CN113890341A - Multi-input high-reliability Sepic DC-DC converter - Google Patents

Multi-input high-reliability Sepic DC-DC converter Download PDF

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Publication number
CN113890341A
CN113890341A CN202111038863.4A CN202111038863A CN113890341A CN 113890341 A CN113890341 A CN 113890341A CN 202111038863 A CN202111038863 A CN 202111038863A CN 113890341 A CN113890341 A CN 113890341A
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capacitor
inductor
diode
gain expansion
expansion unit
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Inventor
邾玢鑫
周丽娟
刘佳欣
杨浴金
杨楠
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China Three Gorges University CTGU
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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 multi-input high-reliability Sepic DC-DC converter comprises n +1 direct-current input power supplies, a basic Sepic converter and n gain expansion units. The gain expansion unit is composed of two inductors, two capacitors, a power switch and a diode. The input and output gains of the converter and the voltage stress of the switching device can be adjusted 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 one switching tube is damaged, other circuits can work normally; the power supply is suitable for application occasions where the variation range of the output and input voltage and the output voltage is large, a plurality of power supplies are required to supply power simultaneously, and the requirement on reliability is high.

Description

Multi-input high-reliability Sepic DC-DC converter
Technical Field
The invention relates to a DC-DC converter, in particular to a double-input high-reliability Sepic DC-DC converter.
Background
In the application occasions with large input and output voltage changes, the input voltage can be higher than the output voltage or lower than the output voltage, and the common non-isolated Buck-Boost DC-DC converter suitable for the application occasions comprises Buck-Boost circuits, Cuk circuits, Sepic circuits 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, basic circuits are mostly adopted to be constructed in parallel in the scheme of input and output gains of the double-input DC-DC converter, but the reliability is poor. Therefore, the research on the multi-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 multi-input high-gain DC-DC converter is low in reliability is solved. The invention provides a multi-input high-reliability Sepic DC-DC converter based on a basic Sepic converter, which consists of the basic Sepic converter and a plurality of gain expansion units. The input and output gains of the converter and the voltage stress of the switching device can be adjusted 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 of the switching tubes is damaged, other circuits can work normally; is suitable for application occasions with larger variation range of output and input voltage and output voltage, need of simultaneously supplying power by a plurality of power supplies and high reliability requirement
The technical scheme adopted by the invention is as follows:
a multi-input high reliability Sepic DC-DC converter, the converter comprising:
n +1 direct current power supplies, a basic Sepic converter, n gain expansion units, wherein:
the basic Sepic converter comprising an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1(ii) a Wherein:
inductor L1One end is connected with a direct current power supply uin1Positive electrode, inductor L1The other ends are respectively connected with a power switch S1Drain electrode, capacitor C1One terminal, capacitor C1The other ends are respectively connected with an inductor L2One terminal, diode D1Anode, diode D1Cathode connection capacitor C2One terminal, capacitor C2Another terminal, an inductance L2The other end, power switch S1The source electrodes are all connected to a DC power supply uin1A negative electrode;
the 1 st gain expansion unit comprises an inductor L11、L12Capacitor C11、C12Power switch S2Diode D11(ii) a Wherein: inductor L11One end is connected with a direct current power supply uin2Positive electrode, inductor L11The other ends are respectively connected with a power switch S2Drain electrode, capacitor C11One terminal, capacitor C11The other ends are respectively connected with an inductor L12One terminal, diode D11Anode, diode D11Cathode connection capacitor C12One terminal, power switch S2Source connected to DC power supply uin2A negative electrode;
