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CN110034681B - Staggered parallel ZVZCS high-boost DC/DC converter - Google Patents

Staggered parallel ZVZCS high-boost DC/DC converter Download PDF

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Publication number
CN110034681B
CN110034681B CN201910351270.XA CN201910351270A CN110034681B CN 110034681 B CN110034681 B CN 110034681B CN 201910351270 A CN201910351270 A CN 201910351270A CN 110034681 B CN110034681 B CN 110034681B
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China
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capacitor
diode
inductor
inductance
switch tube
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CN110034681A (en
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邾玢鑫
黄杨
王辉
杨楠
佘小莉
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • 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
    • 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)
  • Dc-Dc Converters (AREA)

Abstract

An interleaved ZVZCS high-boost DC/DC converter comprises an inductorL 1InductorL 2Switch tube S1Switch tube S2Without, doThe passive buffer circuit comprises a diode D1Diode D2Diode D3Diode D4Diode D5Diode D6Capacitor and method for manufacturing the sameC 1Capacitor and method for manufacturing the sameC 2InductorL S1InductorL S2The first voltage multiplying unit comprises a diode D7Diode D8Capacitor and method for manufacturing the sameC 1aCapacitor and method for manufacturing the sameC 1bThe second voltage multiplying unit comprises a diode D9Diode D10Capacitor and method for manufacturing the sameC 2aCapacitor and method for manufacturing the sameC 2b. By adding the auxiliary circuit, the invention realizes soft switching of the switching tubes S1 and S2, reduces the turn-on and turn-off loss, and improves the working efficiency of the converter; the auxiliary circuit does not contain active elements, has a simpler topological structure and low cost, and does not influence the control strategy and performance of the original converter.

Description

Staggered parallel ZVZCS high-boost DC/DC converter
Technical Field
The invention belongs to the field of DC/DC converters, and particularly relates to a staggered parallel ZVZCS high-boost DC/DC converter.
Background
Photovoltaic power generation has been rapidly developed in recent years, and it is difficult to directly supply direct current meeting the voltage requirement to an inverter due to low output voltage of a photovoltaic cell, and a high-gain DC/DC converter has been widely used therein. However, most of the existing converters do not realize soft switching, and have the problem of large switching-on and switching-off loss of a switching tube. Fig. 2 shows a high-gain DC/DC converter implemented based on a voltage gain unit, which has the advantages of high gain ratio, low voltage stress of semiconductor devices, and the like, compared with the conventional Boost converter. However, all the switching tubes in the converter are in a hard switching state, so that the converter has low working efficiency.
Disclosure of Invention
The invention has the technical problems that all switch tubes of the existing DC/DC converter are in a hard switching state, the converter has lower working efficiency, and the switch tubes have large turn-on and turn-off loss. The invention aims to provide a high-boost DC/DC converter with cross-parallel ZVZCS (Zero Voltage and Zero Current switch), which realizes soft switching of a switching tube by adding an auxiliary circuit, reduces the switching-on and switching-off loss and improves the working efficiency of the converter.
The technical scheme of the invention is that the interleaved parallel ZVZCS high-boost DC/DC converter comprises an inductorL 1InductorL 2Switch tube S1Switch tube S2The passive buffer circuit comprises a diode D1Diode D2Diode D3Diode D4Diode D5Diode D6Capacitor and method for manufacturing the sameC 1Capacitor and method for manufacturing the sameC 2InductorL S1InductorL S2The first voltage multiplying unit comprises a diode D7Diode D8Capacitor and method for manufacturing the sameC 1aCapacitor and method for manufacturing the sameC 1bThe second voltage multiplying unit comprises a diode D9Diode D10Capacitor and method for manufacturing the sameC 2aCapacitor and method for manufacturing the sameC 2b。
InductanceL 1One terminal and a DC power supplyEIs connected with the other end of the switch tube S1Drain electrode, diode D1And connecting the anode.
InductanceL 2One terminal and a DC power supplyEIs connected with the other end of the switch tube S2Drain electrode, diode D6The cathode is connected.
Switch tube S1The source electrodes are respectively connected with a switch tube S2Source, diode D3Cathode, diode D7Cathode, DC power supplyEIs connected to the negative electrode of (1).
