CN113965083A - Double-input high-reliability Cuk DC-DC converter - Google Patents

Double-input high-reliability Cuk DC-DC converter Download PDF

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Publication number
CN113965083A
CN113965083A CN202111183338.1A CN202111183338A CN113965083A CN 113965083 A CN113965083 A CN 113965083A CN 202111183338 A CN202111183338 A CN 202111183338A CN 113965083 A CN113965083 A CN 113965083A
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capacitor
inductor
diode
terminal
extension unit
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Inventor
邾玢鑫
刘佳欣
赵宇辉
周生奇
支树播
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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
    • H02M3/158—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 including plural semiconductor devices as final control devices for a single load
    • 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
    • H02M3/005—Conversion of dc power input into dc power output using Cuk 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
    • 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
    • H02M3/157—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 with digital control

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A dual-input high-reliability Cuk DC-DC converter comprises two direct current input sources, a basic Cuk converter, a basic Sepic converter,ma forward direction extension unit for the forward direction extension unit,nand a reverse voltage extension unit. The forward and reverse extension units are composed of an inductor, two capacitors and a diode, and the adjustment of the input and output gains of the converter and the voltage stress of the switching device can be realized by adjusting the number of the forward and reverse extension 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; the power supply is suitable for application occasions where the variation range of the output-input voltage and the output voltage is large, two power supplies are required to supply power simultaneously, and the requirement on reliability is high.

Description

Double-input high-reliability Cuk DC-DC converter
Technical Field
The invention relates to a DC-DC converter, in particular to a dual-input high-reliability Cuk 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 double-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 an existing non-isolated type double-input high-gain DC-DC converter is low in reliability is solved. The invention provides a double-input high-reliability Cuk DC-DC converter based on a basic Cuk converter, which consists of the basic Cuk converter, a 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; the power supply is suitable for application occasions where the variation range of the output input voltage and the output voltage is large, two power supplies are required to supply power simultaneously, and the requirement on reliability is high.
The technical scheme adopted by the invention is as follows:
a dual-input high-reliability Cuk DC-DC converter comprises two direct current input sources, a basic Cuk converter, a basic Sepic converter, m positive expansion units and n negative expansion units; wherein:
the basic Cuk converter comprises an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1(ii) a InductanceL1One end of the first switch is connected with a direct current input source uin1Positive electrode of (1), inductor L1Are respectively connected with a power switch S1Drain electrode of (1), capacitor C1One terminal of (C), a capacitor1Are respectively connected with an inductor L at the other end2One terminal of (1), diode D1Anode of (2), inductor L2The other end of the capacitor C is connected with a capacitor C2One terminal of (1), power switch S1Source electrode of (2), diode D1And a capacitor C2The other ends of the two are connected with a direct current input source uin1The negative electrode of (1);
the basic Sepic converter comprising an inductor L3、L4Capacitor C3、C4Power switch S2Diode D2(ii) a Inductor L3One end of the first switch is connected with a direct current input source uin2Positive electrode of (1), inductor L3Are respectively connected with a power switch S2Drain electrode of (1), capacitor C3One terminal of (C), a capacitor3Are respectively connected with an inductor L at the other end4One terminal of (1), diode D2Anode of (2), inductor L4The other end of the capacitor C is connected with a capacitor C4One end of (1), a DC input source uin2Negative electrode of (2), power switch S2Source electrode of (1), capacitor C4Another end of the diode D2A cathode of (a);
DC input source u of basic Cuk converterin1Negative pole of the basic Sepic converter is connected with a direct current input source uin2Negative pole of (1), capacitor C in basic Cuk converter2The other end of the first and second switches is connected with a capacitor C in a basic Sepic converter4One end of (a);
m forward extension units:
the 1 st forward extension unit comprises an inductor LM11Diode DM11Capacitor CM11、CM12(ii) a Wherein, the capacitor CM11Are respectively connected with a diode DM11Anode of (2), inductor LM11One terminal of (1), inductance LM11The other end of the capacitor C is connected with a capacitor CM12One terminal of (C), a capacitorM12Another end of the diode DM11A cathode of (a);
2 nd forward expansionThe display unit comprises an inductor LM21Diode DM21Capacitor CM21、CM22(ii) a Wherein, the capacitor CM21Are respectively connected with a diode DM21Anode, inductor LM21One terminal of (1), inductance LM21The other end of the capacitor C is connected with a capacitor CM22One terminal of (C), a capacitorM22Another end of the diode DM21A cathode of (a);
.... times, in the ith forward extension unit, 1< i ≦ m,
the ith forward extension unit comprises an inductor LMi1Diode DMi1Capacitor CMi1、CMi2(ii) a Wherein, the capacitor CMi1Are respectively connected with a diode DMi1Anode of (2), inductor LMi1One terminal of (1), inductance LMi1The other end of the capacitor C is connected with a capacitor CMi2One terminal of (C), a capacitorMi2Another end of the diode DMi1A cathode of (a);
capacitance C in the 1 st forward extension unitM11One terminal of which is connected to the capacitor C in the basic Cuk converter1The other end of (1) th forward extension unit, a capacitor CM12The other end of the first capacitor is connected with a capacitor C in the basic Cuk converter2One end of (a);
capacitor C in 2 nd forward extension unitM21Is connected with the capacitor C in the 1 st forward extension unitM11The other end of (2) the capacitor C in the forward extension unitM22Is connected with the capacitor C in the 1 st forward extension unitM12One end of (a);
.... analogized in turn;
capacitance C in ith forward extension unitMi1One end of the positive extension unit is connected with a capacitor C in the (i-1) th positive extension unitM(i-1)1The other end of (1), a capacitor C in the ith forward extension unitMi2The other end of the positive extension unit is connected with a capacitor C in the (i-1) th positive extension unitM(i-1)2And the other end of the same.
n negative-going extension units:
the 1 st negative direction extension unit comprises an inductor LN11Diode DN11Capacitor CN11、CN12(ii) a Capacitor CN11Are respectively connected with an inductor L at the other endN11One terminal of (1), diode DN11Anode of (2), inductor LN11The other end of the capacitor C is connected with a capacitor CN12One terminal of (C), a capacitorN12Another end of the diode DN11A cathode of (a);
the 2 nd negative direction extension unit comprises an inductor LN21Diode DN21Capacitor CN21、CN22(ii) a Wherein, the capacitor CN21Are respectively connected with an inductor L at the other endN21One terminal of (1), diode DN21Anode of (2), inductor LN21The other end of the capacitor C is connected with a capacitor CN22One terminal of (C), a capacitorN22Another end of the diode DN21A cathode of (a);
.... analogize in turn, the j-th negative voltage expansion unit, 1< j ≦ n,
the jth negative voltage extension unit comprises an inductor LNj1Diode DNj1Capacitor CNj1、CNj2(ii) a Wherein, the capacitor CNj1Are respectively connected with an inductor L at the other endNj1One terminal of (1), diode DNj1Anode of (2), inductor LNj1The other end of the capacitor C is connected with a capacitor CNj2One terminal of (C), a capacitorNj2Another end of the diode DNj1A cathode of (a);
capacitance C in the 1 st negative extension cellN11One end of the capacitor C is connected with the basic Sepic converter3The other end of (1), the capacitance C in the 1 st negative-going extension cellN12One end of the first half-bridge is connected with a capacitor C in a basic Sepic converter4The other end of (a);
capacitance C in the 2 nd negative extension cellN21One end of the negative extension unit is connected with the capacitor C in the 1 st negative extension unitN11On the other end, the capacitance C in the 2 nd negative extension cellN22Is connected to the capacitor C in the 1 st negative extensionN12The other end of (a);
.... analogized in turn;
capacitance C in jth negative-going extension cellNj1One end of the negative direction extension unit is connected with the j-1 th negative direction extension unitCapacitor C ofN(j-1)1The other end, the capacitance C in the jth negative extension cellNj2One end of the negative-going extension unit is connected with the capacitor C in the (j-1) th negative-going extension unitN(j-1)2The other end of (a);
one end of a load R is connected with a capacitor C in the mth forward extension unitMm2The other end of the load R is connected with the capacitor C in the nth negative direction extension unitNn2And the other end of the same.
The power switch S1And S2The duty ratio of the grid electrode is variable between 0 and 1 when the switching tube S is switched on and off1Or S2When damaged, the whole circuit can continue to work normally.
