CN113162408A - Coupling inductance high-gain DC/DC converter based on novel Boost switch capacitor energy storage structure - Google Patents
Coupling inductance high-gain DC/DC converter based on novel Boost switch capacitor energy storage structure Download PDFInfo
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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
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Abstract
The invention discloses a coupling inductance high-gain DC/DC converter based on a novel Boost switch capacitor energy storage structure, which mainly comprises: the energy storage module comprises two switching tubes, five diodes, four capacitors and a coupling inductor, wherein the first switching tube is arranged between the first diode and the second diode, and two ends of the first switching capacitor are respectively connected with the drain electrode of the first switching tube and the cathode of the second diode connected with the source electrode of the switching tube to construct a novel Boost switching capacitor energy storage module; the primary side of the coupling inductor is respectively connected with the series structure of a third switch capacitor and a fourth diode in parallel, the switch capacitor module is connected with the second switch tube in parallel and connected with the secondary side of the coupling inductor, the series structure of the second switch capacitor and the third diode in parallel, and the output diode is positioned between the third switch capacitor and the load. The converter can improve the voltage gain of the switched capacitor converter under the control of low duty ratio, and simplify the structure of the converter.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a coupling inductor high-gain DC/DC converter based on a novel Boost switch capacitor energy storage structure.
Background
The switch capacitor converter can realize high voltage gain by utilizing the principle of parallel charging and serial discharging of the switch capacitors, and compared with the traditional switch power supply, the switch capacitor converter does not contain magnetic components, thereby greatly reducing the volume of the switch power supply, improving the power density and greatly lightening the EMI problem.
The traditional switched capacitor energy storage unit comprises a Boost type switched capacitor energy storage unit and a Buck-Boost type switched capacitor energy storage unit. The energy storage inductor is used for charging the switch capacitors in parallel, and then the switch capacitors are connected in series to discharge to the load, so that the Boost and Buck-Boost type converters can be improved by two times or more. Because of the existence of the energy storage unit, the switch capacitor is charged by the inductor, and the charging time of the inductor can be controlled to realize continuous and adjustable output voltage. However, if the boost ratio is to be increased, the duty ratio of the switching tube needs to be increased to make the inductor store more energy during the on period, but an excessively large duty ratio causes a high conduction loss of the switching tube and a problem of diode reverse recovery. When higher voltage gain is realized, more switched capacitor units still need to be superposed, and more switching tubes and diode devices are used.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention aims to provide a coupling Inductor and Coupled Inductor High Gain (SCCIHG) DC/DC converter based on a novel Boost Switched Capacitor energy storage structure, which can obtain a desired High Gain output voltage by operating a switching tube at a low duty ratio with fewer devices.
In order to achieve the above object, an embodiment of the present invention provides a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure, including: input power supply VgA first switch tube S1A second switch tube S2And an output diode D0First and secondPolar tube D1A second diode D2A third diode D3A fourth diode D4An output capacitor C0A first switch capacitor C1A second switch capacitor C2And a third switch capacitor C3A coupled inductor and a load R, wherein,
the first switch tube S1And the first diode D1The first switching tube S1And the second diode D2And connects the cathodes of the first switched capacitor C1Are respectively connected with the first switch tube S1And a first diode D connected to the source thereof1The anode of the capacitor is connected to construct a novel Boost switch capacitor energy storage module;
the input power supply VgAnd the first diode D of the novel Boost switch capacitor energy storage module1The primary winding of the coupling inductor is connected between the anodes, and the primary winding of the coupling inductor is respectively connected with the third switch capacitor C3And the output diode D0And the fourth diode D4The series connection structure of the first switch tube S and the second switch tube S are connected in parallel, and the novel Boost switch capacitor energy storage module2A secondary winding of the coupled inductor, and the second switched capacitor C2And the third diode D3Is connected in parallel, the output capacitor C0Connected in parallel with the load resistor R and respectively connected with the output diode D0And the third diode D3Of (2) an anode.
According to the coupling inductor high-gain DC/DC converter based on the novel Boost switch capacitor energy storage structure, the expected high-gain output voltage can be obtained by the low duty cycle operation of the switch tube under the condition that fewer devices are used, namely the structure of the converter is simplified while the voltage gain of the switch capacitor converter is improved; meanwhile, under the condition of the same voltage gain ratio, the voltage stress borne by the switching device is lower; the transformer has strong expandability, and the turn ratio of the transformer and the structure of the Boost energy storage unit can be adjusted to meet the conditions of different voltage gain ratios.
In addition, the coupling inductor high-gain DC/DC converter based on the novel Boost switched capacitor energy storage structure according to the above embodiment of the present invention may further have the following additional technical features:
further, in one embodiment of the present invention, the first switched capacitor C1The voltage of the energy storage inductor during energy storage is improved, and therefore the voltage of each switch capacitor is improved. In the novel Boost switch capacitor energy storage module, the first switch tube S1When the novel Boost switch capacitor energy storage module is conducted, all the novel Boost switch capacitor energy storage module bear reverse voltage, and the first switch capacitor C1And the input power supply VgIs connected in series to store energy for the coupled inductor, in the first switching tube S1When the switch-off is carried out, all the diodes are forward biased, and the first switch capacitor C1And the negative pole of the input power supply VgIn series, the coupled inductor transfers energy to the switched capacitor.
Further, in an embodiment of the present invention, when the first switch tube S is turned on, the second switch tube S is turned off1And the second switch tube S2When conducting, the input power supply VgIs connected in series with the first switch capacitor C1Charging the coupled inductor while the first switched capacitor C1The second switch capacitor C2The third switch capacitor C3The input power supply VgAnd a secondary winding of the coupled inductor in series to transfer energy to the load R; when the first switch tube S1And the second switch tube S2Energy stored in the coupled inductor when turned off is applied to the first switched capacitor C1The second switch capacitor C2The third switch capacitor C3Charging is performed in parallel.
