CN105490530A - Quasi Z source converter employing switched inductor and voltage lifting technique - Google Patents

Quasi Z source converter employing switched inductor and voltage lifting technique Download PDF

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Publication number
CN105490530A
CN105490530A CN201511010663.2A CN201511010663A CN105490530A CN 105490530 A CN105490530 A CN 105490530A CN 201511010663 A CN201511010663 A CN 201511010663A CN 105490530 A CN105490530 A CN 105490530A
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China
Prior art keywords
diode
inductance
electric capacity
voltage
negative electrode
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CN201511010663.2A
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Chinese (zh)
Inventor
张波
沈瀚云
罗安
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South China University of Technology SCUT
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South China University of Technology SCUT
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Priority to CN201511010663.2A priority Critical patent/CN105490530A/en
Publication of CN105490530A publication Critical patent/CN105490530A/en
Pending legal-status Critical Current

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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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a quasi Z source converter employing a switched inductor and a voltage lifting technique. The converter comprises a direct current input power supply V<in>, a first diode (D<1>), a first inductor (L<1>), a second diode (D<2>), a second inductor (L<2>), a third diode (D<3>), a second capacitor (C<2>), a fourth diode (D<4>), a first capacitor (C<1>), a fourth diode (D<5>), a third capacitor (C<3>), a third inductor (L<3>), a fourth inductor (L<4>), a sixth diode (D<6>), a switch tube (S), a seventh diode (D<7>), an output capacitor (C<out>) and a load. Compared with a Boost converter, a switched inductor-type quasi Z source converter and the like, the quasi Z source converter provided by the invention has a higher voltage gain, and is suitable for the occasion of non-isolating high-gain direct-current voltage conversion.

