CN113890348A - Single-input high-reliability Zeta DC-DC converter - Google Patents

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

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CN113890348A
CN113890348A CN202111129491.6A CN202111129491A CN113890348A CN 113890348 A CN113890348 A CN 113890348A CN 202111129491 A CN202111129491 A CN 202111129491A CN 113890348 A CN113890348 A CN 113890348A
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capacitor
inductor
terminal
diode
power switch
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邾玢鑫
郭浩
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 single-input high-reliability Zeta DC-DC converter comprises a direct current input source, a basic Zeta 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 two inductors, two capacitors and a diode, and the adjustment of the input and output gains of the converter 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 of the expansion unit is damaged, the other circuits can work normally. Is suitable for the conditions that the output and input voltage and the output voltage have larger variation range and need two power suppliesPower supply time and high reliability.

Description

Single-input high-reliability Zeta DC-DC converter
Technical Field
The invention relates to a DC-DC converter, in particular to a single-input high-reliability Zeta 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, the scheme of the input and output gain of the single-input DC-DC converter mostly adopts a basic circuit and a cascade structure, but the reliability is poor. Therefore, the research on the single-input buck-boost DC/DC converter which can realize high-gain boost and has high reliability has important significance.
Disclosure of Invention
The problem that the existing non-isolated single-input high-gain DC-DC converter is low in reliability is solved. The invention provides a single-input high-reliability Zeta DC-DC converter based on a basic Zeta converter, which consists of the basic Zeta converter, an input unit and a plurality of gain expansion units. The input and output gains of the converter 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 of the expansion unit is damaged, the 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 single input high reliability Zeta DC-DC converter comprising: the Zeta converter comprises a basic Zeta converter, m positive expansion units and n negative expansion units;
the basic Zeta converter comprises an inductance L0、L0', capacitance C0、C0', power switch S0Diode D0(ii) a Power switch S0Drain electrode connected with DC input source VgPositive pole, power switch S0The source electrodes are respectively connected with an inductor L0One terminal, capacitor C0One terminal, capacitor C0The other ends are respectively connected with an inductor L0' one terminal, diode D0Cathode, inductor L0' the other end is connected with a capacitor C0' one end; capacitor C0' the other end, diode D0Anode, inductor L0The other ends are connected with a direct current input source VgA negative electrode;
m forward expansion units:
the 1 st forward extension unit comprises an inductor L1、L2Diode D1Power switch S1Capacitor C1、C2(ii) a Wherein the power switch S1The source electrodes are respectively connected with an inductor L1One terminal, capacitor C1One terminal, inductor L1The other end is connected with a grounding end; capacitor C1The other ends are respectively connected with a diode D1Cathode, inductor L2One terminal, inductor L2The other end is connected with a capacitor C2One end;
the 2 nd forward extension unit comprises an inductor L3、L4Diode D2Power switch S2Capacitor C3、C4(ii) a Wherein the power switch S2The source electrodes are respectively connected with an inductor L3One terminal, capacitor C3One terminal, inductor L3The other end is connected with a grounding end; capacitor C3The other ends are respectively connected with a diode D2Cathode, inductor L4One terminal, inductor L4The other end is connected with a capacitor C4One end;
… …, and so on, the mth forward expansion unit,
the mth forward expansion unit comprises an inductor L(2m-1)、L2mDiode DmPower switch SmCapacitor C(2m-1)、C2m(ii) a Wherein the power switch SmThe source electrodes are respectively connected with an inductor L(2m-1)One terminal, capacitor C(2m-1)One terminal, inductor L(2m-1)The other end is connected with a grounding end; capacitor C(2m-1)The other ends are respectively connected with a diode DmCathode, inductor L2mOne terminal, inductor L2mThe other end is connected with a capacitor C2mOne end;
power switch S1、S2……SmAll the drains of the two-way transistor are connected with a direct current input source VgA positive electrode;
capacitance C in basic Zeta converter0' one end is connected with a diode D in the 1 st forward extension unit1An anode, a cathode, a anode and a cathode,
capacitance C in the 1 st forward extension unit2One end of the diode D is connected with the diode D in the 2 nd forward extension unit2An anode;
capacitor C in 2 nd forward extension unit4One end of the diode D is connected with the diode D in the 3 rd forward extension unit3An anode;
… … and so on, the capacitance C in the m-1 st forward extension cell2m-2One end of the diode D is connected with the diode D in the mth forward extension unitmAn anode;
capacitor C2Another terminal, a capacitor C4Another terminal, … … capacitor C2m-2Another terminal, a capacitor C2mThe other ends are connected with a capacitor C0' the other end.