Diode D2Anodes respectively connected to the diodes D1Cathode, diode D5Cathode and capacitorC 1Is connected to a capacitor C1The other end of the diode D is respectively connected with the diode D5Anode, diode D6Cathode and capacitorC 2One end of (A)Connection, capacitanceC 2The other end of the diode D is respectively connected with the diode D3Anode, diode D4Cathode, diode D6And connecting the anode.
Capacitor with a capacitor elementC 1aOne end of each of the two diodes is connected with a diode D2Cathode, diode D8Cathode, diode D10And connecting the anode.
Capacitor with a capacitor elementC 1aThe other end is respectively connected with the inductorL S1One terminal and capacitorC 1bIs connected to one end of an inductorL S1The other end of the switch tube S1Drain electrode connection, capacitorC 1bThe other end of the diode D is respectively connected with the diode D4Anode, diode D7Anode, diode D9The cathode is connected.
Capacitor with a capacitor elementC 2aAnd a diode D10Cathode connection, capacitanceC 2aThe other end of each of the first and second inductors is connected to the inductorL S2One terminal of (1), a capacitor C2bIs connected to one end of an inductorL S2The other end of the switch tube S2Drain electrode connection of, capacitorC 2bAnother terminal of (1) and a diode D9And connecting the anode.
Further, the switch tube S1And a switching tube S2By adopting a staggered control strategy, a switch tube S1And a switching tube S2Are 180 deg. out of phase.
The invention has the beneficial effects that:
1) by adding auxiliary circuits, the switching tube S is enabled1、S2Soft switching is realized, the switching-on and switching-off loss is reduced, and the working efficiency of the converter is improved;
2) the passive buffer circuit and the topological structure of the invention are simpler, the cost is low, and the control strategy and the performance of the original converter are not influenced.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a circuit diagram of an interleaved parallel ZVZCS high boost DC/DC converter.
Fig. 2 is a circuit diagram of a high-gain DC/DC converter based on a voltage gain unit.
FIG. 3 switching tube S1、S2Driving signal waveform diagram of (1).
FIG. 4 shows a switching tube S1、S2Voltage and current waveforms.
FIG. 5 shows a switching tube S1The voltage and current waveforms of (a) are enlarged.
FIG. 6 shows a switching tube S2The voltage and current waveforms of (a) are enlarged.
FIG. 7 shows an inductorL 1、L 2、L S1、L S2A current waveform diagram.
FIG. 8 shows a capacitorC 1、C 2、C 1a、C 1b、C 2a、C 2bVoltage waveform diagram of (2).
Detailed Description
As shown in FIG. 1, an interleaved ZVZCS high boost DC/DC converter comprises an inductorL 1InductorL 2Switch tube S1Switch tube S2The passive buffer circuit comprises a diode D1Diode D2Diode D3Diode D4Diode D5Diode D6Capacitor and method for manufacturing the sameC 1Capacitor and method for manufacturing the sameC 2InductorL S1InductorL S2The first voltage multiplying unit comprises a diode D7Diode D8Capacitor and method for manufacturing the sameC 1aCapacitor and method for manufacturing the sameC 1bThe second voltage multiplying unit comprises a diode D9Diode D10Capacitor and method for manufacturing the sameC 2aCapacitor and method for manufacturing the sameC 2b。
InductanceL 1One terminal and a DC power supplyEIs connected with the other end of the switch tube S1Drain electrode, diode D1And connecting the anode.
InductanceL 2One terminal and a DC power supplyEIs connected with the other end of the switch tube S2Drain electrode, diode D6The cathode is connected.
Switch tube S1The source electrodes are respectively connected with a switch tube S2Source, diode D3Cathode, diode D7Cathode, DC power supplyEIs connected to the negative electrode of (1).
Diode D2Anodes respectively connected to the diodes D1Cathode, diode D5Cathode and capacitorC 1Is connected to one end of a capacitorC 1The other end of the diode D is respectively connected with the diode D5Anode, diode D6Cathode and capacitorC 2Is connected to one end of a capacitorC 2The other end of the diode D is respectively connected with the diode D3Anode, diode D4Cathode, diode D6And connecting the anode.
Capacitor with a capacitor elementC 1aOne end of each of the two diodes is connected with a diode D2Cathode, diode D8Cathode, diode D10And connecting the anode.
