CN113612394A - Topology switching method and device of full-bridge CLLC resonant converter - Google Patents
Topology switching method and device of full-bridge CLLC resonant converter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
- 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
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- 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 discloses a topology switching method and a topology switching device for a full-bridge CLLC resonant converter, wherein the method for switching the half-bridge topology to the full-bridge topology comprises the following steps: if the current output voltage is lower than the highest output voltage of the half-bridge topology, the converter keeps the half-bridge topology unchanged; and if the required output voltage is higher than the highest output voltage of the half-bridge topology, entering a process of switching the half-bridge topology to the full-bridge topology. The method for switching from the full-bridge topology to the half-bridge topology comprises the following steps: if the current output voltage is higher than the lowest output voltage of the full-bridge topology, the converter keeps the full-bridge topology unchanged; and if the required output voltage is lower than the lowest output voltage of the full-bridge topology, entering a process of switching the full-bridge topology to the half-bridge topology. The invention can switch the full-bridge converter between the full-bridge topology and the half-bridge topology without adding additional devices to change the equivalent input voltage of the resonant cavity, thereby greatly changing the output gain of the converter, widening the output voltage range, and having smooth switching process and no oscillation.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a topology switching method and device of a full-bridge CLLC resonant converter.
Background
With the continuous development of the technical industries such as electric vehicles, distributed power supplies, aviation power systems, Uninterruptible Power Supplies (UPS), and the like, a bidirectional DC/DC converter (BDC) becomes a research hotspot in the power electronics and industry at present. These applications require that BDC be able to achieve a wide range of voltage regulation over a wide load range while having as much higher power density and lower electromagnetic interference as possible based on high efficiency operation.
In general, BDCs can be classified into isolated and non-isolated types. On one hand, the isolated BDC can reduce the volume and the weight thereof through a high-frequency transformer, thereby improving the flexibility of application and control; on the other hand, since BDC is usually used to connect two dc buses, electrical isolation may improve its stability and safety. Therefore, the isolated BDC more easily meets the technical requirements for industrial applications than the non-isolated BDC.
In the isolation BDC, the LLC resonant DC/DC converter has been widely studied for its advantage of soft switching characteristic, but when it operates in reverse, since the excitation inductor is clamped by the input voltage, the resonant cavity becomes a series resonant circuit composed of the resonant inductor and the capacitor, so that the LLC resonant converter has substantially no boost characteristic when it operates in reverse, and its advantage of soft switching may be lost when it operates in reverse. To overcome this drawback, researchers have proposed a CLLC type resonant converter, as shown in fig. 1. The CLLC structure is developed on the basis of the LLC structure, and by adding the resonance capacitor on the secondary side of the transformer, on one hand, bidirectional blocking can be realized, and the problem of bias saturation of the transformer due to asymmetric voltage square waves is avoided; on the other hand, compared with the LLC circuit, the secondary side capacitor is used as a non-negligible factor to participate in the resonance process, so that the circuit has reverse voltage boosting and reducing capacity, and the design of a wide-range output application occasion is facilitated to be simplified.
With the continuous development of the application field of the CLLC converter, the requirements on the input and output voltage ranges of the converter are higher and higher. Conventional converter architectures and control methods often suffer from power density, efficiency, etc. in achieving these goals.
Disclosure of Invention
The invention provides a topology switching method and a topology switching device of a full-bridge CLLC resonant converter, which can solve or at least partially solve the technical problems.
