CN109104092B - Low switch tube voltage stress current type output resonant converter - Google Patents

Low switch tube voltage stress current type output resonant converter Download PDF

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Publication number
CN109104092B
CN109104092B CN201811136419.4A CN201811136419A CN109104092B CN 109104092 B CN109104092 B CN 109104092B CN 201811136419 A CN201811136419 A CN 201811136419A CN 109104092 B CN109104092 B CN 109104092B
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capacitor
resonant
inductor
diode
inductance
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CN109104092A (en
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顾玲
向园祉
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • 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

The invention provides a low-switching-tube voltage stress current type output resonant converter, which comprises an isolation transformer, a primary side circuit and a secondary side circuit, wherein the isolation transformer is connected with the primary side circuit; one end of a first resonant inductor of the primary side circuit is connected with the positive end of a direct-current power supply, the other end of the first resonant inductor is connected with one end of an excitation inductor and the same-name end of the primary side of a transformer, the other end of the excitation inductor is connected with the different-name end of the primary side of the transformer, one end of a first resonant capacitor, one end of a second resonant inductor and the drain electrode of a switching tube, the other end of the second resonant inductor is connected with one end of a second resonant capacitor, and the source electrode of the switching tube, one end of the first resonant capacitor and the other; the secondary different-name end of the transformer of the secondary circuit is connected with one end of a blocking capacitor, the other end of the blocking capacitor is connected with the cathode of a diode, one end of a third resonant capacitor and one end of an output filter inductor, the other end of the output filter inductor is connected with the positive end of an output filter capacitor, and the like end of the secondary side of the transformer, the anode of the diode and the other end of the third resonant capacitor are connected with the negative end of the output capacitor.

Description

Low switch tube voltage stress current type output resonant converter
Technical Field
The invention relates to a resonant converter technology, in particular to a low-switching-tube voltage stress current type output resonant converter.
Background
The development trend of modern power electronic technology is high frequency, high power, modularization and intellectualization, and the high frequency of power electronic equipment can meet the requirements of small volume, light weight, high power density and the like. For hard switching circuits, however, increasing the switching frequency results in increased switching losses, which greatly reduces the overall efficiency of the converter. Therefore, the soft switching technology comes from the beginning, the switching frequency can be improved, meanwhile, the switching loss is not increased, and the advantage also represents the importance of the deep research on the technology.
The most typical converter for implementing soft switching technology is a resonant converter, which is implemented by using the resonance of an inductor and a capacitor. The resonant converter mainly comprises a quasi-resonant converter, a multi-resonant converter and a resonant converter. The quasi-resonant converter and the multi-resonant converter are both single-tube converters, and the control is simple. The zero voltage switch quasi-resonant converter has high voltage stress, and the switching conditions of a diode and a switching tube in a circuit can be improved by one of the diode and the switching tube; and the zero-voltage switching multi-resonant converter can improve the switching conditions of two devices at the same time. The zero-voltage switch multi-resonant converter is divided into an isolated type and a non-isolated type, wherein the non-isolated type mainly comprises Buck, Boost, Buck/Boost, Cuk, Sepic and Zeta zero-voltage switch multi-resonant converters, and the isolated type mainly comprises Forward, Flyback, Cuk, Speic and Zeta zero-voltage switch multi-resonant converters. The isolated zero-voltage switch multi-resonant converter can absorb leakage inductance of a transformer as a part of resonant inductance, and absorb junction capacitance of a switch tube and a diode as a part of resonant capacitance, so that the problem that parasitic parameters are obviously influenced under high-frequency work is solved, but the traditional isolated zero-voltage switch multi-resonant converter still has the problem that voltage stress of the switch tube is high.
Disclosure of Invention
The invention aims to provide a low-switching tube voltage stress current type output resonant converter which comprises an isolation type and a non-isolation type.
