CN113890351A - Multi-input high-reliability Zeta DC-DC converter - Google Patents

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

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Publication number
CN113890351A
CN113890351A CN202111131218.7A CN202111131218A CN113890351A CN 113890351 A CN113890351 A CN 113890351A CN 202111131218 A CN202111131218 A CN 202111131218A CN 113890351 A CN113890351 A CN 113890351A
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China
Prior art keywords
capacitor
inductor
power switch
diode
extension unit
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邾玢鑫
杜伟兮
刘佳欣
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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 multiple-input high-reliability Zeta DC-DC converter comprisesm+n+1A direct current input source, a basic Zeta converter,ma forward voltage extension unit for extending a forward voltage of the power supply,nand a negative voltage extension unit. All the extension units are composed of a direct current source, two inductors, two capacitors and a diode, and 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 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. Is more suitable for the ratio of the variation range of the output-input voltage and the output voltageThe power supply is large, a plurality of power supplies are needed to supply power simultaneously, and the reliability requirement is high.

Description

Multi-input high-reliability Zeta DC-DC converter
Technical Field
The invention relates to a DC-DC converter, in particular to a multi-input high-reliability Zeta 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.
The existing scheme of the input and output gain of the multi-input DC-DC converter basically does not have high gain output and has poor reliability. Therefore, it is important to research a multi-input buck-boost DC/DC converter which can realize high-gain boost and has high reliability.
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 Zeta DC-DC converter based on a basic Zeta circuit, which consists of a basic Zeta converter, an input unit 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 with large variation range of output and input voltage and output voltage, power supply requirements of a plurality of power supplies and high reliability requirements.
The technical scheme adopted by the invention is as follows:
a multiple-input high reliability Zeta DC-DC converter, the converter comprising: m + n +1 direct current input sources, a basic Zeta converter, m positive voltage expansion units and n negative voltage expansion units;
the basic Zeta converter comprises an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1；
Power switch S1Drain connected to DC input source uinPositive pole, power switch S1The source electrodes are respectively connected with an inductor L1One terminal, capacitor C1One terminal, capacitor C1The other ends are respectively connected with a diode D1Cathode, inductor L2One terminal, inductor L2The other end is connected with a capacitor C2One terminal, capacitor C2Another terminal, diode D1Anode, inductor L1The other ends are connected with a direct current input source uinA negative electrode; m forward voltage extension units:
the 1 st forward voltage extension unit comprises an inductor LM11、LM12Power switch SM1Diode DM1Capacitor CM11、CM12(ii) a Wherein: power switch SM1Drain connected to DC input source uM1Positive pole, power switch SM1The source electrodes are respectively connected with an inductor LM12One terminal, capacitor CM11One end; inductor LM12The other end is connected with a direct current input source uM1A negative electrode; capacitor CM11The other ends are respectively connected with a diode DM1Cathode, inductor LM11One end; inductor LM11The other end is connected with a capacitor CM12One end;
the 2 nd forward voltage extension unit comprises an inductor LM21、LM22Power switch SM2Diode DM2Capacitor CM21、CM22(ii) a Wherein: power switch SM2Drain connected to DC input source uM2Positive pole, power switch SM2The source electrodes are respectively connected with an inductor LM22One terminal, capacitor CM21One end; inductor LM22The other end is connected with a direct current input source uM2A negative electrode; capacitor CM21The other ends are respectively connected with a diode DM2Cathode, inductor LM21One end; inductor LM21The other end is connected with a capacitor CM22One end;
.... analogizing in sequence, wherein 1< i is less than or equal to m in the ith forward voltage expansion unit;
the ith forward voltage extension unit comprises an inductor LMi1、LMi2Power switch SMiDiode DMiCapacitor CMi1、CMi2(ii) a Wherein: power switch SMiDrain connected to DC input source uMiPositive pole, power switch SMiSource electrodeRespectively connected with inductors LMi2One terminal, capacitor CMi1One end; inductor LMi2The other end is connected with a direct current input source uMiA negative electrode; capacitor CMi1The other ends are respectively connected with a diode DMiCathode, inductor LMi1One end; inductor LMi1The other end is connected with a capacitor CMi2One end;
DC input source uM1、uM2......uMiThe cathodes of the two are connected with a direct current input source u in a basic Zeta converterinA negative electrode;
diode D in the 1 st forward voltage extension unitM1Capacitor C in anode-connected basic Zeta converter2One end; diode D in 2 nd forward voltage extension unitM2Anode connected to capacitor C in the 1 st forward voltage extension unitM12One terminal, capacitor C in the 1 st forward voltage extension unitM12The other end is connected with a capacitor C in the 2 nd forward voltage extension unitM22The other end;
diode D in the 3 rd forward voltage extension unitM3Anode connected to capacitor C in 2 nd forward voltage extension unitM22One terminal, capacitor C in the 2 nd forward voltage extension unitM22The other end is connected with a capacitor C in the 3 rd forward voltage extension unitM32The other end;
.... analogy to each other:
diode D in ith forward voltage extension unitMiAnode connected to capacitor C in the i-1 st forward voltage extension unitM(i-1)2One terminal, capacitor C in the i-1 st forward voltage extension unitM(i-1)2The other end is connected with C in the ith forward voltage extension unitMi2And the other end.
