CN109194127A - A kind of high-gain is wide to input double quasi- sources Z inverter circuit - Google Patents
A kind of high-gain is wide to input double quasi- sources Z inverter circuit Download PDFInfo
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- CN109194127A CN109194127A CN201811247551.2A CN201811247551A CN109194127A CN 109194127 A CN109194127 A CN 109194127A CN 201811247551 A CN201811247551 A CN 201811247551A CN 109194127 A CN109194127 A CN 109194127A
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- 230000033228 biological regulation Effects 0.000 claims description 2
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- 238000010248 power generation Methods 0.000 description 4
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- 239000004065 semiconductor Substances 0.000 description 3
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of double quasi- sources the Z inverter circuits of the wide input of high-gain, it is characterised in that: including DC power supply, the first quasi- Z source circuit, inverter and the second quasi- Z source circuit；The DC power supply is separately connected the first quasi- Z source circuit and the second quasi- Z source circuit input terminal；Described inverter one end connects the first quasi- Z source circuit, and the other end connects the second quasi- Z circuit.The present invention has device voltage stress small, and device voltage variation is small when input is fluctuated, therefore the working condition particularly suitable for working in the wide input of high-gain.
Description
Technical field
The present invention relates to inverter fields, and in particular to a kind of high-gain is wide to input double quasi- sources Z inverter circuit.
Background technique
Needs for protection environment and constantly showing along with energy crisis, the photovoltaic industry of each major country of the world
It all experienced swift and violent development.Although photovoltaic power generation has had the comparable market share in China, each flourishing state is compared
Family, accounting of the generation of electricity by new energy in China are still extremely limited.And in the distribution of the cost of photovoltaic power generation, inverter cost occupies the
Two.Under this overall background, the high and low energy consumption of efficiency of research and development, safe and reliable inverter are for promoting new-energy grid-connected, pushing China
Photovoltaic industry develops in a healthy way, realizes that the energy cleans tool important in inhibiting.
With increasing for parallel network power generation amount, traditional centralized parallel network power generation voltage and current stress is big, is lost
The disadvantages such as big gradually show.According to correlation study data, grid-connected developing direction is being turned to by centralization distributed.This
The developing direction of photovoltaic DC-to-AC converter is just set to have turned to the booster type of middle power from high-power voltage-dropping type large volume centralization inversion
The Miniature inverter of string type and high boosting, high input current.And existing boosting inverter depends on transformer and boosting more
Ability is limited, and the allowable fluctuation range of input voltage is narrow and can not solve the problems, such as that efficiency is lower when high input power, and by
It is not easy to realize miniaturization there are volume is more huge in transformer.So developing high efficiency, novel inverter tool small in size
It is of great importance.
Summary of the invention
In view of this, solving tradition the purpose of the present invention is to provide a kind of double quasi- sources the Z inverter circuits of the wide input of high-gain
The defect that inverter boost capability is poor, input range is small.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of high-gain is wide to input double quasi- sources Z inverter circuit, including DC power supply, the first quasi- Z source circuit, inverter and the second standard
Z source circuit；The DC power supply is separately connected the first quasi- Z source circuit and the second quasi- Z source circuit input terminal；Described inverter one end
The first quasi- Z source circuit is connected, the other end connects the second quasi- Z circuit.
Further, the described first quasi- Z source circuit includes the first inductance L1, the second inductance L2, the first electrolytic capacitor C1, the
Two electrolytic capacitor C2, first diode D1, the second diode D2 and first switch tube S1；Distinguish one end of the first inductance L1
It is connect with the cathode of the anode of first diode D2 and the second electrolytic capacitor C2, the cathode of first diode D1 is electric with first respectively
The anode of solution capacitor C1 is connect with one end of the second inductance L2, and the other end of the second inductance L2 is respectively with the second electrolytic capacitor C2's
One end connection, the other end of first switch tube S1 and the first electricity of anode, the anode of the second diode D2 and first switch tube S1
Solve the cathode connection of capacitor C1.
