CN113691125B - Zero-voltage turn-off zero-current turn-on high-gain Sepic converter - Google Patents
Zero-voltage turn-off zero-current turn-on high-gain Sepic converter Download PDFInfo
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- CN113691125B CN113691125B CN202110970814.8A CN202110970814A CN113691125B CN 113691125 B CN113691125 B CN 113691125B CN 202110970814 A CN202110970814 A CN 202110970814A CN 113691125 B CN113691125 B CN 113691125B
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- 230000000694 effects Effects 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 14
- 238000004088 simulation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Classifications
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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
- H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
A high-gain Sepic converter with zero-voltage turn-off and zero-current turn-on comprises a main circuit and an auxiliary circuit; the main circuit comprises a sepect transducer, at least one garment unit. The Sepic converter comprises a main inductor L1, a power switch tube S1, a diode D1 and a capacitor C1. The auxiliary circuit comprises a zero current inductor Lr, an auxiliary inductor Ls, a zero voltage capacitor Cr and diodes D2, D3 and D4. The converter provided by the invention realizes zero-voltage turn-off and zero-current turn-on of the power switch tube, eliminates the switching loss on the power switch tube S1, and can improve the efficiency of the converter.
Description
Technical Field
The invention relates to a direct current-direct current converter, in particular to a zero-voltage turn-off zero-current turn-on high-gain Sepic converter.
Background
In the existing switching power supply technology, the Sepic coat circuit well realizes high voltage gain, but in the high-gain DC/DC converter, in order to reduce the cost of the converter and improve the power density of the converter, the operating frequency of a switching tube of the converter needs to be improved, however, the current realization of high-frequency operation of the converter still has difficulty. The main reason is that with the improvement of the working frequency of the converter, the switching loss of the switching tube is correspondingly increased, so that the working efficiency of the converter is reduced, and the heating value is increased. In addition, the radiator volume and weight also increase. The increase in switching frequency mainly causes the following two problems:
(1) Switching loss problem: in the switching process of the power switch tube, the voltage and the current of the power switch tube are not zero, and an overlapping area appears, and the area is the switching loss of the power switch tube. The switching loss and the switching frequency are in a linear relation, and after the switching frequency is increased, the switching loss is obviously increased.
(2) EMI (Electromagnetic Interference) electromagnetic interference effect: when the converter is operated at high frequency, the voltage and current change faster, the waveform will appear significantly overshooting, the switching tube will have to produce higher du/dt and di/dt, which will have an effect on the power supply itself and the surrounding electronics, and will have switching noise, after further improvement of the switching frequency, the EMI problem will become more severe.
Aiming at the problems of the prior high-gain DC/DC converter, the soft switching technology is adopted, so that the switching loss can be reduced to zero theoretically, and meanwhile, the interference of the EMI problem on electronic devices can be reduced.
Disclosure of Invention
The invention provides a zero-voltage turn-off zero-current turn-on high-gain Sepic converter, which enables a power switch tube to realize zero-voltage turn-off and zero-current turn-on through an auxiliary circuit, and reduces the switching loss on the power switch tube in the circuit.
