CN113410990A - High-efficiency high-gain quasi-Z-source soft switching DC-DC converter - Google Patents
High-efficiency high-gain quasi-Z-source soft switching DC-DC converter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a high-efficiency high-gain quasi-Z source soft switching DC-DC converter, which comprises a DC power supply VgEnergy storage inductor L1The clamping unit, the coupling inductance unit and the load side; the DC power supply VgFor an energy-storing inductor L1Providing energy; a clamping unit clamping a voltage spike generated by a leakage inductance of a coupling inductance of the coupling inductance unit to a fixed value and transferring energy to a load side; the coupling inductance unit utilizes the charging and discharging of the coupling inductance to adjust the duty ratio D and the turn ratio n, so as to realize high-voltage conversion. The invention can realize the arbitrary double regulation of the voltage gain through the direct duty ratio and the turn ratio of the coupling inductor; the active elements all realize soft switching; relatively few passive components; under the action of active clamp circuit, the efficiency and electromagnetic interference are improved and increasedThe reliability of the circuit operation is improved.
Description
Technical Field
The invention belongs to the technical field of DC-DC conversion equipment, and particularly relates to a high-efficiency high-gain quasi-Z-source soft-switching DC-DC converter.
Background
In recent years, high-gain DC-DC boost converters have played an increasingly important role in many industrial applications, such as uninterruptible power supplies, renewable energy systems, distributed photovoltaic power generation systems, and DC micro-grids. In applications such as grid-tied systems or UPS, a high gain converter is used as an interface between a low voltage input source (photovoltaic panel, fuel cell, and battery pack) and an inverter to meet the high voltage requirements at the input of the inverter. Such applications require a high gain converter that can provide high efficiency and continuous input current.
The document "H Ardi, A Ajami, and M Sabahi. A novel high step-up DC-DC converter with continuous input current integrating coupled inductor for regenerative applications [ J ]. IEEE transactions on industrial electronics,2018,65(2): 1306-. The use of soft switching is an effective way to overcome switching losses and improve power converter efficiency. The documents "M Forouzesh, Y Shen, K Yari, Y P Siwakoti, and F Blaabjerg. high-efficiency high step-up DC-DC converter with a dual coupled inverter for grid-connected photovoltaic systems [ J ]. IEEE transactions on power electronics,2018,33(7): 5967) 5982" propose a soft switching converter with a snubber capacitor active clamp circuit, which, although excellent in performance, comprises four switching tubes, which complicates the structure and increases the cost. The document "S W Lee and H L Do. high step-up coupled-inductor cathode DC-DC converter with a low loss passive transformer [ J ]. IEEE transactions on industrial electronics,2018,65(10):7753 and 7761" proposes a secondary boost converter with coupled inductor, which adopts a passive lossless snubber circuit to realize soft switching performance. Although it only contains one switching tube, a relatively large number of passive components are used. Quasi-impedance source (QZS) networks provide continuous input current and common input and output, and are therefore widely used. The documents "M Haji-Esomaeli, E Babaii, and M Sabahi. high step-up precision-Z source DC-DC converter [ J ]. IEEE transactions on power electronics,2018,33(12): 10563-.
Therefore, it has become a research focus in the art to find a DC-DC converter with simple structure, continuous input current, high efficiency and high gain.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a high-efficiency high-gain quasi-Z source soft switching DC-DC converter aiming at the defects of the prior art, the converter integrates a coupling inductor and a quasi-Z source structure, has simple structure, continuous input current and high voltage gain, a synchronous switching tube is used for replacing a quasi-Z source diode in the converter, and the switching tube realizes the zero-voltage switching (ZVS) characteristic; meanwhile, the conduction and the disconnection of the first diode and the second diode occur under the condition of zero-voltage zero-current switching (ZVZCS), and the efficiency of the converter is improved.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a high-efficiency high-gain quasi-Z source soft switch DC-DC converter comprises a DC power supply VgEnergy storage inductor L1The clamping unit, the coupling inductance unit and the load side;
the DC power supply VgFor an energy-storing inductor L1Providing energy;
the clamping unit clamps a voltage peak generated by the leakage inductance of the coupling inductor unit to a fixed value and transfers energy to a load side;
the coupling inductance unit utilizes the charging and discharging of the coupling inductance to adjust the duty ratio D and the turn ratio n, so as to realize high-voltage conversion.
