CN113890340B - Single-input high-reliability capacitance-current consistent buck-boost DC-DC converter - Google Patents
Single-input high-reliability capacitance-current consistent buck-boost DC-DC converter Download PDFInfo
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- CN113890340B CN113890340B CN202111023036.8A CN202111023036A CN113890340B CN 113890340 B CN113890340 B CN 113890340B CN 202111023036 A CN202111023036 A CN 202111023036A CN 113890340 B CN113890340 B CN 113890340B
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- 239000003990 capacitor Substances 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
Classifications
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A single-input high-reliability capacitance-current consistent buck-boost DC-DC converter comprises a direct current input source, a basic buck converter and n gain expansion units. The gain expansion unit is composed of two inductors, two capacitors, a diode and a switching tube, and the input and output gains of the converter can be realized by adjusting the number of the gain expansion units. The converter has the characteristics of simple control and driving circuit, wide input and output voltage regulation range and high reliability, and when any one of the switching tubes in the circuit is damaged, the other circuits can work normally. The converter is suitable for application occasions with large output and input voltage and output voltage variation range and high reliability requirements.
Description
Technical Field
The invention relates to a DC-DC converter, in particular to a single-input high-reliability capacitance-current consistent type Buck-boost 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. A common non-isolated Buck-boost DC-DC converter suitable for use in this case is the Buck-Boost, cuk, sepic and Zeta circuit. 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.
At present, the scheme of the input/output gain of the single-input DC-DC converter is mostly constructed by adopting basic circuit cascading, but the reliability is poor. Therefore, research can realize high-gain boosting and simultaneously has important significance for the single-input buck-boost DC/DC converter with high reliability.
Disclosure of Invention
The method aims to solve the problem that an existing non-isolated single-input high-gain DC-DC converter is low in reliability. The invention provides a single-input high-reliability capacitance-current consistent type Buck-boost DC-DC converter based on a basic Buck-boost converter. The input and output gains of the converter can be realized by adjusting the number of the gain expansion units. The converter has the characteristics of simple control and driving circuit, wide input and output voltage regulation range and high reliability; when one switching tube in the converter circuit is damaged, other circuits can work normally; the converter is suitable for application occasions with large output and input voltage and output voltage variation range and high reliability requirements.
The technical scheme adopted by the invention is as follows:
a single-input high-reliability capacitive-current consistent Buck-boost DC-DC converter, the converter comprising: a basic Buck-boost converter, n gain expansion units;
the basic Buck-boost converter comprises an inductance L 1 Capacitance C 1 Power switch S 1 Diode D 1 ；
DC input source u in Positive electrode connection power switch S 1 Drain, power switch S 1 The source electrodes are respectively connected with the inductance L 1 One end of diode D 1 Cathode, diode D 1 Anode connection capacitor C 1 One end of the capacitor C 1 Another end, inductance L 1 The other ends are connected with a direct current input source u in A negative electrode;
the 1 st gain expansion unit comprises an inductance L 21 、L 22 Capacitance C 21 、C 22 Diode D 2 Power switch S 2 The method comprises the steps of carrying out a first treatment on the surface of the Power switch S 2 The drain electrode is connected with a direct current input source u in Positive pole, power switch S 2 The source electrodes are respectively connected with the inductance L 21 One end, capacitorC 21 One end of the capacitor C 21 The other end is connected with an inductor L 22 One end of diode D 2 Cathode, diode D 2 Anode connection capacitor C 22 One end of the capacitor C 22 The other end is connected with an inductor L 22 Another end, inductance L 21 The other end is connected with a grounding end;
the 2 nd gain expansion unit comprises an inductance L 31 、L 32 Capacitance C 31 、C 32 Diode D 3 A power switch S 3 The method comprises the steps of carrying out a first treatment on the surface of the Power switch S 3 The drain electrode is connected with a direct current input source u in Positive pole, power switch S 3 The source electrodes are respectively connected with the inductance L 31 One end, capacitor C 31 One end of the capacitor C 31 The other end is connected with an inductor L 32 One end of diode D 3 Cathode, diode D 3 Anode connection capacitor C 32 One end of the capacitor C 32 The other end is connected with an inductor L 32 Another end, inductance L 31 The other end is connected with a grounding end;
… … and so on,
the nth gain expansion unit includes an inductance L n+1,1 、L n+1,2 Capacitance C n+1,1 、C n+1,2 Diode D n+1 Power switch S n+1 ；