Therefore, the invention adopts the following technical scheme:
in a first aspect, a topology switching method of a full-bridge CLLC resonant converter is provided, which includes a method of switching a half-bridge topology to a full-bridge topology and a method of switching the full-bridge topology to the half-bridge topology;
the method for switching the half-bridge topology to the full-bridge topology comprises the following steps:
if the current output voltage is lower than the highest output voltage of the half-bridge topology, the converter keeps the half-bridge topology unchanged, and the converter performs frequency modulation control on the half-bridge topology;
if the required output voltage is higher than the highest output voltage of the half-bridge topology, entering a process of switching the half-bridge topology to the full-bridge topology, continuously performing frequency modulation control on the leading bridge arm switch tube, and performing voltage boosting and width modulation control on the lagging bridge arm switch tube;
when the topology switching is finished and the full-bridge topology is entered, the converter performs frequency modulation control on the full-bridge topology;
the method for switching from the full-bridge topology to the half-bridge topology comprises the following steps:
if the current output voltage is higher than the lowest output voltage of the full-bridge topology, the converter keeps the full-bridge topology unchanged, and the converter performs frequency modulation control on the full-bridge topology;
if the required output voltage is lower than the lowest output voltage of the full-bridge topology, entering a process of switching the full-bridge topology to the half-bridge topology, leading the bridge arm switch tube to continue frequency modulation control, and lagging the bridge arm switch tube to perform voltage reduction and width modulation control;
and when the topology switching is completed and the half-bridge topology is entered, the converter performs frequency modulation control on the half-bridge topology.
Optionally, in the frequency modulation control of the converter in a half-bridge topology, the driving signals of the two leading bridge arm switching tubes are complementary symmetric signals with a 50% duty ratio; one of the two hysteresis bridge arm switch tubes is kept in a normally open state, and the other of the two hysteresis bridge arm switch tubes is kept in a normally closed state.
Optionally, in the step-up and width-modulation control of the lag bridge arm switching tube, the frequencies of the lag bridge arm switching tube and the lead bridge arm switching tube are the same.
Optionally, in the step-up and width-modulation control of the hysteresis bridge arm switching tubes, the duty ratio of one of the two hysteresis bridge arm switching tubes gradually increases to 50%, and the duty ratio of the other of the two hysteresis bridge arm switching tubes gradually decreases to 50%.
Optionally, in the frequency modulation control of the converter in the full-bridge topology, the driving signals of the two lagging bridge arm switching tubes are complementary symmetric signals with a 50% duty ratio.
Optionally, in the step-down width-modulation control of the lag bridge arm switching tube, the frequencies of the lag bridge arm switching tube and the lead bridge arm switching tube are the same.
Optionally, in the step-down width-adjusting control of the hysteresis bridge arm switching tubes, the duty ratio of one of the two hysteresis bridge arm switching tubes gradually decreases to 0 to reach a normally open state, and the duty ratio of the other of the two hysteresis bridge arm switching tubes gradually increases to 100% to reach a normally closed state.
In a second aspect, a topology switching apparatus of a full-bridge CLLC resonant converter is provided, which includes a first switching module for switching a half-bridge topology to a full-bridge topology and a second switching module for switching the full-bridge topology to the half-bridge topology;
the first switching module includes:
the first half-bridge frequency modulation unit is used for keeping the half-bridge topology unchanged by the converter and carrying out frequency modulation control on the half-bridge topology if the current output voltage is lower than the highest output voltage of the half-bridge topology;
the first switching unit is used for entering the process of switching the half-bridge topology to the full-bridge topology if the required output voltage is higher than the highest output voltage of the half-bridge topology, leading the bridge arm switch tube to continue frequency modulation control, and lagging the bridge arm switch tube to perform boost width modulation control;
the first full-bridge frequency modulation unit is used for carrying out frequency modulation control on the full-bridge topology by the converter when the topology switching is finished and the full-bridge topology enters the full-bridge topology;
the second switching module includes:
the second full-bridge frequency modulation unit is used for keeping the full-bridge topology unchanged by the converter and performing frequency modulation control on the full-bridge topology if the current output voltage is higher than the lowest output voltage of the full-bridge topology;
the second switching unit is used for entering the process of switching the full-bridge topology to the half-bridge topology if the required output voltage is lower than the lowest output voltage of the full-bridge topology, leading the bridge arm switch tube to continue frequency modulation control, and lagging the bridge arm switch tube to perform voltage reduction and width modulation control;
and the second half-bridge frequency modulation unit is used for carrying out frequency modulation control on the half-bridge topology by the converter when topology switching is completed and the converter enters the half-bridge topology.