Description

A kind of accurate Z source converter adopting switched inductors and voltage lift technique
Technical field
The present invention relates to DC/DC converter field, be specifically related to a kind of accurate Z source converter adopting switched inductors and voltage lift technique.
Background technology
In recent years, day by day exhausted along with the fossil energy such as oil, coal, countries in the world all at the novel renewable and clean energy resource of Devoting Major Efforts To Developing, as solar energy, fuel cell and wind energy etc.And renewable energy system needs the DC power converter with stronger boost capability usually, the low-voltage DC obtained from regenerative resource (18 ~ 50V) is converted to sufficiently high direct voltage (200 ~ 400V), and then carries out inversion to generate electricity by way of merging two or more grid systems.But many boosting DC/DC converters are subject to the restriction of parasitic parameter, heat-dissipating and loss, cannot realize significantly boosting, as Boost, its voltage gain is 1/ (1-D), D is duty ratio, but due to the impact of parasitic parameter, its gain is restricted; The and for example accurate Z source converter of biswitch inductive type, its voltage gain is (1+D)/(1-3D), and comparatively Boost is greatly improved, but still has the space of lifting.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, propose a kind of accurate Z source converter adopting switched inductors and voltage lift technique.
Direct-current input power supplying V is specifically comprised in circuit of the present invention in, the first diode, the first inductance, the second diode, the second inductance, the 3rd diode, the second electric capacity, the 4th diode, the first electric capacity, the 5th diode, the 3rd electric capacity, the 3rd inductance, the 4th inductance, the 6th diode, switching tube, the 7th diode, output capacitance and load.
The concrete connected mode of circuit of the present invention is: described direct-current input power supplying V inpositive pole be connected with the anode of the first diode and one end of the first inductance.The negative electrode of the first described diode is connected with one end of the negative electrode of the second diode and the second inductance.The anode of the second described diode is connected with the anode of other one end of the first inductance and the 3rd diode.The anode of other one end of the second described inductance and the negative electrode of the 3rd diode, one end of the second electric capacity and the 4th diode is connected.The negative electrode of the 4th described diode is connected with the anode of one end of the first electric capacity, the 5th diode and one end of the 3rd inductance.The negative electrode of the 5th described diode is connected with one end of one end of the 3rd electric capacity and the 4th inductance.Other one end of the 3rd described electric capacity is connected with the anode of other one end of the 3rd inductance and the 6th diode.The anode of the negative electrode of the 6th described diode and other one end of the 4th inductance, other one end of the second electric capacity, the drain electrode of switching tube and the 7th diode is connected.The negative electrode of the 7th described diode is connected with one end of output capacitance and one end of load.Described output capacitance is in parallel with load.Described direct-current input power supplying V inother one end of negative pole and the first electric capacity, the source electrode of switching tube, other one end of output capacitance and load other one end be connected.
Compared with prior art, the advantage that circuit of the present invention has is: compared to traditional Boost, (its output voltage is ) and the accurate Z source converter of biswitch inductive type (its output voltage is ) etc. DC/DC converter, when identical duty ratio and input voltage, have higher output voltage, output voltage is under identical input voltage and output voltage condition, circuit of the present invention only needs less duty ratio just inferior grade voltage can be risen to high-grade voltage, and input and output altogether etc., and therefore circuit of the present invention has application prospect very widely.
Accompanying drawing explanation
Fig. 1 is a kind of accurate Z source converter structure chart adopting switched inductors and voltage lift technique.
Fig. 2 is the voltage and current waveform of a switch periods main element.
Fig. 3 a, Fig. 3 b are circuit modal graph in a switch periods.
Fig. 4 is the gain V of circuit, Boost and the accurate Z source converter of biswitch inductive type proposed out/ V inwith the oscillogram of duty ratio D change.
Embodiment
Illustrate for below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.If it is noted that following process or the parameter having special detailed description, be all that those skilled in the art can refer to prior art understanding or realize.
Basic Topological of the present invention and each main element electric current and voltage reference direction are as shown in Figure 1.In order to easy to verify, the device in circuit structure is all considered as ideal component.The drive singal v of switching tube S gS, the first diode D 1current i d1, the second diode D 2current i d2, the 3rd diode D 3current i d3, the 4th diode D 4current i d4, the 5th diode D 5current i d5, the 6th diode D 6current i d6, the 7th diode D 7current i d7, the first inductance L 1current i l1, the second inductance L 2current i l2, the 3rd inductance L 3current i l3, the 4th inductance L 4current i l4, the first electric capacity C 1voltage V c1, the second electric capacity C 2voltage V c2, the 3rd electric capacity C 3voltage V c3oscillogram as shown in Figure 2.
At t 0~ t 1stage, converter this stage modal graph as shown in Figure 3 a, the drive singal v of switching tube S gShigh level is become, switching tube S conducting, the first diode D from low level 1, the 3rd diode D 3, the 5th diode D 5with the 6th diode D 6bear forward voltage conducting, the second diode D 2, the 4th diode D 4with the 7th diode D 7bear reverse voltage cut-off.Direct-current input power supplying V inwith the second electric capacity C 2by the first diode D 1give the second inductance L with switching tube S simultaneously 2charging, direct-current input power supplying V inwith the second electric capacity C 2by the 3rd diode D 3give the first inductance L with switching tube S simultaneously 1charging, the first electric capacity C 1by the 5th diode D 5the 4th inductance L is given with switching tube S 4charging, the first electric capacity C 1by the 6th diode D 6the 3rd inductance L is given with switching tube S 3charging, the first electric capacity C 1by the 5th diode D 5, the 6th diode D 6the 3rd electric capacity C is given with switching tube S 3charging.In addition, output capacitance C outpowering load.
At t 1~ t 2stage, converter this stage modal graph as shown in Figure 3 b, the drive singal v of switching tube S gSbecome low level from high level, switching tube S turns off, the first diode D 1, the 3rd diode D 3, the 5th diode D 5with the 6th diode D 6bear reverse voltage cut-off, the second diode D 2, the 4th diode D 4with the 7th diode D 7bear forward voltage conducting.Direct-current input power supplying V inwith the first inductance L 1with the second inductance L 2by the second diode D 2, the 4th diode D 4with the 7th diode D 7give the first electric capacity C simultaneously 1, the second electric capacity C 2, output capacitance C outwith load charging, the 3rd inductance L 3, the 4th inductance L 4with the 3rd electric capacity C 3by the 4th diode D 4with the 7th diode D 7give the first electric capacity C simultaneously 1, the second electric capacity C 2, output capacitance C outcharge with load.In addition, direct-current input power supplying V in, the first inductance L 1, the second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4with the 3rd electric capacity C 3by the second diode D 2, the 4th diode D 4with the 7th diode D 7give output capacitance C simultaneously outand load supplying.
The steady-state gain of circuit of the present invention is derived as follows.
Due to the first inductance L 1with the second inductance L 2inductance value equal, the 3rd inductance L 3with the 4th inductance L 4inductance value equal, then the first inductance L 1with the second inductance L 2voltage, electric current equal, the 3rd inductance L 3with the 4th inductance L 4voltage, electric current equal.
By the first inductance L 1with the second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4the mean value of voltage in a switch periods be zero, can following relationship be obtained.
( V i n + V C 2 ) t o n + V i n - V C 1 2 t o f f = 0 - - - ( 1 )
V C 1 t o n + V C 1 - V C 2 2 t o f f = 0 - - - ( 2 )
Again when switching tube (S) turns off, output voltage V outmeet following relationship.
V out＝V C1+V C2(3)
Simultaneous solution formula (1), (2), (3) can obtain output voltage V outwith DC input voitage V inrelation.
V o u t = 2 + 2 D 1 - 4 D - D 2 V i n - - - ( 4 )
The steady-state gain of traditional B oost converter and the accurate Z source converter of biswitch inductive type is respectively 1/ (1-D) and (1+D)/(1-3D) (D is duty ratio), the present invention carry circuit and Boost, the accurate Z source converter of switched inductors type steady-state gain comparison diagram as shown in Figure 4, as can be seen from Figure 4, when input voltage is 10V, the circuit that the present invention proposes only needs duty ratio to be 0.2 just can rise to about 150V, and another two kinds of converters then need larger duty ratio.