Power switch S n+1 The drain electrode is connected with a direct current input source u in Positive pole, power switch S n+1 The source electrodes are respectively connected with the inductance L n+1,1 One end, capacitor C n+1,1 One end of the capacitor C n+1,1 The other end is connected with an inductor L n+1,2 One end of diode D n+1 Cathode, diode D n+1 Anode connection capacitor C n+1,2 One end of the capacitor C n+1,2 The other end is connected with an inductor L n+1,2 Another end, inductance L n+1,1 The other end is connected with a grounding end;
capacitor C in basic Buck-boost converter 1 The other end is connected with a capacitor C in the 1 st gain expansion unit 22 At one end, the connection relation of each gain expansion unit is as follows:
capacitor C in the 1 st gain expansion cell 22 The other end is connected with a capacitor C in the 2 nd gain expansion unit 32 One end, capacitor C in the 2 nd gain expansion unit 32 The other end is connected with a capacitor C in the 3 rd gain expansion unit 42 One end of the capacitor C is … … and so on, and the capacitor C in the n-1 gain expansion unit n，2 The other end is connected with a capacitor C in the nth gain expansion unit n+1,2 One end;
the two ends of the load R are respectively connected with the capacitor C 1 One end, capacitor C n+1,2 And the other end.
The power switch S 1 Power switch S 2 、S 3 ……S n+1 The grid electrodes of the switch tube are connected with the controller, the duty ratio of the switch tube can be changed between 0 and 1, and when any one of the switch tube is damaged, the whole circuit can continue to work normally.
The invention relates to a single-input high-reliability capacitance-current consistent type Buck-boost DC-DC converter, which has the following technical effects:
1) The voltage can be increased and decreased simultaneously, the input and output gains are high, and the output capacitors are connected in series and are in voltage equalizing. When the inductor current is continuously conducted, the following is specific:
voltage input output gain
The voltage stress of the switching tube is as follows:the voltage stress of the diode is: />
Voltage on each output capacitor:
wherein: d is the duty cycle.
2) When one of the power switch tubes in the gain expansion units except the basic Buck-boost converter is damaged, the rest circuits can work normally.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a schematic diagram of a conventional Buck-boost converter circuit.
Fig. 3 is a circuit topology diagram of the gain expansion unit number of 2 in the present invention.
Fig. 4 is a graph showing the comparison between the input/output gain and the input/output gain of the conventional Buck-boost converter when the number of gain expansion units is 2 in the present invention.
Fig. 5 is a simulation diagram of the output waveform of the present invention when the input voltage is 30V and the gain expansion unit is 2 and d=0.6.
Fig. 6 is a simulation diagram of an output waveform when the switching tube S3 is damaged when the input voltage of the present invention is 30V and the gain expansion unit is 2 and d=0.6.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 3, a circuit topology diagram of the gain expansion unit number of the present invention is 2:
a single-input high-reliability capacitive-current consistent Buck-boost DC-DC converter, the converter comprising: a basic Buck-boost converter, 2 gain expansion units;
the basic Buck-boost converter comprises an inductance L 1 Capacitance C 1 Power switch S 1 Diode D 1 ；
DC input source u in Positive electrode connection power switch S 1 Drain, power switch S 1 The source electrodes are respectively connected with the inductance L 1 One end of diode D 1 Cathode, diode D 1 Anode connection capacitor C 1 One end of the capacitor C 1 Another end, inductance L 1 The other ends are connected with a direct current input source u in A negative electrode;
the 1 st gain expansion unit comprises an inductance L 21 、L 22 Capacitance C 21 、C 22 Diode D 2 Power switch S 2 The method comprises the steps of carrying out a first treatment on the surface of the Power switch S 2 The drain electrode is connected with a direct current input source u in Positive pole, power switch S 2 The source electrodes are respectively connected with the inductance L 21 One end, capacitor C 21 One end of the capacitor C 21 The other end is connected with an inductor L 22 One end of diode D 2 Cathode, diode D 2 Anode connection capacitor C 22 One end of the capacitor C 22 The other end is connected with an inductor L 22 Another end, inductance L 21 The other end is connected with a grounding end;
the 2 nd gain expansion unit comprises an inductance L 31 、L 32 Capacitance C 31 、C 32 Diode D 3 A power switch S 3 The method comprises the steps of carrying out a first treatment on the surface of the Power switch S 3 The drain electrode is connected with a direct current input source u in Positive pole, power switch S 3 The source electrodes are respectively connected with the inductance L 31 One end, capacitor C 31 One end of the capacitor C 31 The other end is connected with an inductor L 32 One end of diode D 3 Cathode, diode D 3 Anode connection capacitor C 32 One end of the capacitor C 32 The other end is connected with an inductor L 32 Another end, inductance L 31 The other end is connected with the grounding end.