Optionally, in the frequency modulation control of the converter in a half-bridge topology, the driving signals of the two leading bridge arm switching tubes are complementary symmetric signals with a 50% duty ratio; one of the two hysteresis bridge arm switch tubes is kept in a normally open state, and the other of the two hysteresis bridge arm switch tubes is kept in a normally closed state.
Optionally, in the frequency modulation control of the converter in a full-bridge topology, the driving signals of the two leading bridge arm switching tubes are complementary symmetric signals with 50% duty ratio; the driving signals of the two lagging bridge arm switching tubes are complementary symmetrical signals with 50% duty ratio; the frequency of the lag bridge arm switching tube is the same as that of the lead bridge arm switching tube.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the topology switching method and device of the full-bridge CLLC resonant converter, provided by the embodiment of the invention, the full-bridge converter is switched between the full-bridge topology and the half-bridge topology without adding an additional device, so that the equivalent input voltage of the resonant cavity is changed, the output gain of the converter is greatly changed, the output voltage range is widened, the switching process is smooth, and no oscillation occurs.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope covered by the contents disclosed in the present invention.
Fig. 1 is a topology diagram of a full-bridge CLLC resonant converter according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for switching topology of a full-bridge CLLC resonant converter according to an embodiment of the present invention;
FIG. 3 is a process diagram of the driving regulation of the switching tube according to the embodiment of the present invention;
fig. 4 is a waveform diagram of the resonant cavity current and the output voltage during the topology switching process according to the embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A typical topology of a full bridge CLLC resonant converter is shown in fig. 1. The input side and the output side of the circuit comprise 8 switching tubes; the primary side comprises a resonant inductor Lr and a resonant capacitor Cr 1; the excitation inductance Lm of the isolation transformer has the turn ratio of n to 1; a resonant capacitor Cr2 is added to the secondary side of the transformer. When the circuit works in a forward working state, primary sides Sp 1-Sp 4 are main switching tubes, Sp1 and Sp4 signals are synchronous, Sp2 and Sp3 signals are synchronous, the same bridge arm switching tubes work in a complementary and symmetrical mode through driving signals with 50% duty ratio, and when synchronous rectification is not implemented on the secondary sides, driving signals Ss 1-Ss 4 are turned off, the switching tubes are turned off, and the anti-parallel diodes are subjected to uncontrolled rectification. When the circuit works in a reverse state, secondary sides Ss 1-Ss 4 are main switching tubes, primary sides Sp 1-Sp 4 work in an anti-parallel connection mode, and a control method can be similar to a forward direction. The CLLC resonant converter is similar to the LLC resonant converter in output principle and method, and adjusts the output voltage Vo by changing the gain of the switching frequency control circuit.
As shown in fig. 2, the present embodiment provides a topology switching method of a full-bridge CLLC resonant converter, which includes a method of switching a half-bridge topology to a full-bridge topology and a method of switching a full-bridge topology to a half-bridge topology.
Specifically, the method for switching from the half-bridge topology to the full-bridge topology comprises the following steps:
s1, if the current output voltage is lower than the highest output voltage of the half-bridge topology, the converter keeps the half-bridge topology unchanged, and the converter performs frequency modulation control on the half-bridge topology; specifically, the present output voltage is sampled to determine the magnitude relationship between the present output voltage and the highest output voltage of the half-bridge topology.
Optionally, in the frequency modulation control of the converter in a half-bridge topology, the driving signals of the two leading-arm switching tubes (such as Sp1 and Sp2 in fig. 1) are complementary symmetric signals with 50% duty ratio; one of the two hysteresis bridge arm switch tubes (such as Sp3 in FIG. 1) is kept in a normally open state, and the other (such as Sp4 in FIG. 1) is kept in a normally closed state.
