CN113162408B - 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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- CN113162408B CN113162408B CN202110372300.2A CN202110372300A CN113162408B CN 113162408 B CN113162408 B CN 113162408B CN 202110372300 A CN202110372300 A CN 202110372300A CN 113162408 B CN113162408 B CN 113162408B
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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 following components: the novel Boost switch capacitor energy storage module is formed by connecting two ends of a first switch capacitor with a drain electrode of the first switch tube and a cathode of a second diode connected with a source electrode of the switch tube respectively; the primary side of the coupling inductor is respectively connected with the series structure of the third switch capacitor and the fourth diode in parallel, the switch capacitor module is connected with the second switch tube in parallel, 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 inductance 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 principles of parallel charging and serial discharging of the switch capacitor, and compared with the traditional switch power supply, the switch capacitor converter does not contain magnetic components, so that the volume of the switch power supply can be greatly reduced, the power density can be improved, and the EMI problem can be greatly relieved.
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 switching capacitor in parallel, and then the switching capacitor is connected in series to discharge the load, so that the Boost and Buck-Boost converters can be improved by two times or more. Because of the existence of the energy storage unit, the inductance is utilized to charge the switching capacitance, and the charging time of the inductance can be controlled so as to realize continuous and adjustable output voltage. However, if the step-up ratio is to be further increased, the duty ratio of the switching tube needs to be increased, so that the inductor stores more energy during the on period, however, an excessive duty ratio can cause high conduction loss of the switching tube and cause the problem of reverse recovery of the diode. When higher voltage gain is achieved, more switch capacitor units still need to be overlapped, and more switch tubes and diode devices are used.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the invention aims to provide a coupling inductance high-gain (Switched Capacitor and Coupled Inductor High Gain, SCCIHG) DC/DC converter based on a novel Boost switch capacitor energy storage structure, which can obtain a desired high-gain output voltage by low-duty-cycle operation of a switch tube under the condition of using fewer devices.
To achieve the above objective, an embodiment of the present invention provides a coupling inductance high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure, including: an input power V g, a first switching tube S 1, a second switching tube S 2, an output diode D 0, a first diode D 1, a second diode D 2, a third diode D 3, a fourth diode D 4, an output capacitor C 0, a first switching capacitor C 1, a second switching capacitor C 2, a third switching capacitor C 3, a coupling inductor and a load R, wherein,
The source electrode of the first switch tube S 1 is connected with the cathode of the first diode D 1, the drain electrode of the first switch tube S 1 is connected with the cathode of the second diode D 2, and two ends of the first switch capacitor C 1 are respectively connected with the drain electrode of the first switch tube S 1 and the anode of the first diode D 1 connected with the source electrode of the first switch tube S 1 to form a novel Boost switch capacitor energy storage module;
The positive pole of the input power supply V g is connected with the primary winding of the coupling inductor between the positive pole of the first diode D 1 of the novel Boost switch capacitor energy storage module, the primary winding of the coupling inductor is respectively connected with the third switch capacitor C 3 and the series structure of the output diode D 0 and the fourth diode D 4 in parallel, the novel Boost switch capacitor energy storage module is connected with the series structure of the second switch tube S 2, the secondary winding of the coupling inductor, the second switch capacitor C 2 and the third diode D 3 in parallel, and the output capacitor C 0 is connected with the load resistor R in parallel and is respectively connected with the cathode of the output diode D 0 and the positive pole of the third diode D 3.
According to the coupling inductance high-gain DC/DC converter based on the novel Boost switch capacitor energy storage structure, under the condition that fewer devices are used, a switch tube runs with a low duty ratio to obtain expected high-gain output voltage, 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 born by the switching device is lower; the method has strong expandability, and can adjust the turn ratio of the transformer and the structure of the Boost energy storage unit to meet different voltage gain ratio conditions.
In addition, the coupling inductance 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 C 1 increases the voltage when the energy storage inductor stores energy, thereby increasing the voltage of each switched capacitor. In the novel Boost switch capacitor energy storage module, when the first switch tube S 1 is conducted, all the novel Boost switch capacitor energy storage module bears reverse voltage, the positive electrode of the first switch capacitor C 1 is connected with the negative end of the input power supply V g in series, so that the novel Boost switch capacitor energy storage module stores energy for the coupling inductor, when the first switch tube S 1 is turned off, all the diodes are positively biased, the negative electrode of the first switch capacitor C 1 is connected with the negative end of the input power supply V g in series, and the coupling inductor transmits energy to the switch capacitor.
Further, in one embodiment of the present invention, when the first switching tube S 1 and the second switching tube S 2 are turned on, the input power V g is connected in series with the first switching capacitor C 1 to charge the coupled inductor, and at the same time, the first switching capacitor C 1, the second switching capacitor C 2, the third switching capacitor C 3, the input power V g and the secondary winding of the coupled inductor are connected in series to transfer energy to the load R; when the first switching tube S 1 and the second switching tube S 2 are turned off, the energy stored in the coupling inductor charges the first switching capacitor C 1, the second switching capacitor C 2, and the third switching capacitor C 3 in parallel.
Further, in one embodiment of the invention, the coupled inductor comprises an ideal transformer with a turns ratio of N p：Ns, an excitation inductance L m, and a leakage inductance L lk.
Further, in one embodiment of the present invention, the high-gain DC/DC converter is divided into a current continuous mode CCM (Constant Current Mode, CCM) and a current discontinuous mode DCM (Discontinuous Current Mode, DCM) according to whether the secondary winding current of the coupling inductor is continuous or not, wherein the high-gain DC/DC converter operates in the current continuous mode CCM when the secondary winding current of the coupling inductor is continuous throughout a preset stabilization period; when the secondary winding current of the coupling inductor is continuous during the on period of the first switching tube S 1 and the second switching tube S 2 and is discontinuous during the off period, the high-gain DC/DC converter operates in a first current discontinuous mode DCM-I; when the secondary winding current of the coupled inductor is interrupted during the on-period of the first switching tube S 1 and the second switching tube S 2 and the off-period is continuous, the high-gain DC/DC converter operates in a second current interruption mode DCM-II.