The two ends of the load R are respectively connected with the capacitor C 1 One end, capacitor C 32 And the other end.
The gates of the power switches S1, S2 and S3 are connected to their controllers, and their duty cycles can vary from 0 to 1. The on-off time of the power switches S1, S2 and S3 can be controlled by adjusting the duty ratio, and the output voltage level can be adjusted according to the voltage balance formula of the inductor.
When the number of the gain expansion units is equal to 2 and all the inductive currents are continuously conducted, the circuit can be divided into 2 working states according to different power switches:
(1): power switch S 1 、S 2 S and S 3 Conduction, diode D 1 、D 2 、D 3 Are all turned off. Inductance L 1 、L 21 、L 22 、L 31 、 L 31 The terminal voltage is shown as follows:
(2): power switch S 1 、S 2 S and S 3 Turn-off, diode D 1 、D 2 、D 3 All open. Inductance L 1 、L 21 、L 22 、L 31 、 L 31 The terminal voltage is shown as follows:
from the duty cycle of the controller connected to the gates of power switches S1, S2 and S3, the voltage level across each capacitor is derived as follows:
fig. 4 is a graph showing the comparison between the input/output gain of the gain expansion unit of the present invention with 2 and the input/output gain of the conventional Buck-boost converter. As can be seen from fig. 4, the gain of the converter proposed by the present invention is 3 times that of the conventional converter when the duty cycle is the same.
Fig. 5 is a simulation diagram of the output waveform when the number of gain expansion units is 2 and d=0.6 when the input voltage is 30V. Simulation verifies the feasibility of the invention.
Fig. 6 is a simulation diagram of the output waveform when the switching tube S3 is damaged when the input voltage of the invention is 30V and the gain expansion unit number is 2 and d=0.6, and the reliability of the invention is verified by simulation.
Claims (2)
1. A single-input high-reliability capacitance-current consistent type Buck-boost DC-DC converter is characterized in that the converter comprises: a basic Buck-boost converter, n gain expansion units;
the basic Buck-boost converter comprises an inductance L 1 Capacitance C 1 Power switch S 1 Diode D 1 ；
DC input source u in Positive electrode connection power switch S 1 Drain, power switch S 1 The source electrodes are respectively connected with the inductance L 1 One end of diode D 1 Cathode, diode D 1 Anode connection capacitor C 1 One end of the capacitor C 1 Another end, inductance L 1 The other ends are connected with a direct current input source u in A negative electrode;
the 1 st gain expansion unit comprises an inductance L 21 、L 22 Capacitance C 21 、C 22 Diode D 2 Power switch S 2 The method comprises the steps of carrying out a first treatment on the surface of the Power switch S 2 The drain electrode is connected with a direct current input source u in Positive pole, power switch S 2 The source electrodes are respectively connected with the inductance L 21 One end, capacitor C 21 One end of the capacitor C 21 The other end is connected with an inductor L 22 One end of diode D 2 Cathode, diode D 2 Anode connection capacitor C 22 One end of the capacitor C 22 The other end is connected with an inductor L 22 Another end, inductance L 21 The other end is connected with a grounding end;