Further, the described second quasi- Z source circuit includes third inductance L3, the 4th inductance L4, third electrolytic capacitor C3,
Four electrolytic capacitor C4, third diode D3 and second switch S2；One end of the third inductance L3 respectively with third diode
The anode connection of the cathode of D3 and the 4th electrolytic capacitor C4, the anode of third diode D3 are negative with third electrolytic capacitor C3 respectively
Pole is connected with one end of the 4th inductance L4, and the other end of the 4th inductance L4 is electrolysed with one end of second switch S2 and the 4th respectively
The cathode of capacitor C4 connects, and the other end of second switch S2 is connect with the anode that third is electrolysed electric capacitor C3.
Further, one end of the inverter is connect with the cathode of the second diode D2, the other end difference of inverter
It is connect with the other end of the 4th inductance L4, one end of second switch S2 and the 4th electrolytic capacitor C4 cathode.
Further, the anode of the DC power supply respectively with the other end of the first inductance L1 and third electrolytic capacitor C3
Cathode connection, the cathode of DC power supply is connect with the other end of third inductance L3 and the second electrolytic capacitor C2 cathode respectively, and is connect
Ground.
Further, the DC power supply is photovoltaic battery panel, fuel cell or direct-flow voltage regulation source.
Further, the inverter is single-phase inverter, three-phase inverter, separate inverter unit or gird-connected inverter.
Further, the inductance value for stating the first inductance L1, the second inductance L2, third inductance L4 and the 4th inductance L4 is equal.
The electricity of the first electrolytic capacitor C1, the second electrolytic capacitor C2, third electrolytic capacitor C3 and the 4th electrolytic capacitor C4
Capacitance is equal.
Compared with the prior art, the invention has the following beneficial effects:
1, the present invention under the conditions of needing work in high-gain when, compared with existing inverter topology, identical input voltage,
Voltage in the case where output voltage and load, on the electrolytic capacitor of the inverter, semiconductor is lower than most inverter,
Therefore the inverter is suitble to work under the conditions of high-gain.
2, the present invention is keeping output voltage stabilization, when input voltage has larger range fluctuation, the electrolysis of the inverter
Voltage stress on capacitor, diode and switching tube varies less, therefore the inverter is suitble to work under wide input condition.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of double quasi- Z-source inverters of the invention；
Fig. 2 is equivalent circuit structure figure of the present invention under pass-through state；
Fig. 3 is equivalent circuit structure figure of the present invention under non-pass-through state.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is please referred to, the present invention provides a kind of wide input of high-gain the double quasi- sources Z inverter circuits, including sequentially connected straight
Galvanic electricity source, the first quasi- Z source circuit, inverter and the second quasi- Z source circuit；The first quasi- Z source circuit includes the first inductance L1, the
Two inductance L2, the first electrolytic capacitor C1, the second electrolytic capacitor C2, first diode D1, the second diode D2 and first switch tube
S1；One end of the first inductance L1 is connect with the cathode of the anode of first diode D2 and the second electrolytic capacitor C2 respectively, the
The cathode of one diode D1 is connect with the anode of the first electrolytic capacitor C1 with one end of the second inductance L2 respectively, the second inductance L2's
The other end connect with one end of the anode of the second electrolytic capacitor C2, the anode of the second diode D2 and first switch tube S1 respectively,
The other end of first switch tube S1 is connect with the cathode of the first electrolytic capacitor C1；The second quasi- Z source circuit includes third inductance
L3, the 4th inductance L4, third electrolytic capacitor C3, the 4th electrolytic capacitor C4, third diode D3 and second switch S2；Described
One end of three inductance L3 connect with the anode of the cathode of third diode D3 and the 4th electrolytic capacitor C4 respectively, third diode D3
Anode connect respectively with one end of the cathode of third electrolytic capacitor C3 and the 4th inductance L4, the other end of the 4th inductance L4 is distinguished
It is connect with the cathode of one end of second switch S2 and the 4th electrolytic capacitor C4, the other end and third of second switch S2 is electrolysed
The anode connection of capacitor C3.One end of the inverter is connect with the cathode of the second diode D2, the other end point of inverter
It is not connect with the other end of the 4th inductance L4, one end of second switch S2 and the 4th electrolytic capacitor C4 cathode.The direct current
The anode in source is connect with the cathode of the other end of the first inductance L1 and third electrolytic capacitor C3 respectively, the cathode difference of DC power supply
It connect, and is grounded with the other end of third inductance L3 and the second electrolytic capacitor C2 cathode.