In order to optimize the technical scheme, the specific measures adopted further comprise:
the clamping unit comprises a first switch tube S1And its anti-parallel diode DS1And a buffer capacitor CS1A second switch tube S2And its anti-parallel diode DS2And a buffer capacitor CS2A first capacitor C1And a second capacitor C2；
The coupling inductance unit comprises a first winding L of a coupling inductance2aA second winding L2bA third capacitor C3And a first diode D1；
The load side comprises a secondPolar tube DoAn output capacitor CoAnd a load R;
the energy storage inductor L1And a first winding L of a coupling inductor2aThe current difference and the current sum between the first switch tube S1And a second switching tube S2The parallel buffer capacitors are fully charged and discharged and are controlled by dead time, so that the first diode D1And a second diode DoOperating in a Zero Voltage Switching (ZVS) environment;
a first winding L of the coupling inductor2aA second winding L2bFor achieving high gain of the circuit;
the clamping unit collects the leakage inductance energy of the coupling inductor and finally transfers the leakage inductance energy to the load side, and lossless absorption of the energy of the clamping capacitor is achieved.
The energy storage inductor L1One end of (1) and a DC power supply VgConnected to the other end of the first capacitor C of the clamping unit2Negative pole and second switch tube S2The common ends of the cathodes are connected;
in the clamping unit, a first switch tube S1Positive electrode of and a second capacitor C2Is connected to the positive pole of a second capacitor C2And the second switch tube S2Is connected with the negative pole of the second switch tube S2Positive electrode of and first capacitor C1Is connected to the positive pole of a first capacitor C1Negative pole of (2) and first switch tube S1Negative electrode and DC power supply VgIs connected with the negative pole of the first switching tube S1And a second switching tube S2The gate source electrode is used for receiving a control signal of an external main control chip, and the switching of different working states of the circuit is realized by controlling the on or off of the switching tube through the change of the duty ratio;
in the coupling inductance unit, the first winding and the second winding are dotted terminals, and the turn ratio is 1: n, the first winding L2aA second winding L2bConnected in series with a third capacitor and then connected with a first diode D1Parallel, first winding L2aPositive electrode and first diode D1Common terminal of cathode and first capacitor C1Positive and second switch tube S2Common to the positive electrodeEnd-to-end, first winding L2aNegative pole and third capacitor C3The common terminal of the negative electrode and the first switch tube S1Positive electrode and second capacitor C2The common terminal of the positive electrodes are connected, and a second winding L2bCathode and first diode D1Second diode D of anode common terminal and output sideoThe cathodes are connected to transfer energy to the load side;
in the load side, an output capacitor CoConnected in parallel with the load R and then connected with a second diode DoAre connected in series.
The first switch tube S1A second switch tube S2The MOS tubes with N channels are adopted, and the grid and the source electrodes of the MOS tubes can receive control signals of an external main control chip.
Control of the first switching tube S by a unipolar PWM control method1A second switch tube S2The on-state or the off-state is achieved, the working efficiency of the switch tube can be improved, the switching loss is reduced, and therefore the working efficiency of the whole circuit is improved.
When the DC-DC converter is in a direct-through state, the first switch tube S1Conducting the second switch tube S2Off, the first diode D1On, the second diode DoDifference V between the output voltage and the first capacitoro-VC1Reverse biasing; first and second capacitors C1、C2Discharging; exciting inductor current i of first winding of coupling inductorLmDecreases to zero and then increases in the reverse direction to positive; leakage inductance L of second winding of coupling inductor2kAnd a capacitor C1Always resonant, current iin、iLmThe sum of the resonant current flows through the first switch tube S1(ii) a When the resonant current drops to zero, the first diode D1Shut down under ZVZCS conditions.
