CN111371316A - Zero-input ripple high-gain direct current converter based on coupling inductor - Google Patents
Zero-input ripple high-gain direct current converter based on coupling inductor Download PDFInfo
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- CN111371316A CN111371316A CN202010288254.3A CN202010288254A CN111371316A CN 111371316 A CN111371316 A CN 111371316A CN 202010288254 A CN202010288254 A CN 202010288254A CN 111371316 A CN111371316 A CN 111371316A
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
Abstract
The invention relates to a zero-input ripple high-gain direct current converter based on a coupling inductor. 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 ripple high-gain direct current converter is formed by combining the coupling inductance transformation ratio boosting, the capacitance diode boosting network and the capacitance clamping, has the advantages of high voltage gain, small zero-input ripple, high conversion efficiency and the like, and is very suitable for the application occasions of high-boosting ratio direct current voltage conversion.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a zero-input ripple high-gain direct-current converter based on a coupling inductor.
Background
In a renewable energy power generation system, since many renewable energy sources output a low dc voltage, in order to supply power to a subsequent grid-connected inverter, a high-gain dc converter is required to convert a low-voltage dc into a high-voltage dc suitable for grid connection, and thus a high-efficiency high-gain dc converter is indispensable.
At present, on the basis of a traditional dc converter, the way of increasing the gain of the converter generally includes: the converter is cascaded, the switch capacitor is added, and the coupling inductor is adopted. Although the converter cascade can effectively improve the voltage gain, the defects of complex topological structure and control mode and the like exist, and the loop design is relatively difficult; the boost gain of the switched capacitor circuit is limited, and a plurality of switched capacitor units are needed to obtain higher boost gain, so that the complexity and the cost of the circuit are increased; in an application occasion where electrical isolation is not required, since voltage gain can be increased by setting the turn ratio of the coupling inductor, high-gain conversion is easily achieved, and therefore, a high-boost-gain DC-DC converter based on the coupling inductor is attracting attention.
For new energy resources such as photovoltaic and fuel cell, the input current ripple of the dc converter not only affects the power generation efficiency, but also affects the service life of the photovoltaic cell panel and the fuel cell, and therefore, the low input current ripple and high gain dc converter topology becomes a hot point for research.
Disclosure of Invention
The invention aims to provide a zero-input ripple high-gain direct-current converter based on a coupling inductor, which combines the transformation ratio boosting of the coupling inductor, a capacitor diode boosting network and capacitor clamping together to form the zero-input ripple high-gain direct-current converter, has the advantages of high voltage gain, zero input ripple, high conversion efficiency and the like, and is very suitable for the application occasions of high-boosting ratio direct-current voltage conversion.
In order to achieve the purpose, the technical scheme of the invention is as follows: a zero-input ripple high-gain direct current converter based on a coupling inductor comprises a direct current input power supply, a switch 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 switching tube, one end of a third 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 second capacitor and the first end of a primary winding of a coupling inductor, the other end of the second capacitor is connected with the cathode of a fifth diode, the other end of the fifth capacitor and the other end of the load, the cathode of the second diode is connected with the second end of the primary winding of the coupling inductor, the first end of a secondary winding of the coupling inductor, the drain electrode of the switching tube and the anode of the third diode, and the second end of the secondary winding of the coupling inductor is connected with the, The cathode of the fourth diode is connected, and the cathode of the third diode is connected with the anode of the fourth diode and the other end of the third capacitor.
In an embodiment of the invention, the zero-input ripple high-gain direct current converter is formed by combining a coupling inductor transformation ratio boost, a capacitance diode boost network and a capacitance clamp together, and has the characteristics of high voltage gain, small input current ripple, high conversion efficiency and the like.
In an embodiment of the present invention, the zero-input ripple high-gain dc converter utilizes clamping effects of the first capacitor and the second capacitor to make a voltage across the second inductor approach zero, so as to implement zero-input current ripple.