n negative-going expansion units:
the 1 st negative direction extension unit comprises an inductor L1'、L2', capacitance C1'、C2', power switch S1', diode D1'; wherein the power switch S1The source electrodes are respectively connected with an inductor L1' one terminal, capacitor C1' one terminal, inductor L1The other end is connected with a grounding terminal; capacitor C1' the other end is respectively connected with a diode D1' cathode, inductor L2' one terminal, inductor L2' the other end is connected with a capacitor C2' one end;
the 2 nd negative direction extension unit comprises an inductor L3'、L4', capacitance C3'、C4', power switch S2', diode D2'; wherein the power switch S2The source electrodes are respectively connected with an inductor L3' one terminal, capacitor C3' one terminal, inductor L3The other end is connected with a grounding terminal; capacitor C3' the other end is respectively connected with a diode D2' cathode, inductor L4' one terminal, inductor L4' the other end is connected with a capacitor C4' one end;
… …, and so on, the nth negative going expansion cell,
the nth negative extension unit comprises an inductor L(2n-1)'、L2n', capacitance C(2n-1)'、C2n', power switch Sn', diode Dn'; wherein the power switch SnThe source electrodes are respectively connected with an inductor L(2n-1)' one terminal, capacitor C(2n-1)' one terminal, inductor L(2n-1)The other end is connected with a grounding terminal; capacitor C(2n-1)' the other end is respectively connected with a diode Dn' cathode, inductor L2n' one terminal, inductor L2n' the other end is connected with a capacitor C2n' one end;
power switch S1'、S2'……SnThe drains of the' are all connected with a direct current input source VgA positive electrode;
diode D in the 1 st negative extension cell1' Anode connects the capacitance C in the 2 nd negative extension unit4' at one end thereof,
diode D in the 2 nd negative extension cell1' Anode connects the capacitance C in the 3 rd negative extension unit6' at one end thereof,
… … and so on, the diode D in the n-1 th negative extension celln' Anode connects the capacitance C in the nth negative extension unit2n' at one end thereof,
capacitance C in basic Zeta converter0' the other end is connected with a capacitor C2' at one end thereof,
capacitance C in the 1 st negative extension cell2' the other end is connected with the capacitor C in the 2 nd negative direction extension unit4' at one end thereof,
capacitance C in the 2 nd negative extension cell4' the other end is connected with the capacitor C in the 3 rd negative direction extension unit6' at one end thereof,
… … and so on,
capacitance C in the (n-1) th negative extension unit2n-2' the other end is connected with the capacitor C in the nth negative extension unit2n' one end;
one end of a load R is connected with a capacitor C in the mth forward expansion unit2mOne end of the load R and the other end of the load R are connected with the nth negative extensionCapacitance C in the cell2n' the other end.
The power switch S0Grid, power switch S1、S2……SmGrid, power switch S1'、S2'……SnThe gates are connected to their controller, the duty cycle of which can vary from 0 to 1; power switch S1、S2……SmPower switch S1'、S2'……SnWhen any power switch in the power switch is damaged, the whole circuit can continue to work normally.
