CN103490620A - Wide-gain sepic converter - Google Patents

Wide-gain sepic converter Download PDF

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Publication number
CN103490620A
CN103490620A CN201310423167.4A CN201310423167A CN103490620A CN 103490620 A CN103490620 A CN 103490620A CN 201310423167 A CN201310423167 A CN 201310423167A CN 103490620 A CN103490620 A CN 103490620A
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diode
inductance
energy storage
gain
sepic converter
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CN201310423167.4A
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CN103490620B (en
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张波
张能
黄子田
丘东元
肖文勋
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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 invention provides a wide-gain sepic converter. The wide-gain sepic converter mainly comprises a power switch tube, three inductors, two middle energy-storage capacitors, an output capacitor and three diodes. In the working process of the wide-gain sepic converter, the inherent properties of an inductor-capacitor-diode network are utilized, when the power switch tube is switched off, the second inductor charges the first middle energy-storage capacitor, and the first inductor discharges; when the power switch tube is switched on, the first middle energy-storage capacitor and an input power supply charge the first inductor simultaneously, therefore, output voltage is boosted, and the gain of output voltage of the converter is expanded by combining original characteristics of a traditional sepic converter.

Description

A kind of wide gain sepic converter
Technical field
The present invention relates to the converters technical field, be specifically related to a kind of wide gain sepic converter.
Background technology
Along with life and industrial expansion, more and more higher to the requirement of converters, there is the sepic converter boosted with buck functionality simultaneously and obtained application in various degree at increasing industrial circle.But traditional sepic converter is subject to the restriction of its inherent characteristic, the excursion of output voltage is less, and output voltage can only be 0～9 times of input voltage usually.In the occasion of low-voltage high input voltage output, as distributed energy grid-connected system and fuel cell system, traditional sepic converter becomes no longer applicable.In order to enlarge the scope of application of traditional sepic converter, be necessary to expand its output voltage gain by technological improvement.But method by cascade can realize above-mentioned target can bring that switching tube quantity increases, the stability of a system reduces and the deficiencies such as decrease in efficiency.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of wide gain sepic converter is provided.
The present invention is achieved through the following technical solutions:
A kind of wide gain sepic converter, mainly comprise input power, power switch pipe, the first inductance, the second inductance, the 3rd inductance, the first intermediate energy storage electric capacity, the second intermediate energy storage electric capacity, output capacitance, the first diode, the second diode, the 3rd diode and load.
The anode of described the first diode is connected with an end of the first inductance, the positive pole of input power respectively;
The negative electrode of described the first diode is connected with the negative electrode of the second diode, an end of the second inductance respectively;
The anode of described the second diode is connected with the other end of the first inductance, an end of the first intermediate energy storage electric capacity respectively;
The drain electrode of described power switch pipe is connected with the other end of the second inductance, the other end of the first intermediate energy storage electric capacity, an end of the second intermediate energy storage electric capacity respectively;
The other end of described the second intermediate energy storage electric capacity respectively with the other end of the 3rd inductance, the anodic bonding of the 3rd diode;
The negative electrode of described the 3rd diode is connected with an end of output capacitance, an end of load respectively;
The other end of the other end of the source electrode of described power switch pipe, the 3rd inductance, the other end of output capacitance and load all is connected with the negative pole of input power.
Described the first diode, the second diode, the 3rd diode are fast recovery diode.
Compared with prior art the present invention has following advantage:
The present invention is without extra power switch pipe, simple in structure, and it is convenient to control; When working, the present invention utilizes the intrinsic characteristic of inductor-capacitor-diode network, when power switch pipe turn-offs, the second inductance is given the first intermediate energy storage capacitor charging, the first inductive discharge, when the power switch pipe conducting, the first intermediate energy storage electric capacity and input power are given the first induction charging simultaneously, thereby boosted output voltages is realized the expansion of converter output voltage gain in conjunction with the characteristic of traditional sepic converter.
The accompanying drawing explanation
Fig. 1 is the circuit diagram of the embodiment of a kind of wide gain sepic converter of the present invention;
Fig. 2 a and Fig. 2 b are respectively the groundwork mode figure of circuit diagram shown in Fig. 1 in a switch periods.Wherein Fig. 2 a is the circuit diagram of operation mode 1, and Fig. 2 b is the circuit diagram of operation mode 2.In figure, solid line means in converter the part that has electric current to flow through, and dotted line means in converter the part that does not have electric current to flow through;
