CN104578852B - Solar photocell source converting system and operation method thereof - Google Patents
Solar photocell source converting system and operation method thereof Download PDFInfo
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- CN104578852B CN104578852B CN201310474454.8A CN201310474454A CN104578852B CN 104578852 B CN104578852 B CN 104578852B CN 201310474454 A CN201310474454 A CN 201310474454A CN 104578852 B CN104578852 B CN 104578852B
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- control signal
- power switch
- outputting inductance
- solar photovoltaic
- converting system
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Classifications
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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
-
- 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
-
- 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
Abstract
The invention discloses a solar photocell source converting system and an operation method thereof. The converting system is used for converting a DC input voltage into an AC output voltage. The solar photocell source converting system comprises an input capacitor group, a first converting circuit, a second converting circuit, a first filter circuit, a second filter circuit and a control circuit, wherein the first converting circuit comprises a first power switch and a second power switch; the second converting circuit comprises a third power switch and a fourth power switch; the control circuit generates a first control signal, a second control signal, a third control signal and a fourth control signal which respectively and correspondingly control the first power switch, the second power switch, the third power switch and the fourth power switch so as to reduce a leak current caused by a parasitic capacitance effect of the DC input voltage.
Description
Technical field
A kind of relevant solar photovoltaic power converting system of the present invention and its method of operating, it is espespecially a kind of to reduce parasitic capacitance
The solar photovoltaic power converting system of influence of leakage current caused by voltage and its method of operating.
Background technology
Refer to the circuit diagram that Fig. 1 is prior art dual buck inverter (dual-buck inverter).This is double down
Pressure type inverter receives a DC input voitage Vdc, and changes DC input voitage Vdc into an ac output voltage Vac.
The dual buck inverter includes two groups of reduction voltage circuits, respectively one first reduction voltage circuit BC1 and one second reduction voltage circuit BC2.
Wherein, first reduction voltage circuit BC1 mainly includes one first bridge arm Lg1a and one second bridge arm Lg2a, and first bridge arm
One first diode D1as of the Lg1a comprising first switch S1a with first switch S1a of connecting；Second bridge arm Lg2a is included
The one second diode D2a of one second switch S2a and the second switch S2a that connects.Second reduction voltage circuit BC2 mainly includes one
A 3rd bridge arm Lg3a and four bridge legs Lg4a, and the 3rd bridge arm Lg3a comprising one the 3rd switch S3a with connect the 3rd
One the 3rd diode D3a of switch S3a；The four bridge legs Lg4a switchs S4a and connects the 4th switch S4a's comprising one the 4th
One the 4th diode D4a.Additionally, the first reduction voltage circuit BC1 and second reduction voltage circuit BC2 is connected in parallel an input capacitance
C1a。
Coordinate the waveform diagram for the drive signal of prior art dual buck inverter referring to Fig. 2.Drive by one
Signal generating circuit it is (not shown) produce correspondence control first switch S1a, second switch S2a, the 3rd switch S3a and
The multiple control signal of the 4th switch S4a, respectively one first control signal Sca1, one second control signal Sca2, one the
Three control signals Sca3 and one the 4th control signal Sca4.
First control signal Sca1 is a complementary low frequency signal pair with second control signal Sca2.When the exchange output
When voltage Vac is positive half cycle (time t0～t1 is interval), first control signal Sca1 turns on the first switch for high level
S1a, second control signal Sca2 ends second switch S2a for low level.3rd control signal Sca3 is cut for low level
Only the 3rd S3a is switched, the 4th control signal Sca4 switches the 4th switch S4a for high frequency.As ac output voltage Vac
For negative half period when (time t1～t2 is interval), first control signal Sca1 ends first switch S1a for low level, and this second
Control signal Sca2 turns on second switch S2a for high level.3rd control signal Sca3 switches the 3rd switch for high frequency
S3a, the 4th control signal Sca4 ends the 4th switch S4a for low level.
However, under this dual buck inverter framework, because ac output voltage Vac changes greatly, therefore, cause to post
Raw electric capacity Cp1, the voltage change on Cp2 is larger, and produces fast-changing leakage current Icp1, Icp2, that is, parasitic capacitance electricity
Bucklingization is bigger, and leakage current more increases.
Therefore, a kind of solar photovoltaic power converting system and its method of operating how are designed, by two switching circuits
Dual buck inverter (dual-buck inverter) framework constituted with two filter circuits, there is provided the energy storage of energy-storage travelling wave tube
With release can path, and filter circuit is connected with the neutral point of input direct-current side, greatly reduces caused by parasitic capacitor voltage
The impact of leakage current, is to be intended to the big problem that row overcomes and solves by inventor.
The content of the invention
One purpose of the present invention is to provide a kind of direct current to deliver stream power conversion system, to overcome asking for prior art
Topic.Therefore solar photovoltaic power converting system of the present invention is to change a DC input voitage into an ac output voltage.This is too
Positive energy photo-voltaic power supply converting system includes an input capacitance group, one first switching circuit, one second switching circuit, one first filtering
Circuit, one second filter circuit and a control circuit.
