of DC power supply connects one end of input capacitance and the former limit Motor Winding Same Name of Ends of isolating transformer respectively, the negative pole of DC power supply connects the other end of input capacitance and the emitter of former limit switching tube respectively, the collector electrode of former limit switching tube connects the former limit winding different name end of isolating transformer, the collector electrode of secondary-side switch pipe connects the vice-side winding different name end of isolating transformer, two inverter bridge legs all comprise two switching tubes, the collector electrode of the first switching tube, the emitter of secondary-side switch pipe and one end of intermediate dc bus capacitor connect and compose the positive input terminal of inverter bridge leg, the emitter of second switch pipe, the vice-side winding Same Name of Ends of isolating transformer and the other end of intermediate dc bus capacitor connect and compose the negative input end of inverter bridge leg, the emitter of the first switching tube and the collector electrode of second switch pipe connect and compose the output of inverter bridge leg, the output of the first inverter bridge leg receives the anode of filter circuit, the output of the second inverter bridge leg receives the negative terminal of filter circuit, also comprise by two of isolating transformer auxiliary circuits that auxiliary winding, auxiliary switch and auxiliary capacitor are formed, wherein auxiliary switch comprises two switching tubes, and the auxiliary winding of isolating transformer is by the auxiliary winding N of the identical number of turn
x1, N
x2composition, the collector electrode of the first auxiliary switch meets the first auxiliary winding N
x1different name end, the emitter of the first auxiliary switch is connected with one end of auxiliary capacitor with the collector electrode of the second auxiliary switch respectively, and the emitter of the second auxiliary switch meets the second auxiliary winding N
x2same Name of Ends, the other end of auxiliary capacitor meets the first auxiliary winding N respectively
x1same Name of Ends and the second auxiliary winding N
x2different name end.
Eliminate a control method for the two-stage type inverter of input current ripple, wherein, the control method of inverter bridge leg is traditional single stage PWM; Further comprising the steps of:
Steps A, detects auxiliary capacitor voltage signal, intermediate dc bus voltage signal, the input current signal of inverter bridge leg;
Step B, the auxiliary capacitance voltage control circuit of auxiliary capacitor voltage signal steps A obtained input, obtains auxiliary capacitor voltage disturbance signal;
Step C, intermediate dc bus voltage signal steps A obtained input intermediate dc busbar voltage control circuit, obtains intermediate dc busbar voltage disturbing signal;
Step D, the input current signal input reference generative circuit of intermediate dc bus voltage signal steps A obtained and inverter bridge leg, obtains primary current reference signal and secondary current reference signal;
Step e, obtains auxiliary capacitor voltage disturbance signal and adds the primary current reference signal that step D obtains, obtain primary current actual reference signal by step B;
Step F, the intermediate dc busbar voltage disturbing signal obtained by step C adds the secondary current reference signal that step D obtains, and obtains secondary current actual reference signal;
Step G, the secondary current actual reference signal input modulating wave generative circuit that primary current actual reference signal step e obtained and step F obtain, obtains first, second, third modulation wave signal;
Step H, inputs pwm control circuit respectively by first, second modulation wave signal aforementioned, obtains first, second logical signal;
Step I, the 3rd modulation wave signal input zero-crossing comparator obtained by step G, obtains the 3rd logical signal;
Step J, by aforementioned first logical signal input logic circuit, in logic circuits first after logic inverter, then through logic inverter, obtains the control signal of former limit switching tube;
By aforementioned first, second, third logical signal input logic circuit respectively, first, second logical signal is after logic XOR gate in logic circuits, accesses logical AND gate, obtain the control signal of the first auxiliary switch together with the 3rd logical signal;
By aforementioned first, second, third logical signal input logic circuit respectively, first, second logical signal is through logic XOR gate in logic circuits, 3rd logical signal after logic inverter, then accesses logical AND gate together, obtains the control signal of the second auxiliary switch;
By aforementioned first, second, third logical signal input logic circuit respectively, the control signal of the first logical signal, the first auxiliary switch accesses logic OR not gate together with the control signal of the second auxiliary switch in logic circuits, obtains the control signal of secondary-side switch pipe;
Step K, the control signal of the former limit switching tube that step J is obtained, the control signal of the first auxiliary switch, the control signal of the second auxiliary switch and the control signal of secondary-side switch pipe input driving circuit respectively, obtain the drive singal of former limit switching tube, the drive singal of secondary-side switch pipe and the drive singal of two auxiliary switches, control this two-stage type inverter.