Further, in one embodiment of the present invention, five operation modes exist in the current continuous mode CCM, specifically:
First working mode: at time t 0-t1, the first switching tube S 1 and the second switching tube S 2 are turned on, the first diode D 1, The second diode D 2 and the fourth diode D 4 are turned off by receiving a reverse voltage drop, the secondary winding current i Ns of the coupled inductor freewheels through the second diode D 3, The voltage on the primary winding of the coupling inductor is clamped by the second switch capacitor C 2, the voltage of the primary winding of the coupling inductor is also kept to be negative, positive and negative, and the exciting current i Lm continuously drops linearly; The first switch capacitor C 1 is connected in series with the input power supply V g and the exciting inductance L m to store energy for the leakage inductance L lk, The leakage current i Lk rises rapidly, at this time, the leakage current i Lk is smaller than the exciting current i Lm, the primary winding current i Np of the coupling inductor still flows from the same-name end, When the exciting current i Lm is equal to the leakage current i Lk, ending the mode;
Second mode of operation: at time t 1-t2,t2-t3, the third diode D 3 is turned off, the output diode D 0 is turned on, the secondary winding current i Ns of the coupled inductor is reversed, During the on-off period of the first switching tube S 1 and the second switching tube S 2, the output capacitor continuously supplies power to the load, the upper voltage value is lower, the upper voltage of the secondary winding of the coupling inductor is also lower, the leakage inductance L lk is higher, The leakage inductance current i Llk rises; the input power V g is connected in series with the first switch capacitor C 1 to store energy for the excitation inductance L m and the leakage inductance L lk, The exciting current i Lm rises linearly; The secondary winding N s of the coupling inductor induces a positive-up and negative-down voltage, which is serially connected with the input power V g, the first switch capacitor C 1, the second switch capacitor C 2, the third switched capacitor C 3 supplies power to the output capacitor C o and the load R through the output diode D 0; The secondary winding current i Ns of the coupling inductor flows out from the homonymous end and is refracted to the primary winding through magnetic induction coupling, the primary winding current i Np of the coupling inductor flows in from the homonymous end, the leakage inductance current is the sum of the exciting inductance current i Lm and the primary current i Np, And is larger than the exciting inductance i Lm current;
Third mode of operation: at time t 3-t4, the first switching tube S 1 and the second switching tube S 2 are turned off, and the first diode D 1 and the second diode D 2 are turned on in the forward direction; the secondary winding current i Ns of the coupled inductor freewheels through the first diode D 1 and the second diode D 2, the output diode D 0 is still conducting, The secondary winding voltage of the coupled inductor is clamped by the output capacitor C 0, coupled to the primary winding of the coupled inductor, the excitation current i Lm continues to rise linearly and increases in slope, the leakage inductance L lk is subject to a reverse voltage, The leakage inductance current i Lk drops linearly, at this time, the leakage inductance current i Lk is larger than the exciting current i Lm, the primary side current i Np still flows from the same-name end, Until the leakage inductance current i Lk is equal to the excitation current i Lm, ending the mode;
Fourth mode of operation: at time t 4-t5, the output diode D 0 is turned off, the third diode D 3 is turned on in the forward direction, the secondary winding current i Ns of the coupling inductor is reversed, the secondary winding of the coupling inductor induces a voltage which is positive and negative, the secondary winding voltage of the coupling inductor is smaller than that in steady state, the voltage on the leakage inductance L lk is larger, the leakage inductance current i Lk is rapidly reduced until the fourth diode D 4 is turned on, and the mode is ended;
Fifth mode of operation: at time t 5-t6, the fourth diode D 4 is turned on, and the excitation inductance L m and the leakage inductance L lk charge the third switched capacitor C 3; Charging the first switched capacitor C 1 via the first diode D 1 and the second diode D 2 in series with the input power V g; The input power V g and the secondary winding N s of the coupling inductor are connected in series again to charge the second switch capacitor C 2 through the second diode D 2 and the third diode D 3; The secondary winding N s voltage of the coupled inductor is clamped by the first switched capacitor C 1, the second switched capacitor C 2, the excitation current i Lm drops linearly, The primary side current i Np flows out from the same-name end, and the leakage inductance current i Lk is smaller than the excitation inductance current i Lm.
Further, in one embodiment of the present invention, the first current interrupt mode DCM-I has five modes of operation, specifically: first working mode: at time t 0-t2, the second operating mode is the same as the second operating mode of the current continuous mode CCM; second mode of operation: at time t 2-t3, the same as the third working mode of the current continuous mode CCM; Third mode of operation: at time t 3-t4, the same as the fourth operating mode of the current continuous mode CCM; fourth mode of operation: at time t 4-t5, the same as the fifth operating mode of the current continuous mode CCM; Fifth mode of operation: at time t 5-t6, when the leakage current i Lk drops to be equal to the excitation current i Lm, the secondary winding current i Ns of the coupled inductor drops to zero, The third diode D 3 achieves ZCS turn-off, at this time, the first switching tube S 1 and the second switching tube S 2 are not turned on, the secondary winding current i Ns of the coupled inductor cannot be reversed, the coupling part of the coupling inductor does not participate in the work; the excitation part and leakage inductance of the coupling inductor charge the switch capacitor; The voltage of the input power V g is then serially connected to charge the first switched capacitor C 1 through the first diode D 1 and the second diode D 2.