One technical scheme for achieving the purpose of the invention is as follows: a low switching tube voltage stress isolation type current type output resonant converter comprises an isolation transformer, a primary side circuit and a secondary side circuit, wherein the primary side circuit comprises a direct current power supply, a first resonant inductor, an excitation inductor, a switching tube, a first resonant capacitor, a second resonant inductor and a second resonant capacitor, and the secondary side circuit comprises a blocking capacitor, a diode, a third resonant capacitor, an output filter inductor and an output filter capacitor; one end of a first resonant inductor is connected with the positive end of a direct-current power supply, the other end of the first resonant inductor is connected with one end of an excitation inductor and the dotted end of the primary side of a transformer, the other end of the excitation inductor is connected with the dotted end of the primary side of the transformer, one end of a first resonant capacitor, one end of a second resonant inductor and the drain electrode of a switching tube, the other end of the second resonant inductor is connected with one end of a second resonant capacitor, and the source electrode of the switching tube, the other end of the first resonant capacitor and the other end of the second resonant capacitor are connected with the negative end of the direct-current power supply; the synonym end of the secondary side of the transformer is connected with one end of a blocking capacitor, the other end of the blocking capacitor is connected with the cathode of a diode, one end of a third resonant capacitor and one end of an output filter inductor, the other end of the output filter inductor is connected with the positive end of the output filter capacitor, and the synonym end of the secondary side of the transformer, the anode of the diode and the other end of the third resonant capacitor are connected with the negative end of the output capacitor.
By adopting the resonant converter, the switch tube is connected with a parasitic body diode in parallel, the anode of the parasitic body diode is connected with the source electrode of the switch tube, and the cathode of the parasitic body diode is connected with the drain electrode of the switch tube.
By adopting the resonant converter, the capacity of the first resonant capacitor is equivalent to the sum of the capacitance of the junction of the switching tube and the capacitance of the resonant capacitor connected between the source electrode and the drain electrode of the switching tube in parallel; the capacity of the third resonance capacitor is equivalent to the sum of the capacity of a diode junction capacitor and the capacity of a resonance capacitor connected between two electrodes of the diode in parallel; the first resonance inductance value is equivalent to the sum of the resonance inductance value connected with the transformer in series and the leakage inductance of the transformer.
The second technical scheme for realizing the aim of the invention is as follows: a non-isolation type current type output resonant converter with low switching tube voltage stress comprises a direct current power supply, a first resonant inductor, an energy storage inductor, a switching tube, a first resonant capacitor, a second resonant inductor and a second resonant capacitor, wherein a secondary side circuit comprises a blocking capacitor, a diode, a third resonant capacitor, an output filter inductor and an output filter capacitor; one end of the first resonant inductor is connected with the positive end of the direct-current power supply, the other end of the first resonant inductor is connected with one end of the energy storage inductor, one end of the blocking capacitor, the other end of the blocking capacitor is connected with the anode of the diode, one end of the third resonant capacitor and one end of the output filter inductor, the other end of the output filter inductor is connected with the negative end of the output filter capacitor, the other end of the third resonant capacitor, the cathode of the diode, the other end of the energy storage inductor, the drain electrode of the switching tube, one end of the second resonant capacitor and one end of the second resonant inductor are connected with the positive end of the output filter capacitor, the other end of the second resonant inductor is connected with one end of the second resonant capacitor, the other end of the first resonant capacitor, the other end of the second resonant capacitor and the source electrode of the switching tube are connected with the negative.
By adopting the resonant converter, the switch tube is connected with a parasitic body diode in parallel, the anode of the parasitic body diode is connected with the source electrode of the switch tube, and the cathode of the parasitic body diode is connected with the drain electrode of the switch tube.
By adopting the resonant converter, the capacity of the first resonant capacitor is equivalent to the sum of the capacitance of the junction of the switching tube and the capacitance of the resonant capacitor connected between the source electrode and the drain electrode of the switching tube in parallel; and the capacity of the third resonant capacitor is equivalent to the sum of the capacity of a diode junction capacitor and the capacity of a resonant capacitor connected in parallel between two electrodes of the diode.