Capacitor with a capacitor elementC 1aThe other end is respectively connected with the inductor LS1One terminal and capacitorC 1bIs connected to an inductor LS1The other end of the switch tube S1Drain electrode connection, capacitor C1bThe other end of the diode D is respectively connected with the diode D4Anode, diode D7Anode, diode D9The cathode is connected.
Capacitor with a capacitor elementC 2aAnd a diode D10Cathode connection, capacitanceC 2aThe other end of each of the first and second inductors is connected to the inductorL S2One terminal and capacitorC 2bIs connected to one end of an inductorL S2The other end of the switch tube S2Drain electrode connection of, capacitorC 2bAnother terminal of (1) and a diode D9And connecting the anode.
To the switch tube S1And a switching tube S2By adopting a staggered control strategy, a switch tube S1And a switching tube S2Are 180 deg. out of phase.
When the interleaved parallel ZVZCS high-boost DC/DC converter works, the controller is usedControl switch tube S1And a switching tube S2The on and off of the switch are sequentially switched among 4 working states, and the working states are as follows:
mode 1: controller control switch tube S1Turn-off, switch tube S2And conducting. InductanceL 1Discharge, inductanceL 2And (6) charging. Switch tube S1Instant turn-off, inductanceL 1Discharge is started, and a part of current passes through the diode D1Capacitor for supplying powerC 1Charging and reflow switching tube S2The other part is an inductorL S1And a capacitorC 1bCharged and then flows through the diode D4Capacitor and method for manufacturing the sameC 2Flow direction switch tube S2The process capacitanceC 1Capacitor and method for manufacturing the sameC 1bInductorL S1Charging, capacityC 2Discharge, capacitanceC 2The voltage rapidly drops to 0 and the inductance simultaneouslyL S1The current rises rapidly toi L1(ii) a Capacitor with a capacitor elementC 2When the discharge is finished, the capacitorC 1The voltage has not risen tou C1bThus, the inductanceL S1The voltage at the right end is higher than that at the left end,i LS1current will drop, capacitanceC 1Continuing charging untilu C1=u C1bAfter, current flowi LS1Rise to againi L1. The process inductorL S2Reverse charging, inductanceL S1The current first falls and then risesi L1CapacitorC 1b、C 2aRise in voltage, capacitanceC 1aThe voltage drops. The mode switching tube S1Zero voltage turn-off is achieved when turning off.
Mode 2: controller control switch tube S1Conducting, switching tube S2And conducting. InductanceL 1、L 2And (6) charging. Switch tube S1At the moment of conduction due to inductanceL S1Current cannot change suddenly, inductanceL S1Will discharge from the original circuit, the inductanceL S1Current, inductanceL S2The current drops rapidly to 0 and,switch tube S at this time1Zero current switching-on is realized. InductanceL S1InductorL S2Through inductorL S1Capacitor and method for manufacturing the sameC 1aCapacitor and method for manufacturing the sameC 2aInductorL S2Switch tube S2Switch tube S1Formed branch circuit and inductorL S1Capacitor and method for manufacturing the sameC 1bDiode D7Switch tube S1The formed branch is discharged; at this time due to the capacitanceC 1Voltage greater than capacitanceC 1aVoltage, capacitanceC 1Will pass through the diode D2Capacitor and method for manufacturing the sameC 1aTo the inductanceL S1Reverse charging, at this time the capacitorC 1、C 1aDiode D2And an inductorL S1Forming a resonant cell up to the inductorL S1The current drops to 0, at which time the capacitorC 1Voltage less than capacitanceC 1aA voltage.