The input capacitance group includes one first electric capacity and one second electric capacity, in first electric capacity and second capacitance connection one
Property point, and receive the DC input voitage.First switching circuit input capacitance group in parallel, comprising one first bridge in parallel
Arm and one second bridge arm.Second switching circuit input capacitance group in parallel, comprising one the 3rd bridge arm and one the 4th bridge in parallel
Arm.First filter circuit connects first switching circuit, and the outlet side of first filter circuit connects the neutral point.Should
Second filter circuit connects second switching circuit, and the outlet side of second filter circuit connects the neutral point.The control
Circuit produces multiple control signal, and first switching circuit and second switching circuit are controlled respectively, to reduce the direct current input
Leakage current caused by the parasitic capacitance effect of voltage.
Another object of the present invention is to a kind of method of operating of solar photovoltaic power converting system is provided, it is existing to overcome
There is the problem of technology.Therefore solar photovoltaic power converting system of the present invention is to change a DC input voitage into an exchange output
Voltage.The method of operating is comprised the steps of：A () provides an input capacitance group, receive the DC input voitage, the input capacitance
Group includes one first electric capacity and one second electric capacity, first electric capacity and the neutral point of the second capacitance connection one；B () provides one first
Switching circuit, input capacitance group in parallel, comprising one first bridge arm and one second bridge arm in parallel；C () provides one second and switches
Circuit, input capacitance group in parallel, comprising one the 3rd bridge arm and a four bridge legs in parallel；D () provides one first filter circuit,
Connect first switching circuit, and the outlet side of first filter circuit connects the neutral point；E () provides one second filtered electrical
Road, connects second switching circuit, and the outlet side of second filter circuit connects the neutral point；And (f) provides one and controls
Circuit processed, produces multiple control signal, and first switching circuit and second switching circuit are controlled respectively, defeated to reduce the direct current
Enter the leakage current caused by the parasitic capacitance effect of voltage.
In order to be able to be further understood that the present invention, to reach technology, means and effect that predetermined purpose is taken, is referred to
Below in connection with detailed description of the invention and accompanying drawing, it is believed that the purpose of the present invention, feature and feature, when can thus one deeply and
It is specific to understand, but institute's accompanying drawings are only provided with reference to using with explanation, not for the present invention person of being any limitation as.
Description of the drawings
Fig. 1 is the circuit diagram of prior art dual buck inverter (dual-buck inverter)；
Fig. 2 is the waveform diagram of the drive signal of prior art dual buck inverter；
Fig. 3 is the circuit diagram of solar photovoltaic power converting system of the present invention；
Fig. 4 is the circuit diagram of the control circuit of solar photovoltaic power converting system of the present invention；
Fig. 5 is the waveform diagram of the switch controlling signal of solar photovoltaic power converting system of the present invention；
Fig. 6 is circuit diagram of the solar photovoltaic power converting system of the present invention when being positive half cycle stored energy operation；
It is that positive half cycle releases circuit diagram when can operate that Fig. 7 is solar photovoltaic power converting system of the present invention；
Fig. 8 be solar photovoltaic power converting system of the present invention be negative half period stored energy operation when circuit diagram；
Fig. 9 is that solar photovoltaic power converting system of the present invention releases circuit diagram when can operate for negative half period；And
Figure 10 is the flow chart of solar photovoltaic power converting system method of operating of the present invention.
Wherein, description of reference numerals is as follows：
﹝ Xian You Ji Shu ﹞
Vdc DC input voitages
Vac ac output voltages
The reduction voltage circuits of BC1 first
The reduction voltage circuits of BC2 second
The bridge arms of Lg1a first
The bridge arms of Lg2a second
The bridge arms of Lg3a the 3rd
Lg4a four bridge legs
S1a first switches
S2a second switches
S3a the 3rd is switched
S4a the 4th is switched
The diodes of D1a first
The diodes of D2a second
The diodes of D3a the 3rd
The diodes of D4a the 4th
C1a input capacitances
The control signals of Sca1 first
The control signals of Sca2 second
The control signals of Sca3 the 3rd
The control signals of Sca4 the 4th
Cp1, Cp2 parasitic capacitance
Icp1, Icp2 leakage current
T0, t1, the t2 time
﹝ this Fa Ming ﹞
Vdc DC input voitages
Vac ac output voltages
10 input capacitance groups
101 first electric capacity
102 second electric capacity
11 first switching circuits
The bridge arms of Lg1 first
The bridge arms of Lg2 second
The power switch of S1 first
The diodes of D1 first
The power switch of S2 second
The diodes of D2 second
12 second switching circuits
The bridge arms of Lg3 the 3rd
Lg4 four bridge legs
The power switch of S3 the 3rd
The diodes of D3 the 3rd
The power switch of S4 the 4th
The diodes of D4 the 4th
21 first filter circuits
The outputting inductances of L1 first
The outputting inductances of L2 second
The output capacitances of C1 first
22 second filter circuits
The outputting inductances of L3 the 3rd
The outputting inductances of L4 the 4th