Compared with the prior art, the invention has the following advantages:
(1) due to the existence of the output filter inductor, the low-switching tube voltage stress current type output resonant converter reduces the filter capacitor required when meeting the same output voltage ripple requirement, and is suitable for low-voltage heavy current output; (2) the low-switching-tube voltage stress current type output resonant converter can simultaneously realize zero-voltage switching-on of a switching tube and zero-current switching-off of a diode, and compared with the existing multi-resonant converter, the low-switching-tube voltage stress current type output resonant converter can reduce the voltage stress of the switching tube, has smaller conduction loss and higher efficiency; (3) the invention relates to a low-switch tube voltage stress current type output resonant converter which comprises a low-switch tube voltage stress non-isolated current type output resonant converter and a low-switch tube voltage stress isolated current type output resonant converter, wherein the low-switch tube voltage stress isolated current type output resonant converter can be selected in the application occasions needing electrical isolation, and the low-switch tube voltage stress non-isolated current type output resonant converter can be selected in the application occasions needing no electrical isolation and needing input and output voltage reversal; (4) the voltage stress of the switching tube is reduced by the connection mode of the transformer and the resonance circuit consisting of the resonance inductor and the resonance capacitor; (5) the low-switching-tube voltage stress current type output resonant converter absorbs the junction capacitance of the switching tube and the junction capacitance of the diode as a part of the resonant capacitor, so that the problem that the influence of parasitic parameters under high-frequency work is obvious is solved, and the efficiency of the converter is improved.
The invention is further described below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic circuit diagram of a low switching tube voltage stress isolation type current mode output resonant converter.
Fig. 2 is a schematic circuit diagram of a non-isolated current mode output resonant converter with low switching tube voltage stress.
FIG. 3 is a schematic diagram of an equivalent circuit of a low-switching-tube voltage stress current type output resonant converter
Fig. 4 is a schematic diagram of main waveforms of the low switching tube voltage stress isolation type current mode output resonant converter in the first operating mode.
Fig. 5 is a schematic diagram of an equivalent circuit structure of the switching mode 1 in the first operation mode of the present invention.
Fig. 6 is a schematic diagram of an equivalent circuit structure of the switching mode 2 in the first operating mode and the switching mode 2 in the second operating mode.
Fig. 7 is a schematic diagram of an equivalent circuit structure of the switching mode 3 in the first operating mode and the switching modes 1 and 3 in the second operating mode of the present invention.
Fig. 8 is a schematic diagram of an equivalent circuit structure of the switching mode 4 in the first operating mode and the switching mode 4 in the second operating mode of the present invention.
Fig. 9 is a schematic diagram of main waveforms of the low switching tube voltage stress isolation type current mode output resonant converter in the second operating mode.