Further, in one embodiment of the present invention, the second current interrupt mode DCM-II has five modes of operation, specifically: first working mode: at time t 0-t1, the first operating mode is the same as the first operating mode of the current continuous mode CCM; second mode of operation: at time t 1-t3, the second operating mode is the same as the second operating mode of the current continuous mode CCM; third mode of operation: at time t 3-t4, when the leakage inductance current i Lk drops to be equal to the excitation current i Lm, the secondary winding current i Ns of the coupling inductor drops to zero, the output diode D 0 realizes ZCS turn-off, at this time, the first switch capacitor C 1 is connected in series with the input power V g to store energy for the excitation inductance L mLlk and the leakage inductance, and the excitation inductance current i Lm is equal to the leakage inductance current i Lk and rises linearly; fourth mode of operation: at time t 4-t5, at time t 3-t4, the same as the fourth operating mode of the current continuous mode CCM; fifth mode of operation: at time t 5～t6, the same as the fifth operating 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.
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The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a topological structure diagram of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure according to one embodiment of the present invention;
FIG. 2 is a topology of a novel switched capacitor energy storage module according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of the on state and the 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, wherein (a) is the on state of the switching tube and (b) is the off state of the switching tube;
FIG. 4 is a diagram of the main waveform change of a coupled inductor high-gain DC/DC converter in a current continuous mode CCM based on a novel Boost switched capacitor energy storage structure according to one embodiment of the present invention;
Fig. 5 is a schematic diagram of a modal 6 current loop of a novel Boost switched capacitor energy storage structure-based coupled inductor high-gain DC/DC converter according to an embodiment of the present invention in a current continuous mode CCM, where (a) is a current flow diagram at time t 0-t1, (b) is a current flow diagram at time t 2-t3, (c) is a current flow diagram at time t 3-t4, (d) is a current flow diagram at time t 4-t5, and (e) is a current flow diagram at time t 5-t6;
FIG. 6 is a diagram of the main waveform change of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a first current interrupt mode DCM-I according to one embodiment of the present invention;
FIG. 7 is a schematic diagram of a modal 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 interrupt mode DCM-I according to one embodiment of the present invention;
FIG. 8 is a diagram of the main waveform change of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in a second current interrupt mode DCM-II according to one embodiment of the present invention;
FIG. 9 is a schematic diagram of a modal 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 interrupt mode DCM-II according to one embodiment of the present invention;
FIG. 10 is a waveform diagram of an open loop input output voltage current experiment of a coupled inductor high gain DC/DC converter based on a novel Boost switched capacitor energy storage structure according to one embodiment of the present invention;
FIG. 11 is a graph of experimental waveform changes of primary and secondary side voltage and current of a coupling inductor of a 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 graph of the primary and secondary side current waveform of the coupling inductor, and (b) is a graph of the primary and secondary side voltage waveform of the coupling inductor;
fig. 12 is a waveform diagram of main voltage and current experiment of a coupling inductance high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure under a current continuous mode CCM, wherein (a) is a waveform diagram of primary and secondary side current of a coupling inductor, and (b) is a waveform diagram of primary and secondary side voltage of the coupling inductor;
Fig. 13 is a graph of experimental waveforms of voltage of a diode 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 graph of experimental waveforms of a driving signal and D 1、D2、D3, and (b) is a graph of experimental waveforms of a driving signal and D 4、Do;
FIG. 14 is a diagram showing the main experimental waveform of a coupled inductor high-gain DC/DC converter based on a novel Boost switched capacitor energy storage structure in the first current interrupt mode DCM-I, wherein (a) is the primary and secondary side current waveform of the coupled inductor, and (b) is the D 3 voltage-current and amplified waveform;
In a second current interrupt mode DCM-II shown in fig. 15, the waveform of the coupling inductor is mainly an experimental waveform of the DC/DC converter with high gain based on the novel Boost switch capacitor energy storage structure, where (a) is a primary and secondary side current waveform of the coupling inductor, and (b) is a D o voltage-current and amplified waveform.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a coupling inductance high-gain DC/DC converter based on a novel Boost switch capacitor energy storage structure according to an embodiment of the invention with reference to the accompanying drawings.
Fig. 1 is a topological structure diagram of 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.
As shown in fig. 1, the apparatus 10 includes: input power V g, first switch tube S 1, second switch tube S 2, output diode D 0, first diode D 1, second diode D 2, third diode D 3, fourth diode D 4, output capacitance C 0, first switch capacitance C 1, second switch capacitance C 2, third switch capacitance C 3, coupled inductor, and load R.
The source electrode of the first switch tube S 1 is connected with the cathode of the first diode D 1, the drain electrode of the first switch tube S 1 is connected with the cathode of the second diode D 2, and two ends of the first switch capacitor C 1 are respectively connected with the drain electrode of the first switch tube S 1 and the anode of the first diode D 1 connected with the source electrode thereof, so as to construct the novel Boost switch capacitor energy storage module.
The first switched capacitor C 1 increases the voltage of the energy storage inductor during energy storage, thereby increasing the voltage of each switched capacitor. In the novel Boost switch capacitor energy storage module, when the first switch tube S 1 is conducted, all diodes in the novel Boost switch capacitor energy storage module bear reverse voltage, and the positive electrode of the first switch capacitor C 1 is connected with the negative end of the input power supply V g in series to store energy for the coupling inductor; when the first switching tube S 1 is turned off, all diodes are forward biased, the negative pole of the first switching capacitor C 1 is connected in series with the negative pole of the input power V g, and the coupling inductor transfers energy to the switching capacitor.
Specifically, as shown in fig. 2, the novel Boost switched capacitor energy storage module provided by the invention increases the charging voltage of an inductor in the stage of inductance energy storage, so that the energy provided for the switched capacitor in the stage of discharging is increased, and the boosting ratio is greatly improved finally. During the conduction period of the switching tube, the voltage of the input power supply V g is connected in series with the switching capacitor to provide charging voltage for the inductor; during the turn-off period of the switching tube, the switching capacitors are connected in parallel, and the input power supply V g is connected in series with the inductor to charge the capacitors.