When the number of expansion units is 1, and n is 1, the single-input high-reliability Zeta DC-DC converter comprises a basic Zeta converter, 1 positive expansion unit and 1 negative expansion unit;
the basic Zeta converter comprises an inductance L0、L0', capacitance C0、C0', power switch S0Diode D0(ii) a Power switch S0Drain electrode connected with DC input source VgPositive pole, power switch S0The source electrodes are respectively connected with an inductor L0One terminal, capacitor C0One terminal, capacitor C0The other ends are respectively connected with an inductor L0' one terminal, diode D0Cathode, inductor L0' the other end is connected with a capacitor C0' one end; capacitor C0' the other end, diode D0Anode, inductor L0The other ends are connected with a direct current input source VgA negative electrode;
the 1 st forward extension unit comprises an inductor L1、L2Diode D1Power switch S1Capacitor C1、C2(ii) a Wherein the power switch S1The source electrodes are respectively connected with an inductor L1One terminal, capacitor C1One terminal, inductor L1The other end is connected with a grounding end; capacitor C1The other ends are respectively connected with a diode D1Cathode, inductor L2One terminal, inductor L2The other end is connected with a capacitor C2One end;
power switch S1Drain electrode connected with DC input source VgA positive electrode; basic Zeta variationCapacitor C in converter0' one end is connected with a diode D in the 1 st forward extension unit1An anode; capacitor C2The other end is connected with a capacitor C in the basic Zeta converter0' the other end.
The 1 st negative direction extension unit comprises an inductor L1'、L2', capacitance C1'、C2', power switch S1', diode D1'; wherein the power switch S1The source electrodes are respectively connected with an inductor L1' one terminal, capacitor C1' one terminal, inductor L1The other end is connected with a grounding terminal; capacitor C1' the other end is respectively connected with a diode D1' cathode, inductor L2' one terminal, inductor L2' the other end is connected with a capacitor C2' one end; capacitance C in basic Zeta converter0' the other end is connected with a capacitor C2' one end; capacitor C2' the other end is connected with a diode D1' an anode;
one end of a load R is connected with a capacitor C2One end of the load R and the other end of the load R are connected with a capacitor C2' the other end.
The invention discloses a single-input high-reliability Zeta 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 the input is VgThe input and output gains are:
Figure BDA0003279950260000041
the voltage stress of the switching tube is as follows:
Figure BDA0003279950260000042
the stress on each diode is:
Figure BDA0003279950260000051
wherein: d is the duty cycle, VgIs an input voltage uoTo output a voltage us0、us1、us1' is the voltage stress of the power switch, and m and n are the number of the external expansion units.
2) Power switch S1、S2……SmPower switch S1'、S2'……SnWhen any power switch is damaged, the whole circuit
The circuit can continue to operate normally.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Fig. 2 is a schematic diagram of a conventional Zeta 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/output gain of the present invention with the forward extension unit number of 1 and the reverse extension unit number of 1 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 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 single-input high-reliability Zeta DC-DC converter comprises a direct current input source, a basic Zeta converter, an input unit, m positive extension units and n negative voltage extension units, wherein the input unit is used for inputting a direct current input source; wherein:
the input unit of the basic Zeta converter comprises two inductors L0、L0', two capacitors C0、C0', a power switch S0A diode D0(ii) a The connection form is as follows: work (Gong)Rate switch S0Is connected with a DC input source VgPositive pole of (2), power switch S0Are respectively connected with an inductor L0One terminal of and a capacitor C0One terminal of (C), a capacitor0The other end of the first and second inductors are respectively connected with the inductor L0' one terminal and diode D0Is connected to the cathode of the inductor L0The other terminal of the' and a capacitor C0One terminal of' is connected to a capacitor C0The other end of the' and a diode D0Is connected with the anode of the inductor L0And the other end of the DC input source VgThe negative electrodes are connected;
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: inductor L1、L2Diode D1Two capacitors C1、C2(ii) a Wherein, the capacitor C1And one end of (A) and L1One end of the two ends are connected; capacitor C1The 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 L1The other end of the power supply is connected with the negative electrode of the power supply; capacitor C2The other end of the power supply is connected with the negative electrode of the power supply;
the connection relationship between the 1 st forward extension unit and the basic Zeta converter is as follows:
inductance L in basic Zeta converter0One terminal of and a capacitor C0'the intersection point of one end of the' is connected with the diode D in the 1 st forward extension unit1Is connected to the anode of a capacitor C2One terminal of and a capacitor C0' are connected at the other end.
