CN111464023B - High-gain step-up and step-down Sepic DC-DC converter - Google Patents
High-gain step-up and step-down Sepic DC-DC converter Download PDFInfo
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- CN111464023B CN111464023B CN202010367161.XA CN202010367161A CN111464023B CN 111464023 B CN111464023 B CN 111464023B CN 202010367161 A CN202010367161 A CN 202010367161A CN 111464023 B CN111464023 B CN 111464023B
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- 239000003990 capacitor Substances 0.000 claims abstract description 75
- 238000000034 method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 6
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- 238000011217 control strategy Methods 0.000 description 1
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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
-
- 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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
-
- 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
- H02M3/08—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- 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
- H02M3/1557—Single ended primary inductor converters [SEPIC]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A high gain step-up and step-down Sepic DC-DC converter, the converter comprising: an input power source, a loadR L A basic Sepic converter,nand a base unit. The basic Sepic converter comprises two inductorsL 1 、L 2 Two capacitorsC 1 、C 2 A power switch S 1 One diode D 1 . The converter has the advantages of simple control and driving circuit, wide input and output voltage regulation range, low voltage stress of a switching device and the like, and is suitable for application occasions with larger input or output voltage variation range and high boost and buck gain.
Description
Technical Field
The invention relates to a DC-DC converter, in particular to a high-gain step-up and step-down Sepic DC-DC converter.
Background
In applications where the input and output voltages vary widely, the input voltage may be higher or lower than the output voltage, and the non-isolated Buck-boost DC-DC converter is commonly used in this case, including Buck-Boost, cuk, sepic and Zeta circuits. Theoretically, by adjusting the duty ratio D, the input/output gain of these converters can be changed from zero to infinity, but the boosting capability of these converters is greatly limited due to the influence of parasitic parameters of components and circuits. The current scheme for improving the input and output gains of the DC-DC converter is mostly constructed based on Boost circuits, so that the circuits can only generally realize boosting and cannot realize reducing, and the circuit is difficult to be applied to the application occasions with large input and output voltage changes. Therefore, the research can realize high-gain boosting and simultaneously realize the novel wide-input-output buck-boost DC/DC converter with buck and has important significance.
Disclosure of Invention
In order to solve the problem that the existing non-isolated high-gain DC-DC converter can not realize high-gain boosting and reducing simultaneously, the invention provides a high-gain boosting and reducing Sepic DC-DC converter which consists of a basic Sepic converter and a 'coat circuit'. The 'coat circuit' comprises a plurality of gain units, each basic unit is composed of an inductor, two capacitors and a diode, and the input and output gain of the converter and the voltage stress of the switching device can be adjusted by adjusting the number of the basic units; the converter has the advantages of simple control and driving circuit, wide input and output voltage regulation range, low voltage stress of a switching device and the like, and is suitable for application occasions with larger input or output voltage variation range and high boost and buck gain.