n negative-going voltage extension units:
the 1 st negative voltage expansion unit comprises an inductor LN11、LN12Power switch SN1Diode DN1Capacitor CN11、CN12(ii) a Wherein: power switch SN1Drain connected to DC input source uN1Positive pole, power switch SN1Source electrodes are respectively connectedInductor LN11One terminal, capacitor CN11One end; inductor LN11The other end is connected with a direct current input source uN1A negative electrode; capacitor CN11The other ends are respectively connected with a diode DN1Cathode, inductor LN12One end; inductor LN12The other end is connected with a capacitor CN12One end;
the 2 nd negative voltage expansion unit comprises an inductor LN21、LN22Power switch SN2Diode DN2Capacitor CN21、CN22(ii) a Wherein: power switch SN2Drain connected to DC input source uN2Positive pole, power switch SN2The source electrodes are respectively connected with an inductor LN21One terminal, capacitor CN21One end; inductor LN21The other end is connected with a direct current input source uN2A negative electrode; capacitor CN21The other ends are respectively connected with a diode DN2Cathode, inductor LN22One end; inductor LN22The other end is connected with a capacitor CN22One end;
.... analogize in turn, the j-th negative voltage expansion unit is in the range of 1< j ≦ n;
the jth negative voltage extension unit comprises an inductor LNj1、LNj2Power switch SNjDiode DNjCapacitor CNj1、CNj2(ii) a Wherein: power switch SNjDrain connected to DC input source uNjPositive pole, power switch SNjThe source electrodes are respectively connected with an inductor LNj1One terminal, capacitor CNj1One end; inductor LNj1The other end is connected with a direct current input source uNjA negative electrode; capacitor CNj1The other ends are respectively connected with a diode DNjCathode, inductor LNj2One end; inductor LNj2The other end is connected with a capacitor CNj2One end;
DC input source uN1、uN2......uNjThe cathodes of the two are connected with a direct current input source u in a basic Zeta converterinA negative electrode;
capacitor C in 1 st negative voltage extension unitN12One end of the capacitor C is connected with the basic Zeta converter2The other end of the first tube is provided with a first end,
diode D in the 1 st negative voltage extension unitN1Anode connected to capacitor C in 2 nd negative voltage extension unitN22One terminal, the capacitor C in the 1 st negative voltage extension unitN12The other end is connected with a capacitor C in the 2 nd negative voltage expansion unitN22The other end;
diode D in the 2 nd negative voltage extension unitN2The anode is connected with a capacitor C in the 3 rd negative voltage extension unitN32One terminal, the capacitor C in the 2 nd negative voltage extension unitN22The other end is connected with a capacitor C in the 3 rd negative voltage expansion unitN32The other end;
.... analogize in turn, the j-th negative voltage expansion unit is in the range of 1< j ≦ n;
diode D in j-1 th negative voltage extension unitN(j-1)The anode is connected with a capacitor C in the jth negative voltage extension unitNj2Capacitor C in the j-1 th negative voltage extension unit at one endN(j-1)2The other end is connected with a capacitor C in the jth negative voltage extension unitNj2And the other end.