The connection relationship between the 1 st negative direction extension unit and the input unit is as follows:
inductance L in input unit1One end of the' is connected with the cathode of an input source Vg, and a diode D in the input unit0Anode and capacitor C0'the intersection point of the other end of the' and the inductance L in the 1 st negative direction extension unit2The other terminal of and a capacitor C2' the intersections at one end are connected.
One end of a load R and a capacitor C in the 1 st forward extension unit2One end of (1) and an inductor L2Is connected at the other endPoint connection, the other end of the load R and the capacitor C in the 1 st negative direction extension unit2The other end of the' and a diode D1The anode-connected intersections of' are connected.
The grid of the power switch tube is connected with the controller, and the duty ratio of the power switch tube can be changed between 0 and 1. The on-off time of the power switch tube 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.
When the inductor current is continuously conducted, the circuit can be divided into 2 working states according to different power switch states:
(1): when S is0、S1、S1' conducting, diode D0、D1、D1' all off; inductor L1、L2、L0、L0'、L1'、L2' terminal voltage is shown as follows:
Figure BDA0003279950260000061
(2): when S is0、S1、S1' turn-off, diode D0、D1、D1' all are on; inductor L1、L2、L0、L 0'、L1'、L2' terminal voltage is shown as follows:
Figure BDA0003279950260000071
according to the duty ratio of the controller connected to the grid of the power switch tube, the voltage level on each capacitor can be obtained as follows:
Figure BDA0003279950260000072
fig. 4 is a graph comparing the input/output gain of the conventional Zeta converter with the forward extension unit number of 1 and the backward extension unit number of 1 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 forward extension units is 1, and the number of reverse extension units is 1, and D is 0.6, according to the invention, 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 forward extension units is 1, and the number of reverse extension units is 1, and D is 0.6, according to the invention, and the reliability of the invention is verified by simulation.

Claims (4)

1. A single-input high-reliability Zeta DC-DC converter is characterized by comprising a basic Zeta converter, m positive expansion units and n negative expansion units;
the basic Zeta converter comprises an inductance L0、L0', capacitance C0、C0', power switch S0Diode D0(ii) a Power switch S0Drain electrode connected with DC input source VgPositive pole, power switch S0The source electrodes are respectively connected with an inductor L0One terminal, capacitor C0One terminal, capacitor C0The other ends are respectively connected with an inductor L0' one terminal, diode D0Cathode, inductor L0' the other end is connected with a capacitor C0' one end; capacitor C0' the other end, diode D0Anode, inductor L0The other ends are connected with a direct current input source VgA negative electrode;
m forward expansion units:
the 1 st forward extension unit comprises an inductor L1、L2Diode D1Power switch S1Capacitor C1、C2(ii) a Wherein the power switch S1The source electrodes are respectively connected with an inductor L1One terminal, capacitor C1One terminal, inductor L1The other end is connected with a grounding end; capacitor C1The other ends are respectively connected with a diode D1Cathode, inductor L2One terminal, inductor L2The other end is connected with a capacitorC2One end;
the 2 nd forward extension unit comprises an inductor L3、L4Diode D2Power switch S2Capacitor C3、C4(ii) a Wherein the power switch S2The source electrodes are respectively connected with an inductor L3One terminal, capacitor C3One terminal, inductor L3The other end is connected with a grounding end; capacitor C3The other ends are respectively connected with a diode D2Cathode, inductor L4One terminal, inductor L4The other end is connected with a capacitor C4One end;
… …, and so on, the mth forward expansion unit,