Wherein four inductance L1、L2、L3、L4Inductance value be equal, four electrolytic capacitor C1、C2、C3、C4Capacitance
Be it is equal, i.e., impedance network have symmetry.
In order to allow those skilled in the art to better understand technical solution of the present invention, the present invention is carried out below in conjunction with attached drawing
It is discussed in detail.
As shown in Fig. 2, working as the metal-oxide-semiconductor S of the inverter1With metal-oxide-semiconductor S2When simultaneously turning on, diode D1、D2、D3In pass
Disconnected state, double quasi- Z-source inverters described at this time are in pass-through state.
Assuming that inverter switch device switch periods are T, the pass-through state time is Ta, and TaWhen/T=D, D are straight-through
Between account for the percentage of entire switch periods.According to equivalent circuit diagram, by symmetry it can be concluded that circuit equation at this time is as follows:
VL1= Vs+VC2(1)
VL2= VC1(2)
VL3=Vs+VC4(3)
VL4=VC3(4)
In formula, V represents each component voltage, VL1Indicate inductance L1Both end voltage,VL2Indicate inductance L2Both end voltage, VL3Indicate electricity
Feel L3Both end voltage, VL4Indicate inductance L4Both end voltage, VC1Indicate electrolytic capacitor C1Both end voltage, VC2Indicate electrolytic capacitor C2Two
Hold voltage, VC3Indicate electrolytic capacitor C3Both end voltage, VC4Indicate electrolytic capacitor C4Both end voltage, VSIndicate DC power supply both ends electricity
Pressure.
As shown in figure 3, when inverter works normally, diode D1, D2, D3It is in the conductive state, double quasi- Z described at this time
Source inventer is in non-pass-through state.
Inverter works in non-pass-through state, and inverter is equivalent to voltage source V at this timePN, according to equivalent circuit diagram, by symmetrical
The available following circuit equation of property:
VL1=Vs-VC1(5)
VL2=-VC2(6)
VL3=Vs-VC3(7)
VL4=-VC4(8)
VPN=VC1+VC2-VS+VC3+VC4(9)
In formula, V represents each component voltage, VL1Indicate inductance L1Both end voltage,VL2Indicate inductance L2Both end voltage, VL3Indicate electricity
Feel L3Both end voltage, VL4Indicate inductance L4Both end voltage, VC1Indicate electrolytic capacitor C1Both end voltage, VC2Indicate electrolytic capacitor C2Two
Hold voltage, VC3Indicate electrolytic capacitor C3Both end voltage, VC4Indicate electrolytic capacitor C4Both end voltage, VSIndicate DC power supply both ends electricity
Pressure, VPNIndicate the supply voltage relative to inverter.
According to formula (1)-formula (9) and the voltage-second balance principle by inductance in a switch periods, i.e. inductance both ends
Integral of the voltage in a switch periods be zero characteristic, can release such as following formula:
(10)
From formula (10) as can be seen that as straight-through duty ratio D < 0.5, it is added in the voltage V at inverter both endsPNWith DC voltage VS
Inversely proportional relationship greatly realizes the boost function of DC voltage, then matching with the index of modulation of inverter can
To realize that exchange exports the buck of theoretic any multiple.
The amplitude of theoretical maximum ac output voltage is
(11)
By known to 11 formulas, when D approach 0.5, boosting multiple approach it is infinite.But many inverters can theoretically reach
The buck of any multiple, the boost capability for restricting inverter reach the voltage endurance capability and lead to that infinite objective condition is device
Current capacity can specifically be refined as the proof voltage ability of capacitor and the withstanding current capability of inductance.