Further, in one embodiment of the present invention, the coupled inductor includes a turns ratio of Np：NsIdeal transformer, excitation inductance LmAnd leakage inductance Llk。
Further, in one embodiment of the present inventionIn an embodiment, the high-gain DC/DC converter is divided into a continuous Current Mode CCM (continuous Current Mode) and a Discontinuous Current Mode DCM (Discontinuous Current Mode, DCM) according to whether the secondary winding Current of the coupling inductor is continuous, wherein, in a preset stable period, when the secondary winding Current of the coupling inductor is continuous all the time, the high-gain DC/DC converter operates in the continuous Current Mode CCM; when the secondary winding current of the coupled inductor is in the first switch tube S1And the second switch tube S2The conducting period is continuous, and when the switching-off period is intermittent, the high-gain DC/DC converter operates in a first current intermittent mode DCM-I; when the secondary winding current of the coupled inductor is in the first switch tube S1And the second switch tube S2And the conduction period is intermittent, and when the turn-off period is continuous, the high-gain DC/DC converter operates in a second current intermittent mode DCM-II.
Further, in an embodiment of the present invention, five operating modes exist in the current continuous mode CCM, specifically:
a first mode of operation: at t0-t1At the moment, the first switch tube S1And the second switch tube S2On, the first diode D1The second diode D2And the fourth diode D4Is cut off by bearing reverse voltage drop, and the secondary winding current i of the coupled inductorNsThrough the second scattering diode D3Free wheeling, the voltage thereon being controlled by said second switched capacitor C2Clamping, wherein the voltage of the primary winding of the coupled inductor is also kept to be negative left and positive right, and the exciting current iLmContinuing to linearly decrease; the first switch capacitor C1Is connected in series with the input power supply VgAnd an excitation inductance LmGive a leakage inductance LlkEnergy storage, leakage inductance current iLkRises rapidly, at which time the leakage current iLkIs less than the exciting current iLmPrimary winding current i of the coupled inductorNpStill flows out from the same name end when the exciting current iLmAnd the leakage inductance current iLkIs equal toWhen so, the modality ends;
the second working mode is as follows: at t1-t2，t2-t3Time of day, the third diode D3Off, the output diode D0Conduction, secondary winding current i of the coupled inductorNsIn the reverse direction, the first switching tube S1And the second switch tube S2During the on-off period, the output capacitor continuously supplies power to the load, the voltage value of the output capacitor is lower, the voltage of the secondary winding of the coupled inductor is lower, and the leakage inductance L is lowerlkHigher voltage, said leakage inductance current iLlkRising; the input power supply VgIs connected in series with the first switch capacitor C1For said excitation inductance LmAnd the leakage inductance LlkEnergy storage, the exciting current iLmLinearly increasing; secondary winding N of the coupled inductorsInducing a positive-negative voltage in series with the input power supply VgAnd the first switched capacitor C1The second switch capacitor C2The third switch capacitor C3Through the output diode D0To the output capacitor CoAnd a load R; secondary winding current i of the coupled inductorNsFlows out from the same name end and is refracted to the primary winding through magnetic induction coupling, and the primary winding current i of the coupling inductorNpThe leakage inductance current flows from the same name end and is the excitation inductance current iLmAnd the primary side current iNpSum of the above-mentioned two inductors i is greater than the excitation inductance iLmCurrent flow;
the third working mode is as follows: at t3-t4At the moment, the first switch tube S1And the second switch tube S2Off, the first diode D1And the second diode D2Conducting in the forward direction; secondary winding current i of the coupled inductorNsThrough the first diode D1And the second diode D2Follow current, said output diode D0Is still conducted, the secondary winding voltage of the coupled inductor is controlled by the output capacitor C0A clamp coupled to a primary winding of the coupled inductor, theExcitation current iLmThe linear rising is continued and the slope is increased, and the leakage inductance LlkSubject to reverse voltage, said leakage-induced current iLkLinearly decreases, at which time the leakage inductance current iLkIs greater than the exciting current iLmCurrent of said primary side current iNpStill flows from the same name end until the leakage inductance current iLkAnd the excitation current iLmEquality, ending the modality;
the fourth working mode: at t4-t5At the moment, the output diode D0Off, the third diode D3Forward conduction, secondary winding current i of the coupled inductorNsIn the reverse direction, the secondary winding of the coupled inductor induces a voltage with a positive lower voltage and a negative upper voltage, the voltage of the secondary winding of the coupled inductor is smaller than that in a steady state, and the leakage inductance LlkThe upper voltage is larger, and the leakage inductance current iLkRapidly falls until the fourth diode D4Conducting and ending the mode;
a fifth working mode: at t5-t6Time of day, the fourth diode D4On, the excitation inductance LmAnd the leakage inductance LlkBy said supply of said third switched capacitor C3Charging; is connected in series with the input power supply VgThrough the first diode D1And the second diode D2To the first switched capacitor C1Charging; is then connected in series with the input power supply VgAnd a secondary winding N of the coupled inductorsThrough the second diode D2The third diode D3To the second switched capacitor C2Charging; secondary winding N of the coupled inductorsVoltage is controlled by the first switched capacitor C1The second switch capacitor C2Clamping of said excitation current iLmLinearly decreasing, the primary side current iNpThe leakage inductance current i flows out from the same name endLkLess than the exciting inductance current iLm。
Further, in an embodiment of the present invention, five operation modes of the first current discontinuous mode DCM-I existThe method specifically comprises the following steps: a first mode of operation: at t0-t2The moment is the same as the second working mode of the current continuous mode CCM; the second working mode is as follows: at t2-t3The time is the same as the third working mode of the current continuous mode CCM; the third working mode is as follows: at t3-t4The time is the same as the fourth working mode of the current continuous mode CCM; the fourth working mode: at t4-t5The moment is the same as the fifth working mode of the current continuous mode CCM; a fifth working mode: at t5-t6At the moment when the leakage-induced current iLkDown to and with the excitation current iLmWhen the currents are equal, the secondary winding current i of the coupled inductorNsDrops to zero, the third diode D3Realize ZCS off, at this moment, the first switch tube S1And the second switch tube S2Non-conducting, secondary winding current i of said coupled inductorNsThe reverse direction is impossible, and the coupling part of the coupling inductor does not participate in the work; the excitation part and the leakage inductance of the coupling inductor charge the switch capacitor; is then connected in series with the input power supply VgThrough the first diode D1The second diode D2To the first switched capacitor C1And (6) charging.
