CN108667310B - High-gain high-power-density converter and high-low-voltage side current conversion method thereof - Google Patents

High-gain high-power-density converter and high-low-voltage side current conversion method thereof Download PDF

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Publication number
CN108667310B
CN108667310B CN201810811447.5A CN201810811447A CN108667310B CN 108667310 B CN108667310 B CN 108667310B CN 201810811447 A CN201810811447 A CN 201810811447A CN 108667310 B CN108667310 B CN 108667310B
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voltage
voltage side
low
switch tube
power switch
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CN108667310A (en
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桂存兵
骆雪汇
陈果
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Guangzhou Institute of Technology
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Guangzhou Institute of Technology
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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a high-gain high-power density converter and a high-low voltage side current conversion method thereof, wherein the high-gain high-power density converter comprises a first group of coupling inductors, a second group of coupling inductors, a converter low-voltage side circuit and a converter high-voltage side circuit, the high-gain high-power density converter can realize zero voltage turn-off and zero current turn-on of all power switching tubes, is similar to zero voltage turn-on, shares secondary windings in forward and reverse charging and discharging processes of the high-voltage side, adopts a controllable power switching tube to replace a forward and reverse charging diode, and flexibly controls the output voltage by controlling the duty ratio of the controllable power switching tube, thereby widening the control range and flexibility of the load output voltage; the circuit device is reduced, the structure is simplified, the power density and the reliability are improved, and the cost is reduced.

Description

High-gain high-power-density converter and high-low-voltage side current conversion method thereof
Technical Field
The invention relates to the field of converters, in particular to a high-gain high-power-density converter and a high-low-voltage side conversion method thereof.
Background
The high-gain direct current converter in recent years has made many developments in the aspects of improving the power density and the gain and soft switching, the soft switching is basically realized by adopting an active clamping circuit or a passive clamping circuit, but the number of switching tubes used is more in general, the structure is complex, the current stress of the power switching tube is larger, the problem of overlarge resonant capacitance current exists in the resonant topology realization soft switching topology, the current primary power switching tube can be switched on or switched off at zero voltage through the active clamping circuit or the passive clamping circuit, but the zero current is not switched on, and the corresponding auxiliary branch switching tube is switched on after the corresponding main power switching tube is switched off; the method has the advantages that the expansion of the gain of the transformer is realized by using the switch capacitor, the method has instant current impact, the number of the switch capacitors required for realizing very high voltage output is large, the structure is complex, the expansion of the gain of the transformer is realized by adopting a three-winding coupling inductance method, the problem of reverse recovery of an output diode is solved, the realization of the coupling inductance process of the method is complex, the industrial production is not facilitated, the adjustment of the voltage gain is mainly realized by means of the change of the duty ratio of a primary power tube and the change of the turn ratio of the transformer or the coupling inductance, the voltage adjustment range is not wide, and the flexibility is not high.
Disclosure of Invention
The invention aims to provide a high-gain high-power-density converter and a high-low voltage side commutation method thereof, wherein the high-gain high-power-density converter can realize zero voltage turn-off and zero current turn-on of all power switching tubes, which are similar to zero voltage turn-on, and share secondary windings in the forward and reverse charging and discharging processes of the high-voltage side, and the controllable power switching tubes are adopted to replace forward and reverse charging diodes, so that the magnitude of output voltage is flexibly controlled by controlling the duty ratio of the controllable power switching tubes, and the control range and flexibility of load output voltage are widened; the circuit device is reduced, the structure is simplified, the power density and the reliability are improved, and the cost is reduced.
The technical scheme is as follows:
the high-gain high-power density converter comprises a first group of coupling inductors, a second group of coupling inductors, a converter low-voltage side circuit and a converter high-voltage side circuit, wherein the first group of coupling inductors comprise a first low-voltage side winding and a first high-voltage side winding, and the second group of coupling inductors comprise a second low-voltage side winding and a second high-voltage side winding; the converter low-voltage side circuit comprises a first quasi-resonant soft switching circuit, a second quasi-resonant soft switching circuit, a first low-voltage branch, a second low-voltage branch and a low-voltage power supply, wherein homonymous ends of the first low-voltage side winding and the second low-voltage side winding are respectively connected with a positive electrode of the low-voltage power supply;
the non-homonymous end of the first low-voltage side winding is respectively connected with one end of the first low-voltage branch and one end of the first quasi-resonant soft switching circuit, and the non-homonymous end of the second low-voltage side winding is respectively connected with one end of the second low-voltage branch and one end of the second quasi-resonant soft switching circuit; the other ends of the first low-voltage branch, the second low-voltage branch, the first quasi-resonance soft switching circuit and the second quasi-resonance soft switching circuit are respectively connected with the negative electrode of the low-voltage power supply;
the high-voltage side circuit of the converter comprises a first voltage-multiplying capacitor, a second voltage-multiplying capacitor, a first high-voltage side power switch tube, a second high-voltage side power switch tube, a first capacitor, a second capacitor, a first output port, a second output port and a third output port, wherein the homonymous end of a first high-voltage side winding is connected with the homonymous end of a second high-voltage side winding, the non-homonymous end of the first high-voltage side winding is respectively connected with one ends of the first voltage-multiplying capacitor and the second voltage-multiplying capacitor, the other end of the first voltage-multiplying capacitor is respectively connected with the drain electrode of the first high-voltage side power switch tube and the positive electrode of the first high-voltage side diode, and the other end of the second voltage-multiplying capacitor is respectively connected with the source electrode of the second high-voltage side power switch tube and the negative electrode of the second high-voltage side diode;
the non-homonymous end of the second high-voltage side winding is respectively connected with the source electrode of the first high-voltage side power switch tube, the drain electrode of the second high-voltage side power switch tube and the third output port; the first capacitor and the second capacitor are respectively connected with the drain and the source of the first high-voltage side power switch tube and the drain and the source of the second high-voltage side power switch tube in parallel.