the mth forward expansion unit comprises an inductor L(2m-1)、L2mDiode DmPower switch SmCapacitor C(2m-1)、C2m(ii) a Wherein the power switch SmThe source electrodes are respectively connected with an inductor L(2m-1)One terminal, capacitor C(2m-1)One terminal, inductor L(2m-1)The other end is connected with a grounding end; capacitor C(2m-1)The other ends are respectively connected with a diode DmCathode, inductor L2mOne terminal, inductor L2mThe other end is connected with a capacitor C2mOne end;
power switch S1、S2……SmAll the drains of the two-way transistor are connected with a direct current input source VgA positive electrode;
capacitance C in basic Zeta converter0' one end is connected with a diode D in the 1 st forward extension unit1An anode, a cathode, a anode and a cathode,
capacitance C in the 1 st forward extension unit2One end of the diode D is connected with the diode D in the 2 nd forward extension unit2An anode;
capacitor C in 2 nd forward extension unit4One end of the diode D is connected with the diode D in the 3 rd forward extension unit3An anode;
… … and so on, the capacitance C in the m-1 st forward extension cell2m-2One end of the diode D is connected with the diode D in the mth forward extension unitmAn anode;
capacitor C2Another terminal, a capacitor C4Another terminal, … … capacitor C2m-2Another terminal, a capacitor C2mThe other ends are connected with a capacitor C0' the other end;
n negative-going expansion units:
the 1 st negative direction extension unit comprises an inductor L1'、L2', capacitance C1'、C2', power switch S1', diode D1'; wherein the power switch S1The source electrodes are respectively connected with an inductor L1' one terminal, capacitor C1' one terminal, inductor L1The other end is connected with a grounding terminal; capacitor C1' the other end is respectively connected with a diode D1' cathode, inductor L2' one terminal, inductor L2' the other end is connected with a capacitor C2' one end;
the 2 nd negative direction extension unit comprises an inductor L3'、L4', capacitance C3'、C4', power switch S2', diode D2'; wherein the power switch S2The source electrodes are respectively connected with an inductor L3' one terminal, capacitor C3' one terminal, inductor L3The other end is connected with a grounding terminal; capacitor C3' the other end is respectively connected with a diode D2' cathode, inductor L4' one terminal, inductor L4' the other end is connected with a capacitor C4' one end;
… …, and so on, the nth negative going expansion cell,
the nth negative extension unit comprises an inductor L(2n-1)'、L2n', capacitance C(2n-1)'、C2n', power switch Sn', diode Dn'; wherein the power switch SnThe source electrodes are respectively connected with an inductor L(2n-1)' one terminal, capacitor C(2n-1)' one terminal, inductor L(2n-1)The other end is connected with a grounding terminal; capacitor C(2n-1)' the other end is respectively connected with a diode Dn' cathode, inductor L2n' one terminal, inductor L2n' the other end is connected with a capacitor C2n' one end;
power switch S1'、S2'……SnThe drains of the' are all connected with a direct current input source VgA positive electrode;
diode D in the 1 st negative extension cell1' Anode connects the capacitance C in the 2 nd negative extension unit4' at one end thereof,
diode D in the 2 nd negative extension cell1' Anode connects the capacitance C in the 3 rd negative extension unit6' at one end thereof,
… … and so on, the diode D in the n-1 th negative extension celln' Anode connects the capacitance C in the nth negative extension unit2n' at one end thereof,
capacitance C in basic Zeta converter0' the other end is connected with a capacitor C2' at one end thereof,
capacitance C in the 1 st negative extension cell2' the other end is connected with the capacitor C in the 2 nd negative direction extension unit4' at one end thereof,
capacitance C in the 2 nd negative extension cell4' the other end is connected with the capacitor C in the 3 rd negative direction extension unit6' at one end thereof,
… … and so on,
capacitance C in the (n-1) th negative extension unit2n-2' the other end is connected with the capacitor C in the nth negative extension unit2n' one end;
one end of a load R is connected with a capacitor C in the mth forward expansion unit2mOne end of the load R and the other end of the load R are connected with the capacitor C in the nth negative direction extension unit2n' the other end.
