CN109194140B - Low switch tube voltage stress voltage type output resonant converter - Google Patents

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

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Publication number
CN109194140B
CN109194140B CN201811136390.XA CN201811136390A CN109194140B CN 109194140 B CN109194140 B CN 109194140B CN 201811136390 A CN201811136390 A CN 201811136390A CN 109194140 B CN109194140 B CN 109194140B
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resonant
capacitor
diode
inductor
resonance
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CN109194140A (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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815—Resonant converters
    • 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

Abstract

The invention provides a low-switching-tube voltage stress voltage 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 a 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, the drain electrode of a switching tube, one end of a first resonant capacitor and one end of a second resonant inductor, 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; the same-name end of the secondary side of a transformer of the secondary side circuit is connected with one end of a third resonant capacitor and the anode of a diode, the other end of the third resonant capacitor and the cathode of the diode are connected with the positive end of an output capacitor, and the different-name end of the secondary side of the transformer is connected with the negative end of an output filter capacitor.

Description

Low switch tube voltage stress voltage type output resonant converter
Technical Field
The invention relates to a resonant converter technology, in particular to a low-switching-tube voltage stress voltage type output resonant converter.
Background
As power converters become more stringent in terms of weight and volume design, soft switching technology becomes a desirable choice in converter design to increase switching frequency and increase power density. Among all zero-voltage switching converters, the resonant converter has attracted attention because of its advantages of not only realizing soft switching technology, but also absorbing circuit parasitic parameters (such as leakage inductance of a transformer, junction capacitance of a switching tube and a diode, etc.) to reduce the influence of the parasitic parameters on the circuit under high-frequency operation.
A great deal of research has been conducted on zero-voltage switching resonant converters during the development of modern power electronics technology. The quasi-resonant converter can realize zero-voltage switching only through the resonant capacitor connected with the switching tube in parallel. In order to realize the soft switching technology of the diode, a multi-resonant converter based on multi-resonant switching is further proposed. However, the conventional multi-resonant converter still has a problem of high voltage stress of the switching tube.
Disclosure of Invention
The invention aims to provide a low-switching tube voltage stress voltage 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 voltage 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 diode, a third resonant capacitor 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, the drain electrode of a switching tube, one end of a first resonant capacitor and one end of a second resonant inductor, 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 dotted terminal of the secondary side of the transformer is connected with one end of a third resonant capacitor and the anode of a diode, the other end of the third resonant capacitor and the cathode of the diode are connected with the positive terminal of an output capacitor, and the dotted terminal of the secondary side of the transformer is connected with the negative terminal of an output filter 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-isolated voltage 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 first resonant capacitor, a second resonant inductor, a second resonant capacitor, a diode, a third resonant capacitor and an output filter capacitor; one end of the first resonance inductor is connected with the positive end of the direct-current power supply, the other end of the first resonance inductor is connected with one end of the energy storage inductor, the anode of the diode, one end of the third resonance capacitor is connected, the other end of the third resonance capacitor, the cathode of the diode is connected with the positive end of the output filter capacitor, the other end of the energy storage inductor, the drain electrode of the switch tube, one end of the first resonance capacitor, one end of the second resonance inductor is connected with the negative end of the output filter capacitor, the other end of the second resonance inductor is connected with one end of the second resonance capacitor, the other end of the first resonance capacitor, and the source electrode of the switch tube is connected with the negative end of the direct.
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) the low-switching-tube voltage stress voltage 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 type output resonant converter can reduce the voltage stress of the switching tube, has smaller conduction loss and higher efficiency; (2) the invention relates to a low switch tube voltage stress voltage type output resonant converter, which comprises a low switch tube voltage stress non-isolated voltage type output resonant converter and a low switch tube voltage stress isolated voltage type output resonant converter, wherein the low switch tube voltage stress isolated voltage type output resonant converter can be selected in the application occasions needing electrical isolation, and the low switch tube voltage stress non-isolated voltage type output resonant converter can be selected in the application occasions needing no electrical isolation; (3) 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; (4) the low-switching-tube voltage stress voltage 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; (5) the output rectifying circuit of the low-switching-tube voltage stress voltage type output resonant converter only comprises a diode, a third resonant capacitor and an output filter capacitor, and has the advantage of simple structure.
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 voltage type output resonant converter.
Fig. 2 is a schematic circuit diagram of a non-isolated voltage type output resonant converter with low switching tube voltage stress.
Fig. 3 is a schematic diagram of an equivalent circuit structure of the present invention.
Fig. 4 is a schematic diagram of main waveforms of the low switching tube voltage stress isolation type voltage type output resonant converter in the first working mode.