The first low-voltage branch circuit comprises a first resonant inductor, a first diode and a first low-voltage side power switch tube, one end of the first resonant inductor is connected with a non-homonymous end of the first low-voltage side winding in series, the other end of the first resonant inductor is connected with a drain electrode of the first low-voltage side power switch tube, a source electrode of the first low-voltage side power switch tube is connected with a negative electrode of the low-voltage power supply, and the first diode is connected with the first low-voltage side power switch tube in anti-parallel.
The second low-voltage branch circuit comprises a second resonant inductor, a second diode and a second low-voltage side power switch tube, one end of the second resonant inductor is connected with a non-homonymous end of the second low-voltage side winding in series, the other end of the second resonant inductor is connected with a drain electrode of the second low-voltage side power switch tube, a source electrode of the first low-voltage side power switch tube is connected with a negative electrode of the low-voltage power supply, and the second diode is connected with the second low-voltage side power switch tube in anti-parallel.
The first quasi-resonant soft switching circuit comprises a first resonant capacitor, a first auxiliary switching tube, a third diode and a fourth diode, one end of the first resonant capacitor is connected with a non-homonymous end of the first low-voltage side winding, the other end of the first resonant capacitor is connected with a drain electrode of the first auxiliary switching tube and a cathode of the third diode, a source electrode of the first auxiliary switching tube is connected with an anode of the fourth diode, and anodes of the third diode and cathodes of the fourth diode are respectively connected with a cathode of the low-voltage power supply.
The second quasi-resonant soft switching circuit comprises a second resonant capacitor, a second auxiliary switching tube and a fifth diode, one end of the second resonant capacitor is connected with a non-homonymous end of the second low-voltage side winding, the other end of the second resonant capacitor is connected with a drain electrode of the second auxiliary switching tube and a cathode of the fifth diode, a source electrode of the second auxiliary switching tube is connected with an anode of the fourth diode, and an anode of the fifth diode is connected with a cathode of the low-voltage power supply.
The high-voltage side circuit of the converter further comprises a first high-voltage side diode, wherein the positive electrode of the first high-voltage side diode is connected with the drain electrode of the first high-voltage side power switch tube and the first voltage doubling capacitor respectively, and the negative electrode of the first high-voltage side diode is connected with the first output port.
The high-voltage side circuit of the converter further comprises a second high-voltage side diode, the negative electrode of the second high-voltage side diode is connected with the source electrode of the second high-voltage side power switch tube and the second voltage doubling capacitor respectively, and the positive electrode of the second high-voltage side diode is connected with the second output port.
The high-voltage side circuit of the converter further comprises a first high-voltage side capacitor and a second high-voltage side capacitor, wherein the positive electrode of the first high-voltage side capacitor is connected with the first output port, and the negative electrode of the first high-voltage side capacitor is connected with the third output port; and the negative electrode of the first high-voltage side capacitor and the positive electrode of the second high-voltage side capacitor are respectively connected with the third output port.
The low-voltage side current conversion method of the high-gain high-power density converter comprises the following steps of:
at t 0 At moment, the first low-voltage side power switch tube is conducted, and the first resonant inductorThe current rises from zero, the first low-voltage side power switch tube is conducted with zero current, meanwhile, the first resonant capacitor, the first low-voltage side power switch tube, the first resonant inductor and the first diode form a resonant loop, the first resonant capacitor begins to discharge, the voltage value of the first resonant capacitor gradually decreases, and the resonant current on the first resonant capacitor begins to decrease to t after increasing from zero to peak value 1 The time attenuation is zero;
at t 2 When the first auxiliary switch tube is turned on, the first auxiliary switch tube is turned on with zero current, and the first auxiliary switch tube, the first resonant capacitor, the first low-voltage side power switch tube, the first resonant inductor and the first diode form a resonant loop, and the current discharge on the first resonant inductor is reduced to t 3 The time attenuation is zero, and the first diode is about to be conducted;
at t 3 When the first diode is turned on, the current on the first resonant inductor starts to reverse to t 4 The moment of time is re-oscillated to zero, the voltage on the first resonance capacitor continuously rises in the oscillation process, and at t 4 Turning off the first low-voltage side power switch tube at moment, and turning off zero voltage;
the first low-voltage side power switch tube is at t 4 After the moment is closed, resonance between the first resonance capacitor and the first resonance inductor is interrupted, the first resonance capacitor is charged through the first auxiliary switching tube and the fourth diode loop under the action of the current of the first resonance inductor, and at t 5 Charging to the low-voltage side power supply voltage value at any time; t is t 5 After the moment, the first auxiliary switching tube is turned off, and the zero voltage is turned off.
The high-voltage side current conversion method of the high-gain high-power density converter comprises the following steps of:
when the first low-voltage side power switch tube is turned off, the voltage of an equivalent winding of the first high-voltage side winding and the second high-voltage side winding which are connected in series is positive, at the moment, a driving signal is added to the first high-voltage side power switch tube to drive the first high-voltage side power switch tube to be turned on, zero current of the first high-voltage side power switch tube is turned on, and the first high-voltage side power switch tube is turned on close to zero voltage;
when the second low-voltage side power switch tube is turned off, the voltage of the equivalent winding of the first high-voltage side winding and the voltage of the equivalent winding of the second high-voltage side winding which are connected in series are negative, at the moment, a driving signal is added to the second high-voltage side power switch tube to drive the second high-voltage side power switch tube to be turned on, and the second high-voltage side power switch tube is turned on at zero current and is close to zero voltage.
It should be noted that:
the foregoing "first and second …" do not represent a specific number or order, but are merely for distinguishing between names.
The aforementioned "t 0 、t 1 、t 2 、t 3 、t 4 、t 5 "means a sequential time point from the zeroth time point to the fifth time point.