When the DC-DC converter is switched off, the first switch tube S1Off, the second switching tube S2On, the second diode DoStarting to conduct under ZVZCS condition, the first diode D1Difference V between the output voltage and the first capacitoro-VC1Reverse bias, first capacitor C1The charging is carried out all the time,input voltage VgAnd a third capacitance C3Excitation inductor and energy storage inductor L which are both a first winding of a coupling inductor1Second winding L of coupled inductor2bAnd the load side supplies energy, and the excitation inductor of the first winding of the coupling inductor is a second capacitor C2Charging, exciting current iLmDecreases until zero, at which time the input voltage VgAnd a second and a third capacitor C2、C3Together being an energy-storing inductor L1Second winding L of coupled inductor2bAnd a second capacitor C for supplying energy to the load side2Reversely charging the exciting inductor of the first winding of the coupling inductor by exciting current iLmAnd increases in the opposite direction. When going negative iLmIs greater than iinWhen the current starts to flow reversely through the second switch tube S2To ensure a buffer capacitor CS1、CS2Charging and discharging are continued in the next cycle, so that the second switch tube S2Before turning off, when the second diode D is positiveoThe current goes to zero and the diode turns off under ZVZCS conditions.
The output voltage V of the load side0The expression of (a) is:
wherein B is the voltage gain of the converter, D is the duty ratio, n is the turn ratio, and VgIs a dc supply voltage.
The invention has the following beneficial effects:
aiming at the defects of relatively more active elements, low efficiency and the like of the traditional high-gain DC-DC circuit, the invention can realize arbitrary double regulation of voltage gain through the direct duty ratio and the turn ratio of the coupling inductor, avoid the limit duty ratio of a switching tube during high voltage gain and ensure the overall safety of the converter; the active elements realize soft switching, namely all active devices work in a soft switching environment, so that the efficiency of the converter is improved; the passive elements are relatively few, so that the efficiency and the power density of the converter are further improved; under the action of the active clamping circuit, the efficiency and the electromagnetic interference are improved, and the working reliability of the circuit is improved; the novel power supply has the advantages of simple structure, convenience in use, low design cost, reliable electrical principle and high output efficiency, and can reach the overall efficiency of 96.92%.
Drawings
Fig. 1 is a schematic view of the structural principle of the present invention.
Fig. 2 is a schematic diagram of two switching tube control signals according to the present invention.
Fig. 3 is a schematic diagram of the on-state operation of the main power switch tube according to the present invention.
Fig. 4 is a schematic diagram of the off state of the main power switch tube according to the present invention.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a high-efficiency high-gain quasi-Z source soft switching DC-DC converter includes a DC power supply VgEnergy storage inductor L1The clamping unit, the coupling inductance unit and the load side;
the DC power supply VgFor an energy-storing inductor L1Providing energy;
the clamping unit clamps a voltage peak generated by the leakage inductance of the coupling inductor unit to a fixed value and transfers energy to a load side;
the coupling inductance unit utilizes the charging and discharging of the coupling inductance to adjust the duty ratio D and the turn ratio n, so as to realize high-voltage conversion.
In one embodiment, the clamping unit comprises a first switch tube S1And its anti-parallel diode DS1And a buffer capacitor CS1A second switch tube S2And its anti-parallel diode DS2And a buffer capacitor CS2A first capacitor C1And a second capacitor C2；
The coupling inductance unit comprises a first winding L of a coupling inductance2aA second winding L2bA third capacitor C3And a first diode D1；
The load side comprises a second diode DoAn output capacitor CoAnd a load R;
the working principle of the invention is as follows:
energy storage inductor L1And a first winding L of a coupling inductor2aThe current difference and the current sum between the first switch tube S1And a second switching tube S2The parallel buffer capacitors are fully charged and discharged and are controlled by dead time, so that the first diode D1And a second diode DoOperating in a Zero Voltage Switching (ZVS) environment;
a first winding L of the coupling inductor2aA second winding L2bFor achieving high gain of the circuit;
the clamping unit collects the leakage inductance energy of the coupling inductor and finally transfers the leakage inductance energy to the load side, and lossless absorption of the energy of the clamping capacitor is achieved.