The technical scheme adopted by the invention is as follows:
a high gain step-up and step-down Sepic DC-DC converter, the converter comprising:
an input power source, a load R L A basic Sepic converter, n basic units; wherein:
the basic Sepic converter comprises two inductors L 1 、L 2 Two capacitors C 1 、C 2 A power switch S 1 One diode D 1 The method comprises the steps of carrying out a first treatment on the surface of the The connection form is as follows:
inductance L 1 Is connected with the positive electrode of an input power supply, and the inductance L 1 The other ends of the two power switches are respectively connected with a power switch S 1 Drain electrode of (C) and capacitor (C) 1 Capacitance C 1 And the other end of (2) is connected with inductance L 2 One end of diode D 1 Is connected with the anode of diode D 1 Cathode and capacitor C of (2) 2 Is connected to one end of a power switch S 1 Source electrode of (d) and inductance L 2 And the other end of (C) and the capacitor C 2 The other ends of the two electrodes are connected with the negative electrode of the input power supply;
the components and internal connection forms of the n basic units are the same:
the 1 st base unit contains: inductance L 11 One diode D 11 Two capacitors C 11 、C 12 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the capacitor C 11 Respectively with the other end of the inductor L 11 One end of diode D 11 Anode of (C) is connected with inductance L 11 And the other end of (C) and the capacitor C 12 Is connected with the other end of the connecting rod;
the 2 nd base unit contains: inductance L 21 One diode D 21 Two capacitors C 21 、C 22 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the capacitor C 21 Respectively with the other end of the inductor L 21 One end of diode D 21 Anode of (C) is connected with inductance L 21 And the other end of (C) and the capacitor C 22 Is connected with the other end of the connecting rod;
.. analogize to the case of the i-th base unit, it contains: inductance L i1 One diode D i1 Two capacitors C i1 、C i2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the capacitor C i1 Respectively with the other end of the inductor L i1 One end of diode D i1 Anode of (C) is connected with inductance L i1 And the other end of (C) and the capacitor C i2 Is connected with the other end of the connecting rod;
the connection form among the basic units is as follows, 1<i is less than or equal to n;
capacitor C in the 1 st basic cell 11 One end of (2) and capacitor C in the 2 nd base unit 21 Is connected to one end of the 1 st basic cell diode D 11 Cathode and capacitor C of (2) 12 And the inductance L in the 2 nd basic unit 21 And the other end of (C) and the capacitor C 22 Is connected with the intersection point connected with the other end of the frame;
capacitor C in the 2 nd base unit 21 One end of (2) and the capacitor C in the 3 rd base unit 31 Is connected to one end of diode D in the 2 nd basic cell 21 Cathode and capacitor C of (2) 22 And the inductance in the 3 rd base unitL 31 And the other end of (C) and the capacitor C 32 Is connected with the intersection point connected with the other end of the frame;
.. analogize, i-1 base cell capacitor C (i-1)1 Is connected with the capacitor C in the ith basic unit i1 Is connected to one end of the diode D in the i-1 th basic cell (i-1)1 Cathode and capacitor C of (2) (i-1)2 And the inductance L in the ith base unit i1 And the other end of (C) and the capacitor C i2 Is connected with the intersection point connected with the other end of the frame;
the connection relationship between the 1 st base unit and the basic Sepic converter is as follows:
capacitor C in basic Sepic converter 1 Is connected with the inductor L 1 And the other end of (a) and a power switch S 1 The intersection of the drain connections to the capacitor C in the 1 st base cell 11 Is connected with one end of the connecting rod;
diode D in basic Sepic converter 1 Cathode and capacitor C of (2) 2 Is connected to the capacitor C in the 1 st basic cell 12 And the other end of (2) is connected with inductance L 11 Is connected with the intersection point connected with the other end of the frame;
load R L Is connected with capacitor C in the nth basic unit n2 One end of (D) and diode D i1 Connected at the intersection of the cathode connections, a load R L The other end of the power supply is connected with the negative electrode of the input power supply.
The power switch S 1 The gate of which is connected to its controller and the duty cycle of which can vary from 0 to 1.
The invention relates to a high-gain boosting and reducing Sepic DC-DC converter, which has the following technical effects:
1. the converter can realize voltage increase and decrease at the same time, and has high input and output gain and low voltage stress of the switching device. The method comprises the following steps:
inductance L 1 Is continuously conducted:
the input/output gain is:
the voltage stress of the switching tube is as follows:
wherein D is the duty cycle, u in For input voltage u o To output voltage u s N is the base cell number for the power switch voltage stress.
2. The converter only comprises 1 power switch, and the control strategy and the driving circuit are simple.
3. The converter can realize the adjustment of the input and output gain of the converter and the voltage stress of the switching device by adjusting the number of the basic units. The converter has the advantages of simple control and driving circuit, wide input and output voltage regulation range, low voltage stress of a switching device and the like, and is suitable for application occasions with larger input or output voltage variation range and high boost and buck gain.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a circuit topology diagram of the present invention with a basic unit number of 2.
