CN111371315B - Zero-input-current ripple high-gain DC-DC converter - Google Patents

Zero-input-current ripple high-gain DC-DC converter Download PDF

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CN111371315B
CN111371315B CN202010288026.6A CN202010288026A CN111371315B CN 111371315 B CN111371315 B CN 111371315B CN 202010288026 A CN202010288026 A CN 202010288026A CN 111371315 B CN111371315 B CN 111371315B
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diode
capacitor
inductor
current
input
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CN111371315A (en
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林国庆
洪建超
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Fuzhou University
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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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

The invention relates to a zero-input-current-ripple high-gain DC-DC converter. The direct-current power supply circuit comprises a direct-current input power supply, a switching tube, a coupling inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a load. The zero-input-current-ripple high-gain direct-current converter combines the coupling inductance transformation ratio boosting, the capacitance diode boosting network and the clamping capacitor, realizes high voltage gain, zero-input ripple, high conversion efficiency and the like, and is very suitable for new energy power generation application occasions requiring high boosting ratio, such as photovoltaics, fuel cells and the like.

Description

Zero-input-current ripple high-gain DC-DC converter
Technical Field
The invention relates to the technical field of power electronics, in particular to a zero-input-current-ripple high-gain DC-DC converter.
Background
In recent years, with the reduction in the reserve of primary energy and the increasing demand for electric power, development and utilization of green renewable energy such as solar energy and fuel cells have been drawing attention worldwide. However, the power output of renewable energy sources such as photovoltaic cells and fuel cells is generally low direct-current voltage that varies in a wide range, and therefore DC-DC converters with high gain are required to boost them to a higher direct-current voltage to meet grid-connected power generation or load requirements.
After a high-frequency transformer is introduced into a traditional isolated high-gain DC-DC converter for boosting, the traditional isolated high-gain DC-DC converter has many defects in energy transfer efficiency and system volume compared with a non-isolated boost DC converter, and thus research on the non-isolated boost DC-DC converter draws extensive attention. Non-isolated boost converters typically employ a capacitive diode network boost and a coupled inductor ratio boost. The capacitor diode boosting network has the main advantages that no magnetic device is generally arranged in the capacitor diode boosting network, integration is easy, power density is high, any voltage output is difficult to achieve, and high-gain conversion is easy to achieve by setting the turn ratio of the coupling inductor to improve voltage gain by adopting coupling inductor boosting. Both of them can be used to increase the voltage gain, but the limitation is large to obtain a higher voltage gain. In order to further improve the voltage gain, the invention combines the two schemes together to form a high-gain DC-DC converter.
In addition, in a new energy power generation system such as a solar cell panel or a fuel cell, in addition to the necessity of a high-gain DC-DC converter, since the service life and power generation efficiency of the solar cell panel or the fuel cell are greatly affected by the input current ripple of the DC-DC converter, how to suppress the input current ripple of the DC-DC converter and further improve the performance of the converter has also been gaining attention from a wide range of researchers.
Disclosure of Invention
The invention aims to provide a zero-input-current-ripple high-gain DC-DC converter, which realizes high voltage gain, zero-input ripple, high conversion efficiency and the like by combining a coupling inductance transformation ratio boost network, a capacitance diode boost network and a clamping capacitor, and is very suitable for new energy power generation application occasions requiring high transformation ratio, such as photovoltaics, fuel cells and the like.
In order to achieve the purpose, the technical scheme of the invention is as follows: a zero-input-current-ripple high-gain DC-DC converter comprises a DC input power supply, a switching tube, a coupling inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a load; the positive pole of the direct current input power supply is connected with one end of a first inductor and one end of a first capacitor through a second inductor, the negative pole of the direct current input voltage is connected with the source electrode of a switch tube, one end of a second capacitor, one end of a fifth capacitor and one end of a load, the other end of the first inductor is connected with the anode of a first diode and the anode of a second diode, the other end of the first capacitor is connected with the cathode of a first diode, one end of a third capacitor and the first end of a primary winding of a coupling inductor, the cathode of the second diode is connected with the drain electrode of the switch tube, the second end of the primary winding of the coupling inductor, the anode of the third diode and the first end of a secondary winding of the coupling inductor, the second end of the secondary winding of the coupling inductor is connected with one end of a fourth capacitor, the other end of the third capacitor is connected with the other end of the second capacitor, the cathode of the third diode and the, and the cathode of the fourth diode is connected with the anode of the fifth diode and the other end of the fourth capacitor, and the cathode of the fifth diode is connected with the other end of the fifth capacitor and the other end of the load.
