CN113965080A - Single-input high-reliability Cuk DC-DC converter - Google Patents

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

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Publication number
CN113965080A
CN113965080A CN202111181980.6A CN202111181980A CN113965080A CN 113965080 A CN113965080 A CN 113965080A CN 202111181980 A CN202111181980 A CN 202111181980A CN 113965080 A CN113965080 A CN 113965080A
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capacitor
inductor
terminal
power switch
diode
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Inventor
邾玢鑫
张畅
支树播
刘佳欣
潘海龙
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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 single-input high-reliability Cuk DC-DC converter comprises a direct current input source, a basic Cuk converter and n expansion units. Any expansion unit is composed of two inductors, two capacitors, a diode and a switch tube, and input and output gains of the converter can be realized by adjusting the number of the expansion units. The converter has the characteristics of simple control and drive circuit, wide input and output voltage regulation range and high reliability; when any one of the switching tubes in the expansion unit is damaged, other circuits can work normally; the method is suitable for application occasions with large variation range of output and input voltage and output voltage and high reliability requirement.

Description

Single-input high-reliability Cuk DC-DC converter
Technical Field
The invention relates to a DC-DC converter, in particular to a single-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, the scheme of the input and output gains of the single-input DC-DC converter is mostly constructed by basic circuit cascade, but the reliability is poor. Therefore, the research on the single-input buck-boost DC/DC converter which can realize high-gain boost and has high reliability has important significance.
Disclosure of Invention
The problem that the existing non-isolated single-input high-gain DC-DC converter is low in reliability is solved. The invention provides a single-input high-reliability Cuk DC-DC converter based on a basic Cuk converter, which consists of the basic Cuk converter and a plurality of gain expansion units. The input and output gains of the converter can be realized by adjusting the number of the gain expansion units. The converter has the characteristics of simple control and drive circuit, wide input and output voltage regulation range and high reliability; when one of the switching tubes of the gain expansion unit is damaged, other circuits can work normally; the method is suitable for application occasions with large variation range of output and input voltage and output voltage and high reliability requirement.
The technical scheme adopted by the invention is as follows:
a single input high reliability Cuk DC-DC converter, the converter comprising:
a basic Cuk converter, n expansion units;
the basic Cuk converter comprises an inductance L11、L12Capacitor C11、C12Power switch S1Diode D1(ii) a Wherein: inductor L11Is connected with a DC input source uinPositive electrode of (1), inductor L11Are respectively connected with a power switch S1Drain electrode of (1), capacitor C11One terminal of (C), a capacitor11Are respectively connected with an inductor L at the other end12One end of (A)Diode D1Anode of (2), inductor L12The other end of the capacitor C is connected with a capacitor C12One terminal of (1), power switch S1Source electrode of (2), diode D1And a capacitor C12The other ends of the two are connected with a direct current input source uinThe negative electrode of (1);
among the n extension units:
the 1 st extension unit comprises an inductor L21、L22Capacitor C21、C22Diode D2Power switch S2(ii) a Wherein: feeling L21One end of the first switch is connected with a direct current input source uinPositive electrode of (1), inductor L21Are respectively connected with a power switch S2Drain electrode of (1), capacitor C21One terminal of (C), a capacitor21Are respectively connected with an inductor L at the other end22One terminal of (1), diode D2Anode of (2), inductor L22The other end of the capacitor C is connected with a capacitor C22One terminal of (C), a capacitor22Another terminal of (1), power switch S2The source electrodes of the first and second transistors are all connected with a grounding terminal;