Further, in an embodiment of the present invention, five operation modes of the second current discontinuous mode DCM-II exist, specifically: a first mode of operation: at t0-t1The moment is the same as the first working mode of the current continuous mode CCM; the second working mode is as follows: at t1-t3The moment is the same as the second working mode of the current continuous mode CCM; the third working mode is as follows: at t3-t4At the moment when the leakage-induced current iLkDown to and with the excitation current iLmWhen the currents are equal, the secondary winding current i of the coupled inductorNsDrops to zero, the output diode D0Realize ZCS off, at this moment, the first switch capacitor C1Is connected in series with the input power supply VgExcitation supply inductance LmLlkAnd leakage inductance energy storageExcitation inductance current iLmAnd leakage inductance current iLkEqual and linearly increasing; the fourth working mode: at t4-t5At time t3-t4The time is the same as the fourth working mode of the current continuous mode CCM; a fifth working mode: at t5～t6The time is the same as the fifth working mode of the current continuous mode CCM.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a topology structure diagram of a coupling inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure according to an embodiment of the present invention;
FIG. 2 is a topology of a novel switched capacitor energy storage module of one embodiment of the present invention;
fig. 3 is a schematic diagram of an on state and an off state of a switching tube of a DC/DC converter based on a multiple-Boost switched capacitor energy storage unit according to an embodiment of the present invention, where (a) is the on state of the switching tube, and (b) is the off state of the switching tube;
fig. 4 is a main waveform change diagram of a coupling inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a current continuous mode CCM according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a state 6 current loop of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a continuous current mode CCM according to an embodiment of the present invention, where (a) is t0-t1A current flow diagram at time, wherein (b) is t2-t3A current flow diagram at time, wherein (c) is t3-t4A current flow diagram at time, and (d) is t4-t5A current flow diagram at time (e) is t5-t6A current flow diagram of a time;
fig. 6 is a main waveform change diagram of a coupling inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a first current discontinuous mode DCM-I according to an embodiment of the present invention;
fig. 7 is a schematic view of a mode 5 current loop of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a first current discontinuous mode DCM-I according to an embodiment of the present invention;
fig. 8 is a main waveform change diagram of a coupling inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a second current discontinuous mode DCM-II according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a mode 3 current loop of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a second current discontinuous mode DCM-II according to an embodiment of the present invention;
fig. 10 is a waveform change diagram of an open-loop input/output voltage and current experiment of a coupling inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure according to an embodiment of the present invention;
fig. 11 is a waveform change diagram of a primary and secondary voltage-current experiment of a coupling inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a current continuous mode CCM, where (a) is a waveform change diagram of primary and secondary currents of the coupling inductor, and (b) is a waveform change diagram of primary and secondary voltages of the coupling inductor;
fig. 12 is a waveform change diagram of a main voltage current experiment of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a current continuous mode CCM, wherein (a) is a waveform change diagram of primary and secondary side currents of a coupled inductor, and (b) is a waveform change diagram of primary and secondary side voltages of the coupled inductor;
FIG. 13 is a waveform diagram of a diode voltage experiment of a coupled inductor high-gain DC/DC converter based on a novel Boost switch capacitor energy storage structure in a current continuous mode CCM, wherein (a) is a driving signal and D1、D2、D3Voltage waveform change diagram, (b) is driving signal and D4、DoVoltage experiment waveform change chart;
FIG. 14 is a waveform variation diagram of a main experiment of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a first current discontinuous mode DCM-I, wherein (a) is a waveform variation diagram of primary and secondary side currents of a coupled inductor, and (b) is D3Voltage current and amplified waveform variation diagram;
FIG. 15 is a waveform variation diagram of a main experiment of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a second current discontinuous mode DCM-II, in which (a) is a waveform variation diagram of primary and secondary side currents of a coupled inductor, and (b) is DoVoltage current and amplified waveform change diagram.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a topology structure diagram of a coupling inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure according to an embodiment of the present invention.
As shown in fig. 1, the apparatus 10 includes: input power supply VgA first switch tube S1A second switch tube S2And an output diode D0A first diode D1A second diode D2A third diode D3A fourth diode D4An output capacitor C0A first switch capacitor C1A second switch capacitor C2And a third switch capacitor C3A coupled inductor and a load R.
Wherein, the first switch tube S1Source electrode of and first diode D1Cathode connection ofA first switch tube S1And a second diode D2Is connected to the cathode of the first switch capacitor C1Are respectively connected with the first switch tube S1And a first diode D connected to the source thereof1The anode of the capacitor is connected to construct a novel Boost switch capacitor energy storage module.
First switch capacitor C1The voltage of the energy storage inductor during energy storage is improved, and therefore the voltage of each switch capacitor is improved. In the novel Boost switch capacitor energy storage module, when a first switch tube S1When the novel Boost switch capacitor energy storage module is conducted, all diodes in the novel Boost switch capacitor energy storage module bear reverse voltage, and the first switch capacitor C1Positive pole and input power supply VgThe negative ends of the two inductors are connected in series to store energy for the coupling inductor; when the first switch tube S1When the switch is turned off, all the diodes are forward biased, and the first switch capacitor C1Negative pole and input power supply VgAre connected in series, and the coupled inductor transfers energy to the switched capacitor.
Specifically, as shown in fig. 2, the charging voltage of the inductor is increased in the inductor energy storage stage of the novel Boost switched capacitor energy storage module provided by the invention, so that the energy provided for the switched capacitor is increased in the discharging stage, and the Boost ratio is greatly improved finally. During the conduction period of the switch tube, the input power supply VgThe voltage of the capacitor is connected with the switch capacitor in series to provide charging voltage for the inductor; during the turn-off period of the switch tube, the switch capacitors are connected in parallel and input with a power supply VgThe capacitor is connected with the inductor in series to charge each capacitor.
Further, as shown in fig. 3, taking the simplest switched capacitor converter structure of the novel Boost energy storage module as an example, it can be seen through simplified analysis that the Boost ratio can be greatly improved. Without considering the transient process, the operation mode can be simplified into two main modes of switching tube on and switching tube off.