In an embodiment of the invention, the zero-input-current-ripple high-gain DC-DC converter combines a coupling inductor transformation ratio boost, a capacitor diode boost network and a clamping capacitor to realize the functions of high gain and zero input current ripple.
In an embodiment of the present invention, the zero-input-current-ripple high-gain DC-DC converter utilizes clamping effects of the first capacitor, the second capacitor, and the third capacitor to make a voltage across the second inductor approach zero, so as to implement zero-input-current ripple.
In an embodiment of the invention, the voltage gain of the zero-input-current-ripple high-gain DC-DC converter is
Figure GDA0002957354930000021
Wherein n is the turn ratio of the secondary side and the primary side of the coupling inductor, and D is the working duty ratio of the switching tube.
In an embodiment of the present invention, the zero-input-current-ripple high-gain DC-DC converter operates as follows:
(1) mode 1 (t)0-t1)：t0At the moment, the switch tube S is conducted and the second diode VD2The fifth diode VDoConducting, the first diode VD1A third diode VD3And a fourth diode VD4Cutting off; DC input power supply VinThrough a second diode VD2And a switching tube S for the first inductor L1Charging, inductor current iL1A linear increase; DC input power supply VinAnd a second inductor LaA first capacitor C1The primary side current i is connected in series to charge the primary side winding excitation inductor of the coupling inductor through a switching tube SpA linear rapid increase; coupling the secondary winding of the inductor with a fourth capacitor C4Series through output fifth diode VDoTransferring energy to the load side; second capacitor C2Through the switch tube S to the third capacitor C3Discharge when t is1At time instant, the fifth diode VDoCurrent iVDoWhen the value is reduced to 0, the mode is ended;
(2) mode 2 (t)1-t2): the switch tube S is continuously conducted, and the second diode VD2And a fourth diode VD4Conducting, first diode VD1A third diode VD3The fifth diode VDoCutting off; DC input power supply VinAnd a second inductor LaA first capacitor C1Are connected in series and supply the primary winding excitation inductance L of the coupling inductance through the switching tube SmCharging, exciting current iLmLinearly increasing; DC input power supply VinContinues to pass through the switch tube S and the second diode VD2For the first inductance L1Charging, inductor current iL1Linearly increasing; coupling inductor secondary winding and second capacitor C2Is connected in series through a switching tube S and a fourth diode VD4To a fourth capacitor C4Charging; second capacitor C2Through the switch tube S to the third capacitor C3Continuing discharging; fifth capacitor CoProviding energy to a load R when t2At the moment, the switching tube S is turned off, and the mode is ended;
(3) mode 3 (t)2-t3)：t2The switch tube S is turned off at any time, and the first diode VD1A third diode VD3And a fourth diode VD4Conducting, the second diode VD2The fifth diode VDoCutting off; DC input power supply VinAnd a second inductor LaA first capacitor C1A third capacitor C3Are connected in series to a second capacitor C2Charging, first inductance L1Through a first diode VD1For the first capacitor C1Discharge, inductor current iL1Decrease; coupled inductor primary winding leakage inductance LkEnergy passes through a third diode VD3Is covered by a third capacitor C3Absorbing, primary side current ipA rapid decrease; the secondary winding of the coupling inductor passes through a third diode VD3And a fourth diode VD4Continue to supply the fourth capacitor C4Charging, and rapidly reducing the current of the secondary winding; fifth capacitor CoProviding energy to a load R when t3Time of day, secondary sideWhen the winding current is reduced to 0, the fourth diode VD4Turning off, and ending the mode;
(4) mode 4 (t)3-t4): the switch tube S is continuously turned off, and the first diode VD1A third diode VD3The fifth diode VDoConducting, the second diode VD2And a fourth diode VD4Cutting off; DC input power supply VinAnd a second inductor LaA first capacitor C1A third capacitor C3Are connected in series to a second capacitor C2Charging, first inductance L1Through a first diode VD1For the first capacitor C1Discharge, inductor current iL1Decrease; the primary winding excitation inductor of the coupling inductor passes through a third diode VD3For the third capacitor C3Charging, exciting current iLmDecrease; coupling the secondary winding of the inductor with a second capacitor C2A fourth capacitor C4Series connection third diode VD3The fifth diode VDoTransfer of energy to the load side, t4At the moment, flows through the third diode VD3Current i ofVD3At 0, this mode ends;
(5) mode 5 (t)4-t5): the switch tube S is kept off, and the first diode VD1The fifth diode VDoConducting, the second diode VD2A third diode VD3And a fourth diode VD4Cutting off; DC input power supply VinAnd a second inductor LaA first capacitor C1A third capacitor C3Are connected in series to a second capacitor C2Charging, first inductance L1Through a first diode VD1For the first capacitor C1Discharge, inductor current iL1Decrease; coupling inductance primary winding, secondary winding and second capacitor C2A third capacitor C3A fourth capacitor C4Series connection fifth diode VDoTransferring energy to the load side, primary current ipWith excitation current iLmContinues to decrease when t5At the moment, when the switching tube S is switched on, the mode is ended, and the next switching period is started.