the 2 nd gain expansion unit comprises an inductor L21、L22Capacitor C21、C22Power switch S3Diode D21(ii) a Wherein: inductor L21One end is connected with a direct current power supply uin3Positive electrode, inductor L21The other ends are respectively connected with a power switch S3Drain electrode, capacitor C21One terminal, capacitor C21The other ends are respectively connected with an inductor L22One terminal, diode D21Anode, diode D21Cathode connection capacitor C22One terminal, power switch S3Source connected to DC power supply uin3A negative electrode;
.... and so on:
the nth gain expansion unit comprises an inductor Ln1、Ln2Capacitor Cn1、Cn2Power switch Sn+1A diode Dn1(ii) a Wherein: inductor Ln1One end is connected with a direct current power supply uin(n+1)Positive electrode, inductor Ln1The other ends are respectively connected with a power switch Sn+1Drain electrode, capacitor Cn1One terminal, capacitor Cn1The other ends are respectively connected with an inductor Ln2One terminal, diode Dn1Anode, diode Dn1Cathode connection capacitor Cn2One terminal, power switch Sn+1Source connected to DC power supply uin(n+1)A negative electrode;
the connection relationship between the 1 st gain expansion unit and the basic Sepic converter is as follows:
inductance L in the 1 st gain expansion unit12The other end is connected with a diode D in the basic Sepic converter1Cathode, capacitor C in the 1 st gain expansion cell12The other end is connected with a capacitor C in the basic Sepic converter2The other end;
DC power supply uin1The negative electrodes are respectively connected with a direct current power supply uin2Negative electrode, DC power supply uin3DC power supply uin(n+1)A negative electrode;
the connection relationship between the gain expansion units is as follows:
diode D in the 1 st gain expansion unit11The negative pole is connected with the inductor L in the 2 nd gain expansion unit22The other end of the first tube is provided with a first end,
capacitance C in the 1 st gain expansion unit12The other end is connected with a capacitor C in the 2 nd gain expansion unit22The other end;
diode D in the 2 nd gain expansion unit21The negative pole is connected with an inductor L in the 3 rd gain expansion unit32The other end of the first tube is provided with a first end,
capacitance C in the 2 nd gain expansion unit22The other end is connected with a capacitor C in the 3 rd gain expansion unit32The other end;
.... and so on:
diode D in the (n-1) th gain expansion unit(n-1)1The negative pole is connected with the inductor L in the nth gain expansion unitn2The other end of the first tube is provided with a first end,
in the (n-1) th gain expansion unitCapacitor C(n-1)2The other end is connected with a capacitor C in the nth gain expansion unitn2The other end;
one end of a load R is connected with a capacitor C in the nth gain expansion unitn2One end of the load R and the other end of the load R are connected with a capacitor C in the basic Sepic converter2And the other end.
The power switch S1And S2、S3、…、Sn+1The gates of (a) are all connected to their controller, the duty cycle of which can be varied between 0 and 1, as is their S2、S3、…、Sn+1When any one of the switch tubes is damaged, the whole circuit can continue to work normally.
When the number of gain expansion units of the present invention is 2, the converter includes:
3 direct current power supplies, a basic Sepic converter, 2 gain expansion units, wherein:
the basic Sepic converter comprising an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1(ii) a Wherein:
inductor L1One end is connected with a direct current power supply uin1Positive electrode, inductor L1The other ends are respectively connected with a power switch S1Drain electrode, capacitor C1One terminal, capacitor C1The other ends are respectively connected with an inductor L2One terminal, diode D1Anode, diode D1Cathode connection capacitor C2One terminal, capacitor C2Another terminal, an inductance L2The other end, power switch S1The source electrodes are all connected to a DC power supply uin1A negative electrode;
the 1 st gain expansion unit comprises an inductor L11、L12Capacitor C11、C12Power switch S2Diode D11(ii) a Wherein: inductor L11One end is connected with a direct current power supply uin2Positive electrode, inductor L11The other ends are respectively connected with a power switch S2Drain electrode, capacitor C11One terminal, capacitor C11The other ends are respectively connected with an inductor L12One terminal, diode D11Anode, diode D11Cathode connection capacitor C12One terminal, power switch S2Source connected to DC power supply uin2A negative electrode;
