CN113890340A - 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 PDF

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CN113890340A
CN113890340A CN202111023036.8A CN202111023036A CN113890340A CN 113890340 A CN113890340 A CN 113890340A CN 202111023036 A CN202111023036 A CN 202111023036A CN 113890340 A CN113890340 A CN 113890340A
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capacitor
terminal
inductor
power switch
diode
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CN113890340B (en
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邾玢鑫
张畅
刘佳欣
支树播
王凯宏
杨楠
李振华
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China Three Gorges University CTGU
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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
    • 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 type 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 switch tube, and 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 drive 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 variation range of output-input voltage and output voltage and high reliability requirement.

Description

Single-input high-reliability capacitance-current consistent buck-boost DC-DC converter
Technical Field
The invention relates to a DC-DC converter, in particular to a single-input high-reliability capacitance current consistent Buck-boost DC-DC converter.
Background
In applications where both input and output voltages vary widely, the input voltage may be higher or lower than the output voltage. Common non-isolated Buck-Boost DC-DC converters suitable for the time are Buck-Boost, Cuk, Sepic and Zeta circuits. Theoretically, by adjusting the duty ratio D, the input-output gain of these converters can be varied from zero to infinity, but the boost capability of these converters is greatly limited due to the influence of the parasitic parameters of the components and circuits.
At present, the scheme of the input and output gains of the single-input DC-DC converter is mostly constructed by basic circuit cascade, but the reliability is poor. Therefore, the research on the single-input buck-boost DC/DC converter which can realize high-gain boost and has high reliability has important significance.
Disclosure of Invention
The problem that the existing non-isolated single-input high-gain DC-DC converter is low in reliability is solved. The invention provides a single-input high-reliability capacitance current consistent type Buck-boost DC-DC converter based on a basic Buck-boost converter, which consists of the basic Buck-boost converter and a plurality of gain expansion units. 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 drive 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 variation range of output-input voltage and output voltage and high reliability requirement.
The technical scheme adopted by the invention is as follows:
a single-input high-reliability capacitance-current-unity Buck-boost DC-DC converter, the converter comprising: the system comprises a basic Buck-boost converter and n gain expansion units;
the basic Buck-boost converter comprises an inductor L1Capacitor C1Power switch S1Diode D1；
DC input source uinPositive pole connected power switch S1Drain, power switch S1The source electrodes are respectively connected with an inductor L1One terminal, diode D1Cathode, diode D1Anode connected capacitor C1One terminal, capacitor C1Another terminal, an inductance L1The other ends are connected with a direct current input source uinA negative electrode;
the 1 st gain expansion unit comprises an inductor L21、L22Capacitor C21、C22Diode D2Power switch S2(ii) a Power switch S2Drain connected to DC input source uinPositive pole, power switch S2The source electrodes are respectively connected with an inductor L21One terminal, capacitor C21One terminal, capacitor C21The other ends are respectively connected with an inductor L22One terminal, diode D2Cathode, diode D2Anode connected capacitor C22One terminal, capacitor C22The other end is connected with an inductor L22Another terminal, inductor L21The other end is connected with a grounding end;
the 2 nd gain expansion unit comprises an inductor L31、L32Capacitor C31、C32Diode D3A power switch S3(ii) a Power switch S3Drain connected to DC input source uinPositive pole, power switch S3The source electrodes are respectively connected with an inductor L31One terminal, capacitor C31One terminal, capacitor C31The other ends are respectively connected with an inductor L32One terminal, diode D3Cathode, diode D3Anode connected capacitor C32One terminal, capacitor C32The other end is connected with an inductor L32Another terminal, inductor L31The other end is connected with a grounding end;
… … and so on, the method comprises the following steps,
the nth gain expansion unit comprises an inductor Ln+1,1、Ln+1,2Capacitor Cn+1,1、Cn+1,2Diode Dn+1Power switch Sn+1；
Power switch Sn+1Drain connected to DC input source uinPositive pole, power switch Sn+1The source electrodes are respectively connected with an inductor Ln+1,1One terminal, capacitor Cn+1,1One terminal, capacitor Cn+1,1The other ends are respectively connected with an inductor Ln+1,2One terminal, diode Dn+1Cathode, diode Dn+1Anode connected capacitor Cn+1,2One terminal, capacitor Cn+1,2The other end is connected with an inductor Ln+1,2Another terminal, inductor Ln+1,1The other end is connected with a grounding end;
capacitance C in basic Buck-boost converter1The other end is connected with a capacitor C in the 1 st gain expansion unit22On one end, the connection relationship of each gain expansion unit is as follows:
capacitance C in the 1 st gain expansion unit22The other end is connected with a capacitor C in the 2 nd gain expansion unit32One terminal, capacitor C in the 2 nd gain expansion unit32The other end is connected with a capacitor C in the 3 rd gain expansion unit42One terminal, … … and so on, and the capacitance C in the (n-1) th gain expansion unitn，2The other end is connected with a capacitor C in the nth gain expansion unitn+1,2One end;