Claims (2)

1. adopt an accurate Z source converter for switched inductors and voltage lift technique, it is characterized in that comprising direct-current input power supplying, the first diode ( d 1), the first inductance ( l 1), the second diode ( d 2), the second inductance ( l 2), the 3rd diode ( d 3), the second electric capacity ( c 2), the 4th diode ( d 4), the first electric capacity ( c 1), the 5th diode ( d 5), the 3rd electric capacity ( c 3), the 3rd inductance ( l 3), the 4th inductance ( l 4), the 6th diode ( d 6), switching tube ( s), the 7th diode ( d 7), output capacitance ( c out ) and load;
The positive pole of described direct-current input power supplying and the first diode ( d 1) anode and the first inductance ( l 1) one end connect; Described first diode ( d 1) negative electrode and the second diode ( d 2) negative electrode and the second inductance ( l 2) one end connect; Described second diode ( d 2) anode and the first inductance ( l 1) other one end and the 3rd diode ( d 3) anode connect; Described second inductance ( l 2) other one end and the 3rd diode ( d 3) negative electrode, the second electric capacity ( c 2) one end and the 4th diode ( d 4) anode connect; Described 4th diode ( d 4) negative electrode and the first electric capacity ( c 1) one end, the 5th diode ( d 5) anode and the 3rd inductance ( l 3) one end connect; Described 5th diode ( d 5) negative electrode and the 3rd electric capacity ( c 3) one end and the 4th inductance ( l 4) one end connect; Described 3rd electric capacity ( c 3) other one end and the 3rd inductance ( l 3) other one end and the 6th diode ( d 6) anode connect; Described 6th diode ( d 6) negative electrode and the 4th inductance ( l 4) other one end, the second electric capacity ( c 2) other one end, switching tube ( s) drain electrode and the 7th diode ( d 7) anode connect; Described 7th diode ( d 7) negative electrode and output capacitance ( c out ) one end be connected with one end of load; Described output capacitance ( c out ) in parallel with load; Described direct-current input power supplying v in negative pole and the first electric capacity ( c 1) other one end, switching tube ( s) source electrode, output capacitance ( c out ) other one end be connected with other one end of load.
2. a kind of accurate Z source converter adopting switched inductors and voltage lift technique according to claim 1, is characterized in that output voltage v out with DC input voitage v in pass be:
, D is duty ratio.
CN201511010663.2A 2015-12-27 2015-12-27 Quasi Z source converter employing switched inductor and voltage lifting technique Pending CN105490530A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106374740A (en) * 2016-10-19 2017-02-01 成都言行果科技有限公司 Boosting circuit with high heat dissipation
CN107070221A (en) * 2017-04-11 2017-08-18 华南理工大学 A kind of controllable high-gain DC voltage changer of output capacity
CN113572360A (en) * 2021-08-20 2021-10-29 南通大学 Three-port converter with soft switching capability and control method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205336109U (en) * 2015-12-27 2016-06-22 华南理工大学 Adopt switched inductor and voltage lifting technology's accurate Z source converter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205336109U (en) * 2015-12-27 2016-06-22 华南理工大学 Adopt switched inductor and voltage lifting technology's accurate Z source converter

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
杨立强: "阻抗源DC-DC变换器的构造研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 *
王嘉明，等: "改进型开关电感准Z源逆变器", 《电器与能效管理技术》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106374740A (en) * 2016-10-19 2017-02-01 成都言行果科技有限公司 Boosting circuit with high heat dissipation
CN107070221A (en) * 2017-04-11 2017-08-18 华南理工大学 A kind of controllable high-gain DC voltage changer of output capacity
CN113572360A (en) * 2021-08-20 2021-10-29 南通大学 Three-port converter with soft switching capability and control method thereof
CN113572360B (en) * 2021-08-20 2022-05-17 南通大学 Three-port converter with soft switching capability and control method thereof

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Application publication date: 20160413