the 2 nd extension unit comprises an inductor L31、L32Capacitor C31、C32Diode D3Power switch S3(ii) a Wherein: inductor L31Is connected with a DC input source uinPositive electrode of (1), inductor L31Are respectively connected with a power switch S3Drain electrode of (1), capacitor C31One terminal of (C), a capacitor31Are respectively connected with an inductor L at the other end32One terminal of (1), diode D3Anode of (2), inductor L32The other end of the capacitor C is connected with a capacitor C32One terminal of (C), a capacitor32Another terminal of (1), power switch S3The source electrodes of the first and second transistors are all connected with a grounding terminal;
.... analogize, of n expansion units:
the nth expansion unit comprises an inductor Ln+1,1、Ln+1,2Capacitor Cn+1,1、Cn+1,2Diode Dn+1Power switch Sn+1(ii) a Wherein: inductor Ln+1,1Is connected with a DC input source uinPositive electrode of (1), inductor Ln+1,1To another one ofThe terminals are respectively connected with a power switch Sn+1Drain electrode of (1), capacitor Cn+1,1One terminal of (C), a capacitorn+1,1Are respectively connected with an inductor L at the other endn+1,2One terminal of (1), diode Dn+1Anode of (2), inductor Ln+1,2The other end of the capacitor C is connected with a capacitor Cn+1,2One terminal of (C), a capacitorn+1,2Another terminal of (1), power switch Sn+1The source electrodes of the first and second transistors are all connected with a grounding terminal;
diode D in the 1 st extension unit2Is connected to the capacitor C in the basic Cuk converter12One end of (a);
capacitance C in the 1 st extension cell22The other end of the first capacitor is connected with a capacitor C in the basic Cuk converter12The other end of (a);
the connection relationship among the extension units is as follows:
capacitance C in the 1 st extension cell22One end of the diode D is connected with the 2 nd extension unit3The capacitor C in the 1 st extension unit22The other end is connected with a capacitor C in the 2 nd extension unit32The other end of (a);
capacitance C in the 2 nd extension unit32One end of the diode D is connected with the 3 rd extension unit4The capacitor C in the 2 nd extension unit32The other end is connected with a capacitor C in the 3 rd extension unit42The other end of (a);
..
C in the n-1 th extension unitn2One end of the D in the n expansion unit is connectedn+1The cathode of (1), C in the (n-1) th extension unitn2The other end is connected with C in the nth extension unitn+1,2The other end of (a);
one end of a load R is connected with a capacitor C in the basic Cuk converter12The other end of the load R is connected with C in the nth extension unitn+1,2One end of the tube.
The power switch S1、S2、S3.....Sn+1The gates of which are connected to a controller, the duty cycle of which can be varied from 0 to 1, a power switch S2、S3.....Sn+1When any one of the circuits is damaged, the whole circuit can continue to work normally.
When the number of the extension units is 2, the invention provides a single-input high-reliability Cuk DC-DC converter, which comprises:
basic Cuk converter, 2 expansion units;
the basic Cuk converter comprises an inductance L11、L12Capacitor C11、C12Power switch S1Diode D1(ii) a Wherein: inductor L11Is connected with a DC input source uinPositive electrode of (1), inductor L11Are respectively connected with a power switch S1Drain electrode of (1), capacitor C11One terminal of (C), a capacitor11Are respectively connected with an inductor L at the other end12One terminal of (1), diode D1Anode of (2), inductor L12The other end of the capacitor C is connected with a capacitor C12One terminal of (1), power switch S1Source electrode of (2), diode D1And a capacitor C12The other ends of the two are connected with a direct current input source uinThe negative electrode of (1);
the 1 st extension unit comprises an inductor L21、L22Capacitor C21、C22Diode D2Power switch S2(ii) a Wherein: feeling L21One end of the first switch is connected with a direct current input source uinPositive electrode of (1), inductor L21Are respectively connected with a power switch S2Drain electrode of (1), capacitor C21One terminal of (C), a capacitor21Are respectively connected with an inductor L at the other end22One terminal of (1), diode D2Anode of (2), inductor L22The other end of the capacitor C is connected with a capacitor C22One terminal of (C), a capacitor22Another terminal of (1), power switch S2The source electrodes of the first and second transistors are all connected with a grounding terminal;