One end of a load R is connected with a capacitor C in the mth forward extension unitMm2One end of the load R and the other end of the load R are connected with a capacitor C in the jth negative voltage extension unitNj2And the other end.
The power switch S1Power switch SM1、SM2......SMiPower switch SN1、SN2......SNjThe duty ratio of the grid electrodes of the power switch S can be changed between 0 and 1 when the power switch S in the circuit is connected with a controllerM1、SM2......SMiPower switch SN1、SN2......SNjWhen any one of the switch tubes is damaged, the whole circuit can still continue to work normally through closed-loop control.
When the number of forward extension units is 1 and the number of reverse extension units is 2, the multi-input high-reliability Zeta DC-DC converter comprises: 3 direct current input sources, a basic Zeta converter, 1 positive voltage expansion unit and 2 negative voltage expansion units;
the basic Zeta converter comprises an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1；
Power switch S1Drain connected to DC input source uinPositive pole, power switch S1The source electrodes are respectively connected with an inductor L1One terminal, capacitor C1One terminal, capacitor C1The other ends are respectively connected with a diode D1Cathode, inductor L2One terminal, inductor L2The other end is connected with a capacitor C2One terminal, capacitor C2Another terminal, diode D1Anode, inductor L1The other ends are connected with a direct current input source uinA negative electrode;
1 forward voltage extension unit:
the 1 st forward voltage extension unit comprises an inductor LM11、LM12Power switch SM1Diode DM1Capacitor CM11、CM12(ii) a Wherein: power switch SM1Drain connected to DC input source uM1Positive pole, power switch SM1The source electrodes are respectively connected with an inductor LM12One terminal, capacitor CM11One end; inductor LM12The other end is connected with a direct current input source uM1A negative electrode; capacitor CM11The other ends are respectively connected with a diode DM1Cathode, inductor LM11One end; inductor LM11The other end is connected with a capacitor CM12One end;
DC input source uM1Negative pole connected DC input source u in basic Zeta converterinA negative electrode;
diode D in the 1 st forward voltage extension unitM1Capacitor C in anode-connected basic Zeta converter2One end; capacitor C in the 1 st forward voltage extension unitM12The other end is connected with a capacitor C2And the other end.
2 negative voltage extension units:
the 1 st negative voltage expansion unit comprises an inductor LN11、LN12Power switch SN1Diode DN1Capacitor CN11、CN12(ii) a Wherein: power switch SN1Drain connected to DC input source uN1Positive pole, power switch SN1The source electrodes are respectively connected with an inductor LN11One terminal, capacitor CN11One end; inductor LN11The other end is connected with a direct current input source uN1A negative electrode; capacitor CN11The other ends are respectively connected with a diode DN1Cathode, inductor LN12One end; inductor LN12The other end is connected with a capacitor CN12One end;
the 2 nd negative voltage expansion unit comprises an inductor LN21、LN22Power switch SN2Diode DN2Capacitor CN21、CN22(ii) a Wherein: power switch SN2Drain connected to DC input source uN2Positive pole, power switch SN2The source electrodes are respectively connected with an inductor LN21One terminal, capacitor CN21One end; inductor LN21The other end is connected with a direct current input source uN2A negative electrode; capacitor CN21The other ends are respectively connected with a diode DN2Cathode, inductor LN22One end; inductor LN22The other end is connected with a capacitor CN22One end;
DC input source uN1、uN2The cathodes of the two are connected with a direct current input source u in a basic Zeta converterinA negative electrode;
capacitor C in 1 st negative voltage extension unitN12One end of the capacitor C is connected with the basic Zeta converter2The other end of the first tube is provided with a first end,
diode D in the 1 st negative voltage extension unitN1Anode connected to capacitor C in 2 nd negative voltage extension unitN22One terminal, the capacitor C in the 1 st negative voltage extension unitN12The other end is connected with a capacitor C in the 2 nd negative voltage expansion unitN22The other end;
diode D in the 2 nd negative voltage extension unitN2The anode is connected with a capacitor C in the 3 rd negative voltage extension unitN32One terminal, the capacitor C in the 2 nd negative voltage extension unitN22The other end is connected with the 3 rdCapacitance C in negative voltage extension unitN32The other end;
one end of a load R is connected with a capacitor C in the 1 st forward extension unitM12One end of the load R and the other end of the load R are connected with a capacitor C in the 2 nd negative voltage expansion unitN22And the other end.