In order to meet the requirement of high Boost during photovoltaic power generation, the invention combines a coupling inductor on the basis of providing a multiple Boost switch capacitor energy storage unit, wherein the coupling inductor comprises a turn ratio Np：NsIdeal transformer, excitation inductance LmAnd leakage inductance LlkA novel coupling inductance switch capacitor high-Boost DC/DC converter based on a multiple Boost energy storage structure is provided.
Specifically, the specific connection relationship of the high-gain DC/DC converter proposed by the present invention is: input power supply VgThe anode of the capacitor energy storage module and the first diode D of the novel Boost switch capacitor energy storage module1The primary winding of the coupling inductor is connected between the anodes, and the primary winding of the coupling inductor is respectively connected with the third switch capacitor C3And an output diode D0And a fourth diode D4The series connection structure of the capacitor energy storage module and the second switching tube S are connected in parallel, and the novel Boost switch capacitor energy storage module2Secondary winding of coupled inductor, second switch capacitor C2And a third diode D3Is connected in parallel, and an output capacitor C0Connected in parallel with the load R and respectively connected with an output diode D0And a third diode D3Of (2) an anode.
In the high-gain DC/DC converter provided by the invention, when the input voltage is 25-40V, the switching tubes S1 and S2 are simultaneously turned on and off. When the first switch tube S1And a second switching tube S2When conducting, the input power VgA first switch capacitor C connected in series1Charging the coupled inductor while the first switched capacitor C1A second switch capacitor C2And a third switch capacitor C3Input power supply VgThe secondary winding of the coupling inductor is connected in series to transfer energy to a load R, so that the output voltage is greatly improved; when the first switch tube S1And a second switching tube S2When the inductor is turned off, the energy stored in the coupled inductor is applied to the first switch capacitor C1A second switch capacitor C2And a third switch capacitor C3The parallel connection is used for charging, and the voltage on each switch capacitor is greatly improved.
Furthermore, the high-gain DC/DC converter provided by the invention can be divided into a current continuous mode CCM and a current discontinuous mode DCM according to whether the secondary side current of the coupling inductor is continuous or not. During a stable period, when the secondary winding current of the coupled inductor is continuous all the time, the high-gain DC/DC converter operates in a current continuous modeCCM; when the secondary winding current of the coupled inductor flows in the first switch tube S1And a second switching tube S2The on period is continuous, and when the off period is intermittent, the high-gain DC/DC converter operates in a first current intermittent mode DCM-I; when the secondary winding current of the coupled inductor flows in the first switch tube S1And a second switching tube S2And the conduction period is intermittent, and when the turn-off period is continuous, the high-gain DC/DC converter operates in a second current intermittent mode DCM-II. Wherein the first current discontinuous mode DCM-I can realize the third diode D3Zero current turn-off, second current discontinuous mode DCM-II can realize output diode D0Zero current is turned off.
To simplify the circuit analysis, the present invention can make the following assumptions:
(1) all switching devices are ideal, ignoring their parasitic diodes and capacitances;
(2) all power devices are ideal, ignoring on-resistance and forward on-voltage;
(3) turns ratio of coupled inductor 1: n issIs defined as Np：NsThe coupling coefficient k is equal to Lm/(Lm+Lk)。
As shown in fig. 4, a main waveform containing transient of a novel high-gain DC/DC converter based on a Boost switched capacitor energy storage unit and a coupling inductor is provided in a current continuous mode CCM. Wherein v isgsIs a switch S1And S2Drive signal of iLkIs the leakage current waveform of the primary winding of the coupled inductor iNsIs the secondary winding current waveform of the coupled inductor iLmIs the primary winding exciting inductance current waveform of the coupled inductor, vS1、vS1Are respectively a first switch tube S1A second switch tube S2V waveform of the drain-source voltage ofD1、vD2、vD3、vD4Are respectively a first diode D1A second diode D2A third diode D3A fourth diode D4The reverse voltage waveform of (a). In a switching period, six switching modes can be divided, and each modeThe equivalent circuit of (2) is shown in fig. 5.
Specifically, as shown in fig. 5(a), the first operation mode: at [ t ]0，t1]At the moment, the first switch tube S1And a second switching tube S2Conducting the first diode D1A second diode D2And a fourth diode D4Subject to a reverse pressure drop and shut off. Secondary winding current i of coupled inductorNsThrough a second scattering diode D3Free wheeling on which voltage is switched by a second switched capacitor C2Clamping, the voltage of the primary winding of the coupled inductor is also kept to be left negative and right positive, and the exciting current iLmContinuing to linearly decrease; first switch capacitor C1Series input power supply VgAnd an excitation inductance LmGive a leakage inductance LlkStoring energy, therefore, leakage inductance LlkBears a large left positive and right negative voltage, and the leakage inductance current i thereofLkRises rapidly, at which time the excitation current iLmLess than leakage inductance current iLkPrimary winding current i of coupled inductorNpStill flows out from the same name end when the exciting current iLmAnd leakage inductance current iLkWhen equal, the modality ends.
As shown in fig. 5(b), the second operation mode: at [ t ]1，t2]，[t2，t3]Time of day, the third diode D3Cut-off, output diode D0Conducting, coupling secondary winding current i of inductorNsAnd reversing. Due to the first switch tube S1And a second switching tube S2During the on-off period, the output capacitor continuously supplies power to the load, the voltage value on the output capacitor is lower, the voltage on the secondary winding of the coupling inductor is lower, and the leakage inductance L is reducedlkHigher voltage, leakage current iLlkRises for a short period of time, thereafter iLlkThe rising speed becomes slow. Input power supply VgA first switch capacitor C connected in series1Excitation supply inductance LmAnd leakage inductance LlkEnergy storage, exciting current iLmLinearly increasing; while coupling the secondary winding N of the inductorsInducing a positive voltage and a negative voltage, and connecting the two voltages in series with an input power supply VgAnd a first switched capacitor C1A second switch capacitor C2And a third switch capacitor C3Through an output diode D0To the output capacitor CoAnd a load R; secondary winding current i of coupled inductorNsFlows out from the same name end, is refracted to the primary winding by magnetic induction coupling, and couples the primary winding current i of the inductorNpThe leakage inductance current flows from the same name end and is the excitation inductance current iLmAnd the primary side current iNpSo that it is greater than the exciting inductance i in the time periodLmThe current is applied.
