CN203352432U  Topological structure of induction type Zsource inverter  Google Patents
Topological structure of induction type Zsource inverter Download PDFInfo
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 CN203352432U CN203352432U CN 201320396126 CN201320396126U CN203352432U CN 203352432 U CN203352432 U CN 203352432U CN 201320396126 CN201320396126 CN 201320396126 CN 201320396126 U CN201320396126 U CN 201320396126U CN 203352432 U CN203352432 U CN 203352432U
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 inductance
 diode
 network
 source inverter
 inverter
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Abstract
The utility model provides a topological structure of an induction type Zsource inverter. The topological structure comprises a DC power supply and an inverter bridge. Between the DC power supply and the inverter bridge, just a network formed by inductors and diodes is disposed. The network is provided with n (n>=2) inductors, and 3x(n1) diodes are matched with the inductors, so that the network of the inductors and diodes is formed. In the network, n inductors form (n1) circuit units, and each unit comprises two inductors and three diodes. Effects of the topological structure are that capacity cells which are used as necessary components in a Zsource network of a Zsource inverter are removed, service life of a system is prolonged, volume of the system is reduced, and system cost is reduced. The induction type Zsource inverter prevents resonance phenomenon caused by coexistence of the capacitors and inductors, and prevents impact current exists when the Zsource inverter starts. Under same voltage gain conditions, inductive current stress of the induction type Zsource inverter is lower than that of a conventional Zsource inverter and a switching inductance Zsource inverter.
Description
Technical field
The utility model relates to a kind of inductive 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.Can find out from Fig. 2～5, in above various Zsource inverters, except inductance is arranged, all contain capacity cell.Due to the existence of capacity cell, inevitably have that lifetime of system is shorter, may exist resonance phenomena, system may have impulse current while starting between inductance and electric capacity; In addition, in above Zsource inverter, inductive current stress is larger, and can only change voltage gain by the mode that changes straightthrough duty ratio.
Summary of the invention
For above problem, the purpose of this utility model is to provide a kind of inductive type Zsource inverter topological structure, in the Z source network of this inverter, only contains inductance element, has removed the topological structure that must contain capacity cell in Z source network in the past; Voltage gain can be regulated by quantity and two kinds of modes of straightthrough duty ratio of adjusting inductance element; Inductive current stress under identical voltage gain condition is less.
For achieving the above object, the technical solution adopted in the utility model is to provide a kind of inductive type Zsource inverter topological structure inductive type Zsource inverter topological structure, this topological structure includes DC power supply, inverter bridge, only contains the network that inductance and diode form between described DC power supply and inverter bridge; Be provided with the individual inductance of n (n >=2) in described network, should have 3 * (n1) individual diodes to be complementary, and the inductance and the diode network that form, in described network, n inductance forms n1 circuit unit, and each unit contains two inductance and three diodes; N inductance forms n1 unit altogether; Two inductance are respectively 1# inductance and 2# inductance; Three diodes are respectively 1# diode, 2# diode and 3# diode; For two adjacent cells, the 1# inductance that the 2# inductance of previous element is a rear unit;
In described network, an end of the 1# inductance of any unit is connected with the anode of 1# diode, and the other end of 1# inductance is connected with the anode of 3# diode with 2#; One end of 2# inductance is connected with the negative electrode of 2# diode with 1#, and the other end of 2# inductance is connected with the negative electrode of 3# diode;
When working in passthrough state, any one unit in described network, 1# and 3# diode current flow, 2# diode cutoff, the 1# in each unit and 2# inductance are and are connected in parallel, now the inductance stored energy; When working in nonpassthrough state, any one unit in described network, the cutoff of 1# and 3# diode, the 2# diode current flow, the 1# in each unit and 2# inductance are and are connected in series, and now inductance releases energy to load.
Effect of the present utility model is:
1. removed capacity cell as part necessary in Z source network in Zsource inverter, can extend useful life, the reduction system volume of system and reduce system cost.
2. owing to having removed capacity cell, the inductive type Zsource inverter has been avoided the resonance phenomena that coexists and cause due to electric capacity and inductance.
3. owing to having removed capacity cell, the impulse current that the inductive type Zsource inverter has existed while having avoided Zsource inverter to start.
4. under the condition of identical voltage gain, the inductive current stress of inductive type Zsource inverter is less than traditional Z source inventer and switched inductors Zsource inverter.