the two ends of the load R are respectively connected with a capacitor C1One terminal, capacitor Cn+1,2And the other end.
The power switch S1Power switch S2、S3……Sn+1The grid electrodes of the switching tubes are connected with a controller, the duty ratio of the grid electrodes can be changed from 0 to 1, and when any one of the switching tubes is damaged, the whole circuit can continue to work normally.
The invention discloses a single-input high-reliability capacitance current consistent Buck-boost DC-DC converter, which has the following technical effects:
1) the buck-boost circuit can realize voltage boost and buck simultaneously, has high input and output gains, and has serially connected output capacitors and voltage sharing. When the inductor current is continuously conducted, the following details are provided:
voltage input output gain
Figure BDA0003242357000000031
The voltage stress of the switching tube is as follows:
Figure BDA0003242357000000032
the voltage stress of the diode is:
Figure BDA0003242357000000033
voltage on each output capacitor:
Figure BDA0003242357000000034
wherein: and D is the duty cycle.
2) And when one of the power switch tubes in the gain expansion unit except the basic Buck-boost converter is damaged, the rest circuits can work normally.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Fig. 2 is a schematic diagram of a conventional Buck-boost converter circuit.
Fig. 3 is a circuit topology diagram when the number of gain expansion units in the present invention is 2.
Fig. 4 is a graph comparing the input and output gains of the Buck-boost converter with the input and output gains of the conventional Buck-boost converter when the number of gain expansion units is 2.
Fig. 5 is a simulation diagram of an output waveform when the input voltage is 30V and the gain expansion unit is 2 and D is 0.6 according to the present invention.
Fig. 6 is a simulation diagram of an output waveform when the switching tube S3 is broken when the input voltage is 30V, the gain expansion unit is 2, and D is 0.6 according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 3, it is a circuit topology diagram when the number of gain expansion units is 2 according to the present invention:
a single-input high-reliability capacitance-current-unity Buck-boost DC-DC converter, the converter comprising: a basic Buck-boost converter, 2 gain expansion units;
the basic Buck-boost converter comprises an inductor L1Capacitor C1Power switch S1Diode D1；
DC input source uinPositive pole connected power switch S1Drain, power switch S1The source electrodes are respectively connected with an inductor L1One terminal, diode D1Cathode, diode D1Anode connected capacitor C1One terminal, capacitor C1Another terminal, an inductance L1The other ends are connected with a direct current input source uinA negative electrode;
the 1 st gain expansion unit comprises an inductor L21、L22Capacitor C21、C22Diode D2Power switch S2(ii) a Power switch S2Drain connected to DC input source uinPositive pole, power switch S2The source electrodes are respectively connected with an inductor L21One terminal, capacitor C21One terminal, capacitor C21The other ends are respectively connected with an inductor L22One terminal, diode D2Cathode, diode D2Anode connected capacitor C22One terminal, capacitor C22The other end is connected with an inductor L22Another terminal, inductor L21The other end is connected with a grounding end;
the 2 nd gain expansion unit comprises an inductor L31、L32Capacitor C31、C32Diode D3A power switch S3(ii) a Power switch S3Drain connected to DC input source uinPositive pole, power switch S3The source electrodes are respectively connected with an inductor L31One terminal, capacitor C31One terminal, capacitor C31The other ends are respectively connected with an inductor L32One terminal, diode D3Cathode, diode D3Anode connected capacitor C32One terminal, capacitor C32The other end is connected with an inductor L32Another terminal, inductor L31The other end is connected with a grounding terminal。
The two ends of the load R are respectively connected with a capacitor C1One terminal, capacitor C32And the other end.
The power switches S1, S2 and S3 have their gates connected to their controllers and their duty cycles can be varied 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 gain expansion units is equal to 2 and all inductor currents are continuously conducted, the circuit can be divided into 2 working states according to different power switches:
(1): power switch S1、S2And S3Conducting, diode D1、D2、D3Are all turned off. Inductor L1、L21、L22、L31、 L31The terminal voltage is shown as follows:
Figure BDA0003242357000000041
(2): power switch S1、S2And S3Turn-off, diode D1、D2、D3Are all turned on. Inductor L1、L21、L22、L31、 L31The terminal voltage is shown as follows:
Figure BDA0003242357000000051
from the duty cycles of the controllers connected to the gates of the power switches S1, S2, and S3, the voltage levels across each capacitor can be derived as follows:
Figure BDA0003242357000000052
fig. 4 is a graph comparing the input and output gains of the Buck-boost converter of the present invention with the gain expansion unit number of 2. As can be seen from fig. 4, the gain of the proposed converter is 3 times that of the conventional converter at the same duty cycle.
Fig. 5 is a simulation diagram of an output waveform when the input voltage is 30V and the number of gain expansion units is 2 and D is 0.6 according to the present invention. The feasibility of the invention is verified by simulation.
Fig. 6 is a simulation diagram of an output waveform when the switching tube S3 is broken when the input voltage is 30V, the number of gain expansion units is 2, and D is 0.6, according to the present invention, and the reliability of the present invention is verified by simulation.