In an embodiment of the present invention, the zero-input ripple high-gain dc converter has a voltage gain of
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-ripple high-gain 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 VinAnd a second inductor LaA first capacitor C1A second capacitor C2Are connected in series to provide energy for a load side; DC input power supply VinThrough a second diode VD2And a switching tube S for the first inductor L1Charging, inductor current iL1Linearly increasing; DC input power supply VinAnd a second inductor LaA first capacitor C1The leakage inductance L of the primary winding of the coupling inductor is connected in series through a switching tube SkCharging, coupling of inductor primary winding current ipLinear rapid increase, exciting current iLmDecrease; coupling the secondary winding of the inductor with a fourth capacitor C4Is connected in series through a switching tube S and a fifth diode VDoTransferring energy to the load side when t1At 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, the 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 VinThrough a second diode VD2And a switching tube S for the first inductor L1Charging is continued with inductor current iL1Linearly increasing; coupling inductor secondary winding and third capacitor C3Is connected in series through a switching tube S and a fourth diode VD4To a fourth capacitor C4Charging; fifth capacitor CoTo a second capacitance C2Discharging and supplying energy to load R when t2At the moment, the switching tube S is turned off, and the mode is ended;
(3) mode 3 (t)2-t3)：t2At the moment, the switch tube S is turned off and the first diode VD1A third diode VD3And a fourth diode VD4Conducting, the second diode VD2The fifth diodeVDoCutting off; first inductance L1Through a first diode VD1To 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 ipBegin to decrease; the secondary winding of the coupling inductor passes through a third diode VD3And a fourth diode VD4Continue to supply the fourth capacitor C4Charging; fifth capacitor CoProviding energy to a load R when t3Time of day, 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 second capacitor C2Are connected in series to provide energy for a load side; first inductance L1Through a first diode VD1To the first capacitor C1Continuing discharging; coupled inductor primary winding excitation inductor LmEnergy is transferred to a load side through a secondary winding of a coupling inductor, and an exciting current iLmDecrease of primary side current ipContinuing to decrease; coupling the secondary winding of the inductor with a third capacitor C3A fourth capacitor C4Series connection fifth diode VDoTransferring energy to the load side when t4At the moment, flows through the third diode VD3Current i ofVD3 At 0, this mode ends;
(5) mode 5 (t)4-t5): the switch tube S is continuously turned 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 second capacitor C2Are connected in series to provide energy for a load side; first inductance L1Continuing to discharge, inductor current iL1Decrease; coupling inductance primary winding, secondary winding and fourth capacitor C4Series connection fifth diode VDoTo a second capacitance C2Charging, primary side current ipWith excitation current iLmContinues to decrease when t5At that moment, when the switching tube S is turned on, this mode ends and the next switching cycle begins.
Compared with the prior art, the invention has the following beneficial effects: the zero-input-ripple high-gain direct-current converter based on the coupling inductor is formed by combining the coupling inductor transformation ratio boosting, the capacitor diode boosting network and the capacitor clamping, has the advantages of high voltage gain, zero-input ripple, high conversion efficiency and the like, and is very suitable for the application occasions of high-transformation-ratio direct-current voltage conversion.
Drawings
Fig. 1 shows a zero-input ripple high-gain dc converter according to the present invention.
Fig. 2 is an equivalent circuit of each mode of the zero-input ripple high-gain dc converter of the present invention.
Fig. 3 shows the main operating waveforms of the zero-input ripple high-gain dc converter of the present invention.
Fig. 4 shows the main current simulation waveform of the zero-input ripple high-gain dc converter of the present invention.
Fig. 5 is a simulation waveform of the main voltage of the zero-input ripple high-gain 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 ripple high-gain direct current converter based on a coupling inductor, which comprises a direct current input power supply, a switch 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 switch tube is connected with the direct current input power supply; 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 switching tube, one end of a third 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 second capacitor and the first end of a primary winding of a coupling inductor, the other end of the second capacitor is connected with the cathode of a fifth diode, the other end of the fifth capacitor and the other end of the load, the cathode of the second diode is connected with the second end of the primary winding of the coupling inductor, the first end of a secondary winding of the coupling inductor, the drain electrode of the switching tube and the anode of the third diode, and the second end of the secondary winding of the coupling inductor is connected with the, The cathode of the fourth diode is connected, and the cathode of the third diode is connected with the anode of the fourth diode and the other end of the third capacitor.
The following is a specific implementation of the present invention.
As shown in fig. 1, the zero-input ripple high-gain dc converter based on a coupling inductor 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; the zero-input-ripple high-gain direct current converter is formed by combining the coupling inductance transformation ratio boosting, the capacitance diode boosting network and the capacitance clamping, and has the advantages of high voltage gain, small input current ripple, high conversion efficiency and the like.
