CN115603578A - Converter based on soft switch and control method thereof - Google Patents

Converter based on soft switch and control method thereof Download PDF

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Publication number
CN115603578A
CN115603578A CN202211602424.6A CN202211602424A CN115603578A CN 115603578 A CN115603578 A CN 115603578A CN 202211602424 A CN202211602424 A CN 202211602424A CN 115603578 A CN115603578 A CN 115603578A
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inductor
diode
capacitor
resonant
port
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CN115603578B (en
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乐卫平
章兵
乐子毅
黎小平
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Shenzhen CSL Vacuum Science and Technology Co Ltd
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Shenzhen CSL Vacuum Science and Technology Co Ltd
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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
    • H02M3/01—Resonant DC/DC converters
    • 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
    • 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
    • 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)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a converter based on soft switch and a control method thereof, wherein the converter based on the soft switch comprises a power supply, a boosting module and an output module; the boosting module comprises a first boosting module and a second boosting module; the first boosting module comprises a first input unit, a first resonance unit and a first resonance capacitor; the first input unit comprises a first switching tube, the first resonance unit is connected with the first input unit, and the first resonance unit resonates with the first resonance capacitor; the second boosting module comprises a second input unit, a second resonance unit and a second resonance capacitor; the second resonance unit comprises a second resonance inductor, the second input unit is connected with the second resonance inductor, and the second resonance inductor resonates with the second resonance capacitor. The first switch tube and the second switch tube of the converter realize zero current switching-on and zero voltage switching-off, and the switching loss is low.

Description

Converter based on soft switch and control method thereof
Technical Field
The invention belongs to the technical field of converters, and particularly relates to a converter based on soft switching and a control method thereof.
Background
In a new energy power generation system, a renewable energy power generation unit such as a fuel cell, a photovoltaic cell, or a storage battery outputs a low direct current and has a wide variation range. Therefore, a distributed renewable energy grid-connected power generation system generally adopts a two-stage structure of a direct-current boost converter cascade voltage type inverter. The Boost converter is the most widely applied direct current Boost converter at present, the input current is continuous, the structure is simple, various high-Boost direct current converters such as a switched capacitor Boost converter are derived from the Boost converter, the input current is continuous, the voltage gain is (1 + D) times of that of the traditional Boost converter, and the voltage stress of a power tube is half of the sum of the input voltage Uin and the output voltage UO, namely (UO + Uin)/2, which is far lower than that of the traditional Boost converter.
The switching-on processes of the switching tubes in the Boost converter and the switching capacitor Boost converter are in hard switching-on and hard switching-off states, which is not beneficial to reducing switching loss and limits the working frequency of a power device.
Disclosure of Invention
The invention provides a converter based on soft switching and a control method thereof, aiming at the problem that the switching loss is high because the switching-on process of a switching tube in a Boost converter is in a hard switching-on state and a hard switching-off state.
In a first aspect, a soft-switching based converter is provided, which includes a power supply, a boost module, and an output module;
the boosting module comprises a first boosting module and a second boosting module;
the first boosting module comprises a first input unit, a first resonance unit and a first resonance capacitor;
the first input unit comprises a first inductor and a first switching tube, wherein the first end of the first inductor is connected with the positive pole of the power supply, the second end of the first inductor is connected with the first end of the first switching tube, and the second end of the first switching tube is connected with the negative pole of the power supply;
the first resonance unit comprises a first resonance inductor, the first end of the first resonance inductor is connected with the second end of the first inductor, and the second end of the first resonance inductor is connected with the first end of the first resonance capacitor;
the second boosting module comprises a second input unit, a second resonance unit and a second resonance capacitor;
the second input unit comprises a second inductor and a second switching tube, wherein the first end of the second inductor is connected with the positive electrode of the power supply, the second end of the second inductor is connected with the first end of the second switching tube, and the second end of the second switching tube is connected with the negative electrode of the power supply;
the second resonance unit comprises a second resonance inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a first capacitor, a second capacitor and a third capacitor;
the cathode of the first diode is connected with the cathode of the second diode and the anode of the fifth diode, the anode of the second diode is connected with the first end of the second switching tube, the first end of the first capacitor and the first end of the second resonant inductor, the second end of the first capacitor is connected with the anode of the fifth diode, the second end of the second resonant inductor is connected with the anode of the sixth diode, and the cathode of the sixth diode is connected with the cathode of the fifth diode, the anode of the eighth diode and the first end of the third capacitor; the first end of the second capacitor is connected with the anode of the second diode, the second end of the second capacitor is connected with the anode of the third diode and the cathode of the fourth diode, the anode of the seventh diode is connected with the anode of the fourth diode, and the cathode of the seventh diode is connected with the cathode of the third diode;
and the first end of the second resonant capacitor is connected with the second end of the second resonant inductor, and the second resonant capacitor is connected with the output module.
Optionally, there are one or more second boosting modules.
Optionally, the output module includes an output capacitor and a load;
the first end of the first resonant inductor is connected with the anode of the first diode; the cathode of the seventh diode is connected with the second end of the first switching tube, and the anode of the seventh diode is connected with the second end of the first resonant capacitor; the second end of the first resonant capacitor is connected with the second end of the second resonant capacitor through a switch diode; the anode of the switch diode is connected with the first end of the second resonant capacitor, and the cathode of the switch diode is connected with the first resonant capacitor; the second end of the third capacitor is connected with the first end of the first resonance capacitor;
the first end of the output capacitor is connected with the first end of the load, the second end of the output capacitor is connected with the first end of the second resonance capacitor, and the second end of the second resonance capacitor is connected with the second end of the load; and the cathode of the eighth diode is connected with the first end of the output capacitor.