Further, as shown in fig. 3, taking the simplest switched capacitor converter structure of the novel Boost energy storage module as an example, the Boost ratio can be improved to a greater extent through simplified analysis. The operation mode of the switching tube can be simplified into two main modes of switching tube on and switching tube off under the condition that the transient process is not considered.
In order to meet the high boosting requirement during photovoltaic power generation, the invention provides a novel high boosting DC/DC converter of the coupling inductance, which is based on a multiple Boost energy storage structure, based on the multiple Boost switch capacitance energy storage unit and combined with a coupling inductance, wherein the coupling inductance comprises an ideal transformer with a turns ratio of N p：Ns, an excitation inductance L m and a leakage inductance L lk.
Specifically, the specific connection relation of the high-gain DC/DC converter provided by the invention is as follows: the positive pole of the input power supply V g is connected with the primary winding of a coupling inductor between the positive pole of the first diode D 1 of the novel Boost switch capacitor energy storage module, the primary winding of the coupling inductor is respectively connected with the third switch capacitor C 3 and the serial structure of the output diode D 0 and the fourth diode D 4 in parallel, the novel Boost switch capacitor energy storage module is connected with the second switch tube S 2 in parallel, the secondary winding of the coupling inductor, the second switch capacitor C 2 and the serial structure of the third diode D 3 in parallel, the output capacitor C 0 is connected with the load R in parallel, and the cathode of the output diode D 0 and the anode of the third diode D 3 are respectively connected.
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 switching tube S 1 and the second switching tube S 2 are conducted, the input power supply V g is connected in series with the first switching capacitor C 1 to charge the coupling inductor, and meanwhile, the first switching capacitor C 1, the second switching capacitor C 2, the third switching capacitor C 3, the input power supply V g and the secondary winding of the coupling inductor are connected in series to transmit energy to the load R, so that the output voltage is greatly improved; when the first switching tube S 1 and the second switching tube S 2 are turned off, the energy stored in the coupling inductor charges the first switching capacitor C 1, the second switching capacitor C 2 and the third switching capacitor C 3 in parallel, and the voltage across each switching capacitor is greatly increased.
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. In a stable period, when the secondary winding current of the coupling inductor is continuous all the time, the high-gain DC/DC converter operates in a current continuous mode CCM; when the secondary winding current of the coupled inductor continues during the on period of the first switching tube S 1 and the second switching tube S 2 and is intermittent during the off period, the high-gain DC/DC converter operates in a first current interrupt mode DCM-I; when the secondary winding current of the coupled inductor is interrupted during the on-period of the first switching tube S 1 and the second switching tube S 2 and is continuous during the off-period, the high-gain DC/DC converter is operated in the second current interruption mode DCM-II. The first current interrupt mode DCM-I can realize zero current turn-off of the third diode D 3, and the second current interrupt mode DCM-II can realize zero current turn-off of the output diode D 0.
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, and the on-resistance and the forward on-voltage are ignored;
(3) Turns ratio 1 of coupled inductor: n s is defined as N p：Ns, and the coupling coefficient k is equal to L m/(Lm+Lk).
As shown in fig. 4, a main waveform including transient of the novel high-gain DC/DC converter based on the Boost switched capacitor energy storage unit and the coupling inductor is provided in the current continuous mode CCM. Wherein v gs is the driving signal of the switches S 1 and S 2, i Lk is the primary winding leakage current waveform of the coupling inductor, i Ns is the secondary winding current waveform of the coupling inductor, i Lm is the primary winding excitation current waveform of the coupling inductor, v S1、vS1 is the drain-source voltage waveform of the first switch tube S 1 and the second switch tube S 2, and v D1、vD2、vD3、vD4 is the reverse voltage waveform of the first diode D 1, the second diode D 2, the third diode D 3 and the fourth diode D 4, respectively. Within one switching period, six switching modes can be divided, and an equivalent circuit of each mode is shown in fig. 5.
Specifically, as shown in fig. 5 (a), the first operation mode: at time [ t 0,t1 ], the first switching tube S 1 and the second switching tube S 2 are conducted, the first diode D 1, The second diode D 2 and the fourth diode D 4 are turned off by receiving a reverse voltage drop. The secondary winding current i Ns of the coupling inductor freewheels through the third diode D 3, the voltage on the secondary winding current i Ns is clamped by the second switch capacitor C 2, the voltage of the primary winding of the coupling inductor is also kept to be negative left and positive right, and the exciting current i Lm continuously linearly drops; The first switch capacitor C 1 is connected in series with the input power V g and the excitation inductance L m to store energy for the leakage inductance L lk, Accordingly, the leakage inductance L lk receives a large voltage of positive and negative left and right, the leakage inductance current i Lk rises rapidly, at this time, the exciting current i Lm is smaller than the leakage inductance current i Lk, The primary winding current i Np of the coupled inductor still flows from the same-name end, and the mode ends when the excitation current i Lm is equal to the leakage current i Lk.
As shown in fig. 5 (b), the second operation mode: at time [ t 1,t2],[t2,t3 ], the third diode D 3 turns off, the output diode D 0 turns on, and the secondary winding current i Ns of the coupled inductor is reversed. Because the output capacitor continuously supplies power to the load during the on-off period of the first switch tube S 1 and the second switch tube S 2, the upper voltage value is lower, the upper voltage of the secondary winding of the coupling inductor is also lower, the leakage inductance L lk is higher, The leakage current i Llk rises for a short period of time, after which the rise rate of i Llk becomes slow. The input power V g is connected in series with the first switch capacitor C 1 to store energy for the excitation inductance L m and the leakage inductance L lk, the exciting current i Lm rises linearly; Simultaneously, the secondary winding N s of the coupling inductor induces positive and negative voltages, which are serially connected with the input power V g, the first switch capacitor C 1, the second switch capacitor C 2, The third switched capacitor C 3 supplies power to the output capacitor C o and the load R through the output diode D 0; The secondary winding current i Ns of the coupling inductor flows out from the homonymous end, is refracted to the primary winding through magnetic induction coupling, the primary winding current i Np of the coupling inductor flows in from the homonymous end, the leakage inductance current is the sum of the exciting inductance current i Lm and the primary current i Np, and is therefore greater than the magnetizing inductance i Lm current during this period.