As shown in fig. 5(c), the third mode of operation: at [ t ]3，t4]At the moment, the first switch tube S1And a second switching tube S2Off, the first diode D1And a second diode D2Conducting in the forward direction; secondary winding current i of coupled inductorNsThrough a first diode D1And a second diode D2Freewheeling, output diode D0The voltage of the secondary winding of the coupled inductor is output by the output capacitor C0Clamp, primary winding coupled to coupled inductor, exciting current iLmContinuously linearly rising, increasing slope, and leakage inductance LlkBearing reverse voltage, leakage current iLkLinearly decreases, whereby the current i flowing through the secondary windingNsAnd rapidly decreases. At this time, the leakage current iLkGreater than the exciting current iLmCurrent, so primary side current iNpStill flows from the same name end until the leakage inductance current iLkWith excitation current iLmEqual, the modality ends.
As shown in fig. 5(d), the fourth mode of operation: at [ t ]4，t5]Time of day, output diode D0Off, third diode D3Forward conduction, coupled secondary winding current i of inductorNsAnd reversing. The secondary winding of the coupled inductor induces a voltage with positive and negative lower values, and the first switched capacitor C is in the second working mode1Charging, second switched capacitor C2Discharging, the voltage of the secondary winding of the coupled inductor is smaller than that in steady state, and leakage inductance LlkLarge upper voltage and leakage current iLkRapidly falls until the fourth diode D4Conducting at this timeThe state existence time is short.
As shown in fig. 5(e), the fifth operation mode: at [ t ]5，t6]Time of day, the fourth diode D4Conducting and exciting inductor LmAnd leakage inductance LlkBy providing a third switch with a capacitor C3Charging; series input power supply VgThrough a first diode D1And a second diode D2For the first switched capacitor C1Charging; re-series input power supply VgAnd secondary winding N of coupled inductorsThrough a second diode D2A third diode D3To the second switched capacitor C2And (6) charging. Secondary winding N of coupled inductorsThe voltage is controlled by the first switched capacitor C1A second switch capacitor C2Clamping, exciting current iLmLinearly decreasing, primary side current iNpLeakage current i flowing from the same name terminalLkLess than exciting inductance current iLm。
Furthermore, when the inductance value of the novel high-gain DC/DC converter based on the Boost switch capacitor energy storage unit and the coupling inductor provided by the invention is reduced, the novel high-gain DC/DC converter can operate in a first current discontinuous mode DCM-I, the current of the secondary winding of the coupling inductor is continuous when the switch is switched on and discontinuous when the switch is switched off, and the third diode D is enabled to be continuous when the switch is switched off3ZCS shutdown is achieved.
As shown in fig. 6, the first current discontinuous mode DCM-I has five operation modes, specifically:
a first mode of operation: at [ t ]0，t2]The time is the same as the second working mode of the current continuous mode CCM;
the second working mode is as follows: at [ t ]2，t3]The time is the same as the third working mode of the current continuous mode CCM;
the third working mode is as follows: at [ t ]3，t4]The time is the same as the fourth working mode of the current continuous mode CCM;
the fourth working mode: at [ t ]4，t5]The moment is the same as the fifth working mode of the current continuous mode CCM;
a fifth working mode:as shown in fig. 7, at t5，t6]At the moment when the leakage-induced current iLkDown to and with the excitation current iLmWhen equal, the secondary winding current i of the coupled inductorNsDrop to zero, third diode D3Realize ZCS turn-off, at this moment, the first switch tube S1And a second switching tube S2Non-conducting, secondary winding current i of coupled inductorNsThe reverse direction is not available, and the coupling part of the coupling inductor does not participate in the work; the exciting part and the leakage inductance of the coupling inductor charge the switch capacitor; re-series input power supply VgIs passed through a first diode D1A second diode D2For the first switched capacitor C1And (6) charging. In this mode, the excitation current iLmEqual to leakage inductance current iLkAnd linearly decreasing, secondary winding iNsThe current is always zero.
Furthermore, when the novel high-gain DC/DC converter based on the Boost switch capacitor energy storage unit and the coupling inductor provided by the invention is lighter in load, the novel high-gain DC/DC converter can operate in a second current discontinuous mode DCM-II, and the secondary side current of the coupling inductor is continuous when the switch is turned off and discontinuous when the switch is turned on, so that the output diode D can be output0ZCS shutdown is achieved.
As shown in fig. 8, the second current discontinuous mode DCM-II has five operation modes, specifically:
a first mode of operation: at [ t ]0，t1]The time is the same as the first working mode of the current continuous mode CCM;
the second working mode is as follows: at [ t ]1，t3]The time is the same as the second working mode of the current continuous mode CCM;
the third working mode is as follows: as shown in fig. 9, at t3，t4]At the moment when the leakage-induced current iLkDown to and with the excitation current iLmWhen equal, the secondary winding current i of the coupled inductorNsDrops to zero and outputs a diode D0Realize ZCS turn-off, at this moment, the first switch capacitor C1Series input power supply VgExcitation supply inductance LmLlkAnd leakage inductance energy storage, excitation inductance current iLmAnd leakage inductance current iLkEqual and linearly increasing;
the fourth working mode: at [ t ]4，t5]At time t3～t4The time is the same as the fourth working mode of the current continuous mode CCM;
a fifth working mode: at [ t ]5，t6]At the same time, the fifth operation mode of the current continuous mode CCM is performed.
In an ideal case, in order to simplify the derivation of the voltage gain, the effects of coupling inductance leakage inductance, parasitic capacitance and transient are ignored. In the first switch tube S1A second switch tube S2The voltage of the magnetizing inductance Lm in the on and off states can be expressed by the formula (1) and the formula (2):
in the formula (I), the compound is shown in the specification,
the primary side of the excitation winding bears voltage V when the switching tube is switched on and offgIs a voltage of the power supply and is,
is the voltage on the first switched capacitor.
Excitation inductance LmThe volt-second equilibrium theorem is satisfied in a stable period, as shown in equation (3):
simultaneous equations (1) to (3), the first switched capacitor C1The voltage across can be expressed as:
where D is the duty cycle and T is one cycle time.