The technical characteristics of the present invention compared with original technology is, because secondary adds auxiliary winding, by the shutoff of opening controlling auxiliary switch (9), ripple is transferred on auxiliary capacitor (10), thus the elimination realized input current ripple, and the function of traditional two-stage type inverter is also kept.
Accompanying drawing explanation
Accompanying drawing 1 is traditional two-stage type inverter circuit structural representation.
Accompanying drawing 2 of the present inventionly a kind ofly eliminates the two-stage type converter main circuit of input current ripple and the structural representation of control method thereof.
Accompanying drawing 3 is a kind of electrical block diagrams eliminated in the two-stage type inverter of input current ripple after isolating transformer equivalence of the present invention.
Accompanying drawing 4 is a kind of two-stage type inverter key operation waveforms schematic diagrames eliminating input current ripple of the present invention.
Accompanying drawing 5 ~ accompanying drawing 9 is a kind of each switch mode schematic diagrames eliminating the two-stage type inverter of input current ripple of the present invention.
Accompanying drawing 10 is simulation waveforms that the present invention is applied to input current, auxiliary capacitor voltage, secondary current and intermediate dc busbar voltage under output voltage 220V/50Hz occasion.
Accompanying drawing 11 is that the present invention is applied to intermediate dc busbar voltage, the input current of inverter bridge leg and the simulation waveform of output voltage under output voltage 220V/50Hz occasion.
Primary symbols title in above-mentioned accompanying drawing: V
i, supply voltage.C
i, input capacitance.S
p, S
s, S
1~ S
4, S
x1, S
x2, power switch pipe.C
dc, intermediate dc bus capacitor.T
r, isolating transformer.N
1, isolating transformer former limit winding.N
2, isolating transformer vice-side winding.L
m, magnetizing inductance.L
f, filter inductance.C
f, filter capacitor.R
l, load.N
x1, N
x2winding assisted by isolating transformer.C
x, auxiliary capacitor.V
x, auxiliary capacitor both end voltage.V
dc, intermediate dc busbar voltage.V
o, inverter output voltage.
Embodiment
Be described in detail below in conjunction with the technical scheme of accompanying drawing to invention:
Shown in accompanying drawing 2 is a kind ofly eliminate the two-stage type converter main circuit of input current ripple and the structural representation of control method thereof.By DC power supply V
i, input capacitance 1, former limit switching tube 2, isolating transformer 3, secondary-side switch pipe 4, intermediate dc bus capacitor 5, two inverter bridge legs 6 and 7, filter circuit 8, auxiliary switch 9 and auxiliary capacitors 10 form.S
p, S
s, S
1~ S
4, S
x1, S
x2eight power switch pipes, C
iinput capacitance, T
risolating transformer, C
xauxiliary capacitor, C
dcintermediate dc bus capacitor, L
foutput inductor, C
foutput filter capacitor, R
lfor load.V
o, inverter output voltage.
