CN106972751B - Double-tube Z-source direct-current voltage converter - Google Patents

Double-tube Z-source direct-current voltage converter Download PDF

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Publication number
CN106972751B
CN106972751B CN201710231519.4A CN201710231519A CN106972751B CN 106972751 B CN106972751 B CN 106972751B CN 201710231519 A CN201710231519 A CN 201710231519A CN 106972751 B CN106972751 B CN 106972751B
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diode
inductor
source
tube
switch tube
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CN106972751A (en
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陈艳峰
陈柱
张波
丘东元
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South China University of Technology SCUT
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South China University of Technology SCUT
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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

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

Abstract

The invention discloses a double-tube Z-source direct-current voltage converter which comprises a voltage source, an inductor, a capacitor, a first switch tube, a second switch tube, a first diode, a second diode and a load, wherein the voltage source is connected with the inductor; the positive electrode of the voltage source is connected with one end of the inductor, and the negative electrode of the voltage source is respectively connected with the source electrode of the first switch tube and the cathode of the first diode; the drain electrode of the first switching tube is respectively connected with the cathode of the second diode, the anode of the capacitor and one end of the load; the drain electrode of the second switching tube is respectively connected with the anode of the second diode and the other end of the inductor; and the source electrode of the second switch tube is respectively connected with the anode of the first diode, the cathode of the capacitor and the other end of the load. The invention has simple structure, convenient control mode, continuous input current, and can realize higher output voltage gain at low duty ratio without starting impact problem.

Description

Double-tube Z-source direct-current voltage converter
Technical Field
the invention relates to the technical field of power electronic converters, in particular to a double-tube Z-source direct-current voltage converter.
background
With the rapid development of industrial production, high-power and high-gain converters play an increasingly important role in occasions requiring electric energy conversion. In recent years, the Z-source converter achieves larger output voltage at low duty ratio, and overcomes the defects of overlarge peak current of a switching tube and a diode and the like of a Boost converter caused by limit duty ratio. However, the input current of the conventional Z-source converter is discontinuous, which is not favorable for input-side filtering, and meanwhile, the Z-source converter adopts two capacitors and two inductors, which are not favorable for reducing the volume of the system and improving the power density of the system.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provides a double-tube Z-source direct-current voltage converter which is suitable for a power electronic circuit needing high gain and non-isolation.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a double-tube Z-source direct-current voltage converter comprises a voltage source, an inductor, a capacitor, a first switch tube, a second switch tube, a first diode, a second diode and a load; the positive electrode of the voltage source is connected with one end of the inductor, and the negative electrode of the voltage source is respectively connected with the source electrode of the first switch tube and the cathode of the first diode; the drain electrode of the first switching tube is respectively connected with the cathode of the second diode, the anode of the capacitor and one end of the load; the drain electrode of the second switching tube is respectively connected with the anode of the second diode and the other end of the inductor; and the source electrode of the second switch tube is respectively connected with the anode of the first diode, the cathode of the capacitor and the other end of the load.
The voltage source and the inductor are connected in series in sequence to form a branch circuit, and the positions of the voltage source and the inductor can be exchanged in the same branch circuit, but the current flow direction is required to be that the positive electrode of the voltage source is connected with one end of the inductor in series, or the other end of the inductor is connected with the negative electrode of the voltage source in series.
Compared with the prior art, the invention has the following advantages and beneficial effects:
The invention has simple structure, convenient control mode, continuous input current, and can realize higher output voltage gain at low duty ratio without starting impact problem.
Drawings
Fig. 1 is a circuit schematic diagram of a two-transistor Z-source dc voltage converter according to the present invention.
FIG. 2a and FIG. 2b are the first switch tube S of the dual-tube Z-source DC voltage converter of the present invention1And a second switching tube S2The equivalent circuit diagram of two main stages in the on and off states, in which the solid line represents the part of the converter through which current flows and the dotted line represents the part of the converter through which no current flows.
Fig. 3 is a diagram of simulated primary operating waveforms of the circuit of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Referring to fig. 1, the dual-transistor Z-source dc voltage converter provided in this embodiment includes a voltage source ViAn inductor L, a capacitor C, a firstSwitch tube S1A second switch tube S2A first diode D1A second diode D2And a load R; the voltage source ViThe positive pole of the first switch tube S is connected with one end of an inductor L, and the negative pole of the first switch tube S is respectively connected with the negative pole of the inductor L1Source electrode and first diode D1The cathode of (a) is connected; the first switch tube S1Respectively with a second diode D2The cathode of the capacitor C, the anode of the capacitor C and one end of a load R are connected; the second switch tube S2Respectively with a second diode D2Is connected with the other end of the inductor L; the second switch tube S2Respectively with a first diode D1the anode of the capacitor C, the cathode of the capacitor C and the other end of the load R are connected.
Voltage source ViAnd an inductor L are sequentially connected in series to form a branch circuit, and a voltage source V is arranged in the same branch circuitiThe position of the inductor L can be exchanged, but the voltage source V is required according to the current flowing directioniThe positive electrode of (2) is connected in series with one end of an inductor L, or the other end of the inductor L is connected in series with a voltage source ViThe negative electrode of (1).
First switch tube S1and a second switching tube S2When conducting, the voltage source ViAnd the capacitor C charges the inductor L; the capacitor C supplies power to the load R. First switch tube S1And a second switching tube S2When turned off, the voltage source ViAnd the inductor L through the first diode D1And a second diode D2The capacitor C is charged while the load R is supplied. The invention has simple structure and convenient control mode, and can realize higher output voltage gain at low duty ratio.
Referring to fig. 2a and 2b, a first switch tube S is shown1And a second switching tube S2Equivalent circuit diagrams of two main stages in turn-on and turn-off. With reference to fig. 2a and 2b, the operation process of the dual-transistor Z-source dc voltage converter of the present embodiment is as follows:
Stage 1, as in fig. 2 a: first switch tube S1And a second switching tube S2Is turned on when the first diode D1And a second diode D2Turning off; 2 loops are formed in the circuit, which are respectively:Voltage source ViAnd the capacitor C charges the inductor L; the capacitor C supplies power to the load R.
Stage 2, as in fig. 2 b: first switch tube S1And a second switching tube S2Is turned off when the first diode D1And a second diode D2Conducting; 2 loops are formed in the circuit, which are respectively: voltage source ViAnd the inductor L through the first diode D1And a second diode D2The capacitor C is charged while the load R is supplied.
In summary, in a switching period, let the duty ratio of the switching tube be d, and let the voltages of the inductor L and the capacitor C be vL、vCLet the output voltage be Vothe following derivation of voltage gain is derived.
First switch tube S1And a second switching tube S2During the on period, corresponding to the operation described in phase 1, there is the following formula:
vL＝Vi+vC (1)
First switch tube S1And a second switching tube S2During the shutdown period, corresponding to the operation described in phase 2, there is the following formula:
vL＝Vi-vC (2)
From the above analysis, according to the volt-second characteristic of the inductance, some,
(Vi+vC)d+(Vi-vC)(1-d)＝0 (3)
From equation (3), the capacitor voltage is:
During a switching period, the output voltage is equal to the capacitor voltage, i.e.
From the equation (5), the voltage increase of the double-tube Z-source DC voltage converter of the inventionBenefit isConsistent with the voltage gain of a conventional Z-source converter. Therefore, the invention can realize larger voltage gain under the condition that the duty ratio d is less than 0.5. Meanwhile, the invention only uses one inductor and one capacitor, thus realizing the continuity of input current, reducing the volume of the system and improving the power density of the system.
At a voltage source ViWhen the duty ratio d is 0.4 at 1V, the theoretical analysis result of the output voltage obtained by the equation (5) is Vo5V. The simulation waveforms under the corresponding parameters shown in fig. 3 show that the simulation result of the output voltage is also close to 5V, thereby effectively verifying the correctness of theoretical analysis. In the case of a duty cycle d of 0.4, the voltage gain of the converter of the present invention is 5, while the gain of the conventional Boost converter is 1.67. Therefore, the invention can realize larger voltage gain under the condition that the duty ratio d is less than 0.5. Meanwhile, the invention has simple structure and convenient control, realizes the continuity of input current, improves the power density of the system and has higher application value.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that the changes in the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims (2)