Fig. 3 is the gain contrast curve chart of converter of the present invention and traditional sepic converter.
Embodiment
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 to this.
Embodiment
As shown in Figure 1, a kind of wide gain sepic converter, mainly comprise input power V g, power switch tube S, the first inductance L 1, the second inductance L 2, the 3rd inductance L 3, the first intermediate energy storage capacitor C 1, the second intermediate energy storage capacitor C 2, output capacitance C 3, the first diode D 1, the second diode D 2, the 3rd diode D 3with load R.
Described the first diode D 1anode respectively with the first inductance L 1an end, input power V gpositive pole connect;
Described the first diode D 1negative electrode respectively with the second diode D 2negative electrode, the second inductance L 2an end connect;
Described the second diode D 2anode respectively with the first inductance L 1the other end, the first intermediate energy storage capacitor C 1an end connect;
The drain electrode of described power switch tube S respectively with the second inductance L 2the other end, the first intermediate energy storage capacitor C 1the other end, the second intermediate energy storage capacitor C 2an end connect;
Described the second intermediate energy storage capacitor C 2the other end respectively with the 3rd inductance L 3the other end, the 3rd diode D 3anodic bonding;
Described the 3rd diode D 3negative electrode respectively with output capacitance C 3the end of an end, load R connect;
The source electrode of described power switch tube S, the 3rd inductance L 3the other end, output capacitance C 3the other end and the other end of load R all with input power V gnegative pole connect.
As shown in Figure 2 a and 2 b, a kind of wide gain sepic converter mainly contains 2 operation modes in a switch periods, is described below respectively:
Operation mode 1:
As shown in Figure 2 a, power switch tube S is open-minded, the first diode D 1conducting, the second diode D 2with the 3rd diode D 3cut-off.Input power V gwith the first intermediate energy storage capacitor C 1common first inductance L of giving 1charging, input power V simultaneously ggive separately the second inductance L 2charging, the first inductance L 1with the second inductance L 2energy storage, the first intermediate energy storage capacitor C 1release energy.The second intermediate energy storage capacitor C 2give the 3rd inductance L by switching tube S 3charging, the 3rd inductance L 3energy storage.Output capacitance C 3energy is provided to load R.
Under this operation mode, the related electric parameter relationship formula is:
V L1＝V g+V C1 （1）
V L2＝V g （2）
V L3＝V C2 （3）
Wherein, V gmean input supply voltage, V l1mean the first inductance L 1both end voltage under this operation mode, V l2mean the second inductance L 2both end voltage under this operation mode, V l3mean the 3rd inductance L 3both end voltage under this operation mode, V c1mean the first intermediate energy storage capacitor C 1both end voltage, V c2mean the second intermediate energy storage capacitor C 2both end voltage.
Operation mode 2:
As shown in Figure 2 b, power switch tube S is turn-offed, the second diode D 2with the 3rd diode D 3conducting, the first diode D 1cut-off.The second inductance L 2through the second diode D 2to capacitor C 1release energy, the first intermediate energy storage capacitor C 1energy storage, the first inductance L 1through the 3rd diode D 3release energy, the second intermediate energy storage capacitor C 2energy storage.Simultaneously, the 3rd inductance L 3through the 3rd diode D 3afterflow, to load, R releases energy.
Under this operation mode, the related electric parameter relationship formula is:
V′ L1＝V o+V C2-V C1-V g （4）
V′ L2＝V C1 （5）
V′ L3＝V o （6）
Wherein, V ' l1mean the first inductance L 1both end voltage under this operation mode, V ' l2mean the second inductance L 2both end voltage under this operation mode, V ' l3mean the 3rd inductance L 3both end voltage under this operation mode, V omean output voltage.
During the converter steady operation, voltage gain is analyzed:
If the switch periods of switching tube work is T s, duty ratio is D, 1 duration of operation mode is DT s, 2 duration of operation mode are (1-D) T s.According to inductance weber equilibrium response, can obtain:
V L1DT s＝V′ L1(1-D)T s （7）
V L2DT s＝V′ L2(1-D)T s （8）
V L3DT s＝V′ L3(1-D)T s （9）
Simultaneous formula (1)～formula (9) can obtain:
V C 1 = D 1 - D V g - - - ( 10 )
V C 2 = 1 1 - D V g - - - ( 11 )
V o = D ( 1 - D ) 2 V g - - - ( 12 )
Can output thus, the voltage gain M of a kind of wide gain sepic converter of the present invention is:
M = V o V d = D ( 1 - D ) 2
As shown in Figure 3, when duty ratio D changes in 0～0.8 scope, the gain of tradition sepic converter can only change in 0～4 scope, be that output voltage can only be 0～4 times of input voltage, and the gain of converter of the present invention can change in 0～24 scope, the highest 24 times of can reach input voltage of output voltage, the gain of having expanded to a great extent traditional sepic converter.
Compared with prior art the present invention has following advantage:
The present invention is without extra power switch pipe, simple in structure, and it is convenient to control;
When working, the present invention utilizes the intrinsic characteristic of inductor-capacitor-diode network, when power switch pipe turn-offs, and the second inductance L 2give the first intermediate energy storage capacitor C 1charging, the first inductance L 1electric discharge, when the power switch pipe conducting, the first intermediate energy storage capacitor C 1with input power V ggive the first inductance L simultaneously 1charging, thus boosted output voltages is realized the expansion of converter output voltage gain in conjunction with the primary characteristic of traditional sepic converter.
Above-described embodiment is preferably execution mode of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.