The output capacitances of C2 second
The control signals of Sc1 first
The control signals of Sc2 second
The control signals of Sc3 the 3rd
The control signals of Sc4 the 4th
30 control circuits
301 first comparing units
302 second comparing units
303 signals reverse units
311 first non-gate cells
312 second non-gate cells
Po neutral points
The positive half cycle tank circuits of Lps
The positive half cycles of Lpr are released can loop
Lns negative half period tank circuits
Lnr negative half periods are released can loop
Sac ac output voltage signals
Sac- Opposed crossing output voltage signals
Stri triangle carrier signals
T0, t1, the t2 time
S10～S60 steps
Icp1, Icp2 leakage current
Specific embodiment
Hereby the technical content and a detailed description for the present invention, coordinate schema to be described as follows：
Refer to the circuit diagram that Fig. 3 is solar photovoltaic power converting system of the present invention.The solar photovoltaic power conversion
System is to change a DC input voitage Vdc into an ac output voltage Vac.The solar photovoltaic power converting system includes one
Input capacitance group 10, one first switching circuit 11, one second switching circuit 12, one first filter circuit 21, one second filtered electrical
The control circuit 30 of road 22 and.The input capacitance group 10 includes one first electric capacity 101 and one second electric capacity 102.This is first electric
Hold 101 and be connected a neutral point Po with second electric capacity 102, and receive DC input voitage Vdc.Wherein first electric capacity
101 are connected to neutral point Po with second electric capacity 102, are distinguished with the cross-pressure for maintaining the electric capacity 102 of the first electric capacity 101 and second
Equal to the half of DC input voitage Vdc.First switching circuit 11 input capacitance group 10 in parallel.First switching circuit
11 include the one first bridge arm Lg1 and one second bridge arm Lg2 in parallel with first bridge arm Lg1.The first bridge arm Lg1 is by one
One power switch S1 connects to be formed with one first diode D1, and the second bridge arm Lg2 is by one second power switch S2 and one second
Diode D2 connects to be formed.Second switching circuit 12 input capacitance group 10 in parallel.Second switching circuit 12 includes one the
A three bridge arm Lg3 and four bridge legs Lg4 in parallel with the 3rd bridge arm Lg3.3rd bridge arm Lg3 is by one the 3rd power switch
S3 connects to be formed with one the 3rd diode D3, and the four bridge legs Lg4 is gone here and there by one the 4th power switch S4 and one the 4th diode D4
Connection is formed.
First filter circuit 21 includes one first outputting inductance L1, one second outputting inductance L2 and one first output electricity
Hold C1.The first ends of first outputting inductance L1 mono- connect the first ends of second outputting inductance L2 mono-, then with first output capacitance
The first ends of C1 mono- connect；The ends of first outputting inductance L1 mono- second connect the first power switch S1 and first diode D1.
The ends of second outputting inductance L2 mono- second connect the second power switch S2 and second diode D2.First output capacitance C1
One second end connects neutral point Po.Second filter circuit 22 includes one the 3rd outputting inductance L3, one the 4th outputting inductance L4
And one second output capacitance C2.The first ends of 3rd outputting inductance L3 mono- connect the first ends of the 4th outputting inductance L4 mono-, then
It is connected with the first end of the second output capacitance C2 mono-；The ends of 3rd outputting inductance L3 mono- second connect the 3rd power switch S3 with
3rd diode D3.The ends of 4th outputting inductance L4 mono- second connect the 4th power switch S4 and the 4th diode D4.
The end of second output capacitance C2 mono- second connects neutral point Po.Wherein ac output voltage Vac is output in first output
Between the first end of electric capacity C1 and the first end of second output capacitance C2.The control circuit 30 produces one first control letter
Number Sc1, one second control signal Sc2, one the 3rd control signal Sc3 and one the 4th control signal Sc4 correspond to respectively control should
First power switch S1, second power switch S2, the 3rd power switch S3 and the 4th power switch S4, to reduce being somebody's turn to do
Leakage current caused by the parasitic capacitance effect of DC input voitage Vdc.As for the behaviour of the solar photovoltaic power converting system
Explain, by there is detailed elaboration hereinafter.
Refer to the circuit diagram of the control circuit that Fig. 4 is solar photovoltaic power converting system of the present invention.The control
Circuit 30 is relatively more single comprising a signals reverse unit 303, one first non-gate cell 311, one second non-gate cell 312, one first
The comparing unit 302 of unit 301 and one second.First comparing unit 301 have an inverting input, a non-inverting input with
And an output end.The non-inverting input receives the ac output voltage signal Sac that ac output voltage Vac is provided,
The inverting input receives a triangle carrier signal Stri.The output end exports first control signal Sc1, and the output end
Connect the first non-gate cell 311 to export second control signal Sc2.Wherein triangle carrier signal Stri is high frequency load
Ripple signal.Second comparing unit 302 has an inverting input, a non-inverting input and an output end.This is noninverting
Input connects the signals reverse unit 303 and receives ac output voltage signal Sac again, and the inverting input receives the triangle
Carrier signal Stri.The output end exports the 3rd control signal Sc3, and the output end connects the second non-gate cell 312
To export the 4th control signal Sc4.