When the number of expansion units is 1, and n is 1, the converter comprises two direct current input sources, a basic Cuk converter, a basic Sepic converter, m positive expansion units and n negative expansion units; wherein:
the basic Cuk converter comprises an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1(ii) a Inductor L1One end of the first switch is connected with a direct current input source uin1Positive electrode of (1), inductor L1Are respectively connected with a power switch S1Drain electrode of (1), capacitor C1One terminal of (C), a capacitor1Are respectively connected with an inductor L at the other end2One terminal of (1), diode D1Anode of (2), inductor L2The other end of the capacitor C is connected with a capacitor C2One terminal of (1), power switch S1Source electrode of (2), diode D1And a capacitor C2The other ends of the two are connected with a direct current input source uin1The negative electrode of (1);
the basic Sepic converter comprising an inductor L3、L4Capacitor C3、C4Power switch S2Diode D2(ii) a Inductor L3One end of the first switch is connected with a direct current input source uin2Positive electrode of (1), inductor L3Are respectively connected with a power switch S2Drain electrode of (1), capacitor C3One terminal of (C), a capacitor3Are respectively connected with an inductor L at the other end4One terminal of (1), diode D2Anode of (2), inductor L4The other end of the capacitor C is connected with a capacitor C4One end of (1), a DC input source uin2Negative electrode of (2), power switch S2Source electrode of (1), capacitor C4Another end of the diode D2A cathode of (a);
DC input source u of basic Cuk converterin1Negative pole of the basic Sepic converter is connected with a direct current input source uin2Negative pole of (1), capacitor C in basic Cuk converter2The other end of the first and second switches is connected with a capacitor C in a basic Sepic converter4One end of (a);
1 forward extension unit comprises an inductor LM11Diode DM11Capacitor CM11、CM12(ii) a Wherein, the capacitor CM11Are respectively connected with a diode DM11Anode of (2), inductor LM11One terminal of (1), inductance LM11The other end of the capacitor C is connected with a capacitor CM12One terminal of (C), a capacitorM12Another end of the diode DM11A cathode of (a);
capacitance C in 1 forward extension unitM11One terminal of which is connected to the capacitor C in the basic Cuk converter1The other end of (1) th forward extension unit, a capacitor CM12The other end of the first capacitor is connected with a capacitor C in the basic Cuk converter2One end of (a);
1 negative direction extension unit comprises an inductor LN11Diode DN11Capacitor CN11、CN12(ii) a Capacitor CN11Are respectively connected with an inductor L at the other endN11One terminal of (1), diode DN11Anode of (2), inductor LN11The other end of the capacitor C is connected with a capacitor CN12One terminal of (C), a capacitorN12Another end of the diode DN11A cathode of (a);
capacitance C in 1 negative extension unitN11One end of the capacitor C is connected with the basic Sepic converter3The other end of (1), the capacitance C in the 1 st negative-going extension cellN12One end of the first half-bridge is connected with a capacitor C in a basic Sepic converter4The other end of (a);
one end of a load R is connected with 1 forward extension unitCapacitor CM12The other end of the load R is connected with the capacitors C in the 1 negative direction extension unitN12And the other end of the same.
The invention discloses a dual-input high-reliability Cuk 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. Inductor L1And L3When the current of (2) is continuously conducted, the following is concrete:
when u isin1＝uin2The maximum input-output gain is:
Figure BDA0003298161840000051
the voltage stress of the switching tube is as follows:
Figure BDA0003298161840000052
the voltage on each output capacitor is:
Figure BDA0003298161840000053
wherein: d is the duty cycle, uin1And uin2Is an input voltage uoTo output a voltage us1And us2For the voltage stress of the power switch, m is the number of homopolar extension units, n is the number of reversed polarity extension units, 0<i≤m,0≤j≤n。
2) When power switch S1And S2When one of the switch tubes is damaged, 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 Cuk converter circuit.
Fig. 3 is a circuit topology diagram when the number of forward extension units is 1 and the number of reverse extension units is 1 according to the present invention.
Fig. 4 is a graph comparing the input and output gains of the conventional Cuk converter when the number of forward extension units is 1 and the number of backward extension units is 1 according to the present invention.
Fig. 5 is a simulation diagram of an output waveform when D is 0.6 when the input voltage is 30V, the number of forward extension units is 1, and the number of reverse extension units is 1 according to the present invention.