Claims (4)

1. A single-input high-reliability capacitor-current-unity Buck-boost DC-DC converter, the converter comprising: the system comprises a basic Buck-boost converter and n gain expansion units;
the basic Buck-boost converter comprises an inductor L1Capacitor C1Power switch S1Diode D1；
DC input source uinPositive pole connected power switch S1Drain, power switch S1The source electrodes are respectively connected with an inductor L1One terminal, diode D1Cathode, diode D1Anode connected capacitor C1One terminal, capacitor C1Another terminal, an inductance L1The other ends are connected with a direct current input source uinA negative electrode;
the 1 st gain expansion unit comprises an inductor L21、L22Capacitor C21、C22Diode D2Power switch S2(ii) a Power switch S2Drain connected to DC input source uinPositive pole, power switch S2The source electrodes are respectively connected with an inductor L21One terminal, capacitor C21One terminal, capacitor C21The other ends are respectively connected with an inductor L22One terminal, diode D2Cathode, diode D2Anode connected capacitor C22One terminal, capacitor C22The other end is connected with an inductor L22Another terminal, inductor L21The other end is connected with a grounding end;
the 2 nd gain expansion unit comprises an inductor L31、L32Capacitor C31、C32Diode D3A power switch S3(ii) a Power switch S3Drain connected to DC input source uinPositive pole, power switch S3The source electrodes are respectively connected with an inductor L31One terminal, capacitor C31One terminal, capacitor C31The other ends are respectively connected with an inductor L32One terminal, diode D3Cathode, diode D3Anode connected capacitor C32One terminal, capacitor C32The other end is connected with an inductor L32Another terminal, inductor L31The other end is connected with a grounding end;
… … and so on, the method comprises the following steps,
the nth gain expansion unit comprises an inductor Ln+1,1、Ln+1,2Capacitor Cn+1,1、Cn+1,2Diode Dn+1Power switch Sn+1；
Power switch Sn+1Drain connected to DC input source uinPositive pole, power switch Sn+1The source electrodes are respectively connected with an inductor Ln+1,1One terminal, capacitor Cn+1,1One terminal, capacitor Cn+1,1The other ends are respectively connected with an inductor Ln+1,2One terminal, diode Dn+1Cathode, diode Dn+1Anode connected capacitor Cn+1,2One terminal, capacitor Cn+1,2The other end is connected with an inductor Ln+1,2Another terminal, inductor Ln+1,1The other end is connected with a grounding end;
capacitance C in basic Buck-boost converter1The other end is connected with a capacitor C in the 1 st gain expansion unit22On one end, the connection relationship of each gain expansion unit is as follows:
capacitance C in the 1 st gain expansion unit22The other end is connected with a capacitor C in the 2 nd gain expansion unit32One terminal, capacitor C in the 2 nd gain expansion unit32The other end is connected with a capacitor C in the 3 rd gain expansion unit42One terminal, … … and so on, and the capacitance C in the (n-1) th gain expansion unitn，2The other end is connected with a capacitor C in the nth gain expansion unitn+1,2One end;
load R twoThe ends are respectively connected with a capacitor C1One terminal, capacitor Cn+1,2And the other end.