The invention discloses a multi-input high-reliability Zeta 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 L1And LMi1When the current of (2) is continuously conducted, the following is concrete:
when u isM1＝…＝uMm＝uin＝uN1＝…＝uNnThe maximum input-output gain is:
Figure BDA0003280543930000061
the voltage stress of the switching tube is as follows:
Figure BDA0003280543930000062
the voltage on each output capacitor is:
Figure BDA0003280543930000063
wherein: d is the duty cycle, uSiFor the ith forward extension unit switching tube voltage,
Figure BDA0003280543930000064
for the jth negative-going extension cell switching tube voltage,
Figure BDA0003280543930000065
the capacitor voltage of the output end of the ith forward expansion unit cell,
Figure BDA0003280543930000066
is the output end capacitance voltage u of the jth negative direction extension unitMiIs the direct current input source voltage of the ith forward extension unit,
Figure BDA0003280543930000067
the voltage is a direct current input source voltage of the jth negative-direction expansion unit, m is the total number of the positive-direction expansion units, i is more than or equal to 1 and less than or equal to m, n is the total number of the negative-direction expansion units, and j is more than or equal to 1 and less than or equal to n;
2) when the power switch S in the circuitM1、SM2......SMiPower switch SN1、SN2......SNjWhen any one of the switch tubes is damaged, the whole circuit can still continue to work normally through closed-loop control.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Fig. 2 is a circuit topology diagram when the number of forward extension units is 1 and the number of reverse extension units is 2 according to the present invention.
Fig. 3 is a schematic diagram of a conventional Zeta converter circuit.
Fig. 4 is a graph comparing the input/output gain of the present invention with 1 forward extension unit number and 2 backward extension unit number with the input/output gain of the conventional Zeta converter.
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 2 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 2 according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 2 shows a circuit topology diagram when the number of forward extension units is 1 and the number of reverse extension units is 2 in the present invention: a multi-input high-reliability Zeta DC-DC converter comprises 4 direct current input sources, a basic Zeta converter, 1 positive voltage expansion unit and 2 negative voltage expansion units; wherein:
the basic Zeta converter comprises two inductors L1、L2Two capacitors C1、C2A power switch S1A diode D1(ii) a The connection form is as follows: power switch S1Is connected with a DC input source uinThe source of the positive electrode of (2) is connected with an inductor L1One terminal of and a 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 cathode of the inductor L2Another terminal of (1) and a capacitor C2Is connected to one end of an inductor L1Another terminal of (1), diode D1Anode and capacitor C2Another end of (1) and a DC input source uinThe negative electrodes are connected;
the 1 st forward voltage extension unit comprises two inductors LM11、LM12A power switch SM1A diode DM1Two capacitors CM11、CM12(ii) a Wherein the power switch SM1Is connected with a DC input source uM1The source of the positive electrode of (2) is connected with an inductor LM11One terminal of (1), inductance LM11Another end of (1) and a DC input source uM1Is connected to the negative electrode of a capacitor CM11Are respectively connected with the inductor LM11And a diode DM1Is connected to the cathode of the inductor LM12Another terminal of (1) and a capacitor CM12One end of the two ends are connected;
the 1 st negative voltage expansion unit comprises two inductors LN11、LN12A power switch SN1A diode DN1Two capacitors CN11、CN12(ii) a Wherein the power switch SN1Is connected with a DC input source uN1The source of the positive electrode of (2) is connected with an inductor LN11One terminal of (1), inductance LN11Another end of (1) and a DC input source uN1Is connected to the negative electrode of a capacitor CN11Are respectively connected with the inductor LN11And a diode DN1Is connected to the cathode of the inductor LN12Another terminal of (1) and a capacitor CN12One end of the two ends are connected;