According to the zero-input ripple high-gain direct current converter based on the coupling inductor, when the capacitor is selected to be large enough, the capacitor C is utilized1、C2Clamping of the inductor LaVoltage across
Namely, it is
Thereby achieving zero input current ripple. The voltage gain of the high-gain DC converter of the invention is
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 ripple high-gain direct-current converter based on the coupling inductor is as follows:
to simplify the analysis, the following assumptions were made:
1) capacitor C1、C2、C3、C4、CoThe value is large enough, and voltage ripples at two ends of the capacitor are 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 ripple high-gain direct-current converter based on the coupling inductor 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 VinAnd an input inductance LaCapacitor C1、C2Are connected in series to provide energy for a load side; input power supply VinThrough a diode VD2And a switch tube S to an inductor L1Charging, inductor current iL1Linearly increasing; input power supply VinAnd an input inductance LaCapacitor C1The series connection gives the leakage inductance L of the coupling inductor through the switch tube SkCharging, primary side current ipLinear rapid increase, exciting current iLmDecrease; secondary winding and electricityContainer C4Serially connected with a switch tube S and a diode VDoEnergy is transferred to the load side. 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; input power supply VinThrough a diode VD2And a switch tube S to an inductor L1Charging is continued with inductor current iL1Linearly increasing; coupling inductor secondary winding and capacitor C3Is connected in series through a switching tube S and a diode VD4Capacitor C4Charging; output capacitor CoTo the capacitor C2Discharging and supplying energy to the 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). Inductor L1Through a diode VD1To the capacitor C1Discharge, inductor current iL1Decrease; coupled inductor leakage inductance LkEnergy passes through diode VD3Clamped capacitor C3Absorbing, primary side current ipBegin to decrease; the secondary winding of the coupling inductor passes through a diode VD3、VD4Continuously supplying the capacitor C4Charging; output capacitor CoProviding energy to a load R. When t is3Time of day, 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、VD4Cutoff, modal equivalent circuit thereofAs shown in fig. 2 (d). Input power supply VinAnd an input inductance LaCapacitor C1、C2Are connected in series to provide energy for a load side; inductor L1Through a diode VD1To the capacitor C1Continuing discharging; coupling inductance primary side excitation inductance LmBy transferring energy to the load side through the secondary winding, the excitation current iLmDecrease of primary side current ipContinuing to decrease; coupling the secondary side of the inductor with the capacitor C3、C4Series pass diode VDoEnergy is transferred to the load side. When t is4Constantly flowing through diode VD3Current i ofVD3At 0, this mode ends.
5) Mode 5 (t)4-t5): the switch tube S is continuously turned off and the 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、C2Are connected in series to provide energy for a load side; inductor L1Continuing to discharge, inductor current iL1Decrease; coupling inductance primary side and secondary side winding and capacitor C4Series pass diode VDoTo the capacitor C2Charging, primary side 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
Then the voltage gain
In the formula VinFor input voltage, VoIn order to output the voltage, the voltage is,
d is the duty cycle of the switching tube.
(2) Zero input current characteristic
For the inductance LaThe voltage across it is:
when the capacitance C1And C2The value is big enough, and each electric capacity voltage ripple is neglected, then has:
Vin+vC1+vC2-vo≈Vin+VC1+VC2-Vo＝0
thus the inductance LaVoltage at both ends:
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 is also better achieved.
In order to verify the feasibility of the circuit, the circuit is simulatedTrue parameters: input voltage Vin＝36V,V0380V, inductance La＝30uH、L1＝350uH、Lm297uH, 1 for the coupling inductance turn ratio n, and C for the capacitance1＝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, the ripple wave is close to zero, and the simulation value of the output voltage is V0378.76V, the gain is 10.52, and the theoretical calculation value
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 ripple high-gain direct current converter based on a coupling inductor is characterized by comprising a direct current input power supply, a switch tube, the 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 switching tube, one end of a third 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 second capacitor and the first end of a primary winding of a coupling inductor, the other end of the second capacitor is connected with the cathode of a fifth diode, the other end of the fifth capacitor and the other end of the load, the cathode of the second diode is connected with the second end of the primary winding of the coupling inductor, the first end of a secondary winding of the coupling inductor, the drain electrode of the switching tube and the anode of the third diode, and the second end of the secondary winding of the coupling inductor is connected with the, The cathode of the fourth diode is connected, and the cathode of the third diode is connected with the anode of the fourth diode and the other end of the third capacitor.
2. The zero-input ripple high-gain direct current converter based on the coupled inductor according to claim 1, wherein the zero-input ripple high-gain direct current converter is formed by combining a coupled inductor ratio boost, a capacitor diode boost network and a capacitor clamp together to realize high voltage gain and zero input current ripple.