The advantages and principles of the invention are described below:
1. the high-gain high-power density converter comprises a first group of coupling inductors, a second group of coupling inductors, a converter low-voltage side circuit and a converter high-voltage side circuit, wherein the converter low-voltage side circuit adopts a first quasi-resonance soft switching circuit and a second quasi-resonance soft switching circuit which are respectively advanced to be switched on before the main power switching tubes corresponding to a first low-voltage branch and a second low-voltage branch are switched off, so that the main power switching tubes of the first low-voltage branch and the second low-voltage branch can realize zero-voltage switching-off and zero-current switching-on, the zero-voltage switching-on is approximate to zero-voltage switching-on, and the auxiliary power switching tubes on the low-voltage side of the quasi-resonance soft switching circuit can also realize zero-current switching-on and zero-voltage switching-off; therefore, the switching loss of the power device can be reduced, the efficiency and the power density are improved, the cost is reduced, and the reliability is improved;
the first high-voltage side winding and the first low-voltage side winding are both two windings in the first group of coupling inductors; the second high-voltage side winding and the second low-voltage side winding are both two windings in the second group of coupling inductors; in the forward and reverse charging and discharging processes of the high-voltage side circuit of the converter, as the secondary winding is shared, a three-winding structure is avoided, the turn ratio of the coupling inductor can be greatly reduced under the condition of obtaining the same gain, the magnetic core volume can be greatly reduced, the realization of the industrial process is facilitated, the voltage stress of the output diode and the capacitor is theoretically reduced by half, the reverse recovery loss is further reduced, and the system efficiency, the power density and the reliability are improved;
the controllable power switching tube is adopted to replace a forward and reverse charging diode, and the size of the output voltage is flexibly controlled by controlling the duty ratio of the controllable power switching tube, so that the control range and flexibility of the load output voltage are widened, the duty ratios of the two paths of switching tubes can be respectively controlled to obtain different two paths of output direct current voltages, the duty ratios can be flexibly adjusted according to the respective load sizes, and when the duty ratios are different, the natural voltage sharing can be realized without considering the voltage sharing control problem; the commutation process of the high side circuit is as follows:
when the first low-voltage side power switch tube is turned off, the voltage of an equivalent winding formed by connecting the first high-voltage side winding and the second high-voltage side winding in series is positive, a driving signal is added to the first high-voltage side power switch tube to drive the first high-voltage side power switch tube to be turned on, the first high-voltage side power switch tube can be turned on with zero current due to the existence of the series winding, the first high-voltage side power switch tube can be turned on with zero voltage approximately, the voltage of the first voltage doubling capacitor is changed by controlling the duty ratio of the driving signal, and the reverse recovery problem when the first high-voltage side power switch tube is turned off can be well solved due to the existence of the series winding;
when the second low-voltage side power switch tube is turned off, the voltage of an equivalent winding formed by connecting the first high-voltage side winding and the second high-voltage side winding in series is negative, a driving signal is added to the second high-voltage side power switch tube to drive the second high-voltage side power switch tube to be turned on, the second high-voltage side power switch tube can be turned on with zero current due to the existence of the series winding, the second high-voltage side power switch tube can be turned on with zero voltage approximately, the voltage of the second voltage doubling capacitor is changed by controlling the duty ratio of the driving signal, and the reverse recovery problem when the second high-voltage side power switch tube is turned off can be well solved due to the existence of the series winding;
the duty ratio of the driving signal of the first high-voltage side power switch tube and the duty ratio of the driving signal of the second high-voltage side power switch tube can be the same, and can also be different according to the difference of two paths of loads, so that natural voltage sharing can be realized, and voltage sharing measures are not needed to be considered when the loads or the duty ratios are different;
the high-gain high-power density converter can realize zero-voltage turn-off and close to zero-voltage turn-on of all power switching tubes, is similar to zero-current turn-on, shares secondary windings in the forward and reverse charging and discharging processes of the high-voltage side, adopts a controllable power switching tube to replace a forward and reverse charging diode, and flexibly controls the output voltage by controlling the duty ratio of the controllable power switching tube, thereby widening the control range and flexibility of the load output voltage; the circuit device is reduced, the structure is simplified, the power density and the reliability are improved, and the cost is reduced.
2. The first low-voltage branch circuit comprises a first resonant inductor, a first diode and a first low-voltage side power switch tube, and when the low-voltage branch circuit is used, the current conversion process of the first low-voltage branch circuit is as follows:
t 0 the first low-voltage side power switch tube is conducted at the moment, and then under the cooperation of a quasi-resonant circuit, t 4 -t 5 And the valve is turned off.
3. The second low-voltage branch circuit comprises a second resonant inductor, a second diode and a second low-voltage side power switch tube, and the current conversion process of the second low-voltage branch circuit is similar to that of the first low-voltage branch circuit.
4. The first quasi-resonant soft switching circuit comprises a first resonant capacitor, a first auxiliary switching tube, a third diode and a fourth diode, and when the quasi-resonant soft switching circuit is used, the conversion process of the first quasi-resonant soft switching circuit and the first low-voltage branch circuit is as follows:
at t 0 At moment, the first low-voltage side power switch tube is conducted, the first resonant inductor current rises from zero, the first low-voltage side power switch tube is conducted in zero current, meanwhile, the first resonant capacitor, the first low-voltage side power switch tube, the first resonant inductor and the first diode form a resonant loop, the first resonant capacitor begins to discharge, the voltage value of the first resonant capacitor is gradually reduced, and the resonant current on the first resonant capacitor begins to fall to t after increasing from zero to peak value 1 The time attenuation is zero;
at t 2 When the first auxiliary switch tube is turned on, the first resonant capacitor and the first auxiliary switch tube are turned on, and the first auxiliary switch tube is turned offThe first low-voltage side power switch tube, the first resonant inductor and the fourth diode form a resonant loop, and the current discharge on the first resonant inductor is reduced to t 3 The time attenuation is zero, and the anti-parallel first diode is about to be conducted;
at t 3 When the anti-parallel first diode is turned on, the current on the first resonant inductor starts to reverse to t 4 The moment of time is re-oscillated to zero, the voltage on the first resonance capacitor continuously rises in the oscillation process, and at t 4 The first low-voltage side power switch tube is turned off at any time, so that zero-voltage turn-off can be realized;
the first low-voltage side power switch tube is at t 4 After the moment is closed, resonance between the first resonance capacitor and the first resonance inductor is interrupted, and the first resonance capacitor is charged through the first auxiliary switch tube and the fourth diode loop under the action of the current of the first resonance inductor, and at t 5 Charging to the low-voltage side power supply voltage value at any time; t is t 5 After the moment, the first auxiliary switching tube is turned off, and zero-voltage turn-off can be realized.