Optionally, the second resonance unit includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, and a seventh port;
the anode of the first diode is the first port of the second resonance unit, the anode of the second diode is the second port of the second resonance unit, the cathode of the eighth diode is the third port of the second resonance unit, the second end of the third capacitor is the fourth port of the second resonance unit, the second end of the second resonance inductor is the fifth port of the second resonance unit, the cathode of the seventh diode is the sixth port of the second resonance unit, and the anode of the seventh diode is the seventh port of the second resonance unit;
the second boosting modules are multiple, and the structures of the second boosting modules are the same; a first port of a second resonant unit of the 1 st second boost module is connected with a first end of the first resonant inductor, a sixth port of the second resonant unit of the 1 st second boost module is connected with a negative electrode of the power supply, and a fourth port of the second resonant unit of the 1 st second boost module is connected with a first end of the first resonant capacitor;
a first port of a second resonance unit of an ith second boost module is connected with a second port of a second resonance unit of an ith-1 second boost module, a sixth port of the second resonance unit of the ith second boost module is connected with a seventh port of the second resonance unit of the ith-1 second boost module, a fourth port of the second resonance unit of the ith second boost module is connected with a fifth port of the second resonance unit of the ith-1 second boost module, i belongs to {2,3, \ 8230 \ 8230, n }, n is the number of the second boost modules, and n is greater than 1; a seventh port of the second resonance unit of the nth second boost module is connected with the second end of the first resonance capacitor;
the third port of the second resonance unit of each second boosting module is respectively connected with the output module;
also includes n switching diodes;
the anode of the 1 st switch diode is connected with the second end of the second resonant capacitor of the nth second boosting module, the anode of the jth switch diode is connected with the second end of the second resonant capacitor of the jth-1 second boosting module and the cathode of the jth-1 switch diode, and j is epsilon {2,3, \8230 \ 8230, n }, and the cathode of the nth switch diode is connected with the second end of the first resonant capacitor.
Optionally, the output module includes an output capacitor and a load;
and a third port of the second resonance unit of each second boosting module is respectively connected with a first end of the output capacitor, a second end of the output capacitor is connected with a first end of the second resonance capacitor of the nth second boosting module, a first end of the load is connected with a first end of the output capacitor, and a second end of the load is connected with a second end of the second resonance capacitor of the nth second boosting module.
Optionally, the first switching tube is an MOS tube, and the second switching tube is an MOS tube;
the first end of the first switch tube is a drain electrode of the MOS tube, the second end of the first switch tube is a drain electrode of the MOS tube, and the third end of the first switch tube is a grid electrode of the MOS tube;
the first end of the second switch tube is the drain electrode of the MOS tube, the second end of the second switch tube is the drain electrode of the MOS tube, and the third end of the second switch tube is the grid electrode of the MOS tube.
Optionally, when there is one second boost module, the voltage gain of the converter is M = 4/(1-D); in the formula, D is the duty ratio of the first switching tube.
Optionally, when there are n second boost modules, the voltage gain of the converter is M =2 x (n + 1)/(1-D); in the formula, D is the duty ratio of the first switching tube, and n is the number of the boosting modules.
In a second aspect, there is provided a control method for a soft-switching based converter according to the first aspect, comprising the steps of:
generating a first control signal and a second control signal, wherein the phase difference between the first control signal and the second control signal is 180 degrees, and the duty ratios of the first control signal and the second control signal are the same and are more than 0.5;
and transmitting the first control signal to the third end of the first switching tube, and transmitting the second control signal to the third end of the second switching tube, so that the converter works in six working modes in a half working period.
Optionally, the six working modes are as follows:
a first working mode: the first switch tube, the sixth diode and the switch diode are conducted, and the power supply charges the first inductor, the second inductor, the first resonant inductor, the second resonant inductor, the third capacitor, the first resonant capacitor and the second resonant capacitor; the current of the first inductor, the second inductor, the first resonant inductor and the second resonant inductor rises linearly; the power supply, the output capacitor and the second resonant capacitor provide energy for the load; meanwhile, the first resonant inductor and the second resonant inductor limit the current rise of the second switching tube, and the second switching tube is switched on at zero current;
the second working mode is as follows: the first switch tube, the second switch tube and the fourth diode are conducted, the power supply charges the first inductor and the second inductor, and the currents of the first inductor and the second inductor are increased; the second capacitor and the first resonant inductor charge the first resonant capacitor; the current of the first resonant inductor is interrupted, and the output capacitor and the second resonant capacitor supply energy to the load;
a third working mode: the first switch tube and the second switch tube are conducted, the power supply charges the first inductor and the second inductor, the inductor currents of the first inductor and the second inductor rise linearly, and the output capacitor and the second resonant capacitor provide energy for the load;
the fourth working mode: the first diode and the fourth diode are conducted, the power supply charges the second inductor, and the current of the second inductor is increased; the power supply and the first inductor charge the first capacitor, and the current of the first inductor is reduced; the output capacitor and the second resonant capacitor supply energy to the load; the second capacitor, the first resonant capacitor, the first inductor and the first resonant inductor resonate, and when the voltage at the two ends of the second capacitor resonates to zero, the first switching tube is turned off at zero voltage;
a fifth working mode: the second switch tube, the first diode, the seventh diode and the switch diode are conducted, the power supply charges the second inductor, and the current of the second inductor is increased; the power supply, the first inductor and the first resonant inductor charge the first resonant capacitor, and the current of the first inductor is reduced; the power supply and the first inductor charge the first capacitor; the power supply, the second inductor L2 and the second resonant inductor charge the second resonant capacitor, and the current of the first diode is reduced; the power supply, the second inductor, the second resonant inductor, the output capacitor and the second resonant capacitor provide energy for the load;
a sixth working mode: the second switch tube, the first diode, the fifth diode, the seventh diode, the eighth diode and the switch diode are conducted, the power supply charges the second inductor, and the current of the second inductor is increased; the power supply and the first inductor charge the first capacitor, the output capacitor and the second resonant capacitor and provide energy for the load, and the current of the first inductor is reduced; the power supply, the first inductor and the first resonant inductor charge the first resonant capacitor.
Has the advantages that: the first switch tube and the second switch tube of the converter provided by the invention realize zero current switching-on and zero voltage switching-off, and can effectively reduce the loss of the switching-on and switching-off processes of the first switch tube and the second switch tube under a high-frequency working environment; meanwhile, the converter provided by the embodiment has higher voltage gain.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 shows a schematic diagram of a converter based on soft switching according to this embodiment.
Fig. 2 shows a schematic diagram of a second soft-switching based converter provided in this embodiment.
Fig. 3 shows a schematic diagram of a third soft-switching based converter provided in this embodiment.
Fig. 4 shows the main operation waveforms of a converter based on soft switching in one operation cycle according to the present embodiment.
Fig. 5 shows an equivalent circuit diagram of a converter based on soft switching in the first operating mode according to the present embodiment.
Fig. 6 shows an equivalent circuit diagram of a converter based on soft switching in the second operation mode according to the present embodiment.
Fig. 7 shows an equivalent circuit diagram of a converter based on soft switching in a third operation mode according to the present embodiment.