3. The zero-input ripple high-gain direct current converter based on the coupled inductor according to claim 1, wherein the zero-input ripple high-gain direct current converter utilizes clamping effects of the first capacitor and the second capacitor to enable a voltage across the second inductor to approach zero, so that a zero-input current ripple is realized.
4. The zero-input ripple high-gain DC converter based on the coupled inductor as claimed in claim 1, wherein the voltage gain of the zero-input ripple high-gain DC converter is as follows
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 ripple high-gain direct current converter based on the coupled inductor according to claim 1, wherein the zero-input ripple high-gain direct current 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 the fourthDiode VD4Cutting off; DC input power supply VinAnd a second inductor LaA first capacitor C1A second capacitor C2Are connected in series to provide energy for a load side; DC input power supply VinThrough a second diode VD2And a switching tube S for the first inductor L1Charging, inductor current iL1Linearly increasing; DC input power supply VinAnd a second inductor LaA first capacitor C1The leakage inductance L of the primary winding of the coupling inductor is connected in series through a switching tube SkCharging, coupling of inductor primary winding current ipLinear rapid increase, exciting current iLmDecrease; coupling the secondary winding of the inductor with a fourth capacitor C4Is connected in series through a switching tube S and a fifth diode VDoTransferring energy to the load side when t1At 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, the 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 VinThrough a second diode VD2And a switching tube S for the first inductor L1Charging is continued with inductor current iL1Linearly increasing; coupling inductor secondary winding and third capacitor C3Is connected in series through a switching tube S and a fourth diode VD4To a fourth capacitor C4Charging; fifth capacitor CoTo a second capacitance C2Discharging and supplying energy to load R when t2At the moment, the switching tube S is turned off, and the mode is ended;
(3) mode 3 (t)2-t3)：t2At the moment, the switch tube S is turned off and the first diode VD1A third diode VD3And a fourth diode VD4Conducting, the second diode VD2The fifth diode VDoCutting off; first inductance L1Through a first diode VD1To 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 ipBegin to decrease; the secondary winding of the coupling inductor passes through a third diode VD3And a fourth diode VD4Continue to supply the fourth capacitor C4Charging; fifth capacitor CoProviding energy to a load R when t3Time of day, 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 second capacitor C2Are connected in series to provide energy for a load side; first inductance L1Through a first diode VD1To the first capacitor C1Continuing discharging; coupled inductor primary winding excitation inductor LmEnergy is transferred to a load side through a secondary winding of a coupling inductor, and an exciting current iLmDecrease of primary side current ipContinuing to decrease; coupling the secondary winding of the inductor with a third capacitor C3A fourth capacitor C4Series connection fifth diode VDoTransferring energy to the load side when 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 continuously turned 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 second capacitor C2Are connected in series to provide energy for a load side; first inductance L1Continue discharging, inductanceCurrent iL1Decrease; coupling inductance primary winding, secondary winding and fourth capacitor C4Series connection fifth diode VDoTo a second capacitance C2Charging, primary side current ipWith excitation current iLmContinues to decrease when t5At that moment, when the switching tube S is turned on, this mode ends and the next switching cycle begins.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113014087A (en) * | 2021-03-12 | 2021-06-22 | 中国电子科技集团公司第十八研究所 | Coupling inductance type switch quasi-Z-source bidirectional direct current converter |
| CN114337303A (en) * | 2021-12-31 | 2022-04-12 | 华南农业大学 | Current self-balancing coupling inductance type high-gain bidirectional DC/DC converter |
| CN114977798A (en) * | 2022-07-29 | 2022-08-30 | 银河航天(西安)科技有限公司 | Wide voltage input cascade power supply circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113014087A (en) * | 2021-03-12 | 2021-06-22 | 中国电子科技集团公司第十八研究所 | Coupling inductance type switch quasi-Z-source bidirectional direct current converter |
| CN114337303A (en) * | 2021-12-31 | 2022-04-12 | 华南农业大学 | Current self-balancing coupling inductance type high-gain bidirectional DC/DC converter |
| CN114337303B (en) * | 2021-12-31 | 2023-11-28 | 华南农业大学 | Current self-balancing coupling inductance type high-gain bidirectional DC/DC converter |
| CN114977798A (en) * | 2022-07-29 | 2022-08-30 | 银河航天(西安)科技有限公司 | Wide voltage input cascade power supply circuit |
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| CN111371316B (en) | 2021-03-30 |
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