The technical scheme adopted by the invention is as follows:
a high-gain Sepic converter with zero-voltage turn-off and zero-current turn-on comprises a main circuit and an auxiliary circuit;
the main circuit comprises a Sepic converter and at least one garment unit;
the Sepic converter comprises an inductor L1, an inductor L2, a power switch tube S1, a capacitor C1, a diode D1 and a capacitor C2;
one end of the inductor L1 is connected with the anode of the input power supply, and the other end of the inductor L1 is respectively connected with the drain electrode of the power switch tube S1 and one end of the capacitor C1; the source electrode of the power switch tube S1 is connected with the cathode of the input power supply; the cathode of the diode D1 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is respectively connected with the other end of the inductor L2, the drain electrode of the power switch tube S1 and the cathode of the input power supply;
the coat unit comprises a capacitor Cn1, a capacitor Cn2, an inductor Ln1 and a diode Dn1, n is a natural number, n is more than or equal to 1, and the coat unit comprises five ports: port (1), port (2), port (3), port (4), port (5);
one end of the capacitor Cn1 is a port (1), the other end of the capacitor Cn1 is respectively connected with one end of the inductor Ln1 and the anode of the diode Dn1, the other end of the inductor Ln1 is a port (2), the cathode of the diode Dn1 is connected with one end of the capacitor Cn2, and the other end of the capacitor Cn2 is a port (3); the anode of the diode Dn1 is a port (4), and the cathode of the diode Dn1 is a port (5);
the port (1) is connected to the anode of the diode D1 in the Sepic converter, the port (2) is connected to the cathode of the diode D1 in the Sepic converter, and the port (3) is connected to the cathode of the input power supply;
the auxiliary circuit comprises a zero-current inductor Lr, an auxiliary inductor Ls, a zero-voltage capacitor Cr and diodes D2, D3 and D4;
one end of the zero-current inductor Lr is connected with the other end of the capacitor C1 in the Cuk converter and the anode of the diode D4;
the other end of the zero-current inductor Lr is respectively connected with one end of a capacitor C11 in the first coat unit, one end of an inductor L2 in the Sepic converter and the anode of a diode D1;
the cathode of the diode D2 is respectively connected with one end of an input power anode and one end of an inductor L1;
the anode of the diode D2 is respectively connected with one end of the zero-voltage capacitor Cr and the cathode of the diode D3;
the anode of the diode D3 is connected with one end of the auxiliary inductor Ls, and the other end of the auxiliary inductor Ls is connected with the cathode of the input power supply;
the cathode of the diode D4 is connected with one end of a capacitor C2 in the Sepic converter.
Of the n garment units,
the port (1) of the second garment unit is connected to the port (4) in the first garment unit,
the port (2) of the second garment unit is connected to the port (5) in the first garment unit,
a port (3) of the second coat unit is connected to the negative pole of the input power supply;
the port (1) of the third garment unit is connected to the port (4) in the second garment unit,
the port (2) of the third garment unit is connected to the port (5) in the second garment unit,
the port (3) of the third garment unit is connected to the negative input power supply;
...
The port (1) of the nth garment unit is connected to the port (4) in the n-1 th garment unit,
the port (2) of the nth garment unit is connected to the port (5) in the n-1 th garment unit,
the port (3) of the nth garment cell is connected to the negative input power source.
And the grid electrode of the power switch tube S1 is connected with a PWM controller.
The invention relates to a zero-voltage turn-off zero-current turn-on high-gain Sepic converter, which has the following technical effects:
1) When the power switch tube S1 is conducted, the power switch tube S1 is conducted under the condition of zero current due to the effect of the zero current inductor Lr, so that the turn-on loss of the power switch tube S1 is eliminated.
2) When the power switch tube S1 is turned off, the power switch tube S1 is turned off under the condition of zero voltage due to the effect of the zero voltage capacitor Cr, so that the turn-off loss of the power switch tube S1 is eliminated.
Drawings
FIG. 1 is a schematic overview of the transducer of the present invention
Figure 2 is a schematic diagram of a transducer of the present invention incorporating a garment unit.
FIG. 3 is a schematic diagram of a mode one transducer circuit of the present invention having a garment cell;
FIG. 4 is a schematic diagram of a second mode of transducer circuit of the present invention having a garment cell;
FIG. 5 is a schematic diagram of a third mode of transducer circuit of the present invention having a garment cell;
FIG. 6 is a schematic diagram of a fourth mode of transducer circuit of the present invention having a garment cell;
FIG. 7 is a schematic diagram of a fifth mode of transducer circuit of the present invention having a garment cell;
FIG. 8 is a schematic diagram of a sixth mode of transducer circuit of the present invention having a garment cell;
FIG. 9 is a schematic diagram of a mode seven of the transducer circuit of the present invention incorporating a garment cell;
FIG. 10 is a block diagram of a garment unit of the present invention;
fig. 11 is a schematic diagram of a garment unit of the present invention when n=1.