Modality 3: controller control switch tube S1Conducting, switching tube S2And (6) turning off. InductanceL 1Charging inductorL 2And (4) discharging. Switch tube S2At the moment of turn-off, the capacitanceC 2Charging, switching tube S2Zero voltage turn-off is achieved. Capacitor asC 2Voltage rises tou C1+u C2=u C1aTime, capacitanceC 1Beginning of discharge, inductanceL S1Starting reverse charging, inductanceL 2Part of the current passes through the capacitorC 2Diode D3Return to the direct current powerENegative electrode, another part passing through capacitorC 1Diode D2Capacitor for supplying powerC 1aCharging, passing through the inductorL S1Reflux switch tube S1CapacitorC 1Discharge, voltageu C1+u C2Rising first and then falling, currenti LS1Rising first and then falling back until reaching the capacitorC 1The discharge is finishedu C1=0, inductance at this timeL 2Beginning to feed inductorL S1Charging, capacityC 2Voltage ofu C2<u C1aCapacitorC 2Will continue to charge whenu C2Rise tou C1aWhen the temperature of the water is higher than the set temperature,i LS1no longer dropping, capacitanceC 2Continuing to charge to voltageu C2>u C1aElectric current ofi LS1Starting to rise again until the capacitanceC 2After the charging is finished, at this timei LS1=-i L2CapacitorC 2No longer charging, inductanceL 2A part of the current starts to pass through the inductorL S2Capacitor for supplying powerC 2bCharging, then passing through a capacitorC 1bFlow direction inductorL S1And flows back to the switching tube S1InductanceL 2Another part of the current passes through the diode D5、D2Capacitor for supplying powerC 1aCharging untili LS2Rise toi L2. The process inductorL S2Capacitor and method for manufacturing the sameC 1aAndC 2bcharging, capacityC 1bDischarge whenu C2b=u C1a+u C1bTime, diode D8Conduction, inductanceL 2Part of the current passes through the inductorL S2Flows through the diode D8Capacitor and method for manufacturing the sameC 1aInductance is givenL S1Charging and then flowing back to the switch tube S1InductanceL 2Another part of the current starts to pass through the inductorL S2Capacitor for supplying powerC 2bCharging is performed through a capacitorC 1bFlow direction inductorL S1And flows back to the switching tube S1。
Modality 4: controller control switch tube S1Conducting, switching tube S2And conducting. InductanceL 1、L 2And (6) charging. Switch tube S2At the moment of conduction due to inductanceL S2Current cannot change suddenly, inductanceL S2Will discharge from the original circuit, the inductanceL S1Current, inductanceL S2The current rapidly drops to 0. Switch tube S at this time2Realize zeroThe current is switched on. InductanceL S1InductorL S2Through inductorL S2Capacitor and method for manufacturing the sameC 2bCapacitor and method for manufacturing the sameC 1bInductorL S1Switch tube S1Formed branch circuit and inductorL S2Diode D8Capacitor and method for manufacturing the sameC 1aInductorL S1Switch tube S1The formed branch is discharged; capacitor at this timeC 2Voltage greater than capacitanceC 1bVoltage, capacitanceC 2Through a switching tube S2Switch tube S1InductorL S1Capacitor and method for manufacturing the sameC 1aAnd a diode D4To the inductorL S1Charging, at the moment the capacitorC 2Capacitor and method for manufacturing the sameC 1bDiode D4And an inductorL S1Forming a resonant cell up to the inductorL S1The current drops to 0, at which time the capacitorC 2Voltage less than capacitanceC 1bA voltage.
In one embodiment, the high-gain DC/DC converter based on the voltage gain unit is simulated, and the simulation parameters are as follows: all switching tube frequenciesf=50kHz, switching tube S1、S2Duty cycleD=0.7, direct current power supplyEVoltage ofu in =30V, output voltageu 0 =400V, rated powerP 0 = 1600W. FIG. 3 shows a switching tube S1Drive signal U ofS1GSAnd a switching tube S2Drive signal U ofS2GSVoltage waveform of (2). Fig. 4-6 show a switching tube S1、S2Voltage, current waveform of (1), whereini S1Is a switch tube S1The drain current of (a) is measured,i S2is a switch tube S2The drain current of (a) is measured,u S1is a switch tube S1The voltage of the drain of (a) is,u S2is a switch tube S2Is shown, the switching tube S1、S2Zero voltage turn-off and zero current turn-on are both achieved. FIG. 7 shows an inductorL 1Current ofi L1InductorL 2Current ofi L2InductorL S1Current ofi LS1InductorL S2Current ofi LS2The waveform of (2). FIG. 8 shows a capacitorC 1、C 2、C 1a、C 1b、C 2a、C 2bVoltage waveform of (2).