the 2 nd extension unit comprises an inductor L31、L32Capacitor C31、C32Diode D3Power switch S3(ii) a Wherein: inductor L31Is connected with a DC input source uinPositive electrode of (1), inductor L31Are respectively connected with a power switch S3Drain electrode of (1), capacitor C31One terminal of (C), a capacitor31Are respectively connected with an inductor L at the other end32One terminal of (1), diode D3Anode of (2), inductor L32The other end of the capacitor C is connected with a capacitor C32One terminal of (C), a capacitor32Another terminal of (1), power switch S3The source electrodes of the first and second transistors are all connected with a grounding terminal;
diode D in the 1 st extension unit2Is connected to the capacitor C in the basic Cuk converter12One end of (a);
capacitance C in the 1 st extension cell22The other end of the first capacitor is connected with a capacitor C in the basic Cuk converter12The other end of (a);
the connection relationship among the extension units is as follows:
capacitance C in the 1 st extension cell22One end of the diode D is connected with the 2 nd extension unit3The capacitor C in the 1 st extension unit22The other end is connected with a capacitor C in the 2 nd extension unit32The other end of (a);
one end of a load R is connected with a capacitor C in the basic Cuk converter12And the other end of the load R is connected with C in the 2 nd extension unit32One end of the tube.
The invention discloses a single-input high-reliability Cuk DC-DC converter, which has the following technical effects:
1) the buck-boost can be realized simultaneously, and the input and output gains are high. When the inductor current is continuously conducted, the following details are provided:
voltage input output gain
Figure BDA0003297643810000041
The voltage stress of the switching tube is as follows:
Figure BDA0003297643810000042
the voltage stress of the diode is:
Figure BDA0003297643810000043
voltage on each output capacitor:
Figure BDA0003297643810000044
wherein: and D is the duty cycle.
2) When power switch S2、S3.....Sn+1When any one of them is damaged, the other circuits can work normally.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Fig. 2 is a schematic diagram of a conventional Cuk converter circuit.
FIG. 3 is a circuit topology diagram of the Cuk-like expansion unit of the present invention with the number of 2.
FIG. 4 is a graph comparing the input and output gains of the Cuk-like expansion unit of the present invention with those of the conventional Cuk converter when the number of Cuk-like expansion units is 2.
Fig. 5 is a simulation diagram of an output waveform when the input voltage is 30V and the number of Cuk extension units is 2 and D is 0.6 according to the present invention.
Fig. 6 is a simulation diagram of an output waveform when the switching tube S3 is broken when the input voltage is 30V, the number of Cuk extension units is 2, and D is 0.6 according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 3 shows a circuit topology diagram when the number of Cuk-like extension units is 2 according to the present invention:
a single-input high-reliability Cuk DC-DC converter comprises a direct current input source, a basic Cuk converter and 2 structural units similar to the Cuk converter;
wherein: the basic Cuk converter comprises two inductors L11、L12Two capacitors C11、C12A power switch S1A diode D1(ii) a The connection form is as follows: inductor L11Is connected with a DC input source uinPositive electrode of (1), inductor L11Are respectively connected with a power switch S1Drain electrode of (1) and capacitor C11One terminal of (C), a capacitor11The other end of the first and second inductors are respectively connected with the inductor L12ToTerminal and diode D1Is connected with the anode of the inductor L12Another terminal of (1) and a capacitor C12Are connected to one end of a power switch S1Source electrode of (2), diode D1Cathode and capacitor C12Another end of (1) and a DC input source uinThe negative electrodes are connected;