the 2 nd gain expansion unit comprises an inductor L21、L22Capacitor C21、C22Power switch S3Diode D21(ii) a Wherein: inductor L21One end is connected with a direct current power supply uin3Positive electrode, inductor L21The other ends are respectively connected with a power switch S3Drain electrode, capacitor C21One terminal, capacitor C21The other ends are respectively connected with an inductor L22One terminal, diode D21Anode, diode D21Cathode connection capacitor C22One terminal, power switch S3Source connected to DC power supply uin3A negative electrode;
the connection relationship between the 1 st gain expansion unit and the basic Sepic converter is as follows:
inductance L in the 1 st gain expansion unit12The other end is connected with a diode D in the basic Sepic converter1Cathode, capacitor C in the 1 st gain expansion cell12The other end is connected with a capacitor C in the basic Sepic converter2The other end;
DC power supply uin1The negative electrodes are respectively connected with a direct current power supply uin2Negative electrode, DC power supply uin3A negative electrode;
the connection relationship between the 2 gain expansion units is as follows:
diode D in the 1 st gain expansion unit11The negative pole is connected with the inductor L in the 2 nd gain expansion unit22The other end of the first tube is provided with a first end,
capacitance C in the 1 st gain expansion unit12The other end is connected with a capacitor C in the 2 nd gain expansion unit22The other end;
one end of a load R is connected with a capacitor C in the 2 nd gain expansion unit22One end of the load R and the other end of the load R are connected with a capacitor C in the basic Sepic converter2And the other end.
The invention discloses a multi-input high-reliability Sepic DC-DC converter, which has the following technical effects:
1) the buck-boost can be realized simultaneously, the input and output gains are high, and the output capacitors are connected in series and share voltage. Inductor L1、L11、......、Ln1When the current of (2) is continuously conducted, the following is concrete:
when u isin1＝uin2＝...＝uinnWhen the temperature of the water is higher than the set temperature,
Figure BDA0003248312380000041
the voltage stress of the switching tube is as follows:
Figure BDA0003248312380000042
the voltage on the output capacitor is:
Figure BDA0003248312380000043
wherein: d is the duty cycle, uin1、uin2、…、uinn、uin(n+1)Is an input voltage uS1、uS2、…、uSn、uS(n+1)For power switch voltage stress, n is the number of gain expansion cells.
2) When one switch tube of the n gain expansion units is damaged, the other 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 Sepic converter circuit.
Fig. 3 is a circuit topology diagram of the present invention with a gain expansion unit number of 2.
Fig. 4 is a graph comparing the input/output gain of the present invention with the input/output gain of the conventional Sepic 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 number of gain expansion units 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 according to the present invention, the input voltage is 30V, the number of gain expansion units is 2, and D is 0.6.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 3 shows a circuit topology diagram when the number of gain expansion units is 2 according to the present invention:
a multi-input high-reliability Sepic DC-DC converter comprises 3 direct current input sources, a basic Sepic converter and 2 gain expansion units, wherein:
the basic Sepic converter comprises two inductors L1、L2Two capacitors C1、C2A power switch S1A diode D1(ii) a The connection form is as follows: inductor L1One end of is connected with a direct current power supply uin1Positive electrode of (1), inductor L1Are respectively connected with a power switch S1Drain electrode of (1) and capacitor C1One terminal of (C), a capacitor1The other end of the first and second inductors are respectively connected with the inductor L2And a diode D1Is connected to the anode of a diode D1Cathode and capacitor C2Are connected to one end of a power switch S1Source electrode and inductor L2And a capacitor C2And the other end of the DC input power uin1The negative electrodes are connected;