Claims (2)

1. The interleaved ZVZCS high-boost DC/DC converter is characterized by comprising an inductorL 1InductorL 2Switch tube S1Switch tube S2The passive buffer circuit comprises a diode D1Diode D2Diode D3Diode D4Diode D5Diode D6Capacitor and method for manufacturing the sameC 1Capacitor and method for manufacturing the sameC 2InductorL S1InductorL S2The first voltage multiplying unit comprises a diode D7Diode D8Capacitor and method for manufacturing the sameC 1aCapacitor and method for manufacturing the sameC 1bThe second voltage multiplying unit comprises a diode D9Diode D10Capacitor and method for manufacturing the sameC 2aCapacitor and method for manufacturing the sameC 2b；
InductanceL 1One terminal and a DC power supplyEIs connected with the other end of the switch tube S1Drain electrode, diode D1Connecting an anode;
inductanceL 2One terminal and a DC power supplyEIs connected with the other end of the switch tube S2Drain electrode, diode D6Connecting a cathode;
switch tube S1The source electrodes are respectively connected with a switch tube S2Source, diode D3Cathode, diode D7Cathode, DC power supplyEThe negative electrode of (1) is connected;
diode D2Anodes respectively connected to the diodes D1Cathode, diode D5Cathode and capacitorC 1Is connected to one end of a capacitorC 1The other end of the diode D is respectively connected with the diode D5Anode, diode D6Cathode and capacitorC 2Is connected to one end of a capacitorC 2The other end of the diode D is respectively connected with the diode D3Anode, diode D4Cathode, diode D6Connecting an anode;
capacitor with a capacitor elementC 1aOne end of each of the two diodes is connected with a diode D2Cathode, diode D8Cathode, diode D10Connecting an anode;
capacitor with a capacitor elementC 1aThe other end is respectively connected with the inductorL S1One terminal and capacitorC 1bIs connected to one end of an inductorL S1The other end of the switch tube S1Drain electrode connection, capacitorC 1bThe other end of the diode D is respectively connected with the diode D4Anode, diode D7Anode, diode D9Connecting a cathode;
capacitor with a capacitor elementC 2aAnd a diode D10Cathode connection, capacitanceC 2aThe other end of each of the first and second inductors is connected to the inductorL S2One terminal and capacitorC 2bIs connected to one end of an inductorL S2The other end of the switch tube S2Drain electrode connection of, capacitorC 2bAnother terminal of (1) and a diode D9Connecting an anode;
when the interleaved ZVZCS high-boost DC/DC converter works, the switching tube S is controlled by the controller1And a switching tube S2The on and off of the switch are sequentially switched among 4 working states, and the working states are as follows:
mode 1: controller control switch tube S1Turn-off, switch tube S2Conducting; inductanceL 1Discharge, inductanceL 2Charging; switch tube S1Instant turn-off, inductanceL 1Discharge is started, and a part of current passes through the diode D1Capacitor for supplying powerC 1Charging and reflow switching tube S2The other part is an inductorL S1And a capacitorC 1bCharged and then flows through the diode D4Capacitor and method for manufacturing the sameC 2Flow direction switch tube S2The process capacitanceC 1Capacitor and method for manufacturing the sameC 1bInductorL S1Charging, capacityC 2Discharge, capacitanceC 2The voltage rapidly drops to 0 and the inductance simultaneouslyL S1The current rises rapidly toi L1(ii) a Capacitor with a capacitor elementC 2When the discharge is finished, the capacitorC 1The voltage has not risen tou C1bInductanceL S1The voltage at the right end is higher than that at the left end,i LS1current will drop, capacitanceC 1Continuing charging untilu C1=u C1bAfter, current flowi LS1Rise to againi L1(ii) a The process inductorL S2Reverse charging, inductanceL S1The current first falls and then risesi L1CapacitorC 1b、C 2aRise in voltage, capacitanceC 1aVoltage drop; the mode switching tube S1Zero voltage turn-off is realized when the switch-off is carried out;