Detect auxiliary capacitor voltage signal v
x, intermediate dc bus voltage signal v
dc, the input current signal i of inverter bridge leg
inv; By auxiliary capacitor voltage signal v
xthe auxiliary capacitance voltage control circuit of input, obtains auxiliary capacitor voltage disturbance signal; By intermediate dc bus voltage signal v
dcinput intermediate dc busbar voltage control circuit, obtains intermediate dc busbar voltage disturbing signal; By intermediate dc bus voltage signal v
dcwith the input current signal i of inverter bridge leg
invinput reference generative circuit, obtains primary current reference signal I
1-rwith secondary current reference signal i
2-r; Auxiliary capacitor voltage disturbance signal is added primary current reference signal I
1-r, obtain primary current actual reference signal I
1-ref, intermediate dc busbar voltage disturbing signal is added secondary current reference signal i
2-r, obtain secondary current actual reference signal i
2-ref, by primary current actual reference signal I
1-refwith secondary current actual reference signal i
2-refinput modulating wave generative circuit, obtains the first modulation wave signal M
1, the second modulation wave signal M
2with the 3rd modulation wave signal M
3; By the first modulation wave signal M
1with the second modulation wave signal M
2input pwm control circuit respectively, obtain the first logical signal C
1with the second logical signal C
2; By the 3rd modulation wave signal M
3input zero-crossing comparator, obtains the 3rd logical signal C
3; By the first logical signal C
1input logic circuit, in logic circuits first after logic inverter, then through logic inverter, obtains the control signal Q of former limit switching tube
p; By the first logical signal C
1, the second logical signal C
2with the 3rd logical signal C
3input logic circuit, in logic circuits the first logical signal C respectively
1with the second logical signal C
2after logic XOR gate, and the 3rd logical signal C
3access logical AND gate together, obtain the control signal Q of the first auxiliary switch
x1; By the first logical signal C
1, the second logical signal C
2with the 3rd logical signal C
3input logic circuit, in logic circuits the first logical signal C respectively
1with the second logical signal C
2through logic XOR gate, the 3rd logical signal C
3after logic inverter, then access logical AND gate together, obtain the control signal Q of the second auxiliary switch
x2; By the first logical signal C
1, the second logical signal C
2with the 3rd logical signal C
3input logic circuit, in logic circuits the first logical signal C respectively
1, the first auxiliary switch control signal Q
x1with the control signal Q of the second auxiliary switch
x2access logic OR not gate together, obtain the control signal Q of secondary-side switch pipe
s; By the control signal Q of former limit switching tube
p, the control signal Q of the first auxiliary switch
x1, the control signal Q of the second auxiliary switch
x2and the control signal Q of secondary-side switch pipe
sinput driving circuit, obtains the drive singal S of former limit switching tube respectively
p, secondary-side switch pipe drive singal S
sand the drive singal S of two auxiliary switches
x1/ S
x2, control this two-stage type inverter.
In order to easy analysis, below for the main circuit structure accompanying drawing 3 after accompanying drawing 2 equivalence, 4 ~ accompanying drawing 9 describes specific works principle of the present invention by reference to the accompanying drawings.Having 8 kinds of switch mode by accompanying drawing 4 known whole inverter switch periods, is [t respectively
i0-t
i1], [t
i1-t
i2], [t
i2-t
i3], [t
i3-t
i4], [t
iI0-t
iI1], [t
iI1-t
iI2], [t
iI2-t
iI3], [t
iI3-t
iI4], wherein, [t
i0-t
i4] be the switch periods of under pattern I, [t
iI0-t
iI4] be the switch periods of under pattern II.Below the working condition of each switch mode is made a concrete analysis of.
Before analysis, first make the following assumptions: 1. all switching tubes are ideal component; 2. the leakage inductance after isolating transformer equivalence is ignored.
Below the working condition of switch mode each under pattern I is made a concrete analysis of.
1. switch mode 1 [t
i0-t
i1] [corresponding to accompanying drawing 5]
S
pconducting, S
s, S
x1and S
x2cut-off, input voltage V
idirectly be added on the winding of isolating transformer former limit, primary current i
1linearly rise to the actual reference value I of primary current
1-ref.I
1t () can be expressed as
Wherein, t
i1moment, i
1(t
i1)=I
1-ref.
First modulation wave signal M
1can be expressed as:
Wherein, T
sfor switch periods.
2. switch mode 2 [t
i1-t
i2] [corresponding to accompanying drawing 6]
T
i1moment, S
pturn off, S
x1conducting, isolating transformer is to auxiliary capacitor C
xcharging, auxiliary capacitor both end voltage v
xoppositely be added on the first auxiliary winding of isolating transformer, because this process time is extremely short, v
xcan be considered constant pressure source, thus flow through the current i of auxiliary capacitor
x1linearly decline.I
x1t () can be expressed as
Wherein, n is the isolating transformer turn ratio, n=N
2: N
1=N
x1: N
1=N
x2: N
1; t
i2moment, i
x1(t
i2)=i
2-ref(t
i2).