Fig. 8 shows an equivalent circuit diagram of a converter based on soft switching in the fourth operating mode according to the present embodiment.
Fig. 9 shows an equivalent circuit diagram of a converter based on soft switching in the fifth operation mode according to the present embodiment.
Fig. 10 shows an equivalent circuit diagram of a converter based on soft switching in a sixth operating mode according to the present embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
As shown in fig. 1, the present embodiment provides a converter based on soft switching, which includes a power source Vin, a boost module, and an output module;
the boosting module comprises a first boosting module and a second boosting module.
The first boosting module comprises a first input unit, a first resonant unit and a first resonant capacitor Cs1;
the first input unit comprises a first inductor L1 and a first switching tube S1, wherein the first end of the first inductor L1 is connected with the positive pole of a power source Vin, the second end of the first inductor L1 is connected with the first end of the first switching tube S1, and the second end of the first switching tube S1 is connected with the negative pole of the power source Vin;
the first resonant unit comprises a first resonant inductor Ls1, a first end of the first resonant inductor Ls1 is connected with a second end of the first inductor L1, and a second end of the first resonant inductor Ls1 is connected with a first end of the first resonant capacitor Cs 1.
In the first boost module, a first resonant capacitor Cs1 and a first resonant inductor Ls1 form a resonant relationship, so that the first switching tube S1 is turned off at zero voltage.
The second boosting module comprises a second input unit, a second resonance unit and a second resonance capacitor Cs2;
the second input unit comprises a second inductor L2 and a second switch tube S2, the first end of the second inductor L2 is connected with the positive pole of the power Vin, the second end of the second inductor L2 is connected with the first end of the second switch tube S2, and the second end of the second switch tube S2 is connected with the negative pole of the power Vin;
the second resonance unit comprises a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a first capacitor C1, a second capacitor C2 and a third capacitor C3;
the cathode of the first diode D1 is connected with the cathode of the second diode D2 and the anode of the fifth diode D5, the anode of the second diode D2 is connected with the first end of the second switching tube S2, the first end of the first capacitor C1 and the first end of the second resonant inductor Ls2, the second end of the first capacitor C1 is connected with the anode of the fifth diode D5, the second end of the second resonant inductor Ls2 is connected with the anode of the sixth diode D6, the cathode of the sixth diode D6 is connected with the cathode of the fifth diode D5, the anode of the eighth diode D8 and the first end of the third capacitor C3; a first end of the second capacitor C2 is connected with an anode of the second diode D2, a second end of the second capacitor C2 is connected with an anode of the third diode D3 and a cathode of the fourth diode D4, an anode of the seventh diode D7 is connected with an anode of the fourth diode D4, and a cathode of the seventh diode D7 is connected with a cathode of the third diode D3;
a first end of the second resonant capacitor Cs2 is connected to a second end of the second resonant inductor Ls2, and a first end of the second resonant capacitor Cs2 is connected to the output module.
The first end of the first resonant inductor Ls1 is connected with the anode of the first diode D1; the cathode of the seventh diode D7 is connected to the second end of the first switching tube S1, and the anode of the seventh diode D7 is connected to the second end of the first resonant capacitor Cs1; a second end of the first resonant capacitor Cs1 is connected to a second end of the second resonant capacitor Cs2 through a switching diode Da; the anode of the switching diode Da is connected with the first end of the second resonant capacitor Cs2, and the cathode of the switching diode Da is connected with the first resonant capacitor Cs1; a second terminal of the third capacitor C3 is connected to a first terminal of the first resonant capacitor Cs 1.
In the second boost module, a second resonant capacitor Cs2 and a second resonant inductor Ls2 form a resonant relationship, so that the second switching tube S2 is turned off at zero voltage.
The output module comprises an output capacitor Co and a load R, wherein a first end of the output capacitor Co is connected with a first end of the load R, a second end of the output capacitor Co is connected with a first end of a second resonance capacitor Cs2, and a second end of the second resonance capacitor Cs2 is connected with a second end of the load R; the cathode of the eighth diode D8 is connected to the first end of the output capacitor Co.
In this embodiment, the first switching tube S1 is an MOS tube, and the second switching tube S2 is an MOS tube; the first end of the first switching tube S1 is a drain electrode of an MOS tube, the second end of the first switching tube S1 is a drain electrode of the MOS tube, and the third end of the first switching tube S1 is a grid electrode of the MOS tube; the first end of the second switch tube S2 is a drain electrode of the MOS tube, the second end of the second switch tube S2 is a drain electrode of the MOS tube, and the third end of the second switch tube S2 is a gate electrode of the MOS tube.
The converter provided by this embodiment operates in the following six operating modes in the first half operating cycle:
a first mode of operation: as shown in fig. 5, the first switching tube S1, the sixth diode D6 and the switching diode Da are turned on, and the power source Vin charges the first inductor L1, the second inductor L2, the first resonant inductor Ls1, the second resonant inductor Ls2, the third capacitor C3, the first resonant capacitor Cs1 and the second resonant capacitor Cs2; the currents of the first inductor L1, the second inductor L2, the first resonant inductor Ls1 and the second resonant inductor Ls2 rise linearly; the power source Vin, the output capacitor Co and the second resonant capacitor Cs2 provide energy for the load R; meanwhile, the first resonant inductor Ls1 and the second resonant inductor Ls2 limit the current rise of the second switching tube S2, and the second switching tube S2 is switched on at zero current;
the second working mode is as follows: as shown in fig. 6, the first switch tube S1, the second switch tube S2, and the fourth diode D4 are turned on, the power source Vin charges the first inductor L1 and the second inductor L2, and the currents of the first inductor L1 and the second inductor L2 increase; the second capacitor C2 and the first resonant inductor Ls1 charge the first resonant capacitor Cs1; the current of the first resonant inductor Ls1 is interrupted, and the output capacitor Co and the second resonant capacitor Cs2 provide energy for the load R;
a third working mode: as shown in fig. 7, the first switch tube S1 and the second switch tube S2 are turned on, the power source Vin charges the first inductor L1 and the second inductor L2, the inductor current of the first inductor L1 and the second inductor L2 increases linearly, and the output capacitor Co and the second resonant capacitor Cs2 provide energy to the load R;
the fourth working mode: as shown in fig. 8, the first diode D1 and the fourth diode D4 are turned on, the power source Vin charges the second inductor L2, and the current of the second inductor L2 increases; the power Vin and the first inductor L1 charge the first capacitor C1, and the current of the first inductor L1 is reduced; the output capacitor Co and the second resonant capacitor Cs2 provide energy for the load R; the second capacitor C2, the first resonant capacitor Cs1, the first inductor L1 and the first resonant inductor Ls1 resonate, and when the voltage at two ends of the second capacitor C2 resonates to zero, the first switching tube S1 is turned off at zero voltage;
a fifth working mode: as shown in fig. 9, the second switch tube S2, the first diode D1, the seventh diode D7 and the switch diode Da are turned on, the power source Vin charges the second inductor L2, and the current of the second inductor L2 increases; a power source Vin, a first inductor L1 and a first resonant inductor Ls1 charge a first resonant capacitor Cs1, and the current of the first inductor L1 is reduced; a power supply Vin and a first inductor L1 charge a first capacitor C1; the power source Vin, the second inductor L2 and the second resonant inductor Ls2 charge the second resonant capacitor Cs2, and the current of the first diode D1 is reduced; a power source Vin, a second inductor L2, a second resonant inductor Ls2, an output capacitor Co and a second resonant capacitor Cs2 provide energy for a load R;
a sixth working mode: as shown in fig. 10, the second switch tube S2, the first diode D1, the fifth diode D5, the seventh diode D7, the eighth diode D8 and the switch diode Da are turned on, the power source Vin charges the second inductor L2, and the current of the second inductor L2 increases; the power source Vin and the first inductor L1 charge the first capacitor C1, the output capacitor Co and the second resonant capacitor Cs2, energy is provided for the load R, and the current of the first inductor L1 is reduced; the power source Vin, the first inductor L1 and the first resonant inductor Ls1 charge the first resonant capacitor Cs 1.