the first gain expansion unit comprises two inductors L11、L12Two capacitors C11、C12A power switch S2A diode D11(ii) a Wherein, the inductance L11One end of is connected with a direct current power supply uin2Positive electrode of (1), inductor L11Are respectively connected with a power switch S2Drain electrode of (1) and capacitor C11One terminal of (C), a capacitor11The other end of the first and second inductors are respectively connected with the inductor L12One terminal and diode D11Is connected to the anode of a diode D11Cathode and capacitor C12Are connected to one end of a power switch S2Source and dc input power uin2The negative electrodes are connected;
the second gain expansion unit comprises two inductors L21、L22Two capacitors C21、C22A power switch S3One diodePipe D21(ii) a Wherein, the inductance L21One end of is connected with a direct current power supply uin3Positive electrode of (1), inductor L21Are respectively connected with a power switch S3Drain electrode of (1) and capacitor C21One terminal of (C), a capacitor21The other end of the first and second inductors are respectively connected with the inductor L22And a diode D21Is connected to the anode of a diode D21Cathode and capacitor C22Are connected to one end of a power switch S3Source and dc input power uin3The negative electrodes are connected;
the connection relationship between the first gain expansion unit and the basic Sepic converter is as follows:
diode D in basic Sepic converter1Cathode and capacitor C2And the intersection point of one end of the first gain expansion unit and the inductor L in the first gain expansion unit12Is connected to the other end of the first capacitor, and a capacitor C in the basic Sepic converter2And the other end of the first gain expansion unit and a capacitor C in the first gain expansion unit12Is connected with the other end of the DC input power supply uin1Negative pole of (1) and DC input power uin2The negative electrodes are connected;
the connection between the two gain expansion units is as follows:
1 st gain expansion unit diode D11Cathode and capacitor C12And the intersection point of one end of the second gain expansion unit and the inductance L in the 2 nd gain expansion unit22Is connected to the other end of the 1 st gain expansion unit, a capacitor C in the 1 st gain expansion unit12And the other end of the second gain expansion unit and a capacitor C in the 2 nd gain expansion unit22Is connected with the other end of the DC input power supply uin2Negative pole of (1) and DC input power uin3The negative electrodes are connected;
one end of load R and capacitor C in basic Sepic converter2Is connected to the other end of the load R with the diode D in the second gain expansion unit21Cathode and capacitor C22Are connected at the intersection point where one end of the two ends are connected.
Power switch S1、S2、S3The gate of (a) is connected to its controller, and its duty cycle can be varied between 0 and 1. On-off switch capable of controlling power switch by saving duty ratioAnd the off time can be used for adjusting the output voltage level according to a voltage balance formula of the inductor.
At the inductor L1、L11、L21When the current is continuously conducted, the circuit can be divided into 2 working states according to different power switch states:
(1) power switch S1、S2、S3Conducting, diode D1、D11、D21Are all turned off, at the moment, the inductance L1、L11、L21Charging, inductance L2、L12、L22Capacitor C1、C2、C11、C12、C22And (4) discharging. Inductor L1、L2、L11、L12、L21、L22The terminal voltages are as follows:
Figure BDA0003248312380000061
(2) power switch S1、S2、S3Turn-off, diode D1、D11、D21Are all conducted, at this moment, the inductance L2、L12、L22Capacitor C1、C2、C11、C12、C22Charging, inductance L1、L11、L21And (4) discharging. Inductor L1、L2、L11、L12、L21、L22The terminal voltages are as follows:
Figure BDA0003248312380000071
according to the connection at the power switch S1、S2、S3The duty cycle of the controller on the gate, the voltage level on each capacitor can be derived as follows:
Figure BDA0003248312380000072
fig. 4 is a graph comparing the input/output gain of the present invention with the input/output gain of the conventional Sepic converter when the number of gain expansion units is 2. As can be seen from fig. 4, the gain of the proposed converter is three times that of the conventional converter when the duty ratio is the same.
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 according to the present invention, the input voltage is 30V, the number of gain expansion units is 2, and D is 0.6.