As shown in fig. 5 (c), the third operation mode: at [ t 3,t4 ], the first switching tube S 1 and the second switching tube S 2 are turned off, and the first diode D 1 and the second diode D 2 are turned on in the forward direction; the secondary winding current i Ns of the coupled inductor freewheels through the first diode D 1 and the second diode D 2, the output diode D 0 is still on, The secondary winding voltage of the coupled inductor is clamped by the output capacitor C 0, the excitation current i Lm continues to rise linearly and the slope increases, the leakage inductance L lk bears the reverse voltage, the leakage inductance current i Lk drops linearly, whereby the current i Ns flowing through the secondary winding drops rapidly. At this time, since the leakage current i Lk is larger than the exciting current i Lm, the primary current i Np still flows from the same-name end until the leakage current i Lk is equal to the exciting current i Lm, The modality ends.
As shown in fig. 5 (d), a fourth mode of operation: at time t 4,t5, the output diode D 0 turns off, the third diode D 3 turns on in the forward direction, and the secondary winding current i Ns of the coupled inductor is reversed. The secondary winding of the coupling inductor induces a lower positive and lower negative voltage, and the first switch capacitor C 1 is charged and the second switch capacitor C 2 is discharged in the second working mode, so that the secondary winding voltage of the coupling inductor is smaller than that in a steady state, the voltage on the leakage inductance L lk is larger, the leakage inductance current i Lk is rapidly reduced until the fourth diode D 4 is conducted, and the mode existence time is short.
As shown in fig. 5 (e), the fifth operation mode: at time [ t 5,t6 ], the fourth diode D 4 is turned on, and the excitation inductance L m and the leakage inductance L lk are charged by charging the third switch capacitor C 3; The series input power V g charges the first switched capacitor C 1 through the first diode D 1 and the second diode D 2; The series input power V g and the secondary winding N s of the coupled inductor charge the second switched capacitor C 2 through the second diode D 2 and the third diode D 3. The secondary winding N s voltage of the coupled inductor is clamped by the first switched capacitor C 1, the second switched capacitor C 2, the excitation current i Lm drops linearly, the primary current i Np flows from the same-name end, and the leakage inductance current i Lk is smaller than the excitation inductance current i Lm.
Further, 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 interrupt mode DCM-I, the secondary winding current of the coupling inductor is continuous when the switch is turned on, and is interrupted when the switch is turned off, so that the ZCS turn-off of the third diode D 3 is realized.
As shown in fig. 6, the first current interrupt mode DCM-I has five operation modes, specifically:
first working mode: at time [ t 0,t2 ], the second working mode is the same as the second working mode of the current continuous mode CCM;
Second mode of operation: at time [ t 2,t3 ], the current continuous mode CCM is the same as the third working mode;
third mode of operation: at time [ t 3,t4 ], the system is the same as a fourth working mode of the current continuous mode CCM;
Fourth mode of operation: at time [ t 4,t5 ], the system is the same as the fifth working mode of the current continuous mode CCM;
Fifth mode of operation: as shown in fig. 7, at time [ t 5,t6 ], when the leakage inductance current i Lk drops to be equal to the excitation current i Lm, the secondary winding current i Ns of the coupling inductor drops to zero, the third diode D 3 realizes ZCS turn-off, at this time, the first switching tube S 1 and the second switching tube S 2 are not turned on, the secondary winding current i Ns of the coupling inductor cannot be reversed, and the coupling part of the coupling inductor does not participate in operation; the excitation part and leakage inductance of the coupling inductor charge the switch capacitor; the voltage of the serial input power V g charges the first switch capacitor C 1 through the first diode D 1 and the second diode D 2. In this mode, the exciting current i Lm is equal to the leakage current i Lk and linearly decreases, and the secondary winding i Ns current is always zero.
Further, when the novel high-gain DC/DC converter based on the Boost switch capacitor energy storage unit and the coupling inductor is lighter in load, the novel high-gain DC/DC converter can operate in a second current interruption mode DCM-II, the secondary side current of the coupling inductor is continuous when the switch is turned off, and is intermittent when the switch is turned on, so that the output diode D 0 can be turned off to realize ZCS.
As shown in fig. 8, the second current interrupt mode DCM-II has five operation modes, specifically:
First working mode: at time [ t 0,t1 ], the first working mode is the same as the first working mode of the current continuous mode CCM;
Second mode of operation: at time [ t 1,t3 ], the second working mode is the same as the second working mode of the current continuous mode CCM;
Third mode of operation: as shown in fig. 9, at time [ t 3,t4 ], when the leakage inductance current i Lk drops to be equal to the excitation current i Lm, the secondary winding current i Ns of the coupling inductor drops to zero, the output diode D 0 realizes ZCS turn-off, at this time, the first switch capacitor C 1 is connected in series with the input power V g to store energy for the excitation inductance L mLlk and the leakage inductance, and the excitation inductance current i Lm is equal to the leakage inductance current i Lk and rises linearly;
Fourth mode of operation: at time [ t 4,t5 ], at time t 3～t4, the same as the fourth operating mode of the current continuous mode CCM;
Fifth mode of operation: at time [ t 5,t6 ], the mode is the same as the fifth operation mode of the current continuous mode CCM.
In an ideal case, the effects of coupling inductance leakage inductance, parasitic capacitance and transient are ignored in order to simplify the derivation of the voltage gain. In the on and off states of the first switching tube S 1, the second switching tube S 2, the voltage of the excitation inductance Lm can be expressed by the formula (1) and the formula (2):
In the method, in the process of the invention, The primary side of the exciting winding bears voltage when the switching tube is switched on or off, V g is the power supply voltage,The voltage is applied to the first switched capacitor.