Fig. 5 is a schematic diagram of an equivalent circuit structure of the switching mode 1 in the first operating mode and the switching modes 1 and 3 in the second operating 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 operation 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 voltage type 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) switching tube S, parasitic body diode of switching tubePipe DsFirst resonant capacitor CsSecond resonant capacitor CrSecond resonant inductor LrIsolation transformer TrDiode D, third resonant capacitor CdOutput filter capacitor CoOutput 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 voltage type output resonant converter, 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 third resonant capacitor CdAn 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 LsAnd the other end of (1) and an excitation inductance LmOne end of (1), transformer TrThe same-name ends of the primary side are connected, and an excitation inductor LmAnd the other end of 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 TrThe dotted terminal of the secondary side and the third resonant capacitor CdIs connected with the anode of the diode D, and a third resonant capacitor CdAnother terminal of the diode D, a cathode of the diode D and an output capacitor CoIs connected with the positive end of the transformer TrSecondary different name end and output filter 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 CdIncluding the junction capacitance of the diode D itself and the additional capacitance connected in parallel across the diode D.
Referring to FIG. 2, the non-isolated voltage type output resonant converter with low switching tube voltage stress, and the 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 third resonant capacitor CdAn 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 LsThe other end and an energy storage inductor LmOne end of (1), the anode of the diode D, and a third resonant capacitor CdIs connected to a third resonant capacitor CdThe other end of the diode D, the cathode of the diode D and the output filter capacitor CoIs connected with the positive end of the 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 to the negative terminal of the second resonant inductor LrAnd the other end of the first resonant capacitor CrIs connected to one end of a second resonant capacitor CrAnother terminal of (1), a first resonance capacitor CsThe 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 voltage type output resonant converter in fig. 2 is similar to the low switching tube voltage stress isolated voltage type output resonant converter in fig. 1 in working principle, except that the low switching tube voltage stress isolated voltage type 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 voltage type output resonant converter can be selected in the application occasions needing electrical isolation, and the low-switching tube voltage stress non-isolation type voltage type 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 in the primary circuit 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 voltage 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) the excitation inductance is large enough to be approximately regarded as a current source Io-Iin，IoTo output current, IinIs the input current; (3) the output filter capacitor is large enough to be approximately considered as a voltage source Vo，VoIs the output voltage; (4) 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 off state, t0At time, the first resonant inductor current iLTo achieve Iin-IoAt this time, the third resonant capacitor CdThe current starts to flow, the diode D is turned off with zero current, and the third resonant capacitor CdParticipating in resonance, third harmonicVibration capacitor CdA voltage across the diode (i.e. a voltage v across the diode)d) The resonance rises. First resonant inductor L in the switching modesA first resonant capacitor CsA second resonant inductor LrA second resonant capacitor CrA third resonant capacitor CdParticipate in resonance.
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 the off state, t1At the moment, the first resonant capacitor CsTwo terminal voltage (i.e. drain-source voltage v of switch tube)s) When the resonance reaches 0, the switch tube S is switched on at zero voltage, and the first resonance capacitor C is switched on at the momentsOut of resonance, first resonant inductance LsA second resonant inductor LrA second resonant capacitor CrA third resonant capacitor CdParticipate in resonance, wherein the second resonance inductance LrA second resonant capacitor CrSeries resonance occurs inside, and the external voltage is zero.
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 the on state, t3Time of day, resonant capacitance CdVoltage v acrossdResonating to 0, diode D conducts. The current of the inductor changes linearly at the stage with a rate of change of
Figure BDA0001814796890000051
Second resonant inductor L under the switching moderA second resonant capacitor CrSeries resonance occurs inside, and the external voltage is zero.
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 a conducting state, t3At the moment, the switch tube S is turned off and the resonant capacitor CsVoltage v acrosssResonance rise, first resonance inductance L in this modesA first resonant capacitor CsA second resonant inductor LrA second resonant capacitor CrParticipate in resonance. t is t4At that moment, the diode D turns off, returning to the switching mode 1.
Example two
Different from the working mode 1, the working mode 2 has a state that the second diode D is turned off without conducting the switching tube S, and a main waveform diagram thereof is shown in fig. 9. From fig. 8, 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. 5, the switching tube S is in the off state, t0Time of day, inductor current iLTo achieve Iin-IoThird resonant capacitor CdThe current starts to flow, the diode D is turned off with zero current, and the third resonant capacitor CdVoltage v acrossdResonant rise, first resonant inductance LsA second resonant inductor LrA first resonant capacitor CsA second resonant capacitor CrAnd a third resonant capacitor CdParticipate in resonance.
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 the off state, t1At the moment, the first resonant capacitor CsTwo-terminal voltage (i.e. voltage v at two terminals of S drain and source of switch tube)s) When the resonance reaches 0, the switch tube S is switched on at zero voltage, and the second resonance capacitor C is switched on at the momentsOut of resonance, first resonant inductance LsA second resonant inductor LrA second resonant capacitor CrA third resonant capacitor CdParticipating in resonance, second resonant inductance LrA second resonant capacitor CrSeries resonance occurs inside, and the voltage is zero.
3. Switching mode 3[ t ]2，t3]
The equivalent circuit of the switching mode is shown in FIG. 5, in which the diode D is in the off state，t2At the moment, the switch tube S is turned off, and the first resonant capacitor CsVoltage v acrosssThe resonance rises, at which time the first resonance capacitor CsA 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 decline continues.
4. Switch mode 4[ t ]3，t4]
The equivalent circuit of the switching mode is shown in fig. 8, where the switching tube S is in an off state, t3Time of day, CdVoltage v acrossdResonant to 0, diode D is conducted, and first resonant inductor LsA second resonant inductor LrA second resonant capacitor CrParticipating in resonance; t is t4At that moment, the diode D turns off, returning to the switching mode 1.