Fig. 6 is a simulation diagram of an output waveform when the switching tube S1 is broken when D is 0.6 when the input voltage is 30V, the number of forward extension units is 1, and the number of reverse extension units is 1 according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 3 shows a circuit topology when the number of extension units m is 1 and n is 1 according to the present invention:
a dual-input high-reliability Cuk circuit comprises two direct current input sources, a load, a basic Cuk converter, a basic Sepic circuit, 1 forward expansion unit and 1 reverse voltage expansion unit. Wherein:
the basic Cuk converter comprises two inductors L1、L2Two capacitors C1、C2A power switch S1A diode D1(ii) a The connection form is as follows: inductor L1Is connected with a DC input source 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 with the anode of the inductor L2Another terminal of (1) and a capacitor C2Are connected to one end of a power switch S1Source electrode of (2), diode D1Cathode and capacitor C2Another end of (1) and a DC input source uin1The negative electrodes are connected;
the basic Sepic converter comprises two inductors L3、L4Two capacitors C3、C4A power switch S2A diode D2(ii) a The connection form is as follows: inductor L3Is connected with a DC input source uin2Positive electrode of (1), inductor L3Are respectively connected with a power switch S2Drain electrode of (1) and capacitor C3One end of (1) is electrically connectedContainer C3The other end of the first and second inductors are respectively connected with the inductor L4And a diode D2Is connected to the anode of a diode D2Cathode and capacitor C4Are connected to one end of a power switch S1Source electrode and inductor L4Another terminal of (1) and a capacitor C4Another end of (1) and a DC input source uin2Are connected with each other.
The forward and reverse extension units all have the same internal structure, and taking the 1 st forward extension unit as an example, the forward extension unit comprises: an inductance LM11A diode DM11Two capacitors CM11、CM12(ii) a Wherein, the capacitor CM11The other end of the first and second inductors are respectively connected with the inductor LM11And a diode DM11Is connected with the anode of the inductor LM11Another terminal of (1) and a capacitor CM12Is connected to one terminal of a capacitor CM12Another terminal of (1) and a diode DM11Are connected to each other.
The connection relationship between the 1 st forward extension unit and the basic Cuk converter is as follows: capacitor C in basic Cuk converter1Another end of (1) and an inductor L2One end of the capacitor C is connected with the intersection point of the 1 st forward extension unitM11Is connected to one end of the inductor L in the basic Cuk converter2Another terminal of (1) and a capacitor C2One end of the diode is connected with a diode D in the 1 st forward extension unitM11Cathode and capacitor CM12The other ends are connected with each other at the intersection point.
The connection relationship between the 1 st negative direction expansion unit and the basic Sepic converter is as follows: capacitor C in basic Sepic converter3Another end of (1) and an inductor L4And the intersection point of the one end of the negative extension unit and the capacitor C in the 1 st negative extension unitN11Is connected at one end, diode D in basic Sepic converter2Cathode and capacitor C4And the intersection point of the other end of the first negative direction extension unit and the inductance L in the 1 st negative direction extension unitN11Another terminal of (1) and a capacitor CN12Are connected at the intersection point where one ends of the two are connected.
The connection relationship between the basic Cuk converter and the basic Sepic converter is as follows: DC input source u of basic Cuk converterin1Of the negative electrodeDC input source u to basic Sepic converterin2Is connected in parallel to ground, a capacitor C in the basic Cuk converter2And diode cathode D1Inductance L of basic Sepic converter connected with intersection point4Another terminal of (1) and a capacitor C4Are connected at the intersection point where one ends of the two are connected.
One end of a load R and a capacitor C in the 1 st forward extension unitM12One end of (1) and an inductor LM11The other end of the load R is connected with the capacitor C in the 1 st negative direction extension unitN12Another terminal of (1) and a diode DN11Are connected at the intersection point where the cathodes are connected.
The gates of power switches S1 and S2 are connected to their controllers, and their duty cycles can be varied from 0 to 1. The on-off time of the power switches S1 and S2 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.