The accompanying drawing explanation
Fig. 1 is inductive type Zsource inverter topological structure of the present utility model;
Fig. 2 is the traditional Z source inventer;
Fig. 3 Zsource inverter that is as the criterion;
Fig. 4 is the switched inductors Zsource inverter;
Fig. 5 is the accurate Zsource inverter of switched inductors;
When Fig. 6 is passthrough state of the present utility model, inductive type Zsource inverter topological structure;
When Fig. 7 is nonpassthrough state of the present utility model, inductive type Z inverter topology;
When Fig. 8 is different n value of the present utility model, inductive type Zsource inverter voltage gain curve;
Fig. 9 is dissimilar Zsource inverter of the present utility model and the n inductive type Zsource inverter voltage gain correlation curve while getting different value;
Figure 10 is inductive current stress correlation curve in inductive type Zsource inverter of the present utility model and switched inductors Zsource inverter;
Figure 11 is inductive current stress correlation curve in inductive type Zsource inverter of the present utility model and traditional Z source inventer.
Embodiment
By reference to the accompanying drawings inductive type Zsource inverter topological structure of the present utility model is illustrated.
Only contain inductance element in the Z source network of inverter of the present utility model, removed the topological structure that must contain capacity cell in Z source network in the past; Voltage gain can be regulated by quantity and two kinds of modes of straightthrough duty ratio of adjusting inductance element; Inductive current stress under identical voltage gain condition is less.
Inductive type Zsource inverter topological structure of the present utility model, this topological structure includes DC power supply, inverter bridge, only contains the network that inductance and diode form between described DC power supply and inverter bridge; Be provided with the individual inductance of n (n >=2) in described network, should have 3 * (n1) individual diodes to be complementary, and the inductance and the diode network that form, in described network, n inductance forms n1 circuit unit, and each unit contains two inductance and three diodes; N inductance forms n1 unit altogether; Two inductance are respectively 1# inductance and 2# inductance; Three diodes are respectively 1# diode, 2# diode and 3# diode; For two adjacent cells, the 1# inductance that the 2# inductance of previous element is a rear unit;
In described network, an end of the 1# inductance of any unit is connected with the anode of 1# diode, and the other end of 1# inductance is connected with the anode of 3# diode with 2#; One end of 2# inductance is connected with the negative electrode of 2# diode with 1#, and the other end of 2# inductance is connected with the negative electrode of 3# diode;
When working in passthrough state, any one unit in described network, 1# and 3# diode current flow, 2# diode cutoff, the 1# in each unit and 2# inductance are and are connected in parallel, now the inductance stored energy;
When working in nonpassthrough state, any one unit in described network, the cutoff of 1# and 3# diode, the 2# diode current flow, the 1# in each unit and 2# inductance are and are connected in series, and now inductance releases energy to load.
Described DC power supply (Vdc) is connected between the lower brachium pontis of inductance and diode network and inverter bridge, or is connected between the upper brachium pontis of inductance and diode network and inverter bridge.
As shown in Figure 1, wherein: L
_{1}=L
_{2}=L
_{3}=...=L
_{n1}=L
_{n}=L, the number that n is inductance.Z source network and inverter bridge that the structure of inductive type Zsource inverter is comprised of inductance and diode form.The Z source network be comprised of inductance and diode is comprised of n inductance and 3 * (n1) individual diodes.L wherein
_{1}an end and D
_{1,1}anode be connected, L
_{1}the other end and D
_{1,2}and D
_{1,3}anode be connected.L
_{2}an end and D
_{1,1}and D
_{1,2}negative electrode be connected, with D
_{2,1}anode be connected; L
_{2}the other end and D
_{2,2}and D
_{2,3}anode be connected.By that analogy, known L
_{n1}an end and D
_{n2,1}and D
_{n2,2}negative electrode be connected, with D
_{n1,1}anode be connected; L
_{2}the other end and D
_{n1,2}and D
_{n1,3}anode be connected.L
_{n}an end and D
_{n1,1}and D
_{n1,2}negative electrode be connected, L
_{n}the other end and D
_{n1,3}be connected.In addition, DC power supply Vdc can be placed between the lower brachium pontis of inductance and diode network and inverter bridge, also can be placed between the upper brachium pontis of inductance and diode network and inverter bridge.With diode network, equivalence becomes each inductance in parallel, now inductance stored energy to inductance when straightthrough.
When working in nonpassthrough state, as shown in Figure 7, with diode network, equivalence becomes each inductance series connection to inductance when straightthrough to equivalent electric circuit, and now inductance releases energy to load, and the voltage gain of this Zsource inverter is:
Wherein: the quantity that n is inductance in the Z source network; D is straightthrough duty ratio.
In this Zsource inverter, average inductor current is:
Wherein: the inductance value that L is inductance element in the Z source network; L
_{l}for load inductance; R
_{l}for load resistance; V
_{dc}for DC power supply voltage.
