CN103532413A  Topological structure of switched inductor inverted Lshaped Z source inverter  Google Patents
Topological structure of switched inductor inverted Lshaped Z source inverter Download PDFInfo
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 CN103532413A CN103532413A CN201310437204.7A CN201310437204A CN103532413A CN 103532413 A CN103532413 A CN 103532413A CN 201310437204 A CN201310437204 A CN 201310437204A CN 103532413 A CN103532413 A CN 103532413A
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 inverter
 source
 inductance
 diode
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 230000000694 effects Effects 0.000 abstract description 2
 230000003321 amplification Effects 0.000 abstract 1
 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
 230000001939 inductive effects Effects 0.000 description 14
 238000000034 methods Methods 0.000 description 3
Abstract
The invention discloses a topological structure of a switched inductor inverted Lshaped Z source inverter. The topological structure comprises a direct current power supply and an inverter bridge, and is characterized in that an inverted Lshaped Z source network containing a switched inductor unit is additionally arranged between the direct current power supply and the inverter bridge, i.e., the front end of the inverter bridge is connected with the inverted Lshaped Z source network containing the switched inductor unit. The topological structure has the effects that the capacitor voltage stress in the Z source network is kept to be double of the voltage of the direct current power supply all the time by the inverter during voltage amplification, and the capacitor voltage stress in the conventional Z source inverter is prevented from being increased with the increase in shortthrough duty ratio; compared with the conventional Z source inverter and the switched inductor Z source inverter, the inverter has the advantage that the inductance current stress is reduced under the condition of the same voltage gain, the voltage gain when the shortthrough duty ratio is extremely small is improved, and the influence of impact current on the inverter bridge at the startup of the system can be avoided.
Description
Technical field
The present invention relates to a kind of switched inductors Γ type Zsource inverter topological structure.
Background technology
The topological structure of existing Zsource inverter has multiple, as: traditional Z source inventer as shown in Figure 2, accurate Zsource inverter as shown in Figure 3, switched inductors Zsource inverter as shown in Figure 4 and accurate switched inductors Zsource inverter as shown in Figure 5 etc.From Fig. 2～5, can find out, in above various Zsource inverters, except having inductance, all contain two capacity cells, and the voltage stress of electric capacity increases along with the increase of straightthrough duty ratio.Because capacitance voltage stress range is larger, this will reduce the useful life of electric capacity, and has limited the size of straightthrough duty ratio; While starting, may there is impulse current in system; In addition, in above Zsource inverter, inductive current stress is larger.
Summary of the invention
For above problem, the topological structure that the object of this invention is to provide a kind of switched inductors Γ type Zsource inverter, in the Z source network of this inverter, only contain a capacity cell, and to make capacitance voltage stress be certain value, and reduced inductive current stress under identical voltage gain condition.
For achieving the above object, the technical solution used in the present invention is: a kind of switched inductors Γ type Zsource inverter topological structure, this topological structure includes DC power supply, inverter bridge, it is characterized in that: between described DC power supply and inverter bridge, add a Γ type Z source network that contains switched inductors unit, the front end in inverter bridge connects the Γ type Z source network that contains switched inductors unit.
The described Γ type Z source network that contains switched inductors unit comprises three inductance, an electric capacity and four diodes; If three inductance are respectively 1# inductance L
_{1}, 2# inductance L
_{2}with 3# inductance L
_{3}; Four diodes are respectively 1# diode D
_{1}, 2# diode D
_{2}, 3# diode D
_{3}with 4# diode D
_{4}; An electric capacity is 1# capacitor C;
Described 1# diode D
_{1}anode be connected with the positive pole of DC power supply Vdc, D
_{1}negative electrode respectively with 1# inductance L
_{1}one end, 2# inductance L
_{2}one end and 2# diode D
_{2}anode be connected; 1# inductance L
_{1}the other end be connected with the positive pole of capacitor C, the negative pole of capacitor C is connected with the negative pole of DC power supply Vdc and the lower brachium pontis of inverter bridge; 2# inductance L
_{2}the other end and 3# diode D
_{3}with 4# diode D
_{4}anode be connected; 3# inductance L
_{3}one end and 2# diode D
_{2}negative electrode and 3# diode D
_{3}negative electrode be connected, 3# inductance L
_{3}the other end and 4# diode D
_{4}negative electrode and the upper brachium pontis of inverter bridge be connected.
Described L
_{1}=L
_{2}=L
_{3}=L, L is the inductance value of inductance element in the Γ type Z source network that contains switched inductors unit.
The present invention has following advantage and technique effect:
1. by containing two electric capacity in traditional Z source network, be kept to and only contain an electric capacity, and capacitance voltage stress is certain value in the process of boosting, can extend useful life, the reduction system volume of system and reduce system cost.
2. under identical voltage gain, capacitance voltage stress is certain value, compares and has reduced capacitance voltage stress with other type Zsource inverter.