The excitation inductance L m satisfies the volt-second balance theorem in one stable period, as shown in formula (3):
the voltages across the first switched capacitor C 1 can be expressed as:
Where D is the duty cycle and T is a cycle time.
During the switch off period, the primary winding N p and the secondary winding N s are connected in series to input a voltage source V g to supply energy to the C 2, and the primary and secondary winding voltages can be obtained:
In the method, in the process of the invention, The primary side and the secondary side of the exciting winding bear voltage when the switching tube is turned off,The voltage is applied to the second switched capacitor.
Likewise, the voltage across the third switched capacitor C 3 can be expressed as:
In the method, in the process of the invention, The voltage is applied to the third switched capacitor.
During the switch on period, the coupling winding secondary inductance series power supply V g, the first switch capacitor C 1, the second switch capacitor C 2, the third switch capacitor C 3 and the power supply to the load R can obtain the following output voltage:
Where V o is the converter output voltage.
Bringing equations (4), (7) and (8) into equation (9) to obtain an output voltage gain M of
Where M is the voltage gain and n is the transformer turn ratio.
A prototype verification is built below to verify the coupling inductance and switch capacitance high-gain DC/DC converter based on the multiple Boost energy storage structure.
First, the prototype index is as follows:
(1) Input voltage: 25-40Vdc;
(2) Output voltage: 400Vdc;
(3) Output power: rated power 200W;
(4) Operating frequency: 100KHz;
(5) Efficiency is that: not less than 90%;
next, the current continuous mode CCM is verified:
As shown in fig. 10, for the output voltage, current and driving signal experimental waveforms, it can be seen that the output voltage reaches 380V at an input voltage of 25V, the voltage gain is 15.2, and the output current is about 0.523A. When the duty ratio is 0.35, the output power is 200W, and the output voltage ripple is smaller, so that the design index requirement is met.
As shown in fig. 11, experimental waveforms of the driving signals of the first switching tube S 1, the second switching tube S 2, and the primary-secondary side current voltage of the coupled inductor are given. when the first switch tube S 1 and the second switch tube S 2 are conducted, the input power supply V g is connected in series with the first switch capacitor C 1 to charge the coupling inductor, the voltage of the same-name terminal is positive, the voltage of the primary side and the secondary side is the sum of the voltage of the input power supply V g and the voltage of the first switch capacitor C 1, and the current of the primary side winding rises linearly. Meanwhile, the secondary winding of the coupling inductor is connected in series with the input power supply V g, the first switch capacitor C 1, the second switch capacitor C 2 and the third switch capacitor C 3 to supply power to the output capacitor C 0 and the load R. When the first switch tube S 1 and the second switch tube S 2 are turned off, the primary side current of the coupling inductor reaches the maximum value. When the first switch tube S 1 and the second switch tube S 2 are turned off, the primary side voltage and the secondary side voltage of the coupling inductor are the difference between the voltage of the first switch capacitor C 1 and the input power voltage V g, the voltage of the same-name terminal is negative, and each switch capacitor is charged.
As shown in fig. 12, the driving signal and the switching tube drain-source voltage are respectively given along with the voltage waveforms of the first, second, and third switching capacitances C 1, C 2, C 3. When the first switch tube S 1 and the second switch tube S 2 are turned on, the first switch capacitor C 1, the second switch capacitor C 2 and the third switch capacitor C 3 are connected in series to supply energy to the load R, and the voltage drops. When the first switch tube S 1 and the second switch tube S 2 are turned off, the voltage stress of the first switch tube S 1 and the second switch tube S 2 is about 80V and is far lower than the output voltage, the primary side and the secondary side of the coupling inductor are the energy storage of the first switch capacitor C 1, the second switch capacitor C 2 and the third switch capacitor C 3, the voltage of the coupling inductor rises, and the ripple wave meets the design index.
As shown in fig. 13, the voltage test waveforms of the first diode D 1, the second diode D 2, the third diode D 3, the fourth diode D 4, and the output diode D 0 are respectively. At a nominal duty cycle of 0.35, the voltage stresses of the first diode D 1 and the second diode D 2 are 76V, well below the output voltage, and the voltage stresses of the third diode D 3, the fourth diode D 4, and the output diode D 0 are 154V, 224V, and 300V consistent with theoretical calculations in steady state analysis.
Next, the first current interrupt mode DCM-I is verified:
When the coupling inductance and the switch capacitance high-gain DC/DC converter based on the multiple Boost energy storage structure operates in DCM-I, the secondary side current of the coupling inductance is continuous when the switch is turned on, and is discontinuous when the switch is turned off, so that the third diode D 3 realizes ZCS turn-off. As shown in fig. 14, a primary-secondary side current experimental waveform and a diode D 3 voltage-current experimental waveform of a coupling inductor of the proposed high-gain DC/DC converter based on a multiple Boost energy storage structure are given in DCM-I. As can be seen from fig. 14 (a), when the switch is off, the coupled inductor ends 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 D 3 current naturally drops to zero off, achieving zero current off.
Next, the first current interrupt mode DCM-II is verified:
When the coupling inductance and the switch capacitance high-gain DC/DC converter based on the multiple Boost energy storage structure operates in DCM-II, the secondary side current of the coupling inductance is continuous when the switch is turned off and discontinuous when the switch is turned on, so that the output diode D 0 can realize ZCS turn-off. As shown in fig. 15, the primary and secondary side current experimental waveforms of the coupling inductor of the proposed high-gain DC/DC converter based on the coupling inductor and the switched capacitor of the multiple Boost energy storage structure and the voltage-current experimental waveform of the output diode D o under DCM-II are given. As can be seen from fig. 13 (a), when the switch is turned on, the secondary winding of the coupling inductor is connected in series with the input power V g, the first switch capacitor C 1, the second switch capacitor C 2, and the third switch capacitor C 3 to supply power to the output capacitor C o and the load R, and due to the lighter load R, the secondary current drops to zero during the on period of the switch until the switch is turned off and then reverses direction. As can be seen from fig. 15 (b), the output diode D 0 is turned off after the current naturally drops to zero during the on period of the switch, and zero current turn-off is achieved.