Claims (6)

1. A low switch tube voltage stress isolation type voltage 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 diode (D) and a third resonant capacitor (C)d) 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 air inlet pipe is connected with the air outlet pipe,
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, switch tube (S) drain electrode, first resonance capacitor (C)s) One terminal of (1), the second resonant inductor (L)r) One end of the two ends of the connecting rod is connected,
second resonant inductance (L)r) And the other end of the first resonant capacitor (C) and a second resonant capacitor (C)r) One end of the first and second connecting rods is connected,
source electrode of switch tube (S) and 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) The dotted terminal of the secondary side and the third resonant capacitor (C)d) One end of the diode (D) is connected with the anode of the diode (D),
third resonant capacitor (C)d) Another terminal of the diode (D), a cathode of the diode (D) and an output capacitor (C)o) The positive end of the first and second connecting rods is connected,
transformer (T)r) Secondary different name end and output filter 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) The anode is connected with the source of the switch tube (S), and the parasitic body diode (D)s) The cathode is connected with 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 voltage type output resonant converter with low switching tube voltage stress is characterized by comprisingDC 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 diode (D), a third resonant capacitor (C)d) 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) Another end of (D) and an energy storage inductor (L)m) One terminal of (C), a third resonant capacitor (C)d) One end of the diode (D) is connected with the anode of the diode (D),
third resonant capacitor (C)d) The other end of the diode (D) and the cathode of the diode (D), and an output filter capacitor (C)o) The positive end of the first and second connecting rods is connected,
energy storage inductor (L)m) The other end of the first resonant capacitor (C), the drain electrode of the switching tube (S) and the first resonant capacitor (C)s) One terminal of (1), the second resonant inductor (L)r) And an output filter capacitor (C)o) The negative end of the first power supply is connected with the negative end of the second power supply,
second resonant inductance (L)r) And the other end of the first resonant capacitor (C) and a second resonant capacitor (C)r) One end of the two ends of the connecting rod is connected,
source electrode of switch tube (S) and 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. A 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) The anode is connected with the source of the switch tube (S), and the parasitic body diode (D)s) The cathode is connected with 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 capacitance of the junction of the switch tube (S) and the capacitance connected in parallel with the source and drain of the switch tube (S)The sum of the capacities of the resonant capacitors;
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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