Compared with the prior art, the invention has the following beneficial effects: the zero-input-current-ripple high-gain DC-DC converter combines the coupling inductance transformation ratio boosting, the capacitance diode boosting network and the clamping capacitor, realizes high voltage gain, small zero-input ripple, high conversion efficiency and the like, and is very suitable for new energy power generation application occasions requiring high boosting ratio, such as photovoltaics, fuel cells and the like.
Drawings
Fig. 1 shows a zero-input-current-ripple high-gain DC-DC converter according to the present invention.
Fig. 2 is an equivalent circuit of each mode of the zero-input-current-ripple high-gain DC-DC converter of the present invention.
Fig. 3 shows the main operating waveforms of the zero-input-current-ripple high-gain DC-DC converter of the present invention.
Fig. 4 is a main current simulation waveform of the zero-input-current-ripple high-gain DC-DC converter of the invention.
Fig. 5 shows the main voltage simulation waveforms of the zero-input-current-ripple high-gain DC-DC converter of the present invention.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention provides a zero-input-current-ripple high-gain DC-DC converter, which comprises a direct-current input power supply, a switching tube, a coupling inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a load, wherein the switching tube is connected with the coupling inductor; the positive pole of the direct current input power supply is connected with one end of a first inductor and one end of a first capacitor through a second inductor, the negative pole of the direct current input voltage is connected with the source electrode of a switch tube, one end of a second capacitor, one end of a fifth capacitor and one end of a load, the other end of the first inductor is connected with the anode of a first diode and the anode of a second diode, the other end of the first capacitor is connected with the cathode of a first diode, one end of a third capacitor and the first end of a primary winding of a coupling inductor, the cathode of the second diode is connected with the drain electrode of the switch tube, the second end of the primary winding of the coupling inductor, the anode of the third diode and the first end of a secondary winding of the coupling inductor, the second end of the secondary winding of the coupling inductor is connected with one end of a fourth capacitor, the other end of the third capacitor is connected with the other end of the second capacitor, the cathode of the third diode and the, and the cathode of the fourth diode is connected with the anode of the fifth diode and the other end of the fourth capacitor, and the cathode of the fifth diode is connected with the other end of the fifth capacitor and the other end of the load.
The following is a specific implementation of the present invention.
As shown in fig. 1, the zero-input-current-ripple high-gain DC-DC converter of the present invention includes a DC input power supply, a switching tube, a coupling inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a load.
When the value of the clamping capacitor is large enough, the zero-input-current ripple high-gain DC-DC converter utilizes the capacitor C1、C2And C3Clamping of the inductor LaVoltage across
Figure GDA0002957354930000041
Namely, it is
Figure GDA0002957354930000042
Zero input current ripple is achieved.
The high-gain DC-DC converter of the present invention has a voltage gain of
Figure GDA0002957354930000043
Wherein n is the turn ratio of the secondary side and the primary side of the coupling inductor, and D is the working duty ratio of the switching tube.