In an embodiment, the energy storage inductor L1One end of (1) and a DC power supply VgConnected to the other end of the first capacitor C of the clamping unit2Negative pole and second switch tube S2The common ends of the cathodes are connected;
in the clamping unit, a first switch tube S1Positive electrode of and a second capacitor C2Is connected to the positive pole of a second capacitor C2And the second switch tube S2Is connected with the negative pole of the second switch tube S2Positive electrode of and first capacitor C1Is connected to the positive pole of a first capacitor C1Negative pole of (2) and first switch tube S1Negative electrode and DC power supply VgIs connected with the negative pole of the first switching tube S1And a second switching tube S2The gate source electrode is used for receiving a control signal of an external main control chip, and the switching of different working states of the circuit is realized by controlling the on or off of the switching tube through the change of the duty ratio;
in the coupling inductance unit, the first winding and the second winding are dotted terminals, and the turn ratio is 1: n, the first winding L2aA second winding L2bConnected in series with a third capacitor and then connected with a first diode D1Parallel, first winding L2aPositive electrode and first diode D1Common terminal of cathode and first capacitor C1Positive and second switch tube S2The common terminal of the positive electrodes is connected, and a first winding L2aNegative pole and third capacitor C3The common terminal of the negative electrode and the first switch tube S1Positive electrode and second capacitor C2The common terminal of the positive electrodes are connected, and a second winding L2bCathode and first diode D1Second diode D of anode common terminal and output sideoThe cathodes are connected to transfer energy to the load side;
in the load side, an output capacitor CoConnected in parallel with the load R and then connected with a second diode DoAre connected in series.
In one embodiment, the first switch tube S1A second switch tube S2The MOS tubes with N channels are adopted, and the grid and the source electrodes of the MOS tubes can receive control signals of an external main control chip.
In the embodiment, the first switch tube S is controlled by adopting a unipolar PWM control method1And a second switching tube S2The on-state or the off-state is achieved, the working efficiency of the switch tube can be improved, the switching loss is reduced, and therefore the working efficiency of the whole circuit is improved.
The schematic diagram of the two switching tube control signals is shown in fig. 2, and a unipolar PWM control method is adopted to control the switching tubes to be in an on state or an off state. The buffer capacitor C of the switch tube is controlled by the dead timeS1、CS2And the switch tube can be fully charged and discharged, so that the switch tube can work in a Zero Voltage Switching (ZVS) environment.
There are mainly 2 modes of operation of the converter during a steady state duty cycle.
The working state in the through state is schematically shown in FIG. 3, since the first switch tube S1Has been turned on, and then to the first switching tube S1The gate of the first switch tube S is applied with a conducting signal1Zero Voltage (ZVS) is on.
In this state, the first switch tube S1Conducting the second switch tube S2Off, the first diode D1On, the second diode DoDifference V between the output voltage and the first capacitoro-VC1Reverse biasing; first and second capacitors C1、C2Discharging; exciting inductor current i of first winding of coupling inductorLmDecreases to zero and then increases in the reverse direction to positive; leakage inductance L of second winding of coupling inductor2kAnd a capacitor C1Always resonant, current iin、iLmThe sum of the resonant current flows through the first switch tube S1(ii) a When the resonant current drops to zero, the first diode D1Shut down under ZVZCS conditions.
FIG. 4 shows a schematic view of the working state when the switch is turned off, wherein the first switch tube S1Off, the second switching tube S2On, the second diode DoStarting to conduct under ZVZCS condition, the first diode D1Difference V between the output voltage and the first capacitoro-VC1Reverse bias, first capacitor C1Charging at all times, input voltage VgAnd a third capacitance C3Excitation inductor and energy storage inductor L which are both a first winding of a coupling inductor1Second winding L of coupled inductor2bAnd the load side supplies energy, and the excitation inductor of the first winding of the coupling inductor is a second capacitor C2Charging, exciting current iLmDecreases until zero, at which time the input voltage VgAnd a second and a third capacitor C2、C3Together being an energy-storing inductor L1Second winding L of coupled inductor2bAnd a second capacitor C for supplying energy to the load side2Reversely charging the exciting inductor of the first winding of the coupling inductor by exciting current iLmAnd increases in the opposite direction. When going negative iLmIs greater than iinWhen the current starts to flow reversely through the second switch tube S2To ensure a buffer capacitor CS1、CS2Charging and discharging are continued in the next cycle, so that the second switch tube S2Before turning off, when the second diode D is positiveoThe current goes to zero and the diode turns off under ZVZCS conditions.