The reference numbers in the figures illustrate: input voltage VinFirst resonant inductor LsExcitation inductance Lm(fig. 2 energy storage inductor), switch tube S, switch tube parasitic body diode DsFirst resonant capacitor CsSecond resonant capacitor CrSecond resonant inductor LrIsolation transformer TrDc blocking capacitor CbDiode D, third resonant capacitor CdOutput filter capacitor CoOutput filter inductance LfInput current IinOutput current IoOutput voltage VoGate source drive voltage v of switching tubegsDrain-source voltage v of switching tubesVoltage v across the diodedFirst resonant inductor current iLSecond resonant inductor current irVoltage v across the second resonant capacitorr。
Detailed Description
Referring to fig. 1, a low switching tube voltage stress isolation type current mode output resonant converter includes a dc power supply VinA first resonant inductor LsAnd an excitation inductor LmSwitch tube S and first resonant capacitor CsA second resonant capacitor CrA second resonant inductor LrIsolation transformer TrDiode D and DC blocking capacitor CbA third resonant capacitor CdAn output filter inductor LfAn output filter capacitor Co。
First resonant inductor LsOne end of (1) and a DC power supply VinThe positive terminal is connected with the first resonant inductor LsThe other end and an excitation inductor LmOne end of (1), transformer TrThe same-name ends of the primary side are connected, and an excitation inductor LmThe other end of the transformer and the transformer TrPrimary-side synonym terminal, S drain electrode of switching tube and first resonant capacitor CsOne terminal of (1), a second resonant inductor LrIs connected to one end of a second resonant inductor LrAnd the other end of the first resonant capacitor CrIs connected with the source of the switching tube S and the first resonant capacitor CsThe other end of the first resonant capacitor CrThe other end of the DC power supply VinIs connected to the negative terminal of the transformer TrSynonym terminal and blocking capacitor C of secondary sidebIs connected with one end of a DC blocking capacitor CbThe other end of the diode D, a cathode of the diode D and a third resonant capacitor CdOne end of, output filter inductance LfIs connected with one end of the output filter inductor LfAnother end of (1) and an output filter capacitor CoIs connected with the positive terminal of the transformer TrThe dotted terminal of the secondary side, the anode of the diode D and the third resonant capacitor CdThe other end of (1) and an output capacitor CoIs connected to the negative terminal. Wherein, the switch tube S comprises a switch tube parasitic body diode D connected in parallel between the drain electrode and the source electrode thereofsFirst resonant capacitor CsComprises a junction capacitor of the switch tube S, a capacitor additionally connected in parallel at two ends of the switch tube S, and a third resonance capacitor CdComprising a junction capacitor of the diode D itself and additionally connected in parallel across the diode DThe capacitance of (c).
Referring to fig. 2, a non-isolated current mode output resonant converter with low switching tube voltage stress includes a dc power supply VinA first resonant inductor LsEnergy storage inductor LmSwitch tube S and first resonant capacitor CsA second resonant capacitor CrA second resonant inductor LrDiode D and DC blocking capacitor CbA third resonant capacitor CdAn output filter inductor LfAn output filter capacitor Co。
First resonant inductor LsOne end of (1) and a DC power supply VinIs connected with the positive terminal of the first resonant inductor LsAnother end of (1) and an energy storage inductor LmOne end of (C), a DC blocking capacitor CbIs connected with one end of a DC blocking capacitor CbAnd the other end of the diode D, the anode of the diode D and a third resonant capacitor CdOne end of, output filter inductance LfIs connected with one end of the output filter inductor LfAnother end of (1) and an output filter capacitor CoIs connected to the negative terminal of the third resonant capacitor CdAnother end of the diode D, a cathode of the diode D, and an energy storage inductor LmThe other end of the first resonant capacitor C, the drain electrode of the switching tube S and the first resonant capacitor CsOne terminal of (1), a second resonant inductor LrOne end of and an output filter capacitor CoIs connected with the positive terminal of the second resonant inductor LrAnd the other end of the first resonant capacitor CrIs connected to the first resonant capacitor CsThe other end of the first resonant capacitor CrThe other end of the switch tube S, the source electrode of the switch tube S and a direct current power supply VinIs connected to the negative terminal.
The low switching tube voltage stress non-isolated current mode output resonant converter in fig. 2 is similar to the low switching tube voltage stress isolated current mode output resonant converter in fig. 1 in operation principle, except that the low switching tube voltage stress isolated current mode output resonant converter can absorb the leakage inductance of the isolation transformer as a part of the resonant inductance; both can absorb the junction capacitance of the switching tube and the junction capacitance of the diode as a part of the resonance capacitance, and can solve the problem that the influence of parasitic parameters under high-frequency work is obvious; the low-switching tube voltage stress isolation type current mode output resonant converter can be selected in the application occasions needing electrical isolation, and the low-switching tube voltage stress non-isolation type current mode output resonant converter can be selected in the application occasions needing no electrical isolation; in addition, compared with the traditional multi-resonant converter, the resonant network of the low-switching-tube voltage stress voltage type output resonant converter can obviously improve the problem of high voltage stress of the switching tube.