3. due to the front end of switched inductors unit in inverter bridge, so the impulse current to inverter bridge when this inverter can avoid system to start.
4. under the condition of identical voltage gain, the gain of the inductive current of switched inductors Γ type Zsource inverter is less than traditional Z source inventer and switched inductors Zsource inverter.
Accompanying drawing explanation:
Fig. 1 is inductive type Zsource inverter topological structure of the present invention;
Fig. 2 is traditional Z source inventer;
Fig. 3 Zsource inverter that is as the criterion;
Fig. 4 is switched inductors Zsource inverter;
Fig. 5 is the accurate Zsource inverter of switched inductors;
Fig. 6 be the present invention when passthrough state, switched inductors Γ type Zsource inverter topological structure;
Fig. 7 be the present invention when nonpassthrough state, switched inductors Γ type Z inverter topology;
Fig. 8 is traditional Z source inventer, switched inductors Zsource inverter and switched inductors Γ type Zsource inverter voltage gain correlation curve;
Fig. 9 is traditional Z source inventer, switched inductors Zsource inverter and switched inductors Γ type Zsource inverter capacitance voltage stress correlation curve;
Figure 10 is traditional Z source inventer and switched inductors Γ type Zsource inverter inductive current stress correlation curve;
Figure 11 is switched inductors Zsource inverter and switched inductors Γ type Zsource inverter inductive current stress correlation curve.
Embodiment
By reference to the accompanying drawings inductive type Zsource inverter topological structure of the present invention is illustrated.
In the switched inductors Γ type Z source network of inverter of the present invention, only contain a capacity cell; In the process of boosting, capacitance voltage stress is certain value; Inductive current stress under identical voltage gain condition is less.
As shown in Figure 1: a kind of switched inductors Γ type Zsource inverter topological structure, this topological structure includes DC power supply, inverter bridge.Between described DC power supply and inverter bridge, add a Γ type Z source network that contains switched inductors unit, the front end in inverter bridge connects the Γ type Z source network that contains switched inductors unit.The described Γ type Z source network that contains switched inductors unit comprises three inductance, an electric capacity and four diodes; Wherein, three inductance are respectively 1# inductance L
_{1}, 2# inductance L
_{2}with 3# inductance L
_{3}; Four diodes are respectively 1# diode D
_{1}, 2# diode D
_{2}, 3# diode D
_{3}with 4# diode D
_{4}; An electric capacity is 1# capacitor C;
Described 1# diode D
_{1}anode be connected with the positive pole of DC power supply Vdc, D
_{1}negative electrode respectively with 1# inductance L
_{1}one end, 2# inductance L
_{2}one end and 2# diode D
_{2}anode be connected; 1# inductance L
_{1}the other end be connected with the positive pole of capacitor C, the negative pole of capacitor C is connected with the negative pole of DC power supply Vdc and the lower brachium pontis of inverter bridge; 2# inductance L
_{2}the other end and 3# diode D
_{3}with 4# diode D
_{4}anode be connected; 3# inductance L
_{3}one end and 2# diode D
_{2}negative electrode and 3# diode D
_{3}negative electrode be connected, 3# inductance L
_{3}the other end and 4# diode D
_{4}negative electrode and the upper brachium pontis of inverter bridge be connected.
Described L
_{1}=L
_{2}=L
_{3}=L, L is the inductance value of inductance element in the Γ type Z source network that contains switched inductors unit.
As shown in Figure 6: when working in passthrough state, 1#, 2# and 4# diode D in Γ type Z source network
_{1}, D
_{2}and D
_{4}conducting, 3# diode D
_{3}cutoff, wherein 2# and 3# inductance L
_{2}and L
_{3}be and be connected in parallel, now inductance stored energy;
As shown in Figure 7: when working in nonpassthrough state, 1#, 2# and 4# diode D in Γ type Z source network
_{1}, D
_{2}and D
_{4}cutoff, 3# diode D
_{3}conducting, wherein 2# and 3# inductance L
_{2}and L
_{3}be and be connected in series, now inductance releases energy to load, and the voltage gain of this Zsource inverter is:
Wherein: B is voltage gain; D is straightthrough duty ratio.
In this Zsource inverter, average inductor current is:
Wherein: L is the inductance value of inductance element in Z source network; L
_{l}for load inductance; R
_{l}for load resistance; V
_{dc}for DC power supply voltage.
Load average electric current is:
When load is pure when resistive, inductive current stress is:
The voltage gain correlation curve of switched inductors Γ type Zsource inverter, traditional Z source inventer and switched inductors Zsource inverter as shown in Figure 8, known in figure, when little straightthrough duty ratio, the voltage gain of switched inductors Γ type Zsource inverter is larger.
The capacitance voltage stress correlation curve of switched inductors Γ type Zsource inverter, traditional Z source inventer and switched inductors Zsource inverter as shown in Figure 9.Visible, the capacitance voltage stress of switched inductors Γ type Zsource inverter does not change with the variation of straightthrough duty ratio, and the capacitance voltage stress range of other two kinds of Zsource inverters is larger.Wherein: SLZSI is switched inductors type Zsource inverter; Trad.ZSI is traditional Z source inventer.