In the embodiment, the energy storage inductor is utilizedL1First and second windings L of coupled inductor2a、L2bThe inductance voltage-second balance rule to obtain the output voltage V0The expression of (a) is:
wherein B is the voltage gain of the converter, D is the duty ratio, n is the turn ratio, and VgIs a dc supply voltage.
Because the converter increases the degree of freedom of turn ratio n, when the turn ratio is 2 and the duty ratio is 0.3, the gain B can reach 9.5 times, the existence of the limit duty ratio of a switching tube during high-voltage gain is avoided, and the overall safety of the converter is ensured.
Experiments are carried out under the requirements of 380V output voltage and 200W output power, the switching tubes are conducted at Zero Voltage (ZVS), the diodes achieve soft switching (ZVZCS), and the efficiency can reach 96.92%.
The analysis and experiment results show that the direct current converter has high boosting capacity, the soft switching function of an active device is realized, the efficiency of the converter is improved, all index parameters meet the design purpose requirement, and the expected invention effect is achieved.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (8)
1. A high-efficiency high-gain quasi-Z source soft switch DC-DC converter is characterized by comprising a DC power supply VgEnergy storage electricityFeeling L1The clamping unit, the coupling inductance unit and the load side;
the DC power supply VgFor an energy-storing inductor L1Providing energy;
the clamping unit clamps a voltage peak generated by the leakage inductance of the coupling inductor unit to a fixed value and transfers energy to a load side;
the coupling inductance unit utilizes the charging and discharging of the coupling inductance to adjust the duty ratio D and the turn ratio n, so as to realize high-voltage conversion.
2. A high efficiency high gain quasi-Z source soft switching DC-DC converter as claimed in claim 1, wherein said clamping unit includes a first switch tube S1And its anti-parallel diode DS1And a buffer capacitor CS1A second switch tube S2And its anti-parallel diode DS2And a buffer capacitor CS2A first capacitor C1And a second capacitor C2；
The coupling inductance unit comprises a first winding L of a coupling inductance2aA second winding L2bA third capacitor C3And a first diode D1；
The load side comprises a second diode DoAn output capacitor CoAnd a load R;
the energy storage inductor L1And a first winding L of a coupling inductor2aThe current difference and the current sum between the first switch tube S1And a second switching tube S2The parallel buffer capacitors are fully charged and discharged and are controlled by dead time, so that the first diode D1And a second diode DoWorking in a zero voltage switching environment;
a first winding L of the coupling inductor2aA second winding L2bFor achieving high gain of the circuit;
the clamping unit collects the leakage inductance energy of the coupling inductor and finally transfers the leakage inductance energy to the load side, and lossless absorption of the energy of the clamping capacitor is achieved.
3. A high efficiency high gain quasi-Z source soft switching DC-DC converter as claimed in claim 2, wherein said energy storage inductor L1One end of (1) and a DC power supply VgConnected to the other end of the first capacitor C of the clamping unit2Negative pole and second switch tube S2The common ends of the cathodes are connected;
in the clamping unit, a first switch tube S1Positive electrode of and a second capacitor C2Is connected to the positive pole of a second capacitor C2And the second switch tube S2Is connected with the negative pole of the second switch tube S2Positive electrode of and first capacitor C1Is connected to the positive pole of a first capacitor C1Negative pole of (2) and first switch tube S1Negative electrode and DC power supply VgIs connected with the negative pole of the first switching tube S1And a second switching tube S2The gate source electrode is used for receiving a control signal of an external main control chip, and the switching of different working states of the circuit is realized by controlling the on or off of the switching tube through the change of the duty ratio;
in the coupling inductance unit, the first winding and the second winding are dotted terminals, and the turn ratio is 1: n, the first winding L2aA second winding L2bConnected in series with a third capacitor and then connected with a first diode D1Parallel, first winding L2aPositive electrode and first diode D1Common terminal of cathode and first capacitor C1Positive and second switch tube S2The common terminal of the positive electrodes is connected, and a first winding L2aNegative pole and third capacitor C3The common terminal of the negative electrode and the first switch tube S1Positive electrode and second capacitor C2The common terminal of the positive electrodes are connected, and a second winding L2bCathode and first diode D1Second diode D of anode common terminal and output sideoThe cathodes are connected to transfer energy to the load side;
in the load side, an output capacitor CoConnected in parallel with the load R and then connected with a second diode DoAre connected in series.
