CN203827173U - Single-tube Boost-Buck-Boost converter - Google Patents

Single-tube Boost-Buck-Boost converter Download PDF

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Publication number
CN203827173U
CN203827173U CN201320719472.3U CN201320719472U CN203827173U CN 203827173 U CN203827173 U CN 203827173U CN 201320719472 U CN201320719472 U CN 201320719472U CN 203827173 U CN203827173 U CN 203827173U
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diode
inductance
boost
buck
boost converter
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CN201320719472.3U
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张波
付坚
丘东元
肖文勋
黄子田
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South China University of Technology SCUT
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South China University of Technology SCUT
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Abstract

The utility model provides a single-tube Boost-Buck-Boost converter. According to the utility model, a direct-current power supply (Vin), a switching tube (S), a first diode (D1), a third diode (D3) and a first capacitor (C1) forms an input Boost converter, and the first capacitor (C1), the switching tube (S), a second diode (D2), a second capacitor (C2) and a load (R) forms an output Buck-Boost converter. Only one switching tube (S) achieves the cascading of the Boost converter with the Buck-Boost converter, and a gain can reach D/(1-D)2. In addition, an input current of the cascading converter is continuous, thereby well facilitating the filtering of the input current.

Description

A kind of single tube Boost-Buck-Boost converter
Technical field
The utility model relates to cascade DC-DC converter field, is specifically related to a kind of single tube Boost-Buck-Boost converter converter.
Background technology
In recent years, high gain boost DC-DC converter is widely used in UPS, distributed photovoltaic power generation and battery energy storage system.At present, high gain boost DC-DC converter has switching capacity type, switched inductors type, realizes the rising of voltage by increasing switching capacity or inductance, also makes circuit structure become very complicated simultaneously.In addition, realize high-gain by isolating transformer or coupling inductance in addition, but the leakage inductance of transformer and coupling inductance is difficult to control, can greatly increases stress and the energy loss of device.In addition, cascade connection type DC-DC converter can be realized high-gain, be subject to equally very large favor, if by basic Boost converter and the cascade of Buck-Boost converter, can obtain high-gain cascade converter simple in structure, be still a difficult problem but how to use a switching tube to realize high-gain cascade converter.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, proposes a kind of single tube Boost-Buck-Boost converter converter.
The technical solution adopted in the utility model is: a kind of single tube Boost-Buck-Boost converter converter, comprises the Boost converter forming with DC power supply, switching tube, the first inductance, the first diode, the 3rd diode and the first electric capacity; The Buck-Boost converter forming with the first electric capacity, switching tube, the second inductance, the second diode, the second electric capacity and load.
In described converter, one end of the first inductance is connected with the positive pole of direct voltage, and the other end is connected with the anode of the first electric capacity with the drain electrode of switching tube simultaneously; One end of the second inductance is connected with the negative electrode of the first electric capacity, the anode of the first diode, the anode of the second diode simultaneously, and the other end is connected with the source electrode of switching tube, anode, the negative electrode of the second electric capacity and one end of load of the 3rd diode simultaneously; The other end of load is connected with the anode of the second electric capacity with the negative electrode of the second diode simultaneously; The negative pole of DC power supply is connected with the negative electrode of the 3rd diode with the negative electrode of the first diode simultaneously.
In the time that switching tube is opened, the first diode and the cut-off of the second diode, the 3rd diode current flow, DC power supply is given the first induction charging, and the first electric capacity is given the second induction charging, simultaneously the second electric capacity powering load; In the time that switching tube turn-offs, the first inductance is by the first diode continuousing flow, and the second inductance is by the second diode continuousing flow, and the 3rd diode ends, and DC power supply and the first inductance are given the first capacitor charging jointly, and the second inductance is given the second electric capacity and load supplying simultaneously.
Converter comprises that the electric current of the first inductance and the electric current of the second inductance all work in continuous conduction mode (L 1-L 2-CCM pattern), the electric current of the first inductance or the current work of the second inductance be in continuous conduction mode (L 1/ L 2-CCM pattern), wherein L 1/ L 2the current work that-CCM pattern comprises the first inductance in continuous conduction mode and the current work of the second inductance in the current work of discontinuous conduction mode, the first inductance in discontinuous conduction mode and the current work of the second inductance in continuous conduction mode, comprise that the electric current of the first inductance and the electric current of the second inductance all work in discontinuous conduction mode.
Compared with prior art, the advantage the utlity model has is: only use a switching tube, realize the cascade of Boost converter and Buck-Boost converter, simplified greatly circuit structure, gain as D/ (1-D) 2.
Brief description of the drawings
Fig. 1 is a kind of single tube Boost-Buck-Boost transformer configuration figure of the present utility model;
Fig. 2 is that a kind of single tube Boost-Buck-Boost converter shown in Fig. 1 works in L 1-L 2crucial current waveform figure under-CCM pattern;
Fig. 3 is that a kind of single tube Boost-Buck-Boost converter shown in Fig. 1 works in L 1/ L 2crucial current waveform figure under-DCM pattern;
Fig. 4 a~Fig. 4 d is respectively four kinds of operation modes of a kind of single tube Boost-Buck-Boost converter shown in Fig. 1;
Fig. 5 is that a kind of single tube Boost-Buck-Boost converter in Fig. 1 works in L 1-L 2the simulation waveform figure of-CCM pattern;
Fig. 6 is that a kind of single tube Boost-Buck-Boost converter in Fig. 1 works in L 1/ L 2the simulation waveform figure of-DCM pattern.
Embodiment
For further setting forth content of the present utility model and feature, below in conjunction with accompanying drawing, specific embodiments of the present utility model is specifically described.But enforcement of the present utility model is not limited to this.
With reference to figure 1, a kind of single tube Boost-Buck-Boost converter of the present utility model, DC power supply V in, switching tube S, the first inductance L 1, the first diode D 1, the 3rd diode D 3with the first capacitor C 1the Boost converter forming; With the first capacitor C 1, switching tube S, the second inductance L 2, the second diode D 2, the second capacitor C 2buck-Boost converter with load R formation.Wherein, the first inductance L 1one end and direct voltage V inpositive pole be connected, the first inductance L 1the other end simultaneously with drain electrode and the first capacitor C of switching tube S 1anode be connected; The second inductance L 2one end simultaneously and the first capacitor C 1negative electrode, the first diode D 1anode, the second diode D 2anode be connected, the second inductance L 2the other end simultaneously with source electrode, the 3rd diode D of switching tube S 3anode, the second capacitor C 2negative electrode be connected with one end of load R; Other end while and the second diode D of load R 2negative electrode and the second capacitor C 2anode be connected; DC power supply V innegative pole simultaneously and the first diode D 1negative electrode and the 3rd diode D 3negative electrode be connected.
Taking Fig. 1 as main circuit structure, narrate specific works principle of the present utility model in conjunction with Fig. 2~Fig. 4 below.
First consider that converter is operated in L 1-L 2-CCM pattern:
T in Fig. 2 0-t 1in the stage, switching tube S is open-minded, the first diode D 1with the second diode D 2cut-off, the 3rd diode D 3conducting, DC power supply V inthrough switching tube S and the 3rd diode D 3give the first inductance L 1charging, the first inductance L 1current i l1linear rising, the first capacitor C 1give the second inductance L through switching tube S 2charging, the second inductance L 2current i l2linear rising, simultaneously the second capacitor C 2give load R power supply, current path is as shown in Fig. 4 a; T in Fig. 2 1-t 2in the stage, switching tube S turn-offs, the first inductance L 1by the first diode D 1afterflow, the second inductance L 2by the second diode D 2afterflow, the 3rd diode D 3cut-off, DC power supply V inwith the first inductance L 1through the first diode D 1common first capacitor C of giving 1charging, the first inductance L 1current i l1linear decline, the second inductance L 2through the second diode D 2give the second capacitor C simultaneously 2with load R power supply, the second inductance L 2current i l2linear decline, current path as shown in Figure 4 b.Crucial current waveform figure as shown in Figure 3.
Consider that again converter is operated in L 1/ L 2-DCM pattern, with the first inductance L 1electric current and the second inductance L 2electric current all work in discontinuous conduction mode and the first inductance L 1current ratio the second inductance L 2electric current reduce in advance zero and describe for example:
T in Fig. 3 0-t 1with t 1-t 2t in the course of work of phase transformation device and above-mentioned Fig. 2 0-t 1with t 1-t 2stage is identical.T 2moment, the first inductance L 1current i l1reduce to zero.
T in Fig. 3 2-t 3in the stage, switching tube S turn-offs, the first diode D 1with the 3rd diode D 3cut-off, the second inductance L 2continue through the second diode D 2the second capacitor C is given in afterflow simultaneously 2with load R power supply, the second inductance L 2current i l2continue linear decline, current path is as shown in Fig. 4 c.T 3moment, the second inductance L 2current i l2reduce to zero.
T in Fig. 3 3-t 4in the stage, switching tube S turn-offs, the first diode D 1, the second diode D 2with the 3rd diode D 3cut-off, the second capacitor C 2give load R power supply, current path is as shown in Fig. 4 d.
Fig. 5 is by being provided converter to work in L 1-L 2the analogous diagram of-CCM pattern, has verified the correctness that above-mentioned theory is analyzed.
Fig. 6 is by being provided converter to work in L 1/ L 2the analogous diagram of-DCM pattern, has verified the correctness that above-mentioned theory is analyzed.