5. The second quasi-resonant soft switching circuit comprises a second resonant capacitor, a second auxiliary switching tube and a fifth diode, and the commutation process of the second quasi-resonant soft switching circuit and the second low-voltage branch is similar to that of the first quasi-resonant soft switching circuit and the first low-voltage branch.
6. The converter high side circuit further includes a first high side diode that improves output stability of the first output port.
7. The converter high side circuit further includes a second high side diode that improves output stability of the second output port.
8. The high-voltage side circuit of the converter further comprises a first high-voltage side capacitor and a second high-voltage side capacitor, wherein the first high-voltage side capacitor enables output between the first output port and the third output port to be stable and reliable, and the second high-voltage side capacitor enables output between the second output port and the third output port to be stable and reliable.
Drawings
FIG. 1 is a schematic diagram of a low-side circuit of a high-gain high-power density converter according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a high-gain high-power density converter high-voltage side circuit according to an embodiment of the invention.
FIG. 3 is a schematic diagram of a low-side commutation process of a high-gain high-power density converter according to an embodiment of the present invention.
Reference numerals illustrate:
10. a first set of coupling inductances, 11, a first low-side winding, 12, a first high-side winding, 20, a second set of coupling inductances, 21, a second low-side winding, 22, a second high-side winding, 30, a converter low-side circuit, 31, a first quasi-resonant soft switching circuit, 311, a first resonant capacitance, 312, a first auxiliary switching tube, 313, a third diode, 314, a fourth diode, 32, a second quasi-resonant soft switching circuit, 321, a second resonant capacitance, 322, a second auxiliary switching tube, 323, a fifth diode, 33, a first low-voltage branch, 331, a first resonant inductance, 332, a first diode, 333, a first low-side power switching tube, 34, second low-voltage branch, 341, second resonant inductance, 342, second diode, 343, second low-voltage side power switch tube, 35, low-voltage power supply, 40, converter high-voltage side circuit, 41, first voltage-doubling capacitor, 42, second voltage-doubling capacitor, 43, first high-voltage side power switch tube, 44, second high-voltage side power switch tube, 45, first capacitor, 46, second capacitor, 471, first output port, 472, second output port, 473, third output port, 481, first high-voltage side diode, 482, second high-voltage side diode, 491, first high-voltage side capacitor, 492, second high-voltage side capacitor.
Detailed Description
The following describes embodiments of the present invention in detail.
As shown in fig. 1 and 2, the high-gain high-power density converter comprises a first group of coupling inductors 10, a second group of coupling inductors 20, a converter low-voltage side circuit 30 and a converter high-voltage side circuit 40, wherein the first group of coupling inductors 10 comprises a first low-voltage side winding 11 and a first high-voltage side winding 12, and the second group of coupling inductors 20 comprises a second low-voltage side winding 21 and a second high-voltage side winding 22; the low-voltage side circuit 30 of the converter comprises a first quasi-resonant soft switching circuit 31, a second quasi-resonant soft switching circuit 32, a first low-voltage branch circuit 33, a second low-voltage branch circuit 34 and a low-voltage power supply 35, and homonymous ends of the first low-voltage side winding 11 and the second low-voltage side winding 21 are respectively connected with the positive electrode of the low-voltage power supply 35;
the non-homonymous end of the first low-voltage side winding 11 is respectively connected with one end of a first low-voltage branch circuit 33 and one end of a first quasi-resonant soft switching circuit 31, and the non-homonymous end of the second low-voltage side winding 21 is respectively connected with one end of a second low-voltage branch circuit 34 and one end of a second quasi-resonant soft switching circuit 32; the other ends of the first low-voltage branch 33, the second low-voltage branch 34, the first quasi-resonant soft switching circuit 31 and the second quasi-resonant soft switching circuit 32 are respectively connected with the negative electrode of the low-voltage power supply 35;
the converter high-voltage side circuit 40 includes a first voltage-multiplying capacitor 41, a second voltage-multiplying capacitor 42, a first high-voltage side power switch tube 43, a second high-voltage side power switch tube 44, a first capacitor 45, a second capacitor 46, a first output port 471, a second output port 472, and a third output port 473, the homonymous end of the first high-voltage side winding 12 is connected to the homonymous end of the second high-voltage side winding 22, the non-homonymous end of the first high-voltage side winding 12 is connected to one end of the first voltage-multiplying capacitor 41 and one end of the second voltage-multiplying capacitor 42, the other end of the first voltage-multiplying capacitor 41 is connected to the drain electrode of the first high-voltage side power switch tube 43 and the anode of the first high-voltage side diode 481, and the other end of the second voltage-multiplying capacitor 42 is connected to the source electrode of the second high-voltage side power switch tube 44 and the cathode of the second high-voltage side diode 482;
the non-homonymous end of the second high-voltage side winding 22 is respectively connected with the source electrode of the first high-voltage side power switch tube 43, the drain electrode of the second high-voltage side power switch tube 44 and the third output port 473; the first capacitor 45 and the second capacitor 46 are connected in parallel with the drain-source of the first high-side power switching tube 43 and the drain-source of the second high-side power switching tube 44, respectively.