2. The single-input high-reliability capacitance-current uniform Buck-boost DC-DC converter according to claim 1, characterized in that: the power switch S1Power switch S2、S3……Sn+1The duty cycle of the gate of (1) is variable between 0 and 1.
3. A single-input high-reliability capacitance-current consistent type Buck-boost DC-DC converter is characterized in that: the converter includes: a basic Buck-boost converter, 2 gain expansion units;
the basic Buck-boost converter comprises an inductor L1Capacitor C1Power switch S1Diode D1；
DC input source uinPositive pole connected power switch S1Drain, power switch S1The source electrodes are respectively connected with an inductor L1One terminal, diode D1Cathode, diode D1Anode connected capacitor C1One terminal, capacitor C1Another terminal, an inductance L1The other ends are connected with a direct current input source uinA negative electrode;
the 1 st gain expansion unit comprises an inductor L21、L22Capacitor C21、C22Diode D2Power switch S2(ii) a Power switch S2Drain connected to DC input source uinPositive pole, power switch S2The source electrodes are respectively connected with an inductor L21One terminal, capacitor C21One terminal, capacitor C21The other ends are respectively connected with an inductor L22One terminal, diode D2Cathode, diode D2Anode connected capacitor C22One terminal, capacitor C22The other end is connected with an inductor L22Another terminal, inductor L21The other end is connected with a grounding end;
the 2 nd gain expansion unit comprises an inductor L31、L32Capacitor C31、C32Diode D3A power switch S3(ii) a Power switch S3Drain connected to DC input source uinPositive pole, power switch S3The source electrodes are respectively connected with an inductor L31One terminal, capacitor C31One terminal, capacitor C31The other ends are respectively connected with an inductor L32One terminal, diode D3Cathode, diode D3Anode connected capacitor C32One terminal, capacitor C32The other end is connected with an inductor L32Another terminal, inductor L31The other end is connected with a grounding end;
the two ends of the load R are respectively connected with a capacitor C1One terminal, capacitor C32And the other end.
4. The single-input high-reliability capacitance-current uniform Buck-boost DC-DC converter according to claim 3, characterized in that: when the gain expansion unit is equal to 2, when the inductor current is continuously conducted, the circuit can be divided into 2 working states according to different power switches:
(1): power switch S1、S2And S3Conducting, diode D1、D2、D3All are turned off; inductor L1、L21、L22、L31、L31The terminal voltage is shown as follows:
Figure FDA0003242356990000031
(2): power switch S1、S2And S3Turn-off, diode D1、D2、D3All are turned on; inductor L1、L21、L22、L31、L31The terminal voltage is shown as follows:
Figure FDA0003242356990000032
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115051563A (en) * 2022-06-15 2022-09-13 三峡大学 Multi-time ultrahigh voltage gain DC-DC converter

Citations (3)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115051563A (en) * 2022-06-15 2022-09-13 三峡大学 Multi-time ultrahigh voltage gain DC-DC converter
CN115051563B (en) * 2022-06-15 2024-06-11 三峡大学 Multiple ultra-high voltage gain DC-DC converter

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