The working principle of the zero-input-current-ripple high-gain DC-DC converter is as follows:
to simplify the analysis, the following assumptions were made:
1) capacitor C1、C2、C3、C4、CoLarge enough value and two capacitorsThe terminal voltage ripple is ignored;
2) the switch tube and the diode are ideal devices;
3) excitation inductance much greater than leakage inductance, i.e. Lm＞＞Lk。
For the purpose of principle analysis, the primary winding L in FIG. 1 is provided2And secondary winding L3The formed coupling inductor is equivalent to an excitation inductor LmAnd an ideal transformer (the number of primary and secondary turns is N respectively)pAnd Ns) Leakage inductance L of primary side parallel connection and coupling inductancekAre connected in series. The zero-input-current-ripple high-gain DC-DC converter has 5 working modes in one switching period, an equivalent circuit of each mode is shown in figure 2, and main working waveforms are shown in figure 3.
1) Mode 1 (t)0-t1)：t0At the moment, the switch tube S is conducted and the diode VD2、VDoConducting diode VD1、VD3、VD4The modal equivalent circuit of the cutoff is shown in fig. 2 (a). Input power supply VinThrough a diode VD2And a switch tube S to an inductor L1Charging, inductor current iL1A linear increase; input power supply VinAnd an input inductance LaCapacitor C1The primary side excitation inductor is connected in series to charge the coupling inductor through a switching tube S, and the primary side current ipA linear rapid increase; secondary winding and capacitor C4Series pass output diode VDoTransferring energy to the load side; capacitor C2Through S-direction capacitor C of switch tube3And (4) discharging. When t is1Time diode VDoCurrent iVDoWhen the value decreases to 0, the mode ends.
2) Mode 2 (t)1-t2): the switch tube S is continuously conducted and the diode VD2、VD4Conducting diode VD1、VD3、VDoThe modal equivalent circuit of the cutoff is shown in fig. 2 (b). Input power supply VinAnd an input inductance LaCapacitor C1Are connected in series and supply primary side excitation inductance L of coupling inductance through switching tube SmCharging, exciting current iLmLinearly increasing; transfusion systemInput power supply VinContinuously passes through a switch tube S and a diode VD2To the inductance L1Charging, inductor current iL1Linearly increasing; coupling inductor secondary winding and capacitor C2Is connected in series through a switching tube S and a diode VD4Capacitor C4Charging; capacitor C2Through S-direction capacitor C of switch tube3Continuing discharging; output capacitor CoProviding energy to a load R. When t is2The time switch tube S is turned off, and the mode is ended.
3) Mode 3 (t)2-t3)：t2The switch tube S is turned off at any moment, and the diode VD1、VD3、VD4Conducting diode VD2、VDoThe modal equivalent circuit of the cutoff is shown in fig. 2 (c). Input power supply VinAnd an input inductance LaCapacitor C1、C3Are connected in series to a capacitor C2Charging, inductance L1Through a diode VD1To the capacitor C1Discharge, inductor current iL1Decrease; coupled inductor leakage inductance LkEnergy passes through diode VD3By capacitor C3Absorbing, primary side current ipA rapid decrease; the secondary winding of the coupling inductor passes through a diode VD3、VD4Continuously supplying the capacitor C4Charging, and rapidly reducing the current of the secondary winding; output capacitor CoProviding energy to a load R. When t is3When the current of the secondary winding is reduced to 0 at the moment, the diode VD4Turn off, this modality ends.
4) Mode 4 (t)3-t4): the switch tube S is continuously turned off and the diode VD1、VD3、VDoConducting diode VD2、VD4The modal equivalent circuit of the cutoff is shown in fig. 2 (d). Input power supply VinAnd an input inductance LaCapacitor C1、C3Are connected in series to a capacitor C2Charging, inductance L1Through a diode VD1To the capacitor C1Discharge, inductor current iL1Decrease; primary side excitation inductor of coupling inductor passes through diode VD3To the capacitor C3Charging, exciting current iLmDecrease; coupling inductorSecondary winding and capacitor C2、C4Series pass diode VD3Diode VDoTransfer of energy to the load side, t4Constantly flowing through diode VD3Current i ofVD3 At 0, this mode ends.
Mode 5 (t)4-t5): switch tube S remains off, diode VD1、VDoConducting diode VD2、VD3、VD4The modal equivalent circuit of the cutoff is shown in fig. 2 (e). Input power supply VinAnd an input inductance LaCapacitor C1、C3Are connected in series to a capacitor C2Charging, inductance L1Through a diode VD1To the capacitor C1Discharge, inductor current iL1Decrease; coupling inductor primary side, secondary side and capacitor C2、C3、C4Series pass diode VDoTransferring energy to the load side, primary current ipWith excitation current iLmThe decrease continues. When t is5When the switching tube S is switched on at the moment, the mode is ended, and the next switching period is started.
