CN103490620B - A kind of wide gain sepic converter - Google Patents
A kind of wide gain sepic converter Download PDFInfo
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- CN103490620B CN103490620B CN201310423167.4A CN201310423167A CN103490620B CN 103490620 B CN103490620 B CN 103490620B CN 201310423167 A CN201310423167 A CN 201310423167A CN 103490620 B CN103490620 B CN 103490620B
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- diode
- inductance
- energy storage
- electric capacity
- intermediate energy
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Abstract
The invention provides a kind of wide gain sepic converter, mainly comprise a power switch pipe, three inductance, two intermediate energy storage electric capacity, an output capacitance, three diodes.The intrinsic characteristic of inductor-capacitor-diode network is utilized when the present invention works, when power switch pipe turns off, second inductance gives the first intermediate energy storage capacitor charging, first inductive discharge, when power switch pipe conducting, first intermediate energy storage electric capacity and input power give the first induction charging simultaneously, thus boosted output voltages, the characteristic in conjunction with traditional sepic converter realizes the expansion of converter output voltage gain.
Description
Technical field
The present invention relates to 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, the sepic converter simultaneously with boosting and buck functionality obtains application in various degree at increasing industrial circle.But traditional sepic converter is by the restriction of its inherent characteristic, and the excursion of output voltage is less, and output voltage can only be 0 ~ 9 times of input voltage usually.In the occasion that low-voltage high input voltage exports, as distributed energy grid-connected system and fuel cell system, traditional sepic converter becomes no longer applicable.In order to expand the scope of application of traditional sepic converter, it may be necessary technological improvement and expanding its output voltage gain.Above-mentioned target can be realized by the method for cascade but the deficiencies such as the increase of switching tube quantity, stability of a system reduction and decrease in efficiency can be brought.
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 comprises 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 first diode is connected with one end of the first inductance, the positive pole of input power respectively;
The negative electrode of described first diode is connected with the negative electrode of the second diode, one end of the second inductance respectively;
The anode of described second diode is connected with the other end of the first inductance, one 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, one end of the second intermediate energy storage electric capacity respectively;
The other end of described second intermediate energy storage electric capacity is connected with the other end of the 3rd inductance, the anode of the 3rd diode respectively;
The negative electrode of described 3rd diode is connected with one end of output capacitance, one end of load respectively;
The source electrode of described power switch pipe, the other end of the 3rd inductance, the other end of output capacitance are all connected with the negative pole of input power with the other end of load.
Described first diode, the second diode, the 3rd diode are fast recovery diode.
Compared with prior art tool of the present invention has the following advantages:
The present invention is without the need to extra power switch pipe, and structure is simple, and it is convenient to control; The intrinsic characteristic of inductor-capacitor-diode network is utilized when the present invention works, when power switch pipe turns off, second inductance gives the first intermediate energy storage capacitor charging, first inductive discharge, when power switch pipe conducting, first intermediate energy storage electric capacity and input power give the first induction charging simultaneously, thus boosted output voltages, the characteristic in conjunction with traditional sepic converter realizes the expansion of converter output voltage gain.
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 is the groundwork modal graph of circuit diagram shown in Fig. 1 in a switch periods respectively.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 represents in converter the part having electric current to flow through, and dotted line represents in converter the part not having 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 thereto.
Embodiment
As shown in Figure 1, a kind of wide gain sepic converter, mainly comprises 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 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
3with load R.
Described first diode D
1anode respectively with the first inductance L
1one end, input power V
gpositive pole connect;
Described first diode D
1negative electrode respectively with the second diode D
2negative electrode, the second inductance L
2one end connect;
Described second diode D
2anode respectively with the first inductance L
1the other end, the first intermediate energy storage electric capacity C
1one 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 electric capacity C
1the other end, the second intermediate energy storage electric capacity C
2one end connect;
Described second intermediate energy storage electric capacity C
2the other end respectively with the 3rd inductance L
3the other end, the 3rd diode D
3anode connect;
Described 3rd diode D
3negative electrode respectively with output capacitance C
3one end, load R one end connect;
The source electrode of described power switch tube S, the 3rd inductance L
3the other end, output capacitance C
3the other end and load R the other end 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 electric capacity C
1common to the first inductance L
1charging, simultaneously input power V
ggive the second inductance L separately
2charging, the first inductance L
1with the second inductance L
2energy storage, the first intermediate energy storage electric capacity C
1release energy.Second intermediate energy storage electric capacity C
2the 3rd inductance L is given by switching tube S
3charging, the 3rd inductance L
3energy storage.Output capacitance C
3energy is provided to load R.