Claims (4)

1. A multi-input high-reliability Sepic DC-DC converter is characterized by comprising:
n +1 direct current power supplies, a basic Sepic converter, n gain expansion units, wherein:
the basic Sepic converter comprising an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1(ii) a Wherein:
inductor L1One end is connected with a direct current power supply uin1Positive electrode, inductor L1The other ends are respectively connected with a power switch S1Drain electrode, capacitor C1One terminal, capacitor C1The other ends are respectively connected with an inductor L2One terminal, diode D1Anode, diode D1Cathode connection capacitor C2One terminal, capacitor C2Another terminal, an inductance L2The other end, power switch S1The source electrodes are all connected to a DC power supply uin1A negative electrode;
the 1 st gain expansion unit comprises an inductor L11、L12Capacitor C11、C12Power switch S2Diode D11(ii) a Wherein: inductor L11One end is connected with a direct current power supply uin2Positive electrode, inductor L11The other ends are respectively connected with a power switch S2Drain electrode, capacitor C11One terminal, capacitor C11The other ends are respectively connected with an inductor L12One terminal, diode D11Anode, diode D11Cathode connection capacitor C12One terminal, power switch S2Source connected to DC power supply uin2A negative electrode;
the 2 nd gain expansion unit comprises an inductor L21、L22Capacitor C21、C22Power switch S3Diode D21(ii) a Wherein: inductor L21One end is connected with a direct current power supply uin3Positive electrode, inductor L21The other ends are respectively connected with a power switch S3Drain electrode, capacitor C21One terminal, capacitor C21The other ends are respectively connected with an inductor L22One terminal, diode D21Anode, diode D21Cathode connection capacitor C22One terminal, power switch S3Source connected to DC power supply uin3A negative electrode;
.... and so on:
the nth gain expansion unit comprises an inductor Ln1、Ln2Capacitor Cn1、Cn2Power switch Sn+1A diode Dn1(ii) a Wherein: inductor Ln1One end is connected with a direct current power supply uin(n+1)Positive electrode, inductor Ln1The other ends are respectively connected with a power switch Sn+1Drain electrode, capacitor Cn1One terminal, capacitor Cn1The other ends are respectively connected with an inductor Ln2One terminal, diode Dn1Anode, diode Dn1Cathode connection capacitor Cn2One terminal, power switch Sn+1Source connected to DC power supply uin(n+1)A negative electrode;
the connection relationship between the 1 st gain expansion unit and the basic Sepic converter is as follows:
inductance L in the 1 st gain expansion unit12The other end is connected with a diode D in the basic Sepic converter1Cathode, capacitor C in the 1 st gain expansion cell12The other end is connected with a capacitor C in the basic Sepic converter2The other end;
DC power supply uin1The negative electrodes are respectively connected with a direct current power supply uin2Negative electrode, direct currentSource uin3DC power supply uin(n+1)A negative electrode;
the connection relationship between the gain expansion units is as follows:
diode D in the 1 st gain expansion unit11The negative pole is connected with the inductor L in the 2 nd gain expansion unit22The other end of the first tube is provided with a first end,
capacitance C in the 1 st gain expansion unit12The other end is connected with a capacitor C in the 2 nd gain expansion unit22The other end;
diode D in the 2 nd gain expansion unit21The negative pole is connected with an inductor L in the 3 rd gain expansion unit32The other end of the first tube is provided with a first end,
capacitance C in the 2 nd gain expansion unit22The other end is connected with a capacitor C in the 3 rd gain expansion unit32The other end;
.... and so on:
diode D in the (n-1) th gain expansion unit(n-1)1The negative pole is connected with the inductor L in the nth gain expansion unitn2The other end of the first tube is provided with a first end,
capacitance C in the (n-1) th gain expansion unit(n-1)2The other end is connected with a capacitor C in the nth gain expansion unitn2The other end;
one end of a load R is connected with a capacitor C in the nth gain expansion unitn2One end of the load R and the other end of the load R are connected with a capacitor C in the basic Sepic converter2And the other end.
2. The multi-input high-reliability Sepic DC-DC converter according to claim 1, characterized in that: the power switch S1And S2、S3、…、Sn+1The gates of (a) are all connected to their controller, the duty cycle of which can be varied between 0 and 1, as is their S2、S3、…、Sn+1When any one of the switch tubes is damaged, the whole circuit can continue to work normally.