And after the sixth working mode is finished, the converter enters the next half working cycle, and the mode operation of the next half working cycle is similar to that of the last half working cycle.
Referring to fig. 4, the main operating waveforms of the converter in one operating cycle are shown, where the converter operates in the first operating mode in the time period t0-t1, the converter operates in the second operating mode in the time period t1-t2, the converter operates in the third operating mode in the time period t2-t3, the converter operates in the fourth operating mode in the time period t3-t4, the converter operates in the fifth operating mode in the time period t4-t5, the converter operates in the sixth operating mode in the time period t5-t6, the converter operates in the next half operating cycle in the time period t6-t12, and the converter starts to operate in the next operating cycle from time t 12. In the figure, the position of the upper end of the main shaft,i S1 representing the current of the first switching tube S1,i S2 representing the current of the second switching tube S2,u S1 the voltage of the first switching tube S1 is shown,u S2 to representThe voltage of the second switching tube S2,Tsis the duty cycle of the converter and is,D S1 is the duty cycle of the first switching tube S1,D S2 is the duty cycle of the second switching tube S2.
When the converter is in a steady state, the working cycles of the first switching tube S1 and the second switching tube S2 are the same, the duty ratios of the first switching tube S1 and the second switching tube S2 are the same, and the following relationship can be obtained in the steady state by applying volt-second balance to the first inductor L1 and the second inductor L2:
V in *D=(V CS1 -V in )*(1-D)
V in *D=(V CO -V C3 -V in )*(1-D)
V in *D=(V C3 -V in )*(1-D)
V in *D=(V CS2 -V CS1 -V in )*(1-D)
in the formula (I), the compound is shown in the specification,V in is the voltage across the power supply Vin,Dthe duty ratio of the first switch tube S1 and the second switch tube S2,V CS1 is the voltage across the first resonant capacitor Cs1,V CS2 is the voltage across the second resonant capacitor Cs2,V C3 is the voltage across the third capacitor C3,V CO to output electricityThe voltage across Co is contained.
The voltages of the first resonant capacitor Cs1, the second resonant capacitor Cs2, the third capacitor C3 and the output capacitor Co can be obtained by the above equation, that is:
V C3 =V in /(1-D)
V CS1 =V in /(1-D)
V CO =V C3 +V CS1 =2*V in /(1-D)
V CS2 =V C3 +V CS1 =2*V in /(1-D)
thus, it is possible to obtain:
V O =V CO +V CS2 =4*V in /(1-D)
in the formula (I), the compound is shown in the specification,V O is the output voltage of the converter, i.e. the voltage across the load R;
the voltage gain M of the converter thus obtained is
M=V O /V in =4/（1-D）
In the converter provided by the embodiment, the first switch tube S1 and the second switch tube S2 both realize zero current switching-on and zero voltage switching-off, and the loss of the switching-on and switching-off processes of the first switch tube S1 and the second switch tube S2 under a high-frequency working environment can be effectively reduced; meanwhile, the converter provided by the embodiment has higher voltage gain.
Example 2
As shown in fig. 2, the present embodiment provides a converter based on soft switching, which includes a power source Vin, a boost module, an output module, and a switching diode;
the boosting module comprises a first boosting module and a second boosting module; the output module comprises an output capacitor Co and a load R; there are two switching diodes, which are the 1 st switching diode Da1 and the 2 nd switching diode Da2.
Specifically, the first boost module includes a first input unit, a first resonant unit, and a first resonant capacitor Cs1;
the first input unit comprises a first inductor L1 and a first switch, wherein a first end of the first inductor L1 is connected with the positive pole of the power Vin, a second end of the first inductor L1 is connected with a first end of a first switching tube S1, and a second end of the first switching tube S1 is connected with the negative pole of the power Vin;
the first resonant unit comprises a first resonant inductor Ls1, a first end of the first resonant inductor Ls1 is connected with a second end of the first inductor L1, and a second end of the first resonant inductor Ls1 is connected with a first end of the first resonant capacitor Cs 1.
Specifically, the second boost module comprises a second input unit, a second resonance unit and a second resonance capacitor;
the second input unit comprises a second inductor L2 and a second switch, a first end of the second inductor L2 is connected with the positive electrode of the power source Vin, a second end of the second inductor L2 is connected with a first end of a second switch tube S2, and a second end of the second switch tube S2 is connected with the negative electrode of the power source Vin;
the second resonance unit comprises a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a first capacitor C1, a second capacitor C2 and a third capacitor C3; the cathode of the first diode D1 is connected with the cathode of the second diode D2 and the anode of the fifth diode D5, the anode of the second diode D2 is connected with the first end of the second switching tube S2, the first end of the first capacitor C1 and the first end of the second resonant inductor Ls2, the second end of the first capacitor C1 is connected with the anode of the fifth diode D5, the second end of the second resonant inductor Ls2 is connected with the anode of the sixth diode D6, the cathode of the sixth diode D6 is connected with the cathode of the fifth diode D5, the anode of the eighth diode D8 and the first end of the third capacitor C3; a first end of the second capacitor C2 is connected to an anode of the second diode D2, a second end of the second capacitor C2 is connected to an anode of the third diode D3 and a cathode of the fourth diode D4, an anode of the seventh diode D7 is connected to an anode of the fourth diode D4, and a cathode of the seventh diode D7 is connected to a cathode of the third diode D3.