Under this operation mode, associated electrical parameters relational expression is:
V
L1＝V
g+V
C1（1）
V
L2＝V
g（2）
V
L3＝V
C2（3）
Wherein, V
grepresent input supply voltage, V
l1represent the first inductance L
1both end voltage under this operation mode, V
l2represent the second inductance L
2both end voltage under this operation mode, V
l3represent the 3rd inductance L
3both end voltage under this operation mode, V
c1represent the first intermediate energy storage electric capacity C
1both end voltage, V
c2represent the second intermediate energy storage electric capacity C
2both end voltage.
Operation mode 2:
As shown in Figure 2 b, power switch tube S turns off, the second diode D
2with the 3rd diode D
3conducting, the first diode D
1cut-off.Second inductance L
2through the second diode D
2to electric capacity C
1release energy, the first intermediate energy storage electric capacity C
1energy storage, the first inductance L
1through the 3rd diode D
3release energy, the second intermediate energy storage electric capacity C
2energy storage.Meanwhile, the 3rd inductance L
3through the 3rd diode D
3afterflow, releases energy to load R.
Under this operation mode, associated electrical parameters relational expression is:
V′
L1＝V
o+V
C2-V
C1-V
g（4）
V′
L2＝V
C1（5）
V′
L3＝V
o（6）
Wherein, V '
l1represent the first inductance L
1both end voltage under this operation mode, V '
l2represent the second inductance L
2both end voltage under this operation mode, V '
l3represent the 3rd inductance L
3both end voltage under this operation mode, V
orepresent output voltage.
During converter steady operation, voltage gain is analyzed:
If the switch periods of switching tube work is T
s, duty ratio is D, and namely operation mode 1 duration is DT
s, operation mode 2 duration is (1-D) T
s.According to inductance voltage-second balance characteristic, 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:
Can output thus, the voltage gain M of a kind of wide gain sepic converter of the present invention is:
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, namely 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, have expanded the gain of traditional sepic converter to a great extent.
Compared with prior art tool of the present invention has the following advantages:
The present invention is without the need to extra power switch pipe, and structure is simple, and it is convenient to control;
The intrinsic characteristic of inductor-capacitor-diode network is utilized when the present invention works, when power switch pipe turns off, the second inductance L
2to the first intermediate energy storage electric capacity C
1charging, the first inductance L
1electric discharge, when power switch pipe conducting, the first intermediate energy storage electric capacity C
1with input power V
ggive the first inductance L simultaneously
1charging, thus boosted output voltages, the primary characteristic in conjunction with traditional sepic converter realizes the expansion of converter output voltage gain.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (2)
1. a wide gain sepic converter, is characterized in that, mainly comprise 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);
Described first diode (D
1) anode respectively with the first inductance (L
1) one end, input power (V
g) positive pole connect;
Described first diode (D
1) negative electrode respectively with the second diode (D
2) negative electrode, the second inductance (L
2) one end connect;
Described second diode (D
2) anode respectively with the first inductance (L
1) the other end, the first intermediate energy storage electric capacity (C
1) one 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) one end connect;
Described second intermediate energy storage electric capacity (C
2) the other end respectively with the 3rd inductance (L
3) one end, the 3rd diode (D
3) anode connect;
Described 3rd diode (D
3) negative electrode respectively with output capacitance (C
3) one end, load (R) one end 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 load (R) the other end all with input power (V
g) negative pole connect.
2. one according to claim 1 wide gain sepic converter, is characterized in that described first diode (D
1), the second diode (D
2), the 3rd diode (D
3) be fast recovery diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310423167.4A CN103490620B (en) | 2013-09-16 | 2013-09-16 | A kind of wide gain sepic converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310423167.4A CN103490620B (en) | 2013-09-16 | 2013-09-16 | A kind of wide gain sepic converter |
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| Publication Number | Publication Date |
|---|---|
| CN103490620A CN103490620A (en) | 2014-01-01 |
| CN103490620B true CN103490620B (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310423167.4A Active CN103490620B (en) | 2013-09-16 | 2013-09-16 | A kind of wide gain sepic converter |
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| 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 (4)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100986346B1 (en) * | 2007-10-19 | 2010-10-08 | 기아자동차주식회사 | Stabilizer for vehicle Lamp |
-
2013
- 2013-09-16 CN CN201310423167.4A patent/CN103490620B/en active Active
Patent Citations (4)
| 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 |
| 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 |
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|---|---|
| CN103490620A (en) | 2014-01-01 |
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