Characterization of a feature
(1) Voltage gain
By an inductance La、L1、LmThe voltage-second balance can obtain the expression of each capacitor voltage and output voltage as
Figure GDA0002957354930000061
Figure GDA0002957354930000062
Figure GDA0002957354930000063
Figure GDA0002957354930000064
Figure GDA0002957354930000065
Then the voltage gain
Figure GDA0002957354930000066
In the formula, VinFor input voltage, VoIn order to output the voltage, the voltage is,
Figure GDA0002957354930000067
d is the duty cycle of the switching tube.
(2) Zero input current characteristic
For the inductance LaThe voltage across it is:
Figure GDA0002957354930000068
when the capacitance C1And C2When the value is large enough, the voltage ripple of each capacitor is ignored, and then:
Vin+vC1+vC3-vC2≈Vin+VC1+VC3-VC2＝0
thus the inductance LaVoltage at both ends:
Figure GDA0002957354930000069
therefore, as long as the selected capacitance is large enough to make the inductor LaInput inductance L with sufficiently small voltage ripple across it, even smallaZero input current ripple can also be achieved.
In order to verify the feasibility of the circuit, the proposed circuit is simulated, and the simulation parameters are as follows: input voltage Vin＝36V,V0380V, inductance La＝30uH、L1＝350uH、Lm297uH, coupled inductor turns1, capacitance C1＝C2＝C3＝C4＝22uF、Co22uF, 1444 Ω, and 0.4669.
FIGS. 4 and 5 are the main simulation waveforms, and it can be seen that the input inductance LaThe current is almost a straight line, and the ripple wave of the input inductive current is close to zero; the simulated value of the output voltage is V0378.78V, the gain is 10.52, and the theoretical calculation value
Figure GDA0002957354930000071
Almost equal, and the simulation result is consistent with the theoretical analysis.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.

Claims (5)

1. A zero-input-current ripple high-gain DC-DC converter is characterized by comprising a DC input power supply, a switching tube, a coupling inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a load; the positive pole of the direct current input power supply is connected with one end of a first inductor and one end of a first capacitor through a second inductor, the negative pole of the direct current input voltage is connected with the source electrode of a switch tube, one end of a second capacitor, one end of a fifth capacitor and one end of a load, the other end of the first inductor is connected with the anode of a first diode and the anode of a second diode, the other end of the first capacitor is connected with the cathode of a first diode, one end of a third capacitor and the first end of a primary winding of a coupling inductor, the cathode of the second diode is connected with the drain electrode of the switch tube, the second end of the primary winding of the coupling inductor, the anode of the third diode and the first end of a secondary winding of the coupling inductor, the second end of the secondary winding of the coupling inductor is connected with one end of a fourth capacitor, the other end of the third capacitor is connected with the other end of the second capacitor, the cathode of the third diode and the, and the cathode of the fourth diode is connected with the anode of the fifth diode and the other end of the fourth capacitor, and the cathode of the fifth diode is connected with the other end of the fifth capacitor and the other end of the load.
2. The zero-input-current-ripple high-gain DC-DC converter according to claim 1, wherein the zero-input-current-ripple high-gain DC-DC converter combines a coupling inductance transformation ratio boost, a capacitance diode boost network and a clamping capacitor to realize the functions of high gain and zero input current ripple.
3. The zero-input-current-ripple high-gain DC-DC converter according to claim 1, wherein the zero-input-current-ripple high-gain DC-DC converter utilizes clamping effects of the first capacitor, the second capacitor and the third capacitor to enable a voltage across the second inductor to approach zero, so as to achieve zero input current ripple.
4. The zero-input-current-ripple high-gain DC-DC converter according to claim 1, wherein the voltage gain of the zero-input-current-ripple high-gain DC-DC converter is
Figure FDA0002957354920000011
Wherein n is the turn ratio of the secondary side and the primary side of the coupling inductor, and D is the working duty ratio of the switching tube.