Fig. 3 is a schematic diagram of a conventional Sepic converter circuit.
Fig. 4 is a graph showing the comparison between the input/output gain of the basic unit number of the present invention at 2 and the input/output gain of the conventional Sepic converter.
Fig. 5 is a waveform diagram of simulation of input voltage and output voltage when the number of basic cells is 2.
Fig. 6 is a simulated waveform diagram of the voltage across the switch and the duty cycle for a base unit number of 2 in accordance with the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
The circuit topology of the present invention with a base unit number of 2 is shown in fig. 2:
a high gain step-up and step-down Sepic DC-DC converter includes a DC input source, a load R L A basic Sepic converter, two basic units. Wherein:
the basic Sepic converter comprises two inductors L 1 、L 2 Two capacitors C 1 、C 2 A power switch S 1 One diode D 1 . The connection form is as follows: inductance L 1 One end of the power switch is connected with the positive pole of the input power supply, and the other end is connected with the power switch S 1 Drain of (d) and capacitor C 1 Capacitance C 1 And the other end of (2) is connected with inductance L 2 One end of (D) and diode D 1 Is connected with the anode of diode D 1 Cathode and capacitor C of (2) 2 Is connected to one end of a power switch S 1 Source electrode of (d) and inductance L 2 And the other end of (C) and the capacitor C 2 The other end of the power supply is connected with the negative electrode of the input power supply.
The base unit contains: inductance L 11 One diode D 11 Two capacitors C 11 、C 12 . Wherein the capacitance C 11 And the other end of (2) is connected with inductance L 11 One end of (D) and diode D 11 Is connected with the anode of diode D 11 Cathode and capacitor C of (2) 12 Is connected to one end of capacitor C 12 And the other end of (2) is connected with inductance L 11 Is connected to the other end of the pipe.
The connection relationship between the base unit and the basic Cuk converter is as follows: capacitor C in basic Sepic converter 1 Is connected with the inductor L 1 And the other end of (a) and a power switch S 1 The intersection of the drain connections to the capacitor C in the base cell 11 Is connected to one end of a diode D in the basic Sepic converter 1 Cathode and capacitor C of (2) 2 The intersection point of one end connection of (C) is connected with the capacitor of the basic unit 12 And the other end of (2) is connected with inductance L 11 Is connected to the intersection point connected to the other end of the frame.
Load R L One end of (2) and capacitor C in the 2 nd base unit 22 One end of (D) and diode D 21 Connected at the intersection of the cathode connections, a load R L The other end of the power supply is connected with the negative electrode of the input power supply.
The power switch S 1 The gate of which is connected to its controller and the duty cycle of which can vary from 0 to 1.
At inductance L 1 Is continuous in current conductionWhen the power switch is on, the circuit can be divided into 2 working states according to different power switch states:
(1) Power switch S 1 Conduction, diode D 1 、D 11 、D 21 All turn off, at this time the inductor L 1 、L 2 、L 11 、L 21 Capacitance C 11 、C 21 Charging, capacitor C 1 、C 2 、C 12 、C 22 Discharging; inductance L 1 、L 2 、L 11 、L 21 The terminal voltage is shown as follows:
(2) Power switch S 1 Turn-off, diode D 1 、D 11 、D 21 All are conducted, at this time the inductance L 1 、L 2 、L 11 、L 21 Capacitance C 11 、C 21 Discharging, capacitance C 1 、C 2 、C 12 、C 22 Charging; inductance L 1 、L 2 、L 11 、L 21 The terminal voltage is shown as follows:
fig. 4 is a graph showing the comparison between the input/output gain of the basic unit number of the present invention at 2 and the input/output gain of the conventional Sepic converter. It can be seen from fig. 4 that the input/output gain of the proposed converter is greatly improved compared to the conventional Sepic converter.