Specific working principles of the low switching tube voltage stress current type output resonant converter are described with reference to fig. 4 to 9, wherein the working principles of the isolated type and the non-isolated type are the same. The converter has two operation modes, and the corresponding main operation waveforms are respectively shown in fig. 4 and fig. 9.
Before performing the analysis, the following assumptions were made: (1) all inductors, capacitors and transformers are ideal elements;
(2) blocking capacitor CbSufficiently large to be approximately considered as a voltage source Vo(ii) a (3) Excitation inductance LmIs large enough to be approximately considered as a current source Iin，IinIs the input current; (4) output filter inductance LfIs large enough to be approximately considered as a current source Io，IoIs an output current; (5) assume a transformer turn ratio of 1: 1.
Example one
From fig. 3, it can be seen that the converter has 4 switching modes in the operating mode 1, each of which is t0，t1]、[t1，t2]、[t2，t3]、[t3，t4]The corresponding switching modes are fig. 5 to 8. The working conditions of the switching modes are specifically analyzed below.
1. Switched mode 1[ t ]0，t1]
The equivalent circuit of the switching mode is shown in FIG. 5, the switching tube S is in the on state, t0Time of day, third resonant capacitor CdVoltage v acrossdResonant to zero, third resonant capacitor CdIn the fully discharged state, the diode D is conducted, and the inductive current i is in the switching modeLIs linearly raised, wherein
Figure BDA0001814796960000061
Now only the second resonant inductor LrA second resonant capacitor CrInternal resonance, external voltage is zero.
2. Switched mode 2[ t ]1，t2]
The equivalent circuit of the switching mode is shown in fig. 6, where the diode D is in a conducting state, t1At the moment, the switch tube S is turned off, and the first resonant capacitor C is turned off at the momentsA first resonant inductor LsA second resonant inductor LrA second resonant capacitor CrParticipating in resonance, a first resonant capacitor CsThe voltage across the switch tube S (i.e. the voltage v across the switch tube S)s) The resonance rises.
3. Switching mode 3[ t ]2，t3]
The equivalent circuit of the switching mode is shown in fig. 7, where the switching tube S is in an off state, t2At time, the first resonant inductor current iLIs reduced to Iin-IoAt this time, the third resonant capacitor CdWhen the current starts to flow, the diode D is turned off with zero current, and the first resonant capacitor CsA first resonant inductor LsA second resonant inductor LrA second resonant capacitor CrA third resonant capacitor CdBoth participate in resonance. Third resonant capacitor CdThe voltage across (i.e. the voltage v across the diode D)d) The resonance rises.
4. Switch mode 4[ t ]3，t4]
The equivalent circuit of the switching mode is shown in fig. 8, where the diode D is in the off state, t3At the moment, the first resonant capacitor CsThe voltage at two ends resonates to 0 to realize the zero voltage switching-on and C of the switch tube SsOut of resonance, second resonance inductance L in this switching moderA second resonant capacitor CrA third resonant capacitor CdParticipate in resonance, wherein the second resonance inductance LrA second resonant capacitor CrThe internal resonance realizes energy exchange, and the external voltage is zero. To t4Time of day, thirdResonant capacitor CdVoltage v acrossdThe resonance goes to zero and the diode D conducts back to switching mode 1.
Example two
Unlike mode 1, mode 2 occurs at t0The mode of turning off the switch tube S when the second diode is not turned on is shown in fig. 8. From fig. 9, it can be seen that the converter has 4 switching modes in the operating mode 2, each switching cycle being [ t [ ]0，t1]、[t1，t2]、[t2，t3]、[t3，t4]. The working conditions of the switching modes are specifically analyzed below.