1. A double-tube Z-source direct-current voltage converter is characterized in that: comprising a voltage source (V)i) An inductor (L), a capacitor (C), a first switch tube (S)1) A second switch tube (S)2) A first diode (D)1) A second diode (D)2) And a load (R); the voltage source (V)i) The positive pole of the first switch tube is connected with one end of an inductor (L), and the negative pole of the first switch tube is respectively connected with the first switch tube (S)1) Source and first diode (D)1) The cathode of (a) is connected; the first switch tube (S)1) Respectively with a second diode (D)2) The cathode of the capacitor (C), the anode of the capacitor (C) and one end of the load (R) are connected; the second switch tube (S)2) OfThe poles are respectively connected with a second diode (D)2) Is connected with the other end of the inductor (L); the second switch tube (S)2) Respectively with a first diode (D)1) The anode of (C), the cathode of the capacitor (C) and the other end of the load (R) are connected.
2. The double-tube Z-source direct-current voltage converter according to claim 1, characterized in that: the voltage source (V)i) And an inductor (L) are connected in series in sequence to form a branch circuit, and a voltage source (V) is arranged in the same branch circuiti) The position of the inductor (L) can be exchanged, but the voltage source (V) is required according to the current flowing directioni) One end of the positive electrode of the inductor (L) is connected in series, or the other end of the inductor (L) is connected in series with a voltage source (V)i) The negative electrode of (1).
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CN108462391A (en) * 2018-03-13 2018-08-28 广东工业大学 A kind of impedance network DC-DC converter
CN111162672B (en) * 2020-01-15 2021-04-16 广东工业大学 DC-DC converter based on X-type switch network and switch power supply

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103117650A (en) * 2013-01-24 2013-05-22 东南大学 Quasi Z source inverter
CN203722474U (en) * 2014-02-24 2014-07-16 华南理工大学 Quasi-Z-source DC-DC boost converter circuit
CN206698115U (en) * 2017-04-11 2017-12-01 华南理工大学 A kind of two-tube Z sources DC voltage converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103117650A (en) * 2013-01-24 2013-05-22 东南大学 Quasi Z source inverter
CN203722474U (en) * 2014-02-24 2014-07-16 华南理工大学 Quasi-Z-source DC-DC boost converter circuit
CN206698115U (en) * 2017-04-11 2017-12-01 华南理工大学 A kind of two-tube Z sources DC voltage converter

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
A New Single-Switch Isolated High-Gain Hybrid Boosting Converter;Bin Wu,等;《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》;20160831;第63卷(第8期);第4978-4988页 *
Impedance-Source Networks for Electric Power Conversion Part I: A Topological Review;Yam P. Siwakoti，等;《IEEE TRANSACTIONS ON POWER ELECTRONICS》;20150228;第30卷(第2期);第699-716页 *

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