FIG. 5 is a simulation waveform diagram of input voltage and output voltage when the basic unit number is 2, and specific simulation parameters are: input voltage u in =48v, duty cycle d=73.53%, load resistance R L =400 Ω. According to the input voltage and the duty ratio, when the number of the expansion units is calculated to be 2 according to theoretical analysis, the output voltage of the converter is about 400V. The simulated waveforms of the input and output voltages shown in FIG. 5 are matched with the theoretical analysisThereby verifying the correctness and feasibility of theoretical analysis
Fig. 6 is a simulation waveform diagram of voltage and duty ratio at two ends of a switch when the number of basic units is 2, and specific simulation parameters are: input voltage u in =48v, duty cycle d=73.53%, load resistance R L =400 Ω. According to the input voltage and the duty ratio, the voltage stress of the switching tube can be calculated to be about 180V according to theoretical analysis. The switching tube voltage stress simulation shown in fig. 6 is consistent with theoretical analysis, and compared with the conventional Sepic converter, the switching tube voltage stress of the converter is significantly reduced.
Claims (2)
1. A high gain step-up and step-down Sepic DC-DC converter, the converter comprising:
an input power source, a load R L A basic Sepic converter, n basic units; wherein:
the basic Sepic converter comprises two inductors L 1 、L 2 Two capacitors C 1 、C 2 A power switch S 1 One diode D 1 The method comprises the steps of carrying out a first treatment on the surface of the The connection form is as follows:
inductance L 1 Is connected with the positive electrode of an input power supply, and the inductance L 1 The other ends of the two power switches are respectively connected with a power switch S 1 Drain electrode of (C) and capacitor (C) 1 Capacitance C 1 And the other end of (2) is connected with inductance L 2 One end of diode D 1 Is connected with the anode of diode D 1 Cathode and capacitor C of (2) 2 Is connected to one end of a power switch S 1 Source electrode of (d) and inductance L 2 And the other end of (C) and the capacitor C 2 The other ends of the two electrodes are connected with the negative electrode of the input power supply;
the components and internal connection forms of the n basic units are the same:
the 1 st base unit contains: inductance L 11 One diode D 11 Two capacitors C 11 、C 12 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the capacitor C 11 Respectively with the other end of the inductor L 11 One end of diode D 11 Anode of (C) is connected with inductance L 11 And the other end of (C) and the capacitor C 12 Is connected with the other end of the connecting rod;
the 2 nd base unit contains: inductance L 21 One diode D 21 Two capacitors C 21 、C 22 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the capacitor C 21 Respectively with the other end of the inductor L 21 One end of diode D 21 Anode of (C) is connected with inductance L 21 And the other end of (C) and the capacitor C 22 Is connected with the other end of the connecting rod;
.. analogize to the case of the i-th base unit, it contains: inductance L i1 One diode D i1 Two capacitors C i1 、C i2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the capacitor C i1 Respectively with the other end of the inductor L i1 One end of diode D i1 Anode of (C) is connected with inductance L i1 And the other end of (C) and the capacitor C i2 Is connected with the other end of the connecting rod;
the connection form among the basic units is as follows, 1<i is less than or equal to n;
capacitor C in the 1 st basic cell 11 One end of (2) and capacitor C in the 2 nd base unit 21 Is connected to one end of the 1 st basic cell diode D 11 Cathode and capacitor C of (2) 12 And the inductance L in the 2 nd basic unit 21 And the other end of (C) and the capacitor C 22 Is connected with the intersection point connected with the other end of the frame;
capacitor C in the 2 nd base unit 21 One end of (2) and the capacitor C in the 3 rd base unit 31 Is connected to one end of diode D in the 2 nd basic cell 21 Cathode and capacitor C of (2) 22 And the inductance L in the 3 rd base unit 31 And the other end of (C) and the capacitor C 32 Is connected with the intersection point connected with the other end of the frame;
.. analogize, i-1 base cell capacitor C (i-1)1 Is connected with the capacitor C in the ith basic unit i1 Is connected to one end of the diode D in the i-1 th basic cell (i-1)1 Cathode and capacitor C of (2) (i-1)2 And the inductance L in the ith base unit i1 And the other end of (C) and the capacitor C i2 Another of (2)The intersection points of the end connection are connected;
the connection relationship between the 1 st base unit and the basic Sepic converter is as follows:
capacitor C in basic Sepic converter 1 Is connected with the inductor L 1 And the other end of (a) and a power switch S 1 The intersection of the drain connections to the capacitor C in the 1 st base cell 11 Is connected with one end of the connecting rod;
diode D in basic Sepic converter 1 Cathode and capacitor C of (2) 2 Is connected to the capacitor C in the 1 st basic cell 12 And the other end of (2) is connected with inductance L 11 Is connected with the intersection point connected with the other end of the frame;
load R L Is connected with capacitor C in the nth basic unit n2 One end of (D) and diode D i1 Connected at the intersection of the cathode connections, a load R L The other end of the power supply is connected with the negative electrode of the input power supply.