At the inductor L1And L3When the current is continuously conducted, the circuit can be divided into 3 working states according to different power switch states:
(1): power switch S1And S2Conducting, diode D1、D2、DM11、DN11Are all turned off, at the moment, the inductance L1、L2、L3、L4、LM11、LN11Capacitor C2、CM12、CN11Charging, capacitance C1、CM11、C3、C4、CN12Discharging; inductor L1、L2、L3、L4、LM11、LN11The terminal voltage is shown as follows:
Figure BDA0003298161840000071
(2): power switch S1And S2Diode D1And D2Turn-off, diode DM11And DN11Conduction at this time, the inductance L1、L2、L3、L4、LM11、LN11Capacitor C2、CM12、CN11Discharge, capacitance C1、CM11、C3、C4、CN12Charging; inductor L1、L2、L3、L4、LM11、LN11The terminal voltage is shown as follows:
Figure BDA0003298161840000081
(3): power switch S1And S2Turn-off, diode D1、D2、DM11、DN11Are all conducted, at this moment, the inductance L1、L2、L3、L4、LM11、LN11Capacitor C2、CM11、CM12、CN11Discharge, capacitance C1、C3、C4、CN12Charging; inductor L1、L2、L3、L4、LM11、LN11The terminal voltage is shown as follows:
Figure BDA0003298161840000082
from the duty cycles of the controllers connected to the gates of the power switches S1 and S2, the voltage levels across each capacitor can be derived as follows:
Figure BDA0003298161840000083
fig. 4 is a graph comparing the input and output gains of the conventional Cuk converter when the number of forward extension units is 1 and the number of backward extension units is 1 according to the present invention. As can be seen from fig. 4, the gain of the proposed converter is four times that of the conventional converter at the same duty cycle.
Fig. 5 is a simulation diagram of an output waveform when D is 0.6 when the input voltage is 30V, the number of forward extension units is 1, and the number of reverse extension units is 1 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 S1 is broken when D is 0.6 when the input voltage is 30V, the number of forward extension units is 1, and the number of reverse extension units is 1 according to the present invention. The simulation verifies the reliability of the invention.

Claims (4)

1. A dual-input high-reliability Cuk DC-DC converter is characterized in that: the converter comprises two direct current input sources, a basic Cuk converter, a basic Sepic converter, m positive expansion units and n negative expansion units; wherein:
the basic Cuk converter comprises an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1(ii) a Inductor L1One end of the first switch is connected with a direct current input source uin1Positive electrode of (1), inductor L1Are respectively connected with a power switch S1Drain electrode of (1), capacitor C1One terminal of (C), a capacitor1Are respectively connected with an inductor L at the other end2One terminal of (1), diode D1Anode of (2), inductor L2The other end of the capacitor C is connected with a capacitor C2One terminal of (1), power switch S1Source electrode of (2), diode D1And a capacitor C2The other ends of the two are connected with a direct current input source uin1The negative electrode of (1);
the basic Sepic converter comprising an inductor L3、L4Capacitor C3、C4Power switch S2Diode D2(ii) a Inductor L3One end of the first switch is connected with a direct current input source uin2Positive electrode of (1), inductor L3Are respectively connected with a power switch S2Drain electrode of (1), capacitor C3One terminal of (C), a capacitor3Are respectively connected with an inductor L at the other end4One terminal of (1), diode D2Anode of (2), inductor L4The other end of the capacitor C is connected with a capacitor C4One end of (1), a DC input source uin2Negative electrode of (2), power switch S2Source electrode of (1), capacitor C4Another end of the diode D2A cathode of (a);
DC input source u of basic Cuk converterin1Negative pole of the basic Sepic converter is connected with a direct current input source uin2Negative pole of (1), capacitor C in basic Cuk converter2The other end of the first and second switches is connected with a capacitor C in a basic Sepic converter4One end of (a);
m forward extension units:
the 1 st forward extension unit comprises an inductor LM11Diode DM11Capacitor CM11、CM12(ii) a Wherein, the capacitor CM11Are respectively connected with a diode DM11Anode of (2), inductor LM11One terminal of (1), inductance LM11The other end of the capacitor C is connected with a capacitor CM12One terminal of (C), a capacitorM12Another end of the diode DM11A cathode of (a);