During the off period of the switch, the primary winding NpAnd secondary winding NsSeries input voltage source VgIs C2Energy is supplied, and the primary and secondary winding voltages can be obtained:
in the formula (I), the compound is shown in the specification,
the primary side and the secondary side of the excitation winding bear voltage when the switching tube is turned off,
is the voltage on the second switched capacitor.
Similarly, a third switched capacitor C3The voltage on can be expressed as:
in the formula (I), the compound is shown in the specification,
is the voltage on the third switched capacitor.
During the switch-on period, the secondary side inductor of the coupling winding is connected in seriesSource VgAnd a first switched capacitor C1A second switch capacitor C2And a third switch capacitor C3And supplying power to the load R, the output voltage can be obtained as follows:
in the formula, VoOutputting a voltage for the converter.
Substituting the formula (4), the formula (7) and the formula (8) into the formula (9) to obtain the output voltage gain M of
In the formula, M is the voltage gain, and n is the transformer turn ratio.
A prototype is built below to verify that the coupling inductor and the switched capacitor high-gain DC/DC converter based on the multiple Boost energy storage structure is provided by the invention for verification.
Firstly, prototype indexes are as follows:
(1) input voltage: 25-40 Vdc;
(2) output voltage: 400 Vdc;
(3) output power: rated power is 200W;
(4) the working frequency is as follows: 100 KHz;
(5) efficiency: not less than 90%;
next, the current continuous mode CCM was verified:
as shown in fig. 10, it can be seen that the output voltage reaches 380V, the voltage gain is 15.2 and the output current is about 0.523A when the input voltage is 25V for the experimental waveforms of the output voltage, the current and the driving signal. When the duty ratio is 0.35, the output power is 200W, and the output voltage ripple is small, thereby meeting the requirement of design index.
As shown in FIG. 11, a first switch tube S is shown1A second switch tube S2Experimental waveforms of the driving signal and the primary and secondary current voltages of the coupled inductor. When the first switch tube S1A second switch tube S2When conducting, the input power VgA first switch capacitor C connected in series1Charging the coupled inductor with the voltage at the same name as positive and the voltage at the primary and secondary sides as input power VgAnd a first switched capacitor C1The sum of the voltages, the primary winding current rises linearly. Meanwhile, a secondary winding of the coupled inductor is connected in series with an input power supply VgA first switch capacitor C1A second switch capacitor C2And a third switch capacitor C3To output capacitance C0And a load R. First switch tube S1A second switch tube S2When turned off, the primary current of the coupled inductor reaches a maximum value. When the first switch tube S1A second switch tube S2After the switch-off, the primary and secondary side voltage of the coupled inductor is the first switch capacitor C1Voltage and input power supply voltage VgAnd the difference, namely the voltage at the same name terminal is negative, and all the switched capacitors are charged.
As shown in FIG. 12, the driving signal and the drain-source voltage of the switch tube and the first switch capacitor C are respectively given1A second switch capacitor C2And a third switch capacitor C3Voltage waveform of (2). When the first switch tube S1A second switch tube S2When conducting, the first switch capacitor C1A second switch capacitor C2And a third switch capacitor C3The series connection provides energy to the load R and the voltage drops. When the first switch tube S1A second switch tube S2When the switch is turned off, the first switch tube S1And a second switching tube S2The voltage stress of the coupling inductor is about 80V and far lower than the output voltage, and the primary side and the secondary side of the coupling inductor are provided with a first switch capacitor C1A second switch capacitor C2And a third switch capacitor C3Storing energy, the voltage of the energy storage device rises, and the ripple wave meets the design index.
As shown in fig. 13, are the first diodes D respectively1A second diode D2A third diode D3A fourth diode D4And an output diode D0Voltage test waveform of (2). With a nominal duty cycle of 0.35, the first diode D1And a second diode D2Electricity (D) fromA compressive stress of 76V, much lower than the output voltage, and a third diode D3A fourth diode D4And an output diode D0The voltage stresses of 154V, 224V and 300V are consistent with theoretical calculations in the steady state analysis.
Next, the first current discontinuous mode DCM-I is verified:
when the coupling inductor and the switch capacitor high-gain DC/DC converter based on the multiple Boost energy storage structure operate in DCM-I, the secondary side current of the coupling inductor is continuous when the switch is switched on and is discontinuous when the switch is switched off, so that the third diode D is enabled3ZCS shutdown is achieved. As shown in FIG. 14, the experimental waveform of primary and secondary side currents of the coupling inductor based on the multiple Boost energy storage structure and the coupling inductor of the switched capacitor high-gain DC/DC converter and the diode D under DCM-I are shown3Voltage current experimental waveform. As can be seen from fig. 14(a), when the switch is turned off, the coupling inductor finishes charging the switched capacitor, and the secondary winding current decreases to zero until the switch is turned on again. From FIG. 14(b), the third diode D3The current naturally drops to zero turn-off, and zero current turn-off is realized.
Next, the first current discontinuous mode DCM-II is verified:
when the coupling inductor and the switch capacitor high-gain DC/DC converter based on the multiple Boost energy storage structure operate in DCM-II, the secondary side current of the coupling inductor is continuous when the switch is turned off and is discontinuous when the switch is turned on, so that the output diode D can be output0ZCS shutdown is achieved. As shown in FIG. 15, the experimental waveforms of the primary and secondary side currents of the coupling inductor based on the multiple Boost energy storage structure and the coupling inductor of the switched capacitor high-gain DC/DC converter and the output diode D under DCM-II are shownoVoltage current experimental waveform. As can be seen from fig. 13(a), when the switch is turned on, the secondary winding of the coupled inductor is connected in series with the input power VgA first switch capacitor C1A second switch capacitor C2And a third switch capacitor C3To output capacitance CoAnd the load R supplies power, and because the load R is lighter, the secondary side current is reduced to zero during the on-state of the switch until the switch is turned back after being turned off. As can be seen from FIG. 15(b), the first embodiment isOutput diode D during off conduction0The current is turned off after naturally dropping to zero, and zero current turning off is realized.