The second resonance unit comprises a first port, a second port, a third port, a fourth port, a fifth port, a sixth port and a seventh port;
the anode of the first diode D1 is the first port of the second resonance unit, the anode of the second diode D2 is the second port of the second resonance unit, the cathode of the eighth diode D8 is the third port of the second resonance unit, the second end of the third capacitor C3 is the fourth port of the second resonance unit, the second end of the second resonance inductor Ls2 is the fifth port of the second resonance unit, the cathode of the seventh diode D7 is the sixth port of the second resonance unit, and the anode of the seventh diode D7 is the seventh port of the second resonance unit.
In this embodiment, there are two second voltage boosting modules, which are respectively a1 st second voltage boosting module and a2 nd second voltage boosting module; the 1 st second boosting module and the 2 nd second boosting module have the same structure; the converter further comprises switching diodes, namely a1 st switching diode Da1 and a2 nd switching diode Da2
The second input unit of the 1 st second boost module is referred to as the 1 st second input unit, the second resonant unit of the 1 st second boost module is referred to as the 1 st second resonant unit, and the resonant capacitor of the 1 st second boost module is referred to as the 1 st second resonant capacitor Cs21.
The second input unit of the 2 nd second boost module is referred to as a2 nd second input unit, the second resonant unit of the 2 nd second boost module is referred to as a2 nd second resonant unit, and the resonant capacitor of the 2 nd second boost module is referred to as a2 nd second resonant capacitor Cs22.
A first end of a second inductor L2 of the 1 st second input unit is connected with the positive electrode of a power source Vin, and a second end of a second switching tube S2 of the 1 st second input unit is connected with the negative electrode of the power source Vin; a first end of a second inductor L2 of the 2 nd second input unit is connected to a positive electrode of the power source Vin, and a second end of a second switching tube S2 of the 2 nd second input unit is connected to a negative electrode of the power source Vin.
A first port of the 1 st second resonance unit is connected with a second end of the first inductor L1, and a second port of the 1 st second resonance unit is connected with a first end of a second switching tube S2 of the 1 st second input unit; the third port of the 1 st second resonant unit is connected to the first end of the output capacitor Co, the fourth port of the 1 st second resonant unit is connected to the second end of the first resonant inductor Ls1, and the fifth port of the 1 st second resonant unit is connected to the first end of the 1 st second resonant capacitor Cs21.
A first port of the 2 nd second resonant unit is connected to a second port of the 1 st second resonant unit, a second port of the 2 nd second resonant unit is connected to a first end of a second switching tube S2 of the 2 nd second input unit, a third port of the 2 nd second resonant unit is connected to a first end of an output capacitor Co, a fourth port of the 2 nd second resonant unit is connected to a fifth port of the 1 st second resonant unit, a fifth port of the 2 nd second resonant unit is connected to a first end of a2 nd second resonant capacitor Cs22, a seventh port of the 2 nd second resonant unit is connected to a second end of the first resonant capacitor Cs1 and a cathode of a second switching diode, an anode of the 2 nd switching diode Da2 is connected to a second end of the 1 st second resonant capacitor Cs21 and a cathode of the 1 st switching diode Da1, an anode of the 1 st switching diode Da1 is connected to a second end of the 2 nd second resonant capacitor Cs22, a second end of the second resonant diode Da2 nd resonant capacitor Cs is connected to a second end of the second resonant capacitor Cs22, and a second end of the second resonant capacitor R22 is connected to a second end of the second output capacitor Co, and a load Co is connected to a load.
The converter provided by this embodiment has a voltage gain of M = 6/(1-D), D is the duty ratio of the first switching tube S1 and the second switching tube S2, and the duty ratio of the second switching tube S2 is the same as the duty ratio of the first switching tube S1.
Example 3
As shown in fig. 3, the present embodiment provides a converter based on soft switching, which includes a power source Vin, a boost module, an output module, and a switching diode;
in this embodiment, the boost module includes a first boost module and a second boost module; the number of the second boosting modules is multiple, and the output module comprises an output capacitor Co and a load R; the number of the switching diodes is the same as that of the second boosting modules.
Specifically, the first boost module includes a first input unit, a first resonant unit, and a first resonant capacitor Cs1;
the first input unit comprises a first inductor L1 and a first switch, wherein a first end of the first inductor L1 is connected with the positive pole of the power Vin, a second end of the first inductor L1 is connected with a first end of a first switching tube S1, and a second end of the first switching tube S1 is connected with the negative pole of the power Vin;
the first resonant unit comprises a first resonant inductor Ls1, a first end of the first resonant inductor Ls1 is connected with a second end of the first inductor L1, and a second end of the first resonant inductor Ls1 is connected with a first end of a first resonant capacitor Cs 1.
Specifically, the second boost module comprises a second input unit, a second resonance unit and a second resonance capacitor;
the second input unit comprises a second inductor L2 and a second switch, the first end of the second inductor L2 is connected with the positive pole of the power Vin, the second end of the second inductor L2 is connected with the first end of a second switch tube S2, and the second end of the second switch tube S2 is connected with the negative pole of the power Vin;
the second resonance unit comprises a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a first capacitor C1, a second capacitor C2 and a third capacitor C3; the cathode of the first diode D1 is connected with the cathode of the second diode D2 and the anode of the fifth diode D5, the anode of the second diode D2 is connected with the first end of the second switching tube S2, the first end of the first capacitor C1 and the first end of the second resonant inductor Ls2, the second end of the first capacitor C1 is connected with the anode of the fifth diode D5, the second end of the second resonant inductor Ls2 is connected with the anode of the sixth diode D6, the cathode of the sixth diode D6 is connected with the cathode of the fifth diode D5, the anode of the eighth diode D8 and the first end of the third capacitor C3; a first end of the second capacitor C2 is connected with an anode of the second diode D2, a second end of the second capacitor C2 is connected with an anode of the third diode D3 and a cathode of the fourth diode D4, an anode of the seventh diode D7 is connected with an anode of the fourth diode D4, and a cathode of the seventh diode D7 is connected with a cathode of the third diode D3;
the first end of the second resonant capacitor is connected with the second end of the second resonant inductor Ls2, and the second resonant capacitor is connected with the output module.