the 1 st Cuk-like cell includes two inductors L21、L22Two capacitors C21、C22Diode D2A power switch S2(ii) a Inductor L21Is connected with a DC input source uinPositive electrode of (1), inductor L21Are respectively connected with a power switch S2Drain electrode of (1) and capacitor C21One terminal of (C), a capacitor21The other end of the first and second inductors are respectively connected with the inductor L22And a diode D2Is connected with the anode of the inductor L22Another terminal of (1) and a capacitor C22Are connected to one end of C22And a terminal of the power switch S2The sources of the first and second transistors are all grounded;
the 2 nd Cuk-like cell includes two inductors L31、L32Two capacitors C31、C32Diode D3A power switch S3(ii) a Inductor L31Is connected with a DC input source uinPositive electrode of (1), inductor L31Are respectively connected with a power switch S3Drain electrode of (1) and capacitor C31One terminal of (C), a capacitor31The other end of the first and second inductors are respectively connected with the inductor L32And a diode D3Is connected with the anode of the inductor L32Another terminal of (1) and a capacitor C32Are connected to one end of C32And a terminal of the power switch S3The sources of the first and second transistors are all grounded;
the connection relationship between the first Cuk-like expansion unit and the basic Cuk converter is as follows:
positive pole of direct current power supply in basic Cuk converter and first Cuk-like extension unit L21Is connected to one end of a diode D of a first Cuk-like extension unit2And inductor L in basic Cuk converter12And a capacitor C12Connected point-to-point, capacitor C22And the other end of the same and the basic Cuk converterDiode D in1Cathode and capacitor C12To the connected ground
The connection relationship among the Cuk extension units of various classes is as follows:
inductance L of 1 st Cuk-like gain expansion unit21One end of which is connected to the inductance L of the 2 nd Cuk-like gain expansion unit31One end of (a); diode D of 2 nd Cuk-like gain expansion unit3The 1 st class Cuk gain expansion unit of the cathode22And a capacitor C22Are connected with each other, and the capacitor C of the 2 nd Cuk-like gain expansion unit32And the other end of the same capacitor C of the 1 st Cuk-like gain expansion unit22And the other end of the two are connected.
One end of a load R and a diode D in a basic Cuk circuit1Cathode and capacitor C12The other end of the load R is connected with the capacitor C in the 2 nd Cuk-like extension unit32One end of (1) and an inductor L32The other ends of the two are connected with each other at the intersection point.
The power switches S1, S2 and S3 have their gates connected to their controllers and their duty cycles can be varied from 0 to 1. The on-off time of the power switches S1, S2 and S3 can be controlled by adjusting the duty ratio, and the output voltage level can be adjusted according to the voltage balance formula of the inductor.
When the number of cuk-like expansion units is equal to 2, and when the inductive current is continuously conducted, the circuit can be divided into 2 working states according to the difference of the power switch:
(1): power switch S1、S2And S3Conducting, diode D1、D2And D3Are all turned off. Inductor L11、L12、L21、L22、L31、L31The terminal voltage is shown as follows:
Figure BDA0003297643810000061
(2): power switch S1、S2And S3Turn-off, diode all D1、D2And D3And conducting. Inductor L11、L12、L21、L22、L31、L31The terminal voltage is shown as follows:
Figure BDA0003297643810000062
from the duty cycles of the controllers connected to the gates of the power switches S1, S2, and S3, the voltage levels across each capacitor can be derived as follows:
Figure BDA0003297643810000071
fig. 4 is a graph comparing the input/output gain of the Cuk-like expansion unit of the present invention with the input/output gain of the conventional Cuk converter, where the number of Cuk-like expansion units is 2. As can be seen from fig. 4, the gain of the proposed converter is 3 times that of the conventional converter at the same duty cycle.
Fig. 5 is a simulation diagram of an output waveform when the input voltage is 30V and the number of Cuk-like expansion units is 2 and D is 0.6 according to the present invention. The feasibility of the invention is verified by simulation.
Fig. 6 is a simulation diagram of an output waveform when the switching tube S3 is broken when the input voltage is 30V, the number of Cuk-like extension units is 2, and D is 0.6 according to the present invention. The simulation verifies the reliability of the invention.