And S2, if the required output voltage is higher than the highest output voltage of the half-bridge topology, entering a process of switching the half-bridge topology to the full-bridge topology, and continuing performing frequency modulation control on the leading bridge arm switch tube and performing voltage boosting and width modulation control on the lagging bridge arm switch tube.
In this step, the frequencies of the lag bridge arm switching tube and the lead bridge arm switching tube are the same.
In this embodiment, the process of the driving adjustment of the switching tube is shown in fig. 3. In this process, the duty ratio of the driving signal Sp3 gradually increases from 0 (i.e., in a normally-on state), and the duty ratio of the driving signal Sp4 gradually decreases from 100% (i.e., in a normally-off state). Fig. 4 is a waveform of the resonator current and output voltage during topology switching. It can be seen that in the process of topology switching, the output voltage gradually rises, and the resonant cavity current is smooth without impact.
And S3, when the topology switching is completed and the full-bridge topology is entered, the converter performs frequency modulation control on the full-bridge topology.
Specifically, the duty ratio of one of the two hysteresis bridge arm switching tubes is increased to 50%, and the duty ratio of the other switching tube is decreased to 50%, at this time, the converter enters a full-bridge topology. Then, the converter continues to perform frequency modulation control, and when the frequency modulation control of the full-bridge topology is performed, the driving signals of the two lagging bridge arm switching tubes are complementary symmetric signals with 50% duty ratio.
Further, the method for switching from the full-bridge topology to the half-bridge topology comprises:
and S4, if the current output voltage is higher than the lowest output voltage of the full-bridge topology, keeping the full-bridge topology unchanged by the converter, and performing frequency modulation control on the full-bridge topology by the converter. Optionally, when the converter performs frequency modulation control of a full-bridge topology, the driving signals of the leading arm switching tubes Sp1 and Sp2 and the driving signals of the lagging arms Sp3 and Sp4 are complementary symmetric signals with a 50% duty ratio.
S5, if the required output voltage is lower than the lowest output voltage of the full-bridge topology, entering a process of switching the full-bridge topology to the half-bridge topology, leading the bridge arm switch tube to continue frequency modulation control, and lagging the bridge arm switch tube to perform voltage reduction and width modulation control; and in the step-down and width-adjusting control of the lag bridge arm switching tube, the frequency of the lag bridge arm switching tube is the same as that of the lead bridge arm switching tube.
When the lagging bridge arm switching tubes are used for carrying out voltage reduction and width adjustment control, the duty ratio of one (Sp3) of the two lagging bridge arm switching tubes is gradually reduced to 0 to reach a normally open state, and the duty ratio of the other (Sp4) is gradually increased to 100% to reach a normally closed state.
S6, when the topology switching is completed and the inverter enters the half-bridge topology, the inverter performs the frequency modulation control of the half-bridge topology, which can be understood as returning to step S1.
The embodiment also provides a topology switching device of a full-bridge CLLC resonant converter, which is used for realizing the topology switching method, and comprises a first switching module used for switching a half-bridge topology to a full-bridge topology and a second switching module used for switching the full-bridge topology to the half-bridge topology.
The first switching module includes:
the first half-bridge frequency modulation unit is used for keeping the half-bridge topology unchanged by the converter and carrying out frequency modulation control on the half-bridge topology if the current output voltage is lower than the highest output voltage of the half-bridge topology;
the first switching unit is used for entering the process of switching the half-bridge topology to the full-bridge topology if the required output voltage is higher than the highest output voltage of the half-bridge topology, leading the bridge arm switch tube to continue frequency modulation control, and lagging the bridge arm switch tube to perform boost width modulation control;
and the first full-bridge frequency modulation unit is used for carrying out frequency modulation control on the full-bridge topology by the converter when the topology switching is finished and the full-bridge topology enters the full-bridge topology.