Claims (2)

1. a single tube Boost-Buck-Boost converter, is characterized in that comprising with DC power supply (V in), switching tube (S), the first inductance (L 1), the first diode (D 1), the 3rd diode (D 3) and the first electric capacity (C 1) form Boost converter; With the first electric capacity (C 1), switching tube (S), the second inductance (L 2), the second diode (D 2), the second electric capacity (C 2) and load (R) form Buck-Boost converter.
2. a kind of single tube Boost-Buck-Boost converter according to claim 1, is characterized in that: the first inductance (L 1) one end and direct voltage (V in) positive pole be connected, the first inductance (L 1) other end simultaneously with drain electrode and the first electric capacity (C of switching tube (S) 1) anode be connected; The second inductance (L 2) one end simultaneously and the first electric capacity (C 1) negative electrode, the first diode (D 1) anode, the second diode (D 2) anode be connected, the second inductance (L 2) other end simultaneously with source electrode, the 3rd diode (D of switching tube (S) 3) anode, the second electric capacity (C 2) negative electrode be connected with one end of load (R); Other end while and the second diode (D of load (R) 2) negative electrode and the second electric capacity (C 2) anode be connected; DC power supply (V in) negative pole simultaneously and the first diode (D 1) negative electrode and the 3rd diode (D 3) negative electrode be connected.
CN201320719472.3U 2013-11-14 2013-11-14 Single-tube Boost-Buck-Boost converter Active CN203827173U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103633833A (en) * 2013-11-14 2014-03-12 华南理工大学 Single-switching-tube converter Boost-Buck-Boost converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103633833A (en) * 2013-11-14 2014-03-12 华南理工大学 Single-switching-tube converter Boost-Buck-Boost converter
CN103633833B (en) * 2013-11-14 2017-01-11 华南理工大学 Single-switching-tube converter Boost-Buck-Boost converter

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