Fig. 12 is a simulation waveform diagram of the drive control signal, the input power supply Uin, and the output voltage Uo of the power switching transistor S1. Fig. 13 (1) Is a waveform diagram of the driving of the power switch S1, the current Is on the switch, and the voltage Us on the switch (zero current conduction);
fig. 13 (2) Is a waveform diagram of the driving of the power switch S1, the current Is across the switch, and the voltage Us across the switch (zero voltage off).
Detailed Description
As shown in fig. 1, a high-gain Sepic converter with zero-voltage off and zero-current on comprises a main circuit and an auxiliary circuit;
the main circuit comprises a Sepic converter and at least one garment unit;
the Sepic converter comprises an inductor L1, an inductor L2, a power switch tube S1, a capacitor C1, a diode D1 and a capacitor C2;
one end of the inductor L1 is connected with the positive electrode of the input power supply, the other end of the inductor L1 is respectively connected with the drain electrode of the power switch tube S1 and one end of the capacitor C1, the source electrode of the power switch tube S1 is connected with the negative electrode of the input power supply, the other end of the capacitor C1 is connected with the anode of the diode D1 and one end of the inductor L2, the cathode of the diode D1 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is respectively connected with the other end of the inductor L2, the drain electrode of the power switch tube S1 and the negative electrode of the input power supply;
as shown in fig. 10, the garment unit comprises a capacitor Cn1, a capacitor Cn2, an inductor Ln1, and a diode Dn1, n is a natural number, n is equal to or greater than 1, and the garment unit comprises five ports: port (1), port (2), port (3), port (4), port (5);
one end of the capacitor Cn1 is connected with the port (1), the other end of the capacitor Cn1 is respectively connected with one end of the inductor Ln1 and the anode of the diode Dn1, the other end of the inductor Ln1 is connected with the port (2), the cathode of the diode Dn1 is connected with one end of the capacitor Cn2, and the other end of the capacitor Cn2 is connected with the port (3); the anode of the diode Dn1 is a port (4), and the cathode of the diode Dn1 is a port (5);
the port (1) is connected to the anode of the diode D1 in the Sepic converter, the port (2) is connected to the cathode of the diode D1 in the Sepic converter, and the port (3) is connected to the cathode of the input power supply;
the auxiliary circuit comprises a zero-current inductor Lr, an auxiliary inductor Ls, a zero-voltage capacitor Cr and diodes D2, D3 and D4;
one end of the zero-current inductor Lr is connected with the other end of the capacitor C1 in the Cuk converter and the anode of the diode D4;
the other end of the zero-current inductor Lr is respectively connected with one end of a capacitor C11 in the garment unit when n=1, one end of an inductor L2 in the Sepic converter and the anode of a diode D1;
the cathode of the diode D2 is respectively connected with one end of an input power anode and one end of an inductor L1;
the anode of the diode D2 is respectively connected with one end of the zero-voltage capacitor Cr and the cathode of the diode D3;
the anode of the diode D3 is connected with one end of the auxiliary inductor Ls;
the cathode of the diode D4 is connected with one end of a capacitor C2 in the Sepic converter;
of the n garment units,
the port (1) of the second garment unit is connected to the port (4) in the first garment unit,
the port (2) of the second garment unit is connected to the port (5) in the first garment unit,
a port (3) of the second coat unit is connected to the negative pole of the input power supply;
the port (1) of the third garment unit is connected to the port (4) in the second garment unit,
the port (2) of the third garment unit is connected to the port (5) in the second garment unit,
the port (3) of the third garment unit is connected to the negative input power supply;
...
The port (1) of the nth garment unit is connected to the port (4) in the n-1 th garment unit,
the port (2) of the nth garment unit is connected to the port (5) in the n-1 th garment unit,
the port (3) of the nth garment cell is connected to the negative input power source.
And the grid electrode of the power switch tube S1 is connected with a PWM controller.