The second resonance unit comprises a first port, a second port, a third port, a fourth port, a fifth port, a sixth port and a seventh port;
the anode of the first diode D1 is the first port of the second resonance unit, the anode of the second diode D2 is the second port of the second resonance unit, the cathode of the eighth diode D8 is the third port of the second resonance unit, the second end of the third capacitor C3 is the fourth port of the second resonance unit, the second end of the second resonance inductor Ls2 is the fifth port of the second resonance unit, the cathode of the seventh diode D7 is the sixth port of the second resonance unit, and the anode of the seventh diode D7 is the seventh port of the second resonance unit.
The structures of the second boosting modules are the same, in this embodiment, the second input unit of the kth second boosting module is referred to as a kth second input unit, the second resonance unit of the kth second boosting module is referred to as a kth second resonance unit, the second resonance capacitor of the kth second boosting module is referred to as a kth second resonance capacitor, and k e {1,2, \\ 8230; \8230, n }, n is the number of the second boosting modules.
The first port of the 1 st second resonant unit is connected to the first end of the first resonant inductor Ls1, the third port of the 1 st second resonant unit is connected to the first end of the output capacitor Co, the sixth port of the 1 st second resonant unit is connected to the negative electrode of the power source Vin, and the fourth port of the 1 st second resonant unit is connected to the first end of the first resonant capacitor Cs 1.
A first port of the 2 nd second resonance unit is connected with a second port of the 1 st second resonance unit, a third port of the 2 nd second resonance unit is connected with a first end of the output capacitor Co, a sixth port of the 2 nd second resonance unit is connected with a seventh port of the 1 st second resonance unit, and a fourth port of the 2 nd second resonance unit is connected with a fifth port of the 1 st second resonance unit;
in the same way as above, the first port of the ith second resonant unit is connected with the second port of the (i-1) th second resonant unit, the third port of the ith second resonant unit is connected with the first end of the output capacitor Co, the sixth port of the ith second resonant unit is connected with the seventh port of the (i-1) th second resonant unit, the fourth port of the ith second resonant unit is connected with the fifth port of the (i-1) th second resonant unit, i ∈ {2,3, \8230;, n }, n is the number of the second boosting modules, and n is greater than 1. The seventh port of the nth second resonant unit is connected to the second terminal of the first resonant capacitor Cs1, and the fourth port of the nth second resonant unit is connected to the first terminal of the (n-1) th second resonant capacitor Cs2 (n-1).
The anode of the 1 st switching diode Da1 is connected to the second end of the nth second resonant capacitor Cs2 n.
The anode of the 2 nd switching diode Da2 is connected to the second end of the 1 st second resonant capacitor Cs21 and the cathode of the 1 st switching diode Da 1; the anode of the 3 rd switching diode is connected to the second end of the 2 nd second resonant capacitor Cs22 and the cathode of the 2 nd switching diode Da 2; similarly, the anode of the jth switching diode is connected to the second terminal of the jth-1 second resonant capacitor and the cathode of the jth-1 switching diode, j ∈ {2,3, \ 8230 \ 8230; \ n }, and the cathode of the nth switching diode Dan is connected to the second terminal of the first resonant capacitor Cs 1.
The second end of the output capacitor Co is connected with the first end of the nth second resonant capacitor Cs2n, the first end of the load R is connected with the first end of the output capacitor Co, and the second end of the load R is connected with the second end of the nth second resonant capacitor Cs2 n.
The first switch tube S1 is an MOS tube, and the second switch tube S2 is an MOS tube; the first end of the first switching tube S1 is a drain electrode of an MOS tube, the second end of the first switching tube S1 is a drain electrode of the MOS tube, and the third end of the first switching tube S1 is a grid electrode of the MOS tube; the first end of the second switch tube S2 is a drain electrode of the MOS tube, the second end of the second switch tube S2 is a drain electrode of the MOS tube, and the third end of the second switch tube S2 is a gate electrode of the MOS tube.
In this embodiment, the boost modules include 1 first boost module and n second boost modules, and thus, the voltage gain of the converter is M =2 × (n + 1)/(1-D); in the formula, D is the duty ratio of the first switching tube S1 and the second switching tube S2, the duty ratio of the first switching tube S1 is the same as the duty ratio of the second switching tube S2, and n is the number of the second boosting modules.
The first switch tube S1 and the second switch tube S2 of the converter provided by the embodiment realize zero current switching-on and zero voltage switching-off, and can effectively reduce the loss of the switching-on and switching-off processes of the first switch tube S1 and the second switch tube S2 in a high-frequency working environment; meanwhile, the voltage gain of the converter can be further improved by increasing the number of the second boosting modules.
Example 4
This embodiment provides a method for controlling a soft-switching based converter, which is applied to a soft-switching based converter with 1 second boost module, and includes the following steps:
generating a first control signal and a second control signal, wherein the phase difference between the first control signal and the second control signal is 180 degrees, and the duty ratios of the first control signal and the second control signal are the same and are more than 0.5;
and transmitting the first control signal to the third end of the first switching tube S1, and transmitting the second control signal to the third end of the second switching tube S2, so that the converter works in six working modes in a half working period.