The second switching module includes:
the second full-bridge frequency modulation unit is used for keeping the full-bridge topology unchanged by the converter and performing frequency modulation control on the full-bridge topology if the current output voltage is higher than the lowest output voltage of the full-bridge topology;
the second switching unit is used for entering the process of switching the full-bridge topology to the half-bridge topology if the required output voltage is lower than the lowest output voltage of the full-bridge topology, leading the bridge arm switch tube to continue frequency modulation control, and lagging the bridge arm switch tube to perform voltage reduction and width modulation control;
and the second half-bridge frequency modulation unit is used for carrying out frequency modulation control on the half-bridge topology by the converter when topology switching is completed and the converter enters the half-bridge topology.
In the working process of the topology switching device of the full-bridge CLLC resonance converter, when the converter performs frequency modulation control on half-bridge topology, the driving signals of the two leading bridge arm switching tubes are complementary symmetric signals with 50% duty ratio; one of the two hysteresis bridge arm switch tubes is kept in a normally open state, and the other of the two hysteresis bridge arm switch tubes is kept in a normally closed state.
In the working process of the topology switching device of the full-bridge CLLC resonance converter, when the converter performs frequency modulation control on full-bridge topology, the driving signals of the two leading bridge arm switching tubes are complementary symmetric signals with 50% duty ratio; the driving signals of the two lagging bridge arm switching tubes are complementary symmetrical signals with 50% duty ratio; the frequency of the lag bridge arm switching tube is the same as that of the lead bridge arm switching tube.
Since the working principle of the topology switching has been specifically described in the flow of the topology switching method, it is not described herein again.
According to the topology switching method and device of the full-bridge CLLC resonant converter, the full-bridge converter can be switched between the full-bridge topology and the half-bridge topology without adding an additional device, so that the equivalent input voltage of the resonant cavity is changed, the output gain of the converter is greatly changed, the output voltage range is widened, the switching process is smooth, and no oscillation occurs.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A topology switching method of a full-bridge CLLC resonant converter is characterized by comprising a method for switching a half-bridge topology to a full-bridge topology and a method for switching the full-bridge topology to the half-bridge topology;
the method for switching the half-bridge topology to the full-bridge topology comprises the following steps:
if the current output voltage is lower than the highest output voltage of the half-bridge topology, the converter keeps the half-bridge topology unchanged, and the converter performs frequency modulation control on the half-bridge topology;
if the required output voltage is higher than the highest output voltage of the half-bridge topology, entering a process of switching the half-bridge topology to the full-bridge topology, continuously performing frequency modulation control on the leading bridge arm switch tube, and performing voltage boosting and width modulation control on the lagging bridge arm switch tube;
when the topology switching is finished and the full-bridge topology is entered, the converter performs frequency modulation control on the full-bridge topology;
the method for switching from the full-bridge topology to the half-bridge topology comprises the following steps:
if the current output voltage is higher than the lowest output voltage of the full-bridge topology, the converter keeps the full-bridge topology unchanged, and the converter performs frequency modulation control on the full-bridge topology;
if the required output voltage is lower than the lowest output voltage of the full-bridge topology, entering a process of switching the full-bridge topology to the half-bridge topology, leading the bridge arm switch tube to continue frequency modulation control, and lagging the bridge arm switch tube to perform voltage reduction and width modulation control;
and when the topology switching is completed and the half-bridge topology is entered, the converter performs frequency modulation control on the half-bridge topology.
2. The topology switching method of the full-bridge CLLC resonant converter according to claim 1, wherein in the frequency modulation control of the half-bridge topology, the driving signals of the two leading bridge arm switching tubes are complementary symmetric signals with 50% duty ratio; one of the two hysteresis bridge arm switch tubes is kept in a normally open state, and the other of the two hysteresis bridge arm switch tubes is kept in a normally closed state.