The first low-voltage branch circuit 33 includes a first resonant inductor 331, a first diode 332, and a first low-voltage side power switch tube 333, one end of the first resonant inductor 331 is connected in series with a non-homonymous end of the first low-voltage side winding 11, the other end of the first resonant inductor 331 is connected with a drain electrode of the first low-voltage side power switch tube 333, a source electrode of the first low-voltage side power switch tube 333 is connected with a negative electrode of the low-voltage power supply 35, and the first diode 332 is connected in anti-parallel with the first low-voltage side power switch tube 333;
the second low-voltage branch 34 includes a second resonant inductor 341, a second diode 342, and a second low-voltage side power switch tube 343, one end of the second resonant inductor 341 is connected in series with a non-homonymous end of the second low-voltage side winding 21, the other end of the second resonant inductor 341 is connected with a drain electrode of the second low-voltage side power switch tube 343, a source electrode of the first low-voltage side power switch tube 333 is connected with a negative electrode of the power supply 35, and the second diode 342 is connected in anti-parallel with the second low-voltage side power switch tube 343;
the first quasi-resonant soft switching circuit 31 includes a first resonant capacitor 311, a first auxiliary switching tube 312, a third diode 313, and a fourth diode 314, one end of the first resonant capacitor 311 is connected to the non-identical end of the first low-voltage side winding 11, the other end of the first resonant capacitor 311 is connected to the drain of the first auxiliary switching tube 312 and the negative electrode of the third diode 313, the source of the first auxiliary switching tube 312 is connected to the positive electrode of the fourth diode 314, and the positive electrode of the third diode 313 and the negative electrode of the fourth diode 314 are connected to the negative electrode of the first low-voltage power supply 35, respectively;
the second quasi-resonant soft switching circuit 32 includes a second resonant capacitor 321, a second auxiliary switching tube 322, and a fifth diode 323, wherein one end of the second resonant capacitor 321 is connected to a non-homonymous end of the second low-voltage side winding 21, the other end of the second resonant capacitor 321 is connected to a drain electrode of the second auxiliary switching tube 322 and a negative electrode of the fifth diode 323, a source electrode of the second auxiliary switching tube 322 is connected to an anode of the fourth diode 314, and a positive electrode of the fifth diode 323 is connected to a negative electrode of the second low-voltage power supply 35;
the converter high-voltage side circuit 40 further includes a first high-voltage side diode 481, a second high-voltage side diode 482, a first high-voltage side capacitor 491, and a second high-voltage side capacitor 492, wherein the positive electrode of the first high-voltage side diode 481 is connected to the drain electrode of the first high-voltage side power switching tube 43 and the first voltage-multiplying capacitor 41, respectively, and the negative electrode of the first high-voltage side diode 481 is connected to the first output port 471; the cathode of the second high-voltage side diode 482 is connected to the source of the second high-voltage side power switch 44 and the second voltage-multiplying capacitor 42, respectively, and the anode of the second high-voltage side diode 482 is connected to the second output port 472; the positive electrode of the first high-voltage side capacitor 491 is connected to the first output port 471, and the negative electrode of the first high-voltage side capacitor 491 is connected to the second output port 472; the negative electrode of the first high-side capacitor 491 and the positive electrode of the second high-side capacitor 492 are connected to the third output port 473, respectively.
As shown in fig. 3, the low-voltage side commutation method of the high-gain high-power-density converter comprises the following steps:
at t 0 At this time, the first low-voltage side power switch tube 333 is turned on, the current of the first resonant inductor 331 rises from zero, the first low-voltage side power switch tube 333 is turned on with zero current, the first resonant capacitor 311, the first low-voltage side power switch tube 333, the first resonant inductor 331 and the first diode 332 form a resonant loop, the first resonant capacitor 311 begins to discharge, the voltage value of the first resonant capacitor is gradually reduced, and the resonant current on the first resonant capacitor 311 begins to drop to t after increasing from zero to peak value in the reverse direction 1 The time attenuation is zero;
at t 2 At the moment, a turn-on signal of the first auxiliary switch 312 is given, at the moment, the first auxiliary switch 312 is turned on with zero current, and at the same time, the first auxiliary switch 312, the first resonant capacitor 311, the first low-voltage side power switch 333, the first resonant inductor 331 and the fourth diode 314 form a resonant loop, and the current discharge on the first resonant inductor 331 drops to t 3 The time decay is zero, and the first diode 332 is about to be turned on;
at t 3 When the first diode 332 is turned on, the current on the first resonant inductor 331 starts to reverse to t 4 The moment of time is re-oscillated to zero, the voltage on the first resonant capacitor 311 continues to rise during oscillation, at t 4 The first low-voltage side power switch tube 333 is turned off at the moment, and zero voltage is turned off;
the first low side power switch tube 333 is at t 4 After the time is turned off, resonance between the first resonance capacitor 311 and the first resonance inductor 331 is interrupted, and the first resonance capacitor 311 passes through the first auxiliary switch tube 312 and the fourth diode under the action of the current of the first resonance inductor 331Tube 314 is charged in return, at t 5 Charging to the low-voltage side power supply voltage value at any time; t is t 5 After this time, the first auxiliary switching tube 312 is turned off, and the zero voltage is turned off.
The high-voltage side current conversion method of the high-gain high-power density converter comprises the following steps of:
when the first low-voltage side power switch tube 333 is turned off, the voltage of the equivalent winding of the first high-voltage side winding 12 and the second high-voltage side winding 22 connected in series is positive, at this time, a driving signal is applied to the first high-voltage side power switch tube 43 to drive the first high-voltage side power switch tube 43 to be turned on, the zero current of the first high-voltage side power switch tube 43 is turned on, and the voltage is close to zero;
when the second low-voltage side power switch tube 343 is turned off, the equivalent winding voltage of the first high-voltage side winding 12 and the second high-voltage side winding 22 connected in series is negative, and at this time, a driving signal is applied to the second high-voltage side power switch tube 44 to drive the second high-voltage side power switch tube 44 to be turned on, the second high-voltage side power switch tube 44 is turned on with zero current, and the voltage is close to zero.