the 2 nd forward extension unit comprises an inductor LM21Diode DM21Capacitor CM21、CM22(ii) a Wherein, the capacitor CM21Are respectively connected with a diode DM21Anode, inductor LM21One terminal of (1), inductance LM21The other end of the capacitor C is connected with a capacitor CM22One terminal of (C), a capacitorM22Another end of the diode DM21A cathode of (a);
.... times, in the ith forward extension unit, 1< i ≦ m,
the ith forward extension unit comprises an inductor LMi1Diode DMi1Capacitor CMi1、CMi2(ii) a Wherein, the capacitor CMi1Are respectively connected with a diode DMi1Anode of (2), inductor LMi1One terminal of (1), inductance LMi1The other end of the capacitor C is connected with a capacitor CMi2One terminal of (C), a capacitorMi2Another end of the diode DMi1A cathode of (a);
capacitance C in the 1 st forward extension unitM11One terminal of which is connected to the capacitor C in the basic Cuk converter1The other end of (1) th forward extension unit, a capacitor CM12The other end of the first capacitor is connected with a capacitor C in the basic Cuk converter2One end of (a);
capacitor C in 2 nd forward extension unitM21Is connected with the capacitor C in the 1 st forward extension unitM11The other end of (2) the capacitor C in the forward extension unitM22Is connected with the capacitor C in the 1 st forward extension unitM12One end of (a);
.... analogized in turn;
capacitance C in ith forward extension unitMi1One end of the positive extension unit is connected with a capacitor C in the (i-1) th positive extension unitM(i-1)1The other end of (1), a capacitor C in the ith forward extension unitMi2The other end of the positive extension unit is connected with a capacitor C in the (i-1) th positive extension unitM(i-1)2The other end of (a);
n negative-going extension units:
the 1 st negative direction extension unit comprises an inductor LN11Diode DN11Capacitor CN11、CN12(ii) a Capacitor CN11Are respectively connected with an inductor L at the other endN11One terminal of (1), diode DN11Anode of (2), inductor LN11The other end of the capacitor C is connected with a capacitor CN12One terminal of (C), a capacitorN12Another end of the diode DN11A cathode of (a);
the 2 nd negative direction extension unit comprises an inductor LN21Diode DN21Capacitor CN21、CN22(ii) a Wherein, the capacitor CN21Are respectively connected with an inductor L at the other endN21One terminal of (1), diode DN21Anode of (2), inductor LN21The other end of the capacitor C is connected with a capacitor CN22One terminal of (C), a capacitorN22Another end of the diode DN21A cathode of (a);
.... analogize in turn, the j-th negative voltage expansion unit, 1< j ≦ n,
the jth negative voltage extension unit comprises an inductor LNj1Diode DNj1Capacitor CNj1、CNj2(ii) a Wherein, the capacitor CNj1Are respectively connected with an inductor L at the other endNj1One terminal of (1), diode DNj1Anode of (2), inductor LNj1The other end of the capacitor C is connected with a capacitor CNj2One terminal of (C), a capacitorNj2In addition toOne end is connected with a diode DNj1A cathode of (a);
capacitance C in the 1 st negative extension cellN11One end of the capacitor C is connected with the basic Sepic converter3The other end of (1), the capacitance C in the 1 st negative-going extension cellN12One end of the first half-bridge is connected with a capacitor C in a basic Sepic converter4The other end of (a);
capacitance C in the 2 nd negative extension cellN21One end of the negative extension unit is connected with the capacitor C in the 1 st negative extension unitN11On the other end, the capacitance C in the 2 nd negative extension cellN22Is connected to the capacitor C in the 1 st negative extensionN12The other end of (a);
.... analogized in turn;
capacitance C in jth negative-going extension cellNj1One end of the negative extension unit is connected with the capacitor C in the (j-1) th negative extension unitN(j-1)1The other end, the capacitance C in the jth negative extension cellNj2One end of the negative-going extension unit is connected with the capacitor C in the (j-1) th negative-going extension unitN(j-1)2The other end of (a);
one end of a load R is connected with a capacitor C in the mth forward extension unitMm2The other end of the load R is connected with the capacitor C in the nth negative direction extension unitNn2And the other end of the same.
2. The dual-input high-reliability Cuk DC-DC converter according to claim 1, wherein: the power switch S1And S2The duty ratio of the grid electrode is variable between 0 and 1 when the switching tube S is switched on and off1Or S2When damaged, the whole circuit can continue to work normally.