the 2 nd negative voltage expansion unit comprises two inductors LN21、LN22A power switch SN2One is twoPolar tube DN2Two capacitors CN21、CN22(ii) a Wherein the power switch SN2Is connected with a DC input source uN2The source of the positive electrode of (2) is connected with an inductor LN21One terminal of (1), inductance LN21Another end of (1) and a DC input source uN2Is connected to the negative electrode of a capacitor CN21Are respectively connected with the inductor LN21And a diode DN2Is connected to the cathode of the inductor LN22Another terminal of (1) and a capacitor CN22Is connected to one terminal of a diode DN2Anode and capacitor CN22The other ends of the two are connected;
the connection form between two negative direction extension units is as follows:
diode D in the 2 nd negative extension cellN2Anode and inductance L in the 1 st forward extension unitN12And a capacitor CN12Are connected at an intersection point, a capacitor CN22And the other end of the positive extension unit is connected with a capacitor C in the 1 st positive extension unitN12The other ends of the capacitors at the output ends of the two negative direction extension units are collinear;
the connection relationship between the 1 st forward extension unit and the basic Zeta converter is as follows:
inductance L in basic Zeta converter2Another terminal of (1) and a capacitor C2One end of the diode is connected with a diode D in the 1 st forward extension unitM1Is connected with a direct current input source uinNegative pole and capacitor C in the 1 st forward extension unitM12The other ends of the two are connected;
the connection relationship between the 1 st negative-direction extension unit and the basic Zeta converter is as follows:
diode D in a basic Zeta converter1Anode and inductance L in the 1 st negative-going extension unitN12Another terminal of (1) and a capacitor CN22One end of the two connecting rods is connected with the intersection point;
one end of a load R and a capacitor C in the 1 st forward extension unitM12One end of (1) and an inductor LM12Is connected with the other end of the load R, and the other end of the load R is connected with the capacitor C in the 2 nd negative direction extension unitN22Another terminal of (1) and a diodeDN2The anodes of (1) are connected at the intersection point.
The gates of all power switches are connected to a controller, the duty cycle of which can be varied between 0 and 1. The on-off time of each power switch can be controlled by adjusting the duty ratio, and the output voltage grade can be adjusted according to the voltage balance formula of the inductor.
At the inductor L1、LM11、LN11、LN21When the current is continuously conducted, the circuit can be divided into 2 working states according to different power switch states:
(1): power switch S1、SM1、SN1And SN2Conducting, diode D1、DM1、DN1、DN2Are all turned off, at the moment, the inductance L1、L2、LM11、LM12、LN11、LN12、LN21、LN22And a capacitor C2、CM12、CN12、CN22Charging, capacitance C1、CM11、CN11、CN21Discharging; inductor L1、L2、LM11、LM12、LN11、LN12、LN21、LN22The terminal voltage is shown as follows:
Figure BDA0003280543930000081
(2): power switch S1、SM1、SN1And SN2Turn-off, diode D1、DM1、DN1、DN2Are all conducted, at this moment, the inductance L1、L2、LN11、LN12、LN21、LN22And a capacitor C2、CN12、CN22Discharge, capacitance C1、CN11、CN21Charging; inductor L1、L2、LN11、LN12、LN21、LN22The terminal voltage is shown as follows:
Figure BDA0003280543930000091
according to the connection at the power switch S1、SM1、SN1And SN2The duty cycle of the controller on the gate, one can derive the voltage level on each capacitor as follows:
Figure BDA0003280543930000092
fig. 4 is a graph comparing the input/output gain of the conventional Zeta converter with the positive expansion unit number of 1 and the negative expansion unit number of 2 according to the present invention. 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, the number of positive-direction extension units is 1, and the number of negative-direction extension units is 2, and D is 0.6, and the feasibility of the invention is verified through simulation.
Fig. 6 is a simulation diagram of an output waveform when the switching tube S1 is damaged when the input voltage is 30V, the number of positive expansion cells is 1, the number of negative expansion cells is 2, and D is 0.6, and the reliability of the present invention is verified by simulation.