Coordinate the waveform diagram referring to the switch controlling signal that Fig. 5 is solar photovoltaic power converting system of the present invention.
When ac output voltage Vac is positive half cycle (time t0～t1 is interval), first control signal Sc1 is believed with second control
Number Sc2 is a complementary high frequency switching signal pair, and the 3rd control signal Sc3 is a complementary low frequency with the 4th control signal Sc4
Signal pair；When ac output voltage Vac is negative half period (time t1～t2 is interval), first control signal Sc1 and this
Two control signals Sc2 are a complementary low frequency signal pair, and the 3rd control signal Sc3 is one complementary with the 4th control signal Sc4
High frequency switching signal pair.
Specifically, when ac output voltage Vac is positive half cycle, the ac output voltage signal Sac and the triangle
After carrier signal Stri is compared by first comparing unit 301, produced first control signal Sc1 is a pulse bandwidth
Modulating signal (PWM signal), also, second control signal Sc2 produced by the first non-gate cell 311 is also one
Pulse wave width modulation signal, and second control signal Sc2 and first control signal Sc1 are the complementary high frequency switching of level
Signal.That is, when first control signal Sc1 is high level, second control signal Sc2 is low level；Conversely, when first
When control signal Sc1 is low level, second control signal Sc2 is high level.It is worth mentioning, the pulse wave width modulation signal
Switching frequency (switching frequency) is equal to the frequency of triangle carrier signal Stri.Additionally, the 3rd control signal
Sc3 is equal to the low frequency mains frequency of ac output voltage signal Sac with the conversion frequency of the 4th control signal Sc4.
In the same manner, when ac output voltage Vac is negative half period, ac output voltage signal Sac is anti-through the signal
Second compared by this to the Opposed crossing output voltage signal Sac- produced by unit 303 and triangle carrier signal Stri
After unit 302 compares, produced 3rd control signal Sc3 is a pulse wave width modulation signal (PWM signal), also,
The 4th control signal Sc4 produced by the second non-gate cell 312 is also a pulse wave width modulation signal, and the 4th
Control signal Sc4 is the complementary high frequency switching signal of level with the 3rd control signal Sc3.That is, when the 3rd control signal
When Sc3 is high level, the 4th control signal Sc4 is low level；Conversely, when the 3rd control signal Sc3 is low level, this
Four control signals Sc4 are high level.It is worth mentioning, the switching frequency (switching of the pulse wave width modulation signal
Frequency) the frequency equal to triangle carrier signal Stri.Additionally, first control signal Sc1 and second control signal
The conversion frequency of Sc2 is equal to the low frequency mains frequency of ac output voltage signal Sac.
It is circuit diagram of the solar photovoltaic power converting system of the present invention when being positive half cycle stored energy operation to refer to Fig. 6.When
Ac output voltage Vac is that positive half cycle is operated, the first control signal Sc1 high frequency switched conductive first power switch S1,
And when the 4th control signal Sc4 low frequency high level turns on the 4th power switch S4, the first outputting inductance L1 with this
Four outputting inductance L4 are stored energy operation, and now, the positive half cycle tank circuit Lps of the solar photovoltaic power converting system one is sequentially
DC input voitage Vdc, first power switch S1, first outputting inductance L1, ac output voltage Vac, the 4th
Outputting inductance L4, the 4th power switch S4, return DC input voitage Vdc.
Refer to Fig. 7 be solar photovoltaic power converting system of the present invention be that positive half cycle releases circuit diagram when can operate.When
Ac output voltage Vac is the operation of positive half cycle, the first control signal Sc1 high frequency switching cut-off first power switch S1,
And when the 4th control signal Sc4 low frequency high level turns on the 4th power switch S4, the first outputting inductance L1 with this
Four outputting inductance L4 to release and can operate, now, release energy loop Lpr and be sequentially by the positive half cycle of solar photovoltaic power converting system one
First outputting inductance L1, ac output voltage Vac, the 4th outputting inductance L4, the 4th power switch S4, the one or two
Pole pipe D1, returns first outputting inductance L1.
Refer to Fig. 8 be solar photovoltaic power converting system of the present invention be negative half period stored energy operation when circuit diagram.When
Ac output voltage Vac is that negative half period is operated, the power switch S3 of the 3rd control signal Sc3 high frequency switched conductive the 3rd,
And when the second control signal Sc2 low frequency high level turns on second power switch S2, the 3rd outputting inductance L3 with this
Two outputting inductance L2 are stored energy operation, and now, the solar photovoltaic power converting system one negative half period tank circuit Lns is sequentially
DC input voitage Vdc, the 3rd power switch S3, the 3rd outputting inductance L3, ac output voltage Vac, this second
Outputting inductance L2, second power switch S2, return DC input voitage Vdc.