According to formula (1)-formula (11) and the voltage-second balance principle by inductance in a switch periods, can derive
(12)
It can be seen that, when d approaches 0.5, i.e. boost capability approach is infinite, capacitance voltage value is the half of output voltage, it was demonstrated that
The inverter has the advantages that described.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (9)
1. a kind of high-gain is wide to input double quasi- sources Z inverter circuits, it is characterised in that: including DC power supply, the first quasi- Z source circuit,
Inverter and the second quasi- Z source circuit；The DC power supply is separately connected the first quasi- Z source circuit and the second quasi- Z source circuit input terminal；
Described inverter one end connects the first quasi- Z source circuit, and the other end connects the second quasi- Z circuit.
2. a kind of high-gain according to claim 1 is wide to input double quasi- sources Z inverter circuit, it is characterised in that: described first
Quasi- Z source circuit includes the first inductance L1, the second inductance L2, the first electrolytic capacitor C1, the second electrolytic capacitor C2, first diode
D1, the second diode D2 and first switch tube S1；One end of the first inductance L1 respectively with first diode D2 anode and
The cathode of second electrolytic capacitor C2 connects, and the cathode of first diode D1 is electric with the anode of the first electrolytic capacitor C1 and second respectively
Feel L2 one end connection, the other end of the second inductance L2 respectively with the anode of the second electrolytic capacitor C2, the second diode D2 just
The other end of pole and the connection of one end of first switch tube S1, first switch tube S1 is connect with the cathode of the first electrolytic capacitor C1.
3. a kind of high-gain according to claim 2 is wide to input double quasi- sources Z inverter circuit, it is characterised in that: described second
Quasi- Z source circuit includes third inductance L3, the 4th inductance L4, third electrolytic capacitor C3, the 4th electrolytic capacitor C4, third diode D3
With second switch S2；One end of the third inductance L3 respectively with the cathode of third diode D3 and the 4th electrolytic capacitor C4
Anode connection, the positive of third diode D3 connect with one end of the cathode of third electrolytic capacitor C3 and the 4th inductance L4 respectively,
The other end of 4th inductance L4 is connect with the cathode of one end of second switch S2 and the 4th electrolytic capacitor C4 respectively, second switch
The other end of pipe S2 is connect with the anode that third is electrolysed electric capacitor C3.
4. a kind of high-gain according to claim 3 is wide to input double quasi- sources Z inverter circuit, it is characterised in that: the inversion
One end of device is connect with the cathode of the second diode D2, the other end of inverter respectively with the other end of the 4th inductance L4, second
One end of switching tube S2 is connected with the 4th electrolytic capacitor C4 cathode.
5. a kind of high-gain according to claim 3 is wide to input double quasi- sources Z inverter circuit, it is characterised in that: the direct current
The anode of power supply is connect with the cathode of the other end of the first inductance L1 and third electrolytic capacitor C3 respectively, the cathode point of DC power supply
It does not connect, and is grounded with the other end of third inductance L3 and the second electrolytic capacitor C2 cathode.
6. a kind of high-gain according to claim 1 is wide to input double quasi- sources Z inverter circuit, it is characterised in that: the direct current
Power supply is photovoltaic battery panel, fuel cell or direct-flow voltage regulation source.
7. a kind of high-gain according to claim 1 is wide to input double quasi- sources Z inverter circuit, it is characterised in that: the inversion
Device is single-phase inverter, three-phase inverter, separate inverter unit or gird-connected inverter.
8. a kind of high-gain according to claim 1 is wide to input double quasi- sources Z inverter circuit, it is characterised in that: state the first electricity
The inductance value for feeling L1, the second inductance L2, third inductance L4 and the 4th inductance L4 is equal.
9. a kind of high-gain according to claim 1 is wide to input double quasi- sources Z inverter circuit, it is characterised in that: described first
Electrolytic capacitor C1, the second electrolytic capacitor C2, the capacitance of third electrolytic capacitor C3 and the 4th electrolytic capacitor C4 are equal.
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| CN201811247551.2A CN109194127B (en) | 2018-10-25 | 2018-10-25 | High-gain wide-input double-quasi Z-source inverter circuit |
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| CN201811247551.2A CN109194127B (en) | 2018-10-25 | 2018-10-25 | High-gain wide-input double-quasi Z-source inverter circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030450A (en) * | 2019-12-23 | 2020-04-17 | 西安理工大学 | Buck-boost non-isolated three-port direct current converter |
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