And in inductance network, each inductive current all equates, in this Zsource inverter, the load average electric current is:
When load is pure when resistive, inductive current stress and load average electric current are respectively:
Inductive type Zsource inverter voltage gain curve when the n shown in Fig. 8 gets different value, known in figure, the voltage gain that this inverter can be adjusted inverter by adjusting the number that contains inductance in the Z source network and two kinds of modes of straightthrough duty ratio; With other type Zsource inverter, compare, the mode of this inverter regulation voltage gain is more diversified.
Inductive type Zsource inverter voltage gain correlation curve when the dissimilar Zsource inverter shown in Fig. 9 and n get different value.The inductive type Zsource inverter can carry out the regulation voltage gain by the quantity of adjusting inductance as we know from the figure, can make this gain be better than the Zsource inverter of other type in certain interval, be suitable for when straightthrough change in duty cycle scope than hour situation; In addition, the voltage gain of inductive type Zsource inverter changes steadily than other type Zsource inverter, makes like this its control more convenient.Wherein: SLZSI is switched inductors type Zsource inverter; Trad.ZSI is the traditional Z source inventer.
During the different n value of Fig. 9, inductive type Zsource inverter and other Zsource inverter voltage gain correlation curve, inductive current stress correlation curve in Figure 10 inductive type Zsource inverter and switched inductors Zsource inverter, inductive current stress correlation curve in Figure 11 inductive type Zsource inverter and traditional Z source inventer.
From Figure 10 and 11, can find out, in the inductive type Zsource inverter, the inductive current STRESS VARIATION is less of n=1, and 2,3,4,5,6, and during D ∈ [0,0.3], inductive current stress changes between 1～3.6; And the current stress excursion of traditional Z inverter and switched inductors Zsource inverter is (1～+ ∞).And, when identical voltage gain, the current stress of LZSI is lower than the current stress of traditional Z SI and SLZSI.
Table 1 and table 2 have provided under identical voltage gain condition, the contrast of inductive current stress in inductive type Zsource inverter, traditional Z source inventer and switched inductors Zsource inverter (load is pure resistive).
In table 1 inductive type Zsource inverter and switched inductors Zsource inverter, the inductive current stress ratio
In table 2 inductive type Zsource inverter and traditional Z source inventer, the inductive current stress ratio
Claims (2)
1. an inductive type Zsource inverter topological structure, this topological structure includes DC power supply, inverter bridge, it is characterized in that: only contain the network that inductance and diode form between described DC power supply and inverter bridge; Be provided with the individual inductance of n (n >=2) in described network, should have 3 * (n1) individual diodes to be complementary, and the inductance and the diode network that form, in described network, n inductance forms n1 circuit unit, and each unit contains two inductance and three diodes; N inductance forms n1 unit altogether; Two inductance are respectively 1# inductance and 2# inductance; Three diodes are respectively 1# diode, 2# diode and 3# diode; For two adjacent cells, the 1# inductance that the 2# inductance of previous element is a rear unit;
In described network, an end of the 1# inductance of any unit is connected with the anode of 1# diode, and the other end of 1# inductance is connected with the anode of 3# diode with the 2# diode; One end of 2# inductance is connected with the negative electrode of 2# diode with the 1# diode, and the other end of 2# inductance is connected with the negative electrode of 3# diode;
When working in passthrough state, any one unit in described network, 1# diode and 3# diode current flow, 2# diode cutoff, the 1# inductance in each unit and 2# inductance are and are connected in parallel, now the inductance stored energy;
When working in nonpassthrough state, any one unit in described network, the cutoff of 1# diode and 3# diode, the 2# diode current flow, the 1# inductance in each unit and 2# inductance are and are connected in series, and now inductance releases energy to load.
2. inductive type Zsource inverter topological structure according to claim 1, it is characterized in that: described DC power supply (Vdc) is connected between the lower brachium pontis of inductance and diode network and inverter bridge, or is connected between the upper brachium pontis of inductance and diode network and inverter bridge.
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Cited By (3)
Publication number  Priority date  Publication date  Assignee  Title 

CN103326610A (en) *  20130704  20130925  天津城建大学  Topological structure for inductancetype Zsource inverter 
CN103825457A (en) *  20140224  20140528  华南理工大学  QuasiZsource DCDC boost converter circuit 
CN111786452A (en) *  20200710  20201016  中车株洲电力机车研究所有限公司  Subway optical storage system and control method thereof 

2013
 20130704 CN CN 201320396126 patent/CN203352432U/en not_active Expired  Fee Related
Cited By (3)
Publication number  Priority date  Publication date  Assignee  Title 

CN103326610A (en) *  20130704  20130925  天津城建大学  Topological structure for inductancetype Zsource inverter 
CN103825457A (en) *  20140224  20140528  华南理工大学  QuasiZsource DCDC boost converter circuit 
CN111786452A (en) *  20200710  20201016  中车株洲电力机车研究所有限公司  Subway optical storage system and control method thereof 
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