Second modulation wave signal M
2can be expressed as:
3rd modulation wave signal M
3can be expressed as:
M
3=I
1-ref-ni
2-ref(5) 3. switch mode 3 [t
i2-t
i3] [corresponding to accompanying drawing 8]
T
i2moment, S
x1turn off, S
sconducting, intermediate dc busbar voltage v
dcoppositely be added on isolating transformer vice-side winding, flow through the current i of vice-side winding
2from the actual reference value i of secondary current
2-refdrop to zero.Intermediate dc bus capacitor C
dcbe considered as constant voltage source, then secondary current i
2linearly change.In this process, i
2t the relational expression of () is as follows:
Wherein, t
i2moment, i
2(t
i2)=i
x1(t
i2); t
i3moment, i
2(t
i3)=0.
4. switch mode 4 [t
i3-t
i4] [corresponding to accompanying drawing 9]
Secondary current i
2after dropping to zero, secondary-side switch pipe S
sdo not turn off immediately, but next switch periods just turns off at first by the time.In the process, the former limit of isolating transformer, secondary and auxiliary winding all do not have electric current, and transformer resets.Energy needed for load will by the direct bus capacitor C in centre
dcthere is provided.
Below the working condition of switch mode each under pattern II is made a concrete analysis of.
1. switch mode 1 [t
iI0-t
iI1] [corresponding to accompanying drawing 5]
This process is identical with the switch mode 1 under pattern I, and DC power supply is to transformer transferring energy.Due to primary current i
1peak value be constant I
1-ref, and high fdrequency component will flow through input capacitance, so input current I
ialso be a DC quantity.
2. switch mode 2 [t
iI1-t
iI2] [corresponding to accompanying drawing 7]
Be different from the switch mode 2 under pattern I, in this process, S
x2open instead of S
x1, auxiliary capacitor C
xto isolating transformer charging, auxiliary capacitor both end voltage v
xforward is added on the second auxiliary winding of isolating transformer, thus flows through the current i of auxiliary capacitor
x2linear rising.I
x2t () can be expressed as
3. switch mode 3 [t
iI2-t
iI3] [corresponding to accompanying drawing 8]
Switch mode 3 under this process and pattern I is similar, is stored in energy in isolating transformer to rear class transmission.
4. switch mode 4 [t
iI3-t
iI4] [corresponding to accompanying drawing 9]
This process is consistent with the switch mode 4 under pattern I, and intermediate dc bus capacitor maintains the energy needed for load.
Figure 10 and Figure 11 is that the present invention is applied to simulation waveform under output voltage 220V/50Hz occasion.As can be seen from simulation waveform, input current is DC quantity, and auxiliary capacitor voltage comprises two frequency multiplication pulsating voltage components, illustrates that pulsating power can be transferred in auxiliary circuit by this two-stage type inverter, thus well eliminates low frequency input current ripple.
Can learn from above description, the present invention propose a kind of eliminate input current ripple two-stage type inverter and control method there is the advantage of following several respects:
1) owing to increasing auxiliary circuit, the low-frequency current ripple that inversion outlet side is introduced is transferred on auxiliary capacitor, therefore inverter input terminal only relies on very little electric capacity filtering switching harmonics component just can realize the object of input current ripple elimination, and control circui is simple.
2) electric capacity in inverter all can adopt the thin-film capacitor of low-capacitance, and the switching frequency of system is high, and isolating transformer is relatively little, and therefore system bulk is little, long service life.
3) because former limit switching tube is zero current turning-on, secondary-side switch pipe is zero-current switching, and therefore switching loss is little, improves system effectiveness.