1. Switched mode 1[ t ]0，t1]
The equivalent circuit of the switching mode is shown in FIG. 7, in which the diode D is in the off state, t0At the moment, the switch tube S is turned off, and the first resonant inductor LsA second resonant inductor LrA first resonant capacitor CsA second resonant capacitor CrAnd a third resonant capacitor CdAll participate in resonance, the first resonance capacitor CsVoltage v acrosssResonant rise, third resonant capacitance CdVoltage v acrossdThe resonance drops.
2. Switched mode 2[ t ]1，t2]
The equivalent circuit of the switching mode is shown in fig. 6, where the switching tube S is in an off state, t1At the moment, the voltage v across the diode DdWhen the resonance reaches 0, the diode D is conducted, and the first resonance inductor L is conducted at the momentsA second resonant inductor LrA second resonant capacitor CrA first resonant capacitor CsParticipate in resonance.
3. Switching mode 3[ t ]2，t3]
The equivalent circuit of the switching mode is shown in fig. 7, where the switching tube S is in an off state, t2At the moment, the first resonant inductance current value is reduced to Iin-IoThe diode D is turned off, and the first resonant capacitor C is turned onsA first resonant inductor LsA second resonant inductor LrA second resonant capacitor CrA third resonant capacitor CdParticipating in resonance, third resonance capacitor CdThe voltage across (i.e. the voltage v across the diode D)d) The resonance rises.
4. Switch mode 4[ t ]3，t4]
The equivalent circuit of the switching mode is shown in fig. 8, where the diode D is in the off state, t3Time of day, CsVoltage V acrosssThe resonance reaches 0 to realize the zero voltage switching-on of the switching tube S, the inductive current rises, and the first resonance inductor LsA second resonant inductor LrA second resonant capacitor CrA third resonant capacitor CdParticipating in resonance in which mode is the second resonance inductance LrA second resonant capacitor CrResonance occurs inside, and the external voltage is zero; t is t4At that time, the switching tube S is turned off and returns to the switching mode 1.

Claims (6)

1. A low switch tube voltage stress isolation type current type output resonant converter is characterized by comprising an isolation transformer, a primary side circuit and a secondary side circuit,
the primary circuit comprises a DC power supply (V)in) A first resonant inductor (L)s) Excitation inductor (L)m) A switch tube (S), a first resonance capacitor (C)s) A second resonant inductor (L)r) A second resonant capacitor (C)r)，
The secondary side circuit comprises a blocking capacitor (C)b) A diode (D), a third resonant capacitor (C)d) An output filter inductor (L)f) An output filter capacitor (C)o)；
First resonant inductance (L)s) And one end of (V) and a DC power supply (V)in) The positive end of the first and second connecting rods is connected,
first resonant inductance (L)s) The other end and an excitation inductor (L)m) One end of (1), transformer (T)r) The same-name ends of the primary side are connected,
excitation inductance (L)m) Another end of (2) and a transformer (T)r) Primary different name terminal, first resonance capacitor (C)s) ToTerminal, second resonant inductance (L)r) One end of the switch tube (S) is connected with the drain electrode of the switch tube (S),
second resonant inductance (L)r) And the other end of the first resonant capacitor (C) and a second resonant capacitor (C)r) The other end of the first and the second connecting rods are connected,
source electrode of switch tube (S), first resonance capacitor (C)s) The other end of (C), a second resonance capacitor (C)r) And the other end of (V) and a direct current power supply (V)in) Is connected with the negative end of the power supply;
transformer (T)r) Synonym terminal and blocking capacitor (C) of secondary sideb) One end of the two ends of the connecting rod is connected,
blocking capacitor (C)b) The other end of the first diode (D), a cathode of the diode (D), and a third resonant capacitor (C)d) One terminal of (1), output filter inductance (L)f) One end of the two ends of the connecting rod is connected,
output filter inductor (L)f) And the other end of the output filter capacitor (C)o) The positive end of the first and second connecting rods is connected,
transformer (T)r) The dotted terminal of the secondary side, the anode of the diode (D), and the third resonant capacitor (C)d) Another terminal of (C) and an output capacitor (C)o) Is connected to the negative terminal.