3. A multi-input high-reliability Sepic DC-DC converter is characterized in that: the converter includes:
3 direct current power supplies, a basic Sepic converter, 2 gain expansion units, wherein:
the basic Sepic converter comprising an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1(ii) a Wherein:
inductor L1One end is connected with a direct current power supply uin1Positive electrode, inductor L1The other ends are respectively connected with a power switch S1Drain electrode, capacitor C1One terminal, capacitor C1The other ends are respectively connected with an inductor L2One terminal, diode D1Anode, diode D1Cathode connection capacitor C2One terminal, capacitor C2Another terminal, an inductance L2The other end, power switch S1The source electrodes are all connected to a DC power supply uin1A negative electrode;
the 1 st gain expansion unit comprises an inductor L11、L12Capacitor C11、C12Power switch S2Diode D11(ii) a Wherein: inductor L11One end is connected with a direct current power supply uin2Positive electrode, inductor L11The other ends are respectively connected with a power switch S2Drain electrode, capacitor C11One terminal, capacitor C11The other ends are respectively connected with an inductor L12One terminal, diode D11Anode, diode D11Cathode connection capacitor C12One terminal, power switch S2Source connected to DC power supply uin2A negative electrode;
the 2 nd gain expansion unit comprises an inductor L21、L22Capacitor C21、C22Power switch S3Diode D21(ii) a Wherein: inductor L21One end is connected with a direct current power supply uin3Positive electrode, inductor L21The other ends are respectively connected with a power switch S3Drain electrode, capacitor C21One terminal, capacitor C21The other ends are respectively connected with an inductor L22One terminal, diode D21Anode, diode D21Cathode connection capacitor C22One terminal, power switch S3Source connected to DC power supply uin3A negative electrode;
the connection relationship between the 1 st gain expansion unit and the basic Sepic converter is as follows:
inductance L in the 1 st gain expansion unit12The other end is connected with a diode D in the basic Sepic converter1Cathode, capacitor C in the 1 st gain expansion cell12The other end is connected with a capacitor C in the basic Sepic converter2The other end;
DC power supply uin1The negative electrodes are respectively connected with a direct current power supply uin2Negative electrode, DC power supply uin3A negative electrode;
the connection relationship between the 2 gain expansion units is as follows:
diode D in the 1 st gain expansion unit11The negative pole is connected with the inductor L in the 2 nd gain expansion unit22The other end of the first tube is provided with a first end,
capacitance C in the 1 st gain expansion unit12The other end is connected with a capacitor C in the 2 nd gain expansion unit22The other end;
one end of a load R is connected with a capacitor C in the 2 nd gain expansion unit22One end of the load R and the other end of the load R are connected with a capacitor C in the basic Sepic converter2And the other end.
4. The multi-input high-reliability Sepic DC-DC converter according to claim 3, characterized in that:
the number of gain expansion units is 2, and the inductance L1、L11、L21When the current is continuously conducted, the circuit can be divided into 2 working states according to different power switch states:
(1) power switch S1、S2、S3Conducting, diode D1、D11、D21Are all turned off, at the moment, the inductance L1、L11、L21Charging, inductance L2、L12、L22Capacitor C1、C2、C11、C12、C22Discharging; inductor L1、L2、L11、L12、L21、L22Terminal electricThe pressure is as follows:
(2)
Figure FDA0003248312370000041
(3) power switch S1、S2、S3Turn-off, diode D1、D11、D21Are all conducted, at this moment, the inductance L2、L12、L22Capacitor C1、C2、C11、C12、C22Charging, inductance L1、L11、L21Discharging; inductor L1、L2、L11、L12、L21、L22The terminal voltages are as follows:
Figure FDA0003248312370000042
CN202111038863.4A 2021-09-06 2021-09-06 Multi-input high-reliability Sepic DC-DC converter Pending CN113890341A (en)

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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

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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