In summary, the coupling inductance high-gain DC/DC converter based on the novel Boost switch capacitor energy storage structure provided by the embodiment of the invention can obtain expected high-gain output voltage by low-duty-cycle operation of a switch tube under the condition of using fewer devices, 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 born by the switching device is lower; the method has strong expandability, and can adjust the turn ratio of the transformer and the structure of the Boost energy storage unit to meet different voltage gain ratio conditions.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (6)
1. The utility model provides a coupling inductance high gain DC/DC converter based on Boost switched capacitor energy storage structure which characterized in that includes: an input power V g, a first switching tube S 1, a second switching tube S 2, an output diode D 0, a first diode D 1, a second diode D 2, a third diode D 3, a fourth diode D 4, an output capacitor C 0, a first switching capacitor C 1, a second switching capacitor C 2, a third switching capacitor C 3, a coupling inductor and a load R, wherein,
The source electrode of the first switch tube S 1 is connected with the cathode of the first diode D 1, the drain electrode of the first switch tube S 1 is connected with the cathode of the second diode D 2, and two ends of the first switch capacitor C 1 are respectively connected with the source electrode of the first switch tube S 1 and the anode of the second diode D 2 to form a Boost switch capacitor energy storage module;
The positive pole of the input power supply V g is connected with the primary winding of the coupling inductor between the positive pole of the first diode D 1 of the Boost switch capacitor energy storage module, one end of the primary winding of the coupling inductor is connected with one end of the third switch capacitor C 3, the other end of the primary winding of the coupling inductor is connected with the anode of the fourth diode D 4, the other end of the third switch capacitor C 3 is connected with the cathode of the fourth diode D 4 and the anode of the output diode D 0, The source of the second switch tube S 2 is connected with the anode of the first diode D 1, the anode of the fourth diode D 4 and one end of the secondary winding of the coupling inductor, and the drain of the second switch tube S 2 is connected with the anode of the second diode D 2, The cathode of the third diode D 3 is connected, the other end of the secondary winding of the coupling inductor is connected with the anode of the third diode D 3 through the second switch capacitor C 2, the output capacitor C 0 is connected with the load R in parallel, and is connected to the cathode of the output diode D 0 and the anode of the third diode D 3, respectively;
In the Boost switched capacitor energy storage module, when the first switch tube S 1 is turned on, all diodes in the Boost switched capacitor energy storage module are subjected to reverse voltage, the positive electrode of the first switch capacitor C 1 is connected in series with the negative end of the input power supply V g to store energy for the coupling inductor, when the first switch tube S 1 is turned off, all diodes are forward biased, the negative electrode of the first switch capacitor C 1 is connected in series with the negative end of the input power supply V g, and the coupling inductor transfers energy to the switching capacitor;
When the first switch tube S 1 and the second switch tube S 2 are turned on, the input power V g is connected in series with the first switch capacitor C 1 to charge the coupling inductor, and meanwhile, the first switch capacitor C 1, the second switch capacitor C 2, the third switch capacitor C 3, the input power V g and the secondary winding of the coupling inductor are connected in series to transfer energy to the load R;
When the first switching tube S 1 and the second switching tube S 2 are turned off, the energy stored in the coupling inductor charges the first switching capacitor C 1, the second switching capacitor C 2, and the third switching capacitor C 3 in parallel.
2. The Boost switched capacitor energy storage structure based coupled inductor high gain DC/DC converter of claim 1 wherein said coupled inductor comprises an ideal transformer with turns ratio N p：Ns, excitation inductance L m and leakage inductance L lk.
3. The coupled inductor high-gain DC/DC converter based on Boost switched capacitor energy storage structure according to claim 1, wherein said high-gain DC/DC converter is divided into a current continuous mode CCM and a current discontinuous mode DCM, depending on whether the secondary winding current of said coupled inductor is continuous or not, wherein, during a preset settling period,
When the secondary winding current of the coupling 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 coupling inductor is continuous during the on period of the first switching tube S 1 and the second switching tube S 2 and is discontinuous during the off period, the high-gain DC/DC converter operates in a first current discontinuous mode DCM-I;
When the secondary winding current of the coupled inductor is interrupted during the on-period of the first switching tube S 1 and the second switching tube S 2 and the off-period is continuous, the high-gain DC/DC converter operates in a second current interruption mode DCM-II.