2. Resonant converter according to claim 1, characterized in that the switching tube (S) is connected in parallel with a parasitic body diode (D)s) Parasitic body diode (D)s) Is connected with the source of the switching tube (S), and a parasitic body diode (D)s) Is connected to the drain of the switching tube (S).
3. The resonant converter of claim 2,
the first resonance capacitor (C)s) The capacity is equivalent to the sum of the capacity of the junction capacitor of the switching tube (S) and the capacity of a resonance capacitor connected between the source electrode and the drain electrode of the switching tube (S) in parallel;
the third resonance capacitor (C)d) The capacity is equivalent to the sum of the capacity of the junction capacitor of the diode (D) and the capacity of a resonance capacitor connected in parallel between the two electrodes of the diode (D);
the first resonant inductance (L)s) Inductance equivalent to transformer (T)r) The sum of the inductance value of the resonance inductor and the leakage inductance of the transformer connected in series.
4. A non-isolated current type output resonant converter with low switching tube voltage stress is characterized by comprising a direct current power supply (V)in) A first resonant inductor (L)s) Energy storage inductor (L)m) A switch tube (S), a first resonance capacitor (C)s) A second resonant inductor (L)r) A second resonant capacitor (C)r) A DC blocking capacitor (C)b) A diode (D), a third resonant capacitor (C)d) An output filter inductor (L)f) An output filter capacitor (C)o) Wherein, in the step (A),
first resonant inductance (L)s) And one end of (V) and a DC power supply (V)in) The positive end of the first and second connecting rods is connected,
first resonant inductance (L)s) The other end and an energy storage inductor (L)m) One terminal of (C), a blocking capacitor (C)b) One end of the two ends of the connecting rod is connected,
blocking capacitor (C)b) The other end of the first diode (D), the anode of the diode (D) and a third resonant capacitor (C)d) One terminal of (1), output filter inductance (L)f) One end of the two ends of the connecting rod is connected,
output filter inductor (L)f) And the other end of the output filter capacitor (C)o) The negative end of the first power supply is connected with the negative end of the second power supply,
cathode of diode (D), third resonance capacitor (C)d) Another end of (1), energy storage inductance (L)m) Another terminal of (C), a first resonance capacitor (C)s) One terminal of (1), the second resonant inductor (L)r) One end of (A), the drain electrode of the switch tube (S) and the output filter capacitor (C)o) The positive end of the first and second connecting rods is connected,
second resonant inductance (L)r) And the other end of the first resonant capacitor (C) and a second resonant capacitor (C)r) The other end of the first and the second connecting rods are connected,
source electrode of switch tube (S), first resonance capacitor (C)s) The other end of (C), a second resonance capacitor (C)r) And the other end of (V) and a direct current power supply (V)in) Is connected to the negative terminal.
5. Root of herbaceous plantA resonant converter according to claim 4, characterized in that the switching tube (S) is connected in parallel with a parasitic body diode (D)s) Parasitic body diode (D)s) Is connected with the source of the switching tube (S), and a parasitic body diode (D)s) Is connected to the drain of the switching tube (S).
6. The resonant converter of claim 5,
the first resonance capacitor (C)s) The capacity is equivalent to the sum of the capacity of the junction capacitor of the switching tube (S) and the capacity of a resonance capacitor connected between the source electrode and the drain electrode of the switching tube (S) in parallel;
the third resonance capacitor (C)d) The capacitance is equivalent to the sum of the capacitance of the junction of the diode (D) and the capacitance of a resonance capacitor connected in parallel between the two electrodes of the diode (D).
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