3. The topology switching method of a full-bridge CLLC resonant converter according to claim 2, wherein the frequencies of the lag bridge arm switching tubes and the lead bridge arm switching tubes are the same during the boost width modulation control of the lag bridge arm switching tubes.
4. The topology switching method of a full-bridge CLLC resonant converter according to claim 3, wherein in the step-up and width-modulation control of the hysteretic bridge arm switching tubes, the duty ratio of one of the two hysteretic bridge arm switching tubes gradually increases to 50%, and the duty ratio of the other one gradually decreases to 50%.
5. The topology switching method of the full-bridge CLLC resonant converter according to claim 1 or 4, wherein in the frequency modulation control of the full-bridge topology, the driving signals of the two lagging bridge arm switching tubes are complementary symmetric signals with 50% duty ratio.
6. The topology switching method of a full-bridge CLLC resonant converter according to claim 1, wherein said lag bridge arm switching tube has the same frequency as said lead bridge arm switching tube in step-down width-modulation control.
7. The topology switching method of the full-bridge CLLC resonant converter according to claim 6, wherein during the step-down and width-modulation control of the hysteretic bridge arm switching tubes, the duty ratio of one of the two hysteretic bridge arm switching tubes gradually decreases to 0 to reach a normally open state, and the duty ratio of the other of the two hysteretic bridge arm switching tubes gradually increases to 100% to reach a normally closed state.
8. A topology switching device of a full-bridge CLLC resonance converter is characterized by comprising a first switching module for switching a half-bridge topology to a full-bridge topology and a second switching module for switching the full-bridge topology to the half-bridge topology;
the first switching module includes:
the first half-bridge frequency modulation unit is used for keeping the half-bridge topology unchanged by the converter and carrying out frequency modulation control on the half-bridge topology if the current output voltage is lower than the highest output voltage of the half-bridge topology;
the first switching unit is used for entering the process of switching the half-bridge topology to the full-bridge topology if the required output voltage is higher than the highest output voltage of the half-bridge topology, leading the bridge arm switch tube to continue frequency modulation control, and lagging the bridge arm switch tube to perform boost width modulation control;
the first full-bridge frequency modulation unit is used for carrying out frequency modulation control on the full-bridge topology by the converter when the topology switching is finished and the full-bridge topology enters the full-bridge topology;
the second switching module includes:
the second full-bridge frequency modulation unit is used for keeping the full-bridge topology unchanged by the converter and performing frequency modulation control on the full-bridge topology if the current output voltage is higher than the lowest output voltage of the full-bridge topology;
the second switching unit is used for entering the process of switching the full-bridge topology to the half-bridge topology if the required output voltage is lower than the lowest output voltage of the full-bridge topology, leading the bridge arm switch tube to continue frequency modulation control, and lagging the bridge arm switch tube to perform voltage reduction and width modulation control;
and the second half-bridge frequency modulation unit is used for carrying out frequency modulation control on the half-bridge topology by the converter when topology switching is completed and the converter enters the half-bridge topology.
9. The topology switching device of a full-bridge CLLC resonant converter according to claim 8, wherein in the frequency modulation control of the converter in the half-bridge topology, the driving signals of the two leading bridge arm switching tubes are complementary symmetric signals with 50% duty ratio; one of the two hysteresis bridge arm switch tubes is kept in a normally open state, and the other of the two hysteresis bridge arm switch tubes is kept in a normally closed state.
10. The topology switching device of a full-bridge CLLC resonant converter according to claim 8, wherein in the frequency modulation control of the full-bridge topology, the driving signals of the two leading bridge arm switching tubes are complementary symmetric signals with 50% duty ratio; the driving signals of the two lagging bridge arm switching tubes are complementary symmetrical signals with 50% duty ratio; the frequency of the lag bridge arm switching tube is the same as that of the lead bridge arm switching tube.
Priority Applications (1)
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