It is that solar photovoltaic power converting system of the present invention releases circuit diagram when can operate for negative half period to refer to Fig. 9.When
Ac output voltage Vac is negative half period operation, and the switching of the 3rd control signal Sc3 high frequency ends the 3rd power switch S3,
And when the second control signal Sc2 low frequency high level turns on second power switch S2, the 3rd outputting inductance L3 with this
Two outputting inductance L2 to release and can operate, now, release energy loop Lnr and be sequentially by the negative half period of solar photovoltaic power converting system one
3rd outputting inductance L3, ac output voltage Vac, second outputting inductance L2, second power switch S2, the three or two
Pole pipe D3, returns the 3rd outputting inductance L3.
Refer to the flow chart that Figure 10 is solar photovoltaic power converting system method of operating of the present invention.The photovoltaic
Power conversion system is to change a DC input voitage into an ac output voltage.The method of operating is comprised the steps of：First,
One input capacitance group is provided, the DC input voitage is received, the input capacitance group includes one first electric capacity and one second electric capacity, should
First electric capacity and the neutral point of second capacitance connection one (S10).Then, there is provided one first switching circuit, input capacitance in parallel
Group, comprising one first bridge arm and one second bridge arm in parallel with first bridge arm.First bridge arm is by one first power switch
Formed with one first Diode series, second bridge arm is formed (S20) by one second power switch and one second Diode series.
Then, there is provided one second switching circuit, in parallel input capacitance group, comprising one the 3rd bridge arm and in parallel with the 3rd bridge arm
One four bridge legs.3rd bridge arm is formed by one the 3rd power switch and one the 3rd Diode series, and the four bridge legs are by one
Four power switch and one the 4th Diode series form (S30).Then, there is provided one first filter circuit, comprising one first output
Inductance, one second outputting inductance and one first output capacitance.The first end of first outputting inductance one connects the second output electricity
Feel a first end, then be connected with the first end of the first output capacitance one, the end of the first outputting inductance one second connects first work(
Rate is switched and first diode, and the end of the second outputting inductance one second connects second power switch and second diode.
The end of first output capacitance one second connects the neutral point (S40).Then, there is provided one second filter circuit, it is defeated comprising one the 3rd
Go out inductance, one the 4th outputting inductance and one second output capacitance.The first end of 3rd outputting inductance one connects the 4th output
The first end of inductance one, then be connected with the first end of the second output capacitance one, the end of the 3rd outputting inductance one second connects the 3rd
Power switch and the 3rd diode, the end of the 4th outputting inductance one second connects the 4th power switch and the four or two pole
Pipe.The end of second output capacitance one second connects the neutral point (S50).Wherein the ac output voltage is output in first output
Between the first end of electric capacity and the first end of second output capacitance.Finally, there is provided a control circuit, produce one first to control
Signal processed, one second control signal, one the 3rd control signal and one the 4th control signal correspond to control first power respectively
Switch, second power switch, the 3rd power switch and the 4th power switch (S60), to reduce the direct current input electricity
Leakage current caused by the parasitic capacitance effect of pressure.
When the ac output voltage is the operation of positive half cycle, the first control signal high frequency switched conductive first power is opened
Close, and the 4th control signal low frequency high level, when turning on four power switch, first outputting inductance is defeated with the 4th
It is stored energy operation to go out inductance, and now, it is defeated that the positive half cycle tank circuit of the solar photovoltaic power converting system one is sequentially the direct current
Enter voltage, first power switch, first outputting inductance, the ac output voltage, the 4th outputting inductance, the 4th power
Switch, returns the DC input voitage.When the ac output voltage is the operation of positive half cycle, the first control signal high frequency switches
End first power switch, and the 4th control signal low frequency high level is when turning on four power switch, this is first defeated
Go out inductance with the 4th outputting inductance to release and can operate, now, the positive half cycle of solar photovoltaic power converting system one is released and can returned
Road be sequentially first outputting inductance, the ac output voltage, the 4th outputting inductance, the 4th power switch, the one or two
Pole pipe, returns first outputting inductance.When the ac output voltage is negative half period operation, the 3rd control signal high frequency switches
Turn on the 3rd power switch, and the second control signal low frequency high level, when turning on second power switch, the 3rd is defeated
It is stored energy operation to go out inductance with second outputting inductance, and now, the negative half period energy storage of solar photovoltaic power converting system one is returned
Road is sequentially the DC input voitage, the 3rd power switch, the 3rd outputting inductance, the ac output voltage, this is second defeated
Go out inductance, second power switch, return the DC input voitage.When the ac output voltage is negative half period operation, this
Three control signal high frequencies switching the 3rd power switch of cut-off, and the second control signal low frequency high level turns on second work(
When rate is switched, with second outputting inductance to release and can operate, now, the solar photovoltaic power conversion is the 3rd outputting inductance
Unified negative half period releases energy loop and is sequentially the 3rd outputting inductance, the ac output voltage, second outputting inductance, second work(
Rate switch, the 3rd diode, return the 3rd outputting inductance.