Claims (4)

1. A multiple-input high-reliability Zeta DC-DC converter, characterized in that the converter comprises: m + n +1 direct current input sources, a basic Zeta converter, m positive voltage expansion units and n negative voltage expansion units;
the basic Zeta converter comprises an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1；
Power switch S1Drain connected to DC input source uinPositive pole, power switch S1The source electrodes are respectively connected with an inductor L1One terminal, capacitor C1One terminal, capacitor C1The other ends are respectively connected with a diode D1Cathode and inductorL2One terminal, inductor L2The other end is connected with a capacitor C2One terminal, capacitor C2Another terminal, diode D1Anode, inductor L1The other ends are connected with a direct current input source uinA negative electrode;
m forward voltage extension units:
the 1 st forward voltage extension unit comprises an inductor LM11、LM12Power switch SM1Diode DM1Capacitor CM11、CM12(ii) a Wherein: power switch SM1Drain connected to DC input source uM1Positive pole, power switch SM1The source electrodes are respectively connected with an inductor LM12One terminal, capacitor CM11One end; inductor LM12The other end is connected with a direct current input source uM1A negative electrode; capacitor CM11The other ends are respectively connected with a diode DM1Cathode, inductor LM11One end; inductor LM11The other end is connected with a capacitor CM12One end;
the 2 nd forward voltage extension unit comprises an inductor LM21、LM22Power switch SM2Diode DM2Capacitor CM21、CM22(ii) a Wherein: power switch SM2Drain connected to DC input source uM2Positive pole, power switch SM2The source electrodes are respectively connected with an inductor LM22One terminal, capacitor CM21One end; inductor LM22The other end is connected with a direct current input source uM2A negative electrode; capacitor CM21The other ends are respectively connected with a diode DM2Cathode, inductor LM21One end; inductor LM21The other end is connected with a capacitor CM22One end;
.... analogizing in sequence, wherein 1< i is less than or equal to m in the ith forward voltage expansion unit;
the ith forward voltage extension unit comprises an inductor LMi1、LMi2Power switch SMiDiode DMiCapacitor CMi1、CMi2(ii) a Wherein: power switch SMiDrain connected to DC input source uMiPositive pole, power switch SMiThe source electrodes are respectively connected with an inductor LMi2One terminal, electricityContainer CMi1One end; inductor LMi2The other end is connected with a direct current input source uMiA negative electrode; capacitor CMi1The other ends are respectively connected with a diode DMiCathode, inductor LMi1One end; inductor LMi1The other end is connected with a capacitor CMi2One end;
DC input source uM1、uM2......uMiThe cathodes of the two are connected with a direct current input source u in a basic Zeta converterinA negative electrode;
diode D in the 1 st forward voltage extension unitM1Capacitor C in anode-connected basic Zeta converter2One end;
diode D in 2 nd forward voltage extension unitM2Anode connected to capacitor C in the 1 st forward voltage extension unitM12One terminal, capacitor C in the 1 st forward voltage extension unitM12The other end is connected with a capacitor C in the 2 nd forward voltage extension unitM22The other end;
diode D in the 3 rd forward voltage extension unitM3Anode connected to capacitor C in 2 nd forward voltage extension unitM22One terminal, capacitor C in the 2 nd forward voltage extension unitM22The other end is connected with a capacitor C in the 3 rd forward voltage extension unitM32The other end;
.... analogy to each other:
diode D in ith forward voltage extension unitMiAnode connected to capacitor C in the i-1 st forward voltage extension unitM(i-1)2One terminal, capacitor C in the i-1 st forward voltage extension unitM(i-1)2The other end is connected with C in the ith forward voltage extension unitMi2The other end;
n negative-going voltage extension units:
the 1 st negative voltage expansion unit comprises an inductor LN11、LN12Power switch SN1Diode DN1Capacitor CN11、CN12(ii) a Wherein: power switch SN1Drain connected to DC input source uN1Positive pole, power switch SN1The source electrodes are respectively connected with an inductor LN11One terminal, capacitor CN11One end; inductor LN11The other end is connected with a direct current input source uN1A negative electrode; capacitor CN11The other ends are respectively connected with a diode DN1Cathode, inductor LN12One end; inductor LN12The other end is connected with a capacitor CN12One end;
the 2 nd negative voltage expansion unit comprises an inductor LN21、LN22Power switch SN2Diode DN2Capacitor CN21、CN22(ii) a Wherein: power switch SN2Drain connected to DC input source uN2Positive pole, power switch SN2The source electrodes are respectively connected with an inductor LN21One terminal, capacitor CN21One end; inductor LN21The other end is connected with a direct current input source uN2A negative electrode; capacitor CN21The other ends are respectively connected with a diode DN2Cathode, inductor LN22One end; inductor LN22The other end is connected with a capacitor CN22One end;
.... analogize in turn, the j-th negative voltage expansion unit is in the range of 1< j ≦ n;
the jth negative voltage extension unit comprises an inductor LNj1、LNj2Power switch SNjDiode DNjCapacitor CNj1、CNj2(ii) a Wherein: power switch SNjDrain connected to DC input source uNjPositive pole, power switch SNjThe source electrodes are respectively connected with an inductor LNj1One terminal, capacitor CNj1One end; inductor LNj1The other end is connected with a direct current input source uNjA negative electrode; capacitor CNj1The other ends are respectively connected with a diode DNjCathode, inductor LNj2One end; inductor LNj2The other end is connected with a capacitor CNj2One end;
DC input source uN1、uN2......uNjThe cathodes of the two are connected with a direct current input source u in a basic Zeta converterinA negative electrode;
capacitor C in 1 st negative voltage extension unitN12One end of the capacitor C is connected with the basic Zeta converter2The other end of the first tube is provided with a first end,
1 stDiode D in negative voltage extension unitN1Anode connected to capacitor C in 2 nd negative voltage extension unitN22One terminal, the capacitor C in the 1 st negative voltage extension unitN12The other end is connected with a capacitor C in the 2 nd negative voltage expansion unitN22The other end;
diode D in the 2 nd negative voltage extension unitN2The anode is connected with a capacitor C in the 3 rd negative voltage extension unitN32One terminal, the capacitor C in the 2 nd negative voltage extension unitN22The other end is connected with a capacitor C in the 3 rd negative voltage expansion unitN32The other end;
.... analogize in turn, the j-th negative voltage expansion unit is in the range of 1< j ≦ n;
diode D in j-1 th negative voltage extension unitN(j-1)The anode is connected with a capacitor C in the jth negative voltage extension unitNj2Capacitor C in the j-1 th negative voltage extension unit at one endN(j-1)2The other end is connected with a capacitor C in the jth negative voltage extension unitNj2The other end;
one end of a load R is connected with a capacitor C in the mth forward extension unitMm2One end of the load R and the other end of the load R are connected with a capacitor C in the jth negative voltage extension unitNj2And the other end.
2. A multiple-input high-reliability Zeta DC-DC converter according to claim 1, characterized in that: the power switch S1Power switch SM1、SM2......SMiPower switch SN1、SN2......SNjThe duty ratio of the grid electrodes of the power switch S can be changed between 0 and 1 when the power switch S in the circuit is connected with a controllerM1、SM2......SMiPower switch SN1、SN2......SNjWhen any one of the switch tubes is damaged, the whole circuit can still continue to work normally through closed-loop control.