In summary, the coupling inductor high-gain DC/DC converter based on the novel Boost switched capacitor energy storage structure provided by the embodiment of the invention can obtain the expected high-gain output voltage by the low duty cycle operation of the switching tube under the condition of using fewer devices, that is, the structure of the converter is simplified while the voltage gain of the switched capacitor converter is improved; meanwhile, under the condition of the same voltage gain ratio, the voltage stress borne by the switching device is lower; the transformer has strong expandability, and the turn ratio of the transformer and the structure of the Boost energy storage unit can be adjusted to meet the conditions of different voltage gain ratios.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. The utility model provides a high gain DC/DC converter of coupling inductance based on novel Boost switched capacitor energy storage structure which characterized in that includes: input power supply VgA first switch tube S1A second switch tube S2And an output diode D0A first diode D1A second diode D2A third diode D3A fourth diode D4An output capacitor C0A first switch capacitor C1A second switch capacitor C2And a third switch capacitor C3A coupled inductor and a load R, wherein,
the first switch tube S1And the first diode D1The first switching tube S1And the second diode D2And connects the cathodes of the first switched capacitor C1Are respectively connected with the first switch tube S1And a first diode D connected to the source thereof1The anode of the capacitor is connected to construct a novel Boost switch capacitor energy storage module;
the input power supply VgAnd the first diode D of the novel Boost switch capacitor energy storage module1The primary winding of the coupling inductor is connected between the anodes, and the primary winding of the coupling inductor is respectively connected with the third switch capacitor C3And the output diode D0And the fourth diode D4The series connection structure of the first switch tube S and the second switch tube S are connected in parallel, and the novel Boost switch capacitor energy storage module2A secondary winding of the coupled inductor, and the second switched capacitor C2And the third diode D3Is connected in parallel, the output capacitor C0Connected in parallel with the load R and respectively connected with the output diode D0And the third diode D3Of (2) an anode.
2. The novel Boost switched capacitor energy storage structure-based coupled inductor high-gain DC/DC converter as claimed in claim 1, wherein in the novel Boost switched capacitor energy storage module, in the first switch tube S1When the novel Boost switch capacitor energy storage module is conducted, all diodes in the novel Boost switch capacitor energy storage module bear reverse voltage, and the first switch capacitor C1And the input power supply VgIs connected in series to store energy for the coupled inductor, in the first switching tube S1When the switch-off is carried out, all the diodes are forward biased, and the first switch capacitor C1And the negative pole of the input power supply VgIn series, the coupled inductor transfers energy to the switched capacitor.
3. The multiple-Boost energy storage structure-based coupling inductor and switched capacitor high-gain DC/DC converter according to claim 1,
when the first switch tube S1And the second switch tube S2When conducting, the input power supply VgIs connected in series with the first switch capacitor C1Charging the coupled inductor while the first switched capacitor C1The second switch capacitor C2The third switch capacitor C3The input power supply VgAnd a secondary winding of the coupled inductor in series to transfer energy to the load R;
when the first switch tube S1And the second switch tube S2Energy stored in the coupled inductor when turned off is applied to the first switched capacitor C1The second switch capacitor C2The third switch capacitor C3Charging is performed in parallel.
4. The coupled inductor high-gain DC/DC converter based on the novel Boost switched capacitor energy storage structure as claimed in claim 1, wherein the coupled inductor comprises a turn ratio Np：NsIdeal transformer, excitation inductance LmAnd leakage inductance Llk。
5. The novel Boost switched capacitor energy storage structure-based coupled inductor high-gain DC/DC converter according to claim 1, wherein the high-gain DC/DC converter is divided into a Continuous Current Mode (CCM) and a Discontinuous Current Mode (DCM) according to whether the secondary winding current of the coupled inductor is continuous or not, wherein, in a preset stable period,
when the secondary winding current of the coupled inductor is continuous all the time, the high-gain DC/DC converter operates in the current continuous mode CCM;
when the secondary winding current of the coupled inductor is in the first switch tube S1And the second switch tube S2The conducting period is continuous, and when the switching-off period is intermittent, the high-gain DC/DC converter operates in a first current intermittent mode DCM-I;
when the secondary winding current of the coupled inductor is in the first switch tube S1And the second switch tube S2And the conduction period is intermittent, and when the turn-off period is continuous, the high-gain DC/DC converter operates in a second current intermittent mode DCM-II.
6. The novel Boost switched capacitor energy storage structure-based coupled inductor high-gain DC/DC converter according to claim 3, wherein five operating modes exist in the current continuous mode CCM, specifically:
a first mode of operation: at t0-t1At the moment, the first switch tube S1And the second switch tube S2On, the first diode D1The second diode D2And the fourth diode D4Is cut off by bearing the reverse pressure drop,
secondary winding current i of the coupled inductorNsThrough the second scattering diode D3Free wheeling, the voltage thereon being controlled by said second switched capacitor C2Clamping, wherein the voltage of the primary winding of the coupled inductor is also kept to be negative left and positive right, and the exciting current iLmContinuing to linearly decrease; the first mentionedA switched capacitor C1Is connected in series with the input power supply VgAnd an excitation inductance LmGive a leakage inductance LlkEnergy storage, leakage inductance current iLkRises rapidly, at which time the leakage current iLkIs less than the exciting current iLmPrimary winding current i of the coupled inductorNpStill flows out from the same name end when the exciting current iLmAnd the leakage inductance current iLkWhen they are equal, the mode ends;
the second working mode is as follows: at t1-t2，t2-t3Time of day, the third diode D3Off, the output diode D0Conduction, secondary winding current i of the coupled inductorNsIn the reverse direction, the first switching tube S1And the second switch tube S2During the on-off period, the output capacitor continuously supplies power to the load, the voltage value of the output capacitor is lower, the voltage of the secondary winding of the coupled inductor is lower, and the leakage inductance L is lowerlkHigher voltage, said leakage inductance current iLlkRising;