2. The high gain step-up and step-down Sepic DC-DC converter of claim 1, wherein: the power switch S 1 The gate of which is connected to its controller and the duty cycle of which can vary from 0 to 1.
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| CN202010367161.XA CN111464023B (en) | 2020-04-30 | 2020-04-30 | High-gain step-up and step-down Sepic DC-DC converter |
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| CN202010367161.XA CN111464023B (en) | 2020-04-30 | 2020-04-30 | High-gain step-up and step-down Sepic DC-DC converter |
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| CN111464023B true CN111464023B (en) | 2023-05-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113691127B (en) * | 2021-08-29 | 2023-07-11 | 三峡大学 | Single-input high-reliability capacitance-current consistent Boost DC-DC converter |
| CN113890358B (en) * | 2021-09-10 | 2023-11-21 | 三峡大学 | Three-port high-reliability sepic DC-DC converter |
| CN113890357B (en) * | 2021-09-10 | 2023-11-21 | 三峡大学 | Multi-working-condition high-gain three-port DC-DC converter based on Sepic |
| CN113965082A (en) * | 2021-10-11 | 2022-01-21 | 三峡大学 | Double-input high-reliability capacitor current consistent Cuk DC-DC converter |
Citations (2)
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|---|---|---|---|---|
| CN206620051U (en) * | 2017-03-22 | 2017-11-07 | 华南理工大学 | A kind of multi input high-gain Z source converters based on switching capacity unit |
| CN108809091A (en) * | 2018-06-19 | 2018-11-13 | 四川大学 | A kind of single switch buck multiple constant current output switch converters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10199935B2 (en) * | 2014-09-12 | 2019-02-05 | The Regents Of The University Of California | Hybrid boosting converters |
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|---|---|---|---|---|
| CN206620051U (en) * | 2017-03-22 | 2017-11-07 | 华南理工大学 | A kind of multi input high-gain Z source converters based on switching capacity unit |
| CN108809091A (en) * | 2018-06-19 | 2018-11-13 | 四川大学 | A kind of single switch buck multiple constant current output switch converters |
Non-Patent Citations (3)
| Title |
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| Pandav Kiran Maroti.A novel multilevel high gain modified SEPIC DC-to-DC converter for high voltage/low current renewable energy applications.2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG 2018).2018,第1-6页. * |
| 苏东奇等.基于 CDM 升压单元的高增益 Boost 变换器.电力自动化设备.2014,第34卷(第7期),第15-20页. * |
| 荣德生等.新型高增益耦合电感组合Sepic变换器.电源学报.2020,第1-16页. * |
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Application publication date: 20200728 Assignee: Hubei Yunzhihang Drone Technology Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980044730 Denomination of invention: A High Gain Boost and Buck Sepic DC-DC Converter Granted publication date: 20230502 License type: Common License Record date: 20231027 |
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