Two ends of the capacitor Cn2 are respectively connected with two ends of the load RL.
The grid electrode of the power switch tube S1 is connected with a PWM controller
Examples:
as shown in fig. 2, for example, a garment unit is included:
a zero-voltage turn-off zero-current turn-on high-gain Sepic converter comprises a traditional Sepic converter, two garment units and an auxiliary circuit. The conventional Sepic converter includes two inductors L1, L2, a power switch S1, a diode D1, and two capacitors C1, C2. The first garment unit comprises an inductance L11, two capacitances C11, C12 and a diode D11. The auxiliary circuit part comprises a zero current auxiliary inductance Lr, an auxiliary inductance Ls, a zero voltage auxiliary capacitance Cr, and three diodes D2, D3, D4. The circuit connection relation is as follows:
one end of an inductor L1 in the traditional Sepic converter is connected with an input power supply anode, the other end of the inductor L1 is respectively connected with a drain electrode of a power switch tube S1, one end of a capacitor C1 and the other end of Cr in an auxiliary unit, a source electrode of the power switch tube S1 is connected with an input power supply cathode, the other end of the capacitor C1 is connected with an anode of a diode D4 and one end of a zero-voltage inductor Lr, the other end of the inductor Lr is respectively connected with one end of an inductor L2, an anode of the diode D1 and the left end of a coat unit C11, a cathode of the diode D1 is respectively connected with the upper end of the capacitor C2, the cathode of the diode D4 and the lower end of the inductor L11, and the other end of the inductor L2 is connected with the source electrode of the power switch tube S1 and the input power supply cathode;
the auxiliary unit comprises: one end of the zero-current inductor Lr is connected with the other end of the capacitor C1 in the Sepic converter and the anode of the diode D4; the other end of the zero-current inductor Lr is respectively connected with one end of a capacitor C11 in the garment unit when n=1, one end of an inductor L2 in the Sepic converter and the anode of a diode D1; the cathode of the diode D2 is respectively connected with one end of an input power anode and one end of an inductor L1; the anode of the diode D2 is respectively connected with one end of the zero-voltage capacitor Cr and the cathode of the diode D3; the anode of the diode D3 is connected with one end of the auxiliary inductor Ls; the cathode of the diode D4 is connected with one end of a capacitor C2 in the Sepic converter;
in the garment unit: one end of the capacitor C11 is connected with the port (1), the other end of the capacitor C11 is respectively connected with one end of the inductor L11 and the anode of the diode D11, the other end of the inductor L11 is connected with the port (2), the cathode of the diode D11 is connected with one end of the capacitor C12, and the other end of the capacitor C12 is connected with the port (3); the anode of the diode D11 is a port (4), and the cathode of the diode D11 is a port (5);
the port (1) is connected to the anode of the diode D1 in the Sepic converter, the port (2) is connected to the cathode of the diode D1 in the Sepic converter, and the port (3) is connected to the cathode of the input power supply;
according to the difference of the conduction conditions of the power switch tube S1 and the diode, the working process of the circuit can be divided into 7 working modes, and the specific conditions are as follows:
modality one:
at the beginning of the mode, the main switch S1 is conducted under the ZCS condition because the magnitude and the direction of the current on the zero current inductor Lr and the inductor L1 cannot be suddenly changed. In this mode, diodes D1, D3, D11 are on, inductors L1, L11 and Ls are discharged, capacitors C1, C2, C12 are charged, and capacitor C11 is discharged. Diode D3 is turned on and resonance starts between auxiliary inductance Ls and zero voltage capacitance Cr. Thus, the Cr voltage decreases sinusoidally and the Ls current increases sinusoidally. In the working process, the main inductances L1 and Lr are linearly reduced, the current of the auxiliary inductance Ls is in sine tension, and when the zero-current inductance Lr is linearly reduced to be iL1-iC1, the mode is ended.