Claims (3)

1. one kind wide gain sepic converter, is characterized in that, mainly comprises input power (V g), power switch pipe (S), the first inductance (L 1), the second inductance (L 2), the 3rd inductance (L 3), the first intermediate energy storage electric capacity (C 1), the second intermediate energy storage electric capacity (C 2), output capacitance (C 3), the first diode (D 1), the second diode (D 2), the 3rd diode (D 3) and load (R).
2. a kind of wide gain sepic converter according to claim 1 is characterized in that:
Described the first diode (D 1) anode respectively with the first inductance (L 1) an end, input power (V g) positive pole connect;
Described the first diode (D 1) negative electrode respectively with the second diode (D 2) negative electrode, the second inductance (L 2) an end connect;
Described the second diode (D 2) anode respectively with the first inductance (L 1) the other end, the first intermediate energy storage electric capacity (C 1) an end connect;
The drain electrode of described power switch pipe (S) respectively with the second inductance (L 2) the other end, the first intermediate energy storage electric capacity (C 1) the other end, the second intermediate energy storage electric capacity (C 2) an end connect;
Described the second intermediate energy storage electric capacity (C 2) the other end respectively with the 3rd inductance (L 3) the other end, the 3rd diode (D 3) anodic bonding;
Described the 3rd diode (D 3) negative electrode respectively with output capacitance (C 3) an end of an end, load (R) connect;
The source electrode of described power switch pipe (S), the 3rd inductance (L 3) the other end, output capacitance (C 3) the other end and the other end of load (R) all with input power (V g) negative pole connect.
3. a kind of wide gain sepic converter according to claim 1, is characterized in that described the first diode (D 1), the second diode (D 2), the 3rd diode (D 3) be fast recovery diode.
CN201310423167.4A 2013-09-16 2013-09-16 A kind of wide gain sepic converter Active CN103490620B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107086775A (en) * 2017-06-19 2017-08-22 广东工业大学 A kind of DC DC converters and booster system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200701609A (en) * 2005-06-17 2007-01-01 Wai Zheng Zhong High-efficiency single-stage bidirectional converter with multi-input power sources
US20090102384A1 (en) * 2007-10-19 2009-04-23 Hyundai Motor Company Illuminance stabilization apparatus for vehicle headlamp
CN101882869A (en) * 2010-06-21 2010-11-10 华南理工大学 High-gain boost converter with inductance-capacitance switching network
CN203261235U (en) * 2013-06-04 2013-10-30 王琳 High-gain SEPIC converter
CN203590023U (en) * 2013-09-16 2014-05-07 华南理工大学 Wide-gain sepic converter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200701609A (en) * 2005-06-17 2007-01-01 Wai Zheng Zhong High-efficiency single-stage bidirectional converter with multi-input power sources
US20090102384A1 (en) * 2007-10-19 2009-04-23 Hyundai Motor Company Illuminance stabilization apparatus for vehicle headlamp
CN101882869A (en) * 2010-06-21 2010-11-10 华南理工大学 High-gain boost converter with inductance-capacitance switching network
CN203261235U (en) * 2013-06-04 2013-10-30 王琳 High-gain SEPIC converter
CN203590023U (en) * 2013-09-16 2014-05-07 华南理工大学 Wide-gain sepic converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107086775A (en) * 2017-06-19 2017-08-22 广东工业大学 A kind of DC DC converters and booster system

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