In sum, the present invention has following feature and advantage：
By first switching circuit 11, second switching circuit 12 and first filter circuit 21, second filtered electrical
Dual buck inverter (dual-buck inverter) framework that road 22 is constituted, there is provided first outputting inductance L1, this
Two outputting inductance L2, the energy storage of the 3rd outputting inductance L3 and the 4th outputting inductance L4 and release can path, and pass through again
First filter circuit 21, second filter circuit 22 are connected with the neutral point Po of input direct-current side, greatly reduce parasitism
The impact of leakage current caused by capacitance voltage.
Only, the above, the detailed description of preferred embodiment only of the present invention and schema, only feature of the invention is simultaneously
This is not limited to, and is not used to limit the present invention, all scopes of the present invention should be defined by following rights, all conjunctions
In the embodiment of the spirit of the present patent application scope of the patent claims change similar with its, scope of the invention should be all contained in
In, any those skilled in the art in the field of the invention, can think easily and change or modification all can cover in this case
Scope of the patent claims.
Claims (20)
1. a kind of solar photovoltaic power converting system, to change a DC input voitage into an ac output voltage；The sun
Energy photo-voltaic power supply converting system is included：
One input capacitance group, comprising one first electric capacity and one second electric capacity, first electric capacity is neutral with second capacitance connection one
Point, and receive the DC input voitage；
One first switching circuit, the in parallel input capacitance group, comprising one first bridge arm and one second bridge arm in parallel, wherein this
One bridge arm is formed by one first power switch with one first Diode series, and second bridge arm is by one second power switch and one
Two Diode series are formed；
One second switching circuit, the in parallel input capacitance group, comprising one the 3rd bridge arm and a four bridge legs in parallel, wherein this
Three bridge arms are formed by one the 3rd power switch and one the 3rd Diode series, and the four bridge legs are by one the 4th power switch and one
Four Diode series are formed；
One first filter circuit, connects first switching circuit, and the outlet side of first filter circuit connects the neutral point；
One second filter circuit, connects second switching circuit, and the outlet side of second filter circuit connects the neutral point；
And
One control circuit, produces one first control signal, one second control signal, one the 3rd control signal and one the 4th control
Signal；
Wherein, when the solar photovoltaic power converting system provides a positive half cycle stored energy operation, the first control signal high frequency
Switched conductive first power switch, and the 4th control signal low frequency high level turns on the 4th power switch；When this too
Positive energy photo-voltaic power supply converting system one positive half cycle of offer is released when can operate, and the first control signal high frequency switching ends first work(
Rate is switched, and the 4th control signal low frequency high level turns on the 4th power switch；When the solar photovoltaic power conversion
When system provides a negative half period stored energy operation, the power switch of the 3rd control signal high frequency switched conductive the 3rd, and this
Two control signal low frequency high level turn on second power switch；When the solar photovoltaic power converting system provides a negative half period
Release when can operate, the 3rd control signal high frequency switching the 3rd power switch of cut-off, and the second control signal low frequency is high
Level turns on second power switch.
2. solar photovoltaic power converting system as claimed in claim 1, wherein first control signal, the second control letter
Number, the 3rd control signal and the 4th control signal correspond to respectively control first power switch, second power switch,
3rd power switch and the 4th power switch.
3. solar photovoltaic power converting system as claimed in claim 2, wherein first filter circuit are defeated comprising one first
Go out inductance, one second outputting inductance and one first output capacitance, one end of first outputting inductance connects the second output electricity
One end of sense, then be connected with one end of first output capacitance, the other end of first outputting inductance connects first power and opens
Close and first diode, the other end of second outputting inductance connects second power switch and second diode, and
The other end of first output capacitance connects the neutral point；Second filter circuit includes one the 3rd outputting inductance, the 4th defeated
Go out inductance and one second output capacitance, one end of the 3rd outputting inductance connects one end of the 4th outputting inductance, then with this
One end connection of the second output capacitance, the other end of the 3rd outputting inductance connects the 3rd power switch and the three or two pole
Pipe, the other end of the 4th outputting inductance connects the 4th power switch and the 4th diode, and second output capacitance
The other end connect the neutral point.
4. solar photovoltaic power converting system as claimed in claim 3, wherein control circuit is included：
One signals reverse unit；
One first non-gate cell；
One second non-gate cell；
One first comparing unit, with an inverting input, a non-inverting input and an output end；The non-inverting input
The ac output voltage signal that the ac output voltage is provided is received, the inverting input receives a triangle carrier signal；
The output end exports first control signal, and the output end connects the first non-gate cell to export the second control letter
Number；Wherein the triangle carrier signal is a high-frequency carrier signal；And
One second comparing unit, with an inverting input, a non-inverting input and an output end；The non-inverting input
Connect the signals reverse unit and receive the ac output voltage signal again, the inverting input receives the triangle carrier signal；Should
Output end exports the 3rd control signal, and the output end connects the second non-gate cell to export the 4th control signal.