Mode two:
in this mode, the diodes D1 and D11 are turned off, and the inductor L1 in the main circuit starts to charge, and the current increases linearly. The capacitors C1, C2, C12 start to discharge and charge the inductances L11, lr and the capacitor C11, respectively. The resonance continues between the auxiliary inductance Ls and the zero voltage capacitance Cr, and when the voltage across the zero voltage capacitance Cr in the auxiliary circuit reaches the negative input voltage-Vin, the diode D2 starts to conduct under ZVS conditions, the Cr voltage being clamped at this level, and the mode ends.
Modality three:
when diode D2 starts to conduct under ZVS conditions, mode three starts, and energy is stored due to the current flowing through inductor Ls during resonance with zero voltage capacitor Cr. When the voltage on Cr reaches the negative input voltage-Vin, the inductor Ls freewheels through the diode D3 to feed energy back to the input power supply. The working state of the components in the main circuit is the same as the previous mode. When the inductor Ls current drops to zero and the diode D2 turns off, the mode ends.
Modality four:
in this mode, the auxiliary circuit stops operating, and the circuit enters a normal operation mode. The working state of the components in the main circuit is the same as that of the previous mode, and the load is continuously supplied with power by the C22. When the power switch S1 is turned off, this mode ends.
Mode five:
in mode five, the power switch S1 is turned off at ZVS due to the zero voltage Cr. In this mode, the operating state of the components in the main circuit is the same as in the previous mode, and the load is continuously powered by the C22. The inductor L1 current discharges Cr linearly and when Vcr reaches zero, the inductor L1 current charges Cr linearly. When Vcr reaches Vc1-Vin, diode D4 begins to conduct under ZVS conditions, the Cr voltage is clamped at this level, and the mode ends.
Modality six:
when diode D4 is turned on, mode six starts, diode D4 starts to turn on under ZVS conditions, the current of inductors L1, L11 decreases linearly, charge capacitors C1, C11, C22 and the load, C2 charges, lr current decreases to zero, and the mode ends.
Mode seven:
when Lr current decreases to zero, mode seven begins, in which mode diode D1 is turned on and the auxiliary circuit ends, the circuit returns to normal mode with the current of inductors L1, L11 decreasing linearly, charging capacitors C1, C2, C12 and the load, and C11 discharging.
Simulation parameters:
the switching frequency f is 50k, and the power supply U is input in 48V, output voltage U o The duty ratio of the power switching tube S1 is 0.735V, and the rated power Po is 300W.
Fig. 12 is a simulation waveform diagram of the drive control signal, the input power supply Uin, and the output voltage Uo of the power switching transistor S1. It can be seen that the above-described circuit achieves the high gain requirements required for the design.
Fig. 13 (1) and 13 (2) are simulation waveforms of the driving of the power switching tube S1, the current Is across the switching tube, and the voltage Us across the power switching tube S1. The simulation waveform shows that the auxiliary circuit realizes the functions of zero current conduction and zero voltage turn-off of the power switch tube.
The invention realizes zero-voltage turn-off and zero-current turn-on of the power switch tube, eliminates the switching loss on the power switch tube S1, and can improve the switching frequency of the power switch tube S1.