The six working modes are as follows:
a first working mode: as shown in fig. 5, the first switching tube S1, the sixth diode D6 and the switching diode Da are turned on, and the power source Vin charges the first inductor L1, the second inductor L2, the first resonant inductor Ls1, the second resonant inductor Ls2, the third capacitor C3, the first resonant capacitor Cs1 and the second resonant capacitor Cs2; the currents of the first inductor L1, the second inductor L2, the first resonant inductor Ls1 and the second resonant inductor Ls2 rise linearly; the power source Vin, the output capacitor Co and the second resonant capacitor Cs2 provide energy for the load R; meanwhile, the first resonant inductor Ls1 and the second resonant inductor Ls2 limit the current rise of the second switching tube S2, and the second switching tube S2 is switched on at zero current;
and a second working mode: as shown in fig. 6, the first switch tube S1, the second switch tube S2, and the fourth diode D4 are turned on, the power source Vin charges the first inductor L1 and the second inductor L2, and the currents of the first inductor L1 and the second inductor L2 increase; the second capacitor C2 and the first resonant inductor Ls1 charge the first resonant capacitor Cs1; the current of the first resonant inductor Ls1 is interrupted, and the output capacitor Co and the second resonant capacitor Cs2 provide energy for the load R;
a third working mode: as shown in fig. 7, the first switch tube S1 and the second switch tube S2 are turned on, the power source Vin charges the first inductor L1 and the second inductor L2, the inductor current of the first inductor L1 and the second inductor L2 increases linearly, and the output capacitor Co and the second resonant capacitor Cs2 provide energy for the load R;
the fourth working mode: as shown in fig. 8, the first diode D1 and the fourth diode D4 are turned on, the power source Vin charges the second inductor L2, and the current of the second inductor L2 increases; the power Vin and the first inductor L1 charge the first capacitor C1, and the current of the first inductor L1 is reduced; the output capacitor Co and the second resonant capacitor Cs2 provide energy for the load R; the second capacitor C2, the first resonant capacitor Cs1, the first inductor L1 and the first resonant inductor Ls1 resonate, and when the voltage at the two ends of the second capacitor C2 resonates to zero, the first switching tube S1 is turned off at zero voltage;
a fifth working mode: as shown in fig. 9, the second switch tube S2, the first diode D1, the seventh diode D7 and the switch diode Da are turned on, the power source Vin charges the second inductor L2, and the current of the second inductor L2 increases; a power source Vin, a first inductor L1 and a first resonant inductor Ls1 charge a first resonant capacitor Cs1, and the current of the first inductor L1 is reduced; a power source Vin and a first inductor L1 charge a first capacitor C1; the power source Vin, the second inductor L2 and the second resonant inductor Ls2 charge the second resonant capacitor Cs2, and the current of the first diode D1 is reduced; a power source Vin, a second inductor L2, a second resonant inductor Ls2, an output capacitor Co and a second resonant capacitor Cs2 provide energy for a load R;
a sixth working mode: as shown in fig. 10, the second switch tube S2, the first diode D1, the fifth diode D5, the seventh diode D7, the eighth diode D8 and the switch diode Da are turned on, the power source Vin charges the second inductor L2, and the current of the second inductor L2 increases; the power source Vin and the first inductor L1 charge the first capacitor C1, the output capacitor Co and the second resonant capacitor Cs2, energy is provided for the load R, and the current of the first inductor L1 is reduced; the power source Vin, the first inductor L1 and the first resonant inductor Ls1 charge the first resonant capacitor Cs 1.
And after the sixth working mode is finished, the converter enters the next half working period, and the mode operation of the next half working period is similar to that of the last half working period.
Referring to fig. 4, the converter operates in the first working mode in the time period t0-t1, the converter operates in the second working mode in the time period t1-t2, the converter operates in the third working mode in the time period t2-t3, the converter operates in the fourth working mode in the time period t3-t4, the converter operates in the fifth working mode in the time period t4-t5, the converter operates in the sixth working mode in the time period t5-t6, the converter operates in the next half working cycle in the time period t6-t12, and the converter starts to operate in the next working cycle from the time t 12. In the figure, the position of the upper end of the main shaft,i S1 representing the current of the first switching tube S1,i S2 representing the current of the second switching tube S2,u S1 the voltage of the first switching tube S1 is shown,u S2 the voltage of the second switching tube S2 is shown,Tsis the duty cycle of the converter and is,D S1 is the duty cycle of the first switching tube S1,D S2 is the duty cycle of the first switching tube S1.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar contents in other embodiments may be referred to for the contents which are not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A converter based on soft switching is characterized by comprising a power supply, a boosting module and an output module;
the boosting module comprises a first boosting module and a second boosting module;
the first boosting module comprises a first input unit, a first resonant unit and a first resonant capacitor;
the first input unit comprises a first inductor and a first switching tube, wherein the first end of the first inductor is connected with the positive electrode of the power supply, the second end of the first inductor is connected with the first end of the first switching tube, and the second end of the first switching tube is connected with the negative electrode of the power supply;
the first resonance unit comprises a first resonance inductor, the first end of the first resonance inductor is connected with the second end of the first inductor, and the second end of the first resonance inductor is connected with the first end of the first resonance capacitor;
the second boosting module comprises a second input unit, a second resonance unit and a second resonance capacitor;
the second input unit comprises a second inductor and a second switching tube, wherein the first end of the second inductor is connected with the positive electrode of the power supply, the second end of the second inductor is connected with the first end of the second switching tube, and the second end of the second switching tube is connected with the negative electrode of the power supply;
the second resonance unit comprises a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a first capacitor, a second capacitor and a third capacitor;
the cathode of the first diode is connected with the cathode of the second diode and the anode of the fifth diode, the anode of the second diode is connected with the first end of the second switching tube, the first end of the first capacitor and the first end of the second resonant inductor, the second end of the first capacitor is connected with the anode of the fifth diode, the second end of the second resonant inductor is connected with the anode of the sixth diode, and the cathode of the sixth diode is connected with the cathode of the fifth diode, the anode of the eighth diode and the first end of the third capacitor; the first end of the second capacitor is connected with the anode of the second diode, the second end of the second capacitor is connected with the anode of the third diode and the cathode of the fourth diode, the anode of the seventh diode is connected with the anode of the fourth diode, and the cathode of the seventh diode is connected with the cathode of the third diode;
and the first end of the second resonant capacitor is connected with the second end of the second resonant inductor, and the second resonant capacitor is connected with the output module.
2. The converter based on the soft switch of claim 1, wherein the number of the second boost modules is one or more.
3. The soft-switching based converter according to claim 2, wherein the output module comprises an output capacitor and a load;
the first end of the first resonant inductor is connected with the anode of the first diode; the cathode of the seventh diode is connected with the second end of the first switching tube, and the anode of the seventh diode is connected with the second end of the first resonant capacitor; the second end of the first resonant capacitor is connected with the second end of the second resonant capacitor through a switch diode; the anode of the switch diode is connected with the first end of the second resonant capacitor, and the cathode of the switch diode is connected with the first resonant capacitor; the second end of the third capacitor is connected with the first end of the first resonance capacitor;
the first end of the output capacitor is connected with the first end of the load, the second end of the output capacitor is connected with the first end of the second resonance capacitor, and the second end of the second resonance capacitor is connected with the second end of the load; and the cathode of the eighth diode is connected with the first end of the output capacitor.