3. A dual-input high-reliability Cuk DC-DC converter is characterized in that: the converter comprises two direct current input sources, a basic Cuk converter, a basic Sepic converter, m positive expansion units and n negative expansion units;
wherein:
the basic Cuk converter comprises an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1(ii) a Inductor L1One end of the first switch is connected with a direct current input source uin1Positive electrode of (1), inductor L1Are respectively connected with a power switch S1Drain electrode of (1), capacitor C1One terminal of (C), a capacitor1Are respectively connected with an inductor L at the other end2One terminal of (1), diode D1Anode of (2), inductor L2The other end of the capacitor C is connected with a capacitor C2One terminal of (1), power switch S1Source electrode of (2), diode D1And a capacitor C2The other ends of the two are connected with a direct current input source uin1The negative electrode of (1);
the basic Sepic converter comprising an inductor L3、L4Capacitor C3、C4Power switch S2Diode D2(ii) a Inductor L3One end of the first switch is connected with a direct current input source uin2Positive electrode of (1), inductor L3Are respectively connected with a power switch S2Drain electrode of (1), capacitor C3One terminal of (C), a capacitor3Are respectively connected with an inductor L at the other end4One terminal of (1), diode D2Anode of (2), inductor L4The other end of the capacitor C is connected with a capacitor C4One end of (1), a DC input source uin2Negative electrode of (2), power switch S2Source electrode of (1), capacitor C4Another end of the diode D2A cathode of (a);
DC input source u of basic Cuk converterin1Negative pole of the basic Sepic converter is connected with a direct current input source uin2Negative pole of (1), capacitor C in basic Cuk converter2The other end of the first and second switches is connected with a capacitor C in a basic Sepic converter4One end of (a);
1 forward extension unit comprises an inductor LM11Diode DM11Capacitor CM11、CM12(ii) a Wherein, the capacitor CM11Are respectively connected with a diode DM11Anode of (2), inductor LM11One terminal of (1), inductance LM11The other end of the capacitor C is connected with a capacitor CM12One terminal of (C), a capacitorM12Another end of the diode DM11A cathode of (a);
1 forward extension unitCapacitor C inM11One terminal of which is connected to the capacitor C in the basic Cuk converter1The other end of (1) th forward extension unit, a capacitor CM12The other end of the first capacitor is connected with a capacitor C in the basic Cuk converter2One end of (a);
1 negative direction extension unit comprises an inductor LN11Diode DN11Capacitor CN11、CN12(ii) a Capacitor CN11Are respectively connected with an inductor L at the other endN11One terminal of (1), diode DN11Anode of (2), inductor LN11The other end of the capacitor C is connected with a capacitor CN12One terminal of (C), a capacitorN12Another end of the diode DN11A cathode of (a);
capacitance C in 1 negative extension unitN11One end of the capacitor C is connected with the basic Sepic converter3The other end of (1), the capacitance C in the 1 st negative-going extension cellN12One end of the first half-bridge is connected with a capacitor C in a basic Sepic converter4The other end of (a);
one end of a load R is connected with a capacitor C in the 1 forward extension unitM12The other end of the load R is connected with the capacitors C in the 1 negative direction extension unitN12And the other end of the same.
4. The dual-input high-reliability Cuk DC-DC converter according to claim 3, wherein: when the number of expansion units m is 1 and n is 1, the inductance L is formed1And L3When the current is continuously conducted, the circuit can be divided into 3 working states according to different power switch states:
(1): power switch S1And S2Conducting, diode D1、D2、DM11、DN11Are all turned off, at the moment, the inductance L1、L2、L3、L4、LM11、LN11Capacitor C2、CM12、CN11Charging, capacitance C1、CM11、C3、C4、CN12Discharging; inductor L1、L2、L3、L4、LM11、LN11The terminal voltage is shown as follows:
Figure FDA0003298161830000051
(2): power switch S1And S2Diode D1And D2Turn-off, diode DM11And DN11Conduction at this time, the inductance L1、L2、L3、L4、LM11、LN11Capacitor C2、CM12、CN11Discharge, capacitance C1、CM11、C3、C4、CN12Charging; inductor L1、L2、L3、L4、LM11、LN11The terminal voltage is shown as follows:
Figure FDA0003298161830000052
(3): power switch S1And S2Turn-off, diode D1、D2、DM11、DN11Are all conducted, at this moment, the inductance L1、L2、L3、L4、LM11、LN11Capacitor C2、CM11、CM12、CN11Discharge, capacitance C1、C3、C4、CN12Charging; inductor L1、L2、L3、L4、LM11、LN11The terminal voltage is shown as follows:
Figure FDA0003298161830000053
CN202111183338.1A 2021-10-11 2021-10-11 Double-input high-reliability Cuk DC-DC converter Pending CN113965083A (en)

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