Claims (4)
1. A zero-voltage turn-off zero-current turn-on high-gain Sepic converter is characterized in that: the converter comprises a main circuit and an auxiliary circuit; the main circuit comprises a Sepic converter and at least one garment unit;
the Sepic converter comprises an inductor L1, an inductor L2, a power switch tube S1, a capacitor C1, a diode D1 and a capacitor C2;
one end of the inductor L1 is connected with the anode of the input power supply, and the other end of the inductor L1 is respectively connected with the drain electrode of the power switch tube S1 and one end of the capacitor C1; the source electrode of the power switch tube S1 is connected with the cathode of the input power supply; the cathode of the diode D1 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is respectively connected with the other end of the inductor L2, the drain electrode of the power switch tube S1 and the cathode of the input power supply;
the coat unit comprises a capacitor Cn1, a capacitor Cn2, an inductor Ln1 and a diode Dn1, n is a natural number, n is more than or equal to 1, and the coat unit comprises five ports: port (1), port (2), port (3), port (4), port (5);
one end of the capacitor Cn1 is a port (1), the other end of the capacitor Cn1 is respectively connected with one end of the inductor Ln1 and the anode of the diode Dn1, the other end of the inductor Ln1 is a port (2), the cathode of the diode Dn1 is connected with one end of the capacitor Cn2, and the other end of the capacitor Cn2 is a port (3); the anode of the diode Dn1 is a port (4), and the cathode of the diode Dn1 is a port (5);
the port (1) is connected to the anode of the diode D1 in the Sepic converter, the port (2) is connected to the cathode of the diode D1 in the Sepic converter, and the port (3) is connected to the cathode of the input power supply;
the auxiliary circuit comprises a zero-current inductor Lr, an auxiliary inductor Ls, a zero-voltage capacitor Cr and diodes D2, D3 and D4;
one end of the zero-current inductor Lr is connected with the other end of the capacitor C1 in the Cuk converter and the anode of the diode D4;
the other end of the zero-current inductor Lr is respectively connected with one end of a capacitor C11 in the first coat unit, one end of an inductor L2 in the Sepic converter and the anode of a diode D1;
the cathode of the diode D2 is respectively connected with one end of an input power anode and one end of an inductor L1;
the anode of the diode D2 is respectively connected with one end of the zero-voltage capacitor Cr and the cathode of the diode D3;
the anode of the diode D3 is connected with one end of the auxiliary inductor Ls, and the other end of the auxiliary inductor Ls is connected with the cathode of the input power supply;
the cathode of the diode D4 is connected with one end of a capacitor C2 in the Sepic converter;
when comprising a garment unit, the operation of the circuit is divided into 7 modes:
modality one:
at the beginning of the mode, the main switch S1 is conducted under the ZCS condition because the current magnitude and direction on the zero-current inductor Lr and the inductor L1 cannot be suddenly changed; in the mode, the diodes D1, D3 and D11 are conducted, the inductors L1, L11 and Ls are discharged, the capacitors C1, C2 and C12 are charged, and the capacitor C11 is discharged; the diode D3 is conducted, and resonance starts between the auxiliary inductor Ls and the zero-voltage capacitor Cr; thus, the Cr voltage decreases sinusoidally and the Ls current increases sinusoidally; in the working process, the main inductances L1 and Lr are linearly reduced, the current of the auxiliary inductance Ls is in sine tension, and when the zero-current inductance Lr is linearly reduced to be iL1-iC1, the mode I is ended;
mode two:
in the second mode, the diodes D1 and D11 are cut off, the inductor L1 in the main circuit starts to charge, and the current increases linearly; the capacitors C1, C2, C12 start to discharge and charge the inductors L11, lr and the capacitor C11, respectively; continuing resonance between the auxiliary inductor Ls and the zero-voltage capacitor Cr, when the voltage at two ends of the zero-voltage capacitor Cr in the auxiliary circuit reaches negative input voltage-Vin, the diode D2 starts to conduct under the ZVS condition, the Cr voltage is clamped at the level, and the second mode is ended;
modality three:
when the diode D2 starts to conduct under ZVS condition, the third mode starts, and energy is stored due to the current flowing through the inductor Ls during the resonance with the zero-voltage capacitor Cr; when the voltage on Cr reaches the negative input voltage-Vin, the inductor Ls will feed back energy to the input power supply through the follow current of the diode D3; the working state of the components in the main circuit is the same as that of the previous mode; when the current of the inductor Ls is reduced to zero and the diode D2 is cut off, the third mode is finished;
modality four:
in the fourth mode, the auxiliary circuit stops acting, and the circuit enters a normal working mode; the working state of the components in the main circuit is the same as that of the previous mode, and the load is continuously supplied with power by C22; when the power switch tube S1 is turned off, the fourth mode is finished;
mode five:
in mode five, due to the zero voltage Cr, the power switch tube S1 is turned off under ZVS; in the mode, the working state of components in the main circuit is the same as that of the previous mode, and the load is continuously supplied with power by C22; the inductance L1 current linearly discharges Cr, and when Vcr reaches zero, the inductance L1 current linearly charges Cr; when Vcr reaches Vc1-Vin, diode D4 begins to conduct under ZVS condition, cr voltage is clamped at this level, and mode five ends;
modality six:
when the diode D4 is conducted, the mode six begins, the diode D4 begins to conduct under the ZVS condition, the currents of the inductors L1 and L11 linearly decrease, the capacitors C1, C11 and C22 and the load are charged, the C2 is charged, the Lr current is reduced to zero, and the mode six ends;
mode seven: when the Lr current is reduced to zero, the mode seven starts, the diode D1 is conducted under the mode seven, the auxiliary circuit finishes working, the current of the circuit returns to the normal mode inductances L1 and L11 to linearly drop, the capacitors C1, C2 and C12 and the load are charged, and the C11 is discharged.