4. The coupled inductor high-gain DC/DC converter according to claim 3, wherein five operation modes exist in the current continuous mode CCM, specifically:
First working mode: at time t 0-t1, the first switching tube S 1 and the second switching tube S 2 are turned on, the first diode D 1, the second diode D 2 and the fourth diode D 4 are turned off by receiving reverse voltage drops,
The secondary winding current i Ns of the coupling inductor freewheels through the third diode D 3, the voltage on the secondary winding current i Ns is clamped by the second switch capacitor C 2, the voltage of the primary winding of the coupling inductor is also kept to be negative left and positive right, and the exciting current i Lm continuously drops linearly; the first switch capacitor C 1 is connected in series with the input power V g and the excitation inductor L m to store energy for the leakage inductance L lk, the leakage inductance current i Lk rises rapidly, at this time, the leakage inductance current i Lk is smaller than the excitation current i Lm, the primary winding current i Np of the coupling inductor still flows from the same-name end, and when the excitation current i Lm is equal to the leakage inductance current i Lk, the mode ends;
Second mode of operation: at time t 1-t2,t2-t3, the third diode D 3 is turned off, the output diode D 0 is turned on, the secondary winding current i Ns of the coupling inductor is reversed, the output capacitor continuously supplies power to the load during the on-off period of the first switching tube S 1 and the second switching tube S 2, the upper voltage value is lower, the voltage on the secondary winding of the coupling inductor is lower, the leakage inductance L lk is high, and the leakage inductance current i Llk rises;
The input power supply V g is connected in series with the first switch capacitor C 1 to store energy for the excitation inductance L m and the leakage inductance L lk, and the excitation current i Lm rises linearly; the secondary winding N s of the coupling inductor induces voltages with positive upper and negative lower, which are connected in series with the input power supply V g and the first switch capacitor C 1, the second switch capacitor C 2 and the third switch capacitor C 3 to supply power to the output capacitor C o and the load R through the output diode D 0;
The secondary winding current i Ns of the coupling inductor flows out from the homonymous end and is refracted to the primary winding through magnetic induction coupling, the primary winding current i Np of the coupling inductor flows in from the homonymous end, and the leakage inductance current is the sum of the exciting inductance current i Lm and the primary current i Np and is larger than the exciting inductance i Lm current;
Third mode of operation: at time t 3-t4, the first switching tube S 1 and the second switching tube S 2 are turned off, and the first diode D 1 and the second diode D 2 are turned on in the forward direction;
The secondary winding current i Ns of the coupling inductor freewheels through the first diode D 1 and the second diode D 2, the output diode D 0 is still on, the secondary winding voltage of the coupling inductor is clamped by the output capacitor C 0 and is coupled to the primary winding of the coupling inductor, the exciting current i Lm continues to rise linearly and increases in slope, the leakage inductance L lk bears reverse voltage, the leakage inductance current i Lk drops linearly, at this time, the leakage inductance current i Lk is greater than the exciting current i Lm, the primary current i Np still flows from the same name end until the leakage inductance current i Lk is equal to the exciting current i Lm, and the mode ends;
Fourth mode of operation: at time t 4-t5, the output diode D 0 turns off, the third diode D 3 turns on in the forward direction, the secondary winding current i Ns of the coupled inductor reverses,
The secondary winding of the coupling inductor induces a lower positive and lower negative voltage, the secondary winding voltage of the coupling inductor is smaller than that in a steady state, the voltage on the leakage inductance L lk is larger, the leakage inductance current i Lk drops rapidly until the fourth diode D 4 is conducted, and the mode is ended;
Fifth mode of operation: at time t 5-t6, the fourth diode D 4 is turned on, and the excitation inductance L m and the leakage inductance L lk charge the third switched capacitor C 3;
Charging the first switched capacitor C 1 via the first diode D 1 and the second diode D 2 in series with the input power V g;
The input power V g and the secondary winding N s of the coupling inductor are connected in series again to charge the second switch capacitor C 2 through the second diode D 2 and the third diode D 3;
The secondary winding N s voltage of the coupling inductor is clamped by the first switch capacitor C 1 and the second switch capacitor C 2, the exciting current i Lm linearly decreases, the primary current i Np flows out from the same-name end, and the leakage inductance current i Lk is smaller than the exciting inductance current i Lm.
5. The coupled inductor high-gain DC/DC converter according to claim 3, wherein the first current interrupt mode DCM-I has five modes of operation, specifically:
First working mode: at time t 0-t2, the second operating mode is the same as the second operating mode of the current continuous mode CCM;
Second mode of operation: at time t 2-t3, the same as the third working mode of the current continuous mode CCM;
third mode of operation: at time t 3-t4, the same as the fourth operating mode of the current continuous mode CCM;
fourth mode of operation: at time t 4-t5, the same as the fifth operating mode of the current continuous mode CCM;
Fifth mode of operation: at time t 5-t6, when the leakage inductance current i Lk drops to be equal to the excitation current i Lm, the secondary winding current i Ns of the coupling inductor drops to zero, the third diode D 3 realizes ZCS turn-off, at this time, the first switching tube S 1 and the second switching tube S 2 are not turned on, the secondary winding current i Ns of the coupling inductor cannot be reversed, and the coupling part of the coupling inductor does not participate in operation; the excitation part and leakage inductance of the coupling inductor charge the switch capacitor; the voltage of the input power V g is then serially connected to charge the first switched capacitor C 1 through the first diode D 1 and the second diode D 2.
6. The coupled inductor high-gain DC/DC converter according to claim 3, wherein the second current interrupt mode DCM-II has five modes of operation, specifically:
first working mode: at time t 0-t1, the first operating mode is the same as the first operating mode of the current continuous mode CCM;
second mode of operation: at time t 1-t3, the second operating mode is the same as the second operating mode of the current continuous mode CCM;
Third mode of operation: at time t 3-t4, when the leakage inductance current i Lk drops to be equal to the excitation current i Lm, the secondary winding current i Ns of the coupling inductor drops to zero, the output diode D 0 realizes ZCS turn-off, at this time, the first switch capacitor C 1 is connected in series with the input power V g to store energy for the excitation inductance L mLlk and the leakage inductance, and the excitation inductance current i Lm is equal to the leakage inductance current i Lk and rises linearly;
Fourth mode of operation: at time t 4-t5, at time t 3-t4, the same as the fourth operating mode of the current continuous mode CCM;
Fifth mode of operation: at time t 5-t6, the same as the fifth operating mode of the current continuous mode CCM.
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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 |
| CN105515377B (en) * | 2016-01-26 | 2018-05-04 | 上海电力学院 | A kind of soft-switching and high-gain DC converter based on coupling inductance and times voltage capacitance |
| CN110224601B (en) * | 2019-07-12 | 2021-03-09 | 哈尔滨理工大学 | High-gain Boost converter based on three-winding coupling inductor and working method thereof |
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| 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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