mode 2: controller control switch tube S1Conducting, switching tube S2Conducting; inductanceL 1、L 2Charging; switch tube S1At the moment of conduction due to inductanceL S1Current cannot change suddenly, inductanceL S1Will discharge from the original circuit, the inductanceL S1Current, inductanceL S2The current rapidly drops to 0, at which time the switch tube S1Zero current switching-on is realized; inductanceL S1InductorL S2Through inductorL S1Capacitor and method for manufacturing the sameC 1aCapacitor and method for manufacturing the sameC 2aInductorL S2Switch tube S2Switch tube S1Formed branch circuit and inductorL S1Capacitor and method for manufacturing the sameC 1bDiode D7Switch tube S1The formed branch is discharged; at this time due to the capacitanceC 1Voltage greater than capacitanceC 1aVoltage, capacitanceC 1Will pass through the diode D2Capacitor and method for manufacturing the sameC 1aTo the inductanceL S1Reverse charging, at this time the capacitorC 1、C 1aDiode D2And an inductorL S1Forming a resonant cell up to the inductorL S1The current drops to 0, at which time the capacitorC 1Voltage less than capacitanceC 1aA voltage;
modality 3: controller control switch tube S1Conducting, switching tube S2Turning off; inductanceL 1Charging inductorL 2Discharging; switch tube S2At the moment of turn-off, the capacitanceC 2Charging, switching tube S2Zero voltage turn-off is realized; capacitor asC 2Voltage rises tou C1+u C2=u C1aTime, capacitanceC 1Beginning of discharge, inductanceL S1Starting reverse charging, inductanceL 2Part of the current passes through the capacitorC 2Diode D3Return to the direct current powerENegative electrode, another part passing through capacitorC 1Diode D2Capacitor for supplying powerC 1aCharging, passing through the inductorL S1Reflux switch tube S1CapacitorC 1Discharge, voltageu C1+u C2Rising first and then falling, currenti LS1Rising first and then falling back until reaching the capacitorC 1The discharge is finishedu C1=0, inductance at this timeL 2Beginning to feed inductorL S1Charging, capacityC 2Voltage ofu C2<u C1aCapacitorC 2Will continue to charge whenu C2Rise tou C1aWhen the temperature of the water is higher than the set temperature,i LS1no longer dropping, capacitanceC 2Continuing to charge to voltageu C2>u C1aElectric current ofi LS1Starting to rise again until the capacitanceC 2After the charging is finished, at this timei LS1=-i L2CapacitorC 2No longer charging, inductanceL 2A part of the current starts to pass through the inductorL S2Capacitor for supplying powerC 2bCharging, then passing through a capacitorC 1bFlow direction inductorL S1Back to the flowSwitch tube S1InductanceL 2Another part of the current passes through the diode D5、D2Capacitor for supplying powerC 1aCharging untili LS2Rise toi L2(ii) a The process inductorL S2Capacitor and method for manufacturing the sameC 1aAndC 2bcharging, capacityC 1bDischarge whenu C2b=u C1a+u C1bTime, diode D8Conduction, inductanceL 2Part of the current passes through the inductorL S2Flows through the diode D8Capacitor and method for manufacturing the sameC 1aInductance is givenL S1Charging and then flowing back to the switch tube S1InductanceL 2Another part of the current starts to pass through the inductorL S2Capacitor for supplying powerC 2bCharging is performed through a capacitorC 1bFlow direction inductorL S1And flows back to the switching tube S1；
Modality 4: controller control switch tube S1Conducting, switching tube S2Conducting; inductanceL 1、L 2Charging; switch tube S2At the moment of conduction due to inductanceL S2Current cannot change suddenly, inductanceL S2Will discharge from the original circuit, the inductanceL S1Current, inductanceL S2The current rapidly drops to 0; switch tube S at this time2Zero current switching-on is realized; inductanceL S1InductorL S2Through inductorL S2Capacitor and method for manufacturing the sameC 2bCapacitor and method for manufacturing the sameC 1bInductorL S1Switch tube S1Formed branch circuit and inductorL S2Diode D8Capacitor and method for manufacturing the sameC 1aInductorL S1Switch tube S1The formed branch is discharged; capacitor at this timeC 2Voltage greater than capacitanceC 1bVoltage, capacitanceC 2Through a switching tube S2Switch tube S1InductorL S1Capacitor and method for manufacturing the sameC 1aAnd a diode D4To the inductorL S1Charging, at the moment the capacitorC 2Capacitor and method for manufacturing the sameC 1bDiode D4And an inductorL S1Forming a resonant cell up to the inductorL S1The current drops to 0, at which time the capacitorC 2Voltage less than capacitanceC 1bA voltage.
2. The interleaved ZVZCS high boost DC/DC converter according to claim 1 wherein S is a pair of switching tubes1And a switching tube S2By adopting a staggered control strategy, a switch tube S1And a switching tube S2Are 180 deg. out of phase.
CN201910351270.XA 2019-04-28 2019-04-28 Staggered parallel ZVZCS high-boost DC/DC converter Active CN110034681B (en)

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