the 2 nd gain expansion unit comprises an inductance L 31 、L 32 Capacitance C 31 、C 32 Diode D 3 A power switch S 3 The method comprises the steps of carrying out a first treatment on the surface of the Power switch S 3 The drain electrode is connected with a direct current input source u in Positive pole, power switch S 3 The source electrodes are respectively connected with the inductance L 31 One end, capacitor C 31 One end of the capacitor C 31 The other end is connected with an inductor L 32 One end of diode D 3 Cathode, diode D 3 Anode connection capacitor C 32 One end of the capacitor C 32 The other end is connected with an inductor L 32 Another end, inductance L 31 The other end is connected with a grounding end;
… … and so on,
the nth gain expansion unit includes an inductance L n+1,1 、L n+1,2 Capacitance C n+1,1 、C n+1,2 Diode D n+1 Power switch S n+1 ；
Power switch S n+1 The drain electrode is connected with a direct current input source u in Positive pole, power switch S n+1 The source electrodes are respectively connected withInductance L n+1,1 One end, capacitor C n+1,1 One end of the capacitor C n+1,1 The other end is connected with an inductor L n+1,2 One end of diode D n+1 Cathode, diode D n+1 Anode connection capacitor C n+1,2 One end of the capacitor C n+1,2 The other end is connected with an inductor L n+1,2 Another end, inductance L n+1,1 The other end is connected with a grounding end;
capacitor C in basic Buck-boost converter 1 The other end is connected with a capacitor C in the 1 st gain expansion unit 22 At one end, the connection relation of each gain expansion unit is as follows:
capacitor C in the 1 st gain expansion cell 22 The other end is connected with a capacitor C in the 2 nd gain expansion unit 32 One end, capacitor C in the 2 nd gain expansion unit 32 The other end is connected with a capacitor C in the 3 rd gain expansion unit 42 One end of the capacitor C is … … and so on, and the capacitor C in the n-1 gain expansion unit n，2 The other end is connected with a capacitor C in the nth gain expansion unit n+1,2 One end;
the two ends of the load R are respectively connected with the capacitor C 1 One end, capacitor C n+1,2 The other end;
when the gain expansion unit is equal to 2, the circuit can be divided into 2 working states according to different power switches when the inductance current is continuously conducted:
(1): power switch S 1 、S 2 S and S 3 Conduction, diode D 1 、D 2 、D 3 All are turned off; inductance L 1 、L 21 、L 22 、L 31 、L 31 The terminal voltage is shown as follows:
(2): power switch S 1 、S 2 S and S 3 Turn-off, diode D 1 、D 2 、D 3 All open; inductance L 1 、L 21 、L 22 、L 31 、L 31 The terminal voltage is shown as follows:
2. the single-input high-reliability capacitive current consistent-type Buck-boost DC-DC converter of claim 1, wherein: the power switch S 1 Power switch S 2 、S 3 ……S n+1 The gates of which are connected to a controller, the duty cycle of which may vary between 0 and 1.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701923A (en) * | 2020-12-25 | 2021-04-23 | 三峡大学 | Novel high-gain Zeta DC-DC converter |
| CN112713766A (en) * | 2020-12-25 | 2021-04-27 | 三峡大学 | Novel high-gain Cuk DC-DC converter |
| CN112737330A (en) * | 2020-12-25 | 2021-04-30 | 三峡大学 | Novel high-gain Buck-Boost DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701923A (en) * | 2020-12-25 | 2021-04-23 | 三峡大学 | Novel high-gain Zeta DC-DC converter |
| CN112713766A (en) * | 2020-12-25 | 2021-04-27 | 三峡大学 | Novel high-gain Cuk DC-DC converter |
| CN112737330A (en) * | 2020-12-25 | 2021-04-30 | 三峡大学 | Novel high-gain Buck-Boost DC-DC converter |
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Application publication date: 20220104 Assignee: Nanjing Chixun Electric Technology Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980049857 Denomination of invention: A single input high reliability capacitive current consistent buck boost DC-DC converter Granted publication date: 20231027 License type: Common License Record date: 20231206 |
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