Claims (4)

1. A single-input high-reliability Cuk DC-DC converter, the converter comprising:
a basic Cuk converter, n expansion units;
the basic Cuk converter comprises an inductance L11、L12Capacitor C11、C12Power switch S1Diode D1(ii) a Wherein: inductor L11Is connected with a DC input source uinPositive electrode of (1), inductor L11Are respectively connected with a power switch S1Drain electrode of (1), capacitor C11One terminal of (C), a capacitor11Are respectively connected with the other ends ofInductor L12One terminal of (1), diode D1Anode of (2), inductor L12The other end of the capacitor C is connected with a capacitor C12One terminal of (1), power switch S1Source electrode of (2), diode D1And a capacitor C12The other ends of the two are connected with a direct current input source uinThe negative electrode of (1);
among the n extension units:
the 1 st extension unit comprises an inductor L21、L22Capacitor C21、C22Diode D2Power switch S2(ii) a Wherein: feeling L21One end of the first switch is connected with a direct current input source uinPositive electrode of (1), inductor L21Are respectively connected with a power switch S2Drain electrode of (1), capacitor C21One terminal of (C), a capacitor21Are respectively connected with an inductor L at the other end22One terminal of (1), diode D2Anode of (2), inductor L22The other end of the capacitor C is connected with a capacitor C22One terminal of (C), a capacitor22Another terminal of (1), power switch S2The source electrodes of the first and second transistors are all connected with a grounding terminal;
the 2 nd extension unit comprises an inductor L31、L32Capacitor C31、C32Diode D3Power switch S3(ii) a Wherein: inductor L31Is connected with a DC input source uinPositive electrode of (1), inductor L31Are respectively connected with a power switch S3Drain electrode of (1), capacitor C31One terminal of (C), a capacitor31Are respectively connected with an inductor L at the other end32One terminal of (1), diode D3Anode of (2), inductor L32The other end of the capacitor C is connected with a capacitor C32One terminal of (C), a capacitor32Another terminal of (1), power switch S3The source electrodes of the first and second transistors are all connected with a grounding terminal;
.... analogize, of n expansion units:
the nth expansion unit comprises an inductor Ln+1,1、Ln+1,2Capacitor Cn+1,1、Cn+1,2Diode Dn+1Power switch Sn+1(ii) a Wherein: inductor Ln+1,1Is connected with a DC input source uinPositive electrode of (1), inductor Ln+1,1Are respectively connected with a power switch Sn+1Drain electrode of (1), capacitor Cn+1,1One terminal of (C), a capacitorn+1,1Are respectively connected with an inductor L at the other endn+1,2One terminal of (1), diode Dn+1Anode of (2), inductor Ln+1,2The other end of the capacitor C is connected with a capacitor Cn+1,2One terminal of (C), a capacitorn+1,2Another terminal of (1), power switch Sn+1The source electrodes of the first and second transistors are all connected with a grounding terminal;
diode D in the 1 st extension unit2Is connected to the capacitor C in the basic Cuk converter12One end of (a);
capacitance C in the 1 st extension cell22The other end of the first capacitor is connected with a capacitor C in the basic Cuk converter12The other end of (a);
the connection relationship among the extension units is as follows:
capacitance C in the 1 st extension cell22One end of the diode D is connected with the 2 nd extension unit3The capacitor C in the 1 st extension unit22The other end is connected with a capacitor C in the 2 nd extension unit32The other end of (a);
capacitance C in the 2 nd extension unit32One end of the diode D is connected with the 3 rd extension unit4The capacitor C in the 2 nd extension unit32The other end is connected with a capacitor C in the 3 rd extension unit42The other end of (a);
..
C in the n-1 th extension unitn2One end of the D in the n expansion unit is connectedn+1The cathode of (1), C in the (n-1) th extension unitn2The other end is connected with C in the nth extension unitn+1,2The other end of (a);
one end of a load R is connected with a capacitor C in the basic Cuk converter12The other end of the load R is connected with C in the nth extension unitn+1,2One end of the tube.