4. A high efficiency high gain quasi-Z source soft switching DC-DC converter as claimed in claim 3,
the first switch tube S1A second switch tube S2The MOS tubes with N channels are adopted, and the grid and the source electrodes of the MOS tubes can receive control signals of an external main control chip.
5. A high-efficiency high-gain quasi-Z-source soft-switching DC-DC converter as claimed in claim 3, characterized in that the first switch tube S is controlled by a unipolar PWM control method1A second switch tube S2The on-state or the off-state is achieved, the working efficiency of the switch tube can be improved, the switching loss is reduced, and therefore the working efficiency of the whole circuit is improved.
6. A high-efficiency high-gain quasi-Z-source soft-switching DC-DC converter as claimed in claim 3, wherein the first switch tube S is in the through state of the DC-DC converter1Conducting the second switch tube S2Off, the first diode D1On, the second diode DoDifference V between the output voltage and the first capacitoro-VC1Reverse biasing; first and second capacitors C1、C2Discharging; exciting inductor current i of first winding of coupling inductorLmDecreases to zero and then increases in the reverse direction to positive; leakage inductance L of second winding of coupling inductor2kAnd a capacitor C1Always resonant, current iin、iLmThe sum of the resonant current flows through the first switch tube S1(ii) a When the resonant current drops to zero, the first diode D1Shut down under ZVZCS conditions.
7. A high efficiency high gain quasi-Z source soft switching DC-DC converter as claimed in claim 3, wherein when the DC-DC converter is in OFF state, the first switch tube S1Off, the second switching tube S2On, the second diode DoStarting to conduct under ZVZCS condition, the first diode D1Difference V between the output voltage and the first capacitoro-VC1Reverse bias, first capacitor C1Charging at all times, input voltage VgAnd thirdCapacitor C3Excitation inductor and energy storage inductor L which are both a first winding of a coupling inductor1Second winding L of coupled inductor2bAnd the load side supplies energy, and the excitation inductor of the first winding of the coupling inductor is a second capacitor C2Charging, exciting current iLmDecreases until zero, at which time the input voltage VgAnd a second and a third capacitor C2、C3Together being an energy-storing inductor L1Second winding L of coupled inductor2bAnd a second capacitor C for supplying energy to the load side2Reversely charging the exciting inductor of the first winding of the coupling inductor by exciting current iLmAnd increases in the opposite direction. When going negative iLmIs greater than iinWhen the current starts to flow reversely through the second switch tube S2To ensure a buffer capacitor CS1、CS2Charging and discharging are continued in the next cycle, so that the second switch tube S2Before turning off, when the second diode D is positiveoThe current goes to zero and the diode turns off under ZVZCS conditions.
8. A high efficiency high gain quasi-Z source soft switching DC-DC converter as claimed in claim 3, wherein the output voltage V on the load side is0The expression of (a) is:
wherein B is the voltage gain of the converter, D is the duty ratio, n is the turn ratio, and VgIs a dc supply voltage.
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Effective date of registration: 20231027 Address after: Room 1806, Building 01, Xincheng Science and Technology Building, No. 69 Aoti Street, Jianye District, Nanjing City, Jiangsu Province, 210000 Patentee after: Nanjing Saige Miller Electric Co.,Ltd. Address before: 210044 No. 219 Ning six road, Jiangbei new district, Nanjing, Jiangsu Patentee before: Nanjing University of Information Science and Technology |