5. The zero-input-current-ripple high-gain DC-DC converter according to claim 1, wherein the zero-input-current-ripple high-gain DC-DC converter operates as follows:
(1) mode 1 (t)0-t1)：t0At the moment, the switch tube S is conducted and the second diode VD2The fifth diode VDoConducting, the first diode VD1A third diode VD3And a fourth diode VD4Cutting off; DC input power supply VinThrough a second diode VD2And a switching tube S for the first inductor L1Charging, inductive powerStream iL1A linear increase; DC input power supply VinAnd a second inductor LaA first capacitor C1The primary side current i is connected in series to charge the primary side winding excitation inductor of the coupling inductor through a switching tube SpA linear rapid increase; coupling the secondary winding of the inductor with a fourth capacitor C4Series through output fifth diode VDoTransferring energy to the load side; second capacitor C2Through the switch tube S to the third capacitor C3Discharge when t is1At time instant, the fifth diode VDoCurrent iVDoWhen the value is reduced to 0, the mode is ended;
(2) mode 2 (t)1-t2): the switch tube S is continuously conducted, and the second diode VD2And a fourth diode VD4Conducting, first diode VD1A third diode VD3The fifth diode VDoCutting off; DC input power supply VinAnd a second inductor LaA first capacitor C1Are connected in series and supply the primary winding excitation inductance L of the coupling inductance through the switching tube SmCharging, exciting current iLmLinearly increasing; DC input power supply VinContinues to pass through the switch tube S and the second diode VD2For the first inductance L1Charging, inductor current iL1Linearly increasing; coupling inductor secondary winding and second capacitor C2Is connected in series through a switching tube S and a fourth diode VD4To a fourth capacitor C4Charging; second capacitor C2Through the switch tube S to the third capacitor C3Continuing discharging; fifth capacitor CoProviding energy to a load R when t2At the moment, the switching tube S is turned off, and the mode is ended;
(3) mode 3 (t)2-t3)：t2The switch tube S is turned off at any time, and the first diode VD1A third diode VD3And a fourth diode VD4Conducting, the second diode VD2The fifth diode VDoCutting off; DC input power supply VinAnd a second inductor LaA first capacitor C1A third capacitor C3Are connected in series to a second capacitor C2Charging, first inductance L1Through the first stepA diode VD1For the first capacitor C1Discharge, inductor current iL1Decrease; coupled inductor primary winding leakage inductance LkEnergy passes through a third diode VD3Is covered by a third capacitor C3Absorbing, primary side current ipA rapid decrease; the secondary winding of the coupling inductor passes through a third diode VD3And a fourth diode VD4Continue to supply the fourth capacitor C4Charging, and rapidly reducing the current of the secondary winding; fifth capacitor CoProviding energy to a load R when t3At the moment when the secondary winding current is reduced to 0, the fourth diode VD4Turning off, and ending the mode;
(4) mode 4 (t)3-t4): the switch tube S is continuously turned off, and the first diode VD1A third diode VD3The fifth diode VDoConducting, the second diode VD2And a fourth diode VD4Cutting off; DC input power supply VinAnd a second inductor LaA first capacitor C1A third capacitor C3Are connected in series to a second capacitor C2Charging, first inductance L1Through a first diode VD1For the first capacitor C1Discharge, inductor current iL1Decrease; the primary winding excitation inductor of the coupling inductor passes through a third diode VD3For the third capacitor C3Charging, exciting current iLmDecrease; coupling the secondary winding of the inductor with a second capacitor C2A fourth capacitor C4Series connection third diode VD3The fifth diode VDoTransfer of energy to the load side, t4At the moment, flows through the third diode VD3Current i ofVD3At 0, this mode ends;
(5) mode 5 (t)4-t5): the switch tube S is kept off, and the first diode VD1The fifth diode VDoConducting, the second diode VD2A third diode VD3And a fourth diode VD4Cutting off; DC input power supply VinAnd a second inductor LaA first capacitor C1A third capacitor C3Are connected in series to a second capacitor C2Charging, first inductanceL1Through a first diode VD1For the first capacitor C1Discharge, inductor current iL1Decrease; coupling inductance primary winding, secondary winding and second capacitor C2A third capacitor C3A fourth capacitor C4Series connection fifth diode VDoTransferring energy to the load side, primary current ipWith excitation current iLmContinues to decrease when t5At the moment, when the switching tube S is switched on, the mode is ended, and the next switching period is started.
CN202010288026.6A 2020-04-14 2020-04-14 Zero-input-current ripple high-gain DC-DC converter Expired - Fee Related CN111371315B (en)

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