4. The converter of claim 2, wherein the second resonant cell comprises a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, and a seventh port;
the anode of the first diode is the first port of the second resonance unit, the anode of the second diode is the second port of the second resonance unit, the cathode of the eighth diode is the third port of the second resonance unit, the second end of the third capacitor is the fourth port of the second resonance unit, the second end of the second resonance inductor is the fifth port of the second resonance unit, the cathode of the seventh diode is the sixth port of the second resonance unit, and the anode of the seventh diode is the seventh port of the second resonance unit;
the number of the second boosting modules is multiple, and the structures of the second boosting modules are the same; a first port of a second resonant unit of the 1 st second boost module is connected with a first end of the first resonant inductor, a sixth port of the second resonant unit of the 1 st second boost module is connected with a negative electrode of the power supply, and a fourth port of the second resonant unit of the 1 st second boost module is connected with a first end of the first resonant capacitor;
a first port of a second resonance unit of an ith second boosting module is connected with a second port of a second resonance unit of an i-1 th second boosting module, a sixth port of the second resonance unit of the ith second boosting module is connected with a seventh port of the second resonance unit of the i-1 th second boosting module, a fourth port of the second resonance unit of the ith second boosting module is connected with a fifth port of the second resonance unit of the i-1 th second boosting module, i belongs to {2,3, \ 8230 \\ 8230, n }, n is the number of the second boosting modules, and n is greater than 1; a seventh port of the second resonance unit of the nth second boost module is connected with the second end of the first resonance capacitor;
the third port of the second resonance unit of each second boosting module is respectively connected with the output module;
the circuit also comprises n switching diodes;
the anode of the 1 st switch diode is connected with the second end of the second resonant capacitor of the nth second boosting module, the anode of the jth switch diode is connected with the second end of the second resonant capacitor of the jth-1 second boosting module and the cathode of the jth-1 switch diode, and j is epsilon {2,3, \8230 \ 8230, n }, and the cathode of the nth switch diode is connected with the second end of the first resonant capacitor.
5. The converter based on the soft switch of claim 4, wherein the output module comprises an output capacitor and a load;
and a third port of the second resonance unit of each second boosting module is respectively connected with a first end of the output capacitor, a second end of the output capacitor is connected with a first end of the second resonance capacitor of the nth second boosting module, a first end of the load is connected with a first end of the output capacitor, and a second end of the load is connected with a second end of the second resonance capacitor of the nth second boosting module.
6. The converter based on the soft switch of any one of claims 1-5, wherein the first switch tube is an MOS tube, and the second switch tube is an MOS tube;
the first end of the first switch tube is a drain electrode of the MOS tube, the second end of the first switch tube is a drain electrode of the MOS tube, and the third end of the first switch tube is a grid electrode of the MOS tube;
the first end of the second switch tube is the drain electrode of the MOS tube, the second end of the second switch tube is the drain electrode of the MOS tube, and the third end of the second switch tube is the grid electrode of the MOS tube.
7. A soft-switching based converter according to claim 3, wherein when there is one second boost module, the voltage gain of the converter is M = 4/(1-D); in the formula, D is the duty ratio of the first switching tube.
8. A soft-switching based converter according to claim 5, wherein when there are n second boost modules, the voltage gain of the converter is M =2 x (n + 1)/(1-D); in the formula, D is the duty ratio of the first switching tube, and n is the number of the boosting modules.
9. A method for controlling a soft-switching based converter according to claim 3, comprising the steps of:
generating a first control signal and a second control signal, wherein the phase difference between the first control signal and the second control signal is 180 degrees, and the duty ratios of the first control signal and the second control signal are the same and are more than 0.5;
and transmitting the first control signal to the third end of the first switching tube, and transmitting the second control signal to the third end of the second switching tube, so that the converter works in six working modes in a half working period.
10. A method for controlling a soft-switching based converter according to claim 3, wherein the six operation modes are as follows:
a first working mode: the first switch tube, the sixth diode and the switch diode are conducted, and the power supply charges the first inductor, the second inductor, the first resonant inductor, the second resonant inductor, the third capacitor, the first resonant capacitor and the second resonant capacitor; the current of the first inductor, the second inductor, the first resonant inductor and the second resonant inductor rises linearly; the power supply, the output capacitor and the second resonant capacitor provide energy for the load; meanwhile, the first resonant inductor and the second resonant inductor limit the current rise of the second switching tube, and the second switching tube is switched on at zero current;
and a second working mode: the first switch tube, the second switch tube and the fourth diode are conducted, the power supply charges the first inductor and the second inductor, and the currents of the first inductor and the second inductor are increased; the second capacitor and the first resonant inductor charge the first resonant capacitor; the current of the first resonant inductor is interrupted, and the output capacitor and the second resonant capacitor supply energy to the load;
a third working mode: the first switch tube and the second switch tube are conducted, the power supply charges the first inductor and the second inductor, the inductor currents of the first inductor and the second inductor rise linearly, and the output capacitor and the second resonant capacitor provide energy for the load;
a fourth mode of operation: the first diode and the fourth diode are conducted, the power supply charges the second inductor, and the current of the second inductor is increased; the power supply and the first inductor charge the first capacitor, and the current of the first inductor is reduced; the output capacitor and the second resonant capacitor supply energy to the load; the second capacitor, the first resonant capacitor, the first inductor and the first resonant inductor resonate, and when the voltage at the two ends of the second capacitor resonates to zero, the first switching tube is turned off at zero voltage;
a fifth working mode: the second switch tube, the first diode, the seventh diode and the switch diode are conducted, the power supply charges the second inductor, and the current of the second inductor is increased; the power supply, the first inductor and the first resonant inductor charge the first resonant capacitor, and the current of the first inductor is reduced; the power supply and the first inductor charge the first capacitor; the power supply, the second inductor L2 and the second resonant inductor charge the second resonant capacitor, and the current of the first diode is reduced; the power supply, the second inductor, the second resonant inductor, the output capacitor and the second resonant capacitor provide energy for the load;
a sixth working mode: the second switch tube, the first diode, the fifth diode, the seventh diode, the eighth diode and the switch diode are conducted, the power supply charges the second inductor, and the current of the second inductor is increased; the power supply and the first inductor charge the first capacitor, the output capacitor and the second resonant capacitor and provide energy for the load, and the current of the first inductor is reduced; the power supply, the first inductor and the first resonant inductor charge the first resonant capacitor.
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CN116155102A (en) * 2023-04-20 2023-05-23 深圳市恒运昌真空技术有限公司 High-gain converter

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