This embodiment has the following advantages:
1. the high-gain high-power density converter comprises a first group of coupling inductors 10, a second group of coupling inductors 20, a converter low-voltage side circuit 30 and a converter high-voltage side circuit 40, wherein the converter low-voltage side circuit 30 adopts a first quasi-resonance soft switching circuit 31 and a second quasi-resonance soft switching circuit 32 which are respectively advanced before the main power switching tubes corresponding to a first low-voltage branch circuit 33 and a second low-voltage branch circuit 34 are turned off, so that the main power switching tubes of the first low-voltage branch circuit 33 and the second low-voltage branch circuit 34 can realize zero-voltage turn-off and zero-voltage turn-on, the low-voltage side auxiliary power switching tubes of the quasi-resonance soft switching circuits are similar to zero-current turn-on and zero-voltage turn-off; therefore, the switching loss of the power device can be reduced, the efficiency and the power density are improved, the cost is reduced, and the reliability is improved;
the first high-voltage side winding 12 and the first low-voltage side winding 11 are both windings in the first group of coupled inductors 10; the second high-voltage side winding 22 and the second low-voltage side winding 21 are both two windings in the second set of coupled inductors 20; in the forward and reverse charging and discharging processes of the converter high-voltage side circuit 40, as the secondary winding is shared, a three-winding structure is avoided, the turn ratio of the coupling inductor can be greatly reduced under the condition of obtaining the same gain, the magnetic core volume can be greatly reduced, the realization of the industrial process is facilitated, the voltage stress of the output diode and the capacitor is theoretically reduced by half, the reverse recovery loss is further reduced, and the system efficiency, the power density and the reliability are improved;
the controllable power switching tube is adopted to replace a forward and reverse charging diode, and the size of the output voltage is flexibly controlled by controlling the duty ratio of the controllable power switching tube, so that the control range and flexibility of the load output voltage are widened, the duty ratios of the two paths of switching tubes can be respectively controlled to obtain different two paths of output direct current voltages, the duty ratios can be flexibly adjusted according to the respective load sizes, and when the duty ratios are different, the natural voltage sharing can be realized without considering the voltage sharing control problem; the commutation process of the high side circuit is as follows:
when the first low-voltage side power switch tube 333 is turned off, the voltage of the equivalent winding of the first high-voltage side winding 12 and the second high-voltage side winding 22 connected in series is positive, and at this time, a driving signal is applied to the first high-voltage side power switch tube 43 to drive the first high-voltage side power switch tube to be turned on, because of the existence of the series winding, the first high-voltage side power switch tube 43 can be turned on with zero current, because of the existence of the first capacitor 45, the first high-voltage side power switch tube 43 can be turned on with zero voltage, the voltage of the first voltage-multiplying capacitor 41 is changed by controlling the duty ratio of the driving signal, and because of the existence of the series winding, the reverse recovery problem when the first high-voltage side power switch tube 43 is turned off can be solved well;
when the second low-voltage side power switch tube 343 is turned off, the voltage of the equivalent winding of the first high-voltage side winding 12 and the second high-voltage side winding 22 which are connected in series is negative, a driving signal is added to the second high-voltage side power switch tube 44 to drive the second high-voltage side power switch tube 44 to be turned on, the second high-voltage side power switch tube 44 can be turned on with zero current due to the existence of the series winding, the second high-voltage side power switch tube 44 can be turned on with zero voltage due to the existence of the second capacitor 46, the voltage of the second voltage doubling capacitor 42 is changed by controlling the duty ratio of the driving signal, and the reverse recovery problem when the second high-voltage side power switch tube 44 is turned off can be well solved due to the existence of the series winding;
the duty ratio of the driving signal of the first high-voltage side power switch tube 43 and the duty ratio of the driving signal of the second high-voltage side power switch tube 44 can be the same, or can be different according to the difference of two paths of loads, so that natural voltage sharing can be realized, and voltage sharing measures are not needed to be considered when the loads or the duty ratios are different;
the high-gain high-power density converter can realize zero-voltage turn-off and zero-voltage turn-on of all power switching tubes, is similar to zero-current turn-on, shares secondary windings in the forward and reverse charging and discharging processes of the high-voltage side, adopts a controllable power switching tube to replace a forward and reverse charging diode, and flexibly controls the output voltage by controlling the duty ratio of the controllable power switching tube, thereby widening the control range and flexibility of the load output voltage; the circuit device is reduced, the structure is simplified, the power density and the reliability are improved, and the cost is reduced.
2. The first low-voltage branch 33 includes a first resonant inductor 331, a first diode 332, and a first low-voltage side power switch 333, and when in use, the commutation process of the first low-voltage branch 33 is as follows:
t 0 at time t, the first low-side power switch 333 is turned on 4 To t 5 And the valve is turned off.
3. The second low-voltage branch 34 includes a second resonant inductor 341, a second diode 342, and a second low-voltage side power switch 343, and the commutation process of the second low-voltage branch 34 is similar to that of the first low-voltage branch 33.