2. A single-input high-reliability Zeta DC-DC converter according to claim 1, characterized in that: the power switch S0Grid, power switch S1、S2……SmGrid, power switch S1'、S2'……SnThe gates are connected to their controller, the duty cycle of which can vary from 0 to 1; power switch S1、S2……SmPower switch S1'、S2'……SnWhen any power switch in the power switch is damaged, the whole circuit can continue to work normally.
3. A single-input high-reliability Zeta DC-DC converter is characterized by comprising a basic Zeta converter, 1 positive expansion unit and 1 negative expansion unit;
the basic Zeta converter comprises an inductance L0、L0', capacitance C0、C0', power switch S0Diode D0(ii) a Power switch S0Drain electrode connected with DC input source VgPositive pole, power switch S0The source electrodes are respectively connected with an inductor L0One terminal, capacitor C0One terminal, capacitor C0The other ends are respectively connected with an inductor L0' one terminal, diode D0Cathode, inductor L0' the other end is connected with a capacitor C0' one end; capacitor C0' the other end, diode D0Anode, inductor L0The other ends are connected with a direct current input source VgA negative electrode;
the 1 st forward extension unit comprises an inductor L1、L2Diode D1Power switch S1Capacitor C1、C2(ii) a Wherein the power switch S1The source electrodes are respectively connected with an inductor L1One terminal, capacitor C1One terminal, inductor L1The other end is connected with a grounding end; capacitor C1The other ends are respectively connected with a diode D1Cathode, inductor L2One terminal, inductor L2The other end is connected with a capacitor C2One end;
power switch S1Drain electrode connected with DC input source VgA positive electrode; capacitance C in basic Zeta converter0' one end is connected with a diode D in the 1 st forward extension unit1An anode; capacitor C2The other end is connected with a capacitor C in the basic Zeta converter0' the other end;
the 1 st negative direction extension unit comprises an inductor L1'、L2', capacitance C1'、C2', power switch S1', diode D1'; wherein the power switch S1The source electrodes are respectively connected with an inductor L1' one terminal, capacitor C1' one terminal, inductor L1The other end is connected with a grounding terminal; capacitor with a capacitor elementC1' the other end is respectively connected with a diode D1' cathode, inductor L2' one terminal, inductor L2' the other end is connected with a capacitor C2' one end;
capacitance C in basic Zeta converter0' the other end is connected with a capacitor C2' one end; capacitor C2' the other end is connected with a diode D1' an anode;
one end of a load R is connected with a capacitor C2One end of the load R and the other end of the load R are connected with a capacitor C2' the other end.
4. A single-input high-reliability Zeta DC-DC converter according to claim 3, characterized in that: provided with an inductor LnAt a voltage of VLnCapacitor CnAt a voltage of VnAnd m and n are serial numbers of inductors or capacitors:
mode 1: when S is0、S1、S1' conducting, diode D0、D1、D1' all off; inductor L1、L2、L0、L0'、L1'、L2' terminal voltage is shown as follows:
Figure FDA0003279950250000041
mode 2: when S is0、S1、S1' turn-off, diode D0、D1、D1' all are on; inductor L1、L2、L0、L0'、L1'、L2' terminal voltage is shown as follows:
Figure FDA0003279950250000042
the voltage of the two ends of the inductor is zero in one period; the mathematical relation of the voltage at two ends of each capacitor and the duty ratio is obtained as follows:
Figure FDA0003279950250000051
CN202111129491.6A 2021-09-26 2021-09-26 Single-input high-reliability Zeta DC-DC converter Pending CN113890348A (en)

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