2. The single-input high-reliability Cuk DC-DC converter according to claim 1, wherein: the power switch S1、S2、S3.....Sn+1The gates of which are connected to a controller, the duty cycle of which can be varied from 0 to 1, a power switch S2、S3.....Sn+1When any one of the circuits is damaged, the whole circuit can continue to work normally.
3. A single-input high-reliability Cuk DC-DC converter is characterized in that: the system comprises a basic Cuk converter and 2 expansion units; the basic Cuk converter comprises an inductance L11、L12Capacitor C11、C12Power switch S1Diode D1(ii) a Wherein: inductor L11Is connected with a DC input source uinPositive electrode of (1), inductor L11Are respectively connected with a power switch S1Drain electrode of (1), capacitor C11One terminal of (C), a capacitor11Are respectively connected with an inductor L at the other end12One terminal of (1), diode D1Anode of (2), inductor L12The other end of the capacitor C is connected with a capacitor C12One terminal of (1), power switch S1Source electrode of (2), diode D1And a capacitor C12The other ends of the two are connected with a direct current input source uinThe negative electrode of (1);
the 1 st extension unit comprises an inductor L21、L22Capacitor C21、C22Diode D2Power switch S2(ii) a Wherein: feeling L21One end of the first switch is connected with a direct current input source uinPositive electrode of (1), inductor L21Are respectively connected with a power switch S2Drain electrode of (1), capacitor C21One terminal of (C), a capacitor21Are respectively connected with an inductor L at the other end22One terminal of (1), diode D2Anode of (2), inductor L22The other end of the capacitor C is connected with a capacitor C22One terminal of (C), a capacitor22Another terminal of (1), power switch S2The source electrodes of the first and second transistors are all connected with a grounding terminal;
the 2 nd extension unit comprises an inductor L31、L32Capacitor C31、C32Diode D3Power switch S3(ii) a Wherein: inductor L31Is connected with a DC input source uinPositive electrode of (1), inductor L31Are respectively connected with a power switch S3Drain electrode of (1), capacitor C31One terminal of (C), a capacitor31Are respectively connected with an inductor L at the other end32One terminal of (1), diode D3Anode of (2), inductor L32The other end of the capacitor C is connected with a capacitor C32One terminal of (C), a capacitor32Another terminal of (1), power switch S3The source electrodes of the first and second transistors are all connected with a grounding terminal;
diode D in the 1 st extension unit2Is connected to the capacitor C in the basic Cuk converter12One end of (a);
capacitance C in the 1 st extension cell22The other end of the first capacitor is connected with a capacitor C in the basic Cuk converter12The other end of (a);
the connection relationship among the extension units is as follows:
capacitance C in the 1 st extension cell22One end of the diode D is connected with the 2 nd extension unit3The capacitor C in the 1 st extension unit22The other end is connected with a capacitor C in the 2 nd extension unit32The other end of (a);
one end of a load R is connected with a capacitor C in the basic Cuk converter12And the other end of the load R is connected with C in the 2 nd extension unit32One end of the tube.
4. The single-input high-reliability Cuk DC-DC converter according to claim 3, wherein: when the number of the expansion units is equal to 2, and when the inductive current is continuously conducted, the circuit can be divided into 2 working states according to different power switches:
(1): power switch S1、S2And S3Conducting, diode D1、D2、D3All are turned off; inductor L11、L12、L21、L22、L31、L31The terminal voltage is shown as follows:
Figure FDA0003297643800000031
(2): power switch S1、S2And S3Turn-off, diode D1、D2And D3Are all conducted; inductor L11、L12、L21、L22、L31、L31The terminal voltage is shown as follows:
Figure FDA0003297643800000041
CN202111181980.6A 2021-10-11 2021-10-11 Single-input high-reliability Cuk DC-DC converter Pending CN113965080A (en)

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