Claims (2)
1. eliminate the two-stage type inverter of input current ripple for one kind, comprise DC power supply, input capacitance (1), former limit switching tube (2), isolating transformer (3), secondary-side switch pipe (4), intermediate dc bus capacitor (5), the first inverter bridge leg (6) that structure is identical and the second inverter bridge leg (7) and filter circuit (8), wherein the positive pole of DC power supply connects one end of input capacitance (1) and the former limit Motor Winding Same Name of Ends of isolating transformer (3) respectively, the negative pole of DC power supply connects the other end of input capacitance (1) and the emitter on former limit switching tube (2) respectively, the collector electrode on former limit switching tube (2) connects the former limit winding different name end of isolating transformer (3), the collector electrode of secondary-side switch pipe (4) connects the vice-side winding different name end of isolating transformer (3), two inverter bridge legs (6) and (7) all comprise two switching tubes, the collector electrode of the first switching tube, the emitter of secondary-side switch pipe (4) and one end of intermediate dc bus capacitor (5) connect and compose the positive input terminal of inverter bridge leg, the emitter of second switch pipe, the vice-side winding Same Name of Ends of isolating transformer (3) and the other end of intermediate dc bus capacitor (5) connect and compose the negative input end of inverter bridge leg, the emitter of the first switching tube and the collector electrode of second switch pipe connect and compose the output of inverter bridge leg, the output of the first inverter bridge leg (6) receives the anode of filter circuit (8), the output of the second inverter bridge leg (7) receives the negative terminal of filter circuit (8), it is characterized in that:
Also comprise the auxiliary circuit be made up of two auxiliary windings of isolating transformer (3), auxiliary switch (9) and auxiliary capacitor (10); Wherein auxiliary switch (9) comprises two switching tubes, and the auxiliary winding of isolating transformer (3) is by the auxiliary winding N of the identical number of turn
x1, N
x2composition, the collector electrode of the first auxiliary switch meets the first auxiliary winding N
x1different name end, the emitter of the first auxiliary switch is connected with one end of auxiliary capacitor (10) with the collector electrode of the second auxiliary switch respectively, and the emitter of the second auxiliary switch meets the second auxiliary winding N
x2same Name of Ends, the other end of auxiliary capacitor (10) meets the first auxiliary winding N respectively
x1same Name of Ends and the second auxiliary winding N
x2different name end.
2. a kind of two-stage type inverter eliminating input current ripple as claimed in claim 1, wherein, the control method of inverter bridge leg is traditional single stage PWM; It is characterized in that, the control method of this two-stage type inverter is further comprising the steps of:
Steps A, detects auxiliary capacitor voltage signal, intermediate dc bus voltage signal, the input current signal of inverter bridge leg;
Step B, the auxiliary capacitance voltage control circuit of auxiliary capacitor voltage signal steps A obtained input, obtains auxiliary capacitor voltage disturbance signal;
Step C, intermediate dc bus voltage signal steps A obtained input intermediate dc busbar voltage control circuit, obtains intermediate dc busbar voltage disturbing signal;
Step D, the input current signal input reference generative circuit of intermediate dc bus voltage signal steps A obtained and inverter bridge leg, obtains primary current reference signal and secondary current reference signal;
Step e, obtains auxiliary capacitor voltage disturbance signal and adds the primary current reference signal that step D obtains, obtain primary current actual reference signal by step B;
Step F, the intermediate dc busbar voltage disturbing signal obtained by step C adds the secondary current reference signal that step D obtains, and obtains secondary current actual reference signal;
Step G, the secondary current actual reference signal input modulating wave generative circuit that primary current actual reference signal step e obtained and step F obtain, obtains first, second, third modulation wave signal;
Step H, inputs pwm control circuit respectively by first, second modulation wave signal aforementioned, obtains first, second logical signal;
Step I, the 3rd modulation wave signal input zero-crossing comparator obtained by step G, obtains the 3rd logical signal;
Step J, by aforementioned first logical signal input logic circuit, in logic circuits first after logic inverter, then through logic inverter, obtains the control signal of former limit switching tube;
By aforementioned first, second, third logical signal input logic circuit respectively, first, second logical signal is after logic XOR gate in logic circuits, accesses logical AND gate, obtain the control signal of the first auxiliary switch together with the 3rd logical signal;
By aforementioned first, second, third logical signal input logic circuit respectively, first, second logical signal is through logic XOR gate in logic circuits, 3rd logical signal after logic inverter, then accesses logical AND gate together, obtains the control signal of the second auxiliary switch;
By aforementioned first, second, third logical signal input logic circuit respectively, the control signal of the first logical signal, the first auxiliary switch accesses logic OR not gate together with the control signal of the second auxiliary switch in logic circuits, obtains the control signal of secondary-side switch pipe;
Step K, the control signal of the former limit switching tube that step J is obtained, the control signal of the first auxiliary switch, the control signal of the second auxiliary switch and the control signal of secondary-side switch pipe input driving circuit respectively, obtain the drive singal of former limit switching tube, the drive singal of secondary-side switch pipe and the drive singal of two auxiliary switches, control this two-stage type inverter.
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| CN201510740366.7A CN105356733B (en) | 2015-11-02 | 2015-11-02 | A kind of two-stage type inverter and its control method for eliminating input current ripple |
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