5. solar photovoltaic power converting system as claimed in claim 4, wherein when the ac output voltage is positive half cycle,
First control signal is a complementary high frequency switching signal pair, the 3rd control signal and the 4th control with second control signal
Signal processed is a complementary low frequency signal pair；When the ac output voltage be negative half period when, first control signal with this second control
Signal processed is a complementary low frequency signal pair, and the 3rd control signal is a complementary high frequency switching signal with the 4th control signal
It is right.
6. solar photovoltaic power converting system as claimed in claim 4, wherein when the solar photovoltaic power converting system
For positive half cycle stored energy operation when, first outputting inductance and the 4th outputting inductance are stored energy operation, and positive half cycle tank circuit
It is sequentially the DC input voitage, first power switch, first outputting inductance, the ac output voltage, the 4th output
Inductance and the 4th power switch are constituted.
7. solar photovoltaic power converting system as claimed in claim 4, wherein when the solar photovoltaic power converting system
Release for positive half cycle when can operate, with the 4th outputting inductance to release and can operate, and just half cycle releases energy loop to first outputting inductance
It is sequentially first outputting inductance, the ac output voltage, the 4th outputting inductance, the 4th power switch and the one or two
Pole pipe is constituted.
8. solar photovoltaic power converting system as claimed in claim 4, wherein when the solar photovoltaic power converting system
For negative half period stored energy operation when, the 3rd outputting inductance and second outputting inductance are stored energy operation, and negative half period tank circuit
It is sequentially the DC input voitage, the 3rd power switch, the 3rd outputting inductance, the ac output voltage, second output
Inductance and second power switch are constituted.
9. solar photovoltaic power converting system as claimed in claim 4, wherein when the solar photovoltaic power converting system
Release for negative half period when can operate, with second outputting inductance to release and can operate, and negative half period releases energy loop to the 3rd outputting inductance
It is sequentially the 3rd outputting inductance, the ac output voltage, second outputting inductance, second power switch and the three or two
Pole pipe is constituted.
10. solar photovoltaic power converting system as claimed in claim 1, wherein first electric capacity and second capacitance connection
In the neutral point, with the half that the cross-pressure for maintaining first electric capacity and the second electric capacity is respectively equal to the DC input voitage.
11. solar photovoltaic power converting systems as claimed in claim 3, the wherein ac output voltage be output in this first
Between one end of one end of output capacitance and second output capacitance.
A kind of 12. methods of operating of solar photovoltaic power converting system, the solar photovoltaic power converting system is changing one
DC input voitage is an ac output voltage, and the method for operating is comprised the steps of：
A () provides an input capacitance group, receive the DC input voitage, and the input capacitance group includes one first electric capacity and one second
Electric capacity, first electric capacity and the neutral point of the second capacitance connection one；
B () provides one first switching circuit, the input capacitance group in parallel, one first bridge arm comprising parallel connection and one second bridge arm,
Wherein first bridge arm is formed by one first power switch with one first Diode series, and second bridge arm is opened by one second power
Pass is formed with one second Diode series；
C () provides one second switching circuit, the input capacitance group in parallel, one the 3rd bridge arm comprising parallel connection and a four bridge legs,
Wherein the 3rd bridge arm is formed by one the 3rd power switch and one the 3rd Diode series, and the four bridge legs are opened by one the 4th power
Pass is formed with one the 4th Diode series；
D () provides one first filter circuit, connect first switching circuit, and the outlet side connection of first filter circuit should
Neutral point；
E () provides one second filter circuit, connect second switching circuit, and the outlet side connection of second filter circuit should
Neutral point；And
F () provides a control circuit, produce one first control signal, one second control signal, one the 3rd control signal and
4th control signal；
Wherein, when the solar photovoltaic power converting system provides a positive half cycle stored energy operation, the first control signal high frequency
Switched conductive first power switch, and the 4th control signal low frequency high level turns on the 4th power switch；When this too
Positive energy photo-voltaic power supply converting system one positive half cycle of offer is released when can operate, and the first control signal high frequency switching ends first work(
Rate is switched, and the 4th control signal low frequency high level turns on the 4th power switch；When the solar photovoltaic power conversion
When system provides a negative half period stored energy operation, the power switch of the 3rd control signal high frequency switched conductive the 3rd, and this
Two control signal low frequency high level turn on second power switch；When the solar photovoltaic power converting system provides a negative half period
Release when can operate, the 3rd control signal high frequency switching the 3rd power switch of cut-off, and the second control signal low frequency is high
Level turns on second power switch.
13. solar photovoltaic power converting system methods of operating as claimed in claim 12, wherein first control signal, should
Second control signal, the 3rd control signal and the 4th control signal correspond to respectively control first power switch, this
Two power switch, the 3rd power switch and the 4th power switch.