2. The zero-voltage off zero-current on high-gain Sepic converter of claim 1, wherein: of the n garment units,
the port (1) of the second garment unit is connected to the port (4) in the first garment unit,
the port (2) of the second garment unit is connected to the port (5) in the first garment unit,
a port (3) of the second coat unit is connected to the negative pole of the input power supply;
the port (1) of the third garment unit is connected to the port (4) in the second garment unit,
the port (2) of the third garment unit is connected to the port (5) in the second garment unit,
the port (3) of the third garment unit is connected to the negative input power supply;
...
The port (1) of the nth garment unit is connected to the port (4) in the n-1 th garment unit,
the port (2) of the nth garment unit is connected to the port (5) in the n-1 th garment unit,
the port (3) of the nth garment cell is connected to the negative input power source.
3. The zero-voltage off zero-current on high-gain Sepic converter of claim 1, wherein: and the grid electrode of the power switch tube S1 is connected with a PWM controller.
4. The zero-voltage off zero-current on high-gain Sepic converter of claim 1, wherein: when the power switch tube S1 is conducted, the power switch tube S1 is conducted under the condition of zero current due to the effect of the zero current inductor Lr, so that the turn-on loss of the power switch tube S1 is eliminated;
when the power switch tube S1 is turned off, the power switch tube S1 is turned off under the condition of zero voltage due to the effect of the zero voltage capacitor Cr, so that the turn-off loss of the power switch tube S1 is eliminated.
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| CN106787724A (en) * | 2016-12-29 | 2017-05-31 | 三峡大学 | One kind switch zero voltage turn-off dual input high-gain DC/DC converters |
| CN111725993A (en) * | 2020-06-17 | 2020-09-29 | 辽宁工程技术大学 | High-efficiency Sepic soft switch converter and control method thereof |
| CN111786555A (en) * | 2020-07-22 | 2020-10-16 | 福州大学 | Zero-ripple high-gain DC-DC converter based on novel boosting unit |
| CN113258774A (en) * | 2021-05-19 | 2021-08-13 | 三峡大学 | Zero-voltage turn-off zero-current turn-on high-gain Boost converter |
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| CN106787724A (en) * | 2016-12-29 | 2017-05-31 | 三峡大学 | One kind switch zero voltage turn-off dual input high-gain DC/DC converters |
| CN111725993A (en) * | 2020-06-17 | 2020-09-29 | 辽宁工程技术大学 | High-efficiency Sepic soft switch converter and control method thereof |
| CN111786555A (en) * | 2020-07-22 | 2020-10-16 | 福州大学 | Zero-ripple high-gain DC-DC converter based on novel boosting unit |
| CN113258774A (en) * | 2021-05-19 | 2021-08-13 | 三峡大学 | Zero-voltage turn-off zero-current turn-on high-gain Boost converter |
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Application publication date: 20211123 Assignee: Nanjing Chixun Electric Technology Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980049857 Denomination of invention: A High Gain Sepic Converter with Zero Voltage Off and Zero Current On Granted publication date: 20231027 License type: Common License Record date: 20231206 |