the input power supply VgIs connected in series with the first switch capacitor C1For said excitation inductance LmAnd the leakage inductance LlkEnergy storage, the exciting current iLmLinearly increasing; secondary winding N of the coupled inductorsInducing a positive-negative voltage in series with the input power supply VgAnd the first switched capacitor C1The second switch capacitor C2The third switch capacitor C3Through the output diode D0To the output capacitor CoAnd a load R;
secondary winding current i of the coupled inductorNsFlows out from the same name end and is refracted to the primary winding through magnetic induction coupling, and the primary winding current i of the coupling inductorNpThe leakage inductance current flows from the same name end and is the excitation inductance current iLmAnd the primary side current iNpSum of the above-mentioned two inductors i is greater than the excitation inductance iLmCurrent flow;
the third working mode is as follows: at t3-t4At the moment, the first switch tube S1And the second switch tube S2Off, the first diode D1And the second diode D2Conducting in the forward direction;
secondary winding current i of the coupled inductorNsThrough the first diode D1And the second diode D2Follow current, said output diode D0Is still conducted, the secondary winding voltage of the coupled inductor is controlled by the output capacitor C0A clamp coupled to a primary winding of the coupled inductor, the excitation current iLmThe linear rising is continued and the slope is increased, and the leakage inductance LlkSubject to reverse voltage, said leakage-induced current iLkLinearly decreases, at which time the leakage inductance current iLkIs greater than the exciting current iLmCurrent of said primary side current iNpStill flows from the same name end until the leakage inductance current iLkAnd the excitation current iLmEquality, ending the modality;
the fourth working mode: at t4-t5At the moment, the output diode D0Off, the third diode D3Forward conduction, secondary winding current i of the coupled inductorNsIn the reverse direction, the first and second electrodes,
the secondary winding of the coupling inductor induces lower positive and upper negative voltage, the secondary winding voltage of the coupling inductor is smaller than that in a steady state, and the leakage inductance LlkThe upper voltage is larger, and the leakage inductance current iLkRapidly falls until the fourth diode D4Conducting and ending the mode;
a fifth working mode: at t5-t6Time of day, the fourth diode D4On, the excitation inductance LmAnd the leakage inductance LlkBy said supply of said third switched capacitor C3Charging;
is connected in series with the input power supply VgThrough the first diode D1And the second diode D2To the first switched capacitor C1Charging;
is then connected in series with the input power supply VgAnd a secondary winding N of the coupled inductorsThrough the second diode D2The third diode D3To the second switched capacitor C2Charging;
secondary winding N of the coupled inductorsVoltage is controlled by the first switched capacitor C1The second switch capacitor C2Clamping of said excitation current iLmLinearly decreasing, the primary side current iNpThe leakage inductance current i flows out from the same name endLkLess than the exciting inductance current iLm。
7. The novel Boost switched capacitor energy storage structure-based coupled inductor high-gain DC/DC converter according to claim 3, wherein the first current discontinuous mode DCM-I has five working modes, specifically:
a first mode of operation: at t0-t2The moment is the same as the second working mode of the current continuous mode CCM;
the second working mode is as follows: at t2-t3The time is the same as the third working mode of the current continuous mode CCM;
the third working mode is as follows: at t3-t4The time is the same as the fourth working mode of the current continuous mode CCM;
the fourth working mode: at t4-t5The moment is the same as the fifth working mode of the current continuous mode CCM;
a fifth working mode: at t5-t6At the moment when the leakage-induced current iLkDown to and with the excitation current iLmWhen the currents are equal, the secondary winding current i of the coupled inductorNsDrops to zero, the third diode D3Realize ZCS off, at this moment, the first switch tube S1And the second switch tube S2Non-conducting, secondary winding current i of said coupled inductorNsThe reverse direction is impossible, and the coupling part of the coupling inductor does not participate in the work; the excitation part and the leakage inductance of the coupling inductor charge the switch capacitor; is then connected in series with the input power supply VgElectricity (D) fromIs pressed through the first diode D1The second diode D2To the first switched capacitor C1And (6) charging.
8. The novel Boost switched capacitor energy storage structure-based coupled inductor high-gain DC/DC converter according to claim 3, wherein the second current discontinuous mode DCM-II has five working modes, specifically:
a first mode of operation: at t0-t1The moment is the same as the first working mode of the current continuous mode CCM;
the second working mode is as follows: at t1-t3The moment is the same as the second working mode of the current continuous mode CCM;
the third working mode is as follows: at t3-t4At the moment when the leakage-induced current iLkDown to and with the excitation current iLmWhen the currents are equal, the secondary winding current i of the coupled inductorNsDrops to zero, the output diode D0Realize ZCS off, at this moment, the first switch capacitor C1Is connected in series with the input power supply VgExcitation supply inductance LmLlkAnd leakage inductance energy storage, excitation inductance current iLmAnd leakage inductance current iLkEqual and linearly increasing;
the fourth working mode: at t4-t5At time t3-t4The time is the same as the fourth working mode of the current continuous mode CCM;
a fifth working mode: at t5-t6The time is the same as the fifth working mode of the current continuous mode CCM.
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| CN110224601A (en) * | 2019-07-12 | 2019-09-10 | 哈尔滨理工大学 | A kind of high-gain Boost and its working method based on three winding coupling inductance |
| CN215646609U (en) * | 2021-04-07 | 2022-01-25 | 哈尔滨修齐治平科技开发有限公司 | Novel high-boost switch capacitor DC-DC converter based on coupling inductor |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103051179A (en) * | 2012-12-26 | 2013-04-17 | 杭州科为达电气有限公司 | High step-up ratio voltage doubling structure passive lossless clamped converter |
| CN105515377A (en) * | 2016-01-26 | 2016-04-20 | 上海电力学院 | Soft switch high gain direct current converter based on coupling inductances and voltage doubling capacitors |
| CN110224601A (en) * | 2019-07-12 | 2019-09-10 | 哈尔滨理工大学 | A kind of high-gain Boost and its working method based on three winding coupling inductance |
| CN215646609U (en) * | 2021-04-07 | 2022-01-25 | 哈尔滨修齐治平科技开发有限公司 | Novel high-boost switch capacitor DC-DC converter based on coupling inductor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117220501A (en) * | 2023-09-15 | 2023-12-12 | 君翰玺(上海)医疗器械有限公司 | Power supply system of denture processing equipment |
| CN117220501B (en) * | 2023-09-15 | 2024-03-12 | 君翰玺(上海)医疗器械有限公司 | Power supply system of denture processing equipment |
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