14. solar photovoltaic power converting system methods of operating as claimed in claim 13, wherein the first filter circuit bag
Containing one first outputting inductance, one second outputting inductance and one first output capacitance, one end connection of first outputting inductance should
One end of second outputting inductance, then be connected with one end of first output capacitance, the other end connection of first outputting inductance should
First power switch and first diode, the other end of second outputting inductance connects second power switch and the two or two
Pole pipe, and the other end of first output capacitance connects the neutral point；Second filter circuit comprising one the 3rd outputting inductance,
One the 4th outputting inductance and one second output capacitance, one end of the 3rd outputting inductance connects the one of the 4th outputting inductance
End, then be connected with one end of second output capacitance, the other end of the 3rd outputting inductance connects the 3rd power switch and is somebody's turn to do
3rd diode, the other end of the 4th outputting inductance connects the 4th power switch and the 4th diode, and this second
The other end of output capacitance connects the neutral point.
15. solar photovoltaic power converting system methods of operating as claimed in claim 14, wherein control circuit is included：
One signals reverse unit；
One first non-gate cell；
One second non-gate cell；
One first comparing unit, with an inverting input, a non-inverting input and an output end；The non-inverting input
The ac output voltage signal that the ac output voltage is provided is received, the inverting input receives a triangle carrier signal；
The output end exports first control signal, and the output end connects the first non-gate cell to export the second control letter
Number；Wherein the triangle carrier signal is a high-frequency carrier signal；And
One second comparing unit, with an inverting input, a non-inverting input and an output end；The non-inverting input
Connect the signals reverse unit and receive the ac output voltage signal again, the inverting input receives the triangle carrier signal；Should
Output end exports the 3rd control signal, and the output end connects the second non-gate cell to export the 4th control signal.
16. solar photovoltaic power converting system methods of operating as claimed in claim 15, wherein when the ac output voltage
For positive half cycle when, first control signal and second control signal are a complementary high frequency switching signal pair, the 3rd control letter
Number it is a complementary low frequency signal pair with the 4th control signal；When the ac output voltage is negative half period, the first control letter
Number it is a complementary low frequency signal pair with second control signal, the 3rd control signal is one complementary high with the 4th control signal
Frequency switching signal pair.
17. solar photovoltaic power converting system methods of operating as claimed in claim 15, wherein when the solar photovoltaic
When source converting system is positive half cycle stored energy operation, first outputting inductance is stored energy operation with the 4th outputting inductance, and just half
All tank circuits be sequentially the DC input voitage, first power switch, first outputting inductance, the ac output voltage,
4th outputting inductance and the 4th power switch are constituted.
18. solar photovoltaic power converting system methods of operating as claimed in claim 15, wherein when the solar photovoltaic
Source converting system is released when can operate for positive half cycle, and first outputting inductance is to release and can operate with the 4th outputting inductance, and just half
Release in week can loop be sequentially first outputting inductance, the ac output voltage, the 4th outputting inductance, the 4th power switch with
And first diode is constituted.
19. solar photovoltaic power converting system methods of operating as claimed in claim 15, wherein when the solar photovoltaic
When source converting system is negative half period stored energy operation, the 3rd outputting inductance is stored energy operation with second outputting inductance, and is born partly
All tank circuits be sequentially the DC input voitage, the 3rd power switch, the 3rd outputting inductance, the ac output voltage,
Second outputting inductance and second power switch are constituted.
20. solar photovoltaic power converting system methods of operating as claimed in claim 15, wherein when the solar photovoltaic
Source converting system is released when can operate for negative half period, and the 3rd outputting inductance is to release and can operate with second outputting inductance, and negative half
Release in week can loop be sequentially the 3rd outputting inductance, the ac output voltage, second outputting inductance, second power switch with
And the 3rd diode constituted.
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| CN201310474454.8A CN104578852B (en) | 2013-10-11 | 2013-10-11 | Solar photocell source converting system and operation method thereof |
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| CN104811070B (en) * | 2014-01-29 | 2017-08-04 | 台达电子工业股份有限公司 | Power conversion system and its operating method |
| CN105871239B (en) * | 2016-04-29 | 2019-09-20 | 阳光电源股份有限公司 | A kind of method and inverter inhibiting cascaded multilevel inverter leakage current |
| CN109905050B (en) * | 2019-02-13 | 2021-07-09 | 苏州达方电子有限公司 | Power conversion system and operation method thereof |
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| CN101145740A (en) * | 2007-10-29 | 2008-03-19 | 南京航空航天大学 | Coupling inductance dual-buck full bridge inverter |
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| TW201304383A (en) * | 2011-07-13 | 2013-01-16 | Delta Electronics Inc | DC to AC converter |
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|---|---|---|---|---|
| CN101145740A (en) * | 2007-10-29 | 2008-03-19 | 南京航空航天大学 | Coupling inductance dual-buck full bridge inverter |
| CN101388616A (en) * | 2008-11-03 | 2009-03-18 | 南京航空航天大学 | Double step-down combining inverter |
| CN101388617A (en) * | 2008-11-05 | 2009-03-18 | 南京航空航天大学 | Double step-down bridge type inverter controlling method for single current sensor |
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