4. The first quasi-resonant soft switching circuit 31 includes a first resonant capacitor 311, a first auxiliary switching tube 312, a third diode 313, and a fourth diode 314, and when in use, the switching process of the first quasi-resonant soft switching circuit 31 and the first low-voltage branch 33 is as follows:
at t 0 At this time, the first low-voltage side power switch 333 is turned on, the current of the first resonant inductor 331 rises from zero, the first low-voltage side power switch 333 is turned on with zero current, and the first resonant capacitor 311, the first low-voltage side power switch 333, the first resonant inductor 331 and the first diode 332 form a resonant circuit, the first resonant circuitA resonant capacitor 311 begins to discharge, the voltage value of which gradually decreases, and the resonant current on the first resonant capacitor 311 increases from zero to peak value and then begins to decrease to t 1 The time attenuation is zero;
at t 2 In order to match the turn-off of the first low-voltage side power switch 333, a turn-on signal of the first auxiliary switch 312 is given, at this time, the first auxiliary switch 312 is turned on with zero current, at this time, the first auxiliary switch 312, the first resonant capacitor 311, the first low-voltage side power switch 333, the first resonant inductor 331, and the fourth diode 314 form a resonant circuit, and the current discharge on the first resonant inductor 331 drops to t 3 The time decay is zero, and the anti-parallel first diode 332 is about to be conducted;
at t 3 When the anti-parallel first diode 332 is turned on, the current on the first resonant inductor 331 starts to reverse to t 4 The moment of time is re-oscillated to zero, the voltage on the first resonant capacitor 311 continues to rise during oscillation, at t 4 The first low-voltage side power switch tube 333 is turned off at any time, so that zero-voltage turn-off can be realized;
the first low side power switch tube 333 is at t 4 After the time is turned off, resonance between the first resonance capacitor 311 and the first resonance inductor 331 is interrupted, and the first resonance capacitor 311 is charged through the first auxiliary switch tube 312 and the fourth diode 314 loop under the action of the current of the first resonance inductor 331, at t 5 Charging to the low-voltage side power supply voltage value at any time; t is t 5 After this time, the first auxiliary switching tube 312 is turned off, and zero voltage turn-off can be achieved.
5. The second quasi-resonant soft switching circuit 32 includes a second resonant capacitor 321, a second auxiliary switching tube 322, and a fifth diode 323, and the commutation process of the second quasi-resonant soft switching circuit 32 and the second low-voltage branch 34 is similar to the commutation process of the first quasi-resonant soft switching circuit 31 and the first low-voltage branch 33.
6. The inverter high-side circuit 40 further includes a first high-side diode 481, improving the output stability of the first output port 471.
7. The inverter high side circuit 40 further includes a second high side diode 482 that improves the output stability of the second output port 472.
8. The inverter high-side circuit 40 further includes a first high-side capacitor 491 and a second high-side capacitor 492, the first high-side capacitor 491 making the output between the first output port 471 and the third output port 473 more stable and reliable, the second high-side capacitor 492 making the output between the second output port 472 and the third output port 473 more stable and reliable.
The foregoing is merely exemplary embodiments of the present invention, and is not intended to limit the scope of the present invention; any substitutions and modifications made without departing from the spirit of the invention are within the scope of the invention.

Claims (6)

1. The high-gain high-power density converter is characterized by comprising a first group of coupling inductors, a second group of coupling inductors, a converter low-voltage side circuit and a converter high-voltage side circuit, wherein the first group of coupling inductors comprise a first low-voltage side winding and a first high-voltage side winding, and the second group of coupling inductors comprise a second low-voltage side winding and a second high-voltage side winding; the converter low-voltage side circuit comprises a first quasi-resonant soft switching circuit, a second quasi-resonant soft switching circuit, a first low-voltage branch, a second low-voltage branch and a low-voltage power supply, wherein homonymous ends of the first low-voltage side winding and the second low-voltage side winding are respectively connected with a positive electrode of the low-voltage power supply;
the non-homonymous end of the first low-voltage side winding is respectively connected with one end of the first low-voltage branch and one end of the first quasi-resonant soft switching circuit, and the non-homonymous end of the second low-voltage side winding is respectively connected with one end of the second low-voltage branch and one end of the second quasi-resonant soft switching circuit; the other ends of the first low-voltage branch, the second low-voltage branch, the first quasi-resonance soft switching circuit and the second quasi-resonance soft switching circuit are respectively connected with the negative electrode of the low-voltage power supply;
the high-voltage side circuit of the converter comprises a first voltage-multiplying capacitor, a second voltage-multiplying capacitor, a first high-voltage side power switch tube, a second high-voltage side power switch tube, a first capacitor, a second capacitor, a first output port, a second output port and a third output port, wherein the homonymous end of a first high-voltage side winding is connected with the homonymous end of a second high-voltage side winding, the non-homonymous end of the first high-voltage side winding is respectively connected with one ends of the first voltage-multiplying capacitor and the second voltage-multiplying capacitor, the other end of the first voltage-multiplying capacitor is respectively connected with the drain electrode of the first high-voltage side power switch tube and the positive electrode of the first high-voltage side diode, and the other end of the second voltage-multiplying capacitor is respectively connected with the source electrode of the second high-voltage side power switch tube and the negative electrode of the second high-voltage side diode;
the non-homonymous end of the second high-voltage side winding is respectively connected with the source electrode of the first high-voltage side power switch tube, the drain electrode of the second high-voltage side power switch tube and the third output port; the first capacitor and the second capacitor are respectively connected in parallel with the drain-source electrode of the first high-voltage side power switch tube and the drain-source electrode of the second high-voltage side power switch tube;
the first low-voltage branch circuit comprises a first resonant inductor, a first diode and a first low-voltage side power switch tube, one end of the first resonant inductor is connected in series with a non-homonymous end of the first low-voltage side winding, the other end of the first resonant inductor is connected with a drain electrode of the first low-voltage side power switch tube, a source electrode of the first low-voltage side power switch tube is connected with a negative electrode of the low-voltage power supply, and the first diode is connected with the first low-voltage side power switch tube in an anti-parallel manner;
the second low-voltage branch circuit comprises a second resonant inductor, a second diode and a second low-voltage side power switch tube, one end of the second resonant inductor is connected in series with a non-homonymous end of the second low-voltage side winding, the other end of the second resonant inductor is connected with a drain electrode of the second low-voltage side power switch tube, a source electrode of the first low-voltage side power switch tube is connected with a negative electrode of the low-voltage power supply, and the second diode is connected with the second low-voltage side power switch tube in anti-parallel;
the first quasi-resonant soft switching circuit comprises a first resonant capacitor, a first auxiliary switching tube, a third diode and a fourth diode, one end of the first resonant capacitor is connected with a non-homonymous end of the first low-voltage side winding, the other end of the first resonant capacitor is connected with a drain electrode of the first auxiliary switching tube and a cathode of the third diode, a source electrode of the first auxiliary switching tube is connected with an anode of the fourth diode, and an anode of the third diode and a cathode of the fourth diode are respectively connected with a cathode of the low-voltage power supply;
the second quasi-resonant soft switching circuit comprises a second resonant capacitor, a second auxiliary switching tube and a fifth diode, one end of the second resonant capacitor is connected with a non-homonymous end of the second low-voltage side winding, the other end of the second resonant capacitor is connected with a drain electrode of the second auxiliary switching tube and a cathode of the fifth diode, a source electrode of the second auxiliary switching tube is connected with an anode of the fourth diode, and an anode of the fifth diode is connected with a cathode of the low-voltage power supply.