Inductive current stress correlation curve in switched inductors Γ type Zsource inverter as shown in figure 10 and traditional Z source inventer, inductive current stress correlation curve in the switched inductors Γ type Zsource inverter shown in Figure 11 and switched inductors Zsource inverter and traditional Z source inventer.
From Fig. 8,10 and 11, can find out, in switched inductors Γ type Zsource inverter, inductive current STRESS VARIATION is less, and under identical voltage gain condition, its inductive current stress is less than the inductive current stress in traditional Z source inventer and switched inductors Zsource inverter.
Claims (3)
1. a switched inductors Γ type Zsource inverter topological structure, this topological structure includes DC power supply, inverter bridge, it is characterized in that: between described DC power supply and inverter bridge, add a Γ type Z source network that contains switched inductors unit, the front end in inverter bridge connects the Γ type Z source network that contains switched inductors unit.
2. switched inductors Γ type Zsource inverter topological structure according to claim 1, is characterized in that: described in contain switched inductors unit Γ type Z source network comprise three inductance, an electric capacity and four diodes; If three inductance are respectively 1# inductance L
_{1}, 2# inductance L
_{2}with 3# inductance L
_{3}; Four diodes are respectively 1# diode D
_{1}, 2# diode D
_{2}, 3# diode D
_{3}with 4# diode D
_{4}; An electric capacity is 1# capacitor C;
Described 1# diode D
_{1}anode be connected with the positive pole of DC power supply Vdc, D
_{1}negative electrode respectively with 1# inductance L
_{1}one end, 2# inductance L
_{2}one end and 2# diode D
_{2}anode be connected; 1# inductance L
_{1}the other end be connected with the positive pole of capacitor C, the negative pole of capacitor C is connected with the negative pole of DC power supply Vdc and the lower brachium pontis of inverter bridge; 2# inductance L
_{2}the other end and 3# diode D
_{3}with 4# diode D
_{4}anode be connected; 3# inductance L
_{3}one end and 2# diode D
_{2}negative electrode and 3# diode D
_{3}negative electrode be connected, 3# inductance L
_{3}the other end and 4# diode D
_{4}negative electrode and the upper brachium pontis of inverter bridge be connected.
3. switched inductors Γ type Zsource inverter topological structure according to claim 2, is characterized in that: described L
_{1}=L
_{2}=L
_{3}=L, L is the inductance value of inductance element in the Γ type Z source network that contains switched inductors unit.
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Cited By (3)
Publication number  Priority date  Publication date  Assignee  Title 

CN103997244A (en) *  20140508  20140820  南京铁道职业技术学院  Serialconnected Zsource trilevel inverter and method thereof 
CN105186909A (en) *  20150826  20151223  齐鲁工业大学  Enhanced Zsource inverter and working method thereof 
CN107612404A (en) *  20171009  20180119  哈尔滨工业大学  Γ source inventers and modulator approach based on switching capacity 
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CN102223095A (en) *  20110621  20111019  哈尔滨工业大学（威海）  Highgain Zsource inverter 
CN103326610A (en) *  20130704  20130925  天津城建大学  Topological structure for inductancetype Zsource inverter 
CN203504449U (en) *  20130831  20140326  天津城市建设学院  Switch inductance gammatype Zsource inverter topology structure 
CN103840694A (en) *  20130831  20140604  天津城市建设学院  Topological structure of switch inductance invertedLshaped Zsource inverter 

2013
 20130923 CN CN201310437204.7A patent/CN103532413A/en active Pending
Patent Citations (4)
Publication number  Priority date  Publication date  Assignee  Title 

CN102223095A (en) *  20110621  20111019  哈尔滨工业大学（威海）  Highgain Zsource inverter 
CN103326610A (en) *  20130704  20130925  天津城建大学  Topological structure for inductancetype Zsource inverter 
CN203504449U (en) *  20130831  20140326  天津城市建设学院  Switch inductance gammatype Zsource inverter topology structure 
CN103840694A (en) *  20130831  20140604  天津城市建设学院  Topological structure of switch inductance invertedLshaped Zsource inverter 
Cited By (4)
Publication number  Priority date  Publication date  Assignee  Title 

CN103997244A (en) *  20140508  20140820  南京铁道职业技术学院  Serialconnected Zsource trilevel inverter and method thereof 
CN105186909A (en) *  20150826  20151223  齐鲁工业大学  Enhanced Zsource inverter and working method thereof 
CN107612404A (en) *  20171009  20180119  哈尔滨工业大学  Γ source inventers and modulator approach based on switching capacity 
CN107612404B (en) *  20171009  20190702  哈尔滨工业大学  Γ source inventer and modulator approach based on switching capacity 
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