3. A multi-input high-reliability Zeta DC-DC converter is characterized in that: the converterThe method comprises the following steps: 3 direct current input sources, a basic Zeta converter, 1 positive voltage expansion unit and 2 negative voltage expansion units; the basic Zeta converter comprises an inductor L1、L2Capacitor C1、C2Power switch S1Diode D1；
Power switch S1Drain connected to DC input source uinPositive pole, power switch S1The source electrodes are respectively connected with an inductor L1One terminal, capacitor C1One terminal, capacitor C1The other ends are respectively connected with a diode D1Cathode, inductor L2One terminal, inductor L2The other end is connected with a capacitor C2One terminal, capacitor C2Another terminal, diode D1Anode, inductor L1The other ends are connected with a direct current input source uinA negative electrode;
the 1 st forward voltage extension unit comprises an inductor LM11、LM12Power switch SM1Diode DM1Capacitor CM11、CM12(ii) a Wherein: power switch SM1Drain connected to DC input source uM1Positive pole, power switch SM1The source electrodes are respectively connected with an inductor LM12One terminal, capacitor CM11One end; inductor LM12The other end is connected with a direct current input source uM1A negative electrode; capacitor CM11The other ends are respectively connected with a diode DM1Cathode, inductor LM11One end; inductor LM11The other end is connected with a capacitor CM12One end;
DC input source uM1Negative pole connected DC input source u in basic Zeta converterinA negative electrode;
diode D in the 1 st forward voltage extension unitM1Capacitor C in anode-connected basic Zeta converter2One end;
capacitor C in the 1 st forward voltage extension unitM12The other end is connected with a capacitor C2The other end;
the 1 st negative voltage expansion unit comprises an inductor LN11、LN12Power switch SN1Diode DN1Capacitor CN11、CN12(ii) a Wherein: power switch SN1Drain connected to DC input source uN1Positive pole, power switch SN1The source electrodes are respectively connected with an inductor LN11One terminal, capacitor CN11One end; inductor LN11The other end is connected with a direct current input source uN1A negative electrode; capacitor CN11The other ends are respectively connected with a diode DN1Cathode, inductor LN12One end; inductor LN12The other end is connected with a capacitor CN12One end;
the 2 nd negative voltage expansion unit comprises an inductor LN21、LN22Power switch SN2Diode DN2Capacitor CN21、CN22(ii) a Wherein: power switch SN2Drain connected to DC input source uN2Positive pole, power switch SN2The source electrodes are respectively connected with an inductor LN21One terminal, capacitor CN21One end; inductor LN21The other end is connected with a direct current input source uN2A negative electrode; capacitor CN21The other ends are respectively connected with a diode DN2Cathode, inductor LN22One end; inductor LN22The other end is connected with a capacitor CN22One end;
DC input source uN1、uN2The cathodes of the two are connected with a direct current input source u in a basic Zeta converterinA negative electrode;
capacitor C in 1 st negative voltage extension unitN12One end of the capacitor C is connected with the basic Zeta converter2On the other hand, diode D in the 1 st negative voltage extension cellN1Anode connected to capacitor C in 2 nd negative voltage extension unitN22One terminal, the capacitor C in the 1 st negative voltage extension unitN12The other end is connected with a capacitor C in the 2 nd negative voltage expansion unitN22The other end;
diode D in the 2 nd negative voltage extension unitN2The anode is connected with a capacitor C in the 3 rd negative voltage extension unitN32One terminal, the capacitor C in the 2 nd negative voltage extension unitN22The other end is connected with a capacitor C in the 3 rd negative voltage expansion unitN32The other end;
one end of a load R is connected with a capacitor C in the 1 st forward extension unitM12One end of the load R and the other end of the load R are connected with a capacitor C in the 2 nd negative voltage expansion unitN22And the other end.
4. A multiple-input high-reliability Zeta DC-DC converter according to claim 3, characterized in that:
when the number m of positive expansion units is 1 and the number n of negative expansion units is 2, the inductance L is measured1、LM11、LN11、LN21When the current is continuously conducted, the circuit can be divided into 2 working states according to different power switch states:
(1): power switch S1、SM1、SN1And SN2Conducting, diode D1、DM1、DN1、DN2Are all turned off, at the moment, the inductance L1、L2、LM11、LM12、LN11、LN12、LN21、LN22And a capacitor C2、CM12、CN12、CN22Charging, capacitance C1、CM11、CN11、CN21Discharging; inductor L1、L2、LM11、LM12、LN11、LN12、LN21、LN22The terminal voltage is shown as follows:
Figure FDA0003280543920000051
(2): power switch S1、SM1、SN1And SN2Turn-off, diode D1、DM1、DN1、DN2Are all conducted, at this moment, the inductance L1、L2、LN11、LN12、LN21、LN22And a capacitor C2、CN12、CN22Discharge, capacitance C1、CN11、CN21Charging; inductor L1、L2、LN11、LN12、LN21、LN22The terminal voltage is shown as follows:
Figure FDA0003280543920000052
according to the connection at the power switch S1、SM1、SN1And SN2The duty cycle of the controller on the gate, one can derive the voltage level on each capacitor as follows:
Figure FDA0003280543920000061
CN202111131218.7A 2021-09-26 2021-09-26 Multi-input high-reliability Zeta DC-DC converter Pending CN113890351A (en)

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