2. The high-gain high-power-density converter of claim 1 in which said converter high-side circuit further comprises a first high-side diode, an anode of said first high-side diode being connected to a drain of said first high-side power switch tube, a first voltage-multiplying capacitor, respectively, and a cathode of said first high-side diode being connected to said first output port.
3. The high-gain high-power-density converter of claim 2, wherein the converter high-side circuit further comprises a second high-side diode, a negative electrode of the second high-side diode is connected with a source electrode of the second high-side power switch tube and a second voltage-multiplying capacitor, and a positive electrode of the second high-side diode is connected with the second output port.
4. The high-gain high-power-density converter of claim 2, wherein said converter high-side circuit further comprises a first high-side capacitor, a second high-side capacitor, a positive electrode of said first high-side capacitor being connected to said first output port, a negative electrode of said first high-side capacitor being connected to said third output port; and the negative electrode of the first high-voltage side capacitor and the positive electrode of the second high-voltage side capacitor are respectively connected with the third output port.
5. A high gain high power density converter low voltage side commutation method applied to the high gain high power density converter of any one of claims 1 to 4, comprising the steps of:
at t 0 At moment, the first low-voltage side power switch tube is conducted, the first resonant inductor current rises from zero, the first low-voltage side power switch tube is conducted in zero current, meanwhile, the first resonant capacitor, the first low-voltage side power switch tube, the first resonant inductor and the first diode form a resonant loop, the first resonant capacitor begins to discharge, the voltage value of the first resonant capacitor is gradually reduced, and the resonant current on the first resonant capacitor begins to fall to t after increasing from zero to peak value 1 The time attenuation is zero;
at t 2 At moment, a first auxiliary switch tube conduction signal is given, at the moment, the first auxiliary switch tube is turned on with zero current, and meanwhile, the first auxiliary switch tube, the first resonant capacitor, the first low-voltage side power switch tube, the first resonant inductor and the fourth diode form a resonant loop, the current discharge on the first resonant inductor is reduced to t 3 The time attenuation is zero, and the first diode is about to be conducted;
at t 3 At the moment, the first diode is conducted, and the current on the first resonant inductor starts to reverse to t 4 The moment of time is re-oscillated to zero, the voltage on the first resonance capacitor continuously rises in the oscillation process, and at t 4 Turning off the first low-voltage side power switch tube at moment, and turning off zero voltage;
the first low-voltage side power switch tube is at t 4 After the moment is closed, resonance between the first resonance capacitor and the first resonance inductor is interrupted, the first resonance capacitor is charged through the first auxiliary switching tube and the fourth diode loop under the action of the current of the first resonance inductor, and at t 5 Charging to the low-voltage side power supply voltage value at any time; t is t 5 After the moment, the first auxiliary switching tube is turned off, and the zero voltage is turned off.
6. A high-gain high-power-density converter high-voltage side commutation method, characterized in that it is applied to a high-gain high-power-density converter according to any one of claims 1 to 4, comprising the steps of:
when the first low-voltage side power switch tube is turned off, the voltage of an equivalent winding of the first high-voltage side winding and the second high-voltage side winding which are connected in series is positive, at the moment, a driving signal is added to the first high-voltage side power switch tube to drive the first high-voltage side power switch tube to be turned on, zero current of the first high-voltage side power switch tube is turned on, and the first high-voltage side power switch tube is turned on close to zero voltage;
when the second low-voltage side power switch tube is turned off, the voltage of the equivalent winding of the first high-voltage side winding and the voltage of the equivalent winding of the second high-voltage side winding which are connected in series are negative, at the moment, a driving signal is added to the second high-voltage side power switch tube to drive the second high-voltage side power switch tube to be turned on, and the second high-voltage side power switch tube is turned on at zero current and is close to zero voltage.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101702578A (en) * 2009-12-07 2010-05-05 浙江大学 Forward-flyback isolated type boost inverter realized by coupling inductors and application thereof
CN101976953A (en) * 2010-09-17 2011-02-16 浙江大学 Isolated bidirectional DC-DC converter realized by coupling inductor
CN208589925U (en) * 2018-07-23 2019-03-08 广州工程技术职业学院 High-gain and high-power density converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101702578A (en) * 2009-12-07 2010-05-05 浙江大学 Forward-flyback isolated type boost inverter realized by coupling inductors and application thereof
CN101976953A (en) * 2010-09-17 2011-02-16 浙江大学 Isolated bidirectional DC-DC converter realized by coupling inductor
CN208589925U (en) * 2018-07-23 2019-03-08 广州工程技术职业学院 High-gain and high-power density converter

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